JPH07328297A - Catalytic gas-combustion type iron - Google Patents

Abstract

PURPOSE:To provide a catalytic gas-combustion type iron which is excellent in safety as an iron which takes the wrinkles out of clothes, etc., by utilizing the heat obtd. by bringing liquefied gaseous fuel into catalytic combustion. CONSTITUTION:This catalytic gas-combustion type iron includes a fuel tank 1 in which the liquefied gaseous fuel is stored, a nozzle 2 which vaporizates and ejects the liquefied gas in this fuel tank 1, a mixer 3 which mixes the gaseous fuel ejected out of the nozzle 2 and air, a combustion chamber 4 into which the gaseous fuel is supplied, a catalyst body 6 which is arranged in this combustion member, a base 11 which is heated by the combustion heat generated by this catalyst body 6, a discharge port 10 which is disposed downstream of the combustion member 4 and is disposed on the outer peripheral side face of the base 11 and a discharge passage which is formed between this discharge port and the combustion chamber 4. This discharge passage has the sectional area of the passage to make the velocity of flow of the gaseous mixture flowing the discharge port lower than the combustion rate of the gaseous mixture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention utilizes, for example, heat obtained by catalytically burning liquefied fuel gas,
The present invention relates to a catalytic combustion iron capable of straightening the wrinkles of clothes and the like.

[0002]

2. Description of the Related Art Conventionally, this type of catalytic combustion type iron is
As described in JP-A-62-144697, fuel composed of combustible liquefied gas such as propane and butane is supplied to a catalyst from a nozzle provided with a control device to cause an oxidation reaction on the surface of the catalyst for combustion. It generates heat and uses the heat of combustion.

That is, the wrinkle removal of clothes, which is the purpose of use as an iron, is carried out by bringing a base heated by the combustion heat into contact with an object to be heated such as clothes.

On the other hand, the catalyst must be maintained in a high temperature state in advance so that the temperature of the catalyst becomes equal to or higher than the intrinsic activation temperature in order to completely burn the fuel in contact with the surface. Therefore, the catalytic combustion iron also employs a method in which the catalyst is heated by a heater or flame at the time of start-up, the catalyst temperature is raised to the activation temperature or higher, and then the fuel is supplied to the catalyst to start catalytic combustion.

[0005]

However, in the above structure, when the heater is disconnected or the fuel gas is ignited by mistake, the catalyst is not heated at the time of starting and the fuel gas is supplied to the catalyst. A situation occurs in which catalytic combustion is not started. That is, in this case, originally, the fuel gas is exhausted as it is from the exhaust port for exhausting the combustion gas generated by the catalytic combustion to the outside of the catalytic combustion iron.

At this time, if a flame such as a lighter is brought close to the exhaust port, there is a problem that the exhausted combustion gas may be ignited and the flame may continue to adhere to the exhaust port.

The present invention takes these problems of the conventional catalytic combustion iron into consideration, and the catalytic combustion is not normally started.
When the mixed gas is exhausted from the exhaust port, even if the mixed gas is ignited by some kind of fire, the flame does not continue to adhere to the exhaust port or its vicinity. It is an object of the present invention to provide an excellent catalytic combustion iron.

[0008]

According to a first aspect of the present invention, a fuel supply means for mixing and mixing a fuel and air to generate and supply the mixed gas and a catalyst are held, and the mixed gas is used by using the catalyst. A catalytic chamber, and a combustion chamber having an opening on the downstream side of the catalyst on the basis of the flow of the mixed gas, and when the catalytic combustion is performed, the combustion gas generated at that time,
Further, when the catalytic combustion is not performed, an exhaust port for exhausting the mixed gas to the outside, and an exhaust passage connecting the opening and the exhaust port are provided, and the exhaust passage is connected to the exhaust passage. The flow rate of the mixed gas in the substantially continuous path from the exhaust port of the mixed gas, which is the whole or a part of the mixed gas, to the opening portion on the upstream side of the mixed gas is higher than the combustion speed of the mixed gas. A catalytic burning iron that is designed to be slow.

According to a second aspect of the present invention, the fuel supply means includes a fuel tank for storing the liquefied fuel gas as the fuel, and a nozzle for vaporizing the liquefied fuel gas in the fuel tank and ejecting the gas as the fuel gas. A catalytic combustion iron equipped with a mixing device for mixing the fuel gas ejected from the nozzle with air.

According to the third aspect of the present invention, the flow velocity of all or a part of the mixed gas flowing between the exhaust passages is lower than the burning speed of the mixed gas.
In the catalytic combustion iron, the passage sectional area of the exhaust passage is set to be larger than a predetermined area.

According to a fourth aspect of the present invention, in the mixed gas flowing between the exhaust passages, a part of the mixed gas has a flow velocity slower than a combustion speed of the mixed gas. A catalytic combustion iron in which a groove is formed from the exhaust port toward the upstream side.

According to the present invention of claim 5, a bent portion is provided in the exhaust passage near the exhaust port, and the flow velocity of the mixed gas at least near the bent portion becomes slower than the combustion speed of the mixed gas. A catalytic combustion iron in which the bent portion is formed as described above.

According to a sixth aspect of the present invention, a flame holding plate having a large number of small holes is provided in the opening, and the passage cross-sectional area of the exhaust passage near the flame holding plate has a passage on the downstream side of the exhaust passage. It is a catalytic combustion iron that is set smaller than the cross-sectional area.

