JPS5977218A - Emergency automatic stopping device at back-flow and back-fire of gaseous body - Google Patents

Abstract

PURPOSE:To obstruct the inflow of a back-flow and a back-fire by a method wherein an inlet valve having an elastic energizing means of which pressure is slightly lower than that of an inflow gas in normal condition and a filter made of sintered alloy having continuous gas pores is arranged between an inlet valve and an outflow port. CONSTITUTION:A nearly cylindrical shape part of an outlet valve 6, one end of which is closed, is inserted by half into an inlet port 12, and is flush with an elastic body 14 having an elastic force which is able to keep the inlet valve 6 in opening condition by a gas inflow pressure from its backside. A filter 30 made of sintered alloy having continuous gas pores is provided on the outside of a filter case 29 so as to cover a gas passage hole 32 bored on the filter case 29. When a back-flow occurs by an abnormal combustion and the like, the pressure of gas itself acts on the backside of the inlet valve 6, therefore, the gas inflow port 16 is automatically closed. Even when a part of a remaining carbon inside of a gas piping is intermixed into a device 3, the inlet valve 6 is not influenced as the result of removing by the filter 30.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic 1Q emergency stop device for backflow and backfire of gas in gas equipment piping, and more specifically, the present invention relates to an automatic stop device for backflow and flashback of gas in gas equipment piping. The present invention relates to a stop device incorporating a filter unit that removes generated carbon, attenuates the weak impact V of propagating backfire, and diffuses and extinguishes reed backfire.

Welding using gases such as acetylene, mizuya, methane, etc.
For gas equipment that performs melt cutting, thermal spraying, heating, etc., there have been a few types of safety 'A fits when abnormal combustion occurs, and one of them is the patent application No. 52-62300. As posted in the issue, gas backflow and
There is a device that works for both connoisseurs. The present invention seeks to improve this device.

Conventionally, this device functions effectively against both gas backflow and flashback, but if abnormal combustion occurs repeatedly in the gas piping, carbon particles become resistant to adhesion within the device. If even a small amount of carbon adheres to the inlet valve, which is an important component of the device, the valve will not operate smoothly, making it difficult to sufficiently prevent gas backflow, which is the function of a large-mouth valve.
There was a drawback.

In order to overcome the above-mentioned drawbacks, the present invention incorporates a filter into the pig iron 1 to remove carbon mixed into the equipment, and also incorporates a filter into the pigtail to ensure smooth operation of each valve.

There is a system in which the elastic force of each projectile is adjusted to ensure that the "l" valve always operates smoothly, and the details are shown in the drawings. To explain, Fig. 1 shows the installation of the main stop device (an overall explanatory diagram of equipment such as gas welding), and Fig. 2 shows the gas gathering arrangement 'θ equipment, and as shown, the main stop device is installed. For garlic, use a gas cylinder (
1) (1a) (1t)) Near the exit or f'i
Several pieces were installed along the way, so that when a combustion abnormality occurred in the soft pipe (2), etc., and gas backflow or backfire occurred, the gas line path was completely automatically shut off by the stop device (3). It is something.

The previous figure 153 is an explanatory internal cross-sectional view of this stopping device.The main body case is divided into an inlet side case (4) and an outlet side case (4a), and these are screwed together to form an integral body.
Part g has a threaded part (5) for connection to gas equipment piping (5a
), and a large mouth valve (6) in the internal hollow part.
The outlet valve (6a) and filter unit (7) are assembled, and the outlet side case (4) is provided with a screw hole (8) for attaching a valve retainer (described later) and the bottom of the through hole (8). !
A stopper hole 01) and a gas escape hole Qη are provided at υ.

