JP2000337608A - Combustion equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a lean-burn combustion system used for a heat source such as a hot water heater or a heater, a rich flame cannot stably surround a lean flame, and a fuel supply amount and a combustion are increased. An object of the present invention is to prevent a rich flame from becoming unstable when the amount of air changes, so that a light flame becomes unstable and CO or odor is not generated. SOLUTION: A lean flame formed by an excess air-lean mixture tends to be lifted, and the lean flame is maintained by a rich flame formed by an excess fuel-rich lean mixture. And the fact that the stability of the rich flame deteriorates due to the change in the combustion air amount and the rich flame cannot be maintained in the light flame can be prevented by the secondary air ejected from the outlet 36 of the secondary air port 35. In order to ensure the stability of the rich flame, the secondary air keeps the rich flame even if the amount of fuel supply or combustion air changes, and the rich flame keeps the light flame. By forming a stable flame, good combustion exhaust gas can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus used for a heat source such as a water heater or a heater.
The present invention relates to a lean-burn combustion apparatus for reducing x.

[0002]

2. Description of the Related Art A conventional combustion apparatus of this kind is disclosed in Japanese Patent Application Laid-Open No. H5-25-2.
There has been one described in Japanese Patent No. 96421. As shown in FIG. 10, this combustion device is provided with an inner tube 5 having a gap 3 provided therein and a dense gas flame hole 4 provided therein and having an inner tube 5 forming a light gas flame hole 1 on the upper surface. A tube 6 is formed, and a closing portion 7 for closing the fresh gas flame holes 1 at both ends in the longitudinal direction of the combustion tube 6 is provided.

[0003] Since the rich flame formed by the rich gas flame hole 4 spreads laterally in the closed portion 7 and surrounds the light flame formed by the light flame hole 1, the stability of the light flame is improved. And good flammability.

[0004]

However, in the above-described conventional combustion apparatus, the lean flame formed by the excess air-fuel mixture becomes a lift tendency, and the lean flame is surrounded by the rich flame formed by the excess fuel-rich mixture. In addition, a closed portion is provided at both ends in the longitudinal direction of the combustion tube to close the lean gas flame hole, and the rich flame spreads in the lateral direction so as to surround the lean flame so that the lean flame is maintained. When the supply amount or the combustion air amount changes, the stability of the rich flame deteriorates, so that it is not possible to hold the light flame, the light flame becomes a lift state, and the combustion exhaust gas generates CO and odor. .

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rich flame port for burning a rich mixture and a light flame port for burning a light mixture arranged in parallel to a vaporizing surface. A burner head having a secondary air port is provided, and a heat receiving rich flame port is provided below the heat receiving portion of the vaporizer, and the secondary air port, the rich flame port, the light flame port, and the rich flame port are arranged in this order. On the opposite side, the secondary air port and each of the light and shade flame ports are arranged in a plurality of rows.

[0006] According to the above invention, the lean flame formed by the excess air-lean mixture is lifted, but the flame is maintained by the rich flame formed by the excess-fuel rich mixture. And that the amount of combustion air changes and the stability of the rich flame deteriorates and the rich flame can no longer maintain the light flame. Since the stability is ensured, a stable flame is formed in both the rich flame and the lean flame, and as a result, a good combustion exhaust gas can be obtained.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be embodied in the form of the configuration described in each claim, and the configuration will be described below together with the operation and effect.

