JPH018837Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a water seal type safety device in a flammable gas piping system.

Conventionally, when using a single flammable gas or a mixture of a flammable gas and a combustion-supporting gas, backfires and backfires accompanied by combustion that occur for some reason in gas pipes or in large-flow piping systems have been known to occur. In the event of a gas explosion, a dry safety device is installed for single bottles and the end of the piping to prevent back flame from propagating to the gas supply side, and a water-sealing type safety device is installed for piping systems with large flow rates. The installation and use of safety devices is regulated by law.

However, in the case of this water seal type safety device, as the gas is supplied, the supplied gas forms bubbles in the water seal and reaches the upper part of the safety device before being sent to the user side. The amount of gas delivered in the system is
Due to the large flow rate of m ³ /hr, bubbles are not formed uniformly, resulting in a violent boiling state, and multiple bubbles coalesce to form a single gas passage, resulting in a flashback flame when a flashback occurs. There remains a risk that the gas will propagate to the gas supply side through the gas passageway caused by the coalescence of bubbles in the water seal and ignite. Especially in the case of mixed gas, the combustion temperature is high and the explosion pressure is extremely high. There remains the problem that the back flame is likely to propagate to the gas supply side through the gas passage in the water seal and ignite.

The present invention was developed to solve the problems of conventional water-sealed safety devices, and prevents backflow of flammable gas and backfire from propagating to the gas supply side and causing ignition. Another object of the present invention is to ensure that flashback can be extinguished even when the combustion temperature is high and the explosion pressure is large, such as in the case of a mixed gas of combustible gas and combustion-supporting gas.

In order to achieve this purpose, in the present invention, the upper opening of the bottomed cylindrical main body is shielded with a destruction plate, and a gas delivery pipe is installed at the upper part of the main body, and a gas introduction pipe is installed at the lower part of the main body. A partition plate with a gas passage hole is disposed across the upper part of the main body through which the opening of the gas introduction pipe inside the main body is exposed, and the main body is divided into a bottom gas chamber at the lower part and an upper compartment chamber at the upper part. At the same time, the tightening unit has a large-diameter disc-shaped holding plate on the upper part of the ventilation cylinder, which is cylindrical with an opening at the bottom and has gas ventilation holes in the side wall. A cylindrical flame-extinguishing filter is fixed to the periphery to connect the inside of the ventilation cylinder and the bottom gas chamber of the main body, and has countless fine holes uniformly.The upper end opening is partitioned into a disc-shaped presser plate at the top of the unit. With the lower end openings in contact with the plates and closed, fit them into the ventilation tube at intervals, and fill liquid such as water up to above the top surface of the tightening unit to prevent water from flowing between the lower part of the main body and the lower part of the gas introduction pipe. The gist is that a seal was formed.

Hereinafter, details of the water seal type safety device for a flammable gas piping system of the present invention will be further explained based on the attached drawings.

The water seal type safety device installed in the piping system of the gas supply line has a bottomed cylindrical main body 1 that opens upward, and a gas introduction pipe 2 is connected to the lower part of the main body 1, and a gas delivery pipe 3 is connected to the upper part of the main body 1. A water seal portion 4 is formed by filling a liquid for preventing backfire propagation, such as water or antifreeze, over the lower part of the gas inlet pipe 2 and above the upper surface of the tightening unit, which will be described later. is shielded by a destruction plate 5 made of a thin metal plate, and a check valve 6 is provided at an appropriate position on the gas introduction pipe 2. The basic structure is such that the check valve 6 is linked with a lever 7 which is activated at the same time as the breakage occurs.

A cylindrical anti-flame filter 8 is attached to the water seal portion 4 of the main body 1.
As shown in the figure, a partition plate 9 having a gas passage hole 10 formed therein is arranged transversely at the lower part of the main body 1 and above the opening of the gas introduction pipe 2. The inside of the main body 1 is divided into a bottom gas chamber 11 in the lower part and an upper compartment in the upper part, and a cylindrical flame-extinguishing filter 8 is provided on the upper surface of the partition plate 9 to surround the gas passage hole 10 to store the gas. The flame-extinguishing filter 8 is erected at a distance from the periphery of the through hole 10 with its axis vertical, and the upper end opening of the flame-extinguishing filter 8 is placed in the upper part of a cylindrical ventilation cylinder 11 which has a gas passage hole 13 in the side wall and is open at the bottom. The tightening unit 12, which is provided with a disk-shaped press plate of the same diameter, is brought into contact with the disk-shaped press plate and closed, and the lower part of the vent cylinder below the disk-shaped press plate of the tightening unit 12 is connected to the periphery of the gas vent 10. By screwing and fixing, the inside of the ventilation cylinder and the bottom gas chamber 11 of the main body 1 are connected to each other, and at the same time, the lower end opening of the flame-extinguishing filter 8 is brought into contact with the partition plate 9 and closed, thereby opening the gas ventilation hole 13. The flame-extinguishing filter 8 is fitted into the vent hole bored in the side wall at intervals, and then installed inside the water seal part 4.

