JPH0459527B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a catalytic combustion device using catalytic combustion heat as a heat source, which is used in general households and can be easily used without a power cord.

Conventional configurations and problems Conventionally, this type of catalytic combustion device has been used for general household use in radiant heating stoves that use LPG or city gas as fuel, soldering irons that use LPG as fuel, hair curlers, and benzene as fuel. Figure 1 shows this type of catalytic combustion device applied to a hair curler.
In FIG. 1, the thermosensitive element 2 that senses the temperature of the combustion catalyst 1 expands and contracts, and the control lever 3 The valve device 6 is biased by a spring 5 to drive the valve device 6 in contact with the valve device 6. In this case, by adjusting the gap between the valve device 6 and the sealing part 7, the flow rate of the vaporized fuel gas to be released is adjusted, thereby adjusting the calorific value of catalytic combustion.

However, in this configuration, since the combustion catalyst 1 and the thermosensitive element 2 are not integrated, the flow rate is adjusted by the expansion and contraction operation of the thermosensitive element 2, and the temperature of the heat transfer body 8 containing the thermosensitive element 2 is adjusted. There was a large time lag with the control, and therefore accurate temperature control was not possible. Further, a mixed gas of vaporized fuel gas and air directly flows through the gas supply pipe 9 that holds the combustion catalyst 1 and supplies vaporized fuel gas to the combustion catalyst 1, and this mixed gas flows directly into the combustion catalyst 1. Since the gas is directly supplied to the combustion catalyst 1, it is difficult to supply a uniform amount of gas to the combustion catalyst 1. Therefore, uniform combustion of the combustion catalyst 1 cannot be performed, and as a result, abnormal combustion occurs locally. This accelerated the deterioration of the combustion catalyst 1.
In this way, in the above-mentioned conventional configuration, the non-uniform combustion of the combustion catalyst 1 and the size of the time lag between the flow rate adjustment and the temperature control of the heat transfer body work together, making it difficult to perform accurate temperature control. The problem was that it could not be done.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
It is an object of the present invention to provide a catalytic combustion device that can perform accurate temperature control by enabling uniform combustion of a combustion catalyst and reducing the time lag in temperature control.

Structure of the Invention In order to achieve the above object, the present invention has an inner pipe formed of a material with a small coefficient of thermal expansion, an inner pipe arranged at a distance on the outside of the inner pipe, and a pipe made of a material with a large coefficient of thermal expansion. A bimetal is formed by the gas supply pipe, and one end of the inner pipe and one end of the gas supply pipe are connected in the opposite direction to the inlet of the mixed gas of vaporized fuel gas and air, and the gas supply pipe The other end of the inner pipe is fixed to the outer shell, the other end of the inner pipe is brought into contact with a flow control valve, and a gas distribution pipe having a large number of holes is arranged at intervals outside the gas supply pipe. At the same time, a combustion catalyst is arranged on the outer periphery of this gas distribution pipe, and holes are provided in the inner pipe and the gas supply pipe to rectify the mixed gas and send it to the combustion catalyst. According to the above, when there is a temperature rise due to catalytic combustion, the heat is detected and the gas supply pipe and inner pipe are immediately displaced due to thermal expansion, and the flow rate control valve is controlled. Since the inner pipe and the gas supply pipe are provided with holes, the mixed gas is rectified by the holes, and there is a gap on the outside of the gas supply pipe. Since a gas distribution pipe with many holes is installed in the gas distribution pipe, the mixed gas that has passed through the holes in the gas supply pipe is sent to the combustion catalyst in an equalized state by the gas distribution pipe. As a result, uniform combustion of the combustion catalyst can be performed.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In Figures 2 and 3, 10
is a lamp wick, and one end of this lamp wick 10 is placed in a tank (not shown) for storing liquefied fuel gas, and is used to suck up liquefied fuel gas (hereinafter referred to as LPG) into a vaporizer 11. and was sucked up
LPG is vaporized in the vaporization section 11, and the vaporized fuel gas is ejected from a nozzle 15 through a passage 14 provided in a flow control valve composed of a valve A12 and a valve B13. The vaporization section 11
is constructed by press-fitting or caulking a porous material, such as sintered metal or ceramic, into the sealing tube 16. In this case, the vaporization section 11 may use a permeable membrane for vaporization.

Valve B13 constituting the flow rate adjustment valve
is on the same axis as valve A12, and is located on the same axis as valve A12.
The valve A12 is always connected to the nozzle 15 by the spring force of the coiled spring A17.
It is biased in the direction of . 18 is the valve A12
The O-ring A maintains the airtightness between the valve B13 and the valve B13, and the O-ring B19 maintains the airtightness between the valve B13 and the vaporizing section 11. Further, the valve B13 is always urged in the direction of the nozzle 15 by the spring force of the coiled spring B20, but when the switch (not shown) is turned off, Lever 21 provided in
, the valve B13 is pressed toward the vaporizer 11 side, and the valve A12 is urged in the direction of the nozzle 15 by the spring force of the coiled spring A17.
O-ring C22 provided on valve A12 is valve B
13, and as a result, the vaporization part 1
The supply of the vaporized fuel gas vaporized in step 1 to the nozzle 15 is stopped.

