JP4092569B2 - Evaporative combustion device - Google Patents

Description

  The present invention relates to a vaporization type combustion apparatus using liquid fuel.

  In water heaters, heaters, and the like, a vaporization type combustion apparatus that uses inexpensive liquid fuel such as kerosene is frequently used to reduce running costs. Among these, when used in applications where the amount of heat generated is relatively small, a type in which liquid fuel is vaporized by the vaporization unit and the vaporized fuel gas is sent to the combustion unit for combustion is often used.

FIG. 16 is a cross-sectional view showing an example of a vaporization unit employed in a conventional vaporization combustion apparatus.
In this example, the vaporization unit 500 is provided at the center of the combustion unit 501. The vaporizing unit 500 has a configuration in which a rotating member 504 is rotatably accommodated in a bottomed cylindrical vaporizing chamber 502. An electric heater 503 is built in the bottom of the vaporizing chamber 502, and the inner wall of the vaporizing chamber 502 can be heated. The rotating member 504 is a member in which the periphery of the disk is cut and raised to form a stirring blade, is fixed to the rotating shaft 505, and is rotated at a high speed by a motor (not shown). A fuel pipe 506 is fixed to the upper part of the rotating member 504.

  Then, the electric heater 503 is energized to heat the vaporizing chamber 502, the rotating member 504 is rotated by a motor (not shown), and the fuel pipe 506 is supplied while supplying air from the primary air introduction cylinder 507 to the inside of the vaporizing chamber 502. Kerosene is jetted from the rotary member 504 to the rotary member 504. Then, the kerosene injected to the rotating member 504 is scattered toward the inner wall of the vaporizing chamber 502 by centrifugal force, is vaporized by receiving heat from the heated inner wall of the vaporizing chamber 502, and the vaporized fuel is a primary air introduction cylinder. The air is mixed with the air supplied from 507 into the vaporizing chamber 502. And this mixed gas is sent to the combustion part 501 from the upper opening 508, and is used for combustion. That is, in this kind of vaporization type combustion apparatus, thermal energy is given and vaporized while scattering liquid fuel.

  However, in the conventional vaporization type combustion apparatus provided with the vaporization unit 500 shown in FIG. 16, it takes time for the electric heater 503 to raise the temperature of the vaporization chamber 502 to a temperature at which liquid fuel can be vaporized. For this reason, in a hot water supply apparatus or the like incorporating such a vaporization type combustion apparatus, fuel gas is not generated until the temperature of the vaporization chamber 502 is raised, and combustion is not started until then, so that unheated hot water is wasted. It was unusable just by being discharged.

  Therefore, the applicant of the present application made a prototype of a vaporization type combustion apparatus that raises the temperature of the vaporization section in a short time using an electromagnetic induction heating method. Such a combustion apparatus adopting the electromagnetic induction heating method has a configuration including a first heat generating portion heated by electromagnetic induction and a second heat generating portion heated by a flame caused by combustion. . In other words, at the beginning of the combustion operation, the first heat generating part is heated by electromagnetic induction heating in a short time to vaporize the liquid fuel, and then the temperature of the second heat generating part is increased by the flame. The heating of the unit is stopped, and the liquid fuel is vaporized by the second heat generating unit. Thereby, at the initial stage of combustion, liquid fuel is vaporized in a short time by the first heat generating unit to start combustion, and thereafter, the vaporization is continued by the second heat generating unit to energize the electromagnetic induction heating means. The running cost associated with is reduced.

However, in the vaporization type combustion apparatus adopting the electromagnetic induction method described above, when the vaporization of the liquid fuel is switched from the first heat generating part to the second heat generating part at the start of combustion or at the time of resuming combustion, the vaporization state becomes transient. Fluctuated periodically, causing a problem that the flame was temporarily unstable.
Further, when the amount of combustion increases during combustion by vaporizing the liquid fuel by the second heat generating part, the temperature of the second heat generating part is lowered by heat absorption accompanying the vaporization. In order to compensate for this temperature drop, control is performed to temporarily heat the first heat generating portion when the combustion amount increases. However, with the heating of the first heat generating part, there is a problem that the vaporization of the liquid fuel temporarily becomes excessive and soot and a strange odor are generated.

  The present invention is proposed in view of the above circumstances, and provides a vaporization type combustion apparatus with improved combustion stability by maintaining stable vaporization even when transitioning to vaporization or when the amount of combustion varies. It is an object.

The invention according to claim 1, which is proposed to achieve the above object, includes a vaporization unit that heats and vaporizes the liquid fuel , and a blowing unit that supplies air, and the air supplied from the blowing unit ; by mixing a fuel gas vaporized by the vaporizer is supplied to the combustion unit, the evaporative combustion device for burning, the vaporizing unit generates heat by electromagnetic induction heating means, and the induction heating unit the liquid fuel is supplied A self-heating unit that is located downstream of the induction heating unit and that is provided with an opening on the induction heating unit side and that mainly raises the temperature by receiving heat from the combustion unit; and an induction heating unit that is disposed in the self-heating unit. A rotating member that stirs and mixes the liquid fuel supplied through the self-heating portion, an induction heating portion temperature detecting means that detects the temperature of the induction heating portion, and a temperature of the self-heating portion. Self-heating part temperature to detect A knowledge unit, wherein and a control means for controlling each unit including control of the electromagnetic induction heating means, the control means, vaporized by the induction heating unit alone, or from the induction heating unit and vaporized by the self-heating section both The energization control is continued while reducing the energization power of the electromagnetic induction heating means according to the temperature rise of the self-heating unit, the liquid fuel is vaporized in both the induction heating unit and the self-heating unit, and combustion is performed in the combustion unit . It is set as the structure provided with the vaporization transfer mode which transfers to the vaporization by the said self-heating part independently with the temperature rise of the said self-heating part.
The invention described in claim 2 includes a vaporization unit that heats and vaporizes the liquid fuel, and a blowing unit that supplies air. The air supplied from the blowing unit and the fuel gas vaporized in the vaporization unit In the vaporization type combustion apparatus for mixing and supplying to the combustion section and combusting, the vaporization section is located downstream of the induction heating section that generates heat by electromagnetic induction heating means and the induction heating section, and mainly heat of the combustion section. A self-heating unit that rises in response to temperature, an induction heating unit temperature detection unit that detects the temperature of the induction heating unit, a self-heating unit temperature detection unit that detects the temperature of the self-heating unit, and the electromagnetic induction heating unit Control means for controlling each part including the control of the above, a part of the air supplied from the blower means is supplied to the flow path passing through the induction heating part and enters the self-heating part, from the blower means The other one of the supplied air Is supplied to the self-heating unit without passing through the induction heating unit, and the control means increases the temperature of the self-heating unit from vaporization by the induction heating unit alone or vaporization by both the induction heating unit and the self-heating unit. In response to this, the energization control is continued while reducing the energization power of the electromagnetic induction heating means, the liquid fuel is vaporized in both the induction heat generating part and the self-heating part and burned in the combustion part, and the temperature of the self-heating part is increased. Accordingly, it is configured to have a vaporization transition mode for shifting to vaporization by the self-heating unit alone.

  Here, at the time of switching to vaporization by the self-heating unit alone, it is necessary that the temperature of the self-heating unit is raised to a temperature at which the liquid fuel can be vaporized sufficiently. In other words, when shifting to vaporization by the self-heating part alone, heating by the induction heating part is continued until the temperature of the self-heating part rises to a temperature at which the self-heating part can vaporize alone, and when the self-heating part reaches the temperature. The heating by the induction heating unit may be stopped.

  However, when such control is performed, the induction heating unit rapidly cools down from the state of being heated and vaporized in both the induction heating unit and the self-heating unit until the self-heating unit alone vaporizes. Switching suddenly. For this reason, the vaporization state of the fuel gas supplied to the combustion section changes transiently, and the combustion tends to become unstable temporarily.

According to the present invention, during the control period in the vaporization transition mode, vaporization is performed while lowering the temperature of the induction heating unit in accordance with the temperature increase of the self-heating unit. In other words, during the control period in the vaporization transition mode, the vaporization state depending on the heat of the induction heat generation unit is gradually shifted to the vaporization depending on the heat of the self-heating unit. Therefore, when the self-heating part reaches a temperature at which it can be vaporized independently, the heat dependency rate on the induction heating part, that is, the heat generation amount of the induction heating part is reduced.
Therefore, even when the electromagnetic induction heating means is turned off at the end of the control in the vaporization transition mode, the influence on the vaporization state is reduced, and the transient fluctuation of the vaporization state is reduced and stable combustion can be continued. It becomes.

  The control in the vaporization transition mode in the present invention can be suitably employed at the beginning of combustion or at the time of recombustion. That is, it can be suitably employed when the self-heating part is in a state lower than the vaporization temperature. By performing control in the vaporization transition mode at the beginning of combustion or at the time of recombustion, it is possible to smoothly switch to vaporization by the self-heating unit, while suppressing fluctuations in combustion due to switching and energizing the induction heating unit. It is possible to reduce running costs by reducing power

  In the present invention, the reduction control of the electric power supplied to the electromagnetic induction heating means in the vaporization transition mode can take various patterns. For example, it is possible to adopt a control pattern that reduces the energization power to the electromagnetic induction heating means stepwise or continuously in accordance with the temperature rise status of the self-heating unit. In addition, a control pattern that reduces the energized power stepwise until the self-heating part rises to a predetermined temperature and continuously reduces the energizing power after the self-heating part exceeds the predetermined temperature. It is also possible to adopt. Conversely, the control is such that the energized power is continuously reduced until the temperature of the self-heating unit rises to a predetermined temperature, and the energizing power is reduced stepwise after the self-heating unit exceeds the predetermined temperature. It is also possible to take a pattern.

  Also, during the period until the self-heating part rises to the predetermined temperature, the energization power is controlled to slowly reduce the induction heating part toward the predetermined temperature, and after the self-heating part exceeds the predetermined temperature, It is also possible to take a control pattern in which the induction heating unit is rapidly cooled by controlling electric power. Conversely, during the period until the self-heating unit rises to a predetermined temperature, the energization power is controlled to rapidly reduce the induction heating unit to the predetermined temperature, and after the self-heating unit exceeds the predetermined temperature, the energization power It is also possible to take a control pattern in which the temperature of the induction heating unit is slowly lowered by controlling

According to a third aspect of the present invention, in the vaporization type combustion apparatus according to the first or second aspect , the vaporization transition mode has a predetermined lower limit temperature lower than the vaporization temperature of the liquid fuel and a predetermined higher temperature than the vaporization temperature. The control means is configured to control the temperature of the induction heating unit to lower toward the vaporization temperature continuously or stepwise when the vaporization transition mode is started. .

The present invention specifically shows the control of the vaporization transition mode in the combustion apparatus according to claim 1 or 2 .
In the present invention, the lower limit temperature and the upper limit temperature can be appropriately set. For example, the temperature at which a part of the liquid fuel starts to vaporize is set as the lower limit temperature, and the temperature at which the liquid fuel is almost completely vaporized is set as the upper limit temperature. be able to.

  According to the present invention, by setting the lower limit temperature and the upper limit temperature to the above-described temperatures, the heat dependency rate for vaporization can be smoothly transferred from the induction heating unit side to the self heating unit side by the control in the vaporization transition mode. Can do. As a result, when the temperature of the self-heating unit rises to the upper limit temperature, the heat dependency rate for vaporization of the induction heating unit is reduced, and the induction heating unit is suddenly cooled by stopping energization of the electromagnetic induction heating means. However, the effect on the vaporized state is reduced. Moreover, since the self-heating part has reached the upper limit temperature when heating by the induction heating part is stopped, stable vaporization can be continued.

