KR100669220B1 - Gas combustion device - Google Patents

Abstract

The gas combustion device 1 comprises a combustor 7 for combusting the supplied combustion gas, an ejector 3 having a primary air hole for injecting primary air in the combustor 7 with an ejector effect, and the ejector The ignition apparatus 5 for igniting the mixed gas injected from the wick 25 provided in front of (3) is provided. The combustor 7 supplies secondary air to the gas combusted after ignition in the primary combustion chamber 11 and the primary combustion chamber 11 provided in the combustor which ignites and combusts the mixed gas ejected from the wick 25. The tertiary air is supplied to the secondary air hole 33 to supply, the secondary combustion chamber 13 which further burns the gas combusted in the primary combustion chamber 11, and the gas which burns in the secondary combustion chamber 13; It is composed of a tertiary air hole (35). Even if the amount of primary air is reduced to increase the ignition of the mixed gas, the combustion performance of the gas is improved because the secondary air is supplied to the gas after ignition in the primary combustion chamber 11.

Gas source, combustor, gas flow path, primary air hole, ejector, wick, ignition device, primary combustion chamber, secondary air hole, secondary combustion chamber, tertiary air hole.

Description

Gas Combustion Device {GAS COMBUSTION DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas combustion apparatus that generates completely burned hot air or warm air having high combustion efficiency by using combustion flame of liquefied petroleum gas (LPG) as a heat source.

Background Art Conventionally, gas combustion apparatuses that are incorporated in devices such as portable hair dryers or heat guns using LPG as a heat source are known.

1 to 3, for example, in the gas combustion device 10l incorporated in the hair dryer, a combustor 103 for burning gas is formed in the tubular casing 105 of the hair dryer. The combustor 103 burns the combustion gas supplied from the gas tank (not shown) in which fuel is stored. Air heated in the combustor 110 is discharged to the outlet side by a blower (not shown) provided at the inlet side of the casing 105.

1, the gas tank (not shown) and the combustor 103 are connected through the gas flow path 107. As shown in FIG. The pressure in the gas flow path 107 becomes negative pressure compared with the outside of the apparatus by the flow velocity of the combustion gas supplied to the combustor 103. At the end of the gas flow path 107, an ejector 111 having a suction port 109 for sucking outside air from the outside of the gas flow path 107 by using a difference between the pressure of the outside air and the pressure in the gas flow path 107. Is provided.

In detail, as shown in FIG. 2, in the ejector 111, for example, LPG supplied is injected at a high speed from the nozzle 113 in the ejector 111. Since the inside of the gas flow path 107 and the inside of the ejector 111 become negative pressure due to the ejector effect by the injection speed of the injected gas, outside air for mixing with the gas is introduced from the inlet 109. As a result, a mixed gas of injected gas and air is produced.

The mixed gas is injected from a wick 115 (gold mesh) provided inside the inlet side of the combustor 103. The spark generated from the spark plug 117 (ignition device) (refer to FIG. 3) by the high voltage blows into the wick 115 which injects the mixed gas, and the mixed gas is ignited.

The combustor 103 is arrange | positioned between the blower and the exit of the casing 105. As shown in FIG. 3, the cross-sectional shape orthogonal to the longitudinal direction of the combustor 103 has the wick 115 arrange | positioned at the center part of the gas combustion apparatus 101, and the 8 division | segment star around the wick 115. It is a non-circular cylindrical main body provided with eight radial combustion grooves 119 forming the shape of a projection (first conventional example: Japanese Patent Laid-Open No. 2002-233416).

In the conventional gas combustion apparatus 101, since the ejector 111 is formed to supply combustion gas to the combustor 103, the injection speed of the gas injected at high speed from the nozzle 113 in the ejector 111 By the ejector effect, the outside air is automatically sucked from the suction port 109. Therefore, a mixed gas of gas and air is generated and ejected from the surface of the wick 115, thereby promoting complete combustion.

However, the ignition performance of the mixed gas and the combustion performance of the combustion gas after ignition have an opposite relationship. That is, in order to improve the flammability of a gas, it is necessary to raise a gas ratio rather than the air mixing ratio in a mixed gas, but when it burns in the state with a high gas ratio, incomplete combustion gas will generate | occur | produce in large quantities and combustion performance will deteriorate. do. As a result, the C0 concentration increases.

On the contrary, when the amount of air is increased to lower the combustion efficiency and the gas ratio in the mixed gas is lowered, the combustion performance is improved, but there is a problem that it is difficult to ignite and cannot be burned.

In order to maintain a certain degree of ignition, even if the size of the inlet port 109 of the ejector 111 is reduced in order to reduce the amount of air sucked in, the air mixing ratio compared to the mixed gas having a good combustion efficiency for the reasons described above. There is a problem that the air is slightly deficient and the C0 concentration is high because of this decrease.