According to a first aspect of the present invention, there is provided a combustion apparatus comprising: a fuel supply unit for supplying a liquid fuel; a nozzle for ejecting the supplied liquid fuel;
A vaporizer having a vaporizing surface for vaporizing the liquid fuel ejected from the nozzle, a temperature detector for detecting a temperature of the vaporizer, a mixing chamber connected downstream of the vaporizer, and a mixing chamber. A burner head provided on the downstream side and connected to the vaporizer, a burner head case surrounding the burner head and forming a combustion chamber, a blower for supplying combustion air, and a liquid fuel ejected from the nozzle A vaporizer lid having an opening for guiding the combustion air supplied from the blower, wherein the burner head is provided with a rich flame port for burning a rich mixture disposed in parallel to the vaporizing surface; It has a light flame port for burning a light mixture and a secondary air port,
A heat-receiving rich flame port is provided below the heat-receiving section, a secondary air port,
The secondary air port and each of the light and shade flame ports are arranged in a plurality of rows in the order of the rich flame port, the light flame port, and the rich flame port.

Therefore, the lean flame formed by the excess air-lean mixture tends to be lifted, so that the lean flame is maintained by the rich flame formed by the excess-fuel rich mixture, and the fuel supply is performed. The amount of flame and the amount of combustion air change, and the stability of the rich flame deteriorates and the rich flame can no longer maintain the light flame. The rich flame is sustained by the secondary air injected from the secondary air port. Therefore, a stable flame can be formed in both the rich flame and the lean flame, and good combustion exhaust gas can be obtained.

In addition, since the heat-receiving rich flame port is disposed below the heat-receiving section in parallel with the vaporizing surface, the heat-receiving section emits combustion heat from the rich flame formed by the heat-receiving rich flame port during combustion. Heat can be received from the entire heat-receiving rich flame outlet below the heat-receiving part, so the amount of heat received is high, and the vaporizer can be set to the optimal vaporization temperature without increasing the heater capacity or extending the heater energization time. Power can be reduced.

According to a second aspect of the present invention, there is provided a combustion apparatus according to the first aspect, wherein a plurality of heat-receiving rich flame ports below the heat-receiving portion of the carburetor are continuously arranged.

Therefore, since the amount of heat received by the heat receiving section is proportional to the heat receiving area of the heat receiving section facing the burner head and the flame temperature, the amount of heat received is increased. Therefore, the length of the heat receiving section facing the burner head is increased. In contrast, by configuring a plurality of heat receiving rich flame ports having a high flame temperature in opposition thereto, the amount of heat received can be increased to reduce the power consumption of the heater. As the temperature rises, the heat-receiving rich flame may deform, but since it is composed of multiple rich flames, it prevents the heat-receiving rich flame from deforming due to the rise in the flame temperature and improves reliability. Can be enhanced.

According to a third aspect of the present invention, there is provided a combustion apparatus according to the first or second aspect, wherein a heat-receiving rich flame port is provided below the heat-receiving portion of the vaporizer, and a heat-intensifying flame outlet is provided below the tip of the heat-receiving portion.
This is a configuration in which a secondary air port is provided.

Therefore, the temperature of the vaporizer due to the heat received from the flame during combustion has a temperature gradient between the heat receiving portion and the vaporizing surface, and the portion of the heat receiving portion at the tip end facing the burner head has the highest temperature. The lower part of the heat receiving part is used as a heat receiving flame outlet, the lower part of the heat receiving part is used as a secondary air port, and the front end part of the heat receiving part is cooled by the air from the secondary air port so that the heat receiving part can be prevented from having a high temperature. The reliability of the vaporizer can be improved, and the amount of heat received can be secured by the rich flame of the rich flame opening for heat reception below the heat receiving section.

According to a fourth aspect of the present invention, in the combustion apparatus according to any one of the first to third aspects, the opening ratios of the rich flame port and the light flame port near the side wall portion of the burner head case are set near the center portion. It is a rougher configuration.

Since the opening ratio of the rich flame port and the light flame port near the side wall of the burner head case is made coarser than that near the center, the rich flame and the light flame formed by the rich flame port and the light flame port are reduced. This makes it possible to prevent the burner head case from becoming hot due to the coarse flame and the rich flame, thereby improving the reliability of the burner head case.

According to a fifth aspect of the present invention, in the combustion apparatus according to any one of the first to fourth aspects, the outlet of the secondary air port near the side wall of the burner head case is denser than the vicinity of the center. It is a configuration to do.