In addition, the feed gas fed from the gas introduction pipe 2 is made into bubbles in the bottom gas chamber 11 in the water seal part 4, and the cylinder wall of the flame-extinguishing filter 8 is bubbled through the gas vents 10 and 13. Let it pass through this anti-inflammatory filter 8.
As the bubbles pass through, they are further made into finer bubbles and released uniformly from the entire outer circumferential surface of the flame-extinguishing filter 8, and then floated onto the water seal section 4, passing through the inside of the main body 1, and being sent in the direction of the gas delivery pipe 3. It is something to do.

Here, the quenching filter 8 not only has to exhibit a reliable quenching effect, but also needs to make the gas bubbles into fine bubbles and release them uniformly from the entire outer peripheral surface of the quenching filter 8. It has a structure having countless micropores uniformly, and the material is sintered metal, ceramics, synthetic resin, etc.

A large number of cylindrical flame-extinguishing filters 8 may be provided, and they may be installed not only within the water seal section 4 but also at appropriate locations within the main body 1, gas introduction pipe 2, and gas delivery pipe 3 above the water seal section 4. It is possible.

According to the water seal type safety device for a flammable gas piping system of the present invention as described above, the cylindrical flame-extinguishing filter 8 having countless micropores uniformly is attached to the main body 1.
By installing it in the water seal part 4 inside the pipe, if a flashback or gas explosion accident occurs at the end of the pipe, etc., it can be used especially when the combustion temperature is high and the gas is a mixture of flammable gas and combustible gas. Even when the explosion pressure is high, the flame extinguishing effect of the flame extinguishing filter 8 and the water sealing and cooling action of the water seal section 4 can reliably prevent back flame from propagating to the gas supply side and causing a fire.

Furthermore, due to the action of the countless uniform micropores of the flame-extinguishing filter 8, the supplied gas can be uniformly released from the entire outer circumferential surface of the flame-extinguishing filter 8 in the form of fine bubbles. The gas forms into large diameter bubbles in the sealing part 4, and when the bubbles coalesce, as in the case of continuous release from several openings provided in the gas introduction pipe 2, a single gas is formed in the water sealing part. Since a passage is formed, there is no fear that the flashback flame will ignite through this gas passage to the gas supply side in the event of flashback or explosion.

Furthermore, even when pressure is applied to the water seal part 4 of the main body 1 due to backfire pressure and the flame-extinguishing filter 8 is exposed, the flame backflow passes through the fine holes of the flame-extinguishing filter 8 and is removed from the flame-extinguishing filter 8. It is diffused and attenuated when it reaches the gap between the ventilation cylinders, is attenuated again when it reaches the inside of the ventilation cylinder from the gas ventilation hole 13 of the ventilation cylinder, and further from the inside of the ventilation cylinder to the bottom gas chamber 11 at the bottom of the large volume main body 1. Since it is greatly diffused and attenuated when it enters, the three-time attenuation effect can reliably prevent the influence of flashback from reaching the gas supply side.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of the water seal type safety device for a flammable gas piping system according to the present invention. 1: Main body, 2: Gas introduction pipe, 3: Gas delivery pipe,
4: Water seal section, 5: Destruction plate, 6: Check valve, 7: Lever, 8: Anti-flame filter, 9: Partition plate, 10: Gas vent, 11: Bottom gas chamber, 12: Tightening unit, 13 : Gas vent.

Claims (1)

[Scope of utility model registration request] The upper opening of the main body 1 in the shape of a cylinder with a bottom and an upward opening is shielded by a destruction plate 5, and a gas delivery pipe 3 is installed in the upper part of the main body 1.
A gas introduction pipe 2 is connected to the lower part of the main body 1, and a partition plate 9 having a gas passage hole 10 is arranged across the upper part of the main body 1 where the opening of the gas introduction pipe 2 is exposed. The inside of the main body 1 is divided into a lower bottom gas chamber 11 and an upper upper compartment, and a large-diameter disk-shaped vent cylinder is provided at the top of the ventilation cylinder, which is cylindrical with an open bottom and has a gas passage hole 13 in the side wall. The lower part of the venting cylinder of the tightening unit 12 provided with the presser plate is fixed to the periphery of the gas venting hole 10 of the partition plate 9 to communicate and connect the inside of the venting cylinder and the bottom gas chamber 11 of the main body 1. A cylindrical flame-extinguishing filter 8 having a uniform shape of A water seal portion 4 is fitted and filled with a liquid such as water up to a level above the upper surface of the tightening unit 12 and extends between the lower part of the main body 1 and the lower part of the gas introduction pipe 2.
A water seal type safety device for a flammable gas piping system, characterized by forming a combustible gas piping system.