CN87203375U - Dry type acetylene flashback preventer - Google Patents

Abstract

The utility model discloses a dry type acetylene flashback preventer, comprising a valve body (1), a flame-arresting tube (2), a backfire preventing valve, a filter net (6), an inlet tube (8), an outlet tube (9). The dry type acetylene flashback preventer is characterized in that the backfire preventing valve adopts a bi-directional coordinated type structure which is composed of a nonreturn valve (3) and a retaining valve (4) mutually linked. Moreover, a bar type overpressure open/close indicator linked with a retaining valve is provided. The dry type acetylene flashback preventer is quickly closed in the bi-directional mode while in the backfire of the acetylene gas, that is the paths for the acetylene gas and the explosion backfire gas can be simultaneously cut off quickly; due to the fact that the design of the multichannel sealing and the entirety preventing decomposing is also adopted, the safety of using the acetylene gas can be ensured.

Description

Dry type acetylene flashback preventer

The utility model belongs to the technical field of gas flame welder annex, and a kind of safety device that is used for the outlet of acetylene gas bottle pressure reducer promptly is provided.

A kind of important safety device when the acetylene flash-back arrestor is to use acetylene gas bottle, stipulate by " dissolved acetylence cylinder safety monitor rules " the 50th article of (8) money that Ministry of Labor and Personnel of the People's Republic of China (PRC) issues: " when using acetylene gas bottle, must install special-purpose pressure reducer, flash-back arrestor ".Also stipulate " each welding torch, cutting torch or quenching torch should be established independent post flash-back arrestor " for the 81st among the TJ31-78 " Code for design of acetylene stations ".Known dry acetylene flash-back arrestor, two-way closing function when not possessing tempering, and the air feed start mode is also quite inconvenient again after the tempering, security performance is also relatively poor, as HF-1 type dry acetylene flash-back arrestor, because backfire by-pass valve and safety valve are installed respectively, when tempering takes place, backfire by-pass valve only can cut off acetylene cylinder passage (acetylene gas air feed gas), can not close simultaneously firing tempering gas, thereby the outlet of fire-stopping pipe front end and safety valve tends to occur flare, and this does not meet the requirement of " dissolved acetylence cylinder safety monitor rules ", is unsafe yet.

The purpose of this utility model provide a kind of can be when the acetylene gas tempering two-way closing rapidly, promptly can cut off acetylene gas air feed gas and the dry acetylene flash-back arrestor that fires the passage of tempering gas simultaneously rapidly, further to guarantee operator's safety.

Dry acetylene flash-back arrestor provided by the utility model, it is characterized in that: 1, inlet tube and outlet are mutually perpendicular, and inlet tube is in the valve body centre, promptly are in the fire-stopping pipe, outlet is positioned at the valve body outside, promptly is connected as a single entity outside the fire-stopping pipe and with valve body; 2, backfire by-pass valve adopts two-way linkage formula structure, it is combined by the check valve and the check (non-return) valve of interlock each other, check valve and check (non-return) valve all are in the fire-stopping pipe, in order to help the operative employee to judge abnormal conditions, the dry flashback arrestor that the utility model provides also can be provided with a superpressure and open and close indicator, it can be positioned on the opposite side of check (non-return) valve with being equipped with link gear between the check (non-return) valve.Superpressure opens and closes indicator itself can adopt bar type structure, and after tempering phenomenon was eliminated, the effect that opens and closes indicator by superpressure can drive check (non-return) valve, and drives check valve and open automatically, so superpressure keying indicator can claim release link again.Compare with known dry acetylene flash-back arrestor, dry acetylene flash-back arrestor provided by the utility model uses promptly convenient safety again.

