JPH0894022A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE: To reduce the ejector noise by reducing the temperature difference in mixing between the vaporized gas and the primary air without complicating the structure of a device. CONSTITUTION: A liquid fuel combustion device is provided with a vaporizer 5 to vaporize the liquid fuel into the vaporized gas, a nozzle 6 to eject the vaporized gas into the vaporizer 5 and a burner 7 to mix the vaporized gas with the primary air in the ejecting direction of the nozzle 6, feeds the liquid fuel to the vaporizer 5 to make the vaporized gas, and ejects the vaporized gas into the burner 7 from the nozzle 6, distributes the primary air in the burner 7 by the ejector effect, and mixes the primary air with the vaporized gas in the burner 7 to achieve the combustion. A primary air distributing passage 13 to distribute the primary air is formed, and a burner cover 16 to conduct the combustion heat during the combustion to the primary air is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporizer that uses liquid fuel as vaporized gas, a nozzle that ejects the vaporized gas to the vaporizer, and a burner that mixes the vaporized gas with primary air in the direction of ejection of the nozzle. Equipped with a liquid fuel to the vaporizer as vaporized gas, eject the vaporized gas from the nozzle into the burner, to circulate the primary air into the burner by the ejector effect, the primary air and the vaporized gas The present invention relates to a liquid fuel combustion apparatus that mixes and burns in a burner.

[0002]

2. Description of the Related Art As a conventional liquid fuel combustion apparatus of this kind, there is, for example, a Bunsen combustion type oil fan heater, which is constructed as shown in FIG. A storage tank 2 for storing liquid fuel such as kerosene is provided on the lower right side with respect to the front inside the box-shaped oil fan heater body 1, and a cartridge tank 3 for supplying the liquid fuel to the storage tank 2 is provided in the storage tank 2. A supply means 4 which is detachably mounted on the upper surface and is composed of a pump or the like for supplying the liquid fuel of the storage tank 2 to a vaporizer 5 described later is connected to the storage tank 2 and the vaporizer 5, and the supply means is provided. The vaporizer 5 that heats the liquid fuel supplied in 4 into vaporized gas is arranged in the lower right part of the front of the oil fan heater body 1, and a nozzle for ejecting vaporized gas from the vaporizer 5 is provided. 6 It is formed in equalizer 5.

A burner 7 for combustion is provided on the side from which the vaporized gas is ejected by the nozzle 6, the burner 7 is fitted into the opening on the bottom surface, and the combustion chamber 8 is provided above the burner 7.
And a heat recovery section 11 for recovering the heat of the combustion flame 10 which burns up on the upper surface of the burner 7.
Is disposed in the carburetor 5 so as to pass through the bottom surface of the combustion chamber 8 and is located in the combustion chamber 8, and the combustion chamber 8 heated by the combustion flame 10 emitted from the upper opening of the combustion cylinder 9 to the back side of the combustion cylinder 9
A blower 12 for sucking indoor air into the main body 1 and blowing the air to a warm air outlet (not shown) provided in the lower front portion of the main body 1 is provided.

Further, the burner cover 1 is provided with a primary air flow passage 13 which is a flow passage for allowing the primary air to flow to the opening of the burner 7.
4, a burner cover 14 is formed to be airtight so as to cover the lower portion of the burner 7 excluding the surface of the carburetor 5 on the nozzle 6 side.
An opening 15 for sucking the primary air, which is room air, into the primary air flow passage 13 is formed on the bottom surface of the.

In the petroleum fan heater constructed as described above, liquid fuel is supplied to the cartridge tank 2, the cartridge tank 2 is set in the storage tank 3, and at the same time as the setting, the cartridge tank 2 to the storage tank 3 are set. Liquid fuel is supplied to and stored.