Since the outlet of the secondary air port near the side wall of the burner head case is made denser than the vicinity of the center, the secondary air blown out from the outlet forms near the side wall of the burner head case. By cooling the rich flame and the light flame and forming an air layer between the burner head case and the burner head case, it is possible to prevent the burner head case from becoming high in temperature, thereby improving the reliability of the burner head case.

According to a sixth aspect of the present invention, in the combustion device according to any one of the first to fourth aspects, the opening ratio of the heat-receiving rich flame outlet of the burner head below the heat-receiving portion is increased by the rich portion other than below the heat-receiving portion. It is a configuration that makes it denser than the flame.

Since the opening ratio of the heat-receiving rich flame port below the heat-receiving section is made denser than that of the heat-receiving rich flame port below the heat-receiving section, the rich flame formed by the heat-receiving rich flame port below the heat-receiving section becomes dense. The amount of heat received by the heat receiving section increases, and the vaporizer can be set to the optimum vaporization temperature without increasing the capacity of the heater or extending the energizing time of the heater, thereby reducing power consumption.

A combustion apparatus according to a seventh aspect of the present invention is the combustion apparatus according to any one of the first to sixth aspects, wherein a part of the light flame port is made non-porous.

In general, the fuel is ignited with a rich fuel-rich flame port which is easy to ignite, and the rich flame formed at the rich flame port is successively flared to form a rich flame and a light flame all over the burner head. However, since the light flame formed at the light flame port is composed of a light mixture with excess air, it is difficult for the light flame to ignite to the next rich flame port. By making the hole non-porous, the fire transfer from the ignited flame outlet to the rich flame outlet is completed in a short time, so that there is no ignition delay and no odor is generated, and good combustion characteristics are obtained. Can be

An eighth aspect of the present invention is directed to the combustion apparatus according to any one of the first to seventh aspects, wherein a part of the secondary air port is made non-porous.

The flame is ignited at the rich flame port, and the rich flame formed at the rich flame port is successively flared to form a rich flame and a light flame all over the burner head. Is not divided by the secondary air port, so that the fire transfer to the rich flame port far from the ignited flame port is completed in a short time,
Since no odor is generated due to ignition delay, good combustion characteristics can be obtained.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a combustion apparatus according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of a main part of the combustion device.

1 and 2, reference numeral 21 denotes a pump for supplying liquid fuel, 22 denotes a nozzle for ejecting the supplied liquid fuel, and 23 denotes an aluminum having a heater 24 for heating and vaporizing the liquid fuel ejected from the nozzle 22. It is a vaporizer made of a material with good heat conductivity such as die casting, iron casting, copper casting, and alloy casting of these. The vaporizer 23 includes a vaporizing surface 25 and a heat receiving unit 26 provided on the back surface. Numeral 27 denotes an opening 2 for supplying the liquid fuel and the combustion air ejected from the nozzle 22 into the vaporizer 23 so as to face the substantially central portion of the vaporizing surface 25.
8, a blower for supplying combustion air, 29 is an outlet provided at the lower end of the vaporizer 23, and communicates with the outlet 30 to form a mixing chamber 31 on the downstream side of the vaporizer 23. Provided. The mixing chamber 31 is made of a material having good heat conductivity such as aluminum, copper, an alloy thereof, an iron casting, a copper casting, or an alloy casting thereof. Reference numeral 32 denotes a burner head for burning the air-fuel mixture formed in the mixing chamber 31, provided downstream of the mixing chamber 31 and connected to the vaporizer 23. The burner head 32 includes a rich flame port 33 arranged parallel to the vaporizing surface 25 for burning a rich mixture, a light flame port 34 for burning a light mixture, and a secondary air port 35. A heat receiving rich flame port 33a is provided at a lower portion, and a plurality of rows are provided in the order of the secondary air port 35, the rich flame port 33, the light flame port 34, and the rich flame port 33. Rich flame port 33, light flame port 34, and heat-receiving flame port 33a
Is made of a heat-resistant punched plate, laminated plate or the like and is made porous. The secondary air port 35 is made of a heat-resistant steel material and has a jet port 36 at an upper portion. A burner head case 37 surrounds the burner head 32 and forms a combustion chamber 38 with the carburetor 23. Reference numeral 39 denotes a temperature detector formed of a thermocouple, a thermistor, or the like for detecting the temperature of the vaporizer 23, and reference numeral 40 denotes a control unit that receives a signal from the temperature detector 39 and controls the operation of the heater 24.

