JPH0619214B2 - Combustion device - Google Patents

Description

The present invention relates to a vehicle equipped with an internal combustion engine or the like, a vehicle such as a trailer, a home room, a drying room, a room such as an office, which is indirect or direct. The present invention relates to a combustion device applicable to a heating device, a drying device, a boiler, a water heater, a greenhouse, and the like.

[Conventional technology]

Conventionally, for example, for heating the interior of a vehicle, the cooling water of the internal combustion engine is taken out with a hot water pipe, and this is led to a heater device,
Some of them indirectly heat exchange to send warm air into the room to heat the room.

In addition, there is a heating system for an automobile that heats the interior of the vehicle by the amount of heat generated by burning fuel with a burner, that is, a combustor regardless of the internal combustion engine.

Further, there is an engine warm-up device that supplies the fuel gas of the combustor to the intake port of the engine through the heat exchanger and guides the air heated by the heat exchanger to the passenger compartment.

As the prior art, for example, a combustor disclosed in Japanese Patent Application No. 61-087263 (see Japanese Utility Model Application Laid-Open No. 62-198322), which is a prior application by the present applicant, and Japanese Patent Application No. 61-257474 (Japanese Patent Application No. 61-257474). There is a combustion control device for a heater as disclosed in JP-A-63-113221).

The one described in Japanese Utility Model Laid-Open No. 62-198322 will be briefly described with reference to FIG. In the combustor 60 shown in FIG. 4, a combustion plate 61 is divided into a vaporization chamber 64 and a combustion chamber 66 by a partition plate 62 having an opening 63, and the vaporization chamber 64 is located above the combustion chamber 61 and the combustion chamber is located below the combustion chamber 61. The fuel injection pipe 70 of the vaporization device 65 which forms 66 and penetrates the combustion chamber 66 is opened to the vaporization chamber 64, and the vaporization chamber 64 is further provided with an ignition glow plug 67. This fuel device 60
Has an air introduction hole 68 formed in the lower portion of the combustion chamber 66,
A fuel gas outlet 69 is formed at the bottom of the combustion chamber 66.

Further, the combustion control device for a heater described in the above-mentioned Japanese Patent Laid-Open No. 63-113221 will be outlined. This combustion control device for a heater is provided with detection means for detecting the internal temperature of the combustor for burning the fuel, and control means for controlling the ignition means for the fuel based on the signal from the detection means. A flame sensor using a resistor having a temperature coefficient of resistance is used as the temperature detecting means, and a vaporizer for vaporizing the fuel and an igniter for igniting the vaporized fuel are provided as means for igniting the fuel. It is a thing.

[Problems to be solved by the invention]

However, in the case of performing indoor heating by using the cooling water of the internal combustion engine, it takes a long time for the heater body to send out warm air because the temperature rising speed of the cooling water is slow, and the heater is in the meantime. It has almost no heating function. Further, with respect to an automobile heating device or an engine warming device that uses a combustor regardless of the internal combustion engine, a combustion cycle, exhaust gas treatment, etc. require time and labor.
It has a problem that it requires a complicated mechanism and a control device.

In addition, as a prior art, the above-mentioned U.S.A. 62-198322.
The combustor 60 described in the publication is a vertical combustion cylinder 61, which makes the distribution of a mixture of air and vaporized fuel uniform, and causes a fuel pool due to incomplete combustion or poor vaporization. It is extremely satisfactory in terms of preventing the generation of the fuel or constructing a structure that does not easily generate it, and immediately vaporizing even if a fuel pool occurs, and safely burning the fuel, but the vaporized fuel is It does not disclose the technical idea of preventing the generation of carbon by liquefying and adhering the fuel in the combustion cylinder 61, particularly in the combustion chamber 66.

Further, in the combustion control device for a heater described in the above-mentioned Japanese Patent Laid-Open No. 63-113221, the combustion state inside the combustor changes depending on the electric resistance value of the flame sensor provided in the combustor during operation of the heater. Since the quality is checked and the re-ignition mode is selected, it is possible to re-ignite sufficiently even when using low-quality fuel, and the combustion of the fuel continues to obtain heating at the desired temperature.However, the ignition is stabilized. However, it cannot be said that the post-ignition combustion is performed well.