According to a seventh aspect of the present invention, all or a part of the side wall of the exhaust passage is formed as a partition wall between the exhaust passage and the combustion chamber, and is held inside the catalyst along the partition wall. A communication hole that can be shielded by the existing portion is a catalytic combustion iron provided in the partition wall.

According to the present invention of claim 8, a flame holding plate having a large number of small holes is provided in the opening, and the flame holding plate extends along the wall surface of the exhaust passage to the vicinity of the communication hole. It is a catalytic combustion iron.

According to a ninth aspect of the present invention, a flame holding plate having a large number of small holes is provided in the vicinity of the opening in the exhaust passage, and the mixed gas once passes through the flame holding plate and the exhaust passage of the exhaust passage. In the catalytic combustion iron, the flame holding plate is attached at such an angle that it collides with the wall surface and then passes through the flame holding plate again, and the flame on the flame holding plate hits the catalyst that blocks the communication hole.

According to a tenth aspect of the present invention, a fuel supply means for supplying a fuel gas and air to generate a mixed gas and supplying the mixed gas and a catalyst are held, and the mixed gas is catalytically burned by using the catalyst. A combustion chamber having an opening on the downstream side of the catalyst based on the flow of the mixed gas, and the combustion gas generated at the time when the catalytic combustion is performed, or when the catalytic combustion is not performed. The mixed gas, which comprises an exhaust port for exhausting the mixed gas to the outside and an exhaust passage connecting the opening and the exhaust port, and which flows in the exhaust port or substantially in the vicinity of the exhaust port. Is a catalytic combustion iron, the flow velocity of which is not higher than the burning velocity of the mixed gas.

[0018]

According to the first aspect of the present invention, the fuel supply means mixes fuel and air to generate and supply a mixed gas, and the combustion chamber holds a catalyst, and the catalyst is used to supply the mixed gas. Catalytic combustion is performed, and an opening is provided downstream of the catalyst based on the flow of the mixed gas, and an exhaust port is provided for the combustion gas generated at the time of the catalytic combustion. Is not performed, the mixed gas is exhausted to the outside, the exhaust passage connects between the opening and the exhaust port, and all of the mixed gas flowing between the exhaust passages is exhausted. Alternatively, the flow velocity of the mixed gas in a substantially continuous path from the exhaust port of a part of the mixed gas to the opening on the upstream side thereof is set to be slower than the burning speed of the mixed gas.

With such a configuration, for example, when a flame such as a lighter is brought close to the exhaust port, the flame ignited in the mixed gas has a higher burning velocity than the mixed gas flow velocity. Propagate towards. Therefore, the flame is sucked from the exhaust port, propagates in the exhaust passage, and enters the connecting portion between the combustion chamber and the exhaust passage. The combustion chamber is heated by this flame, and the catalyst mounted in the combustion chamber is also heated. Then, when the temperature of the catalyst reaches the activation temperature, the catalytic reaction starts on the surface of the catalyst, so that the fuel gas is not supplied to the flame in the exhaust passage, and the flame in the exhaust passage disappears.

According to the third aspect of the present invention, the exhaust gas is exhausted so that the flow velocity of all or part of the mixed gas flowing between the exhaust passages is lower than the combustion speed of the mixed gas. The passage cross-sectional area of the passage is set to be larger than a predetermined area.

With such a structure, for example, when a flame such as a lighter is brought close to the exhaust port, the flame ignited in the mixed gas has a higher burning velocity than the mixed gas flow velocity, and therefore the mixed gas flows upstream in the flow direction. Propagate towards.

According to the present invention of claim 4, in the mixed gas flowing between the exhaust passages, the flow rate of a part of the mixed gas is slower than the combustion speed of the mixed gas. A groove is formed upstream from the exhaust port.

With such a structure, even if the lighter or the like ignites from the exhaust port, the flame propagates along the groove of the exhaust passage and is sucked into the exhaust passage.

According to the present invention of claim 5, a bent portion is provided in the exhaust passage near the exhaust port, and the flow velocity of the mixed gas at least near the bent portion is slower than the combustion speed of the mixed gas. The bent portion is formed in the.

With such a structure, for example, when the exhaust passage is bent at a substantially right angle in the vicinity of the exhaust port, the flow velocity of the mixed gas flowing in the exhaust passage is slow inside the bent portion and fast outside the bent portion. Therefore, even if a lighter or the like ignites from the exhaust port, the flame propagates in a region where the flow velocity is slow inside the curved portion and is sucked into the exhaust passage.

According to the present invention of claim 6, a flame holding plate having a large number of small holes is provided in the opening, and the passage cross-sectional area of the exhaust passage near the flame holding plate has a passage cutoff on the downstream side of the exhaust passage. It is set smaller than the area.

With such a configuration, for example, the flame propagating upstream in the exhaust passage adheres to the flame holding plate and burns.
Furthermore, since the exhaust passage near the flame holding plate has a smaller passage cross-sectional area than the exhaust passage downstream side, vortices are generated near the place where the passage cross-sectional area of the exhaust passage near the flame holding plate expands. , The flame attached to the flame stabilizing plate becomes very stable. For this reason, the flame once sucked does not move to the exhaust port again, and the catalyst combustion can be smoothly performed.

