JP2000028136A - Catalytic combustion device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a catalytic combustion device that uses liquefied fuel gas by catalytic combustion and uses the heat, when a temperature of a combustion unit is lower than a set temperature, a fuel control unit and an ignition unit are operated, The temperature can be controlled even at a temperature lower than the catalytic combustion temperature. SOLUTION: The supply of fuel gas to a combustion unit 21 for generating heat by oxidizing a fuel gas and air is performed by a fuel adjustment unit 2.
3, the fuel gas from the fuel control unit 23 is ignited by the ignition unit 24, and the temperature of the combustion unit 21 is detected by the temperature detection unit 25. The output signal of the temperature detection unit 25 and the output signal of the temperature setting unit 27 for setting the temperature of the combustion unit 21 to a predetermined temperature are input to the control unit 26, and the control unit 26
When the temperature of the combustion unit 21 is lower than the temperature set by the temperature setting unit 27, the fuel control unit 23 is turned on and the ignition unit 24 is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable and convenient catalytic combustion apparatus utilizing catalytic heat of liquefied fuel gas.

[0002]

2. Description of the Related Art Conventionally, this type of catalytic combustion apparatus has the structure shown in FIG. Hereinafter, the configuration will be described.

[0003] As shown in the figure, a catalyst 1 is fixed to the inner surface of a case 2 formed of a material having good thermal conductivity. An electric insulator 4 such as a ceramic is provided on the inner surface of the case 2 between the exhaust hole 3 provided in the case 2 and the catalyst 1, and the electric insulator 4 discharges a spark at the time of ignition to ignite the catalyst 1. 5 constitute a catalytic combustion section 6.

[0004] The temperature-sensitive ferrite 7 has a Curie point at which the magnetic characteristics rapidly change with temperature, is formed in a ring shape, and is fixed to the outer shell 8. The magnet 9 is provided on the inner surface of the outer shell 8 so as to face the temperature-sensitive ferrite 7 with a predetermined gap 10 interposed therebetween. The magnet 9 attracts the temperature-sensitive ferrite 7. Is fixed. The spring 12 urges the magnet 9 in a direction away from the temperature-sensitive ferrite 7.

The valve body 13 is provided with a valve port 14 facing the valve member 11 to form a valve 15 and a valve port 1.
A nozzle 16 for ejecting the vaporized fuel gas toward the catalyst 1 is provided at a position opposite to the side 4.

A temperature control section 17 for controlling the combustion temperature of the catalytic combustion section 6 is constituted by the temperature-sensitive ferrite 7, the outer shell 8, the magnet 9, the valve member 11, the spring 12, the valve body 13, and the like. 2 is press-fitted and fixed to the inner surface at one end. Reference numeral 18 denotes a fuel gas supply port. A hole 19 for taking in air is provided between the catalyst 1 and the nozzle 16.

When the fuel gas is supplied from the fuel gas supply port 18, the fuel gas passes through the center of the temperature-sensitive ferrite 7 and passes through the gap between the temperature-sensitive ferrite 7 and the magnet 9. After passing through the gap 10 with the outer shell 8, it reaches the valve port 14 and blows out from the nozzle 16. At this time, the air is drawn from the holes 19 by the flow rate of the fuel gas, and becomes a mixture of the fuel gas and the air and is supplied to the catalyst 1.

Then, a spark is generated from the discharge electrode 5 to generate a flame on the discharge electrode 5 side of the catalyst 1. The generated flame heats the catalyst 1 and starts the catalytic combustion. When the catalyst 1 starts catalytic combustion, only the exhaust gas comes to the flame, and the flame naturally disappears. The case 2 is heated by the catalytic combustion, and the heat also heats the outer shell 8.

When the outer shell 8 is heated, the outer shell 8 is heated.
When the temperature of the temperature-sensitive ferrite 7 reaches the Curie point determined by the composition, the magnet 9 cannot be attracted to the temperature-sensitive ferrite 7 and is separated from the temperature-sensitive ferrite 7 by the spring 12. , Valve member 11
Moves to the valve body 13 side to close the valve port 14. As a result, the fuel gas is no longer supplied to the catalyst 1, and the temperature decreases.

When the temperature of the temperature-sensitive ferrite 7 decreases, the magnet 9 attracts the temperature-sensitive ferrite 7 again, opens the valve port 14 and supplies fuel gas. When the fuel gas is supplied, unless the temperature of the catalyst 1 is lower than the temperature at which the catalytic combustion continues, the catalytic combustion starts again when the fuel gas is supplied. By repeating this operation, the temperature of case 2 can be kept constant.