Next, the operation and operation will be described. In the above configuration, when a power supply (not shown) is turned on, the control unit 40
, The heater 24 is energized to heat the vaporizer 23. When the temperature detector 39 detects that the vaporizer 23 has reached a predetermined temperature, the signal is transmitted to the control unit 40 to stop energizing the heater 24 and complete the preheating. Since then
The controller 40 keeps the temperature of the vaporizer 23 constant while turning on and off the power supply to the heater 24, and enters a standby state. In the case of a hot water heater in a standby state, when the faucet of the hot water supply circuit is opened, the combustion air from the blower 29 flows into the opening 28 of the vaporizer lid 27.
Flows into the vaporizer 23 as vaporizing air from
Liquid fuel is supplied from a nozzle 22 through a pump 21 to the carburetor 2.
Squirt into 3 The ejected liquid fuel collides with the vaporizing surface 25 together with the combustion air flowing into the vaporizer 23, is pushed out to the surroundings, is vaporized by heating, and is mixed with the vaporizing air to form a combustible air-fuel mixture in the vaporizer 23. The combustible air-fuel mixture flows into the mixing chamber 31 from the outlet 30 and is uniformly mixed in the mixing chamber 31. A part of the combustible air-fuel mixture is supplied to the rich flame outlet 33 as a rich air-fuel mixture. The diluted light mixture is sent to the light flame outlet 34. Part of the combustion air supplied from the blower 29 is sent to the secondary air port 35 as secondary air. The air-fuel mixture ejected from the rich flame port 33 and the light flame port 34 is generally ignited by ignition means (not shown).
To form a rich flame, and then to ignite sequentially to form a rich flame in the rich flame port 33 and a light flame in the light flame port to burn. The rich flame holds the light flame so as to surround the light flame, and the secondary air injected from the outlet 36 of the secondary air port 35 holds the rich flame so as to surround the rich flame and is formed by the burner head case 37. The stable combustion is maintained in the combustion chamber 38 thus set. Further, the heat of the combustion of the rich flame formed by the heat-receiving rich flame port 33a provided at the lower portion of the heat-receiving part 26 is received by the heat-receiving part 26 to raise the temperature of the vaporizer 23 and suppress the energization of the heater 24. To keep burning.

Here, the heat-receiving rich flame port 33a is disposed below the heat-receiving section 26 in parallel with the vaporizing surface 25, so that the heat-receiving section 26 is formed by the heat-receiving rich flame port 33a during combustion. Since the combustion heat from the rich flame can be received from the entire surface of the rich flame outlet 33a below the heat receiving portion, the amount of heat received is increased, and the carburetor 23 can be used without increasing the capacity of the heater 24 or extending the energizing time of the heater 24. Can be set to the optimal vaporization temperature, so that power consumption can be reduced. When the heat receiving section 26 is composed of a plurality of fins and is installed perpendicular to the heat receiving rich flame outlet 33a, the amount of heat received by the vaporizer 23 increases, and the power consumption can be further reduced.