According to the present invention of claim 7, all or part of the side wall of the exhaust passage is formed as a partition between the exhaust passage and the combustion chamber, and is held inside the catalyst along the partition. A communication hole that can be shielded by a portion is provided in the partition wall.

With such a configuration, for example, the flame propagating upstream in the exhaust passage adheres to the opening and burns.
The catalyst in the exhaust passage thus formed can directly heat the catalyst, and the transition to catalytic combustion can be shortened.

According to the present invention of claim 8, a flame holding plate having a large number of small holes is provided in the opening, and the flame holding plate extends along the wall surface of the exhaust passage to the vicinity of the communication hole.

With such a structure, for example, the flame propagating upstream in the exhaust passage adheres to the flame holding plate and burns.
Since this flame extends downstream along the flame holding plate,
The flame reaches the communication hole reliably, and the temperature of the catalyst easily rises due to the flame in the exhaust passage.

According to the present invention of claim 9, a flame holding plate having a large number of small holes is provided in the vicinity of the opening portion in the exhaust passage, and the mixed gas once passes through the flame holding plate and the wall surface of the exhaust passage. After passing through the flame holding plate again, the flame holding plate is attached at such an angle that the flame on the flame holding plate hits the catalyst blocking the communication hole.

With such a structure, for example, in the flame propagating to the upstream side of the exhaust passage, a stagnant region of the mixed gas with vortex is generated near the flame holding plate, so that the flame holding plate is stable. Adhere to. Moreover, since the flame holding plate is attached at a predetermined angle, the attached flame can easily reach the communication hole formed in the wall surface of the exhaust passage, and the transition to catalytic combustion can be shortened.

In the tenth aspect of the present invention, the fuel supply means mixes fuel and air to generate and supply a mixed gas,
The combustion chamber holds a catalyst, catalytically burns the mixed gas using the catalyst, has an opening downstream of the catalyst based on the flow of the mixed gas, and an exhaust port is provided for the catalytic combustion. If done, the combustion gas generated at that time,
When the catalytic combustion is not performed, the mixed gas is exhausted to the outside, the exhaust passage connects the opening and the exhaust port, and the exhaust port or the exhaust port thereof is substantially connected. The flow velocity of the mixed gas flowing in the vicinity of the target is set so as not to exceed the burning velocity of the mixed gas.

With such a structure, for example, when a flame such as a lighter is brought close to the exhaust port, the flame ignited in the mixed gas is sucked from the exhaust port, and at least the flame does not come out from the exhaust port to the outside. Absent.

[0036]

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

(Embodiment 1) FIG. 1 is a sectional structural view of an embodiment according to the present invention, FIG. 2 is a front view, FIG. 3 is a sectional view taken along line B--A in FIG. 1, and FIG. FIG. 9 is a cross-sectional view taken along line A-A in the C direction. The configuration and operation of this embodiment will be described with reference to these drawings.

In FIG. 1, 1 is a liquefied gas cylinder such as propane and butane. The gas cylinder 1 is provided with a nozzle 2 having a valve (not shown) capable of adjusting the ejection amount, so that the flow rate of the fuel gas supplied from the gas cylinder 1 can be controlled. The fuel gas ejected from the nozzle 2 sucks the surrounding air by the attracting action of the gas flow, is uniformly mixed by the mixing device 3, and is supplied to the combustion chamber 4. The fuel supply means of the present invention includes the gas cylinder 1, the nozzle 2, and the mixing device 3.

The combustion chamber 4 is composed of a metal housing, and a plurality of fins 5 are arranged inside the combustion chamber 4 substantially parallel to the flow direction of the mixed gas.
Are provided to increase the surface area within the combustion chamber 4 without changing the size of the combustion chamber 4.

In the combustion chamber 4, a layered catalyst body 6 is provided along the wall surface of the combustion chamber. As the catalyst supported on the catalyst body 6, platinum group metals and metal oxides such as nickel, cobalt, iron, manganese and chromium are used, but particularly preferable are platinum group metals such as platinum, palladium and rhodium.

The fuel gas is supplied from the nozzle 2 to the mixing device 3, the air sucked by being attracted to the jetting force of the fuel gas and the fuel gas are mixed by the mixing device 3, and the mixed gas is supplied to the combustion chamber 4. An ignition device 7 is provided on the side of the combustion chamber 4 opposite to the air-fuel mixture inlet, and when the spark is blown from the plug at the tip of the ignition device 7, the mixed gas is ignited.

When the catalyst body 6 is heated by the flame formed downstream of the catalyst body 6 and the temperature of the catalyst body 6 reaches the activation temperature, catalytic combustion starts on the surface of the catalyst body 6 and the mixed gas is not supplied to the flame. , The flame goes out. After that, combustion chamber 4
The mixed gas supplied therein carries out catalytic combustion in the entire catalyst body 6 in the combustion chamber 4.

The combustion gas is discharged from the combustion chamber outlet 8 serving as the opening of the present invention through the exhaust passage 9 and the exhaust port 10 (see FIG. 2) to the atmosphere. Here, the exhaust port 10 is provided on the outer peripheral side surface of the base 11 which is heated by the combustion heat generated in the combustion chamber 4, so that the object to be heated does not block the exhaust port 10 during ironing. ing.