When the oil fan heater is operated, the vaporizer 5 is energized and heated, and the liquid fuel in the storage tank 2 is supplied to the vaporizer 5 which is being heated by the supply means 4 to supply the high temperature vaporized gas. Then, the vaporized gas is ejected from the nozzle 6 into the burner 7 through the opening of the burner 7.

Further, the primary air is sucked into the primary air flow passage 13 from the opening 15 of the burner cover 14 by the ejector (chimney) effect, and the sucked primary air is passed through the opening of the burner 7 in the primary air flow passage 13. The combustion flame 10 is ignited on the upper surface of the burner 7 by flowing the gas into the burner 7, mixing the vaporized gas and the primary air in the burner 7 into a mixed gas, and igniting it by an ignition means (not shown). .

When the combustion flame 10 burns on the upper surface of the burner 7, the combustion flame 10 heats the air in the combustion chamber 8 and also heats the heat recovery section 11 to recover the heat to the carburetor 5 and recover it. By using the generated heat as heat for vaporizing the liquid fuel, the power consumption required for heating the vaporizer 5 can be reduced.

Further, the burner 7 is heated by the heat of the combustion flame 10, and the lower part of the burner 7 in contact with the primary air flow passage 13 transfers the heat to the primary air flowing through the primary air flow passage 13 to generate a high temperature vaporized gas. The temperature difference between the primary air and the primary air is reduced to reduce ejector (jet) noise generated by jetting from the nozzle 6 into the burner 7.

The air (hot air) in the combustion chamber 8 heated by the combustion flame 10 is discharged from the upper opening of the combustion cylinder 9, and the discharged air (hot air) is sucked into the main body by the blower 12. The air is blown as warm air to the hot air outlet to heat the room.

However, in the petroleum fan heater constructed as described above, when the vaporized gas and the primary air are mixed, the temperature of the vaporized gas vaporized by heating the liquid fuel and the primary portion by the lower portion of the burner 7 The temperature difference between the temperature of heat transfer to the primary air flowing through the air flow passage 13 is too large and the ejector noise during mixing is high.

To solve the above-mentioned drawbacks, Japanese Patent Laid-Open No. 5-27
In the liquid fuel combustion apparatus of Japanese Patent No. 2713, two types of configurations are disclosed, and first, the above-mentioned drawbacks are solved.
In the second configuration, a heat exchanger that receives heat from the vaporizer and heats the primary air is provided around the nozzle.

Further, the second structure for solving the above-mentioned drawback is a means for sending a part of the warm air discharged from the upper part of the combustion cylinder to the periphery of the nozzle while reheating it on the side wall of the combustion cylinder. Is provided.

By adopting the above-mentioned two types of configurations, the temperature difference at the time of mixing the vaporized gas ejected from the nozzle and the heated primary air is reduced, and the ejector noise is reduced by about 4 dB (decibel). .

[0015]

However, in the liquid fuel combustion apparatus disclosed in Japanese Unexamined Patent Publication No. 5-272713, firstly, in the first structure for solving the above-mentioned drawbacks, a vaporizer for vaporizing liquid fuel is used. Since the heat is transferred to the heat exchanger to heat the primary air, the temperature of the vaporizer is lowered, which affects the gasification of the liquid fuel. Therefore, there is a problem in that the power consumption required for the carburetor increases when the amount of energization is increased to compensate for the temperature decrease of the carburetor.

In addition, in the structure of the second structure which solves the above-mentioned drawbacks, it is necessary to separately provide means for feeding to the periphery of the nozzle while reheating on the side wall of the combustion cylinder, so that the structure inside the main body is complicated. There was a problem that became.

The liquid fuel combustion apparatus of the present invention solves the above-mentioned problems, the structure inside the main body is not complicated, and the temperature of the vaporizer is lowered to affect the gasification of the liquid fuel. It is possible to prevent an increase in power consumption caused by compensating for the temperature drop of the carburetor without
Moreover, it is an object of the present invention to provide a liquid fuel combustion apparatus capable of reducing the ejector noise by reducing the temperature difference when the vaporized gas and the primary air are mixed.