Further, the light flame outlet 3
The lean flame formed in step 4 tends to be lifted, and the rich flame formed in the rich flame port 33 is used to maintain the lean flame by the rich mixture of excess fuel, and the fuel supply amount and combustion air amount are increased. Is changed to deteriorate the stability of the rich flame and prevent the rich flame from maintaining the light flame. The rich flame is maintained by maintaining the rich flame by the secondary air ejected from the outlet 36 of the secondary air port 35. The secondary air keeps the rich flame even if the fuel supply amount or the combustion air amount changes, the rich flame keeps the light flame, and the rich flame and the light flame are stable even if the fuel supply amount or the combustion air amount changes. , A good combustion exhaust gas can be obtained. Note that the same effect can be obtained even if the ejection port 36 of the secondary air port 35 is formed of a small hole, a slit or a punching plate.

(Embodiment 2) FIG. 2 shows a combustion apparatus according to Embodiment 2 of the present invention. FIG. 2 is an enlarged view of a main part of the combustion apparatus.

The second embodiment differs from the first embodiment in that the burner head 32 below the heat receiving portion 26 of the vaporizer 23 is provided with a plurality of heat-receiving rich flame ports 33a continuously, and a secondary air port 35 is provided. , A deep flame outlet 33, a light flame outlet 34, and a deep flame outlet 33 in this order.

The parts having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

Next, the operation and operation will be described.
Since the amount of heat received by the heat receiving section 26 is proportional to the heat receiving area of the heat receiving section 26 facing the burner head 32 and the flame temperature, the length of the heat receiving section 26 facing the burner head 32 is increased in order to increase the amount of heat received. By increasing the length of the heat receiving rich flame outlets 33a having a high flame temperature opposed thereto, the amount of heat received can be increased to reduce the power consumption of the heater 24, and one heat receiving rich flame opening 33a can be provided. In this case, the heat receiving rich flame port 33a may be deformed as the flame port temperature rises. However, since the heat receiving rich flame port 33a is composed of a plurality of heat receiving rich flame ports 33a, the heat receiving rich flame accompanying the rise of the flame port temperature increases. The deformation of the opening 33a can be prevented, and the reliability can be improved.

(Embodiment 3) FIG. 4 shows a combustion apparatus according to Embodiment 3 of the present invention. FIG. 4 is an enlarged view of a main part of the combustion device. The third embodiment is different from the first or second embodiment in that the burner head 32 below the heat receiving unit 26 of the vaporizer 23 is used.
And a secondary air port 35 is provided in the burner head 32 below the end of the heat receiving section 26.

The portions having the same reference numerals as in the first embodiment have the same structure, and the description will be omitted.

Next, the operation and operation will be described. The temperature of the vaporizer 23 due to the heat received from the rich flame during combustion has a temperature gradient between the heat receiving portion 26 and the vaporizing surface 25, and the burner head at the tip of the heat receiving portion 26. Since the portion facing 32 has the highest temperature, the lower portion of the heat receiving portion 26 is defined as a heat receiving rich flame port 33a, and the lower end of the heat receiving portion 26 is defined as a secondary air port 35. Cooling by the air from the next air port 35 prevents the tip of the heat receiving portion 26 from becoming high temperature, thereby improving the reliability of the carburetor 23, and the heat receiving rich flame port below the heat receiving portion 26. The amount of heat received can be secured by the rich flame 33a.

(Embodiment 4) FIG. 5 shows a combustion apparatus according to Embodiment 4 of the present invention. FIG. 5 is an enlarged view of a main part of the combustion device. The fourth embodiment is different from the first embodiment in that the opening ratio of the rich flame port 33 and the light flame port 34 is changed by the burner head case 37.
Is that the vicinity of the side wall 41 is made rougher than the vicinity of the center.