According to the second conventional example (Japanese Patent Application No. 2002-249347), the primary combustion chamber for burning the mixed gas ejected from the wick and the secondary air from the outside air are combusted by supplying the gas burned in the primary combustion chamber. A combustor comprised of a secondary combustion chamber was disclosed, and it was confirmed to promote complete combustion of the combustion gas in the secondary combustion chamber.

However, also in the said 2nd conventional example, CO concentration is high and there exists room for improvement.

This invention is made | formed in order to solve the above-mentioned subject, Comprising: It aims at providing the gas combustion apparatus which can improve the ignition property of gas, can improve the combustion performance of gas, and can reduce C0 concentration.

In order to achieve the above object, according to the gas combustion apparatus of the present invention, a combustor for combusting a combustion gas supplied from a gas supply source, a gas flow path for sending gas from the gas supply source to the combustor, and Ignition of an ejector having a primary air hole for suctioning primary air due to the negative pressure generated by the flow rate of the combustion gas supplied to the combustor, and of a mixed gas injected from a wick installed in front of the ejector Is installed in the combustor for supplying secondary air to the gas combusted after the ignition in the primary combustion chamber, the primary combustion chamber installed in the combustor for ignition combustion of the mixed gas ejected from the wick. Secondary air holes, the secondary gas to the gas burnt in the primary combustion chamber The group in the secondary combustion chamber, and a base-part that tertiary air hole for supplying the tertiary air to the gas burning in the secondary combustion chamber for additional burning a mixture of a secondary air sucked in through the hole portion.

1 is a side view of a conventional gas combustion apparatus.

2 is a partial cross-sectional view of the ejector of FIG. 1.

FIG. 3 is a front view of the gas combustion device seen from the left side of FIG. 1.

4 is a cross-sectional view taken along the line IV-IN of FIG. 6 of the gas combustion apparatus according to the embodiment of the present invention.

5 is a side view of a gas combustion apparatus according to an embodiment of the present invention.

FIG. 6 is a front view of the gas combustion device viewed from the left side of FIG. 5.

FIG. 7 is a rear view of the gas combustion device viewed from the right side of FIG. 5.

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

Referring to FIG. 4, the gas combustion device 1 according to the present embodiment is generated by an ejector 3 and an ejector 3 for generating a mixed gas by mixing LPG and air as combustion gases, for example. For example, an electrode 5 as an ignition device for igniting the mixed gas and a combustor 7 for burning the mixed gas ignited by the electrode 5 are provided.

The chamber 9 of the combustor 7 is made of aluminum (die-cast), and is a cylindrical body in which the left and right sides in the longitudinal direction of the combustor 7 are substantially circular as shown in FIGS. 6 and 7. The inside of the chamber 9 consists of the primary combustion chamber 11 located in the right side in FIG. 4, and the secondary combustion chamber 13 located in front of this primary combustion chamber 11 (left side in FIG. 4). It is. The ejector 3 is attached to the gas introduction side of the rear of the primary combustion chamber 11 (right side in FIG. 4).

The ejector 3 described above is used as a gas flow path from a gas supply source such as a gas tank (not shown) storing, for example, LPG as combustion gas, on the inlet side of the ejector main body 15 having a substantially cylindrical cross section. For example, the nozzle 19 which injects the gas supplied through the gas supply line 17 is formed.

The tip of the nozzle 19 is provided with a pinhole injection hole (not shown) having a diameter of, for example, φ60 μm to φ200 μm. This injection hole is an orifice provided in the center of a disk-shaped pinhole disk (not shown), and LPG is discharged from the injection hole at a high speed close to the speed of sound. In addition, a filter (not shown) is built in the nozzle 19 to remove impurities and garbage that close the injection hole. As a filter, the sintered metal etc. which have a pinhole of 10-30 micrometers diameter are used, for example.

In the ejector l5 in front of the nozzle 19, a mixer 21 for mixing LPG with primary air and introducing the combustor 7 into the combustor 7 is provided. The primary air hole 23 for perforating primary air is perforated. Therefore, the inside of the mixer 21 becomes negative pressure by the combustion gas discharged | emitted from the said nozzle 19 at high speed, and primary air is sucked in and mixed with combustion gas, for example, the wick 25 as a front gas combustion part. Is sent). This is called the ejector effect. By adjusting the area of the primary air hole 23, the proportion of primary air can be adjusted.

