JPH05272713A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To provide a liquid fuel combustion device having a simple configuration and capable of reducing ejector noise in an inexpensive manner. CONSTITUTION:A heat exchanger 29 receiving a thermal transmittance from a gasifier device 1 and heating primary air is arranged around an injection nozzle 6. There is provided means for feeding a part of hot air discharged from an upper part of a combustion cylinder 21 while reheating it. With such an arrangement, gasification gas injected from the injection nozzle 6 and the heat primary air can be mixed to each other, the temperature difference at the time of mixing can be reduced and the noise value of the ejector can be reduced by about 4dB.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus having a jet nozzle.

[0002]

2. Description of the Related Art FIG. 8 is a front sectional view showing the structure of a petroleum fan heater equipped with a conventional liquid fuel combustion apparatus.
Is a side sectional view thereof, and FIG. 10 is a partially enlarged sectional view around the combustor. In each figure, 1 is a vaporizer for vaporizing liquid fuel, 2 is an annular vaporization chamber formed in the vaporizer 1,
Reference numeral 3 is a throat pipe integrally formed with the vaporizer 1, 4 is a preheating heater embedded in the vaporizer 1, 5 is an oil supply pipe for supplying liquid fuel to the vaporization chamber 2, and 6 is a jet of vaporized gas. A jet nozzle having a jet nozzle hole 6a, a connecting pipe 7 for connecting the vaporizing chamber 2 and the jet nozzle 6, and a needle valve device 8 for a needle pipe 8a, a needle 8b and a return valve 8
c, an electromagnetic control unit 8d, and the like.

Reference numeral 9 is a fuel return pipe whose tip portion is connected to the return side valve 8c, 10 is a pressing plate for connecting the fuel return pipe 9 to the needle valve device 8, and 11 is an electromagnetic pump 15 and a fuel tank provided in the oil pan 16. Oil pipe connecting with 17, 12
Is a thermistor for detecting the temperature of the carburetor 1, 13 is an air intake for taking in primary air, 14 is a burner head, 18
Is a heat shield plate that separates the combustion device side and the fuel tank side inside the device.

Reference numeral 19 denotes a flame holding ring which is in contact with the vaporizer 1 and surrounds the periphery of the burner head 14, 20 is a partition plate for partitioning the vaporizer 1 side and the combustion cylinder 21 side inside the apparatus, and 22 is a combustion cylinder 21. A heat insulating material provided between the partition plate 20 and 23 is a holding table for holding the carburetor 1, and the carburetor 1 is fixed together with the partition plate 20 by a screw 24, and is connected to the carburetor 1 inside thereof. Jet nozzle 6 and this jet nozzle 6
The needle valve device 8 connected to is stored. 25
Is a wind tunnel, 26 is a blower attached to the back of the device, 27
Is a casing and 27 is a hot air outlet.

Next, the operation will be described. First, an operation switch (not shown) is turned on to energize the preheat heater 4 to preheat the vaporizer 1 to a temperature required to vaporize the liquid fuel. When the preheating of the carburetor 1 is completed, the thermistor 12 detects this and the operation is started, the electromagnetic pump 15 is activated, and the liquid fuel is fed from the oil pan 16 to the oil feed pipe 1.
1, sent to the vaporization chamber 2 through the oil supply pipe 5, and the vaporization chamber 2
It is heated by and becomes vaporized gas.

When the vaporization chamber 2 is sufficiently filled with the vaporized gas, the needle valve device 8 is operated to shift to the original combustion operation, that is, the needle 8b is moved downward by the electromagnetic control section 8d. To open the nozzle hole 6a, close the return valve 8c, and eject the fuel gas from the nozzle hole 6a to the throat pipe 3. Due to the ejector effect, the fuel gas ejected from the nozzle hole 6a is a fixed amount of primary air determined by the nozzle hole diameter and the throat diameter, which is sucked from the air inlet 13 to become a mixed gas having a constant primary air ratio.

The mixed gas is ejected from the burner head 14 into the combustion cylinder 21 and ignited by an ignition source (not shown) to form a flame, which becomes high temperature combustion gas. And
This high-temperature combustion gas rises in the combustion cylinder 21, and the combustion cylinder 2
When the air flows out of 1, the hot air is mixed with the cold air sent from the air blower 26 and is discharged from the warm air outlet 28 in the front along the wind tunnel 25, thereby heating the room.
When the combustion is stopped, the nozzle hole 6a is closed by the needle 8b to stop the combustion operation, the return side valve 8c is opened, and the liquid fuel remaining in the carburetor 1 is passed through the fuel return pipe 9 to the oil receiving tray 16. Are returning.

