JPS6237612A - Continuous discharge control device for liquefied gas - Google Patents

Abstract

PURPOSE:To prevent discharge of raw gas from a burner by installing two diaphragms, large and small, in such a constitution that two diaphragms are installed at a vaporizing chamber and a gas inflow port respectively via pistons placed between the tow diaphragms and swelling of the large diaphragm produces downward motion of the small diaphragm. CONSTITUTION:When gas fills up a vaporizing chamber 6, a large diaphragm 8 installed facing the vaporizing chamber 6 is swelled out by gas pressure into an inner port 7 of a main-body 1; therefore, the upper piston 9 and the lower piston 10 are pushed downward and a projected end part 10' of the lower piston 10 pushes the small diaphragm 14 with force and deforms it, and then the small diaphragm 14 closes a gas inflow hole 15 and this closed condition is maintained so far as pressure in the vaporizing chamber 6 is not reduced. When a burner starts to be used as a blowtorch after ignition, pressure in the vaporizing chamber 6 as well as a small vapor chamber 16 is reduced and then gas in a gas bomb B flows into the small vapor chamber 16 after pushing up the small diaphragm 14, and proper amount of gas is continuously supplied to the vaporizing chamber 6.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a gas discharge amount control device for a blowtorch using a small gas cylinder.

<Prior art> A blowtorch that uses gas from a small gas cylinder filled with liquefied gas such as butane as fuel is 1, for example, Design Registration No. 5038.
No. 11 and No. 524909, it is widely used for various tasks in place of blowtorches that conventionally used gasoline as fuel. These blowtorches use gas in a small gas cylinder filled with liquefied petroleum gas (raw gas) as fuel.
The valve of the gas cylinder is suppressed and opened by a part of the blowtorch device into which the gas cylinder is inserted, vaporized gas is introduced into the device, and the amount of ejection from the torch nozzle is controlled using the needle valve installed in the device. An example of such a conventional product, in which the size of the flame is generally adjusted, is shown in a sectional view in FIG. 6. In FIG. 6, the main body I of the blowtorch is fixed by a clamp K. It is equipped with a lid C that can be opened and closed, and a cylinder B is housed inside the main body. The valve V of the cylinder B is always maintained in an open state by the suppression of the lid C, and the gas discharged from the cylinder B passes through the passage P and reaches the needle valve N, and the gas controlled by the needle valve N is Passage Q/vaporization chamber R
・It reaches burner S through filter F and can be used as a blowtorch by igniting it.

The example shown in Fig. 6 is designed to promote the vaporization of liquefied gas by making the capacity of the vaporization chamber R particularly large. The situation is almost the same as this example.

<Problems to be Solved by the Invention> The problem with blowtorches that use liquid fuel as a fuel source is how to quickly and reliably vaporize the liquid fuel inside the device, and how to vaporize it quickly and reliably depending on the temperature of the outside air. The point is to minimize the impact and maintain a stable supply of flame to the burner, and for this purpose, in conventional blowtorches that use gasoline, the area near the vaporization chamber is sufficiently preheated before using the torch. In addition, in the case of using liquefied butane gas, measures such as making the vaporization chamber as large as possible to promote vaporization of the raw gas are adopted.

Problems are unlikely to occur when the blowtorch is used horizontally, but in various operations it is unavoidable that the cylinder is tilted or, in the worst case, used upside down. In such a case, a large amount of unvaporized fuel is forcefully supplied from the cylinder into the device, and may be ejected from the nozzle in the form of liquefied gas without being vaporized inside the device. Such a situation not only significantly impedes the workability of the site where the blowtorch is used, but also is dangerous for the workers.

At present, gasoline-powered blowtorches are gradually being withdrawn from the market due to their lack of ease of operation1.
The present applicant invented the present invention in order to eliminate such problems in blowtorches that use liquefied gas as a fuel source.

At the same time, considering the fact that with conventional blowtorches, the amount of flame ejected is adjusted by rotating a needle valve, so that the amount of flame necessary for the work is continued regardless of whether the flame is used during the work, the fuel In order to be economical, the flame can be changed to a large or small flame without operating a needle valve, the pilot flame is maintained when the flame is not in use, and it can be instantly switched to a large flame when it is needed. I was able to maintain this for as long as needed.