[0018]

In order to achieve the above object, a liquid fuel combustion apparatus according to the present invention is a vaporizer which uses liquid fuel as vaporized gas, and the vaporized gas in the vaporizer. And a burner for mixing the vaporized gas with the primary air in the jetting direction of the nozzle, supplying liquid fuel to the vaporizer to produce vaporized gas, and ejecting the vaporized gas from the nozzle into the burner. Then, the primary air is circulated into the burner by the ejector effect, and in the liquid fuel combustion apparatus that mixes the primary air and the vaporized gas in the burner to perform combustion, a flow passage is formed to circulate the primary air. The heat transfer means for transferring the heat of combustion at the time of combustion to the primary air is provided.

The invention according to claim 2 is the invention according to claim 1, wherein a space is formed between the heat transfer means and the vaporizer.

Furthermore, the invention according to claim 3 is the same as claim 1.
In the invention described above, the flow passage except the opening for sucking the primary air into the flow passage is formed airtight by the heat transfer means.

Moreover, the invention according to claim 4 is the same as claim 1.
In the invention described above, heat dissipation means is provided on the wall surface of the heat transfer means in the flow passage.

Furthermore, the invention of claim 5 is the same as claim 1.
In the invention described above, sound absorbing means is provided on the wall surface of the heat transfer means in the flow passage.

[0023]

According to the present invention, the heat transfer means forms the flow passage for circulating the primary air, and the heat of combustion at the time of combustion is generated by the heat transfer means in the flow passage. By transferring heat to the circulating primary air, the heat transfer means also serves as a member that forms a flow passage, so the structure inside the main body does not become complicated, and the temperature at the time of mixing the vaporized gas and the primary air Ejector noise can be reduced by reducing the difference.

Further, in the invention according to claim 2, in the structure according to claim 1, by forming a space between the heat transfer means and the carburetor, the temperature of the carburetor is lowered and the gas of the liquid fuel is reduced. It is possible to prevent an increase in power consumption caused by supplementing the temperature decrease of the carburetor without affecting the vaporization.

Further, the invention according to claim 3 is the same as claim 1.
In the configuration described above, by forming the flow passage in an airtight manner by the heat transfer means except the opening for sucking the primary air into the flow passage, the heat transfer means does not leak the ejector noise to the outside and insulates the sound inside the flow passage. As a result, leakage of ejector noise to the outside can be reduced.

Moreover, the invention of claim 4 is the same as claim 1
In the configuration described above, the heat radiating means radiates the heat from the heat transfer means into the flow passage and transfers the heat to the primary air, whereby the temperature of the primary air becomes higher and the vaporized gas and the primary air are separated. Ejector noise can be reduced by reducing the temperature difference during mixing.

In addition, the invention of claim 5 is the same as claim 1.
In the configuration described above, by absorbing and attenuating the ejector noise by the sound absorbing means, it is possible to further reduce the leakage of the ejector noise to the outside.

[0028]

Embodiments of the liquid fuel combustion apparatus of the present invention will be described below in detail with reference to FIGS. 1 to 3 using a petroleum fan heater, for example. The same parts as those in the conventional example are designated by the same reference numerals, and the description of the structure and operation of the same parts will be omitted.

The first embodiment of the liquid fuel combustion apparatus of the present invention is constructed as shown in FIG. 1. In FIG. 1, the heat transfer is good in place of the conventional burner cover 14 shown in FIG. The burner cover 16 which is a heat transfer means is formed of metal or the like, and the entire circumference or part of the upper end 16a of the burner cover 16 is penetrated through the bottom surface of the combustion cylinder 9 to form a surface of the upper end 16a of the burner cover 16. Is arranged toward the combustion flame 10 side so that the radiant heat of the combustion flame 10 is easily received, and the primary air flow passage 13 is meandered in the burner cover 16 to form a partition plate 16b for setting the primary air flow passage 13 to be long. are doing.