An object of the present invention is to eliminate the above-mentioned problems, and in a combustion device in which fuel is vaporized at a high speed, and the vaporized fuel is mixed with combustion air and burned, the combustion air is introduced into an air intake pipe. It is configured so that it can be easily introduced into the combustion cylinder from the periphery of the combustion cylinder smoothly and in a low resistance state, and a part of the combustion air is also introduced into the vaporization chamber, and in particular, the vaporized fuel is extremely good. Ignition, and ideally mix the vaporized fuel and combustion air in the vaporization chamber and combustion chamber to generate a mixture, and after ignition, send a larger amount of combustion air to the vaporization chamber to achieve good combustion. Therefore, it is an object of the present invention to provide a combustion device that prevents the generation of carbon that is likely to adhere to the wall surface in the combustion cylinder and is generated, and even if carbon is generated, fresh air is sent to completely burn the carbon.

[Means for solving problems]

The present invention is configured as follows to achieve the above object. That is, the present invention is directed to a combustion cylinder divided by a partition plate having openings in the vaporization chamber and the combustion chamber, an outer cylinder having an annular air introduction passage formed on the outer periphery of the combustion cylinder and connected to an air intake pipe, and a fuel injection cylinder. A vaporizer having an outlet opening in the vaporization chamber and penetrating the combustion chamber, an air introduction hole formed in the combustion cylinder for supplying combustion air to the combustion chamber, the vaporization chamber being adjacent to the vaporization chamber and passing through a bypass passage. An air blowing passage communicating with an air intake pipe, and a switching valve provided in the bypass passage and closed at the time of ignition and opened to directly supply combustion air from the air blowing passage to the vaporization chamber after ignition. It relates to a combustion device.

Further, in this combustion device, an air rectifying plate having an air guide hole is arranged in the annular air introducing passage.

Further, in this combustion device, the air blowing passage communicates with the vaporizing chamber through an air blowing hole formed in a cover plate that constitutes the vaporizing chamber.

Further, in this combustion device, the number and position of the air blowing holes are set so as to promote the swirling flow formed in the vaporization chamber.

Further, in this combustion device, the air introduction holes are formed in a large number of air introduction holes formed in the combustion cylinder located downstream of the air straightening plate and in the combustion cylinder located upstream of the air straightening plate. It is composed of an air introduction hole for promoting a swirling flow.

Further, in this combustion device, the air introduction hole for accelerating the swirl flow is inclined to the combustion cylinder along the swirl streamline so as to promote the swirl flow in the combustion cylinder, and the circumference of the combustion etc. It is formed in a partial area in the direction.

[Action]

The combustion apparatus according to the present invention is configured as described above and operates as follows. That is, this combustion device divides a combustion tube into a vaporization chamber and a combustion chamber, introduces combustion air into the vaporization chamber through the combustion chamber at the time of ignition, and directly burns the vaporization chamber after ignition. Since a means for introducing working air is provided, during ignition, the vaporization chamber is vaporized to a mixture generation zone in a natural circulation flow caused by a pressure difference due to an air flow balance, that is, a pressure difference generated between the combustion chamber and the vaporization chamber. Can send fuel mist.

Therefore, the ignition can be stabilized without increasing the velocity of the air flow so much, and when the fuel increases and the temperature rises, the air flow to the vaporization chamber, that is, the combustion air is further increased and the combustion is performed. Can flourish.

Further, the liquid fuel is immediately and rapidly vaporized into vaporized fuel by the vaporizer, and is jetted into the vaporization chamber.
Combustion air easily enters smoothly into the combustion or the like from the annular air introduction passage around the combustion cylinder in a low resistance state, and further vaporized fuel and combustion air can be mixed well in the combustion chamber. The air-fuel mixture can be produced satisfactorily.

Also, a portion where vaporized fuel is liquified and carbon is easily generated,
That is, fresh air is introduced along the swirl flow, that is, so as to promote the swirl flow, by the air introduction hole located upstream of the air straightening plate, and the generation of carbon can be prevented or the generated carbon can be completely burned. it can.

Further, since an air intake pipe is attached to the outer cylinder in the radial direction thereof, and the air rectifying plate is provided with a large number of air guide holes, the combustion air taken in from the air intake pipe is The air is dispersed in the annular air introduction passage and guided by each of the air guide holes, and then is fed into the air introduction hole from the entire circumference of the combustion cylinder, and is introduced into the combustion chamber in an ideal state.

〔Example〕

An embodiment of a combustion apparatus according to the present invention will be described below with reference to the drawings.