[0008]

The above-described conventional liquid fuel combustion apparatus is constructed as described above, and noise is generated at a frequency of about 3 KHz when the fuel gas is ejected from the nozzle hole 6a during combustion. This noise is generated by the nozzle holes 6 during combustion.
It has been confirmed that the fuel gas at a temperature of about 250 ° C. is jetted into the atmosphere, is mixed with the atmosphere, is cooled, and is a jet noise generated when the gas is condensed.

As a method of reducing the jet noise (hereinafter referred to as ejector noise), an electric heater is newly provided near the air intake 13, and the electric heater heats the primary air to reduce the temperature difference from the fuel gas. Although there is a method of reducing the number, this method has a problem that the structure is complicated, the cost is increased, and the power consumption is increased.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid fuel combustion apparatus having a simple structure and capable of reducing ejector noise during combustion at low cost.

[0011]

In the liquid fuel combustion apparatus according to the present invention, a heat exchanger is provided around the nozzle for heating the primary air which receives heat from the vaporizer and is directed to the air intake. ..

Further, there is provided means for heating a part of the hot air discharged from the upper part of the combustion cylinder to the periphery of the nozzle while reheating the side wall of the combustion cylinder and heating the primary air toward the air intake.

[0013]

In the liquid fuel combustion apparatus configured as described above, the vaporized gas ejected from the nozzle can be mixed with the heated primary air, and the temperature difference at the time of mixing can be reduced.

[0014]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing the structure of an oil fan heater provided with a liquid fuel combustion apparatus of Example 1, and is a view corresponding to FIG. 9 showing a conventional apparatus. In the figure,
The same symbols as in FIG. 9 indicate the same parts, and 29 is a heat exchanger. The heat exchanger 29 is made of a material having good thermal conductivity and is formed in a tubular shape so as to form a passage for passing the primary air toward the air intake 13. The vaporizer 1 surrounds the ejection nozzle 6. Attached to the top of the bottom of the.

FIG. 2 is a perspective view showing an example of the structure of the heat exchanger 29 shown in FIG. 1. FIG. 2A shows a case in which a large number of directional fins 291 are provided on the inner wall of the cylinder, and primary air flows between the fins 291. It is configured to pass through and increase the heat exchange rate. Further, the heat exchanger 29 shown in FIG. 2B is provided with a large number of through holes 292 on the side surface of the cylinder, and the primary air passes through the through holes 292.

Next, the operation will be described. The operation from the start of combustion to the end of combustion is similar to that of the conventional device shown in FIGS. 8 to 10, and the description thereof is omitted here. Since the vaporizer 1 is generally made of a material having good thermal conductivity such as aluminum or brass, the temperature of the bottom is about 300 ° C. due to the heat received from the combustion flame during the heating operation. Therefore, the temperature of the heat exchanger 29 attached to the bottom of the vaporizer 1 so as to surround the jet nozzle 6 is 250 ° C. due to heat transfer from the bottom of the vaporizer 1 during the heating operation.
That's all. The temperature of the primary air reaching the air intake port 13 between the fins 291 shown in FIG. 2A and through the through holes 292 shown in FIG. 2B is determined by the shape and number of the fins 291 and the through holes 292. By setting efficiently
It can be heated to about 150 ° C.

FIG. 3 is a diagram showing the relationship between the temperature of the primary air reaching the ejection nozzle 6 and the ejector noise value. As shown in the figure, the ejector noise value is approximately 1.86 to the primary air temperature. It has been experimentally proved that they are proportional to each other. Therefore, by providing the heat exchanger 29 as in Example 1, the primary air temperature is set to about 150 ° C., and the ejector noise value is set to about 38 dB to 39 dB. Can be lowered to

In the above embodiment, the heat exchanger 29 is described as a separate structure from the carburetor 1. However, the heat exchanger 29 is integrated with the carburetor 1 by, for example, extending the bottom of the carburetor 1. It may be one.