The wick 25 has a cylindrical shape in a 50-150 mesh SUS mesh as a gas combustion part, and is attached to the front end of the ejector 15 by welding, for example. 4 is formed in a substantially central portion on the right side of the primary combustion chamber 11 of FIG. Moreover, the wick holder 27 as a straight restraining part is attached to the front end of the wick 25 by welding, for example. By the wick holder 27, straightness of the mixed gas discharged from the mixer 21 is suppressed, and outflow to the side (arrow AR1 direction in Fig. 4) is mainly promoted, so that LPG and The mixed gas of air is discharged. The flame after ignition is blue and becomes circular.

The above-mentioned electrode 5 is formed in the combustor 7 in the front of the wick 25 and in the vicinity of the side surface. The high voltage electricity generated by the piezoelectric element for ignition (not shown) is input to the electrode 5 by the electric wire 29, and a flame blows from the tip of the electrode 5 to the wick 25. The flame ignites the mixed gas from the wick 25, and the gas burns.

Referring to FIG. 6, on the inner wall of the primary combustion chamber 11, a plurality of groove portions 31 extending in the front-rear direction are arranged in the radial direction around the wick 25. In FIG. 6, six groove portions 31 are formed.

In addition, a plurality of secondary air holes 33 are formed in the rear wall (right wall in FIG. 4) of the primary combustion chamber 11 to supply secondary air from the outside air to the primary combustion chamber 11. . The plurality of secondary air holes 33 are arranged to supply secondary air at a position slightly away from the circumference of the wick 25. In other words, the secondary air is arranged to be supplied to the gas after ignition at a position which does not affect the mixed gas immediately after exiting the wick 25, that is, at a position other than the ignition portion. The said ignition part is a range of the part which the flame which arose in the electrode 5 blows, and is shown in the electrode 5 side of the wick 25 as shown by the range enclosed by the dotted line of FIG. In this embodiment, five secondary air holes 33 are formed in total so that the secondary air is supplied from the rear side of each of the other groove portions 31 except for the groove portion 31 on which the electrode 5 is mounted. It is.

For example, a plurality of tertiary air conduits 35, which are tertiary air holes for supplying tertiary air from outside air to the secondary combustion chamber 13, have walls of the primary combustion chamber 11 between the grooves 31. It is formed inside. In this embodiment, six tertiary air lines 35 are provided in total.

By adjusting the area of the primary air hole 23 of the ejector 3, the ratio of primary air can be adjusted. In order to improve the ignition of the mixed gas ejected from the wick 25, in this embodiment, the area of the primary air hole 23 is configured to be approximately half the area of the conventional primary air hole. For example, if the hole diameter of the conventional primary air hole is D, the hole diameter of the primary air hole 23 of the present embodiment is 0.73D.

The hole diameter of each of the five secondary air hole portions 33 is 0.4D, and the hole diameter of each of the six tertiary air pipes 35 (the third air hole portion) is D.

On the outer circumferential side of the chamber 9, a plurality of fins 37 for heat exchange are formed. The fins 37 release heat generated when the mixed gas burns in the chamber 9 to cool the chamber 9, that is, have an effect of heat exchange.

By the above configuration, when LPG is supplied into the nozzle 19 of the ejector 3 via the gas supply pipe 17, the LPG passes through a filter in the nozzle 19 to the sound velocity from the injection hole, which is an orifice, to the mixer 21. Since it is ejected at a close speed, the inside of the mixer 21 becomes negative pressure by the ejector effect, so that the primary air (corresponding to the fuel ratio) required for combustion is sucked from the primary air hole 23 and into the mixer 21. It flows in, and this inflow of primary air and LPG are mixed, it becomes a mixed gas, and it blows out to the front wick 25.

In the mixer 21, primary air required for combustion is automatically sucked in proportion to the increase and decrease of the LPG. In addition, by reducing the diameter of the primary air by reducing the hole diameter of the primary air hole 23, a mixed gas having good ignition is injected into the front wick 25.

In the wick 25, since the wick holder 27 is formed in the front end surface, the combustion gas (mixed gas) is mainly blown off from the SUS mesh of the side mesh.

Subsequently, when a high voltage is supplied through the electric wire 29, a spark is generated from the electrode 5 in the combustor 7, and it reliably ignites the mixed gas of the gas ratio suitable for the ignition blown out from the wick 25. Most of the combustion flame of the complexed gas spreads outward from the side of the wick 25 in a circular shape, and the length of the combustion flame is maintained about tens of millimeters from the wick 25, so that the warm air is inside the primary combustion chamber 11. And the front secondary combustion chamber 13 along the eight grooves 31 of the inner wall.