According to a fourth aspect of the present invention, in the vaporization type combustion apparatus according to the third aspect , in the vaporization transition mode, the control means has a self-heating portion that is higher than the vaporization temperature and lower than the upper limit temperature. During the temperature rising period, the induction heating unit is controlled to cool down continuously or stepwise toward the vaporization temperature and held at the vaporization temperature, and the self-heating unit is heated from the first vaporization temperature to the upper limit temperature. In addition, the temperature of the induction heating unit is controlled to be lowered toward the energization stop temperature lower than the lower limit temperature continuously or stepwise.

The present invention more specifically shows the temperature lowering control of the induction heating section in the vaporization transition mode of the combustion apparatus according to claim 3 .
In the present invention, the first vaporization temperature is higher than the vaporization temperature and lower than the upper limit temperature. Therefore, for example, the temperature at which the liquid fuel can be vaporized almost completely can be set as the first vaporization temperature, and the upper limit temperature can be set higher than the first vaporization temperature.

  According to the present invention, by setting the upper limit temperature and the first vaporization temperature as described above, the induction heating unit is lowered to the vaporization temperature and held during the period from the lower limit temperature to the first vaporization temperature. To do. As a result, when the self-heating part reaches the first vaporization temperature, the liquid fuel can be vaporized almost completely, and the heat dependence rate for vaporization of the induction heating part is also reduced. Therefore, even if the vaporization transition mode is terminated at this time, it is possible to suppress the transient fluctuation of the vaporization state.

  However, according to the present invention, the vaporization transition mode is continued until the self-heating unit reaches the upper limit temperature from the first vaporization temperature, and auxiliary heating by the induction heating unit is continued. Thereby, even when the combustion amount increases in the vaporization transition mode, it is possible to prevent the temperature of the self-heating portion from being lowered by the heat of vaporization accompanying the increase in the combustion amount.

  In addition, according to the present invention, when the self-heating unit reaches the upper limit temperature, the induction heating unit cools to an energization stop temperature lower than the lower limit temperature. Therefore, when the self-heating part reaches the upper limit temperature, the heat dependency rate for vaporization of the induction heating part is extremely lowered, and the self-heating part is also a temperature at which the self-heating part can be sufficiently vaporized alone. This eliminates transient fluctuations in the vaporized state, and can smoothly shift to vaporization by the self-heating unit alone while preventing vaporization failure due to an increase in the combustion amount.

According to a fifth aspect of the present invention, in the vaporization type combustion apparatus according to any one of the first to fourth aspects, the control means responds to the temperature of the self-heating portion when the combustion amount increases during combustion. The induction heating unit is energized to control the temperature of the induction heating unit, and the liquid fuel is vaporized and burned in both the induction heating unit and the self heating unit. It is configured to have a vaporization compensation mode for shifting to vaporization of the heat generating unit alone.

As the amount of combustion increases, the amount of liquid fuel supplied increases, heat absorption associated with vaporization increases, and the temperature of the self-heating unit decreases. For this reason, vaporization of the liquid fuel by the self-heating part alone becomes insufficient, and stable combustion is inhibited.
According to the present invention, when the amount of combustion increases, the temperature of the induction heating unit is controlled supplementarily, and vaporization is performed by the heat of both the induction heating unit and the self-heating unit. In other words, the temperature decrease of the self-heating unit accompanying the increase in the combustion amount is compensated by the auxiliary temperature increase of the induction heating unit. As a result, stable vaporization is continued, and then it is possible to return to vaporization of the self-heating part alone as the temperature of the self-heating part rises.

According to a sixth aspect of the present invention, in the vaporization type combustion apparatus according to the fifth aspect , the vaporization compensation mode is such that the self-heating portion is higher than the second vaporization temperature higher than the vaporization temperature of the liquid fuel when the combustion amount varies. The control is executed when the combustion amount after the change is low and exceeds a predetermined value, and the temperature of the induction heating unit is controlled to a predetermined compensation temperature by the vaporization compensation mode.

The present invention specifically shows the control of the vaporization compensation mode in the combustion apparatus according to claim 5 . Here, when the temperature of the self-heating part is sufficiently high when the combustion amount increases, stable vaporization can be continued even if the temperature decrease due to the heat of vaporization increases. Further, when the amount of increase in the combustion amount is small, there is little decrease in the temperature of the self-heating unit due to the heat of vaporization, and no vaporization failure accompanying the temperature decrease occurs.
According to the present invention, by appropriately setting the second vaporization temperature and the predetermined amount of combustion that satisfy such conditions, there is a possibility that the temperature of the self-heating portion may decrease as the amount of combustion increases. In addition, it is possible to compensate for the temperature drop of the self-heating part by controlling the temperature of the induction heating part in the vaporization compensation mode.

According to a seventh aspect of the present invention, in the vaporization type combustion apparatus according to the sixth aspect of the present invention, when the self-heating part exceeds the second vaporization temperature or during the execution of the vaporization compensation mode, or the combustion amount is When it becomes below a predetermined value, it is set as the structure which stops the temperature rising control of an induction heating part, and complete | finishes vaporization compensation mode.

The present invention specifically shows the end timing of the vaporization compensation mode in the combustion apparatus according to claim 6 .
Here, even during the control in the vaporization compensation mode, when the self-heating portion exceeds the second vaporization temperature, the self-heating portion alone can be stably vaporized. Even during the control in the vaporization compensation mode, when the combustion amount decreases, the temperature decrease due to the heat of vaporization decreases, and vaporization by the self-heating unit alone becomes possible.
Therefore, according to the present invention, it is possible to end the vaporization compensation mode by detecting these states.

The invention according to claim 8 is the vaporization type combustion apparatus according to any one of claims 1 to 7 , wherein the control means is a part of a control period of at least one of the vaporization transition mode or the vaporization compensation mode or In all, it is set as the structure which reduces or increases the air supply amount by an air blower compared with the air supply amount according to the combustion amount in the said period.

  Here, in the vaporization transition mode in the combustion apparatus of the present invention, the transition to vaporization by the self-heating unit alone is performed while reducing the heat dependence rate with respect to the induction heating unit. Therefore, at the end of the vaporization transition mode, although the heat dependency rate on the induction heat generating portion has decreased, the self-heating portion has slightly decreased in temperature with the heating of the induction heat generating portion stopped, and the vaporization state has slightly decreased. The fuel gas concentration tends to decrease due to the reduction.

  Therefore, in part or all of the control period in the vaporization transition mode, the concentration of fuel gas supplied to the combustion unit is reduced by reducing the amount of air supplied by the blower compared to the amount of air supplied according to the amount of combustion. Is compensated and becomes substantially constant. Thereby, the fluctuation | variation of the fuel gas density | concentration at the time of transfer to the vaporization by a self-heating part is suppressed, and combustion stability is ensured.

  Further, in the vaporization compensation mode in the combustion apparatus of the present invention, auxiliary heating by the induction heating unit is performed as the combustion amount increases. Therefore, during the vaporization compensation mode, the fuel gas concentration is likely to increase due to a slight excess of vaporization due to the auxiliary heating of the induction heating unit in addition to the heat of the self-heating unit. Therefore, in part or all of the control period in the vaporization compensation mode, the amount of fuel gas supplied to the combustion unit is increased by increasing the air supply amount by the blower compared to the air supply amount according to the combustion amount. Is compensated and becomes substantially constant. Thereby, the fluctuation | variation of the fuel gas density | concentration at the time of the increase in combustion amount is suppressed, and combustion stability is ensured.

The invention according to claim 9 includes a vaporizing unit that heats and vaporizes the liquid fuel , and a blowing unit that supplies air, and the air supplied from the blowing unit and the fuel gas vaporized by the vaporizing unit. mixed and supplied to the combustion unit, the evaporative combustion device for burning, the vaporizing part is heated the preliminary heating wall by the electromagnetic induction heating unit has a pre-heating the peripheral wall, the induction heating the liquid fuel is supplied And an induction heating unit disposed downstream of the induction heating unit and provided with an opening on the induction heating unit side. The self heating unit mainly receives the heat of the combustion unit to raise the temperature, and is disposed in the self heating unit to perform induction heating. And a rotating member that stirs and mixes the gas in the self-heating unit, and the liquid fuel is scattered and vaporized toward the preliminary heat generating peripheral wall, and the air of the blowing unit Self-heating part on the downstream side by supply Flows to the remaining liquid fuel is configured to be scattered by the rotating member flow self-heating unit is vaporized is heated by self-heating unit, further, the induction heating portion temperature detection for detecting the temperature of the induction heating unit Means, a self-heating part temperature detecting means for detecting the temperature of the self-heating part, and a control means for controlling each part including the control of the electromagnetic induction heating means, the control means being vaporized by the induction heating part alone Or, from the vaporization by both the induction heating unit and the self-heating unit, the energization control is continued while reducing the energization power of the electromagnetic induction heating means according to the temperature rise of the self-heating unit, and both the induction heating unit and the self-heating unit Then, the fuel is vaporized and burned in the combustion section, and a vaporization transition mode for shifting to vaporization by the self-heating section alone as the temperature of the self-heating section rises is provided.

The present invention more specifically shows the configuration of the vaporizing section in the first aspect of the present invention. According to the present invention, by positioning the induction heating section capable of raising the temperature in a short time to the upstream side of the self-heating section, when the self-heating section is extremely low at the start of combustion, vaporization by the induction heating section alone is performed. It can ignite in a short time and start combustion. Further, when the self-heating portion is slightly lower than the temperature at which the liquid fuel is sufficiently vaporized at the start of combustion, the combustion can be started by igniting in a short time by the auxiliary vaporization by the induction heating portion.
In addition, after combustion is started, by the vaporization transition mode of the present invention, it is possible to smoothly shift from vaporization by the induction heat generation unit alone or vaporization by both the induction heat generation unit and the self heat generation unit to vaporization by the self heat generation unit alone, It is possible to reduce running costs while ensuring combustion stability.

  According to the first to third aspects of the present invention, the vaporization type combustion that can smoothly shift to the vaporization by the self-heating unit alone while suppressing the transient vaporization fluctuation, and that reduces the running cost while ensuring the stable combustion. A device can be provided.

  According to the fourth to sixth aspects of the present invention, it is possible to provide a vaporization type combustion apparatus that can prevent the occurrence of vaporization failure accompanying an increase in the amount of combustion and that has improved combustion stability.

  According to the seventh aspect of the present invention, it is possible to further reduce the variation in vaporization accompanying the control in the vaporization transition mode in the combustion apparatus according to the first to third aspects and the vaporization compensation mode in the combustion apparatus according to the fourth to sixth aspects. And a vaporization type combustion apparatus with further improved combustion stability.

  According to the eighth aspect of the present invention, the vaporization can be smoothly shifted to the vaporization by the self-heating unit alone while suppressing the transient vaporization fluctuation with a simple configuration, and the running cost is reduced while ensuring the stable combustion. A combustion apparatus can be provided.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory diagram showing a main configuration of a vaporization combustion apparatus 1 according to an embodiment of the present invention centering on a vaporization section. FIG. 2 is a flow path system diagram of the hot water supply device 2 incorporating the combustion device 1 shown in FIG.

First, the structure around the vaporization part 8 of the combustion apparatus 1 of this embodiment is demonstrated.
The vaporization part 8 is located in the center of the combustion part 7, as shown in FIG. The vaporization unit 8 includes an induction heating unit 10 heated by an induction coil (electromagnetic induction heating means) 77 and a self-heating unit 11 that mainly raises the temperature by receiving heat from the combustion unit 7. A first rotating member 23 is rotatably disposed inside the induction heat generating unit 10, and a second rotating member 25 is rotatably disposed inside the self-heating unit 11.

  The induction heating unit 10 has a hollow cylindrical shape having a central axis in the vertical direction. The induction heating unit 10 has a constant inner diameter from the approximate center in the height direction to the upper part, and the lower part extends from the approximate center to the lower part in the height direction. It has a shape with a reduced diameter so as to be tapered. An induction coil 77 is wound around the upper outer peripheral wall from the approximate center in the height direction. In addition, a temperature sensor (inductive heat generating part temperature detecting means) 100 for detecting temperature is provided on the induction heat generating part 10. In addition, an air introduction cylinder 71 that is slightly larger than the induction heating unit 10 is disposed outside the induction heating unit 10 so as to wrap the induction heating unit 10. The air introduction cylinder 71 is a hollow cylindrical shape having a central axis in the vertical direction, the upper side in the height direction has a constant inner diameter, and the lower side in the height direction is a cone that tapers downward. Have a shape.

