KR20050118675A - Gas combustion-controlling method and gas combustion device - Google Patents

Abstract

A gas combustion device (1) has a combustor (11) for burning a fuel gas fed from a gas-feeding source, a blower (15) for regulating the amount of air inside a tubular casing (5) in which the combustor (11) is installed, an ejector (7) with a primary- air hole (37), and an igniter (9) for igniting a mixture gas jetted from a wick (39) provided forward of the ejector (7). The primary-air hole (37) sucks primary air into a gas flow path that is led from the gas-feeding source to the combustor (11), the sucking being induced by negative pressure produced by a flow speed of the fuel gas fed to the combustor (11). To ignite the mixture gas from the wick (39), the amount of air inside the casing (5) is reduced to increase the ignitability of the mixture gas. Once ignited, combustion is sustained with the combustibility of the fuel gas in the combustor (11) increased by an increased amount of air in the casing (5).

Description

GAS COMBUSTION-CONTROLLING METHOD AND GAS COMBUSTION DEVICE

In particular, the present invention relates to a gas combustion device that generates hot air or warm air that is completely burned by using a combustion flame of liquefied petroleum gas (LPG) as a heat source.

Conventionally, a gas combustion device is incorporated in apparatuses, such as a portable hair dryer using a LPG, a heat gun, etc., for example.

1 to 4, for example, in the gas combustor 103 incorporated in the hair dryer 101, a combustor 105 combusting gas is a tubular casing 107 of the hair dryer 101. It is installed inside. The combustor 105 burns fuel gas supplied from a gas tank (not shown) as a gas supply source, so that the air heated in the combustor 105 is installed through the bracket 109 on the inlet side of the casing 107. ) And a blower 115 formed of a fan 113 mounted on the motor 111, and flows out to the outlet 117 side.

In the gas flow passage 119 from the gas tank to the combustor 105, an ejector having a suction port 121 for sucking outside air due to the negative pressure generated by the flow rate of the fuel gas supplied to the combustor 105 ( 123 is provided. As shown in FIG. 3, in the ejector 123, the supplied, for example, LPG is injected at a high speed by the nozzle 125 in the ejector 123. The negative pressure is generated by the ejector effect due to the injection speed of the gas, the outside air necessary for combustion is introduced from the suction port 121, and a mixed gas of gas LPG and air is generated.

The mixed gas is ejected from the wick 127 (metal mesh) provided inside the inlet side of the combustor 105, and the spark generated from the ignition plug 129 (ignition device) is wicked by the high voltage. It is blown to 127 and is ignited by the mixed gas which ejected.

The combustor 105 is arrange | positioned between the blower 115 and the outlet 117 of the casing 107, and the wick 127 has the cross-sectional shape orthogonal to the longitudinal direction of the combustor 105 as shown in FIG. It is a non-cylindrical cylindrical body having eight grooved combustion chambers 131 radially arranged in a central direction and formed in a radial direction around the wick 127 to form a star-shaped projection of eight divisions. 2002-233416).

By the way, as shown in FIG. 1, in the process of igniting and burning the fuel gas using the conventional gas combustion apparatus 103, the fuel gas LPG ejector is carried out in the state in which the air volume by the blower 115 became constant. A process supplied to the 123, a process in which outside air is sucked from the suction port 121 of the ejector 123, a process in which a mixed gas of fuel gas and air is generated and ejected from the surface of the wick 127, and ignition The flame from the plug 129 (ignition device) is ignited by the mixed gas ejected from the wick 127 and combusted inside the combustor 105, and the combustion air is discharged toward the outlet 117 as warm air. It includes. This combustion condition lasts until the LPG supply is cut off.

However, the above-mentioned ignition performance of the mixed gas and the combustion performance of the combustion gas after ignition are in opposite relations. In other words, in order to improve the ignition performance of the gas, it is necessary to increase the gas ratio in the mixed gas. However, when the gas ratio is combusted in a high state, a large amount of incomplete combustion gas is generated and the combustion performance is deteriorated. As a result, the C0 concentration increases.

On the contrary, in order to improve the combustion performance, if the gas ratio is decreased by increasing the amount of air in the mixed gas, the combustion performance is good, but there is a problem that it is difficult to ignite because the amount of air is large, and combustion cannot be started.