The portions denoted by the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. The opening ratio of the rich flame port 33 and the light flame port 33 near the side wall 41 of the burner head case 36 is made rougher than that near the center, so that it is closer to the side wall 41. The rich flame and the light flame formed by the rich flame port 33 and the light flame port 34 become coarser than the shade and the light fire near the center, and the burner head case 37 becomes hot due to the rich flame and the light flame. Thus, the reliability of the burner head case 37 can be improved. It should be noted that the same effect can be obtained even if the opening ratio in the vicinity of the side wall portion 41 of the burner head case 37 of only the rich flame outlet 33 is made coarse. Further, the same effect can be obtained even if the aperture ratio near the side wall portion 41 of the burner head case 37 of the heat receiving rich flame port 33a below the heat receiving portion 26 is made rough.

(Embodiment 5) FIG. 6 shows a combustion apparatus according to Embodiment 5 of the present invention. FIG. 6 is an enlarged view of a main part of the combustion device. The fifth embodiment is different from the first embodiment in that the secondary air port 3 near the side wall 41 of the burner head case 37 is different from the first embodiment.
The fifth embodiment is characterized in that the injection port 36 of No. 5 is made denser than the vicinity of the center.

The portions denoted by the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. Since the outlet 36 of the secondary air port 35 near the side wall 41 of the burner head case 37 is made denser than the vicinity of the center, the outlet 3
Burner head case 3
7 can prevent the burner head case 37 from becoming high temperature by cooling the rich flame and the light flame formed near the side wall 41 and forming an air layer between the burner head case 37 and the burner head case 37. 37 can be improved in reliability.

(Embodiment 6) FIG. 7 shows a combustion apparatus according to Embodiment 6 of the present invention. FIG. 7 is an enlarged view of a main part of the combustion device. The sixth embodiment differs from the first embodiment in that the heat-receiving rich flame port 33a of the burner head 32 below the heat-receiving section 26.
Is that the aperture ratio is made denser than that of the rich flame outlet 33 other than below the heat receiving part 26.

The portions denoted by the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described.
The opening ratio of the heat-receiving rich flame port 33a below the heat-receiving portion 26 is made denser than that of the heat-receiving rich flame port 33 below the heat-receiving portion 26, so that the rich flame formed by the heat-receiving rich flame port 33a below the heat receiving portion 26 is dense. , The amount of heat received by the heat receiving unit 26 increases, and the vaporizer 23 can be set to the optimal vaporization temperature without increasing the capacity of the heater 24 or extending the energization time of the heater 24, thereby reducing power consumption. .

(Embodiment 7) FIG. 8 shows a combustion apparatus according to Embodiment 7 of the present invention. FIG. 8 is an enlarged view of a main part of the combustion device. The seventh embodiment is different from the first embodiment in that a part of the light flame port 33 is a non-porous portion 42.

The parts having the same reference numerals as in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. Generally, the burner head 32 is ignited by a fuel-rich rich flame port 33 which is easy to ignite, and the rich flame formed by the rich flame port 33 is sequentially flared. A rich flame and a light flame are formed. Since the light flame formed at the light flame port 34 is composed of a lean air-fuel mixture, the light flame ignites to the adjacent rich flame port 33. In this case, the transfer of the fire to the rich flame port 33 distant from the rich flame port 33 ignited by making a part of the light flame port 34 into the non-porous portion 42 is completed in a short time. Since no odor is generated due to this, good combustion characteristics can be obtained.

(Eighth Embodiment) FIG. 9 shows a combustion apparatus according to an eighth embodiment of the present invention. FIG. 9 is an enlarged view of a main part of the combustion device. The eighth embodiment is different from the first embodiment in that a part of the secondary air port 35 is formed as a non-porous portion 43.

The portions denoted by the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described.
Then, the rich flame formed at the rich flame port 33 is sequentially flared to form a rich flame and a light flame over the entire burner head 32. The flaring from the rich flame port 33 is a secondary air port. 3
Since part of 5 is a non-porous portion 43, the transfer to the rich flame port 33 far from the rich flame port 33 ignited without being divided by the secondary air port 35 is completed in a short time. Since no odor is generated due to ignition delay, good combustion characteristics can be obtained.