The temperature of the combustion chamber 4 rises above the set temperature,
The valve provided in the nozzle 2 is closed, the supply of the fuel gas is stopped, and when the temperature of the combustion chamber becomes equal to or lower than the set temperature, the valve is opened again and the supply of the fuel gas is started. The fuel gas supplied again is mixed with air in the mixing chamber 3 and flows into the combustion chamber 4. The mixed gas supplied to the combustion chamber 4 flows in the combustion chamber 4 and combustion spreads again.

Next, in the structure of such a catalytic combustion iron, if the ignition operation by the ignition device 7 becomes incomplete at the time of starting due to some kind of accident and no flame is formed in the combustion chamber 4, the catalyst temperature becomes the active temperature. The case where the unburned fuel gas is discharged from the exhaust port 10 without reaching the temperature will be described.

That is, the fuel gas ejected from the nozzle sucks the surrounding air by the attracting action of the gas flow, uniformly mixes it in the mixing device, and is supplied to the combustion chamber. The mixed gas supplied to the combustion chamber flows in the combustion chamber, passes through the exhaust passage,
It is discharged to the atmosphere through the exhaust port. When unburned mixed gas is discharged from the exhaust port due to ignition mistake or the like, flame may adhere to the exhaust port when igniting the exhaust port with a lighter or the like.

Generally, the speed at which the flame propagates in the premixed gas is called the combustion speed, and it depends on the type and concentration of the fuel, but at atmospheric pressure and room temperature, propane is 45 cm / cm.
It is known that s (fuel concentration 4.6%) and butane 44 cm / s (fuel concentration 3.5%). Therefore, if the cross-sectional area of the exhaust passage is set so that the mixed gas flow velocity has a sufficiently large value compared to this combustion speed, the flame will blow off even if the lighter is brought close to the exhaust port, and it will not adhere to the exhaust port. .

However, even if this is done, when the atmospheric temperature is lowered and the gas pressure in the fuel tank is lowered, or the amount of residual gas in the fuel tank is reduced, the amount of gas ejected from the nozzle is reduced and the mixed gas There is still a risk that the flow velocity will decrease and the phenomenon that the flame will adhere to the exhaust port will occur.

Therefore, in the present embodiment, the exhaust passage 9 is provided so that the flow velocity of the mixed gas flowing through the exhaust passage 9 has a passage cross-sectional area that is slower than the combustion speed of the mixed gas.

Taking butane as the fuel gas, the combustion rate at room temperature and atmospheric pressure is 44 cm / s (fuel concentration 3.5%). Therefore, the rated combustion amount is 500 kca
In the case of a catalytic combustion iron of 1 / h, the flow rate of the mixed gas is 137 cc / s. Therefore, in order for the mixed gas flow velocity to become smaller than the combustion velocity, 137 (c
from c / s) ÷ 44 (cm / s) = 311mm 2, it is sufficient to cross-sectional area of the exhaust passage 9 over approximately 330 mm ² in anticipation of some slack.

That is, when the cross-sectional area of the exhaust passage 9 is equal to or larger than the above area, the combustion speed becomes faster than the flow velocity of the mixed gas flowing in the exhaust passage 9.

Under such a situation, when a flame exists in the exhaust passage 9, the force of the flame to burn to the source to which the fuel gas is supplied is larger than the force of the flame to be swept away by the flow of the mixed gas. Then, a so-called flashback phenomenon occurs in which the mixed gas in the exhaust passage 9 is opposed to the flow and propagates upstream.

Therefore, even if a flame such as a lighter is brought close to the exhaust port 10, as soon as the mixed gas ejected from the exhaust port 10 is ignited, the flame is sucked from the exhaust port 10 and the inside of the exhaust passage 9 is exhausted. It propagates to the upstream side and reaches the combustion chamber outlet 8. Here, the flame adheres to the combustion chamber outlet 8. This flame heats the combustion chamber 4.

In this way, when the temperature of the combustion chamber 4 becomes high, the temperature of the catalyst body 6 placed in the combustion chamber 4 also rises. When the temperature of the catalyst body 6 becomes equal to or higher than the activation temperature of the catalyst, the mixed gas starts catalytic combustion by the catalytic reaction on the surface of the catalyst body 6.

When the catalytic combustion is started in the catalyst body 6, only the combustion gas is supplied to the combustion chamber outlet 8 and the fuel gas is not supplied. Therefore, the combustion gas is attached to the combustion chamber outlet 8. The flame goes out. As a result, the catalytic combustion iron starts as in the case where the ignition device 7 normally performs the ignition operation.

As described above, in this embodiment, the fuel tank for storing the liquefied fuel gas, the nozzle for vaporizing and ejecting the liquefied gas in the fuel tank, and the mixing device for mixing the fuel gas ejected from the nozzle with the air. A combustion chamber to which the mixed gas is supplied, a catalyst arranged in the combustion chamber, a base heated by combustion heat generated in the catalyst, and a base provided downstream of the combustion chamber and on an outer peripheral side surface of the base. The exhaust passage has an exhaust port and an exhaust passage formed between the exhaust port and the combustion chamber. The exhaust passage has a passage cross-sectional area in which the flow velocity of the mixed gas flowing through the exhaust passage is slower than the combustion velocity of the mixed gas. As a result, even if an unburned gas (mixed gas) is ignited by the flame of the lighter or the like from the exhaust port 10 due to an ignition error, as in the case of ignition in normal operation, as a result, flame combustion switches to catalytic combustion. Therefore, the safety against abnormal use is significantly improved.