In the conventional gas combustion apparatus, since the air is always burned by a constant air amount supplied by the blower 115, there is a problem that it is difficult to form a mixed gas to sufficiently satisfy both the ignition performance and the combustion performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a gas combustion control method and a gas combustion apparatus capable of improving the ignition property of the gas, improving the combustion performance of the gas, and reducing the C0 concentration. For the purpose of

1 is a schematic explanatory diagram showing gas combustion of a conventional gas combustion apparatus.

2 is a side cross-sectional view of a hair dryer incorporating a conventional gas combustion device.

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

4 is a front sectional view of the combustor along line IV-IV of FIG.

5 is a schematic explanatory diagram showing gas combustion in a gas combustion apparatus according to an embodiment of the present invention.

6 is a side cross-sectional view along line VI-VI of FIG. 7 of a gas combustion apparatus according to an embodiment of the present invention.

7 is a front sectional view of the gas combustion device seen from the left side of FIG.

FIG. 8 is a rear cross-sectional view of the gas combustion device viewed from the right side of FIG. 6.

9 is a flowchart showing a control method in the present invention.

In order to achieve the above object, a combustor combusting fuel gas supplied from a gas supply source, an air amount adjusting device for adjusting an air amount in a cylindrical casing incorporating the combustor, and a fuel gas supplied to the combustor from the gas supply source And a wick for ejecting the mixed gas mixed with the air in the casing into the combustion chamber, an ignition device for igniting the mixed gas ejected from the wick, a control device for controlling the air amount adjusting device and the ignition device. A gas combustion control method in a gas combustion apparatus, comprising: a first air amount adjusting step of controlling the air adjusting device to reduce the amount of air in the casing in a state before the mixed gas ejected from the wick is ignited; and the mixing After the ignition step of igniting the gas and the ignition step, the k It is a main subject to include the 2nd air amount adjustment process which operates the said air amount adjustment apparatus at a higher output than at the said 1st air amount adjustment process so that the air amount in a bowl may be increased.

Moreover, in order to achieve the said objective, the gas combustor of this invention is a combustor for combusting the fuel gas supplied from the gas supply source, the air volume adjusting device which adjusts the air volume in the cylindrical casing which incorporates the said combustor, and A wick for ejecting a mixed gas of a fuel gas supplied to the combustor and a gas in the casing from a gas source into the combustion chamber, an ignition device for igniting the mixed gas ejected from the wick, and a mixed gas in the combustor. And an ignition detection device for detecting ignition and a control device for controlling the air amount adjusting device and the ignition device at least in accordance with a signal from the ignition detection device, wherein the control device detects ignition in the ignition detection device. If not, the air amount to reduce the amount of air in the casing It is a main point that the air amount adjusting device is controlled so as to control the adjusting device and increase the amount of air in the casing after the ignition is detected by the ignition detecting device.

Hereinafter, a gas combustion control method and a gas combustion apparatus according to an embodiment of the present invention will be described with reference to the drawings.

Hereinafter, the case where the gas combustion device 1 which concerns on a present Example is built in the hair dryer 3 is illustrated. As for the hair dryer 3, the tubular casing 5 has a substantially cylindrical shape, and the handle part (not shown) long in the direction orthogonal to the longitudinal direction of the casing 5 has said casing 5 mentioned above. It is provided on the side wall surface of the gas combustion device 1 is built in the casing (5).

Referring to FIG. 6, the gas combustion device 1 includes, for example, an ejector 7 for mixing LPG and air as a fuel gas to generate a mixed gas, and a mixed gas generated by the ejector 7. As an ignition device for ignition, for example, an electric load 9 and a combustor 11 for burning a mixed gas ignited by the electric load 9 are provided.

In the casing 5, a blower 15 for flowing out the combustion air heated by the combustor 11 to the outlet 13 side of the casing 5 is located behind the ejector 7 (right in FIG. 6). Built in). In addition, the blower 15 functions as an air amount adjusting device for adjusting the air amount inside the casing 5.