[0053]

As described above, according to the combustion apparatus of the first aspect of the present invention, the heat-receiving rich flame port is disposed below the heat-receiving portion in parallel with the vaporizing surface, so that the heat-receiving portion is provided. Can receive the combustion heat from the rich flame formed by the rich flame opening during combustion from the entire surface of the rich flame opening below the heat receiving section, so the amount of heat received increases, and the capacity of the heater can be increased, Since the vaporizer can be set to the optimal vaporization temperature without extending the energization time, the power consumption can be reduced.

Further, a lean flame formed by an excess air-lean mixture tends to have a lift tendency.
In addition, the fact that the stability of the rich flame is deteriorated due to the change in the fuel supply amount and the combustion air amount and the rich flame cannot maintain the light flame can be prevented by the secondary flame ejected from the outlet of the secondary air port. And the flame is maintained to ensure the stability of the rich flame, so that there is an effect that a stable flame can be formed in both the rich flame and the light flame to obtain good combustion exhaust gas.

According to the combustion apparatus of the second aspect,
The amount of heat received by the heat receiving section is proportional to the heat receiving area of the heat receiving section facing the burner head and the flame temperature. By using a plurality of rich flame outlets with a high flame temperature, the amount of heat received can be increased to reduce the power consumption of the heater. Although there is a possibility that the hot flame outlet may be deformed, it is made up of multiple heat receiving rich flame ports, so it is possible to prevent deformation of the heat receiving rich flame port due to the rise of the flame port temperature and improve reliability. There is an effect that good combustion exhaust gas can be obtained.

According to the combustion apparatus of the third aspect,
The temperature of the vaporizer due to the heat received from the flame during combustion has a temperature gradient between the heat receiving part and the vaporizing surface, and the part facing the burner head at the tip of the heat receiving part has the highest temperature. As a rich flame port and a secondary air port below the tip of the heat receiving section, the tip of the heat receiving section is cooled by the air from the secondary air port to prevent the tip of the heat receiving section from becoming high in temperature. The reliability can be improved, and the amount of heat received can be secured by the rich flame of the rich flame opening for heat reception below the heat receiving section.

According to the combustion apparatus of the fourth aspect,
Since the opening ratio of the rich flame port and the light flame port near the side wall of the burner head case is made coarser than that near the center, the rich flame and the light flame formed by the rich flame port and the light flame port become coarse, There is an effect that the burner head case can be prevented from becoming high temperature by the flame and the light flame, and the reliability of the burner head case can be improved.

According to the combustion apparatus of the fifth aspect,
Since the outlet of the secondary air port near the side wall of the burner head case is made denser than that near the center, the rich flame formed near the side wall of the burner head case by the secondary air ejected from the outlet is By cooling the light flame and forming an air layer between the burner head case and the burner head case, there is an effect that the burner head case can be prevented from becoming high temperature and the reliability of the burner head case can be improved.

Further, according to the combustion apparatus of claim 6,
Since the opening ratio of the heat-receiving rich flame port below the heat receiving part is made denser than the rich flame ports other than below the heat receiving part, the rich flame formed at the rich flame port below the heat receiving part becomes dense and the amount of heat received by the heat receiving part And the power consumption can be reduced because the vaporizer can be set to the optimal vaporization temperature without increasing the capacity of the heater or increasing the energization time of the heater.

Further, according to the combustion device of the seventh aspect,
In general, it is ignited with a fuel-rich flame that is easy to ignite
The rich flame formed at the rich flame outlet is successively flared to form a rich flame and a light flame over the entire burner head. Therefore, it is bad for the light flame to transfer to the adjacent rich flame outlet, but since the part of the light flame port is made non-porous, the fire to the rich flame outlet far from the ignited rich flame outlet is bad. The transfer is completed in a short time,
Since there is no generation of odor due to ignition delay, there is an effect that good combustion characteristics can be obtained.