The air introduction cylinder 71 and the induction heating part 10 are arranged with their central axes aligned, the heights of the opening surfaces on the upper side are substantially the same, and the opening surface on the lower side is the lower side of the induction heating part 10 The opening surface on the lower side of the air introduction cylinder 71 is positioned lower than the opening surface.
By arranging the air introduction cylinder 71 and the induction heat generating part 10 on a concentric axis, an annular space 131 is formed between the induction heat generating part 10 and the air introduction cylinder 71.

On the other hand, the self-heating portion 11 has a bottomed cylindrical shape, and its inner diameter is larger than the maximum outer diameter of the induction heating portion 10 and smaller than the maximum outer diameter of the air introduction cylinder 71. In addition, the inner diameter of the induction heating unit 10 is larger than the minimum outer diameter of the lower end of the air introduction cylinder 71. The self-heating unit 11 is fixed with the central axis of the air introduction cylinder 71 and the induction heating part 10 aligned and with the upper opening surface substantially aligned with the lower opening surface of the air introduction cylinder 71. Thereby, the inside of the induction heating unit 10 and the space 131 communicate with the inside of the self-heating unit 11, and the space between the upper side of the self-heating unit 11 and the lower side of the air introduction cylinder 71 is opened to the outside. A fuel gas flow path 51 that communicates with the combustion section 7 through the portion is formed.
A temperature sensor (self-heating part temperature detecting means) 115 for detecting the temperature is provided on the self-heating part 11.

A rotary shaft 21 is arranged in the vertical direction inside the vaporization unit 8. The rotary shaft 21 is located on the central axis of the air introduction cylinder 71, the induction heating unit 10, and the self-heating unit 11, passes through the air introduction cylinder 71 and the induction heating unit 10, and reaches the vicinity of the bottom surface of the self-heating unit 11. A first rotating member 23 and a second rotating member 25 are fixed to the rotating shaft 21. The first rotating member 23 is smaller than the maximum inner diameter of the induction heat generating part 10 and is fixed to the central part in the vertical direction of the induction heat generating part 10. The second rotating member 25 is smaller than the inner diameter of the self-heating unit 11 and is fixed to the center in the vertical direction of the self-heating unit 11.
In other words, when the rotating shaft 21 is rotated, the first rotating member 23 rotates inside the induction heating unit 10 and the second rotating member 25 rotates simultaneously inside the self-heating unit 11.

  A fuel pipe 116 is fixed to the upper portion of the vaporizing unit 8 so that the open end faces the upper surface of the first rotating member 23. The first rotating member 23 and the second rotating member 25 have a function of agitating the liquid fuel injected from the fuel pipe 116 while scattering the liquid fuel into fine particles by centrifugal force accompanying rotation. A fan 13 for supplying air to the vaporizer 8 is fixed to the rotary shaft of the motor 18 on the upstream side of the vaporizer 8.

  The periphery of the vaporization unit 8 of the vaporization combustion apparatus 1 of the present embodiment has the above-described configuration, and performs energization control to the induction coil 77, fuel supply control by the fuel pipe 116, and ignition control to the combustion unit 7. The control circuit unit 200 performs the concentration.

  In the vaporization unit 8 having such a configuration, when a high frequency current is passed through the induction coil 77, the generated magnetic field generates heat by generating an eddy current in the induction heating unit 10 that is a conductor. Therefore, the liquid fuel injected from the fuel pipe 116 to the first rotating member 23 scatters toward the inner wall of the induction heating unit 10 and collides with the heated inner wall to be vaporized. Here, when air is supplied from the upstream side of the vaporization unit 8, the air flowing in the induction heating unit 10 is mixed and stirred with the liquid fuel vaporized as primary air, and the mixed fuel gas is self-streamed on the downstream side. It flows into the heat generating part 11. At the same time, the air flowing through the space 131 also flows into the self-heating unit 11 as primary air. The fuel gas and air that have flowed into the self-heating unit 11 are further mixed by the second rotating member 25, flow out toward the fuel gas channel 51, reach the combustion unit 7, and are used for combustion.

  Further, when a flame is generated in the combustion unit 7, the self-heating unit 11 is heated by the flame. When the self-heating unit 11 reaches a high temperature, the liquid fuel can be vaporized even when the energization of the induction coil 77 is stopped. In other words, when the energization of the induction coil 77 is stopped, the temperature of the induction heating unit 10 decreases, so that the liquid fuel injected from the fuel pipe 116 is scattered by the first rotating member 23 and travels along the inner wall of the induction heating unit 10. It hangs down from the upper part of the second rotating member 25. And it receives the centrifugal force of the 2nd rotation member 25, is scattered toward the inner wall of the self-heating part 11, collides with the heated inner wall, and is vaporized. Thereafter, similarly to the case of vaporization in the induction heat generating unit 10, the mixture is stirred and mixed with the primary air flowing into the self-heating unit 11 through the inside of the induction heat generating unit 10 and the space 131, and the fuel gas flow path from the periphery. It flows out toward 51 and reaches the combustion section 7 to be used for combustion.

The combustion apparatus 1 of the present embodiment shown in FIG. 1 functions as a heat source for supplying hot water by being incorporated in the hot water supply apparatus 2 as shown in FIG.
The hot water supply device 2 has a control circuit unit 200 that supervises control of each unit including the combustion device 1, and exchanges heat obtained by combustion of the combustion device 1 with water supplied from a water tap (not shown). It is a device that heats. A remote controller 201 is connected to the control circuit unit 200, and a driving operation can be performed indoors away from a place where the hot water supply device 2 is installed.

  In order, as shown in FIG. 2, the vaporization combustion apparatus 1 is a downward combustion type (so-called reverse combustion type) that injects a flame downward, and a heat exchanger 135 is provided downstream of the combustion apparatus 1. Further, the downstream side is connected to the exhaust tube 134. In other words, the combustion apparatus 1 is disposed on the upper part of the can body 136 in which the heat exchanger 135 is built, and generates a flame toward the lower heat exchanger 135.

  The hot water supply device 2 includes a heat exchanger 135 that exchanges heat between the combustion gas generated in the combustion device 1 and a heat medium such as hot water, a flowing water circuit 141, and a fuel supply unit 142. The flowing water circuit 141 includes an inflow side channel 143 that supplies hot water from the outside, and an outflow side channel 145 that flows out the hot water heated in the heat exchanger 135 to the outside. The inflow channel 143 is connected to the water inlet 146 of the heat exchanger 135, and the outflow channel 145 is connected to the water outlet 147 of the heat exchanger 135.

  A flow rate sensor 150 (minimum operating water amount detection means) and a water incoming temperature sensor 151 are provided in the middle of the inflow side flow path 143. The flow rate sensor 150 detects the amount of hot water supplied via the inflow side flow path 143. When the flow rate sensor 150 detects a predetermined amount of water, the combustion device 1 starts an ignition operation. The incoming water temperature sensor 151 detects the temperature of water supplied from the outside.

  The outflow side channel 145 supplies high-temperature hot water heated by heat exchange with the combustion gas in the heat exchanger 135 to the hot water tap 152 such as a curan. In the middle of the outflow side flow path 145, a temperature sensor 153, a stirring unit 154, a flow rate adjustment valve 155, and a tapping temperature sensor 156 are provided. The flow rate adjusting valve 155 regulates the total amount of hot water discharged from the hot water tap 152 by opening and closing the outflow side passage 145. The temperature sensor 153 detects the temperature of hot hot water heated and discharged by the heat exchanger 135.

  The stirring unit 154 is provided at a connection portion between the outflow side channel 145 and a bypass channel 158 described later. In the stirring unit 154, the hot hot water heated in the heat exchanger 135 and the relatively low temperature hot water flowing in via the bypass channel 158 are mixed. A hot water temperature sensor 156 is provided on the downstream side of the stirring unit 154. The hot water temperature sensor 156 detects the temperature of the hot water stirred in the stirring unit 154.

  The inflow side channel 143 and the outflow side channel 145 are bypassed by a bypass channel 158. The downstream end of the bypass channel 158 is connected to the agitation unit 154 described above. A bypass flow rate adjustment valve 159 is provided in the middle of the bypass flow path 158. The bypass flow rate adjustment valve 159 adjusts the amount of water flowing into the stirring unit 154.

  In the hot water supply device 2 having such a configuration, hot water corresponding to the temperature set by the remote controller 201 is supplied to the hot water tap 152. In other words, when the hot-water tap 152 is opened, the water flowing in from the inflow side channel 143 is heated by the heat exchanger 135 and flows toward the outflow side channel 145. When the combustion start flow rate is detected by the flow rate sensor 150 (minimum working water amount detection means), the control circuit unit 200 transmits a combustion command signal to the combustion device 1 and starts combustion.

  When combustion starts, the control circuit unit 200 refers to the detected temperatures of the feed water temperature sensor 151 and the temperature sensor 153 and controls the flow rate adjustment valve 155 so that the detected temperature of the hot water temperature sensor 156 becomes the set temperature of the remote controller 201. In addition, the bypass flow rate adjustment valve 159 is controlled. That is, when the temperature detected by the hot water temperature sensor 156 is lower than the set temperature of the remote controller 201, the opening amount of the bypass flow rate adjustment valve 159 is decreased to reduce the amount of water bypassed to the outflow side flow path 145, Control is performed to reduce the amount of hot water flowing through the heat exchanger 135 by reducing the opening of the flow rate adjustment valve 155. Further, when the temperature detected by the hot water temperature sensor 156 is higher than the set temperature of the remote controller 201, the opening degree of the bypass flow rate adjustment valve 159 is increased to increase the amount of water bypassed to the outflow side flow path 145 or the flow rate. Automatic control is performed to increase the amount of hot water flowing through the heat exchanger 135 by increasing the opening of the regulating valve 155. As a result, hot water having a temperature set by the remote controller 201 is supplied from the hot-water tap 152.

  Next, details of the control performed in the combustion apparatus 1 of the present embodiment will be sequentially described. FIG. 3 is a flowchart showing the control performed by the combustion apparatus 1 of FIG. FIG. 4 is a flowchart showing details of control of induction coil 77 and blower (fan) 13 in the control shown in FIG. FIG. 5 is an explanatory diagram showing the temperature of the vaporizing section in the vaporization transition mode control shown in FIG. 4 in association with the time chart showing the operating state of each section. FIG. 6 is an explanatory diagram showing the temperature of the vaporization unit in the vaporization compensation mode control shown in FIG. 4 in association with the time chart showing the operation state of each unit. FIG. 7 is a flowchart showing a modification of the vaporization transition mode shown in FIG. FIG. 8 is an explanatory diagram showing the temperature of the vaporization unit in the vaporization transition mode shown in FIG. 7 in association with the time chart showing the operation state of each unit.

  In the following description, the combustion flag is a flag that is turned on during combustion when a flame is generated. The initial heating flag is a flag that is turned on during execution of the initial heating process of the induction heating unit 10, and the temperature increase flag is a flag that is turned on when the initial heating process is completed.