[0011]

In such a conventional configuration, the temperature control unit 17 turns on and off the valve 15 at a temperature determined by the Curie point of the temperature-sensitive ferrite to keep the temperature of the combustion unit constant. However, it was not possible to take out the temperature detection signal and control the generation of sparks from the discharge electrode 5 constituting the ignition portion by this temperature detection signal.

[0012] Therefore, in the operation of the ignition section, when the catalyst is once ignited and the temperature is lowered after ignition of the gas at the start, the ignition is not performed, so that a constant temperature cannot be controlled. Further, in order to prevent the catalytic combustion from being interrupted, the temperature of the combustion section must be set to a temperature higher than the temperature at which catalytic combustion is possible.

The present invention solves the above-mentioned conventional problems. When the temperature of the combustion section is lower than the set temperature, the fuel control section and the ignition section are operated regardless of whether combustion is continued, It is an object of the present invention to re-ignite and reheat the catalyst so that the temperature can be controlled even at a temperature lower than the temperature at which the catalyst burns.

[0014]

According to the present invention, in order to achieve the above object, the supply of fuel gas to a combustion section that generates heat by oxidizing a fuel gas and air is controlled by a fuel control section. The ignition section ignites the fuel gas from the fuel adjustment section, and the temperature of the combustion section is detected by the temperature detection section. An output signal of the temperature detection unit and an output signal of the temperature setting unit for setting the temperature of the combustion unit to a predetermined temperature are input to the control unit, and the control unit controls the fuel adjustment unit and the ignition unit based on the input signals. The configuration is as follows. The control unit is configured to turn on the fuel control unit and turn on the ignition unit when the temperature of the combustion unit is lower than the temperature set by the temperature setting unit.

Thus, when the temperature of the combustion section is lower than the set temperature, regardless of whether combustion is continuing, the fuel control section and the ignition section are operated to re-ignite and reheat the catalyst. Temperature can be controlled even at a temperature lower than the catalytic combustion temperature.

[0016]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention is directed to a combustion section for generating heat by oxidizing a fuel gas and air, a temperature detection section for detecting the temperature of the combustion section, A fuel adjustment unit that controls supply of fuel gas to the combustion unit;
An ignition unit that ignites the fuel gas from the fuel adjustment unit, a temperature setting unit that sets the temperature of the combustion unit to a predetermined temperature,
A control unit that receives an output signal of the temperature detection unit and an output signal of the temperature setting unit and controls the fuel adjustment unit and the ignition unit, the fuel adjustment unit, the ignition unit, the control unit, and the temperature detection unit A power supply unit for supplying power to the power supply unit, wherein the control unit turns on the fuel adjustment unit and turns on the ignition unit when the temperature of the combustion unit is lower than the temperature set by the temperature setting unit. When the temperature of the combustion part is lower than the set temperature, the fuel control part and the ignition part are operated to re-ignite and heat the catalyst again, regardless of whether combustion is continuing. Temperature can be controlled even at a temperature lower than the catalytic combustion temperature.

According to a second aspect of the present invention, in the first aspect of the invention, when the temperature of the combustion section is lower than the set temperature, the control section turns on the fuel adjustment section and activates the ignition section for a predetermined time. It is configured to be turned on, so that the power consumption of the power supply unit can be suppressed and the use time of the device can be prolonged.

According to a third aspect of the present invention, in the second aspect of the present invention, the control section operates the ignition section repeatedly at predetermined intervals until the control section detects that the temperature of the combustion section increases. With this configuration, the ignition operation can be reliably performed by repeatedly operating the ignition unit, and the power consumption of the power supply unit can be suppressed to extend the use time of the device.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the control section has a counting section for counting the number of times of operation of the ignition section. And the fuel control unit is turned off, and when the ignition unit operates a predetermined number of times, it is determined that the ignition unit or the fuel control unit is abnormal and does not ignite and the temperature does not rise. By turning off the fuel adjustment unit, the supply of fuel gas is stopped to improve safety, and the ignition unit is turned off to reduce the power consumption of the power supply unit, so that the usage time of the device can be extended.

According to a fifth aspect of the present invention, in the second aspect of the present invention, the control section has a second counting section for counting the number of operations of the ignition section. When the ignition section is operated a predetermined number of times, it is determined that the ignition section or the fuel adjustment section has an abnormality and does not ignite and does not rise in temperature. By turning off and then turning on the fuel adjusting section once, it is possible to correct that the fuel adjusting section cannot be turned on / off normally due to the catch of the fuel adjusting section or the like, thereby returning to a normal state.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a main configuration of the present embodiment, and FIG. 2 is a perspective view of a catalytic combustion apparatus configured to be able to be attached to clothes or the like utilizing heat generated by catalytic combustion. It is.

