JPS5977216A - Emergency automatic stopping device at back-flow and back-fire of gaseous body - Google Patents

Abstract

PURPOSE:To make the whole system compact and attenuate the gas flow velocity at a gas back-flow by a method wherein a cylindrical filter made of sintered alloy having continuous gas pores is arranged at the direction through which the gas passes a wall body of the filter. CONSTITUTION:A filter unit 7 is detachably attached by screwing an outlet side case 4a into a nearly cylindrical filter case 29, a gas passage is formed of the inner parts of an outlet valve 6a and the filter case 29, a cylindrical filter 30 having continuous gas pores is provided on the outside of the filter case 29 so as to cover a gas passage hole 32 bored on the filter case 29. The filter 30 is preferably to be made of sintered alloy having heat resistance and shock resistance. When a gas back-fire occurs, a shock wave initially pushes up a stopper 21 inside of a valve retaining body 19, then the retaining condition of the outlet valve 6a is released, therefore, an outlet hole 12a is closed tightly. Even a flame enters into a device 3 before the outlet hole 12a is closed, the flame is diffused and extinguishes due to the existence of the filters 30, 31, while a very small amount of carbon contained in the flame is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency automatic stop device for backflow and flashback of gas in gas equipment piping, and more specifically, the present invention relates to an emergency automatic stop device for backflow and flashback of gas in gas equipment piping, and more specifically, the stop device includes:
It incorporates a filter unit that removes carbon that enters or is generated within the device when a flashback occurs, attenuates the shock wave of the propagating flashback, and diffuses and extinguishes the flashback. This invention relates to a stopping device with an l-axis characteristic.

Welding using gases such as acetylene, hydrogen, methane, etc.
Various types of safety devices have existed in the past as safety devices in case of abnormal combustion occurring in gas equipment that performs bath 1411r, thermal spraying, heating, etc., and one of them is the patent application No. 52 + 623. As posted in No. C10, there are devices that function for both gas backflow and backfire. The present invention relates to improvements to said device.

Conventionally, this device functions effectively against both gas backflow and flashback, but if abnormal combustion occurs in the gas piping, carbon particles will come close to the device.
If even a small amount of carbon comes close to the large mouth valve, which is the second component of the device, the valve will not operate smoothly, and the large mouth valve must sufficiently prevent the backflow of gas. It had the disadvantage that it turned into a sticky paste.

In order to solve the above-mentioned drawbacks, the present invention incorporates a filter for removing carbon mixed into the device, and also incorporates a filter for removing carbon mixed into the device.
In order to ensure smooth operation of the valve, the elastic force of each projectile was adjusted to ensure smooth operation of the inlet and outlet valves at all times, and the details are shown in the drawings. - To explain based on an example, Fig. 1 is an overall explanatory diagram of equipment such as gas welding equipped with this stop device, and Fig. 2 is a diagram of the gas 4.1 unit piping '+! This is an iZL diagram, and as shown in the figure, the main stop device bar (3) is connected to the gas cylinder 0) (1a)
(1b) When a combustion abnormality occurs near the outlet or in the piping, the detonator 2), etc. causes backflow or backfire of the gas, the stop device (3) The yarn path is completely automatically shut off.

Fig. 3 is an explanatory internal cross-sectional view of this stopping device, in which 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. is provided with a threaded part (5) (5a) for connection with gas equipment piping, and a large mouth valve (6) and an outlet valve (6) are provided in the hollow part inside.
a) The outlet 11111 case (4, a) is equipped with a threaded hole (8) for attaching a valve locking body (to be described later) and the bottom of the threaded hole (8). (
9) is provided with a stopper hole (IO and a gas escape hole (b).

The artificial valve (6) opens the gas inlet hole Q0 when the gas pressure from the cylinder (1) (10, etc. , that is, when the gas pressure increases from the outlet side CB), the gas inflow hole 0 is closed, and the example shown is a substantially cylindrical one with one end closed. It is inserted halfway into the inlet hole (a), and a ring-shaped closing member a frame such as a rubber O-ring is provided in one or two stages on the outer periphery of the gas inlet hole 0 (to ensure sealing of the entire valve). Population dialect (6
) is arranged in contact with an elastic body α→ made of a spring or the like having an elastic force sufficient to open the inlet valve (6) under the gas inflow pressure. Note that the closing member ah is provided to improve the sealing performance of the large mouth valve (6) and to prevent gas leakage, and it is not necessary to necessarily use the closing member 0.1. Furthermore, 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 when two O-rings are used.

Normally, the outlet valve (6a) is temporarily locked by the valve locking member to keep the outlet hole (12a) open, and gas can freely pass through the outlet hole (12a), but vice versa. When high gas pressure acts near the outlet valve (6a) as in the case of a fire, the temporarily locked state is released, and the outlet valve (6a) counteracts the gas flashback and backflow pressure that occurs in the event of a flashback. The outlet hole (12a) is closed by the action of a spring or the like separate from the bullet body α→. The tip i':!A is formed into a tapered shape that can be brought into close contact with the outlet hole (12a), and if necessary, a closing member (13a) similar to the inlet valve (6) is attached to the tip. ) is attached, and a plurality of gas outflow holes (16a) are bored at the rear of the tip, for example, in a circumferential manner,
The cylindrical body portion continuous with the tip portion has an elastic body such as a spring incorporated therein, and continuous or intermittent annular recesses are provided around the outer periphery.