In FIG. 1, a combustion device according to the present invention is indicated generally by the numeral 10. With respect to the combustion device 10, for example, air taken in through an air cleaner of a diesel engine or a gasoline engine, a single air cleaner, or the like, or air taken in directly from outside air or a room is introduced from an air intake pipe 12 to The combustion gas is sent directly from the combustion gas delivery pipe 13 into a room or the like, or is sent to a heat exchanger (not shown) installed downstream. When sending out to the heat exchanger installed downstream, it goes without saying that the heat exchanger may be installed in series downstream of the combustion apparatus 10 or may be installed on the outer circumference of the combustion apparatus 10. is there.

The combustion device 10 includes a ceramic combustion cylinder 11, a metal outer cylinder 14 that covers the outer circumference of the combustion cylinder 11, and a metal lid plate 5 that seals one end of the combustion cylinder 11 and the outer cylinder 14 and forms a vaporization chamber 7. It consists of At the other end of the outer cylinder 14, a metal combustion gas delivery pipe 13 is provided. Also,
The outer cylinder 14 has an air intake port 4, and a metal air intake pipe 12 is attached to the tubular portion in which the air intake port 4 is formed. The air intake pipe 12 is attached in a radial direction of the outer cylinder 14, that is, perpendicular to the outer cylinder 14. Alternatively, the air intake pipe may be tangentially attached to the outer cylinder 14.

The interior of the combustion cylinder 11 is divided into two chambers, that is, a vaporization chamber 7 and a combustion chamber 6 by a partition plate 8 having a plurality of cutout passages and other air circulation openings 15 in the peripheral portion. Further, a large number of air introduction holes 17 are formed in the downstream portion of the peripheral wall of the combustion cylinder 11 that constitutes the combustion chamber 6. An annular air introducing passage 27 is formed between the combustion cylinder 11 and the outer casing 14 so that the combustion air swirls therethrough. Further, the annular air introducing passage 27 includes
An air rectifying plate 16 is installed.

The air straightening plate 16 is composed of an annular air guide plate having a large number of air guide holes 9, and uniformly or evenly disperses the combustion air introduced from the air intake pipe 12 in the annular air introduction passage located next. Combustion air is introduced into 27 evenly. In some cases, the combustion air may be introduced in an uneven manner to promote the swirling flow in the combustion cylinder 11.

A combustion gas delivery port 18 is formed in the end portion of the combustion chamber 6 on the side opposite to the vaporization chamber 7 so as to be radially offset.
By arranging the combustion gas delivery port 18 in a biased state in the radial direction, the combustion gas is favorably heat-exchanged (not shown).
Can be sent to.

The vaporizer 2 obliquely extends from the downstream corner of the combustion cylinder 11 toward the communication hole 1 formed in the central portion of the partition plate 8 in the combustion chamber 6
The fuel injection port 23 of the vaporizer 2 is opened in the vaporization chamber 7. Further, an ignition glow plug 3 which is a heating plug is installed in the vaporization chamber 7.

The vaporizer 2 has a vaporization glow plug 29 built in a metal vaporization pipe 20. Vaporization pipe 20
A vaporization glow plug 2 that is a heating plug is attached to one end of the
A terminal 21 for supplying current to a resistance wire (not shown) made of tungsten or the like embedded in the silicon nitride member in FIG.
Is located. At the other end of the vaporizing pipe 20, a jetting pipe 22 having a smaller diameter than the vaporizing pipe 20 is attached,
A fuel ejection port 23 is formed at the tip of the ejection pipe 22.

Further, the vaporization pipe 20 is provided with a fuel supply pipe 24. Further, heat receiving fins 28 are formed on the outer peripheral surface of the vaporization pipe 20. A jet pipe 22 extends from the tip of the vaporization pipe 20, the jet pipe 22 penetrates a communication hole 19 formed in the partition plate 8, and the fuel jet formed at the tip of the jet pipe 22 is further injected. The outlet 23 is located near the ignition glow plug 3 installed in the vaporization chamber 7 and opens.

In the combustion device 10, the material of the combustion cylinder 11 that forms the vaporization chamber 7 and the combustion chamber 6 is a dense or porous ceramic member having a low coefficient of thermal expansion. For example, cordierite may be used as a ceramic material to make the structure porous, and the material may be made of a material having a small coefficient of thermal expansion, or silicon nitride, silicon carbide, or the like.
Furthermore, it goes without saying that the lid plate 5 of the vaporization chamber 7 may be provided with a dense or porous ceramic member (not shown) having a low coefficient of thermal expansion.

This combustion device 10 is particularly characterized by the following configuration, and will be described with reference to FIGS. 1, 2, and 3. It should be noted that although the installation position of the air intake pipe 12 is different between FIG. 1 and FIG. 2, in FIG.
Air intake pipe 12, bypass passage 31, air blowing passage 2
6 and the air blowing hole 30 are shown in a shifted manner from the position of the air intake pipe 12 shown in FIG.