The blower 15 includes a direct current motor 17 mounted on the inner wall surface of the rear side of the casing 5 by a bracket 19 having an air flow path, and an axial fan for blower provided on the rotating shaft of the direct current motor 17. It consists of 21.

In addition, the rear end (right end in FIG. 6) of the casing 5 is covered with the wall surface provided with many holes for air introduction, for safety, for example, and the front end of the casing 5 (in FIG. 6). In the left end), a hot air outlet nozzle (not shown) is detachably mounted.

With reference to FIGS. 7 and 8, the combustor 11 will be described in more detail. The chamber 23 of the combustor 11 is made of a material of aluminum (die-cast), and in this embodiment, the left and right side surfaces in the longitudinal direction of the combustor 11 are generally cylindrical in cross section as shown in FIGS. 7 and 8. It is shaped body. The interior of the chamber 23 is composed of a primary combustion chamber 25 located rearward (right side in FIG. 6) and a secondary combustion chamber 27 located in front of the primary combustion chamber 25 (left side in FIG. 6). It is. The ejector 7 is attached to the gas introduction side of the rear of the primary combustion chamber 25 (right side in FIG. 6).

The ejector 7 is provided as a gas flow path from a gas supply source such as a gas tank (not shown) storing fuel gas, for example LPG, on the inlet side of the ejector body 29 having a substantially cross-sectional cylindrical shape. The nozzle 33 which injects the gas supplied through the gas supply pipe 31 is provided. The nozzle 33 has a bore hole (not shown) having a diameter of, for example, a diameter of 60 μm to 200 μm at the tip. The jetting hole is an orifice formed approximately in the center of a disc-shaped pinhole disk (not shown), and LPG is thin at the jetting hole and is discharged at high speed at a speed close to the speed of sound. The nozzle 33 has a filter (not shown) for removing impurities and dust for closing the injection hole. As the filter, for example, a sintered metal having a pinhole having a diameter of 10 to 30 µm is used. In addition, the cross-sectional shape of the ejector body may be appropriately changed.

In the ejector body 29 in front of the nozzle 33, a mixer 35 for mixing LPG with outside air (primary air) and introducing it into the combustor 11 is provided. The primary air hole 37 for sucking primary air penetrates the side wall of the filter. Therefore, the inside of the mixer 35 becomes negative pressure by the fuel gas discharged from the nozzle 33 at high speed, and primary air is sucked from the outside and mixed with the fuel gas, for example, as a front gas combustion part, for example. Is sent to the wick (39). This is called the ejector effect. Moreover, by adjusting the area of the primary air hole 37, the ratio of primary air can be adjusted. In addition, as described later, the primary air supplied to the casing 5 per unit time is also adjusted by the output of the DC motor 17 controlled by the control device 55.

In addition, the wick 39 is a gas combustion part, for example, has a cylindrical shape of a circular shape made of SUS metal mesh of 50 to 150 mesh, and is welded to the front end of the ejector body 29, for example, by welding. It is attached, and is installed in the substantially center part of the right side in FIG. 6 of the primary combustion chamber 25 of the combustor 11. As shown in FIG. In addition, the wick holder 41 as a straight restraining part is attached to the front end of the wick 39 by welding, for example. By the wick holder 41, the mixed gas called from the mixer 35 is mainly guided to the side (AR1 direction in FIG. 6), and the mixed gas of LPG and air is discharged from the mesh of the wick 39. In addition, the flame after complexation becomes substantially circular in blue.

Moreover, the above-mentioned electrorod 9 is provided in the position which approached the side surface of the front of the wick 39 inside the combustor 11. The high voltage electricity generated by the piezoelectric element for ignition (not shown) is input to the electric rod 9 by the electric wire 43, and a flame blows to the wick 39 from the tip of the electric rod 9. . The flame is ignited by the mixed gas ejected from the wick 39, and the gas is combusted.

As shown in FIG. 7, on the inner wall of the primary combustion chamber 25, a plurality of grooves 45 extending in the front-rear direction are arranged in the radial direction around the wick 39. In FIG. 7, six grooves 45 are formed.