As shown in FIG. 1 and FIG.
Uses a combustion catalyst (not shown) to oxidize a mixed gas of fuel gas and air sent from the fuel tank 22 to generate heat. The fuel adjustment unit 23 is configured by an electromagnetic valve or the like, and supplies or shuts off fuel gas from the fuel tank 22 to the combustion unit 21. The ignition section 24 is for generating a spark by high-voltage discharge and igniting the fuel gas.

The operation of the ignition section 24 becomes unnecessary when a flame is generated by igniting the fuel gas. The generated flame heats the combustion catalyst and thereafter shifts to catalytic combustion. Upon transition to catalytic combustion, the gas flowing into the ignition section 24 becomes exhaust gas, and the flame goes out. The temperature detection unit 25 detects the temperature of the combustion unit 21 and inputs the detection output to the control unit 26. The temperature setting section 27 sets the temperature of the combustion section 21 to a predetermined temperature.

The control section 26 compares the output of the temperature detection section 25 with the output of the temperature setting section 27, outputs the comparison output to the fuel control section 23, turns the fuel control section 23 on and off, and turns on the combustion section 21. , And the temperature of the combustion section 21 is controlled at a set temperature. The power supply unit 28 uses a battery or the like, and includes a control unit 26, an ignition unit 24, a fuel adjustment unit 23, and a temperature detection unit 2.
5. Power is supplied to the temperature setting unit 27.

The heating sheet 29 is made of a heat conductive material such as a metal foil, a metal mesh, and a heat conductive fiber having good heat conductivity, and fixes the combustion portion 21 to be heated by the combustion portion 21.

When the temperature of the combustion unit 21 is lower than the temperature set by the temperature setting unit 27, the control unit 26 turns on the fuel control unit 23 and turns on the ignition unit 24 for a predetermined time. ing.

The operation of the above configuration will be described with reference to FIG. When the temperature of the combustion unit 21 is controlled at T1, when the power is turned on at time t1, the fuel control unit 23 including an electromagnetic valve is turned on, and the fuel gas is sent to the combustion unit 21.
Further, the control unit 26 turns on the fuel adjustment unit 23 and sets the time t2
After the lapse of time, the ignition unit 24 is turned on to generate spark discharge and ignite the fuel gas. The operation of the ignition unit 24 is continued for a predetermined time t3, and the ignition of the fuel gas is reliably stopped.

When a flame is generated by the ignition of the fuel gas, the generated flame heats the combustion catalyst and the combustion section 21, and the combustion shifts to catalytic combustion. When catalytic combustion starts, exhaust gas is supplied to the flame section, and the flame goes out naturally. When the temperature of the combustion unit 21 reaches the set temperature T1 by catalytic combustion, the control unit 26 turns off the fuel adjustment unit at the set temperature t1 reaching time t4, and stops the supply of the fuel gas to the combustion unit 21.

The temperature of the combustion section 21 slightly rises due to overshoot due to the turning off of the fuel control section 23, and then starts decreasing. When the temperature of the combustion unit 21 decreases to the set temperature T1, at time t5, the control unit 26 turns on the fuel adjustment unit 23 again, turns on the fuel adjustment unit 23, and after a lapse of time t2, turns on the ignition unit 24. The operation of the ignition unit 24 is performed for a certain time t3.
The ignition operation is performed again during this period.

At this time, when the set temperature T1 of the combustion section 21 is high and catalytic combustion is possible, the fuel control section 23 is turned on when the temperature of the combustion section 21 crosses the set temperature T1 to burn the fuel gas. In some cases, combustion can be continued simply by supplying the fuel to the unit 21 and the operation of the ignition unit 24 is unnecessary, but the present invention also operates the ignition unit 24 at this time.

This makes it possible to obtain a more reliable operation with a simple configuration without having to consider the variation in the flammable temperature of the catalyst in the combustion section 21. Furthermore, even if the set temperature T1 is set lower and the temperature falls below the temperature at which catalytic combustion is possible, the temperature is raised again by igniting again, and this operation is repeated to keep the temperature of the combustion section 21 constant.

The ignition unit 24 is turned on after a lapse of a predetermined time t2 after the fuel adjustment unit 23 is turned on.
This is because spark discharge is generated after the fuel gas is supplied to No. 4 to ensure ignition. The temperature setting unit 27 is mounted in another case in FIG. 2 so that the temperature setting can be freely changed from the outside. However, the temperature setting unit 27 is mounted in the same case and simply provided with a reference voltage, and compared with this. It may be.