Reference numeral 23 denotes an inner pipe made of a material with a low coefficient of thermal expansion. This inner pipe 23 is provided coaxially with the nozzle 15, and the end on the nozzle 15 side abuts the valve A12 constituting the flow rate regulating valve. At the same time, an air suction section 2 consisting of a plurality of slits is provided.
4, and one end of the inner pipe 23 is sealed with a sealing screw 25. Reference numeral 26 denotes a gas supply pipe arranged at a distance outside the inner pipe 23, and the gas supply pipe 26 is made of a material with a large coefficient of thermal expansion, and constitutes a bimetal with the inner pipe 23. There is. Further, one end of the gas supply pipe 26 is connected to the inner pipe 23 together with the sealing screw 25 by a safety component 27 formed of an easily soluble metal.
The gas supply pipe 26 is connected to one end thereof, and the other end of the gas supply pipe 26 is fixed to the outer shell 28.

A gas distribution tube 29 and a gas distribution tube 29 are arranged at intervals by interposing a collar 30 on the outside of the gas distribution tube 26. This gas distribution tube 29 has a large number of holes 31, and has A combustion catalyst 32 is provided. An ignition heater 33 is provided in the outer shell 28 and is used to ignite the combustion catalyst 32. The ignition heater 33, together with the gas distribution pipe 29 and the combustion catalyst 32, forms a heating device.

Reference numeral 34 denotes a heat transfer cylinder disposed outside the heating device, and the heat transfer cylinder 34 is made of a material with good thermal conductivity and has an appropriately opened exhaust hole, and its end portion is connected to the outer shell 28. Fixed. Reference numeral 35 denotes a hair wrapper that is attached closely to the outer periphery of the heat transfer cylinder 34, and this hair wrapper 35 is provided with a large number of protrusions 36.

Further, the inner pipe 23 and the gas supply pipe 26 that constitute the bimetal are provided with a plurality of holes 37 and 38, respectively, for rectifying the mixed gas of vaporized fuel and air and sending it to the combustion catalyst 32.

The operation in the above configuration will be explained. In FIG. 3, when the lever 21 is slid in the direction of arrow A and a switch (not shown) is turned on, the valve B13, which had been pressed against the vaporizing section 11 by the lever 21, is moved by the spring force of the coiled spring B20. is moved to the nozzle 15 side. At this time, the tip of the valve B13 hits the contact rib 39, and the valve A12 moves in the direction of arrow A due to the spring force of the coiled spring A17 having a larger elastic modulus than the coiled spring B20, and the valve A12 moves in the direction of arrow A.
The shoulder portion 40 of the inner pipe 23 is fixed against the end surface of the inner pipe 23. Due to this operation, the O-ring 22 of the valve A12, which has been in contact with the valve B13, separates. In this state, that is, the state shown in Figure 3,
The vaporized fuel gas vaporized in the vaporization section 11 is supplied to the valve A.
It is ejected from a nozzle 15 through twelve passages 14. Then, the vaporized fuel gas ejected into the inner pipe 23 from the nozzle 15 is mixed with an appropriate amount of air sucked in from the air suction part 24 provided in the inner pipe 23, and becomes a mixed gas shown by arrow B. This mixed gas passes through the inner pipe 23, and through the plurality of holes 37 provided in the inner pipe 23, the mixed gas in the first stage is first dispersed as shown by arrow C, and then the gas supply pipe 23 The mixed gas in the second stage is dispersed through the plurality of holes 38 provided in the gas distribution pipe 29, and finally the mixed gas is uniformly ejected from the many holes 31 provided in the gas distribution pipe 29, and is then applied to the combustion catalyst 32. Supplied. In this case, the opening area of the hole 37 of the inner pipe 23 and the hole 38 of the gas supply pipe 26 may be arbitrary, but it is preferable that the opening area of the hole 37 of the inner pipe 23 and the hole 38 of the gas supply pipe 26 be larger than the total area of the hole 31 of the gas distribution pipe 29. This is preferable because the pressure loss at 26 can be small.

Further, as the gas dispersion pipe 29, it is possible to use a plate material such as punched metal or etched metal processed into a pipe shape to have a predetermined diameter, or a pipe with holes drilled. From a point of view, the former is more suitable. In this case, the material for the gas dispersion tube 29 is not limited to punched metal or etched metal, but may also be formed from porous materials such as ceramics with high porosity, sintered metal, or foamed metal. It's something that doesn't exist.

Note that it is better to attach the combustion catalyst 32 directly to the outside of the gas supply pipe 26 that constitutes the bimetal.
Although it seems to work as a bimetal sensitive to temperature rise, the temperature of the combustion catalyst 32 itself is between 700 and 800.
℃ which is too high and results in a decrease in the performance of the bimetal. Therefore, in one embodiment of the present invention, a gas dispersion pipe 2 is installed outside the gas supply pipe 26.
9 is disposed, and a combustion catalyst 32 is disposed around the outer periphery of this gas dispersion pipe 29.