In addition, in the rear wall (right wall in FIG. 6) of the primary combustion chamber 25, a plurality of secondary air holes 46 for supplying the outside air (secondary air) to the primary combustion chamber 25 are formed. . The plurality of secondary air holes 46 are arranged so that secondary air is supplied to the gas after ignition at positions other than the ignition portion. In addition, the ignition part is an area in which a spark occurs, and is an area around the wick 39 and an area on the electrode side 9 as shown by the dotted line in FIG. 7. In this embodiment, five secondary air holes 46 are formed.

In addition, for example, a plurality of tertiary air pipes 47 serving as tertiary air holes for supplying outside air (tertiary air) to the secondary combustion chambers 27 may include a primary combustion chamber between the grooves 45. It is provided in the wall of 25. In this embodiment, six tertiary air lines 47 are provided in total.

In addition, an opening is formed in the front end of the secondary combustion chamber 27. The opening portion forms a combustion gas outlet 49 for discharging the combustion gas combusted in the secondary combustion chamber 27.

Moreover, the some fin 5l for heat exchange is provided in the outer peripheral side of the chamber 23. As shown in FIG. The fin 51 cools the chamber 23 by releasing heat generated when the mixed gas burns in the chamber 23. Therefore, by the effect of heat exchange, heat in the chamber 23 is released, and the released heat is efficiently transferred to the air flow blown from the axial fan 21.

Moreover, the ignition detection device (ignition sensor) 53 which detects that the gas LPG in the combustor 11 ignites inside the casing 5 (or the handle part) is the combustion gas outlet of the combustor 11. It is installed in the vicinity of 49.

Moreover, inside the casing 5, ON / OFF operation | movement of the DC motor 17, and the detection signal which detected that the gas of the combustor 11 was ignited by the ignition sensor 53 were carried out. Thereby, the control device 55 which controls the rotational speed of the DC motor 17, and controls ON / OFF of the electricity supply to the electric load 9 as an ignition device is provided.

In detail, the control apparatus 55 performs different control at the time of ignition and after ignition. That is, at the time of ignition, since the amount of air in the casing 5 is reduced to make it easy to ignite, low-power operation (Low operation) which reduced the rotation speed of the DC motor 17 is performed. In addition, in the state after ignition, the control apparatus 55 rotates the DC motor 17 so as to increase the amount of air in the casing 5 in order to lower the CO concentration according to the signal detected by the ignition sensor 53. High power operation (Hi operation) with a higher number is performed. In addition, the control device 55 is electrically connected to a power supply, a DC motor 17, an electric rod 9, and an ignition sensor 53. The control device 55 also controls the opening / closing operation of an on / off valve (not shown) for supplying and stopping fuel gas.

Hereinafter, with reference to FIG. 9, the operation | movement of the control apparatus 55 and the flow from operation to stop in this embodiment are demonstrated.

First, when the driving switch (not shown) is turned on (step 1), the on signal is transmitted to the control device 55, and the control device 55 supplies electricity to the DC motor 17 of the blower 15. A command is given and air blowing is started (step 2). At the time of step 2, since the LPG is not supplied to the combustor 11 and the ignition detection signal output by the ignition sensor 53 is in an off state, the amount of air in the casing 5 from the control device 55 is reduced. A command to lower the rotation of the DC motor 17 is given, and low output operation is performed (step 3). Subsequently, an open / close valve (not shown) of the gas supply pipe 31 is opened, and LPG as fuel gas is supplied from the gas supply source to the nozzle 33 of the ejector 7 of the combustor 11 via the gas supply pipe 31. (Step 4).

When LPG is supplied to the nozzle 33 of the ejector 7 through the gas supply pipe 31, the LPG passes through the filter inside the nozzle 33 and at a speed close to the speed of sound from the injection hole as an orifice to the mixer 35. Squirt. For this reason, in the mixer 35, primary air (corresponding to the air fuel ratio) required for combustion is sucked out of the primary air hole 37 by the negative pressure generated by the ejector effect and flows into the mixer 35. (Step 5). The primary air and LPG introduced in step 5 are mixed to form a mixed gas, and blown to the front wick 39 (step 6).

