JPH053855Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid inflow prevention structure for a cassette cylinder type hand torch.

[Prior art] In a hand torch, a gas cylinder is attached to the base end, a nozzle is provided at the tip of the main body, a control valve is provided in the gas flow path from the gas cylinder to the nozzle, and the nozzle body and combustion tube are surrounded by an outer cylinder. Then, the vaporized gas from the nozzle and the air from the primary air hole of the crater body are mixed and ignited within the combustion cylinder, and the combustion exhaust gas is ejected as hot air from the opening at the tip of the outer cylinder.

[Problem that the invention aims to solve] With this hand torch, when the entire torch is tilted or laid down during use, the liquefied gas flows out of the gas cylinder in a liquid state and flows into the gas flow path on the torch body side. , it may cause red flame combustion and misfire. Especially in the case of a new gas cylinder, even a slight tilt will cause the liquid to flow out, so it cannot be moved for 1 to 2 minutes after ignition.

As a countermeasure for this, there are gas cylinders that have a liquid leakage prevention structure added to them, but such gas cylinders are not popular and are expensive. This will increase the cost.

Therefore, an object of the present invention is to provide a liquid inflow prevention type hand torch having a structure that allows liquefied gas to completely vaporize in the gas flow path before reaching the nozzle even if it flows out of the gas cylinder in a liquid state. That's true.

[Means for Solving the Problems] The gist of the liquid inflow prevention type hand torch of the present invention will be explained below using reference numerals in the attached drawings.
A nozzle 3 and a nozzle body 4 are provided at the distal end of the main body 1 to which the gas cylinder 2 is mounted at the base end, and a control valve 5 is provided in the gas flow path 37 from the gas cylinder 2 to the nozzle 3.
Fitting the outer cylinder 7 of the combustion cylinder 6 connected to the crater body 4,
Gas from nozzle 3 and primary air hole 10 of crater body 4
The mixture is ignited in the combustion tube 6, and the combustion exhaust gas is turned into hot air through the opening 46 at the tip of the outer tube 7.
In the hand torch, the porous resistor 4 allows liquefied gas to penetrate into the gas flow path 37 of the main body 1.
7 is inserted, and the liquefied gas impregnated into the porous resistor 47 is vaporized by heat transfer from the crater body 4.

[Operation] When the control valve 5 is opened and the fuel gas from the gas cylinder 2 is injected from the nozzle 3, air is sucked in from the primary air hole 10 of the crater body 4, and a mixed gas of the air and gas is supplied to the combustion tube 6. be done. When the mixed gas is ignited by an appropriate means and combustion is sustained, the combustion exhaust gas ejected from the tip opening 13 of the combustion tube 6 is transferred to the two gases sucked in from the base opening 14 of the inner tube 7. The heated air is then mixed with air and blown out as hot air from the opening 46 at the tip of the outer cylinder 7, and is used for bending work of synthetic resin pipes.

When the liquefied gas flows out of the gas cylinder 2 in a liquid state due to tilting the hand torch, the liquefied gas flows through the porous resistor 4 in the gas flow path 37.
7, it encounters resistance and delays the time for liquid outflow. The liquefied gas impregnated into the porous resistor 47 is transferred to the nozzle 3 and the main body 1 by heat transfer from the crater body 4.
is heated and vaporized while passing through the porous resistor 47. Therefore, the liquefied gas is prevented from flowing into the nozzle 3 side in a liquid state, and only completely vaporized gas is supplied to the nozzle 3.

[Embodiment] In the illustrated embodiment, a sintered filter, ceramic wool, or the like is used as the porous resistor 47, and when liquid flows out from the gas cylinder 2, the liquefied gas is passed through gas-permeable holes or the like. By sequentially penetrating into the voids, resistance is provided to the movement of the liquefied gas, and the outflow of the liquid is delayed.

A gas passage 37 accommodating the porous resistor 47 is provided in a horizontally elongated proximal portion 48 of the main body 1 that is arranged parallel to the nozzle body 4 and the combustion tube 6. The resistor 47 has a length and cross-sectional area sufficient to delay the movement of the liquefied gas and vaporize it during that time. The porous resistor filling port 49 of the gas flow path 47 is closed by a sealing plug 50 .

In this embodiment, a heat insulating cylinder 22 is fitted to the outside of the outer cylinder 7, a cover cylinder 8 is fitted to the heat insulating cylinder 22, and the cover cylinder 8 also surrounds the crater body 3.
The cover cylinder 8 made of punched metal has a large number of ventilation holes 9 along the entire length and circumference of the side wall. The base end of the cover cylinder 8 is fixed to the pair of left and right intermediate arms 31 of the main body 1 by a taptite 30.
The middle part of the cover tube 8 has a tap-tight 3 in the radial direction.
2 to the proximal protrusion 33 of the main body 1.

The tips of the outer tube 7 and the heat insulating tube 22 are fixed to the tip of the cover tube 8 by a radial taptite 23, and the base ends of the outer tube 7 and the heat insulating tube 22 are secured to the tip of the cover tube 8 by the taptite 32. It is fixed to the middle part of the cylinder 8. A disk-shaped blow-through prevention plate 12 connects the base end opening 14 of the outer cylinder 7 and the primary air hole 10 of the crater body 4.
The annular space between the cover cylinder 8 and the combustion cylinder 6 is closed. The short cylindrical flange portion 38 of the blow-through prevention plate 12 is fitted and fixed to the base end portion of the combustion tube 6.