The valve holding body (l!!l) has a function of temporarily locking the above-mentioned exit valve (6). 21) into the outlet side case (four screw holes (8)), and insert the inside of the case (22) into the bottom of the screw hole (9).
Install it in electrical continuity with the gas escape hole (11) of the stopper (
The shaft IIs (21a) of 21) is inserted through the hole αQ of the k stopper, and the shaft portion (21a) is inserted into the fourth part θ of the exit valve (6a).
It is shown fitted with a barrel.

Furthermore, in the illustrated example, an opening (26) for gas blow-through is formed in the upper part of the valve locking body case (22) in order to make the operation of the stopper (21) smoother.
3) Bushing (25) with packing material (24) on top
is mounted, and a cap (27) with an opening (28) which is pressed by a resilient body (26) such as a spring is attached.

The filter unit (7) protects the inside of the device described above, in particular, prevents the artificial valve (6) from adhering to carbon, maintains its smooth operation, and diffuses and extinguishes back flame. Yes, if detailed below, the unit (7)
A substantially cylindrical filter case (29) is screwed into the outlet side case (4), and a gas passage is formed between the inside of the outlet valve (6a) and the inside of the filter case (29). A cylindrical filter having continuous pores is provided externally so as to cover the gas passage hole (62) drilled at (';B).

Also, if necessary, filter (60) and case (29)
If a cylindrical flow obstruction pipe (66) is loosely fitted between the and , the flow obstruction tube (66) spreads the flow to the left and right and spreads through the shift filter (
30) Since there is only one flow throughout the gas flow path, the gas flow path becomes a maze, and this and the through holes of the filter (30) prevent backflow, attenuate the shock wave at the time of flashback, and diffuse and extinguish the flashback flame. I can stir it. Due to the characteristics of this device, the filter (60) used should be made of a heat-resistant, impact-resistant sintered alloy, or a sintered metal such as stainless steel, nickel, chromium, titanium, etc. Can be mentioned. The filter (61) may also be installed inside the filter case (29) if necessary.
) is effective, and the use of fibrous stainless steel material is particularly effective in attenuating the shock wave of the propagating backfire, and also in diffusing and extinguishing the backfire.

The structure of this stop device (3) is as described above, and the gas from the cylinder (1) (1a) etc. as a gas supply source is
Under normal conditions, the population valve (6) is pushed with the gas pressure to open the gas inlet θ→, and the gas flows into the device (3) and filters through the filter (60).
) through the wall of the gas passage hole (62) and the gas outlet hole (
16 and flows out through the open outlet hole (12a).

On the other hand, if backflow occurs due to abnormal combustion, etc. -2, that is, the gas pressure is 1t11 on the outlet side (B) from the inlet OIO (A).
<This is because the gas flows backwards in the opposite direction to the aforementioned flow and flows from the outlet valve (6) toward the population valve (6), so the pressure of the gas itself acts behind the large mouth valve (6). , automatically closes the gas inlet hole H. Also, if the gas
Even if some of the residual carbon in the gas piping gets mixed into the device (3) when it flows back into the filter (50) (31
), so it does not affect the population valve (6).

In addition, when gas flashback occurs, there is generally a difference in the propagation speed of the shock wave caused by the flashback and the flashback flame, and the shock wave first precedes the exit hole, which is in an open state from the exit side (B). (1
2a), the shock wave passes through the outlet valve (the gas escape hole α] at the same time as it enters the six outflow holes (16a)), and the shock wave acts on the lower surface of the stopper (21) in the valve locking body a [phase]. As a result of pushing up the stopper (21) and releasing the locked state of the outlet valve (6), the outlet hole (12Q6) is strongly blocked by the force of 0.51 of the elastic body, and the large mouth valve (6) is closed. and outlet valve (
During the 6th period, the valve is sealed with reverse gas pressure, and the 6 holes are closed with each valve digit F being pressed from inside, thereby regulating the flashback flame of the temporary housing.

Please note, before the stopper (21) operates, the outflow hole (16a
Even if there is a 7E flame in the ``Yoshishi Equipment (March)'' for 1'h, the flame will not spread due to the filters (50) and (31).
As the flame is extinguished, a trace amount of x-1 is released during the fire.
Since the carbon is removed, the artificial valve (6) always goes up to the filter (30) C61) from the carbon-filled oil, and there is no possibility that the valve function will deteriorate.

Made by backfire! The Vυ stopper (21) is from the exit side (B)! If you push the outlet valve (6 pieces) into the device (3) with 1il1 etc., you can use the outlet valve (P) by engaging the 4th part of 6 (P), and this device ( In case 3), case (4) (4) can be disassembled for a short period of time (j11), and can be used for a long period of time by replacing the filter (additional X31).

In addition, since we have selected and used 5 units of ζl"t" (LvO units are provided separately and their purpose is 1), those with elasticity that can be adapted to the gas pressure are used. The inlet and outlet valves operate quickly and reliably, allowing gas to flow in or out.

As described above, the present invention is a reverse bib/backfire emergency automatic stop device for a gas body in which a sintered metal cylindrical filter having continuous pores is disposed in the direction where gas passes through the filter wall. In addition to effectively extinguishing flames during backfires, the entire device including the filter can be made compact, and gas bW is maintained even during backflow.

This allows the speed to be attenuated.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is an overall explanatory diagram of the installation of gas welding etc. with this stop device attached, Fig. 2 is a diagram showing the end of the gas collecting piping system, and Fig. 3 is It is an internal cross-sectional explanatory view of this stopping device.

Claims (1)

[Claims] 1) A gas body made of a sintered alloy with continuous pores, in which a cylindrical filter is arranged inside the main case, and the gas flow path inside the case is arranged in the direction passing through the wall of the filter. Backflow/backfire emergency emergency 11 mountain stop Bt direct.