Example 2. FIG. 4 is a side sectional view showing the structure of an oil fan heater provided with the liquid fuel combustion apparatus of the second embodiment, and is a drawing corresponding to FIGS. 1 and 9, and the same reference numerals as those in these drawings show the same parts. ing. As shown in FIG.
In the second embodiment, the heat exchanger 29 has a skirt portion 293 that expands outward at a lower end opening that serves as a guide port for primary air. That is, by forming the skirt portion 293, the contact area of the heat exchanger 29 with the primary air is increased, and at the same time, the heat capacity of the heat exchanger 29 itself is increased to further improve the heat exchange with the primary air. On the other hand, at the time of assembling and inspecting the parts, the field of view of the nozzle portion is widened, which facilitates the operation.

Example 3. FIG. 5 is a side sectional view showing the structure of an oil fan heater provided with the liquid fuel combustion apparatus of Example 3, where 31 is a guide plate and 32 is a guide.

FIG. 6 is a perspective view showing a part of the internal structure of the petroleum fan heater shown in FIG. 5 with the outer casing removed, and the same reference numerals as those in FIG.
Indicates the opening of the guide 32, and the arrow in the drawing indicates a part of the flow of warm air.

As shown in FIGS. 5 and 6, in the third embodiment, a guide plate 31 is attached around the combustion cylinder 21, and the blower 2 is installed.
A part of the warm air mixed with the cool air from 6 and discharged from the upper part of the combustion cylinder 21 to the front surface of the apparatus hits the wind tunnel 25 and flows between the guide plate 31 and the side wall of the combustion cylinder 21. The warm air that has flowed in is heated here,
It is configured to be sent from the opening 320 of the guide 32 to the inside of the support base 23 and to the vicinity of the ejection nozzle 6 to heat and raise the temperature of the primary air for combustion.

In the third embodiment, as described above, a part of the warm air is reheated on the side wall of the combustion cylinder 21 and is sent to the vicinity of the jet nozzle 6 to heat the primary air, so that the primary air for combustion is provided. It is supposed to raise the temperature of the air. Therefore, at the time of strong combustion with a large calorific value, the temperature of the primary air can be heated to about 200 ° C., and the ejector noise value can be reduced as in the first embodiment.

Example 4. FIG. 7 is a side sectional view showing the structure of an oil fan heater provided with a liquid fuel combustion apparatus according to Embodiment 4 of the present invention. In the fourth embodiment, as shown in FIG. 7, the heat exchanger 29 described in the first embodiment and part of the warm air described in the third embodiment are reheated on the side wall of the combustion cylinder 21 and the periphery of the ejection nozzle 6 It is configured to include both of the means for feeding into (the guide plate 31 and the guide 32 in the third embodiment). With such a configuration, the temperature of the primary air for combustion is further raised to 250 ° C. The above can be done. Therefore, as shown in FIG. 3, it is possible to reduce the noise by about 4 dB as compared with the conventional device having the same heat generation amount.

[0025]

Since the present invention is constructed as described above, it has the following effects.
The ejector noise value at the time of combustion can be reduced at a low cost with a simple configuration in which a heat exchanger that heats the primary air to raise the temperature of the primary air is provided around the ejection nozzle at the bottom of the vaporizer.
Further, the ejector noise value at the time of combustion can be reduced at a low cost with a simple configuration in which a part of the warm air is reheated on the side wall of the combustion cylinder and is sent to the vicinity of the ejection nozzle to heat the primary air. Furthermore, by providing both of these, a more remarkable effect can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing the structure of an oil fan heater equipped with a liquid fuel combustion apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration example of the heat exchanger shown in FIG.

FIG. 3 is a diagram showing a relationship between a temperature of primary air and an ejector noise value.

FIG. 4 is a side sectional view showing a configuration of an oil fan heater provided with a liquid fuel combustion apparatus according to a second embodiment of the present invention.

FIG. 5 is a side sectional view showing the structure of a petroleum fan heater equipped with a liquid fuel combustion apparatus according to a third embodiment of the present invention.

6 is a perspective view showing a part of the internal configuration of the device shown in FIG.

FIG. 7 is a side sectional view showing a structure of an oil fan heater provided with a liquid fuel combustion apparatus according to a fourth embodiment of the present invention.

FIG. 8 is a front sectional view showing the structure of an oil fan heater equipped with a conventional device.

9 is a side sectional view of the oil fan heater shown in FIG.

FIG. 10 is a partially enlarged cross-sectional view around the oil fan heater combustor machine shown in FIG.