In this combustion device 10, a combustion cylinder 11 is connected to a vaporization chamber 7 and a combustion chamber 6.
The combustion air is introduced into the vaporization chamber 7 through the combustion chamber 6 at the time of ignition and the combustion air introduced directly into the vaporization chamber 7 is added after the ignition.

The configuration relating to the above control of the combustion device 10 is the combustion cylinder 1
The outer cylinder 14 is arranged on the outer periphery of the first air passage 1 to form the annular air introducing passage 27, and the annular air introducing passage 27 has a large number of air guide holes 9
An air rectifying plate 16 provided with (in particular, see FIG. 2) is arranged, and a large number of air introduction holes 1 and 17 for communicating the annular air introduction passage 27 and the combustion chamber 6 are formed in the combustion cylinder 11 to introduce the annular air introduction. The air intake pipe 12 is connected to the passage 27, and the switching valve 32 is connected.
And a bypass passage 31 communicating with the vaporization chamber 7 and communicating with the air intake pipe 12.

In this combustion device 10, the bypass passage 31 communicates with the vaporization chamber 7 through an air blowing hole 30 formed in the cover plate 5 that constitutes the vaporization chamber 7, and the air blowing hole 30 serves as the vaporization chamber 7.
The number, position, size, etc. are determined so as to promote the swirling flow formed in (1) (in particular, refer to FIG. 3).

At the time of ignition, the switching valve 32 of the bypass passage 31 is closed, the combustion air is introduced into the combustion chamber 6 through the air introduction holes 1 and 17 formed in the combustion cylinder 11, and the combustion air introduced into the combustion chamber 6 is discharged. A part is introduced into the vaporization chamber 7.

Next, after ignition, the switching valve 3 in the bypass passage 31
2, the combustion air is introduced into the vaporization chamber 7 through the combustion chamber 6, and the vaporization chamber 7 is introduced from the air blowing hole 30 through the bypass passage 31 and the air blowing passage 26 formed by the lid plate 5 and the outer lid 25. Combustion air is blown directly into. Further, in order to introduce air into the combustion chamber 6 in the combustion cylinder 11, a large number of air introduction holes 17 are formed in the combustion cylinder 11 located downstream of the air rectifying plate 16 and combustion located upstream of the air rectifying plate 16. That is, the air introduction hole 1 for accelerating the swirling flow is formed in the cylinder 11.

Combustion air and combustion gas flowing through a large number of air introduction holes 17 form a swirl, that is, a swirl flow that flows between the combustion chamber 6 and the vaporization chamber 7 in the combustion cylinder 11, but the swirl flow promotion air is used. The introduction holes 1 have the number, position, inflow angle, etc. of the air introduction holes 1 determined with respect to the combustion cylinder 11 so as to promote this swirling flow.

For example, as shown in FIG. 2, the swirling flow promoting air introduction hole 1 is formed in the combustion cylinder 11 so as to promote the swirling flow formed in the combustion cylinder 11, that is, an air flow line inside the combustion cylinder 11. It is formed in an inclined state along the swirl streamline. The swirling flow promoting air introduction hole 1 is also formed in a partial region of the combustion cylinder 11 in the circumferential direction. However, regarding the swirling flow of the combustion air, the combustion air in the combustion chamber 6 introduced from the air introduction hole 17 of the combustion cylinder 11 is, for example, a symbol A formed on the partition plate 8 (see FIG. 2). The gas flows into the vaporization chamber 7 through the air circulation opening 15 indicated by.

Next, the combustion air that has flowed into the vaporization chamber 7 together with the vaporized fuel that has been ejected from the fuel ejection port 23 through the air circulation opening 15 formed in the partition plate 8 (see FIG. 2) through the combustion chamber 6 Flows in. The swirling flow of the combustion air flows in the above-described direction over the vaporization chamber 7 and the combustion chamber 6 in the combustion cylinder 11.

By the way, in the case where the air introduction hole 1 for accelerating the swirl flow is not formed, the vaporized fuel which has once been vaporized is liquefied and the liquefied fuel is carbonized, and the lower portion of the combustion cylinder 11, that is, symbol B (see FIG. 2). ) Attached to the air circulation opening 15 part,
Alternatively, it becomes a trap and causes the generation of carbon.

