KR0121160B1 - Liquid Fuel Combustion Device - Google Patents

Abstract

The present invention relates to a liquid fuel combustion device having a jet nozzle, which has a simple configuration and heat exchanger for heating primary air by receiving heat conduction from the vaporizer 1 around the jet nozzle 6 in order to reduce the ejector noise at low cost. A flag 29 was prepared. Moreover, the means which sends a part of warm air discharged from the upper part of the combustion cylinder 21 to the injection nozzle 6 surrounding, while reheating in the combustion cylinder side wall was provided.

By using such a device, the vaporized gas sprayed from the spray nozzle 6 and the heated primary air can be mixed, and the ejector noise value can be reduced to about 4 dB by reducing the temperature difference at the time of mixing.

Description

Liquid Fuel Combustion Device

1 is a side cross-sectional view showing the configuration of a petroleum fan heater provided with the liquid fuel combustion device of Embodiment 1 of the present invention.

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

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

4 is a side cross-sectional view showing the configuration of a petroleum fan heater provided with the liquid fuel combustion device of Embodiment 2 of the present invention.

5 is a side cross-sectional view showing the configuration of a petroleum fan heater provided with the liquid fuel combustion device of the third embodiment of the present invention.

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

7 is a side cross-sectional view showing the configuration of a petroleum fan heater provided with the liquid fuel combustion device of the fourth embodiment of the present invention.

8 is a front sectional view showing the configuration of a petroleum fan heater equipped with a conventional apparatus.

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

10 is a partially enlarged cross-sectional view of the oil fan heater combustion apparatus shown in FIG.

* Explanation of symbols for the main parts of the drawings

1: carburetor 6: jet nozzle

21: combustion cylinder 23: support

29: heat exchanger 31: guide plate

32: Guide 291: 휜

292 through hole 293 skirt portion

320: open hole

The present invention relates to a liquid fuel combustion device having a jet nozzle.

FIG. 8 is a front sectional sectional view showing the structure of a conventional petroleum fan heater equipped with a liquid fuel combustion device, FIG. 9 is a side cross-sectional view thereof, and FIG.

In each drawing, reference numeral 1 denotes a vaporizer which vaporizes liquid fuel, 2 denotes a ring-shaped vaporization chamber formed in the vaporizer 1, 3 denotes a wooden tube integrally formed with the vaporizer 1, and Preheating heater embedded in the vaporizer 1, (5) is an oil supply pipe for supplying liquid fuel to the vaporization chamber (2), (6) a jet nozzle having a jet nozzle hole (6a) for ejecting the vaporized gas (7) is a connecting pipe connecting the vaporization chamber (2) and the ejection nozzle (6), (8) is a needle valve device as a needle pipe (8a), needle (8b), return side valve (8c) and the electronic control unit (8d) and the like.

(9) is a fuel return pipe whose front end 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), (11) the oil sump (16) Oil supply pipe connecting the electronic pump 15 and the fuel tank 17 provided in the (12), the dummy (12) for detecting the temperature of the vaporizer 1, (13) the air inlet for introducing the primary air, ( 14 is a burner head, and 18 is a heat shield plate which intersects a combustion apparatus side and a fuel tank side inside the apparatus.

19 is a flame ring which wraps the inside of the burner head 14 in contact with the vaporizer 1, and 20 is a partition plate between the vaporizer 1 side and the combustion cylinder 21 side inside the apparatus. (22) is a heat insulating agent provided between the combustion cylinder 21 and the partition plate (20), (23) is a holder for holding the carburetor (1), the vaporizer 1 by the screw 24 It is fixed together with 20, and therein is housed the jet nozzle 6 connected to the vaporizer 1, and the needle valve apparatus 8 connected to this jet nozzle 6.

Reference numeral 25 denotes a wind tunnel, 26 a blower attached to the rear of the apparatus, 27 a casing, and 27 a hot air outlet.

Next, the operation will be described.

First, the operation switch (not shown) is turned ON, and the preheat heater 4 is energized to preheat the vaporizer 1 to a temperature necessary for vaporizing the liquid fuel. When the preheating of the vaporizer 1 is completed, the dummyster 12 detects this and starts operation. The electronic pump 15 is operated so that the liquid fuel is supplied from the oil sump 16 to the oil feed pipe 11 and the oil feed pipe 5. ) Is sent to the vaporization chamber 2, and is heated in the vaporization formula (2) to become vaporized gas.

Then, the needle valve device 8 operates so as to shift to the original combustion operation when the vaporization chamber 2 is sufficiently filled with the vaporization gas, that is, the needle 8b is slid downward in the electronic control unit 8d so that the nozzle The hole 6a is opened, the return side valve 8c is closed, and the fuel gas is ejected from the nozzle hole 6a to the wood pipe 3.

The fuel gas ejected from the nozzle hole 6a is drawn into the air inlet 13 by a predetermined amount of primary air, which is determined by the ejector effect and determined by the nozzle hole diameter and the neck diameter, thereby becoming a mixed gas having a constant primary air ratio.