The vaporized gas control valve 5 is composed of a needle valve,
An operating knob 15 is attached to the outer end of the valve body. The mixed gas is ignited by a spark plug 17 connected to a piezoelectric device 16. A damper cylinder 18 that opens and closes the primary air hole 10 is fitted on the outside of the crater body 4, and the damper cylinder 18 is connected to the ignition button 19 of the piezoelectric device 16 by a wire 19 passing through the base end opening 34 of the cover cylinder 8. is connected to.

When the ignition button 20 is pressed, the damper cylinder 18 moves forward to reduce the amount of air sucked in, so that the mixed gas is reliably ignited. After ignition, press the ignition button 20
When the pressure is released, the damper cylinder 18 is moved back by the return spring 21, and the primary air hole 10 is fully opened.
A necessary and sufficient amount of combustion air is supplied.

In this embodiment, the nozzle 3 and the nozzle body 4 are constructed as separate bodies, but they can also be manufactured as one piece, and the combustion tube 6 can also be integrated with the nozzle body. A hot air blow-off arm member 25 disposed behind the synthetic resin pipe is attached to the tip of the cover tube 8 as necessary.

An adapter 26 is provided at the base end of the main body 1 to fit into the gas outlet of the gas cylinder 2.
When the adapter 26 is pressed into place, the gas cylinder 2
The valve is opened and vaporized gas is supplied to the gas flow path 37. A pair of left and right hook members 27 are attached to the overhanging portions 35 on both sides of the base end of the main body 1 by pivots 36.
The upper end flange 2 of the gas cylinder 2 is biased by the spring 28.
9, thereby connecting the main body 1 to the gas cylinder 2. A support leg 39 is rotatably attached to the main body 1.

[Effects of the invention] As described above, in the liquid outflow prevention type hand torch of the invention, the porous resistor 47 through which liquefied gas permeates is inserted into the gas flow path 37 of the main body 1, and the porous resistor 47 is impregnated. Since the liquefied gas is vaporized by heat transfer from the crater body 4, there is no risk of red flame combustion and misfire unlike in conventional torches. No matter how the positional relationship between the torch body 1 and the gas cylinder 2 changes, a normal combustion state can be maintained accurately, so there are no restrictions on the working posture when using the hand torch.

In addition, the liquid inflow prevention structure is built into the torch main body 1, and a popular gas cylinder without a liquid outflow prevention structure can be used as the consumable gas cylinder 2. This reduces the overall work using a hand torch. Cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a left side view of a liquid inflow prevention type hand torch according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. FIG. 4 is a bottom view of the main body of the hand torch, and FIG. 5 is a vertical sectional view of the main part of the hand torch. 1... Body, 2... Gas cylinder, 3... Nozzle, 4... Crater body, 5... Control valve, 6... Combustion tube, 7... Outer tube, 8... Cover tube, 9... Vent hole , 10...Primary air hole, 11...Opening at the tip of the cover tube, 12...Blow-through prevention plate, 13...Opening at the tip of the combustion tube, 14...Opening at the base end of the outer tube, 1
5... Operation knob, 16... Piezoelectric device, 17... Spark plug, 18... Damper tube, 19... Interlocking wire, 20... Ignition button, 21... Return spring, 22... Heat insulation tube, 23...Tap tight, 2
4... Inner flange of heat insulating tube, 25... Arm member for hot air stop, 26... Connecting adapter, 27...
Hook member, 28...Biasing spring, 29...Connection flange, 30...Tap tight, 31...Intermediate arm portion of main body, 32...Tap tight, 33...
Base end protrusion of main body, 34...Proximal end opening of cover tube, 35... Projection of main body, 36... Pivot of hook member, 37... Gas flow path, 38... Short cylindrical collar part, 39...Support leg body, 40...Proximal end of gas cylinder, 41...Shaft hole for support leg body, 42...Axis rod portion of support leg body, 43...Stop protrusion for storage, 4
4... Stop protrusion for protrusion, 45... Base rod portion of support leg, 46... Opening at tip of outer cylinder, 47...
Porous resistor, 48... Proximal horizontally elongated portion of main body, 49
...Porous resistor filling port, 50...Sealing plug.

Claims (1)

[Scope of utility model registration request] A nozzle 3 and a crater body 4 are provided at the tip of the main body 1 to which a gas cylinder 2 is attached to the base end, and a control valve 5 is provided in a gas flow path 37 from the gas cylinder 2 to the nozzle 3, and is connected to the crater body 4. The outer cylinder 7 of the combustion tube 6 is fitted, the gas from the nozzle 3 and the air from the primary air hole 10 of the crater body 4 are mixed, ignited in the combustion tube 6, and the combustion exhaust gas is converted into hot air to the outer tube 7. In this hand torch, a porous resistor 47 through which liquefied gas permeates is inserted into the gas flow path 37 of the main body 1, and the liquefied gas impregnated in the porous resistor 47 is transmitted from the crater body 4. A hand torch that prevents liquid from flowing in and vaporizes with heat.