However, in this combustion device 10, since the air introduction hole 1 for accelerating the swirling flow is formed over about 60% of the peripheral surface of the combustion cylinder 11 centering on the air circulation opening 15 indicated by the reference symbol B, the annular air introduction passage is formed. Fresh air, that is, fresh air, flows into the combustion chamber 6 from 27 through the air introduction hole 1.

Therefore, the swirling flow of the mixture of combustion air and vaporized fuel in that part is promoted, and even if carbon is generated, it is blown away by the swirling flow promoted, or carbon is burned by fresh air and There is no phenomenon that carbon is blown up or carbon adheres.

Next, the operation of the combustion device 10 will be described with reference to FIGS. 1, 2, 3 and 5 (1), 5 (2), 5 (3).
And it demonstrates with reference to FIG. 5 (4). Figure 5 (1),
FIG. 5 (2), FIG. 5 (3) and FIG. 5 (4) are process flow charts showing an example of the operation of the combustion apparatus 10.

It is determined whether or not the start switch is on, and if it is on, power is supplied from the battery to the electronic control unit, and the resistance value of the ignition glow plug 3 is set to change with temperature. Proceeding to step 51 of calculating a resistance value by passing a minute current through the glow plug 3 for ignition,
If it is not turned on, the process proceeds to step 92 (step 50).

The resistance value R of the ignition glow plug 3 is checked or measured by a signal from an ignition glow plug resistance detector using a comparator or the like (step 51).

It is judged whether or not the resistance value R of the ignition glow plug 3 is lower than a predetermined resistance value R ₁ , and if it is low, the routine proceeds to step 53 to promptly perform combustion vaporization, and if it is high, the routine proceeds to step 58 (step 52).

When the resistance value R is higher than the predetermined resistance value R ₁ , for example, when the internal temperature of the combustion device 10 is high due to the residual heat after use, the vaporization glow plug 29 can be sufficiently ignited without being heated. Therefore, the routine proceeds to step 58, where a conversion device or a fuel selection switch that changes the mode according to the difference in fuel type, that is, the normal fuel N (for example, No. 2 light oil) or the fuel S with good vaporization (for example, No. 3 light oil). The ignition glow plug 3 is turned on by detecting the position of, and then it is determined whether or not the resistance value R of the ignition glow plug 3 is lower than a predetermined resistance value R ₉₀₀ (steps 58, 59, 60).

When the resistance value R of the ignition glow plug 3 is higher than the predetermined resistance value R ₉₀₀ , the resistance changeover switch is switched to hold the predetermined resistance value R ₁ and the timer is operated to hold for a predetermined time. After turning on step 61
(Steps 67 and 68).

When the resistance value R of the ignition glow plug 3 is lower than the predetermined resistance value R ₉₀₀ , the fuel selection switch determines whether the fuel is the normal fuel N or the special fuel S because the fuel is being energized. When the fuel selection switch is the special fuel S, the routine proceeds to step 57, and when the fuel selection switch is the normal fuel N, the vaporization glow plug 29 is stably heated so that the energization of the vaporization glow plug 29 is maintained at a constant temperature. Then step 5
7 (steps 61 and 62).

Further, in step 52, the resistance value R is equal to the predetermined resistance value R.
_When it is lower than _1, that is, when the internal temperature of the combustion device 10 is low, the ignition glow plug 3 is turned on to the rapid heating circuit side (step 53).

Whether or not the resistance value R of the ignition glow plug 3 is lower than a predetermined resistance value R ₉₀₀ is determined by, for example, a bridge circuit. If it is low, the vaporization glow plug 29 is turned on, if it is high, the resistance changeover switch is switched to turn on the timer, and then the vaporization glow plug 29 is turned on. After the timer is turned on, it is automatically held for a predetermined time and then turned off (steps 54, 63, 64, 55).

It is judged whether or not the resistance value R _E of the vaporization glow plug 29 is lower than a predetermined resistance value R ₄₀₀ required for vaporization, and if it is low, the routine proceeds to step 57, and if it is high, the resistance changeover switch is switched and the timer is turned on. And then to step 57. After the timer is turned on, it is automatically held for a predetermined time and then turned off (steps 56, 65, 66).

The fuel switch is turned on to send the liquid fuel to the vaporizer 2 (step 57).

Next, the heating blower of the heat exchanger that feeds the heating air is turned off, the combustion blower that feeds the combustion air to the combustion device 10 is throttled for a time during which ignition is stable, and then turned on so that steady combustion is performed. The timer for the combustion blower is turned on (steps 69, 70, 71).