The mixed gas is blown from the burner head 14 into the combustion cylinder 21, and ignited by an ignition source (not shown) to form a flame to become a high temperature combustion gas. Then, the high temperature combustion gas rises the combustion cylinder 21 and mixes with the cold air sent from the blower 26 from the place where the combustion cylinder 21 exits, and becomes the warm air, and the hot air outlet in front of the wind tunnel 25 is formed. It is discharged from (28) and is heating the room by this.

When the combustion is stopped, the nozzle 8a is blocked by the needle 8b to stop the combustion operation, and the return valve 8c is opened to release the liquid fuel remaining in the vaporizer 1 through the fuel return pipe 9. Return to the sump (16).

The conventional liquid fuel combustion device as described above is constituted as described above, and when the fuel gas is ejected from the nozzle hole 6a at the time of combustion, noise around 3 KHz is generated. It is confirmed that this noise is a blowing sound generated when fuel gas of about 250 ° C. is ejected into the atmosphere from the nozzle hole 6a during combustion, mixed with the atmosphere, cooled, and condensed.

As a method of reducing the blowout noise (hereinafter referred to as ejector noise), a new electric heater is provided in the vicinity of the air inlet 13, and the primary heater is heated to reduce the temperature difference from the fuel gas. Although there is a method, this method has a problem in that the structure is complicated or the cost is high and power consumption is also large.

An object of the present invention is to solve such problems, the simple configuration, and in the liquid fuel combustion device that can reduce the ejector noise during combustion at low cost, the first direction that receives heat transfer from the vaporizer around the nozzle to the air inlet The heat exchanger which heats air is provided.

In addition, a portion of the warm air discharged from the upper portion of the combustion cylinder is sent to the vicinity of the nozzle while reheating the combustion cylinder side wall, and means for heating the primary air directed to the air inlet are provided.

In the liquid fuel combustion device configured as described above, the vaporized gas ejected from the nozzle and the heated primary air can be mixed, so that the temperature difference during mixing can be reduced.

Example 1

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view showing the configuration of a petroleum fan heater provided with the liquid fuel combustion device of Embodiment 1, which corresponds to FIG. 9 showing a conventional device.

In the drawings, the same reference numerals as those in FIG. 9 denote the same parts, and reference numeral 29 denotes a heat exchanger. The heat exchanger 29 is formed of a tubular shape so as to form a passage through which primary air is directed to the air inlet 13 by a material having good thermal conductivity, and the vaporizer 1 to surround the jet nozzle 6. ) Is attached to the top of the bottom part.

FIG. 2 is a perspective view showing an example of the configuration of the heat exchanger 29 shown in FIG. 1, and FIG. 2 (A) provides fins 291 in various directions on the inner wall of the cylinder and between the fins 291. It is configured to increase the heat exchange rate through the primary air.

Moreover, the heat exchanger 29 shown in FIG. 2 (B) is provided with several through-holes 292 in the cylinder side surface, and is comprised so that a primary air may pass through each through-hole 292. FIG.

Next, the operation will be described.

The operation from the start of combustion to the stop of combustion is the same as the conventional apparatus shown in Figs. 8 to 10, and the description thereof is omitted here.

In general, since the vaporizer 1 is formed of a material having good thermal conductivity such as aluminum or brass, the temperature of the bottom portion 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 to surround the jet nozzle 6 is 250 ° C. or more due to the heat conduction at the bottom of the vaporizer 1 during heating operation. do.

The temperature of the primary air reaching the air inlet 13 through the through yarn 291 shown in FIG. 2A or through hole 292 shown in FIG. 291), the number of through holes 292, and the like can be set efficiently so as to be heated to about 150 deg.

3 shows the relationship between the temperature of the primary air reaching the ejection nozzle 6 and the ejector noise value. As shown in the drawing, the ejector noise is proportional to about 1.86 power of the temperature of the primary air. As a result of the experiment, it is possible to reduce the ejector noise value by about 38 dB to 39 dB by buying the temperature of the primary air at about 150 ° C by providing the heat exchanger 29 as in the first embodiment.

In addition, although the heat exchanger 29 is demonstrated in a separate structure from the vaporizer | carburetor 1 in the said embodiment, even if it is integral with the vaporizer | carburetor 1, for example, it extends and comprises the bottom part of the vaporizer | carburetor 1, good.

Example 2

4 is a side cross-sectional view showing the configuration of a petroleum fan heater provided with the liquid fuel combustion device of Example 2, corresponding to FIGS. 1 and 9, with the same reference numerals as those shown in FIG.

As shown in FIG. 4, in this Embodiment 2, the heat exchanger 29 forms the skirt part 293 which spreads outward in the open hole part of the lower end used as the guide of primary air.

That is, by forming the skirt portion 293, the heat exchanger 29 increases the contact area with the primary air, and also increases the heat capacity of the heat exchanger 29 itself to further heat exchange the primary air. On the other hand, when the parts are assembled or inspected, the boundary of the nozzle portion becomes wider, so that it can be easily performed.