In addition, due to the relationship between the gas and the atmospheric temperature outside the pump,
Since the pressure changes slightly, it must be taken into consideration that the amount of gas emitted will vary depending on the area where it is used and the time of day it is used. In the past, there was no equipment available that could handle delicate speed regulation to deal with such situations, so solutions were taken based on user experience, such as warming the cylinder in front of the car. In this case, we have made it easy to make such adjustments.

Measures to Solve Problems> When raw gas is spewed out from the burner, it means that raw gas continues to be supplied to the vaporization chamber, etc. in an amount that exceeds the vaporization processing capacity of the appliance, as mentioned above. Therefore, if such a situation occurs, the problem can be solved by cutting off the supply of liquefied gas from the cylinder to the appliance.

In addition, in order to instantly change the size of the flame, instead of rotating the needle valve, you can use a lever to rotate a cam attached to it to open the gas inlet that is blocked or almost blocked. .

To shut off the gas, prepare two diaphragms, one large and one small, and place the large diaphragm in the vaporization chamber and the small diaphragm at the gas inlet from the cylinder to the appliance, and install a piston between the two diaphragms. , so that the expansion of the large diaphragm produces a downward movement of the small diaphragm, and if there is no outflow of gas from the vaporization chamber to the burner while facing the same gas pressure, or if there is an excessive When a significant pressure increase occurs (when raw gas is supplied), the large diaphragm with a large pressure-receiving area lowers the small diaphragm via the piston, blocking the flow of gas from the cylinder to the appliance. I'll do what I do. As mentioned above, determining how much pressure is generated in the vaporization chamber to cut off the inflow of gas depends on the temperature of the outside air.
For example, in the case of butane gas, the internal pressure of the cylinder is Q, 1Kg/cm2 at a temperature of 3℃, and 1.8 at a temperature of 30℃.
Kg/cm2, and there is a large difference, and the pressure changes between these values as the temperature changes. From this point, if 1
If the length of the piston is set so that the small diaphragm descends at Kg7cm2 and blocks the gas inlet, the pressure will be 0.
．． In the case of 1Kg/cm2, the shutoff operation is not performed,
Further, when the pressure is 1.8 kg/cm2, there is a problem in that the inlet continues to be blocked or maintained in a nearly blocked state regardless of the situation.

In order to eliminate this inconvenience, if the length of the piston installed between the large diaphragm and the small diaphragm is changed, the expansion can be selectively adjusted according to the degree of expansion of the large diaphragm. A structure can be obtained that transmits the power to the small diaphragm.

Finally, in order to instantly switch between large and small flames, adjust the needle valve so that the flame is ejected at a large level, and then adjust the length of the piston so that the gas inlet is almost blocked. Adjust to the extent that As a result, while the needle valve is in a state where it can eject a large flame, the small diaphragm ensures a state in which the flow of gas into the interior of the appliance is restricted, and the burner is ignited and used as a pilot light.

In order to instantly switch this pilot flame to a large flame that can be used, a suitable cam means having an external lever is used to prevent the small diaphragm located close to the opening cutoff from becoming an obstacle to the inflow of gas. Just push the piston up so that it disappears.

According to the present invention, it is possible to obtain a broadchie that is compatible with the influence of outside air temperature and can maintain a stable flame, and the appliance can be arbitrarily adjusted to these temperatures, and it is possible to continuously discharge raw gas. It is possible to obtain a device which can completely prevent the above and can instantly switch between the pilot flame and the flame to be used.