When the operating time t of the combustion blower is shorter than the predetermined time t _s , the starting amount of the fuel switch is adjusted to increase the starting amount to facilitate ignition, and the operating time t is longer than the predetermined time t _s. In this case, the operation time is counted to confirm the ignitability (steps 72, 77, 73).

Then, a minute current is sent to a flame sensor having a characteristic that the resistance value changes according to the temperature, and whether the internal temperature T _FS of the combustion device 10 is higher than a predetermined temperature T ₃ by a signal that operates through a means for detecting the resistance value. If it is high, it is determined that the combustion state of the combustion device 10 is active, and the process proceeds to steps 75 and 81. If it is low, the process proceeds to step 78 (step 74).

When the internal temperature T _FS of the combustion device 10 is higher than the predetermined temperature T ₃ , the combustion is stable, so the switching valve 32 controlled by a solenoid valve or the like is opened, and the combustion air is sent to the bypass passage 31. Combustion air is sent into the vaporization chamber 7 through the air blowing hole 30 of the lid plate 5 that constitutes the vaporization chamber 7, and the combustion cylinder 11
In addition to sending combustion air in a direction that promotes the flow of a swirl flow formed in the vaporization chamber 7 and the combustion chamber 6 in
The heating blower is turned on, and the heating air is sent to a predetermined location, for example, the passenger compartment of the vehicle (steps 81, 7).
5).

Further, when the internal temperature T _FS of the combustion device 10 is lower than the predetermined temperature T ₃ , the fuel selection switch automatically converts the special fuel S into the normal fuel N. For example, the fuel is converted into a special fuel S, and the number of operations N is counted by the counter. When the number of operations N is smaller than the predetermined number of operations N ₁ , the process returns to step 50, and when the number of operations N is larger, the signal is processed as an abnormal signal, and the process following step 92 Proceed to (steps 78, 79, 80).

By a heat exchanger sensor detects the heat exchanger temperature T _HE,
It is determined whether the temperature is lower than the predetermined temperature value T ₅ , and if it is lower, the process proceeds to step 82, and if it is higher, it is processed as an abnormal signal and the process proceeds to step 80 (steps 76 and 80).

The signal is detected by the heating position switch set to the desired heating temperature, and it is determined whether the heating position is 1st. If 1st, the process proceeds to step 87, and otherwise, the process proceeds to step 83 ( Step 82).

When the heating position is 1st, the combustion blower is 1
Since it is set to st, the fuel flow rate is controlled to 1st, the fuel flow rate is sent to the vaporizer 2, and the heating blower is controlled to 1st (steps 87 and 88).

The signal is detected by the heating position switch set to the desired heating temperature, it is determined whether the heating position is 2nd, and if it is 2nd, the process proceeds to step 84, otherwise, that is, 3rd, the step is performed. 89
(Step 83).

If the heating position is 2nd, use 2 combustion blowers.
Set by switching to nd, control the fuel flow rate to 2nd,
The fuel flow rate is sent to the vaporizer 2 and the heating blower is controlled to 2nd (steps 84, 85, 86).

When the heating position is 3nd, the combustion blower is 3
rd is switched and set, the fuel flow rate is controlled to 3rd,
The fuel flow rate is sent to the vaporizer 2 and the heating blower is controlled to 3rd (steps 89, 90, 91).

Fuel flow 1st, 2nd, blowing hot air temperature T _A corresponding to each of the 3rd, it is determined whether or higher than the predetermined warm-air temperature T _4, in the case high performs a process of stopping the operation of the combustion device 10, If it is lower, the process returns to the process next to step 75, and the following processes are repeated (step 92).

When the blown-out warm air temperature T _A is higher than the predetermined warm air temperature T _{4, the} temperature of the vehicle compartment, the room, etc. to be heated is high, and it is not necessary to warm the heating air.
Stop the operation of 0.

Specifically, since it is not necessary to introduce combustion air into the vaporization chamber 7, the switching valve 32 is provided to shut off the bypass passage 31.
Is closed to prevent the combustion air from being blown into the vaporization chamber 7 from the air blowing hole 30. Turn off the heating blower,
Stop sending the heating air from the heat exchanger into the room.

Further, in order to stop sending the liquid fuel to the vaporization device 2 and suck out the fuel accumulated in the vaporization device 2, the fuel supply pump is reversely rotated, and after being reversely operated for a predetermined time, the fuel supply pump The operation is stopped or turned off. From the air introduction holes 1 and 17 formed in the combustion cylinder 11 to the combustion chamber 6
The operation of the combustion blower is stopped or turned off in order to stop sending the combustion air into it (steps 93, 94,
95, 96, 97).