(Embodiment 2) The control unit 26 in FIG.
Temperature rise of the combustion part 21 (change in temperature per unit time)
The ignition unit 24 is repeatedly operated at a predetermined interval until the detection of is detected. Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described with reference to FIG. When the temperature of the combustion unit 21 falls below the set temperature T1, the control unit 26 turns on the fuel adjustment unit 23 and supplies fuel gas to the combustion unit 21. After the fuel adjustment unit 23 is turned on and the time t2 has elapsed, the ignition unit 24 is turned on for the time t3 to perform an ignition operation.

If the fuel gas is not ignited despite this ignition operation, the temperature of the combustion unit 21 continues to decrease, but after the ignition unit 24 operates and a predetermined time t6 has elapsed, the ignition unit 24 is operated again. If the ignition still does not occur, the ignition unit 24 is operated again after a predetermined time t6 has elapsed. Until it detects that the temperature of the combustion part 21 rises,
This ignition operation is repeated.

In FIG. 4, the ignition is performed in the third ignition operation, and the temperature of the combustion section 21 starts to rise. The control unit 26 detects this temperature rise, and stops the operation of the ignition unit 24. The temperature of the combustion unit 21 continues to rise, and at time t4 when the temperature reaches the set temperature T1, the fuel adjustment unit 23 is turned off, the supply of fuel gas is stopped, and combustion is stopped, and the temperature of the combustion unit 21 starts to decrease.

In this manner, the ignition operation can be reliably performed by repeatedly operating the ignition unit 24, and the temperature of the combustion unit 21 can be controlled at the set temperature T1.

(Embodiment 3) The control unit 26 in FIG.
It has a counting unit (not shown) for counting the number of operations of the ignition unit 24, and when the operation of the ignition unit 24 is counted a predetermined number of times, the operation of the fuel adjustment unit 23 and the ignition unit 24 is stopped. . Other configurations are the same as those in the first or second embodiment.

The operation of the above configuration will be described with reference to FIG. The control unit 26 turns on the fuel control unit 23 at time t1 when the temperature of the combustion unit 21 falls below the set temperature T1,
The fuel gas is supplied to the combustion unit 21. After the fuel adjustment unit 23 is turned on and the time t2 has elapsed, the ignition unit 24 is operated, and this operation is repeated until the temperature of the combustion unit 21 starts to increase.

The counting section counts this ignition operation, and when the cumulative number of times of the ignition operation has been performed a predetermined number of times (in this embodiment, N times), the temperature rise of the combustion section 21 is not detected.
Assuming that some abnormality has occurred, the fuel control unit 23 is turned off at time t7, and the operation of the ignition unit 24 is also turned off.

In this way, the fuel gas can be prevented from leaking unnecessarily, safety can be improved, and the consumption of the battery constituting the power supply unit 28 can be prevented.

(Embodiment 4) The control unit 26 in FIG.
A second counting unit (not shown) for counting the number of operations of the ignition unit 24 is provided. When the operation of the ignition unit 24 is counted a predetermined number of times, the fuel adjustment unit 23 is turned off once and turned on again. ing. Other configurations are the same as those in the first or second embodiment.

The operation of the above configuration will be described with reference to FIG. The control unit 26 turns on the fuel adjustment unit 23 at time t1 when the temperature of the combustion unit 21 falls below the set temperature T1.
After the fuel control unit 23 is turned on and the time t2 has elapsed, the ignition unit 2
4 is turned on for a time t3 to perform an ignition operation. At this time,
If the temperature rise of the combustion unit 21 cannot be detected, the predetermined time t6
After the elapse, the ignition unit 24 is operated again.

If the temperature rise of the combustion part 21 cannot be detected, the fuel control part 23 is turned off once at time t8 (time when the ignition part 24 is operated a predetermined number of times) and turned on again at time t9. This is because when the solenoid valve or the like constituting the fuel control unit 23 is caught by an obstacle such as dust, the fuel control unit 2
By turning off 3 and turning it on again, the obstacle can be removed and the operation can be returned to normal. After the fuel control unit 23 is turned on again, the ignition unit 24 is operated to re-ignite.

As described above, by temporarily turning off the fuel adjusting unit 23 and then turning it on again, it is possible to correct that the fuel adjusting unit 23 cannot be normally turned on and off due to the catch of the fuel adjusting unit 23 and to return to a normal state. .

In this embodiment, the fuel adjusting section 23 is turned on again after the second ignition operation. However, it is obvious that this number can be set to an optimum number by an actual set.