<Embodiment> FIGS. 1 to 5 are cross-sectional views of an embodiment according to the present invention, and the structure thereof will be explained according to FIGS. 1 and 2.
2 is a support body on which a nozzle 3 and a needle valve 4 are installed, and 5 is a rotating knob fixed to the needle valve 4. A vaporization chamber 6 is bored in the support body 2, and a lumen 7 is formed in the main body 1, and the vaporization chamber 6 and the lumen 7 are airtightly partitioned by a large diaphragm 8. Below the large diaphragm 8, an upper piston 9 and a lower piston 10 are inserted into the inner cavity 7 so as to be able to slide vertically relative to each other. A large cam 11 is inserted through it. One end of the large cam 11 projects outside the main body 1 from a long hole 12 bored in the main body 1, and a turning knob 13 is fixed to the projecting end. The upper piston 9 has its upper surface facing the large diaphragm 8 and its lower surface facing the lower piston 1.
0, and a part thereof is installed facing the large cam 11. A projecting end 10' is protruded from the lower end of the lower piston 10, and is fixed by a fixing ring 14' installed at the bottom of the inner cavity 7, facing the gas inlet 15 of the main body l. It is in contact with the diaphragm 14. The gas inlet 15 opens facing the small diaphragm 14, forms a small air chamber 16 at the opening, and is connected to the vaporization chamber 6 of the support 2 via a horizontal flow path 17 and a vertical flow path 18. There is. Below the gas inlet 15, the main body 1
A valve seat 19 having a flow path 20 is installed inside the valve seat 19 under the action of a spring 21, and when the valve seat 19 is pressed, the valve V of the gas pump B opens. Further, the tip of the needle valve 4 passing through the vaporization chamber 6 enters a gas discharge hole 22 formed in one wall of the vaporization chamber 6 to close it. Reference numeral 23 in FIG. 2 is a small cam, which is inserted through the main body 1 and its inner cavity 7, and is located below the lower piston 10. When the lower piston 10 is in its lowest position, the small cam 23 is inserted. When rotated, the lower piston 1
In order to avoid complication of the drawing, the lever of the small cam 23, which should protrude outside the main body l in order to rotate the small cam 23, is not shown. 1 and 2 are cross-sectional views showing the structure of the present invention, and the large and small diaphragms 8 and 14 and the upper and lower pistons 9 and 10 are shown in neutral positions, and gas is supplied from the gas pump B. This shows a state in which no gas is supplied and the needle valve 4 closes the gas discharge port 22.

<Description of the operation of the embodiment> (Figs. 3 to 5) When the device of the present invention in the state shown in Figs. 1 and 2 is connected to the gas pump B, the valve V is pressed by the valve seat 19. When the gas cylinder B is opened, the gas in the gas cylinder B passes through the flow path 20 of the valve seat 19, reaches the small air chamber 16 from the gas inlet 15 of the main body 1, and further passes through the horizontal flow path 17 and the vertical flow path 18 to the vaporization chamber 6. As a result, the vaporizing chamber 6 whose gas discharge port 22 is closed by the needle valve 4 is filled with gas.

When the vaporization chamber 6 is filled with gas, the large diaphragm 8 installed facing the vaporization chamber 6 expands due to the pressure of the gas.
To bulge into the lumen 7 of the body 1.

The upper piston 9 and the lower piston 10 are pushed down from the position shown in FIG. 2 and descend as shown in FIG.
The projecting end 10' suppresses the small diaphragm 14 to deform it, and the small diaphragm 14 closes the gas inlet 15, and this closed state is maintained as long as the pressure in the vaporization chamber 6 does not decrease.

Of course, the small diaphragm 14 also receives the same gas pressure as the large diaphragm 8, but this state is maintained because there is a large difference in the pressure receiving areas of the two diaphragms.

When the user turns the needle valve 4 and opens the gas discharge port 22, the gas inside the vaporization chamber 6 is supplied to the nozzle 3, and a burner (not shown) attached in series with the nozzle 3 is ignited. As a result, when it starts to be used as a blowtorch, the pressure in the vaporization chamber 6 and the pressure in the small air chamber 16 decrease, and the gas in the gas cylinder B pushes up the small diaphragm 14 and flows into the small air chamber 16, continuously An appropriate amount of gas continues to be supplied into the vaporization chamber 6.

To make the large diaphragm 8 push down the upper piston 9 using the pressure inside the vaporization chamber 6, as shown in FIG. 3, the knob 13 is rotated from the state shown in FIG. 3, the upper piston 9 is separated from the lower piston 10, thereby separating the upper and lower pistons 9 and 10.
If the total length of is increased, the upper piston 9 will be closer to the large diaphragm 8, so both pistons 9 and 10 will start descending with less expansion of the large diaphragm 8, and as a result, with less gas pressure. The flow of gas from the gas pump B to the main body 1 is blocked.