In step 6, the mixer 35 automatically sucks primary air required for combustion in proportion to the increase and decrease of the LPG. However, in the casing 5, since the direct current motor 17 is operated at low output by the control device 55, the amount of air is reduced as combustion air at the time of ignition. Likewise, the amount of primary air drawn from the primary air hole 37 is also reduced. For this reason, since the gas ratio is high, the mixed gas having good ignition property is injected into the front wick 39.

In the wick 39, since the wick holder 41 is provided on the front end face, the mixed gas is mainly blown out from the SUS mesh of the side mesh.

Subsequently, a command is given from the control device 55 so that the high-voltage electricity from the piezoelectric element for ignition passes through the electric wire 43, and sparks are generated from the electric rod 9 in the combustor 11, and the wick 39. A mixed gas having good ignition property ejected from the complex is ignited (step 7).

The timing of ignition, that is, the time from the end of step 6 until the execution of step 7 is appropriately changed depending on the apparatus to which the present invention is adapted. That is, considering the volume of the casing 5 and the like, the best ignition timing is determined for each device.

In addition, most of the combustion flame spreads circularly from the side of the wick 39 to the outside, and the length of the combustion flame reaches about tens of millimeters from the wick 39, and the warm air is the six inner and inner walls of the primary combustion chamber 25. It is transmitted to the secondary combustion chamber 27 in the front along the groove part 45.

Next, the on / off of the ignition signal is determined (step 8). When combustion gas is discharged from the combustion gas outlet 49 in front of the secondary combustion chamber 27, the gas of the combustor 11 ignites by the ignition sensor 53 provided in the vicinity of the combustion gas outlet 49. The burning is detected (YES in Step 8). Since the ignition detection signal is transmitted to the control device 55, high output operation is started by a command from the control device 55 (step 9), and the rotation speed of the DC motor 17 is increased, so that the casing 5 The amount of air inside is increased. If the ignition detection signal is not in the ON state in step 8, that is, if ignition has not started, the process returns to Step 7.

When the high power operation is started, as shown by the large arrow in Fig. 5, the air amount of the primary air sucked from the primary air hole 37 as the combustion air during combustion is increased. As a result, the air mixing ratio of the mixed gas of the mixer 35 is increased, the mixed gas having good combustibility is ejected from the wick 39, the combustion reaction of the gas in the primary combustion chamber 25 is promoted, and the combustion performance is improved. .

In addition, in the primary combustion chamber 25, secondary air is introduced through the five secondary air holes 46 to increase the amount of air in the casing 5 to increase combustion efficiency (step 10). As a result, combustion reaction of the gas in the primary combustion chamber 25 is accelerated | stimulated, and combustion performance improves further.

In addition, in the secondary combustion chamber 27, tertiary air is introduced through six tertiary air conduits 47 (tertiary air holes) in order to increase the amount of air in the casing 5 (step 11). . The tertiary air is efficiently lowered in the temperature of the wall portion of the primary combustion chamber 25, and warmed to a high temperature when passing through the tertiary air pipeline 47, and introduced into the secondary combustion chamber 27. As a result, combustion reaction of the gas in the secondary combustion chamber 27 is promoted, and combustion performance is improved. That is, since the gas which finished combustion in the primary combustion chamber 25 and the tertiary air which increased the amount of air at high temperature are mixed, combustion reaction becomes easy and it is easy to complete combustion. This improves combustion performance and reduces CO concentration.

On the other hand, when the operation switch is turned off (step 12), the DC motor 17 is stopped by the control device 55, and the opening / closing valve (not shown) of the gas supply pipe 31 is closed (step 13). As a result, the supply path of the LPG is cut off, and the operation of the combustion gas apparatus is stopped.

In addition, this invention is not limited to the above-mentioned embodiment, It can implement in another Example by making a suitable change. The gas combustion device of this embodiment can be used as a gas combustion device such as a hair dryer, a heat gun used for shrinking, drying, bonding, dissolving, soldering or the like of a heat shrink tube, or a gas burning device of other devices.

According to the present invention, at the time of ignition, by reducing the amount of air in the casing, the amount of air drawn in from the ejector is reduced and the amount of air in the mixed gas can be reduced to increase the gas ratio, thereby improving the ignition of the mixed gas leaving the wick. You can. After ignition, by increasing the amount of air in the casing, the combustion efficiency of the combustion gas of the combustor can be improved, the combustion performance can be improved, and the CO concentration can be reduced.