It is determined whether the start switch is off, and if it is on, the process returns to the first step 50, and the control of the combustion device 10 is repeated. If it is off, the process proceeds to step 99 (step 98).

If there is a problem with the fuel system and fuel should not flow out, check the resistance value R of the vaporization glow plug 29, turn on the vaporization glow plug 29, and if the fuel is not accumulated, vaporize it. Since the resistance value R _E1 + R _e is higher than the set resistance value R _E1 of the glow plug 29 for normal use, it is normal, and if it is low, it means that fuel is present, so the subcock is closed (steps 99, 1).
00).

It is judged whether or not the resistance value R of the vaporization glow plug 29 is higher than the resistance value R _E1 + R _e higher than the set temperature. If it is higher, the process proceeds to step 102, and if it is lower, the process proceeds to step 103 as an abnormal signal ( Steps 101 and 10
2).

When the resistance value R of the vaporizing glow plug 29 is lower than the above set temperature resistance value _E1 + R _e, there is a possibility that the fuel supply is being performed, the complete fuel Sabukokku provided in the fuel supply system The glow plug 29 for vaporization is then heated and the resistance value R of the glow plug 29 for vaporization is closed.
Is higher than the resistance value R _E1 + R _e higher than the set temperature, and then the process proceeds to step 102 (step 103,
104).

The combustion device 10 is controlled by repeating each of the above processes.

As described above, the embodiment of the combustion apparatus according to the present invention has been described in detail, but the invention is not necessarily limited to these details, and for example, the processing steps in the above control can be variously changed, and The fuel device 10 can be changed according to the application object, for example, vehicle heating, household heating, dryer, greenhouse, or the like.

Further, although the combustion cylinder is a horizontal type installed in a substantially horizontal direction, it may be installed in an oblique direction, and it is needless to say that it can be changed according to conditions such as an installation place. Regarding the partition plate that partitions the inside of the combustion cylinder, instead of providing a plurality of air passage openings such as cutout passages at the peripheral edge portion, an air passage opening composed of a plurality of through holes is provided at an appropriate portion of the partition plate. You may comprise, or you may form the air circulation opening of both a notch passage and a through hole.

Further, a dense or porous ceramic member having a low coefficient of thermal expansion may be installed on the cover plate, and in the figure, the air intake pipe and the vaporizer are separated from each other by about 90 degrees (about 270 degrees from the opposite direction). However, it is needless to say that the positional relationship is not limited to this.

Further, in the drawing, the air guide holes provided in the annular air guide plate are circular and formed at equal intervals, but the shape is not limited to circular holes, and various shapes such as elliptical holes, elongated holes, and square holes may be used. , Also the air inflow velocity, without piercing at even distance intervals,
It can be variously changed according to the air inflow amount and the like, and it goes without saying that a large number of pores may be formed. Further, the air introduction hole formed in the combustion cylinder can be similarly changed in shape, size, and the like.

〔The invention's effect〕

The combustion device according to the present invention is configured as described above and has the following effects. This combustion device divides a combustion tube into a vaporization chamber and a combustion chamber, introduces combustion air into the vaporization chamber through the combustion chamber at the time of ignition, and further directly combusts air into the vaporization chamber after ignition. Since it is equipped with a means for introducing the vaporized fuel mist in the vaporization chamber at the time of ignition, the vaporized fuel mist in the gas mixture generation zone in the natural circulation flow caused by the pressure difference due to the air flow balance, that is, the pressure difference generated between the combustion chamber and the vaporization chamber. Can be sent.

Therefore, the ignition can be stabilized without increasing the velocity of the air flow too much, and when the fuel increases and the temperature rises, the air flow to the vaporization chamber is increased to promote the fuel and more actively. can do.

In particular, a bypass passage having a switching valve and communicating with the vaporization chamber is communicated with the air intake pipe, and the bypass passage is communicated with the vaporization chamber through an air blowing hole formed in a lid plate forming the vaporization chamber. Moreover, since the number, position, size, etc. of the air blowing holes are determined so as to promote the swirling flow formed in the vaporization chamber, the feeding of combustion air can be controlled extremely accurately and quickly. Moreover, the swirling flow formed in the combustion cylinder over the vaporization chamber and the combustion chamber can be promoted without obstruction, the generation of mist carbon can be prevented, and the combustion state can be improved.