Next, to explain how to change the flame size, the needle valve 4 is adjusted so that the amount of gas necessary for the work can be supplied to the nozzle 3, and the large cam 11 is adjusted to control the small diaphragm at the current gas pressure. 14 is adjusted to close the gas inlet 15 to the extent that some gas inflow is allowed. The arrangement of the parts in this state is such that the small diaphragm 14 is slightly elevated from the position shown in FIG. In this way, a small amount of gas (enough to maintain this type of flame) will always be supplied from the gas pump B to the vaporization chamber 6, so that it can be extinguished if the flame is not used in the middle of the work. In order to instantly obtain a large flame, the small cam 23 is rotated from a state approximately equivalent to that shown in FIG. 4, and the lower piston 10 is mechanically moved as shown in FIG. And forcibly push L, small diaphragm 1
4 to release the almost blocked state of the gas inlet 15, the gas in the gas cylinder B will rapidly flow into the main body 1 and be supplied to the nozzle 3 without affecting the large diaphragm 8. The flame, which was about the size of a pilot flame until now, is rapidly grown to a size that can be used for work, and as long as the lower piston 10, large cam 11, and upper piston 9 are pushed up by the small cam 23, the size of the flame increases. is maintained.

In the drawings, the large cam 11 and the small cam 23 are shown positioned at right angles to each other, but this is not necessarily a necessary condition, as long as each cam can operate properly. The installation position, angle, etc. are arbitrary.

In addition, although no particular explanation was given regarding the seals applied to various parts in the figure, the gas in the gas cylinder B flows through the nozzle 3.
Until then, each part is properly sealed to prevent leakage to the outside of the main body.

The large diaphragm 8 in FIG. 1 is integrally provided with a sealing portion 8', which is used to more easily seal between the main body 1 and the support 2 in the vertical flow path 18. However, if the punch is designed, the large diaphragm 8 and the seal portion 8° may be separate.

Each diaphragm 8-14 may be made of any material as long as it is a soft material that can be easily deformed by the pressure of the gas used in the present invention, is not corroded by liquefied gas, and can withstand rapid temperature changes. It is.

<Effects of the Invention> As described above, according to the present invention, it is possible to appropriately adjust the temperature of the outside air, which has been the biggest drawback of blowtorches that use liquefied petroleum gas, and it is possible to quickly change the size of the flame with one simple action. Therefore, it is possible to obtain an economical blowtorch in which the influence of outside temperature is minimized.

[Brief explanation of the drawing]

Fig. 1 is an internal explanatory cross-sectional view of the device of the present invention, Fig. 2 is a longitudinal sectional view of the central part of Fig. 1, Fig. 3 is an enlarged sectional view of the main part showing changes in the arrangement of parts in Fig. 2, and Fig. 4 The figure is a drawing similar to Fig. 2 with the gas inlet blocked, Fig. 5 is a drawing similar to Fig. 2 with a small cam in use, and Fig. 6 is a partial cross-sectional view of the conventional product. be. L...Main body, 2.Support, 3.Nozzle, 4 fist/needle valve, 5. Fighting knob, 6. Vaporization chamber, 7 fist lumen, 8. Medium thick diaphragm, 9. Upper piston. , 10・
・Lower piston, 10'... Projecting end, 11... Large cam, 12... Long hole, 13 Fist/knob, 14... Small diaphragm, 14°... Fixed ring, 15... Gas inlet, 1
6...Small air chamber, 17...Horizontal flow path, 18...Vertical flow path,
19.Valve seat, 20.Fist flow path, 21Φ.Spring, 2
2 fists, gas outlet, 23... small cam.

Claims (1)

[Claims] A support body 2 equipped with a nozzle 3, a needle valve 4, and a vaporization chamber 6 is fixed on a main body 1 having a lumen 7, the vaporization chamber 6 and the lumen 7 are located concentrically, and a large diaphragm 8 is placed between them. A small air chamber 16 is formed at the lower end of the inner cavity 7 with a
A gas inlet 15 from the gas cylinder B is installed inside the inner cavity, and a small diaphragm 14 is fixed to the bottom of the inner cavity 7 by a fixing ring 14' facing the gas inlet 15. At the same time, an upper piston 9 and a lower piston 10 which can be slid up and down are installed inside the lower piston 1, and a large cam 11 is installed between the two to open a gap between them.
0, one end of the large cam 11 protrudes to the outside through the long hole 12 of the main body 1, and a knob 13 is attached to the end of the large cam 11.
In addition, the small air chamber 16 and the vaporization chamber 6 are connected to the horizontal flow path 1.
7 and vertical flow path 18, and further connects the main body 1 and the inner cavity 7.
A continuous discharge control device for liquefied gas comprising a small cam 23 which is rotatable from the outside and is installed below the lower piston 10 through the cam.