As mentioned above, when the ignition heater 33 is energized while the mixed gas of vaporized fuel gas and air is evenly supplied to the combustion catalyst 32, uniform combustion of the combustion catalyst 32 will be performed, so that local Abnormal combustion is eliminated, and as a result, the temperature uniformity of the heating device and the stable catalyst performance are maintained, so that the durability of the combustion catalyst 32 itself can be improved.

Furthermore, since the inner pipe 23 and the gas supply pipe 26 that constitute the bimetal are made of materials with different coefficients of thermal expansion, when the temperature rises due to the start of combustion, the inner pipe 23 and the gas supply pipe 26 are made of a material with a larger coefficient of thermal expansion, and the other end The gas supply pipe 26 is fixed to the outer shell 28,
Inner pipe 2 made of material with a small coefficient of thermal expansion
3 is fixed in the direction of arrow D, the valve A12, which is biased by the spring force of the coiled spring A17, also moves in the same direction. At this time, since the valve B13 hits the contact rib 39 and cannot be moved, the O-ring C22 provided on the valve A12 comes into contact with the inner surface of the valve B13. As a result, the supply of the vaporized fuel gas vaporized in the vaporization section 11 to the passage 14 provided in the valve A12 is stopped. In this case, since a mixed gas of vaporized fuel gas and air is flowing in the inner pipe 23, the temperature rise due to combustion of the combustion catalyst 32 is almost eliminated by the cooling effect of the mixed gas, and as a result,
Since a state in which there is a large difference in thermal expansion with the gas supply pipe 26 is obtained, temperature-sensitive control can be performed.

In addition, as mentioned above, the vaporized fuel gas valve A1
When the supply to the passage 14 provided in 2 is stopped,
As the temperature decreases, the gas supply pipe 26 moves in the direction of arrow E in an attempt to return to its original length. Move in the same direction against a force. As a result, valve A12
is in the state shown in Figure 3, and valve A12
Since the O-ring C22 provided in the valve B13 separates from the inner surface of the valve B13, the supply of vaporized fuel gas is started again and combustion starts. Through such an operation, temperature control at a set temperature can be performed automatically and continuously.

As mentioned above, in one embodiment of the present invention,
The flow control valve made up of valve A12 and valve B13 and the temperature control mechanism (bimetal) made up of gas supply pipe 26 and inner pipe 23 are connected and integrated, so that the combustion It is possible to perform temperature control sensitively even with respect to temperature changes due to the transfer of heat between the temperature of the catalyst 32 and the heat transfer cylinder 34, thereby improving accuracy and stability. It is.

Effects of the Invention As described above, according to the present invention, an inner pipe is formed of a material with a small coefficient of thermal expansion, and an inner pipe is arranged at a distance on the outside of the inner pipe, and is made of a material with a large coefficient of thermal expansion. A bimetal is formed by the gas supply pipe and the inner pipe, and these are connected to the flow control valve, so that when there is a temperature rise due to catalytic combustion, the heat is detected and the gas supply pipe and the inner pipe immediately expand due to thermal expansion. displacement and can control the flow regulating valve, resulting in
Accurate temperature control with small time lag can be performed, and the inner pipe and gas supply pipe are provided with holes for rectifying the mixed gas of vaporized fuel gas and air and sending it to the combustion catalyst. Therefore, the mixed gas is in a rectified state due to this hole, and since a gas dispersion tube having a large number of holes is provided at intervals on the outside of the gas supply pipe, the mixed gas passes through the hole in the gas supply pipe. The mixed gas thus produced is fed to the combustion catalyst in a uniformly equalized state by the gas dispersion pipe, and as a result, excellent effects such as uniform combustion of the combustion catalyst can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a state in which a conventional catalytic combustion device is applied to a hair curler, FIG. 2 is a cross-sectional view showing a state in which a catalytic combustion device according to an embodiment of the present invention is applied to a cordless roll brush, and FIG. The figure is an enlarged sectional view of the same. 12... Valve A, 13... Valve B, 23...
... Inner pipe, 26 ... Gas supply pipe, 29 ... Gas distribution pipe, 31 ... Gas distribution pipe hole, 32 ... Combustion catalyst, 37 ... Inner pipe hole, 38 ... Gas supply pipe hole .

Claims (1)

[Claims] 1 A bimetal is constituted by an inner pipe made of a material with a small coefficient of thermal expansion and a gas supply pipe arranged at a distance on the outside of this inner pipe and made of a material with a large coefficient of thermal expansion, and One end of the inner pipe and one end of the gas supply pipe are connected in the direction opposite to the inlet of the mixed gas of vaporized fuel gas and air, and the other end of the gas supply pipe is fixed to the outer shell, and the other end of the gas supply pipe is fixed to the outer shell. The other end is brought into contact with a flow control valve, and a gas dispersion pipe having a large number of holes is arranged at intervals on the outside of the gas supply pipe, and a combustion catalyst is provided on the outer periphery of the gas dispersion pipe. A catalytic combustion device, wherein the inner pipe and the gas supply pipe are provided with holes for rectifying the mixed gas and sending it to the combustion catalyst.