Example 3

5 is a side sectional view showing the configuration of a petroleum fan heater provided with the liquid fuel combustion device of the third embodiment, wherein 31 is a guide plate and 32 is a guide.

FIG. 6 is a perspective view showing a part of the internal structure in which the outer casing is removed in the petroleum fan heater shown in FIG. 5, and the same reference numerals as those in FIG. 5 denote the same parts, and 320 is the guide 32. An open hole in the drawing, the arrow in the drawing shows part of the flow of warm air.

5 and 6, in the third embodiment, the guide plate 31 is attached to the periphery of the combustion cylinder 21, mixed with cold air from the blower 26, and the side wall of the combustion cylinder 21 is shown. It is configured to flow in between, and the warm air introduced therein is heated, sent from the open hole portion 320 of the guide 32 into the support 23, and sent to the periphery of the jet nozzle 6, 1 It is supposed to increase the temperature of the primary air for combustion by providing a means for heating the secondary air.

Therefore, during strong combustion with a large amount of heat generated, the temperature of the primary air can be heated to about 200 ° C., and the ejector noise can be lowered as in the first embodiment.

Example 4

7 is a side sectional view showing the configuration of a petroleum fan heater provided with the liquid fuel combustion device of the fourth embodiment of the present invention.

In the fourth embodiment, as shown in FIG. 7, a part of the heat exchanger 29 described in the first embodiment and a part of the warm air described in the third embodiment is reheated in the side wall of the combustion cylinder 21 while sending the ejection nozzle 6 to the vicinity. The means (the guide plate 31 and the guide 32 in the third embodiment) is configured to have both of them. By such a configuration, the temperature of the primary air for combustion can be further increased to be 250 ° C or more. Can be.

Therefore, as shown in FIG. 3, the quietness of about 4 dB can be achieved as compared with the conventional apparatus having the same heat generation amount.

Since this invention is comprised as mentioned above, it has the effect as described below.

It is a simple structure which provides the heat exchanger which raises the temperature of a primary air by heating primary air around the ejection nozzle of the lower part of a vaporizer, and can reduce the ejector noise value at the time of combustion at low cost.

Moreover, it is a simple structure which sends a part of warm air to a blowing nozzle periphery, reheating in a combustion cylinder side wall, and provides the means for heating a primary air, and can reduce the ejector noise value at the time of combustion at low cost.

Moreover, a more remarkable effect can be acquired by providing both of these.

Claims (8)

The liquid fuel is supplied to the heated vaporizer 1 to be a vaporized gas. The vaporized gas is ejected from the jet nozzle 6, mixed with primary air by the ejector effect, and sent to the combustion cylinder 21 to perform combustion. A liquid fuel combustion device comprising a heat exchanger (29) for heating the primary air by receiving heat transfer from the vaporizer (1) around the jet nozzle (6). The liquid fuel combustion device according to claim 1, wherein the heat exchanger (29) is formed in a cylindrical shape and attached to the vaporizer (1) so as to surround the ejection nozzle. 2. The heat exchanger (29) according to claim 1, wherein the heat exchanger (29) is formed in a tubular shape, attached to the vaporizer (1) so as to surround the ejection nozzles, and a plurality of longitudinal slits are formed in the inner wall of the cylinder. Liquid fuel combustion device. 2. The heat exchanger (29) according to claim 1, characterized in that the heat exchanger (29) is formed in a cylindrical shape, attached to the vaporizer (1) so as to surround the ejection nozzle, and a plurality of through holes (292) are formed in the cylindrical circumferential surface. Liquid fuel combustion apparatus. 2. The skirt according to claim 1, wherein the heat exchanger (29) is formed in a tubular shape, and is attached to the vaporizer (1) so as to surround the ejection nozzles, and at the same time, the skirt is widened outwardly in the inlet opening of the primary air. Liquid fuel combustion apparatus, characterized in that the portion (293) formed. The liquid fuel combustion device according to claim 1, wherein the heat exchanger (29) is formed integrally with the vaporizer (1). The liquid fuel is supplied to the heated vaporizer 1 to be a vaporized gas. The vaporized gas is ejected from the jet nozzle 6, mixed with primary air by the ejector effect, and sent to the combustion cylinder 21 to perform combustion. In the liquid fuel combustion device, a portion (31, 32) of heating the primary air by sending a portion of the warm air discharged from the upper portion of the combustion cylinder to the vicinity of the ejection nozzle (6) while reheating the upper combustion cylinder side wall. Liquid fuel combustion apparatus, characterized in that. The liquid fuel is supplied to the heated vaporizer 1 to be a vaporized gas. The vaporized gas is ejected from the jet nozzle 6, mixed with primary air by the ejector effect, and sent to the combustion cylinder 21 to perform combustion. In the liquid fuel combustion device, a heat exchanger (29) for heating the primary air by receiving heat transfer from the vaporizer (1) around the jet nozzle, and part of the warm air discharged from the upper portion of the combustion cylinder (21). And (31,32) means for reheating the primary air by sending it to the periphery of the jet nozzle (6) while reheating the combustion cylinder sidewall.