The primary air flow passage 13 except the opening 15 for sucking the primary air into the primary air flow passage 13 is formed airtight by the burner cover 16 so that the carburetor 5 does not come into contact with the burner cover 16. A space 17 is formed between the burner cover 16 and the vaporizer 5, and the burner cover 1
The nozzle 6 is penetrated through the wall surface of 6 and is disposed in the primary air flow path 13.

With the configuration as in the first embodiment, the radiant heat from the combustion flame 10 during combustion is received by the surface of the upper end 16a of the burner cover 16, and the heat received by the upper end 16a is received. The primary air sucked from the opening 15 due to heat transfer over the entire burner cover 16 is the primary air flow passage 1
Since the burner cover 16 serves both as the conventional burner cover 14 forming the primary air flow passage 13 and the heat transfer means for transferring heat to the primary air by heating while flowing through the inside of the main body 1, The structure does not become complicated, and the ejector noise can be reduced by reducing the temperature difference when the vaporized gas and the primary air are mixed.

Since a space is formed between the burner cover 16 and the vaporizer 5, heat is not taken from the vaporizer 5, so that the temperature of the vaporizer 5 decreases and gasification of liquid fuel occurs. It is possible to prevent an increase in power consumption caused by compensating for the temperature decrease of the carburetor 5 without affecting the temperature.

Further, by forming the primary air flow passage 13 except the opening 15 for sucking the primary air into the primary air flow passage 13 airtight by the burner cover 16, the burner cover 16 leaks ejector noise to the outside. Since the sound is shielded in the primary air flow passage 13 without being caused, the leakage of the ejector noise to the outside can be reduced.

The second embodiment of the liquid fuel combustion apparatus of the present invention is constructed as shown in FIG. In addition, the first
The same parts as those of the embodiment are given the same reference numerals and the description thereof will be omitted. In FIG. 2, a heat radiating fin 18 as a heat radiating means is provided on the wall surface of the burner cover 16 in the primary air flow passage 13.
Is attached.

With the configuration as in the second embodiment, the heat radiation fins 18 radiate the heat from the burner cover 16 into the primary air flow passage 13 to improve the heat transfer to the primary air. As a result, the temperature of the primary air becomes even higher, and the difference in temperature when the vaporized gas and the primary air are mixed can be reduced to reduce the ejector noise.

Noise measurement according to JIS standard (An oil fan heater is installed on the floor of an anechoic chamber, a microphone is installed 1 m in front of the oil fan heater and at a height of 1 m from the floor. In the range, measured with a sound level meter)
The conventional oil fan heater shown in FIG. 4 has a noise level of 39 dB (decibel), while the oil fan heater of the second embodiment can reduce noise to 37 dB.

The third embodiment of the liquid fuel combustion apparatus of the present invention is constructed as shown in FIG. In addition, the first
The same parts as those of the embodiment are given the same reference numerals and the description thereof will be omitted. In FIG. 3, in order to reduce the heat transfer to the primary air and to make the ejector noise generated when the vaporized gas is injected from the nozzle 6 more effective, the nozzle 6 is opposed to the nozzle 6 in the primary air passage 13. Burner cover 16
A sound absorbing material 19 which is a porous or fibrous sound absorbing means is attached to the wall surface (sound source side) of the above.

Since the sound absorbing member 19 is attached to the side closer to the sound source side by the construction as in the third embodiment, the ejector noise is not reflected by the burner cover 16 and transmitted, which is more effective. Moreover, by absorbing and attenuating the ejector noise with the sound absorbing material 19, it is possible to further reduce the leakage of the ejector noise to the outside.

Further, since the sound absorbing material 19 is attached only to the near side of the sound source side, the obstruction of heat transfer to the primary air by the burner cover 16 is suppressed as much as possible.