(Embodiment 2) Next, another embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 3 and 4, in the exhaust passage 9, a bent portion is formed in the vicinity of the exhaust port 10 to change the flow direction of the combustion gas or the mixed gas into a substantially right angle.
The bent portion of the exhaust passage 9 includes a bent portion 12 having a small radius of curvature and a bent portion 13 having a large radius of curvature.

Since the mixed gas is flowing along the wall surface of the exhaust passage 9, the flow velocity of the mixed gas is substantially uniform in the flow direction in the straight line portion 14 of the passage shape. However, since the flow velocity in the passage in the curved portion is proportional to the radius of curvature, the flow velocity of the mixed gas has a velocity distribution in the flow direction.

From this, the flow velocity of the mixed gas becomes the slowest in the vicinity of the bent portion 12 having the smallest radius of curvature,
It becomes earliest in the vicinity of the curved portion 13 having the largest radius of curvature. Then, the mixed gas is discharged from the exhaust port 10 to the atmosphere while having this velocity distribution. Therefore, in the vicinity of the exhaust port 10, the mixed gas has the above velocity distribution. These curved portions are formed so that the flow velocity of the mixed gas in the vicinity of the curved portion 12 and the exhaust port 10 in the vicinity thereof is slower than the combustion speed of the mixed gas.

At this time, when a flame such as a lighter is brought close to the exhaust port 10, the flame ignited to the unburned gas is bent 1
2 propagates in a region of low flow velocity flowing along 2, enters the exhaust passage 9 from the exhaust port 10, propagates in the exhaust passage 9, and reaches the combustion chamber outlet 8.

Here, the passage cross-sectional area of the exhaust passage on the upstream side of the bent portion 12 is larger than a predetermined area so that the flow velocity of the mixed gas flowing therethrough becomes slower than the burning velocity of the mixed gas. The setting is basically the same as the case of the above embodiment.

In this way, the flame reaching the combustion chamber outlet 8 adheres to the combustion chamber outlet 8. This flame heats the combustion chamber 4. When the temperature of the combustion chamber 4 becomes high, the temperature of the catalyst body 6 placed in the combustion chamber 4 also rises.
When the temperature of the catalyst body 6 becomes equal to or higher than the activation temperature of the catalyst, the mixed gas burns on the surface of the catalyst body 6 by a catalytic reaction. When catalytic combustion starts in the catalyst body 6, only combustion gas is supplied to the combustion chamber outlet 8 and fuel gas is not supplied, so that the flame adhering to the combustion chamber outlet 8 disappears. To do. As a result, the catalytic combustion iron starts as in the case where the ignition device 7 normally performs the ignition operation. As a result, the safety against abnormal use is significantly improved.

(Embodiment 3) Next, still another embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a sectional view taken along line AA in the direction B in FIG.

The main difference between this embodiment and the above embodiment is that, as shown in the figure, a groove 15 is provided substantially in the center of the exhaust passage 9 from the exhaust port 10 to the vicinity of the combustion chamber outlet. is there.

That is, the flow velocity of the mixed gas flowing in the upper portion of the groove 15 becomes slower than that in other places due to the groove 15. Moreover, as shown in FIG. 6 which is a sectional view of the exhaust passage 9 taken along the line EE in FIG. 5, when the groove 15 is provided in the exhaust passage 9, the vortex 16 is generated in the groove 15 when the mixed gas flows through the exhaust passage.
Occurs. Since the vortex 16 is formed over the entire area of the groove 15, the flame propagating property is made very good.

Therefore, even if a flame such as a lighter is brought close to the exhaust port 10, the flame ignited by the unburned gas is
Immediately after propagating through the exhaust passage 9 along this groove 15,
It reaches the combustion chamber outlet 8. Here, the flame is the combustion chamber outlet 8
Adhere to. This flame heats the combustion chamber 4. Combustion chamber 4
When the temperature becomes high, the temperature of the catalyst body 6 placed in the combustion chamber 4 also rises. When the temperature of the catalyst body 6 becomes equal to or higher than the activation temperature of the catalyst, the mixed gas burns on the surface of the catalyst body 6 by a catalytic reaction. When catalytic combustion starts in the catalyst body 6, only combustion gas is supplied to the combustion chamber outlet 8 and fuel gas is not supplied, so that the flame adhering to the combustion chamber outlet 8 disappears. To do. As a result, the catalytic combustion iron starts as in the case where the ignition device 7 normally performs the ignition operation. In this way, the safety against abnormal use is significantly improved.

(Fourth Embodiment) Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 7 is a sectional view taken along the line AA in the C direction in FIG.

The main difference between this embodiment and the above embodiment is that a flame holding plate 17 having a large number of small holes is provided at the combustion chamber outlet 8 as shown in FIG. The cross-sectional area of the exhaust passage 18 is smaller than that of the exhaust passage 9 downstream thereof. The passage cross-sectional area in the exhaust passage 9 is set to be larger than a predetermined area so that the flow velocity of the mixed gas is lower than the burning velocity of the mixed gas.