In the following description, the vaporization temperature To is the vaporization temperature of the liquid fuel, and is set to 200 ° C., which is the vaporization temperature of kerosene in this embodiment.
The first vaporization temperature T3 is a temperature at which the liquid fuel can be vaporized almost completely. In the present embodiment, the first vaporization temperature T3 is set to 210 ° C. higher than the vaporization temperature To.
The second vaporization temperature T6 is a temperature at which the liquid fuel can be completely vaporized. In the present embodiment, the second vaporization temperature T6 is set to 230 ° C. higher than the first vaporization temperature T3.
The lower limit temperature T5 is a lower limit of a temperature region in which the vaporization transition mode is executed, and in this embodiment, the lower limit temperature T5 is set to 180 ° C. at which part of the liquid fuel starts to vaporize.
The upper limit temperatures T4 and T4 ′ are the upper limits of the temperature region in which the vaporization transition mode is executed. In the present embodiment, the upper limit temperature T4 (210 ° C.) at which the liquid fuel is almost completely vaporized and the upper limit temperature T4. Is set to a higher upper limit temperature T4 ′.
Further, the vaporization control temperature T2 is a temperature at which liquid fuel can be sufficiently vaporized by heating the induction heating unit 10 and supplied to the self-heating unit 11, and is set to 250 ° C. in this embodiment.

With reference to FIGS. 1-6, control of the hot water supply apparatus 2 incorporating the combustion apparatus 1 of this embodiment is demonstrated below.
When the operation switch 202 of the remote controller 201 (see FIG. 2) is turned on, the control circuit unit 200 starts the initial heating process of the induction heating unit 10 as shown in FIG.
When the operation switch 202 is turned on, both the temperature raising flag and the initial heating flag are turned off. Therefore, the control circuit unit 200 proceeds from step 301 to steps 309 and 312, turns on the initial heating flag, and starts energizing the induction coil 77. Then, the control circuit unit 200 waits for the induction heating unit 10 to rise to the initial heating temperature T1 (see steps 300, 301, 309 to 312 and FIG. 5 in FIG. 3).

  This state is a process in which the induction heating unit 10 is heated to a high initial heating temperature T1 to raise the temperature of the entire vaporization unit 8, and the hot water tap 152 is opened and the flow rate sensor 150 detects the minimum operation water amount (Minimum Operation Quantity). : Hereafter referred to as MOQ), the transmission of the combustion command signal to the combustion device 1 is in a standby state.

  The control circuit unit 200 waits for the induction heating unit 10 to rise to the initial heating temperature T1 while circulating through steps 300, 301, and 309 to 311. When the induction heating unit 10 reaches the initial heating temperature T1, the initial heating flag is turned off and the temperature raising flag is turned on (see steps 300, 301, 309 to 311 and 313 in FIG. 3 and FIG. 5). At this time, the induction heat generating unit 10 is heated, and the entire vaporizing unit 8 is heated, so that ignition is possible.

  When the temperature raising flag is turned on and the initial heating process is completed, the control circuit unit 200 monitors the detection of the MOQ. When the MOQ is detected, since the combustion flag is off, the routine proceeds to step 306, where the induction heating unit 10 is controlled to the vaporization control temperature T2, and the process proceeds to the ignition process. The ignition process is performed after performing a predetermined pre-purge, and when the ignition is completed, the control circuit unit 200 turns on the combustion flag. When ignition is completed, combustion control is started thereafter, and hot water heated from the hot-water tap 152 is supplied (see steps 300 to 303, 306 to 308, 304, 305 and FIG. 5 in FIG. 3).

When ignition is performed and combustion control is started, the control circuit unit 200 continues the combustion operation while circulating steps 300 to 305 to supply hot water. When the hot-water tap 152 is closed during the hot water supply and the MOQ detection is stopped, the control circuit unit 200 performs necessary combustion stop processing such as post-purge to stop the combustion control and turn off the combustion flag (above). FIG. 3 steps 300 to 302, 314 to 316).
Thereafter, the control circuit unit 200 monitors the arrival of the MOQ while circulating the steps 300 to 302, 314, and 317 to preheat the induction coil 77.

  When the operation switch 202 of the remote controller 201 is turned off, the control circuit unit 200 turns off all the flags and performs necessary operation stop processing. Thereafter, monitoring of the ON operation of the operation switch 202 is continued.

  Here, during the combustion operation that circulates through steps 300 to 305 in FIG. 3, in step 305, the control circuit unit 200 monitors the temperatures of the self-heating unit 11 and the induction heating unit 10 while energizing the induction coil 77 and the fan 13. Take control. The present invention is characterized by the energization control of the induction coil 77 and the fan 13 in the step 305, and details of the control will be described below.

When the combustion control is started, the control circuit unit 200 controls the energization of the induction coil 77 while monitoring the temperature of the self-heating unit 11 with reference to the temperature detected by the temperature sensor 115.
That is, as shown in FIG. 4, when the self-heating unit 11 is lower than the lower limit temperature T5, the control circuit unit 200 controls energization of the induction coil 77 so that the induction heating unit 10 reaches the vaporization control temperature T2 ( (See steps 330, 336, 338, 340 in FIG. 4 and FIG. 5).
In this state, combustion is started and the self-heating unit 11 starts to rise in temperature, and the induction heating unit 10 is maintained at the vaporization control temperature T2 to perform stable vaporization.

When combustion continues and the self-heating unit 11 reaches the lower limit temperature T5, the control circuit unit 200 starts control in the vaporization transition mode. In other words, when the self-heating unit 11 reaches the lower limit temperature T5, the control circuit unit 200 reduces energization to the induction coil 77 and controls the temperature of the induction heating unit 10 to be lowered.
In the present embodiment, the temperature is continuously lowered with a temperature gradient so that the induction heating unit 10 reaches the vaporization temperature To at the end of the vaporization transition mode (steps 330, 336, 338, FIG. 4). 339, see FIG.
In this state, the temperature of the induction heating unit 10 is controlled to be lowered according to the temperature rise of the self heating unit 11, and the heat dependency rate for vaporization is gradually shifted from the induction heating unit 10 to the self heating unit 11.

When the combustion progresses and the self-heating unit 11 reaches the upper limit temperature T4, the control circuit unit 200 stops energizing the induction coil 77 and ends the control of the series of vaporization transition modes (step 330 in FIG. 4). 336, 337, see FIG.
Thereby, the induction heating part 10 falls rapidly from the vaporization temperature To. However, the self-heating unit 11 has already risen over the upper limit temperature T4 and is in a state where the liquid fuel can be vaporized almost completely by itself. In addition, the induction heating unit 10 has been cooled to the vaporization temperature To, and the energization is cut off in a state where the heat dependency rate on the vaporization is reduced.
Therefore, the transitional fluctuation of vaporization accompanying the interruption of the energization of the induction heating unit 10 is reduced, and stable vaporization is maintained by the independent heat of the self-heating unit 11, and combustion continues.

  As described above, according to the combustion device 1 of the present embodiment, the heat dependence rate is not self-sustained by the vaporization transition mode, instead of waiting for the temperature rise of the self-heating unit 11 while keeping the heat generation amount of the induction heating unit 10 constant. While shifting to the heat generating part 11 side, the temperature rise of the self-heating part 11 is waited, and then the energization to the induction coil 77 is cut off. As a result, transient fluctuations in the vaporization state are reduced, the fuel gas is stably supplied, and the occurrence of undershoot can be significantly reduced as compared with the case where the vaporization transition mode is not performed (FIG. 5 Fuel). (See wavy lines for gas input).

  The above description has been given by taking as an example the case of performing the control in the vaporization transition mode at the beginning of combustion, but is not limited to the early stage of starting combustion, but can be similarly applied to the case where recombustion is started. . Further, at the time of re-combustion, it is also possible to apply the vaporization transition mode from the time when the self-heating unit 11 is in the temperature region between the lower limit temperature T5 and the upper limit temperature T4.

Next, control in the vaporization compensation mode when the combustion amount fluctuates during combustion (during hot water supply) will be described.
During the hot water supply, when the hot water set temperature is reduced by the remote controller 201 of the hot water supply device 2 or the opening degree of the hot water tap 152 is lowered, the control circuit unit 200 transmits a control signal for reducing the combustion amount to the combustion device 1. To do. When the combustion amount decreases, as shown in FIG. 6, the supply of liquid fuel is reduced and the supply amount of the vaporized fuel gas is also reduced. At the same time, the rotation speed of the blower is also reduced and the combustion continues. Thus, when the combustion amount decreases, the vaporization is continued by the heat of the self-heating unit 11 alone, and there is little occurrence of transient fluctuations in the vaporized state.

When the combustion amount increases again from the state where the combustion amount has decreased, control in the vaporization compensation mode is performed.
When the combustion amount increases, the control circuit unit 200 determines whether the increased combustion amount is equal to or greater than a predetermined number (set to 18 in the present embodiment) as shown in FIG. As a result of the determination, when the fuel amount after the increase is less than No. 18, the combustion is continued as it is, assuming that the temperature decrease of the self-heating unit 11 accompanying the increase in the combustion amount is small. In this case, since the self-heating unit 11 exceeds the upper limit temperature T4, the induction coil 77 is not energized (see steps 330, 331, 336, and 337 in FIG. 4).

  On the other hand, when the increased combustion amount is No. 18 or more, the control circuit unit 200 determines whether or not the temperature of the self-heating unit 11 at that time is equal to or higher than the second vaporization temperature T6. As a result of the determination, if the self-heating part 11 is equal to or higher than the second vaporization temperature T6, the self-heating part 11 can be vaporized independently even if the temperature of the self-heating part 11 decreases as the combustion amount increases. Combustion is continued while energization of the coil 77 is stopped (see steps 330 to 332 and 335 in FIG. 4).

However, when the increased combustion amount is No. 18 or more and the temperature of the self-heating unit 11 at that time is lower than the second vaporization temperature T6, the self-heating unit 11 is caused to increase in vaporization temperature as the combustion amount increases. Since there is a risk of lower than To, control in the vaporization compensation mode is executed.
When entering the vaporization compensation mode, the control circuit unit 200 energizes the induction coil 77 and auxiliaryly controls the temperature rise of the induction heating unit 10 to the compensation temperature T7 (set to 100 ° C. in the present embodiment). At the same time, the blower (fan) 13 is controlled to a rotational speed slightly higher than the rotational speed corresponding to the increased combustion amount (see steps 330 to 334 in FIG. 4 and FIG. 6).

  Thereby, the malfunction that the self-heating part 11 falls below the vaporization temperature To as the combustion amount increases is prevented by the auxiliary temperature increase of the induction heating part 10. Further, the auxiliary heating of the induction heating unit 10 causes the liquid fuel to be slightly over-vaporized in the vaporization compensation mode and the fuel gas concentration increases. However, by increasing the rotational speed of the fan 13, the fuel gas concentration is increased. Can be suppressed. As a result, as shown in FIG. 6, the fuel gas in the vaporization compensation mode is prevented from overshooting, and stable combustion can be continued.

  When the self-heating unit 11 reaches the second vaporization temperature T6 or more during combustion by the control in the vaporization compensation mode, the energization to the induction coil 77 is stopped because the combustion can be continued by the vaporization by the self-heating unit 11 alone. Then, the vaporization compensation mode is terminated (see steps 330 to 332 and 335 in FIG. 4 and FIG. 6).

Thus, according to the combustion apparatus 1 of the present embodiment, at the start of combustion or at the time of re-combustion, the vaporization transition mode can smoothly shift to vaporization of the self-heating unit 11 alone in a short time, and combustion stability It is possible to reduce the energization power to the induction coil 77 while ensuring the above.
In addition, even when the amount of combustion varies, the vaporization compensation mode can smoothly return to the vaporization of the self-heating unit 11 alone in a short time while preventing vaporization failure, and combustion with stable stability becomes possible.

Next, a modification of the vaporization transition mode shown in the embodiment will be described.
In the vaporization transition mode shown in the embodiment, the temperature of the induction heating unit 10 is decreased from the vaporization control temperature T2 to the vaporization temperature To during the period in which the self-heating unit 11 is heated from the lower limit temperature T5 to the upper limit temperature T4. there were. Moreover, in the said embodiment, rotation speed control of the air blower (fan) 13 was not performed in the vaporization transfer mode.
On the other hand, in the vaporization transition mode of the modified example, the upper limit temperature T4 ′ (set to 230 ° C.) is set higher than that in the embodiment, and the first vaporization temperature T3 (set to 210 ° C.) equal to the upper limit temperature T4. ) Is newly set, and the temperature of the induction heating unit 10 is decreased while controlling the rotational speed of the fan 13. Since the control other than the vaporization transition mode is the same as that in the above embodiment, a duplicate description is omitted.