In the JIS standard measurement, the third
With the configuration of the above embodiment, the ejector noise can be reduced to 35 dB.

[0041]

Since the liquid fuel combustion apparatus of the present invention has the above-described structure, the invention according to claim 1 forms a flow passage through which the primary air is circulated by the heat transfer means to perform combustion at the time of combustion. By transferring the heat to the primary air flowing in the flow passage by the heat transfer means, the heat transfer means also serves as a member forming the flow passage, so that the structure inside the main body does not become complicated, Ejector noise can be reduced by reducing the temperature difference when the vaporized gas and the primary air are mixed.

In addition to the effect of claim 1, the invention according to claim 2 arranges the heat transfer means and the carburetor without contacting each other, so that the temperature of the carburetor is lowered and the liquid fuel is reduced. It is possible to prevent an increase in power consumption caused by compensating for the temperature decrease of the vaporizer without affecting the gasification of the gas.

Furthermore, the invention according to claim 3 is the same as claim 1.
In addition to the effects described above, by forming the flow passage excluding the opening for sucking the primary air into the flow passage in an airtight manner by the heat transfer means, the heat transfer means does not leak ejector noise to the outside of the flow passage. Since the sound is shielded by, it is possible to reduce the leakage of the ejector noise to the outside.

Moreover, the invention of claim 4 is the same as claim 1.
In addition to the effects described above, the heat radiating means radiates the heat from the heat transfer means into the flow passage to transfer the heat to the primary air, whereby the temperature of the primary air becomes higher and the vaporized gas and the primary air become higher. Ejector noise can be reduced by reducing the temperature difference during mixing with.

Furthermore, the invention according to claim 5 is the same as claim 1.
In addition to the effects described, by absorbing and attenuating the ejector noise by the sound absorbing means, it is possible to further reduce the leakage of the ejector noise to the outside.

[Brief description of drawings]

FIG. 1 is a schematic front vertical sectional view of an oil fan heater showing a first embodiment of a liquid fuel combustion apparatus of the present invention.

FIG. 2 is a schematic vertical sectional side view centering on a burner showing a second embodiment of the liquid fuel combustion apparatus of the present invention.

FIG. 3 is a schematic front vertical sectional view of an oil fan heater showing a third embodiment of the liquid fuel combustion apparatus of the present invention.

FIG. 4 is a schematic front vertical sectional view of a conventional oil fan heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil fan heater main body 5 Vaporizer 6 Nozzle 7 Burner 13 Primary air flow passage (flow passage) 15 Opening 16 Burner cover (heat transfer means) 17 Space portion 18 Radiating fin (radiating means) 19 Sound absorbing material (sound absorbing means)

Claims (5)

[Claims] 1. A carburetor comprising: a vaporizer that uses liquid fuel as vaporized gas; a nozzle that ejects the vaporized gas to the vaporizer; and a burner that mixes the vaporized gas and primary air in the ejection direction of the nozzle. Liquid fuel is supplied to the gas as a vaporized gas, the vaporized gas is ejected from the nozzle into the burner, and the primary air is circulated into the burner by the ejector effect.
In the liquid fuel combustion device that performs combustion by mixing the primary air and the vaporized gas in a burner, while forming a flow passage through which the primary air flows,
A liquid fuel combustion apparatus, comprising heat transfer means for transferring the heat of combustion during combustion to the primary air. 2. The liquid fuel combustion apparatus according to claim 1, wherein a space is formed between the heat transfer means and the vaporizer. 3. The liquid fuel combustion apparatus according to claim 1, wherein the flow passage except the opening for sucking the primary air into the flow passage is formed airtight by the heat transfer means. 4. The liquid fuel combustion apparatus according to claim 1, wherein a heat dissipation means is provided on a wall surface of the heat transfer means in the flow passage. 5. The liquid fuel combustion apparatus according to claim 1, wherein a sound absorbing means is provided on a wall surface of the heat transfer means in the flow passage.