Further, according to the present invention, the ignition performance at the time of ignition can be improved by a simple method only by switching the output of the blower to high output or low output, and the combustion performance after ignition can also be improved.

Further, according to the present invention, at the time of ignition, by reducing the amount of air in the casing, the amount of air drawn in from the ejector is reduced and the amount of air in the mixed gas can be reduced, so that the gas ratio can be increased. Can be improved. After ignition, by increasing the amount of air in the casing, the combustion efficiency of the combustion gas of the combustor can be improved, the combustion performance can be improved, and the CO concentration can be reduced.

Claims (7)

A combustor for combusting fuel gas supplied from a gas supply source, an air amount adjusting device for adjusting the amount of air in a cylindrical casing incorporating the combustor, a fuel gas supplied to the combustor from the gas supply source, and air in the casing A gas combustion device comprising a wick for blowing a mixed gas into the combustion chamber, an ignition device for igniting the mixed gas blown out of the wick, a control device for controlling the air amount adjusting device and the ignition device. In the gas combustion control method of A first air amount adjusting step of controlling the air amount adjusting device to reduce the amount of air in the casing in a state before the mixed gas ejected from the wick is ignited, An ignition process of igniting the mixed gas, and A second air amount adjusting step of operating the air amount adjusting device at a higher output than in the first air amount adjusting step so as to increase the amount of air in the casing after the ignition step; Gas combustion control method comprising a. The method of claim 1, The air amount adjusting device includes a blower for flowing out the air heated by the combustor to the outlet side of the casing, and in the first air amount adjusting step, the control device reduces the air blowing amount of the blower, and the second air amount. In the adjusting step, the control device increases the air blowing amount of the blower. In the gas combustion device, A combustor for combusting fuel gas supplied from a gas source, An air amount adjusting device for adjusting an air amount in a cylindrical casing having the combustor; Wick for ejecting the mixed gas of the fuel gas supplied to the combustor from the gas supply source and the air in the casing into the combustion chamber, An ignition device for igniting the mixed gas ejected from the wick, An ignition detection device for detecting ignition of the mixed gas in the combustor, and A control device for controlling at least the air amount adjusting device and the ignition device in accordance with a signal from the ignition detection device; And The control device controls the air amount adjusting device to reduce the amount of air in the casing when the ignition detection device does not detect ignition, and increases the amount of air in the casing after ignition is detected by the ignition detection device. And a gas combustor for controlling the air amount adjusting device. The method of claim 3, The air amount adjusting device includes a blower for flowing air heated by the combustor to the outlet side of the casing. The method of claim 3, The first air intake hole for intake of outside air for mixing with the gas in a state before the ignition is detected by the ignition detection device, and the air amount adjusting device in the state after the ignition is detected by the ignition detection device. And a second intake hole and a third intake hole for intake of outside air by the gas combustion apparatus. The method of claim 3, And an on / off valve for opening and closing a supply pipe for supplying the gas to the combustor, wherein the control device controls the on / off valve. A combustor combusting a fuel gas supplied from a gas supply source, an air amount adjusting device for adjusting an amount of air in a cylindrical casing incorporating the combustor, and a fuel gas supplied from the gas supply source to the combustor and air in the casing A wick for ejecting a mixed gas into the combustion chamber, an ignition device for igniting the mixed gas ejected from the wick, an ignition detection device for detecting ignition of the mixed gas in the combustor, and supplying fuel gas into the combustor In the gas combustion control method of the gas combustion apparatus provided with the on-off valve and the control apparatus which controls the said air amount adjusting device and the said ignition device, Operating the air volume adjusting device at a low power to blow air into the casing; Supplying fuel gas by opening the on / off valve, Mixing the primary air sucked into the casing with the fuel gas to generate a mixed gas, Ejecting the mixed gas; Complexing the mixed gas by the ignition device, When the ignition detection device detects ignition, operating the air quantity adjusting device at a high output; Intake of secondary air into the casing, and Intake of tertiary air into the casing Gas combustion control method comprising a.