As shown in FIG. 7, in the vaporization transition mode in the modified example, during the combustion control, during the period when the self-heating unit 11 is less than the lower limit temperature T <b> 5, the control circuit unit 200 controls energization to the induction coil 77 to induce Is controlled to maintain the vaporization control temperature T2 (see step 305 in FIG. 3, steps 330, 350, 352, 354, 359 in FIG. 7 and FIG. 8).
In this state, combustion is started and the self-heating unit 11 starts to rise in temperature, and the induction heating unit 10 is maintained at the vaporization control temperature T2 to perform stable vaporization.

  And when the self-heating part 11 becomes more than minimum temperature T5, the control circuit part 200 will start control by vaporization transfer mode. When entering the vaporization transition mode, during a period in which the self-heating unit 11 rises to the first vaporization temperature T3, the control circuit unit 200 controls the induction coil 77 to be energized and controls the temperature of the induction heating unit 10 to be lowered. When 10 is lowered to the vaporization temperature To, the induction coil 77 is energized so as to maintain the vaporization temperature To. At the same time, the rotational speed of the fan 13 is slightly decreased from the rotational speed corresponding to the combustion amount (see steps 330, 350, 352, 354 to 358 in FIG. 7 and FIG. 8).

In this state, the induction heating unit 10 is cooled down and held at the vaporization temperature To according to the temperature rise of the self heating unit 11, and the heat dependence rate for vaporization is shifted from the induction heating unit 10 to the self heating unit 11. . Moreover, although the heat dependence rate with respect to the induction heating part 10 is reduced, the self-heating part 11 is likely to slightly decrease in temperature as the heating of the induction heating part 10 is stopped. The rotational speed of the fan 13 is reduced in order to prevent the fuel gas concentration from decreasing due to the decrease in the vaporized state due to this temperature decrease.
That is, while the self-heating unit 11 rises from the lower limit temperature T5 to the first vaporization temperature T3, the heat dependency rate of vaporization is gradually shifted from the induction heating unit 10 to the self-heating unit 11, and the self-heating unit 11 When the vaporization temperature T3 is reached, the self-heating unit 11 can be vaporized alone.

Next, when the self-heating unit 11 becomes equal to or higher than the first vaporization temperature T3, the control circuit unit 200 controls the induction coil 77 to energize the induction heating unit 10 while the reduction of the rotation speed of the fan 13 is continued. The temperature lowering control is performed toward T8 (set to 150 ° C. in the present embodiment) (see steps 330, 350, 352, 353, 357, and FIG. 8 in FIG. 7).
In this state, when the self-heating unit 11 is heated to the upper limit temperature T4 ′ and the auxiliary heating is performed by the induction heating unit 10 and the combustion amount increases during the period, the liquid fuel increases. It has the effect | action which prevents that the self-heating part 11 brings about a temperature fall by the increase in accompanying heat of vaporization.

When the self-heating unit 11 reaches the upper limit temperature T4 ′, the control circuit unit 200 stops energization of the induction coil 77 and returns the rotational speed of the fan 13 to the rotational speed corresponding to the combustion amount. The control in the vaporization transition mode is terminated and normal combustion control is continued (see steps 330, 350, 351 and FIG. 8 in FIG. 7).
As described above, according to the vaporization transition mode of the modification shown in FIGS. 7 and 8, it is possible to prevent the vaporization failure due to the increase in the combustion amount in the vaporization transition mode while suppressing the transient fluctuation of the vaporization state. It is possible to reduce the running cost associated with energization while ensuring combustion stability.

  7 and 8 have been described by taking as an example the case where the control in the vaporization transition mode is performed in the early stage of the start of combustion, but in the case where re-combustion is started as in the above embodiment. In addition, it is also possible to apply the self-heating unit 11 from the time when the self-heating unit 11 is in the temperature region between the lower limit temperature T5 and the upper limit temperature T4 during re-combustion.

Further, in the modification shown in FIGS. 7 and 8, it is possible to adopt a simplified control configuration in which the rotation control of the fan 13 is not performed in the vaporization transition mode and the vaporization compensation mode.
Also, in the embodiment shown in FIGS. 4 to 6, a control configuration in which the rotation control of the fan 13 in the vaporization transition mode can be added, and the rotation control of the fan 13 in the vaporization compensation mode is not performed. A configuration is also possible.
In the embodiments shown in FIGS. 4 to 6, the temperature of the induction heating unit 10 is controlled to be continuously decreased. However, the temperature decrease can be controlled step by step.
Further, in the modified examples shown in FIGS. 7 and 8, the induction heating unit 10 is continuously lowered to the vaporization temperature To and held, and again lowered to the energization stop temperature T8 again. However, the temperature can be lowered step by step in any temperature drop control.

Next, specific examples of the combustion apparatus 1 according to the present invention will be described. In the following description, the upper and lower relationships are based on the state in which the combustion device 1 is installed in the hot water supply device 2.
FIG. 9 is a cross-sectional view of the combustion apparatus of the present embodiment. FIG. 10 is an exploded perspective view showing the overall component configuration of the combustion apparatus of the present embodiment.

In FIG. 9, 1 shows the combustion apparatus of a present Example. As shown in FIG. 1, the combustion device 1 of this embodiment is built in the hot water supply device 2 with the flame hole facing downward, and the blower 3, the drive machine unit 5, and the air amount adjustment unit 6 are stacked from above. The combustion part 7 and the vaporization part 8 are provided in the lower part.
The vaporization unit 8 has an induction heat source unit 9 and a self-heating unit 11 as will be described later. The induction heat source unit 9 is located between the air amount adjusting unit 6 and the combustion unit 7, and the self-heating unit 11 is located in the combustion unit 7.

  If it demonstrates sequentially from an upper side, the air blower 3 will arrange | position the fan 13 rotatably in the concave housing 12 made by bending a steel plate. An opening 15 is provided at the center of the housing 12.

  The drive machine unit 5 has a box 16, and a motor 18 is attached to the center of the top plate 17. As for the motor 18, the rotating shafts 20 and 21 protrude from the both ends, and the rotating shafts 20 and 21 have penetrated substantially the full length of the combustion apparatus 1. FIG. As will be described later, the upper rotating shaft 20 of the motor 18 is connected to the fan 13, and the lower rotating shaft 21 is connected to the first rotating member 23 and the second rotating member 25 of the vaporizing unit 8. Yes.

  As shown in FIG. 10, the air amount adjusting unit 6 has a disk-shaped moving side plate member 26 superimposed on a fixed side plate member 27. The moving-side plate-like member 26 has a plurality of substantially triangular openings 30 provided radially around a central shaft insertion hole 28. The fixed side plate member 27 is provided with a shaft insertion hole 35 and an opening 33 at positions corresponding to the shaft insertion hole 28 and the opening 30 of the moving side plate member 26. The fixed side plate member 27 is provided with a large number of small holes 36 at positions where they do not overlap when the movable side plate member 26 is overlapped.

As shown in FIG. 9, when the rotary shaft 40 of the step motor 38 attached to the box 16 rotates, the air amount adjusting unit 6 swings the drive piece 37 engaged with the rotary shaft 40 and the moving plate member 26. Move. As a result, the moving side plate member 26 rotates relatively on the fixed side plate member 27 around the central shaft insertion hole 28.
The rotation of the moving plate member 26 changes the area of the opening that communicates the moving plate member 26 and the fixed plate member 27, thereby adjusting the amount of air.

  As shown in FIGS. 9 and 10, the combustion part 7 is formed by a flow dividing member 41, a flame hole base 43 and a flame hole member 45, and these components are housed in the combustion part housing 14 (FIG. 9). Is.

  Each of the flow dividing member 41, the flame hole base 43 and the flame hole member 45 is a rectangular plate-like member, and is provided with large openings 46, 52, and 58 at the center.

  The flow dividing member 41 is a flat plate-like member, and is provided with a large number of elongated holes 47, 48, 50 around the opening 46. The flame hole base 43 is made of aluminum die casting, and is provided with a complicated frame, an opening and a groove. The upper surface side of the flame hole base 43 mainly functions as a flow path constituting surface of fuel gas and secondary air, and the lower surface side functions as a flame hole mounting surface. In other words, the flame hole base 43 has an outer combustion wall 49 surrounding the outer periphery as shown in FIG. 9, and the combustion part 7 in which a flame is actually generated is formed therein. The flame hole base 43 has a flow path through which a mixed gas of fuel gas and air vaporized in the vaporization section 8 flows, and a flow path through which secondary air flowing from the openings 47, 48, and 50 of the flow dividing member 41 flows. Is formed.

  As shown in FIG. 10, the flame hole member 45 is a plate-like member that is overlapped with the flame hole base 43, and surrounds the opening 58 for the self-heating portion 11 provided in the center and has a large number of small holes 60 and small holes. The holes 61 are regularly arranged.

  The combustion unit 7 is disposed in the combustion unit housing 14 in a state where the flame hole base 43, the flow dividing member 41, and the flame hole member 45 are combined in the above-described state. The combustion section 7 includes a secondary air flow path that passes from the flow dividing member 41 side through the flame hole base 43 and exits to the flame hole member 45 side, a flow path in the flame hole base 43, and a small hole in the flame hole member 45. A fuel gas passage communicating with the outside through 61 is formed.

  Next, the vaporization unit 8 will be described. FIG. 11 is an exploded perspective view of the periphery of the vaporization unit of the combustion apparatus of the present embodiment. FIG. 12 is a perspective view of a fuel passage cylinder that constitutes the induction heat generating section of the vaporizing section. FIG. 13 is a front view, a plan view, a left and right side view, and a bottom view of a fuel passage cylinder constituting the induction heat generating portion of the vaporizing portion. FIG. 14 is a partial cross-sectional perspective view of the induction heat source unit of the vaporization unit. 15 is a perspective view of the vicinity of the combustion unit of the combustion apparatus of FIG. 1 as viewed from above.

  The vaporization part 8 employ | adopted with the combustion apparatus 1 of a present Example has two types of heat sources. That is, the vaporization unit 8 employed in the present embodiment includes an induction heat source unit 9 and a self-heating unit 11 as shown in FIGS. And the 1st rotation member 23 and the 2nd rotation member 25 are provided in the vicinity of both heat-emitting parts, respectively. An air introduction cylinder 71 for supplying appropriate primary air to the induction heat source unit 9 and the self-heating unit 11 is provided.

That is, as shown in FIG. 11, the vaporization unit 8 includes a first rotating member 23, a donut-shaped heat insulating material 73, a fuel passage cylinder (induction heat generating unit) 75, a cylindrical heat insulating material 76, a coil member (induction coil) 77, The first air introduction cylinder 78, the second air introduction cylinder 80, the second rotating member 25, and the self-heating unit 11 are formed.
The induction heat source section 9 is constituted by the fuel passage cylinder 75, the cylindrical heat insulating material 76, the donut-shaped heat insulating material 73, and the coil member 77, and the first air introduction cylinder 78 and the second air introduction cylinder 80 provide air. An introduction cylinder 71 is configured.

If it demonstrates sequentially, the fuel passage cylinder 75 will function as the induction heating part 10, and is a cylinder made from the material which has electroconductivity and has a certain amount of electrical resistance. More specifically, the fuel passage cylinder 75 is made of a thin stainless steel material so that induction heating is easy.
The fuel passage cylinder (induction heat generating portion 10) 75 is open at both ends, but has a special shape as shown in FIGS. 11 to 13, and the shape is greatly different between the upper side and the lower side. In other words, the region 81 on the upper half side of the fuel passage cylinder 75 has a cylindrical shape with a substantially constant diameter. The open end (opening on the upper side) of the fuel passage cylinder 75 opens in the direction of the axis XX (FIG. 13 a) of the fuel passage cylinder 75. A flange portion 83 is formed at the opening end (upper side opening) of the fuel passage cylinder 75.