Further, the liquid fuel is immediately and rapidly vaporized into vaporized fuel by the vaporizer, and is jetted into the vaporization chamber.
Further, the fuel air easily enters the combustion cylinder smoothly from the annular air introduction passage around the combustion cylinder in a low resistance state, and further, the vaporized fuel and the combustion air are mixed well in the combustion chamber. It is possible to satisfactorily generate an air-fuel mixture, and also to introduce a part of the combustion air into the vaporization chamber to ignite the vaporized fuel extremely well and surely, thereby making the combustion active. Moreover, the combustion gas can be vigorously sent out from the combustion chamber to a predetermined place, for example, a heat exchanger.

Also, a portion where vaporized fuel is liquified and carbon is easily generated,
That is, fresh air is introduced along the swirl flow, that is, so as to promote the swirl flow, by the air introduction hole located upstream of the air straightening plate, to prevent the generation of carbon, or to blow off or generate the generated carbon. The carbon can be completely burned.

Further, an air intake pipe is attached to the outer cylinder in the radial direction thereof, and the air rectifying plate has a large number of air guide holes, so that the combustion air taken in from the air intake pipe is , Dispersed in the annular air introduction passage and guided by each of the air guide holes, then fed into the air introduction hole from the entire circumference of the combustion cylinder and introduced into the combustion chamber in an ideal state. .

Further, since the vaporizer having the vaporization glow plug is arranged in the combustion cylinder, the liquid fuel is vaporized into vaporized fuel rapidly and surely by the vaporization glow plug at the beginning of combustion, When the vaporization glow plug is turned off, the heat of combustion is obtained from the combustion chamber to immediately produce vaporized fuel, and an ignition glow plug is arranged in the vaporization chamber. As a result, the vaporized fuel is ignited reliably and no ignition error occurs.

Therefore, according to this combustion device, the liquid fuel can be rapidly vaporized, and the vaporized fuel can be rapidly ignited and burned rapidly and surely, which contributes rapidly to heating and the like. is there.

[Brief description of drawings]

1 is a sectional view showing an embodiment of a combustion apparatus according to the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a sectional view showing an example of a prior art combustor, and FIG. 5 (1), FIG. 5 (2), FIG. 5 (3) and FIG. 5 (4).
FIG. 6 is a process flow chart showing an example of control of the combustion apparatus according to the present invention. 1, 17 ... Air introduction hole, 2 ... Vaporizer, 4 ... Air intake port, 6 ... Combustion chamber, 7 ... Vaporization chamber, 8 ... Partition plate,
9 ... Air guide hole, 10 ... Combustion device, 11 ... Combustion cylinder, 12 ... Air intake pipe, 14 ... Outer cylinder, 15 ...
Air circulation opening, 16 ... Air straightening plate, 19 ... Communication hole,
25 ... Outer cover plate, 26 ... Air blowing passage, 27 ... Annular air introducing passage, 30 ... Air blowing hole, 31 ... Bypass passage, 32 ... Switching valve.

Claims (6)

[Claims] 1. A combustion cylinder divided by a partition plate having openings in the vaporization chamber and the combustion chamber, an outer cylinder having an annular air introduction passage formed on the outer periphery of the combustion cylinder and connected to an air intake pipe, and a fuel jet. A vaporization device that opens into the vaporization chamber and penetrates the combustion chamber,
An air introduction hole formed in the combustion cylinder for supplying combustion air to the combustion chamber, an air blowing passage adjacent to the vaporization chamber and communicating with the air intake pipe through a bypass passage,
And provided in the bypass passage and closed at the time of ignition,
A combustion device having a switching valve that is opened to directly supply combustion air from the air blowing passage to the vaporization chamber after ignition. 2. The combustion device according to claim 1, wherein an air straightening plate having an air guide hole is arranged in the annular air introduction passage. 3. The combustion apparatus according to claim 1, wherein the air blowing passage communicates with the vaporizing chamber through an air blowing hole formed in a cover plate forming the vaporizing chamber. 4. The combustion device according to claim 3, wherein the number and position of the air blowing holes are set so as to promote the swirling flow formed in the vaporization chamber. 5. The air introducing hole includes a plurality of air introducing holes formed in the combustion cylinder located downstream of the air straightening plate and a swirl flow formed in the combustion cylinder located upstream of the air straightening plate. The combustion device according to claim 1, comprising an air introduction hole for promotion. 6. The swirl flow promoting air introducing hole is inclined along the swirl streamline in the combustion cylinder so as to promote the swirl flow in the combustion cylinder and in the circumferential direction of the combustion cylinder. The combustion device according to claim 5, which is formed in a partial region.