With such a structure, a vortex 20 is generated at the location 19 where the passage cross sectional area suddenly expands. Even if a flame such as a lighter is brought close to the exhaust port 10, the flame that ignites the unburned gas immediately propagates through the exhaust passage 9 and reaches the combustion chamber outlet 8. Here, the flame adheres to the flame holding plate 17 provided at the combustion chamber outlet 8.

Since a large number of small holes 21 are formed in the flame holding plate 17, a large number of small vortices are generated on the surface of the flame holding plate 17 when the mixed gas flows. This vortex acts very effectively in holding the flame. Therefore, the flame firmly adheres to the flame holding plate 17. Furthermore, the vortex 20 generated in the enlarged portion 19 increases the stability of this flame. Therefore, the flame once sucked from the exhaust port 10 to the upstream side does not move to the exhaust port 10 again. As a result, the safety against abnormal use is significantly improved.

The combustion chamber 4 is heated by this flame. When the temperature of the combustion chamber 4 becomes high, the temperature of the catalyst body 6 placed in the combustion chamber 4 also rises. When the temperature of the catalyst body 6 becomes equal to or higher than the activation temperature of the catalyst, the mixed gas burns on the surface of the catalyst body 6 by a catalytic reaction. When catalytic combustion starts in the catalyst body 6, only combustion gas is supplied to the combustion chamber outlet 8.
Since the fuel gas is no longer supplied, the flame adhering to the combustion chamber outlet 8 disappears. As a result, the catalytic combustion iron starts as in the case where the ignition device 7 normally performs the ignition operation.

(Fifth Embodiment) Next, another embodiment according to the present invention will be described with reference to FIG.

FIG. 8 is a sectional view taken along line AA in the C direction in FIG. The exhaust passage 9 has a combustion chamber 4 due to its upper wall surface.
Is divided. This upper wall surface corresponds to the partition wall of the present invention.

The main difference between this embodiment and the above-mentioned embodiment is that, as shown in the figure, communication holes 22 and 23 for communicating with the combustion chamber 4 are formed in the upper wall surface of the exhaust passage 9, and these communication holes are further provided. Two
The catalyst body 6 is provided inside the combustion chamber 4 so that the catalyst bodies 2 and 23 are closed by the catalyst body 6 placed in the combustion chamber 4, and the mixed gas cannot pass through the communication holes 22 and 23.

As a result, even if a flame such as a lighter is brought close to the exhaust port 10, the flame that ignites the unburned gas immediately propagates through the exhaust passage 9 and reaches the combustion chamber outlet 8 to reach the combustion chamber outlet 8. Attach to the outlet 8.

The state at this time is shown in FIG. FIG. 9 is an enlarged view of part D in FIG.

In the present embodiment, the attached flame 24 directly heats the catalyst body 6 via the communication hole 22, or the high temperature combustion gas heats the catalyst body 6 via the communication hole 23. When the temperature of the catalyst body 6 becomes equal to or higher than the activation temperature of the catalyst, the mixed gas burns on the surface of the catalyst body 6 by a catalytic reaction. When catalytic combustion starts in the catalyst body 6, only combustion gas is supplied to the combustion chamber outlet 8 and fuel gas is not supplied, so that the flame adhering to the combustion chamber outlet 8 disappears. To do.

Therefore, conventionally, the flame heats the wall surface of the exhaust passage 9, the heat is conducted to the combustion chamber 4, and the heat of the combustion chamber 4 is conducted to the catalyst body 6, so that the temperature of the catalyst body 6 rises. However, in contrast to the fact that the catalyst temperature is raised to the activation temperature, in the present invention, the flame 24 attached to the combustion chamber outlet 8 of the catalyst body 6 directly heats the catalyst body 6, so that the flame combustion is switched to the catalyst combustion. The transition can be done in a short time.

Therefore, even if a flame such as a lighter is brought close to the exhaust port 10 and the mixed gas is ignited, the flame is sucked from the exhaust port 10, and the sucked flame is placed on the catalyst body placed in the combustion chamber 4. Since 6 is directly heated, the transition from flame combustion to catalytic combustion is smoothly performed, and the flame ignited by a lighter or the like disappears in a short time. As a result, the catalytic combustion iron starts as in the case where the ignition device 7 normally performs the ignition operation. As a result, the safety against abnormal use is significantly improved.

(Sixth Embodiment) Next, another embodiment according to the present invention will be described with reference to FIGS.

The main difference between this embodiment and the above embodiment is that a flame holding plate 25 having a large number of small holes is provided at the combustion chamber outlet 8 as shown in FIG. Exhaust passage 9
It is a point that extends along the wall surface to the vicinity of the communication hole 22.

In this way, as shown in FIG. 11, the flame 26 attached to the flame holding plate 25 on the combustion chamber outlet 8 is shown.
Extend along the flame holding plate 25. This is because when the mixed gas flows, a large number of vortices are generated on the small holes formed in the flame stabilizing plate 25, and these vortices are very effective in retaining the flame 26, so that the flame is This is because it is formed along the flame retaining plate 25. Therefore, the flame 26 surely reaches the communication hole 22, the heating of the catalyst body 6 by the flame 26 can be performed more reliably, and the transition from flame combustion to catalyst combustion can be performed in a shorter time. it can. As a result, the safety against abnormal use is significantly improved.

(Embodiment 7) Next, another embodiment of the present invention will be described with reference to FIG.