On the other hand, the region 82 on the lower side of the fuel passage cylinder 75 has a conical shape. An opening 85 on the lower side of the fuel passage cylinder 75 opens in an inclined direction with respect to the axis XX (FIG. 13) of the fuel passage cylinder 75 as shown in FIG.
That is, the fuel passage cylinder 75 has the lower opening 85 inclined with respect to the posture during use, and there is a difference in height at the lower opening end.
The lower opening 85 has an inner portion folded back, and a bowl-shaped groove 87 inside the opening end is formed. That is, the inner surface of the fuel passage cylinder 75 functions as the preliminary heat generating peripheral wall 64. In this embodiment, a structure in which a hook-like groove 87 is formed in the lower portion of the inner surface of the fuel passage cylinder 75 as the preliminary heat generating peripheral wall 64. It is.
An opening 88 is formed in the groove 87 at the lowest position of the opening 85. The opening 88 is specifically a small hole, and is provided for collecting the fuel that has not been vaporized and dropping it on the side of the lower self-heating portion 11.

  The cylindrical heat insulating material 76 is a cylinder made of a material having both heat resistance and heat insulating properties. The inner diameter of the cylindrical heat insulating material 76 is equal to the outer diameter of the region 81 on the upper side of the fuel passage cylinder 75 described above. The height of the cylindrical heat insulating material 76 is equal to the length of the region 81 on the upper side of the fuel passage cylinder 75. As described above, the cylindrical heat insulating material 76 is made of a material having both heat resistance and heat insulating properties. Specifically, glass wool, ceramic, or the like is employed.

  The donut-shaped heat insulating material 73 is disk-shaped and has a large opening at the center. The donut-shaped heat insulating material 73 is also made of a material having both heat resistance and heat insulating properties such as glass wool and ceramic.

  The coil member 77 is configured by a bobbin 90 and a coil wire 91 as shown in FIG. The bobbin 90 itself has a function as a heat insulating member, and is made of unsaturated polyester having both heat insulating properties and heat resistance. The shape of the bobbin 90 is such that flange portions 93 and 94 are provided at both ends of the cylindrical body portion 92 as shown in FIG.

  The coil wire 91 is a normal copper wire and is wound in a spiral shape. The shape of the coil wire is not limited to a spiral shape, and may be, for example, a hook shape. The coil wire 91 is a litz wire, is spirally wound around the outer periphery of the cylindrical portion 92 of the bobbin 90, and is further hardened with silicon varnish or the like so that the coil wire 91 cannot be unwound. In addition, several (8 in the present embodiment) ferrite guides 95 are provided on the outer peripheral portion of the coil wire 91 so as to concentrate the lines of magnetic force generated by energization on the fuel passage cylinder 75 (the induction heat generating portion 10) to be heated. Is fixed.

The induction heat source section 9 is composed of the fuel passage cylinder 75, the cylindrical heat insulating material 76, the donut-shaped heat insulating material 73, and the coil member 77, and the cylindrical heat insulating material 76 is disposed on the outer periphery of the fuel passage cylinder 75. Further, a coil member 77 is provided on the outer periphery thereof (in FIG. 14, the cylindrical heat insulating material 76 is omitted for the purpose of drawing). Therefore, a cylindrical heat insulating material 76 and a bobbin 90 having a function as a heat insulating material are interposed between the coil wire 91 and the fuel passage cylinder 75, and the coil wire 91 and the fuel passage cylinder 75 are separated by both. Heavyly insulated.
Further, a donut-shaped heat insulating material 73 is interposed between the flange portion 83 at the opening end (upper side opening) of the fuel passage cylinder 75 and the flange portion 93 of the bobbin 90 (in FIG. 14, for the sake of drawing, The donut-shaped heat insulating material 73 is abbreviated).

The induction heat source unit 9 is provided with a temperature sensor (induction heating unit temperature detection means) 100 that detects the temperature of the fuel passage cylinder 75 that forms the induction heating unit 10 that is a heating member. The temperature sensor 100 is specifically a thermistor and has a flat plate-shaped temperature detection unit 101.
In this embodiment, as shown in FIG. 14, a through hole 102 is provided in the flange portion 93 of the bobbin 90, and a part of the temperature sensor 100 is held and a signal line or the like is led out from the through hole 102. Further, a cushion material 103 is provided between the temperature detection unit 101 and the flange portion 93 of the bobbin 90, and presses the temperature detection unit 101 against the flange portion 83 of the fuel passage cylinder 75. Specifically, the cushion material 103 is a disc spring or a leaf spring made of silicon rubber or stainless steel. Alternatively, a small-diameter O-ring or the like can be used as a cushioning material.

  That is, in this embodiment, the temperature sensor (inductive heat generating part temperature detecting means) 100 is held by the bobbin 90 having a function as a heat insulating material. Furthermore, the temperature detection unit 101 receives a reaction force from the bobbin 90 having a function as a heat insulating material and is pressed against the outer surface of the fuel passage cylinder 75. Further, it is desirable to apply a paste having excellent thermal conductivity, such as silicon, on the surface of the temperature detection unit 101.

  The self-heating portion 11 is a cylindrical body having a bottom portion 96 and a peripheral portion 97 as shown in FIGS. 9 and 10, and the bottom portion 96 is closed and the upper portion is opened. That is, the self-heating part 11 has a recessed shape, the bottom 96 and the peripheral part 97 are closed, airtight and watertight, and the upper part is open.

The self-heating portion 11 has the bottom 96 and the peripheral portion 97 as described above, and has a cup-like shape. As shown in FIGS. 9 and 10, the self-heating portion 11 is formed in the central opening 52 portion of the flame hole base 43. It is attached. The position of the self-heating part 11 is in the center of the flame hole base 43, is surrounded by the flame holes (small holes 61), and is located close to the combustion part 7. Moreover, most of the self-heating part 11 is exposed to the combustion part 7 side. More specifically, the entire bottom portion 96 of the self-heating portion 11 and most of the peripheral portion 97 are exposed to the combustion portion 7 side. Therefore, as will be described later, the self-heating unit 11 is heated from the outside by a flame generated from the flame hole (small hole 61) during combustion. As a result, the inner peripheral surface (self-heating peripheral wall) 66 and the bottom surface portion 67 of the self-heating part 11 are heated and the temperature is raised.
Further, a temperature sensor (self-heating part temperature detecting means) 115 is embedded in the self-heating part 11 (FIG. 9).

  In order to efficiently vaporize the liquid fuel inside the fuel passage cylinder 75, the first rotating member 23 makes the liquid fuel (used in this embodiment kerosene) injected from the fuel pipe 116 into fine particles, and the fuel passage cylinder (Induction heat generating portion) While being scattered toward the preliminary heat generating peripheral wall 64 of the 75, the vaporized fuel gas and primary air are agitated and mixed uniformly.

  On the other hand, the second rotating member 25 is for scattering the liquid fuel dropped from above toward the self-heating peripheral wall 66 of the self-heating unit 11 and stirring and mixing the fuel gas and the primary air.

As shown in FIG. 11, the first air introduction cylinder 78 and the second air introduction cylinder 80 constitute an air introduction cylinder 71.
The first air introduction cylinder 78 is formed by bending a thin plate, and includes an outer flange portion 127, a cylindrical portion 128, and an inner flange portion 129 as shown in FIG. That is, the outer flange portion 127 is at one open end of the cylindrical portion 128. The outer flange portion 127 is positioned on the upper side when in use.
The cylindrical portion 128 has an inner diameter larger than the outer diameter of the induction heat source unit 9 described above, and the inner diameter is slightly reduced on the distal end side in the air flow direction.

An inner flange portion 129 is provided on the front end side of the air flow of the cylindrical portion 128.
On the other hand, the second air introduction cylinder 80 has a conical shape. The opening 130 in the upper part of the second air introduction cylinder 80 is equal to the opening diameter of the tip portion of the first air introduction cylinder 78 described above. Moreover, the opening diameter of the lower part of the 2nd air introduction cylinder 80 is smaller than the opening diameter of the above-mentioned self-heating part 11. FIG.
The first air introduction cylinder 78 and the second air introduction cylinder 80 are overlapped to form a series of air flow paths. A packing (not shown) is interposed at the joint portion of the first air introduction cylinder 78.

The vaporization unit 8 has the induction heat source unit 9 and the self-heating unit 11 as described above. The induction heat source unit 9 is located between the air amount adjusting unit 6 and the combustion unit 7, and the self-heating unit 11 is located in the combustion unit 7.
As described above, the vaporizing unit 8 includes the first rotating member 23, the donut-shaped heat insulating material 73, the fuel passage cylinder 75, the cylindrical heat insulating material 76, the coil member 77, the first air introduction cylinder 78, and the second air introduction cylinder 80. The second rotating member 25 and the self-heating unit 11 are all arranged side by side on the same axis. That is, the fuel passage cylinder 75, the cylindrical heat insulating material 76, the donut-shaped heat insulating material 73, and the coil member 77 are provided in the air introduction cylinder 71 constituted by the first air introduction cylinder 78 and the second air introduction cylinder 80. The induction heat source unit 9 is arranged, and the central axis of the air introduction cylinder 71 coincides with the central axis of the induction heat source unit 9.

The self-heating unit 11 is provided below the air introduction tube 71 and the induction heat source unit 9, and the tip of the air introduction tube 71 is open toward the opening (back side) of the self-heating unit 11. Further, the fuel passage cylinder 75 constituting the induction heating unit 10 is also opened toward the back side of the self-heating unit 11.
The first rotating member 23 is located inside the induction heating unit 10, and the second rotating member 25 is located inside the self-heating unit 11. More specifically, the first rotating member 23 is in the fuel passage cylinder 75 constituting the induction heat generating unit 10 and is located in a space surrounded by the preliminary heat generating peripheral wall 64. The second rotating member 25 is located in a space surrounded by the self-heating peripheral wall 66 of the self-heating unit 11.

Further, a fuel pipe 116 is inserted into the fuel passage cylinder 75 (induction heat generating portion 10), and the fuel pipe 116 reaches the upper portion of the first rotating member 23 as shown in FIG.
More specifically, the fuel pipe 116 hangs down straight from the opening at the top of the induction heating unit 10 and reaches the top of the first rotating member 23 from above. Then, liquid fuel such as kerosene is dropped from the fuel pipe 116 to the first rotating member 23.

  In addition, the induction heating unit 10 has the groove 87 inclined to the opening 85 as described above, and the opening 87 is formed in the groove 87, and the opening 88 is located above the second rotating member 25. . That is, the opening 88 is in the upper part near the center of the second rotating member 25.

Next, the assembly structure of each part of the combustion apparatus 1 of the present embodiment will be described.
The combustion apparatus 1 according to the present embodiment includes a blower 3, a drive machine unit 5, an air amount adjustment unit 6, and a vaporization unit 8, which are sequentially stacked with their central axes aligned with each other. The blower 3 is directly screwed. In other words, in this embodiment, the rotation center of the blower 3, the shaft insertion holes 28 and 35 of the air amount adjustment unit 6, and the central axis of the vaporization unit 8 are linearly arranged on the same axis. Since the components of the vaporizing section 8 itself are also arranged side by side in the same axis, the rotation center of the blower 3, the shaft insertion holes 28 and 35 of the air amount adjusting section 6, and the central axis of the vaporizing section 8. Therefore, the rotation center axes of the two rotating members 23 and 25 of the vaporizing unit 8 also coincide with each other.

  An air amount adjusting unit 6 is screwed to the upper part of the driving machine unit 5. A vaporization unit 8 is located below the air amount adjustment unit 6. In other words, the larger opening of the air introduction cylinder 71 is attached to the center of the air amount adjusting unit 6 via the packing.