At this time, the mixed gas from the wick 25 has a high gas ratio, so that the ignition is good, but the C0 concentration increases, and the combustion performance is lowered. However, since the secondary air hole 33 is provided in a place other than the ignition part, the air amount other than the ignition part in the primary combustion chamber 11 increases, and the C0 concentration decreases. That is, since secondary air is supplied to the combustion gas after ignition in the primary combustion chamber 11, the combustion efficiency of the gas in the primary combustion chamber 11 improves, and combustion performance improves. Therefore, in the primary combustion chamber 11, the mixed gas from the wick 25 reliably ignites, the combustion performance of the combustion gas after ignition is accelerated | stimulated, and C0 concentration falls.

Further, by tertiary air from outside air passing through six tertiary air conduits 35 (tertiary air holes), the temperature of the wall of the primary combustion chamber 11 can be lowered efficiently, and the tertiary air conduits High temperature tertiary air is introduced into the secondary combustion chamber 13 through 35. Therefore, the gas in the secondary combustion chamber 13 also accelerates the combustion reaction and improves the combustion performance. That is, in the primary combustion chamber 11, the gas which has been burned and the high temperature tertiary air are mixed, so that the combustion reaction is easy and complete combustion is promoted. By such a configuration, combustion performance is improved. As described above, the tertiary air has the effect of lowering the temperature of the primary combustion chamber 11 and the improvement of the combustion performance in the secondary combustion chamber 13. The number of the tertiary air conduits 35 is preferably eight in order to achieve both combustion performance and heat exchange.

As mentioned above, according to the gas combustion apparatus 1 of the Example of this invention, since most of the gas which is not combusted burns in the secondary combustion chamber 13, a flame does not come out of the chamber 9 outside.

In order to verify the performance of the present invention, the concentration of CO after combustion of the gas combustion device of the second conventional example and the gas combustion device 1 of the present embodiment was measured under the same conditions. Was 94 ppm, but in the present example, it was 41 ppm. Moreover, in the case of condition 2, although it was 119 ppm in the 2nd conventional example, it was 49 ppm in this Example.

Therefore, in this embodiment, not only the tertiary air is supplied into the secondary combustion chamber 13 but also the secondary air is supplied into the primary combustion chamber 11, and it was confirmed that C0 concentration decreases. In the combustor of the second embodiment, similarly to the present embodiment, tertiary air is supplied into the secondary combustion chamber 13 of the combustor 7, but secondary air is not supplied into the primary combustion chamber 11.

In addition, this invention is not limited to the Example mentioned above, It can implement in another aspect by making a suitable change. The gas combustion device 1 of the present embodiment is used as a gas combustion device such as a hair dryer, a heat gun used for shrinking work of a heat shrink tube, drying, bonding, melting, soldering, or the like, or other equipment. It is possible.

According to the present invention, even if the primary air amount is reduced to increase the ignition of the mixed gas from the wick, the secondary air is supplied to the gas after ignition in the primary combustion chamber to improve the combustion efficiency of the combustion gas in the primary combustion chamber. It is possible to improve the combustion performance. In addition, in the secondary combustion chamber, since tertiary air is introduced from the tertiary air hole, the combustion reaction can be further promoted, and the combustion performance can be improved. Therefore, it can be made easy to burn completely, and CO concentration can be reduced.

In addition, by reducing the hole diameter of the primary air hole, the amount of primary air can be reduced to increase the gas ratio, so that the ignition of the mixed gas from the wick can be improved.

In addition, since the secondary air hole is provided in a place other than the ignition part in the primary combustion chamber, the amount of air other than the ignition part can be increased to improve the combustibility of the gas without impairing the ignition of the ignition part in the primary combustion chamber, Can reduce the C0 concentration.

Claims (3)

A combustor for combusting combustion gases supplied from a gas source, A gas flow path for sending gas from the gas supply source to the combustor, An ejector having a primary air hole for sucking primary air due to a negative pressure generated by a flow rate of combustion gas supplied to the combustor in the gas flow path, Ignition device for igniting the mixed gas injected from the wick installed in front of the ejector, A primary combustion chamber installed in the combustor which ignites and combusts the mixed gas ejected from the wick, Secondary air holes provided in the combustor for supplying secondary air to the gas combusted after the ignition in the primary combustion chamber, A secondary combustion chamber for further burning by mixing the secondary air sucked from the secondary air hole with the gas burnt in the primary combustion chamber; Tertiary air holes for supplying tertiary air to the gas burning in the secondary combustion chamber Gas combustion apparatus comprising a. The method of claim 1, And the primary air hole is provided with a small diameter to increase the ignition of the mixed gas injected from the wick. The method according to claim 1 or 2, The said secondary air hole part is provided in the position which supplies secondary air to combustion gas other than an ignition part, The gas combustion apparatus characterized by the above-mentioned.

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