When the gas pressure from the cylinder (1) (10 etc. is applied to the inlet side), the large mouth valve (6)
When gas backflow etc. occurs with Jfj in the open state, and gas pressure in the opposite direction, that is, gas pressure rises from the outlet side (towards), the gas inlet hole (Jfj) is opened. The one shown is a substantially cylindrical body with one end closed and half inserted into the inlet hole (2), with a gas inlet hole 01 and a rubber 0-ri 7 on the outer periphery to ensure a tight seal for the valve. An annular closing member Q3 such as a gas valve is provided in one or two stages, and the inlet valve (6) is
An elastic body (I) made of a spring or the like having elastic force enough to open the valve is placed in contact with it.The closing member 04 improves the sealing performance of the large mouth valve (6), It is provided to prevent gas leakage, and the closing member is 0.1
It is not necessarily necessary to use . Further, when two O-rings are used side by side as shown in the figure, the sealing performance of the large mouth valve (6) can be further improved compared to the case where the O-rings are connected side by side.

Normally, the outlet valve (6a) is temporarily locked by the valve locking body 01 to keep the outlet hole (12a) open, and the outlet hole (12a) is connected to the gas r, i IJ port 13. However, a flashback occurs (at 10 degrees, high gas pressure is detected at the outlet valve (6
The temporarily locked state is released when the gas flashback and backflow pressure occur during flashback. A projectile using a spring, etc. that is separate from Oa (through the action of IO, the exit hole (12
a). In the example shown, the tip is formed into a tapered shape that can be brought into close contact with the exit hole (12a), and if necessary, a closing member similar to the inlet valve (6) is attached to the tip. (15&) is attached, a plurality of gas outflow holes (16a) are bored in the rear of the tip, for example, in a circumferential manner, and a cylindrical body (17) continuous with the tip is provided.
) has an elastic body O→ such as a spring incorporated therein, and a continuous or intermittent annular recess ↑qlS aA is provided around the outer periphery.

The valve locking body (IIF) has a function for temporarily locking the above-mentioned exit valves (6), and in the embodiment, a stopper (21) that is pressed by an elastic body such as a spring is inserted. Insert the valve locking body case (22) into the outlet side case (4 screw holes (
8), the inside of the case (22) is connected to the gas escape hole αυ of the screw hole bottom (9), and the shaft part (21) of the stopper (21) is inserted through the stopper hole QO, and the shaft part (
21 is shown fitted with the four-part θ frame of the outlet valve (6). Furthermore, the illustrated one is fitted with a valve locking body case (22) in order to make the stopper (21) operate more smoothly. )
(7) Upper i Opening for K gas blow-through (23) tl
- A bushing (25) having a packing material (24) is placed on the opening (26), and the bushing (25) is pressed by an elastic body (26) such as a spring. A cap (27) is attached.

The filter unit (7) is one of the above-mentioned devices), I
B protection is to prevent carbon from sticking to the separating large mouth valve (6), to maintain its smooth operation, and to diffuse and extinguish back flame. 7) is a substantially cylindrical filter case (29) screwed into the outlet side case (4), and a gas passage is formed between the inside of the outlet valve (6) and the inside of the filter case (29). A filter (30), for example a cylindrical filter, is provided outside the filter case (29) so as to cover the gas passage hole (62) formed in the filter case (29).

In addition, filters (60) and cases (29) are available as required.
A cylindrical flow obstruction pipe (66) is installed between the gas flow hole (62) and the i+
The gas does not flow locally toward the '4 Jt'z filter (60), but is dispersed left and right by the flow 1j inertia pipe (66) and flows into the entire filter (60), so that the gas flow path is in a labyrinth state. This and the through holes of the filter (60) can prevent backflow, attenuate the shock wave at the time of flashback, and diffuse and extinguish the flashback flame.

Due to the characteristics of this product, the filter (60) used is suitable for heat resistance, 4+NJ impact resistance, sintered metal such as stainless steel, nickel, chromium, titanium, etc. can be mentioned. It is also effective to place the filter (61) inside the filter case (29) if necessary, and if a fibrous stainless steel material is used, the shock wave of the back flame that has propagated separately can be suppressed. It is effective in attenuating flames and diffusing and extinguishing backfire flames.