The central axis of the air introduction cylinder 71 coincides with the shaft insertion holes 28 and 35 of the moving side plate-like member 26 and the fixed side plate-like member 27 of the air amount adjusting unit 6, and the air introduction cylinder 71 is on the center side of the fixed side plate-like member 27. It will be located so as to cover the area. Therefore, the air discharged from the area on the center side of the air amount adjusting unit 6 is captured by the air introduction cylinder 71.
As described above, the induction heat generating section 10 is provided in the air introduction cylinder 71, and the induction heat generation section 10 has a fuel passage cylinder 75 at the center and communicates vertically. The air discharged from the air is captured by the air introduction cylinder 71 and is divided into the air flowing through the central fuel passage cylinder 75 (induction heating unit 10) and the air flowing through the peripheral part of the induction heat source unit 9.

That is, since there is a fuel passage cylinder 75 in the air introduction cylinder 71, a part of the air passes through the fuel passage cylinder 75 and reaches the self-heating unit 11.
Further, since an annular space 131 is provided between the inner surface of the air introduction cylinder 71 and the outer periphery of the induction heating unit 10, the remaining air passes directly through the space 131 and enters the self-heating unit 11 directly.
The air that has entered the air introduction cylinder 71 contributes to combustion as primary air regardless of which route is taken.

Further, the rotating shaft 21 of the motor 18 of the drive machine unit 5 communicates with the central shaft insertion holes 28 and 35 of the air amount adjusting unit 6 and passes through the air introduction cylinder 71 and the induction heating unit 10. To the inside.
The rotating shaft 21 of the motor 18 is engaged with the first rotating member 23 in the induction heating unit 10, more specifically in the fuel passage cylinder 75. The rotating shaft 21 of the motor 18 is engaged with the second rotating member 25 inside the self-heating unit 11.
That is, the rotating shaft 21 of the motor 18 of the drive machine unit 5 has a tip portion engaged with the second rotating member 25 and an intermediate portion engaged with the first rotating member 23. The first rotating member 23 is located in the fuel passage cylinder 75 of the induction heating unit 10, and the second rotating member 25 is located in the self-heating unit 11, both of which are rotated by the motor 18.

Further, since the rotating shaft 20 on the rear end side of the motor 18 is also connected to the fan 13, in this embodiment, the two rotating members 23 and 25 of the vaporizing unit 8 and the three of the fan 13 are operated by the single motor 18. Is driven.
Since the shaft insertion holes 28 and 35 are also the rotation center of the moving side plate-like member 26, they do not move when the moving side plate-like member 26 rotates. Therefore, even if the shaft insertion holes 28 and 35 have the rotation shaft 21 of the motor 18, the rotation of the moving side plate member 26 is not hindered.

Next, the function of the combustion apparatus 1 of the present embodiment will be described.
In the combustion apparatus 1 of the present embodiment, the motor 18 is activated to rotate the fan 13, the first rotating member 23, and the second rotating member 25.
By the rotation of the fan 13, air is sucked from the opening 15 provided in the central portion of the housing 12 of the blower 3 as indicated by the arrow in FIG. 9, and the air enters the driving machine unit 5. The air flows from the drive machine unit 5 to the vaporization unit 8 and the combustion unit 7 through the upper air amount adjustment unit 6. In this embodiment, the flow rate is adjusted by the air amount adjustment unit 6. That is, the amount of air flowing to the vaporization unit 8 and the combustion unit 7 side is adjusted by operating the step motor 38 and rotating the moving side plate member 26 relative to the fixed side plate member 27 to change the opening area. The

The air that has passed through the air amount adjusting unit 6 is divided into one that contributes to combustion as primary air and one that contributes to combustion as secondary air. In other words, the air that has passed through the central area of the air amount adjusting unit 6 is directly captured by the air introduction cylinder 71, a part of which enters the fuel passage cylinder 75 and is mixed with the fuel gas, and the remaining part is directly Into the self-heating part 11 is mixed with fuel gas.
Further, as shown in FIG. 15, the remaining portion of the blast flows across the flame hole base 43 from the elongated holes 48 provided in a row in the flow dividing member 41, and burns through the round holes 60 of the flame hole member 45. Part 7 is reached.

As described above, a large amount of primary air is introduced into the vaporizing unit 8 by the blower of the blower 3, and the inside of the fuel passage cylinder 75 of the induction heating unit 10 and the self-heating unit 11 are made to be a ventilation atmosphere.
In addition, a high-frequency current is supplied from a high-frequency inverter (not shown) to the coil wire 91 of the induction heating unit 10 to cause the fuel passage cylinder 75 as the induction heating unit 10 to generate heat by the principle of high-frequency induction heating.

That is, when a high-frequency current is passed through the coil wire 91, a fluctuating magnetic field is generated inside the coil, and magnetic lines of force that fluctuate through the fuel passage cylinder 75 placed in the fluctuating magnetic field penetrate. Here, since the fuel passage cylinder 75 is made of stainless steel and has conductivity, an eddy current is generated inside the fuel passage cylinder 75. As described above, since the fuel passage cylinder 75 is made of stainless steel and has a considerable electric resistance, the fuel passage cylinder 75 generates heat due to Joule heat caused by eddy current.
Further, the heat generated by high frequency induction heating has high thermal efficiency and rises in temperature early. Therefore, the temperature of the fuel passage cylinder 75 is raised in an extremely short time compared to the case where a conventional electric heater is used, and reaches a temperature at which liquid fuel can be vaporized.

In the present embodiment, when the fuel passage cylinder 75 is heated by high frequency induction heating, a contrivance is made so that the coil wire 91 does not rise in temperature.
That is, when the coil wire 91 for induction heating is provided inside the combustion apparatus 1 as in the present embodiment, the coil wire 91 is heated by the internal heat, which may cause a disconnection or the like. Therefore, in this embodiment, the coil wire 91 is devised so as not to be heated excessively.
That is, in this embodiment, the coil wire 91 is wound around the bobbin 90. However, the bobbin 90 is made of resin and does not generate heat because it is not conductive. The bobbin 90 is made of unsaturated polyester having heat insulation and heat resistance. Therefore, the bobbin 90 functions as a heat insulating material and does not transmit the heat of the fuel passage cylinder 75 to the coil wire 91.

Further, a heat insulating material (cylindrical heat insulating material 76) that does not generate heat and has excellent heat insulating properties is interposed between the bobbin 90 and the fuel passage cylinder 75.
The fuel passage cylinder 75 has a flange portion 83, and a donut-shaped heat insulating material 73 and a flange portion 93 of the bobbin 90 exist between the flange portion 83 and the coil wire 91, and the temperature of the coil wire 91 is increased. Is preventing.
Further, in this embodiment, since the primary air flows outside the induction heat source section 9 as will be described later, the coil wire 91 is also cooled by the primary air.

As described above, the coil wire 91 is energized, the fuel passage cylinder 75 is heated by high frequency induction heating, and the entire inner wall of the fuel passage cylinder 75 is heated. In this state, kerosene is dropped from the fuel pipe 116 onto the first rotating member 23.
The dropped kerosene receives centrifugal force from the first rotating member 23 and scatters toward the preliminary heat generating peripheral wall 64 of the fuel passage cylinder (induction heat generating portion) 75. The first rotating member 23 employed in the present embodiment is formed by extending the stirring blades radially from the outer edge of the plate body that rotates integrally with the rotation shaft extending in the vertical direction. A plurality of them are provided along the outer edge of the plate, and are inclined by a predetermined angle with respect to the plate.

Therefore, the liquid fuel sprayed on the surface of the plate body of the first rotating member 23 flows on the surface of the plate body by centrifugal force, and partly flows along the surface of the inclined stirring blade and from the tip of the stirring blade. It scatters toward the preliminary heat generating peripheral wall 64 of the fuel passage cylinder 75.
Therefore, if the tip of the stirring blade is positioned in the rotational axis direction (vertical direction) with respect to the plate body, the liquid fuel can be dispersed and scattered from the portion located above or below the plate body. In addition, the thermal energy of the inner peripheral wall of the vaporization part can be efficiently added to the scattered liquid fuel to promote vaporization.

Then, the scattered kerosene comes into contact with the inner surface of the fuel passage cylinder 75 disposed around the first rotating member 23 and is vaporized by receiving heat. At this time, the liquid fuel in contact with the fuel passage cylinder 75 is almost completely vaporized, and the liquid fuel does not remain without being vaporized.
Further, as described above, a part of the air trapped in the air introduction cylinder 71 passes through the inside of the fuel passage cylinder 75, so that the fuel vaporized by receiving heat from the inner surface of the fuel passage cylinder 75 passes through the fuel passage cylinder 75. Mixed with passing air.

Here, in this embodiment, since the first rotating member 23 is provided with the stirring blade, the air in the fuel passage cylinder 75 is stirred by the stirring blade provided on the inner surface of the first rotating member 23, and the fuel gas and Mixing with air is promoted.
In the present embodiment, since the fuel passage cylinder 75 is cylindrical, the scattered fuel and the vaporized fuel continue to be heated while passing through the cylindrical portion. In other words, in this embodiment, since the induction heat generating portion is cylindrical, the temperature of the heating is increased when the fuel passes through the cylindrical portion. Therefore, the combustion apparatus of the present embodiment has a long contact distance and contact time between the fuel and the heating element, which not only ensures the vaporization of the fuel but also raises the temperature of the vaporized fuel gas.

The mixed gas thus generated passes through the fuel passage cylinder 75 and enters the self-heating unit 11.
On the other hand, as described above, the remaining portion of the air trapped in the air introduction tube 71 passes through the space 131 formed between the inner surface of the air introduction tube 71 and the outer periphery of the induction heating unit 10, and thus the self-heating unit. Enter 11.
In this embodiment, a rotating member is also provided in the self-heating unit 11. That is, in this embodiment, the rotating member is provided in two stages, and the second rotating member 25 as one of the rotating members rotates in the self-heating unit 11.
Therefore, the mixed gas of fuel gas and air that has entered the self-heating unit 11 is again stirred and mixed by the second rotating member 25.

In particular, in this embodiment, the tip end side of the fuel passage cylinder 75 is narrowed, and the fuel gas mixed and stirred by the first rotating member 23 collides violently with each other when passing through the tip of the narrow fuel passage cylinder 75. , Mixing proceeds. Then, the fuel gas is blown into the second rotating member from a narrow portion and is stirred again by the second rotating member 25. The fuel gas is also mixed with the air newly passing through the space 131 and introduced into the self-heating part 11 in the self-heating part 11.
The fuel gas thus generated and further mixed with the primary air flows downstream through the gap 138 formed by the outer wall of the second rotating member 25 and the inner peripheral surface 66 of the self-heating portion 11 as shown by the arrow in FIG. Head for. That is, the mixed gas once flows upward along the cylindrical inner peripheral surface 66 of the self-heating portion 11. Here, since the outlet side of the air introduction cylinder 71 is near the opening of the self-heating unit 11, the flow path of the mixed gas is extremely narrow. Therefore, the stirring of the mixed gas further proceeds at the site.

  The air thus supplied from the air introduction cylinder 71 to the inside of the self-heating unit 11 is mixed with the scattered fuel, becomes a high temperature state, and is discharged from the opening 140 at the top of the self-heating unit 11. The mixed gas exiting the self-heating unit 11 flows into the flame hole base 43.

Then, the mixed gas is discharged from a flame hole (small hole 61) provided in the lower part of the flame hole base 43.
As described above, in the combustion apparatus 1 of the present embodiment, the liquid fuel is vaporized in the vaporization unit 8 and flows through the flame hole base 43 and is released from the flame hole (small hole 61). Since the temperature of the fuel gas at is high, it does not reliquefy until it reaches the flame hole (small hole 61).

On the other hand, air that has flowed downstream from other parts flows directly into the combustion unit 7 without being mixed with fuel, and contributes to combustion as secondary air.
When the fuel gas is ignited by an ignition device (not shown), a downward flame is generated from the flame hole (small hole 61).