The main difference between this embodiment and the above embodiment is that the flame holding plate 27 is provided obliquely with respect to the exhaust passage 9 as shown in FIG. It is configured such that it passes through, collides with the wall surface of the exhaust passage, and passes through the flame holding plate 27 again.

In such a structure, an area where the flow is stagnant is generated in the area 29 between the flame stabilizing plate 27 and the wall surface. Therefore, the flame holding property of the flame on the flame holding plate 27 is greatly improved. Moreover, the flame 30 attached to the flame holding plate 27 becomes a flame inclined with respect to the exhaust path because the flame holding plate 27 is provided obliquely to the exhaust passage 9. Therefore, the flame 30 surely reaches the communication hole 22, the heating of the catalyst body 6 by the flame 30 can be performed more reliably, and the transition from flame combustion to catalyst combustion can be performed in a shorter time. it can. As a result, the safety against abnormal use is significantly improved.

In the above embodiment, the case where the exhaust passage is bent at a substantially right angle in the vicinity of the exhaust port has been described, but the present invention is not limited to this, and it may be formed straight, for example. Even if the flow velocity of all or a part of the mixed gas flowing between the exhaust gas passages is set to be larger than a predetermined area, the exhaust gas passage has a passage cross-sectional area larger than a predetermined area. If so, the shape or the like does not matter.

Further, at a part of the exhaust passage extending from the exhaust port to the opening on the upstream side, if the passage cross-sectional area of the exhaust passage at that portion is the above-mentioned flow velocity of the mixed gas, Even if the relationship that the combustion speed of the mixed gas becomes slower is not satisfied, the passage area is even adjusted so that the flame generated at the exhaust port substantially propagates to the opening on the upstream side. That's fine.

Further, in the above embodiment, the case where the groove 15 is provided substantially in the center of the exhaust passage 9 has been described.
Not limited to this, for example, it may of course be provided along the curved portion of the exhaust passage, and its formation location does not matter.

In the above embodiment, the exhaust passage 9 has the bent portion. However, the present invention is not limited to this. For example, the exhaust passage 9 does not have the bent portion and is substantially straight. Of course, it may be formed.

Further, in the above embodiment, when the mixed gas is ignited at the exhaust port, the flame is sucked from the exhaust port, and then the flame is used to shift to the catalytic combustion, but the present invention is not limited to this. However, for example, only from the exhaust port of the exhaust passage to a point on the way to the upstream of the exhaust passage,
The passage cross-sectional area satisfying the predetermined relationship between the flow velocity of the mixed gas and the burning velocity of the mixed gas is not adjusted, or the groove is formed only partway through the exhaust passage. But of course it's good. That is,
In this case, once the mixed gas is ignited at the exhaust port, if the flame does not even blow out from the exhaust port to the outside, the flame is held in the middle of the exhaust passage or is extinguished. It may be configured so as not to shift to catalytic combustion.

Further, in order to prevent the flow velocity of the mixed gas flowing in the exhaust port or substantially in the vicinity of the exhaust port from becoming higher than the combustion speed of the mixed gas, particularly in the vicinity of the exhaust port. Although the case of focusing on the structure of the exhaust passage has been described above, the present invention is not limited to this, for example, focusing on the fuel supply means to adjust the supply amount of the fuel gas, or focusing on the structure of the combustion chamber, Alternatively, these may be combined to satisfy the above-mentioned predetermined relationship between the flow rate of the mixed gas and the burning rate of the mixed gas.

Further, in the above-mentioned embodiment, of the mixed gas flowing between the exhaust passages, all or part of the mixed gas is mixed in a substantially continuous path from the exhaust port to the upstream opening. From the point of view that the gas flow velocity becomes slower than the combustion speed of the mixed gas, the case of focusing on the structure of the exhaust passage has been described, but the present invention is not limited to this, for example, focusing on the fuel supply means By adjusting the amount of gas supply, paying attention to the structure of the combustion chamber, or combining these, the above-mentioned predetermined relationship between the flow velocity of the mixed gas and the burning speed of the mixed gas is satisfied. You may do it.

[0096]

As is apparent from the above description,
According to the present invention of claim 1, when the mixed gas exhausted from the exhaust port is ignited, the flame does not continue to adhere to the exhaust port or the vicinity thereof, and further, the flame can start catalytic combustion. The advantage is that it is possible to provide a catalytic combustion iron that is even more safe than conventional ones.

Further, according to the present invention of claim 10, when the mixed gas exhausted from the exhaust port is ignited, the flame does not continue to adhere to the exhaust port or the vicinity thereof. It has an advantage that an excellent catalytic combustion iron can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a catalytic combustion iron according to an embodiment of the present invention.

FIG. 2 is a front view of a catalytic combustion iron according to an embodiment of the present invention.

FIG. 3 is a horizontal sectional view of a catalytic combustion iron of another embodiment according to the present invention (corresponding to a sectional view taken along line AA in the B direction in FIG. 1).

FIG. 4 is a horizontal sectional view of a catalytic combustion iron according to another embodiment of the present invention (corresponding to a sectional view taken along the line AA in the C direction of FIG. 1).

FIG. 5 is a horizontal sectional view of a catalytic combustion iron according to another embodiment of the present invention (corresponding to a sectional view taken along the line AA in the B direction in FIG. 1).

FIG. 6 is an enlarged view of a vertical cross-section part of an exhaust passage of a catalytic combustion iron according to another embodiment of the present invention (corresponding to a cross-sectional view taken along line EE of FIG. 5).