[Explanation of symbols]

 1 Vaporizer 6 Jet Nozzle 21 Combustion Cylinder 23 Support Stand 29 Heat Exchanger 31 Guide Plate 32 Guide 291 Fin 292 Through Hole 293 Skirt 320 Opening

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teruo Sugimoto 8-1-1 Tsukaguchi Honcho, Amagasaki City, Hyogo Prefecture Sanryo Electric Co., Ltd. Central Research Laboratory (72) Inventor Sachiko Hagiwara Iwamatsu, Oshima Town, Nitta-gun, Gunma Prefecture 800 Address Sanryo Electric Co., Ltd. Gunma Works (72) Inventor Shigeru Wada Iwamatsu, Oshima-cho, Nitta-gun Gunma Prefecture 800 Address Sanryo Electric Co., Ltd. Gunma Works (72) Inventor Masako Takano Ojima-machi, Nitta-gun Gunma Prefecture 800 Iwamatsu, Sanryo Electric Co., Ltd. Gunma Works (72) Inventor Terue Mogi, Oshima-cho, Nitta-gun, Gunma Oita Iwamatsu 800 Sanyo Electric Co., Ltd. Gunma Works (72) Inventor Sanae Tomita, Nitta-gun, Gunma Prefecture Oshima-cho 800 Iwamatsu 800 Sanbishi Electric Co., Ltd.Gunma Seisakusho Co., Ltd. (72) Inventor Kiyoshi Nakagawa Oshima-cho Nitta-gun Gunma Prefecture 800 Iwamatsu 800 Sanbishi Machinery Co., Ltd. Gunma Works (72) Inventor Yuichi Taniguchi 800 Iwamatsu, Oshima-cho, Nitta-gun, Gunma Sanryo Electric Co., Ltd. Gunma Works (72) Inventor Tasami Usami 800 Iwamatsu, Ojima-machi, Nitta-gun, Gunma Prefecture Address Sanryo Electric Co., Ltd. Gunma Factory

Claims (8)

[Claims] 1. A liquid fuel which is combusted by supplying liquid fuel to a heated vaporizer to form vaporized gas, ejecting this vaporized gas from an ejection nozzle, mixing it with primary air by an ejector effect, and sending it to a combustion cylinder for combustion. The liquid fuel combustion apparatus, wherein the combustion apparatus includes a heat exchanger that receives heat from the vaporizer and heats the primary air around the ejection nozzle. 2. The liquid fuel combustion apparatus according to claim 1, wherein the heat exchanger is formed in a cylindrical shape and is attached to the vaporizer so as to surround the ejection nozzle. 3. The heat exchanger is formed in a cylindrical shape, is attached to the vaporizer so as to surround the periphery of the jet nozzle, and is provided with a number of vertical slits on the inner wall of the cylinder. Liquid fuel combustion device. 4. The heat exchanger is formed in a cylindrical shape, is attached to the vaporizer so as to surround the periphery of the jet nozzle, and is provided with a large number of through holes in the circumferential surface of the cylinder. Liquid fuel combustion device as described. 5. The heat exchanger is formed in a tubular shape, is attached to the vaporizer so as to surround the periphery of the jet nozzle, and a skirt portion that expands to the outside is formed at the inlet side opening of the primary air. The liquid fuel combustion apparatus according to claim 1. 6. The liquid fuel combustion apparatus according to claim 1, wherein the heat exchanger is formed integrally with a vaporizer. 7. A liquid fuel which is combusted by supplying liquid fuel to a heated vaporizer to form vaporized gas, ejecting this vaporized gas from an ejection nozzle, mixing it with primary air by an ejector effect, and sending it to a combustion cylinder for combustion. In the combustion device, a part of the hot air discharged from the upper part of the combustion cylinder is reheated on the side wall of the upper combustion cylinder, and is sent to the vicinity of the ejection nozzle to heat the primary air. Combustion device. 8. A liquid fuel combustion in which liquid fuel is supplied to a heated vaporizer to form vaporized gas, which is ejected from an ejection nozzle and mixed with primary air by an ejector effect to be sent to a combustion cylinder for combustion. In the apparatus, a heat exchanger that receives heat from the vaporizer to heat the primary air around the ejection nozzle and a part of warm air discharged from the upper part of the combustion cylinder is reheated by the side wall of the combustion cylinder. Meanwhile, the liquid fuel combustion apparatus is provided with means for reheating the primary air by sending it into the vicinity of the ejection nozzle.