  Here, in the combustion apparatus 1 of the present embodiment, the vaporization unit 8 is directly exposed at the center of the combustion unit 7, and therefore, when combustion is started, the self-heating unit 11 is heated by the flame. Therefore, the temperature in the self-heating part 11 rises and fuel vaporization is further promoted.

When combustion is performed for a predetermined time and the temperature of the self-heating unit 11 is sufficiently raised,
The energization to the coil wire 91 of the induction heating unit 10 is stopped, and the induction heating is finished. Thereafter, the fuel is vaporized by relying only on the heat generated by the self-heating unit 11.

In other words, when induction heating is stopped, the temperature of the fuel passage cylinder 75 serving as the induction heating unit 10 decreases, and vaporization in the induction heating unit 10 is hardly performed, and the fuel is vaporized only by the self-heating unit 11 substantially. .
The liquid fuel that is not vaporized by the induction heating unit 10 travels along the inner surface of the fuel passage cylinder 75 and reaches downward due to gravity. Here, in the present embodiment, a bowl-shaped groove 87 is formed at the lower end of the fuel passage cylinder 75. Therefore, the fuel that has fallen along the inner surface of the fuel passage cylinder 75 is collected in the lower groove 87. Further, in this embodiment, since the opening 85 on the lower side is inclined, the groove 87 at the end is also inclined, and the collected fuel flows in the groove 87 and collects further downward. In this embodiment, since the opening 88 is provided at the lowermost part of the groove 87, the fuel that has flowed through the groove 87 finally drops from the opening 88 formed at the lowermost part of the groove 87.

  Here, since the opening 88 provided in the fuel passage cylinder 75 is open above the second rotating member 25 and in the vicinity of the center of the second rotating member 25, the fuel dropped from the opening 88 is always constant. It falls to the position and comes into contact with the second rotating member 25. More specifically, all the fuel that has not been vaporized is dripped intensively onto the central portion of the second rotating member 25, and is caught and scattered by the second rotating member 25.

The scattered fuel collides with the inner peripheral surface 66 of the self-heating unit 11 and is vaporized by receiving heat from the self-heating unit 11.
In addition, it is mixed with the air that flows in and out of the air introduction cylinder 71 and enters the self-heating unit 11.
A part of the fuel spills from the second rotating member 25 before being scattered by the centrifugal force, but the fuel that has fallen in this way comes into contact with the bottom surface portion 67 of the self-heating unit 11 and is vaporized by receiving heat. .
And the air in the self-heating part 11 is stirred by the blade | wing part provided in the inner surface of the 1st rotation member 23, and mixing with fuel gas and air is accelerated | stimulated.
The subsequent flow of the fuel gas is as described above, and is discharged from the opening 140 at the top of the self-heating unit 11 in a high temperature state. The mixed gas that has exited the self-heating portion 11 once flows into the passage on the upper side of the flame hole base 43, is discharged from the flame holes (small holes 61) of the flame hole base 43, and burns.

It is a schematic diagram which shows the structure of the vaporization part periphery of the vaporization type combustion apparatus which concerns on embodiment of this invention. It is a flow-path system diagram of the hot water supply apparatus incorporating the combustion apparatus of FIG. It is a flowchart which shows the control implemented with the combustion apparatus of FIG. It is a flowchart which shows the detail of the control during combustion in the control shown in FIG. It is explanatory drawing which shows the temperature of the vaporization part in control of the vaporization transition mode shown in FIG. 3 corresponding to the time chart which shows the operation state of each part. It is explanatory drawing which shows the temperature of the vaporization part in control of the vaporization compensation mode shown in FIG. 3 corresponding to the time chart which shows the operation state of each part. 4 is a flowchart showing a modification of control during combustion in the control shown in FIG. 3. It is explanatory drawing which shows the temperature of the vaporization part in control of the vaporization transition mode shown in FIG. 7 corresponding to the time chart which shows the operation state of each part. It is sectional drawing of the specific Example of the vaporization type combustion apparatus which concerns on embodiment of this invention. It is a disassembled perspective view showing the whole component structure of the combustion apparatus shown in FIG. It is a disassembled perspective view of the vaporization part periphery of the combustion apparatus shown in FIG. It is a perspective view of the fuel passage cylinder which comprises the induction heating part of the vaporization part of the combustion apparatus shown in FIG. FIG. 10 is a front view, a plan view, a left and right side view, and a bottom view of a fuel passage cylinder that constitutes an induction heating section of a vaporization section of the combustion apparatus shown in FIG. 9. It is a partial cross section perspective view of the induction heating part of the vaporization part of the combustion apparatus shown in FIG. It is the perspective view which looked at the combustion part vicinity of the combustion apparatus shown in FIG. 9 from the top. It is sectional drawing of the vaporization part employ | adopted with the combustion apparatus of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vaporization type combustion apparatus 7 Combustion part 8 Vaporization part 10 Induction heating part 11 Self-heating part 13 Blower (fan)
77 Electromagnetic induction heating means (induction coil)
100 Induction heating part temperature detection means 115 Self-heating part temperature detection means 200 Control means (control circuit part)
To vaporization temperature T3 first vaporization temperature T4, T4 ′ upper limit temperature T5 lower limit temperature T6 second vaporization temperature T7 compensation temperature T8 energization stop temperature

Claims (9)

A vaporizing unit that heats and vaporizes the liquid fuel ; and a blowing unit that supplies air; and the air supplied from the blowing unit and the fuel gas vaporized in the vaporizing unit are mixed and supplied to the combustion unit , In the vaporization combustion device to burn,
The vaporizing unit generates heat by electromagnetic induction heating means, and an induction heating unit to which liquid fuel is supplied ;
A self-heating part that is located downstream of the induction heating part, provided with an opening on the induction heating part side, and that mainly raises the temperature by receiving heat from the combustion part;
A rotating member that is disposed in the self-heating unit and scatters the liquid fuel supplied through the induction heating unit and performs stirring and mixing of the gas in the self-heating unit,
An induction heating part temperature detecting means for detecting the temperature of the induction heating part;
Self-heating part temperature detecting means for detecting the temperature of the self-heating part;
And a control means for controlling each unit including control of the electromagnetic induction heating unit,
The control means continues the energization control while reducing the energization power of the electromagnetic induction heating means according to the temperature rise of the self-heating part, from vaporization by the induction heating part alone or from both the induction heating part and the self-heating part. And a vaporization transition mode in which the liquid fuel is vaporized in both the induction heating unit and the self-heating unit , the combustion is performed in the combustion unit, and the self-heating unit shifts to vaporization with the temperature rise of the self-heating unit. A vaporizing combustion apparatus characterized by that. A vaporizing section for heating and vaporizing the liquid fuel; and a blowing means for supplying air; mixing the air supplied from the blowing means and the fuel gas vaporized in the vaporizing section; In the vaporization combustion device to burn,
The vaporizing section includes an induction heating section that generates heat by electromagnetic induction heating means;
A self-heating unit that is located downstream of the induction heating unit and mainly receives the heat of the combustion unit to raise the temperature;
An induction heating part temperature detecting means for detecting the temperature of the induction heating part;
Self-heating part temperature detecting means for detecting the temperature of the self-heating part;
Control means for controlling each part including control of the electromagnetic induction heating means,
Part of the air supplied from the blowing unit is supplied to the flow path passing through the induction heating unit and enters the self-heating unit, and the other part of the air supplied from the blowing unit is the induction heating unit. Is supplied to the self-heating unit without passing through
The control means continues the energization control while reducing the energization power of the electromagnetic induction heating means in accordance with the temperature rise of the self-heating part, from vaporization by the induction heating part alone or from both the induction heating part and the self-heating part. And a vaporization transition mode in which the liquid fuel is vaporized in both the induction heating unit and the self-heating unit, the combustion is performed in the combustion unit, and the self-heating unit shifts to vaporization with the temperature rise of the self-heating unit. A vaporizing combustion apparatus characterized by that. The vaporization transition mode is executed when the self-heating unit is in a temperature region between a predetermined lower limit temperature lower than the vaporization temperature of the liquid fuel and a predetermined upper limit temperature higher than the vaporization temperature, and the control means 3. The vaporization type combustion apparatus according to claim 1 , wherein when the transition mode is started, the temperature of the induction heating unit is controlled to be lowered toward the vaporization temperature continuously or stepwise. In the vaporization transition mode, the control means sets the induction heat generating part continuously or stepwise during a period in which the self-heating part rises to a first vaporization temperature higher than the vaporization temperature and lower than the upper limit temperature. The temperature is controlled to be lowered toward the vaporization temperature and held at the vaporization temperature, and during the period in which the self-heating unit raises the temperature from the first vaporization temperature to the upper limit temperature, the induction heating unit is continuously or stepwise lowered. 4. The vaporization type combustion apparatus according to claim 3 , wherein the temperature lowering control is performed toward an energization stop temperature lower than the temperature. When the combustion amount increases during combustion, the control means energizes the electromagnetic induction heating means according to the temperature of the self-heating part to control the temperature of the induction heating part, and the induction heating part and the self-heating part both while performing combustion by vaporizing the liquid fuel of claims 1 to 4, further comprising a vaporization compensation mode for the transition to the self-heating of the temperature increasing again self-heating unit alone vaporized along with the The vaporization type combustion apparatus of any one of these. The vaporization compensation mode is executed when the self-heating portion is lower than a second vaporization temperature higher than the vaporization temperature of the liquid fuel when the combustion amount varies and the combustion amount after variation exceeds a predetermined value, 6. The vaporization type combustion apparatus according to claim 5 , wherein the temperature of the induction heating unit is controlled to rise to a predetermined compensation temperature in the vaporization compensation mode. When the self-heating unit exceeds the second vaporization temperature or the combustion amount becomes a predetermined value or less during execution of the vaporization compensation mode, the control means performs temperature increase control of the induction heating unit. The vaporization combustion apparatus according to claim 6 , wherein the vaporization combustion mode is stopped and the vaporization compensation mode is ended. The control means reduces the air supply amount by the blower in part or all of the control period of at least one of the vaporization transition mode and the vaporization compensation mode as compared with the air supply amount according to the combustion amount in the period or The vaporization type combustion apparatus according to any one of claims 1 to 7 , wherein the vaporization type combustion apparatus is increased. A vaporizing unit that heats and vaporizes the liquid fuel ; and a blowing unit that supplies air; and the air supplied from the blowing unit and the fuel gas vaporized in the vaporizing unit are mixed and supplied to the combustion unit , In the vaporization combustion device to burn,
The vaporizing part is heated the preliminary heating wall by the electromagnetic induction heating unit has a pre-heating the peripheral wall, and the induction heating unit the liquid fuel is supplied,
A self-heating unit that is arranged downstream of the induction heating unit and is provided with an opening on the induction heating unit side, and mainly receives the heat of the combustion unit to raise the temperature;
A rotating member that is disposed in the self-heating unit and scatters the liquid fuel supplied through the induction heating unit and performs stirring and mixing of the gas in the self-heating unit ;
The liquid fuel is scattered and vaporized toward the preliminary heat generating peripheral wall and flows to the downstream self-heating part side by supplying air from the blowing means, and the remaining liquid fuel flows to the self-heating part and is scattered by the rotating member to self-heat. It is configured to be heated and vaporized in the part,
In addition, control of each part including control of the induction heating part temperature detection means for detecting the temperature of the induction heating part, the self heating part temperature detection means for detecting the temperature of the self heating part, and the electromagnetic induction heating means is performed. With control means,
The control means continues the energization control while reducing the energization power of the electromagnetic induction heating means according to the temperature rise of the self-heating part, from vaporization by the induction heating part alone or from both the induction heating part and the self-heating part. And a vaporization transition mode in which the liquid fuel is vaporized in both the induction heating unit and the self-heating unit , the combustion is performed in the combustion unit, and the self-heating unit shifts to vaporization with the temperature rise of the self-heating unit. A vaporizing combustion apparatus characterized by that.

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