In this case, the gas from the cylinder (1) (1a), etc., which is the gas supply source, is supplied by the large mouth valve (6) e. Open the gas inlet hole q→, the gas flows into the device (3), and passes through the filter (
60), gas passage hole (62), gas outlet hole (1
60 Grape Street, it flows out through the outlet hole (12a) which is in the open state.

On the other hand, if backflow occurs in the abnormal combustion pipe, that is, if the gas pressure increases from the inlet side (A) to the outlet side (B), the gas will flow back in the opposite direction to the aforementioned flow. , outlet valve (6a)
Since the gas flows from the main port toward the large port valve (6), the pressure of the gas itself acts behind the large port valve (6), and as a result, the gas inlet hole α is blocked. (Even if some of the IA distillate carbon in the gas pipe gets mixed into the device Ii, (3) when it flows back into the filter (50X
31), so it does not affect the inlet valve (6).

In addition, when gas flashback occurs, there is generally a mismatch between the propagation speed of the shock wave caused by the flashback and the wave of the flashback flame, and the shock wave first precedes the exit hole that is open on the exit side (B). (1
2a) and the 01L release (16a) of the outlet valve (6a)
At the same time as the gas enters the gas escape hole 0υ, the shock wave acts on the lower surface of the stopper (21) in the valve locking body Ql, pushing up the stopper (21) and locking the outlet valve (6a).
As a result of dividing /s by l'+11-, the outlet valve (6a) strongly blocks the outlet hole (12'l) by the force of the projectile a, and the artificial valve (6) and the outlet valve (6a ) High-pressure backflow gas is sealed inside, and the can is closed while pressing the joint venture outward from the inside to cut off subsequent flashback flame.

In addition, even if there is a flame that enters the outflow hole <16a) and the shield device (3) before the stopper (21) is activated, the flame will spread and be extinguished due to the filters (50) and (61), and the flame will be absorbed into the flame. Since the trace amount of carbon contained in the carbon is removed, the large mouth valve (6) is always connected to the filter (30) (
31) prevents carbon adhesion and prevents the valve function from deteriorating. .

The stopper (21) activated due to backfire is located on the exit side (
If you push the Yamaguchi valve (6) from f3) into the device ff (3) with a shaft or the like, it will engage with the outlet valve (11) and the outlet valve (4th part 08 of 6) and can be reused. 3) can be disassembled and cleaned periodically, and can be used for a long period of time by replacing the filters (60) and (61).

Furthermore, since the projectile bodies Q→oQ are installed separately, and the projectile force suitable for the target gas pressure is selected and used, the operation of each inlet/outlet valve is quick. It is also reliable and allows gas to flow in or stop.

As described above, the present invention provides an elastic biasing means having an elastic biasing force that is slightly lower than the normal inflow gas pressure at the inflow hole of the main body case which is an internal wall and has an inflow hole and an outflow hole. The large-mouth valve is related to an emergency automatic stop device for gas backflow and flashback, which is equipped with an elastically energized inlet valve and a sintered metal filter with continuous pores between the inlet valve and the outlet hole. When the gas inflows under normal conditions, its elastic force is slightly lower than the inflow pressure, so it can be accepted smoothly, and when the inlet valve receives back pressure due to backflow or backfire, it can prevent this from inside the main body case. 1) The gas inflow hole is closed with a large valve using an applied force to prevent gas inflow and also stop the backflow at the same time. Backfire and shock waves are attenuated by the filter, and the backflow and backflow of gas is prevented. This patent features an emergency automatic stop of backfire.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is an overall explanatory diagram of equipment such as gas welding equipped with the stop device 1, ;', and Fig. 02 is a diagram of the gas collecting piping system. FIG. 3 is an explanatory internal cross-sectional view of the main stop-city device Ij.

Claims (1)

[Claims] The inflow gas pressure in the main case, which has an inflow hole and an outflow hole, is slightly lower than normal.
11 property 1 (elastic biasing with elastic biasing means having f4 force) In addition to providing an inlet valve, sintering having continuous pores (
f' An emergency automatic stop device for gas backflow and backfire, with a M filter installed between the large mouth valve and the outflow hole.