FIG. 7 is a horizontal sectional view of a catalytic combustion iron according to another embodiment of the present invention (corresponding to a sectional view taken along line AA in the C direction of FIG. 1).

FIG. 8 is a horizontal sectional view of a catalytic combustion iron according to another embodiment of the present invention (corresponding to a sectional view taken along the line AA in the C direction of FIG. 1).

9 is an enlarged view of a vertical cross-section of an exhaust passage of a catalytic combustion iron according to another embodiment of the present invention (corresponding to an enlarged view of a portion D in FIG. 1).

FIG. 10 is a horizontal sectional view of a catalytic combustion iron according to another embodiment of the present invention (corresponding to a sectional view taken along line C-A in FIG. 1).

FIG. 11 is an enlarged view of a vertical cross-section part of an exhaust passage of a catalytic combustion iron according to another embodiment of the present invention (corresponding to an enlarged view of portion D in FIG. 1).

FIG. 12 is an enlarged view of a vertical cross-section of an exhaust passage of a catalytic combustion iron according to another embodiment of the present invention (corresponding to an enlarged view of a portion D in FIG. 1).

[Explanation of symbols]

 2 Nozzle 3 Mixing device 4 Combustion chamber 6 Catalyst body 9 Exhaust passage 10 Exhaust port 11 Base 15 Groove 17, 25, 27 Flame holding plate 22, 23 Communication hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Haruo Ida 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] 1. A fuel supply unit that mixes fuel and air to generate and supply a mixed gas, and a catalyst that holds a catalyst, uses the catalyst to catalytically burn the mixed gas, and uses the flow of the mixed gas as a reference. As a combustion chamber having an opening on the downstream side of the catalyst, when the catalytic combustion is performed, the combustion gas generated at that time, or when the catalytic combustion is not performed, the mixed gas, An exhaust port for exhausting to the outside, and an exhaust passage connecting between the opening and the exhaust port, wherein the exhaust of all or a part of the mixed gas of the mixed gas flowing between the exhaust passages. A catalytic combustion iron, characterized in that the flow velocity of the mixed gas in a substantially continuous path from the mouth to the opening on the upstream side thereof is lower than the burning speed of the mixed gas. 2. The fuel supply means includes a fuel tank for storing a liquefied fuel gas as the fuel, a nozzle for vaporizing the liquefied fuel gas in the fuel tank and ejecting it as a fuel gas, and the nozzle ejected from the nozzle. The catalytic combustion iron according to claim 1, further comprising a mixing device that mixes fuel gas and air. 3. The passage cross-sectional area of the exhaust passage is predetermined so that the flow velocity of all or a part of the mixed gas flowing between the exhaust passages becomes lower than the combustion speed of the mixed gas. The catalytic combustion iron according to claim 1 or 2, wherein the area is set larger than the area. 4. The exhaust passage upstream from the exhaust port in the exhaust passage so that the flow velocity of the mixed gas of the part of the mixed gas flowing between the exhaust passages becomes lower than the combustion speed of the mixed gas. The catalytic combustion iron according to claim 1 or 2, wherein a groove is formed toward the front. 5. The bent portion is provided in the exhaust passage near the exhaust port, and the bent portion is formed so that the flow velocity of the mixed gas at least near the bent portion is slower than the combustion speed of the mixed gas. The catalytic combustion iron according to claim 1 or 2, wherein the iron is a catalytic combustion iron. 6. A flame holding plate having a large number of small holes is provided at the opening, and a passage cross sectional area of the exhaust passage near the flame holding plate is set to be smaller than a passage cross sectional area of a downstream side of the exhaust passage. The catalytic combustion iron according to claim 1 or 2, wherein 7. A communication in which all or a part of a side wall portion of the exhaust passage is formed as a partition wall between the exhaust passage and the combustion chamber and can be shielded by a portion of the catalyst which is held along the partition wall. The catalytic combustion iron according to claim 1 or 2, wherein a hole is provided in the partition wall. 8. A flame holding plate having a large number of small holes is provided at the opening, and the flame holding plate extends along the wall surface of the exhaust passage to the vicinity of the communication hole. 7. A catalytic combustion iron according to 7. 9. A flame holding plate having a large number of small holes is provided in the vicinity of the opening in the exhaust passage, and the mixed gas passes through the flame holding plate once and collides with the wall surface of the exhaust passage, and then again. The flame on the flame holding plate passes through the flame holding plate,
The catalytic combustion iron according to claim 7, wherein the flame holding plate is attached at an angle such that the flame holding plate hits a catalyst that shields the communication hole. 10. A fuel supply means for mixing and mixing fuel and air to generate and supply a mixed gas, and a catalyst, which holds a catalyst, uses the catalyst to catalytically burn the mixed gas, and uses the flow of the mixed gas as a reference. As a combustion chamber having an opening on the downstream side of the catalyst, when the catalytic combustion is performed, the combustion gas generated at that time, or when the catalytic combustion is not performed, the mixed gas, An exhaust port for exhausting to the outside and an exhaust passage connecting the opening and the exhaust port are provided, and the flow velocity of the mixed gas flowing in the exhaust port or substantially in the vicinity of the exhaust port is A catalytic combustion iron, characterized in that it is designed so as not to exceed a gas combustion speed.