Further, according to the combustion apparatus of claim 8,
The flame is ignited at the rich flame port, and the rich flame formed at the rich flame port is successively ignited to form a rich flame and a light flame over the entire burner head. Since the transfer from the rich flame outlet is not divided by the secondary air port, the transfer to the rich flame port far from the ignited rich flame port is completed in a short time, causing ignition delay and causing odor Therefore, there is an effect that good combustion characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a combustion device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the combustion device.

FIG. 3 is a sectional view of a combustion device according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a combustion device according to a third embodiment of the present invention.

FIG. 5 is an enlarged view of a main part of a combustion device according to a fourth embodiment of the present invention.

FIG. 6 is an enlarged view of a main part of a combustion apparatus according to a fifth embodiment of the present invention.

FIG. 7 is an enlarged view of a main part of a combustion device according to a sixth embodiment of the present invention.

FIG. 8 is an enlarged view of a main part of a combustion device according to a seventh embodiment of the present invention.

FIG. 9 is an enlarged view of a main part of a combustion device according to an eighth embodiment of the present invention.

FIG. 10 is a perspective view of a conventional combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Pump 22 Nozzle 23 Vaporizer 24 Heater 25 Vaporization surface 26 Heat receiving part 27 Vaporizer lid 28 Opening 29 Blower 30 Outflow port 31 Mixing chamber 32 Burner head 33 Rich flame port 33a Rich flame port for heat reception 34 Light flame port 35 Secondary Air port 36 Spout port 37 Burner head case 38 Combustion chamber 39 Temperature detector 40 Control section 41 Side wall section 42, 43 Non-porous section

Continued on the front page (72) Inventor Nobuhiko Fujiwara 1006 Kadoma Kadoma, Osaka Prefecture F-term (reference) in Matsushita Electric Industrial Co., Ltd. 3K065 TA01 TA13 TA15 TC02 TD04 TH04

Claims (8)

[Claims] 1. A fuel supply means for supplying liquid fuel, a nozzle for ejecting the supplied liquid fuel, and a vaporizer having a vaporizing surface for vaporizing the liquid fuel ejected from the nozzle.
A temperature detector for detecting the temperature of the vaporizer, a mixing chamber connected downstream of the vaporizer, and a burner head provided downstream of the mixing chamber and connected to the vaporizer, A burner head case surrounding the burner head to form a combustion chamber, a blower for supplying combustion air, and an opening for guiding liquid fuel ejected from the nozzles and combustion air supplied from the blower; And a burner head, wherein the burner head includes a rich flame port disposed in parallel with the vaporizing surface for burning a rich mixture, a lean flame port burning a light mixture, and a secondary air port. A heat receiving rich flame port is disposed below the heat receiving section, and then the secondary air port and each of the light and shade flame ports are arranged in the order of a secondary air port, a rich flame port, a light flame port, and a rich flame port. Combustion devices arranged in rows. 2. The combustion device according to claim 1, wherein a plurality of heat-receiving flame outlets below the heat-receiving portion of the vaporizer are continuously arranged. 3. A heat receiving rich flame port is provided below the heat receiving section of the vaporizer, and a secondary air port is provided below a tip of the heat receiving section.
The combustion device according to any one of claims 1 to 2. 4. The combustion apparatus according to claim 1, wherein the opening ratio of the rich flame port and the light flame port near the side wall of the burner head case is made coarser than that near the center. 5. The combustion device according to claim 1, wherein the outlet of the secondary air port near the side wall of the burner head case is made denser than near the center. 6. The combustion apparatus according to claim 1, wherein an opening ratio of the heat-receiving rich flame port of the burner head below the heat-receiving section is made higher than that of the rich flame port other than below the heat-receiving section. 7. The combustion apparatus according to claim 1, wherein a part of the light flame port is made non-porous. 8. A method according to claim 1, wherein a part of the secondary air port is made non-porous.
The combustion device according to any one of claims 1 to 7.