[0048]

As described above, according to the first aspect of the present invention, a combustion section that generates heat by oxidizing a fuel gas and air, and a temperature detection section that detects the temperature of the combustion section Unit, a fuel adjustment unit that controls the supply of fuel gas to the combustion unit, an ignition unit that ignites the fuel gas from the fuel adjustment unit, and a temperature setting unit that sets the temperature of the combustion unit to a predetermined temperature. A control unit that receives an output signal of the temperature detection unit and an output signal of the temperature setting unit and controls the fuel adjustment unit and the ignition unit; the fuel adjustment unit, the ignition unit, the control unit, and the temperature A power supply unit for supplying power to the detection unit,
When the temperature of the combustion unit is lower than the temperature set by the temperature setting unit, the control unit is configured to turn on the fuel adjustment unit and turn on the ignition unit. Or when the set temperature is set lower than the temperature at which catalytic combustion is performed, the temperature can be stably controlled.

According to the second aspect of the present invention, the control unit is configured to turn on the fuel control unit and turn on the ignition unit for a predetermined time when the temperature of the combustion unit is lower than the set temperature. In addition, the power consumption of the power supply unit can be suppressed and the use time of the device can be prolonged.

Further, according to the third aspect of the present invention, the control unit operates until the control unit detects that the temperature of the combustion unit increases.
Since the ignition section is configured to be repeatedly operated at predetermined intervals, the ignition section can be reliably operated by repeatedly operating the ignition section, and the power consumption of the power supply section is suppressed to extend the use time of the device. Can be.

According to the fourth aspect of the present invention, the control section has a counting section for counting the number of operations of the ignition section, and when the ignition section has been operated a predetermined number of times, the control section turns off the ignition section and the fuel adjustment section. With this configuration, useless fuel gas leakage can be reduced, safety can be improved, and the power consumption of the power supply unit can be suppressed to extend the use time of the device.

According to the fifth aspect of the present invention, the control unit has the second counting unit that counts the number of operations of the ignition unit. Since it is configured to turn off and turn on again, when it is not possible to turn on and off normally due to the catch of the fuel adjustment unit etc., it is possible to return to the normal state by performing a series of operations and changing the on / off state .

[Brief description of the drawings]

FIG. 1 is a block diagram of a catalytic combustion device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the catalytic combustion device.

FIG. 3 is an operation timing chart of the catalytic combustion device.

FIG. 4 is an operation timing chart of the catalytic combustion devices according to the second and third embodiments of the present invention.

FIG. 5 is an operation timing chart of a catalytic combustion device according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a conventional catalytic combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Combustion part 23 Fuel adjustment part 24 Ignition part 25 Temperature detection part 26 Control part 27 Temperature setting part 28 Power supply part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadashi Ando 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. 72) Inventor Atsuhito Nakai 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. FC10 GA03 HA03 3K005 AB04 AC05 BA08 DA00 GA07 GA10 GA14 HA00 3K065 TA11 TC00 TD05 TF00 TN01 TN16

Claims (5)

[Claims] 1. A combustion unit that generates heat by oxidizing a fuel gas and air to generate heat, a temperature detection unit that detects a temperature of the combustion unit, and a fuel adjustment unit that controls supply of the fuel gas to the combustion unit. An ignition unit that ignites the fuel gas from the fuel adjustment unit, a temperature setting unit that sets the temperature of the combustion unit to a predetermined temperature, an output signal of the temperature detection unit, and an output signal of the temperature setting unit. A control unit that controls the fuel adjustment unit and the ignition unit by inputting, and a power supply unit that supplies power to the fuel adjustment unit, the ignition unit, the control unit, and the temperature detection unit,
The catalytic combustion device, wherein the control unit turns on the fuel adjustment unit and turns on the ignition unit when the temperature of the combustion unit is lower than the temperature set by the temperature setting unit. 2. The catalytic combustion device according to claim 1, wherein the control unit turns on the fuel control unit and turns on the ignition unit for a predetermined time when the temperature of the combustion unit is lower than the set temperature. 3. The catalytic combustion device according to claim 2, wherein the control unit is configured to repeatedly operate the ignition unit at predetermined intervals until it detects that the temperature of the combustion unit rises. 4. The control unit has a counting unit that counts the number of operations of the ignition unit, and when the ignition unit operates a predetermined number of times,
3. The catalytic combustion device according to claim 2, wherein the ignition unit and the fuel adjustment unit are turned off. 5. The control unit according to claim 2, further comprising a second counting unit for counting the number of operations of the ignition unit, wherein when the ignition unit operates a predetermined number of times, the fuel adjustment unit is turned off once and turned on again. A catalytic combustion device as described in the above.