Its structural principle of dry acetylene flash-back arrestor provided by the utility model (hereinafter to be referred as flash-back arrestor) as shown in Figure 1.State when Fig. 1 a is the flash-back arrestor operate as normal; State when Fig. 1 b is flash-back arrestor generation tempering; Fig. 1 c is the flash-back arrestor reset condition.Among Fig. 1 a: (1) is that valve body, (2) are release link, (6) screen pack for check valve, (4) for check (non-return) valve, (5) for fire-stopping pipe, (3).As seen from Figure 1, backfire by-pass valve is combined by check valve and check (non-return) valve, check valve and check (non-return) valve are in the both sides of backfire by-pass valve valve seat respectively, adopt linkage structure between two spools, when release link is set, release link can be positioned on the rear of check (non-return) valve opposite side, also adopt linkage structure between release link and the check (non-return) valve, space between the two is the passage that acetylene gas leads to outlet, backfire by-pass valve and release link all are positioned in the fire-stopping pipe, and during operate as normal, acetylene gas is entered the mouth by flash-back arrestor, pass through screen pack successively, check valve, check (non-return) valve passes fire-stopping pipe and flows out through outlet from the space between check (non-return) valve and the release link, in case when tempering takes place, fire the tempering gas pressure intensity greater than acetylene air feed pressure, space pressurized between release link and the check (non-return) valve outwards expands, thereby check (non-return) valve and check valve are closed rapidly simultaneously, cuts off acetylene air inlet and the breath inverted flame that goes out automatically, because it has multiple-sealed structure, the danger that exhausted nothing refires.

Its most preferred embodiment of flash-back arrestor provided by the utility model as shown in Figure 2.Flash-back arrestor system among Fig. 2 is in closed condition, and wherein (1) is valve body; (2) be fire-stopping pipe; (3) check valve; (4) check (non-return) valve; (5) release link; (6) screen pack; (7) screen pack ring washer; (8) inlet tube; (9) outlet; (10) nut; (11) packing ring; (12) fire-stopping pipe trim ring; (13) release link retainer spring; (14) release link locking ball; (15) release link interlock spring; (16) one-way valve spring; (17)～(22) be sealing ring.

Below in conjunction with Fig. 2 embodiment is made detailed explanation, as can be seen from Figure 2, inlet tube and outlet are mutually perpendicular, inlet tube is positioned at the centre of valve body, promptly in fire-stopping pipe and fire-stopping pipe trim ring, the caliber that its inlet end is one section is more bigger, and the inner wall belt screw thread of this section pipe is to lay screen pack and screen pack ring washer; The outlet side outer wall then has the disc boss, and this boss matches with the position of fire-stopping pipe trim ring band groove, settles sealing ring (17) in the groove of trim ring.Inlet tube is with just utilizing the sealing of sealing circle between the fire-stopping pipe trim ring.The boss opposite side is connected with valve body with nut by packing ring, and inlet tube realizes by one-way valve spring that with the check valve interlock one-way valve spring promptly is stuck between inlet tube boss and the check valve end small boss.Check valve is the uncovered cylinder of the end sealing other end, it is positioned at the fire-stopping pipe trim ring, by being positioned on the sealing ring in the twice groove (18) on its outer wall, (19) contact with fire-stopping pipe trim ring inwall, check valve inlet is made up of the aperture that several radially pass the valve cylinder wall, aperture position is between two o-ring grooves, when check valve is opened, sealing ring (18) breaks away from the fire-stopping pipe trim ring, acetylene gas passes through sealing ring (18) with the space between the fire-stopping pipe trim ring, pass check valve inlet and enter check valve, in case closed check valve, then sealing ring (18) closely contacts with the fire-stopping pipe trim ring, make check valve with sealing between the fire-stopping pipe trim ring, at this moment, acetylene gas can't enter check valve.Check (non-return) valve is the uncovered cylinder of the end sealing other end of a band boss, and its outlet also is made up of several apertures that radially pass the valve cylinder wall, and check (non-return) valve is enclosed within the check valve, and both uncovered directions are relative.The plush copper of check (non-return) valve is equipped with sealing ring (20) facing to a side of check valve, and opposite side then heads on release link interlock spring, and the switching of check (non-return) valve promptly realizes with contacting with the disengagement of check valve inwall by the sealing ring (20) that is enclosed within on its boss.Release link can be divided into different two sections of diameter, its one section diameter with respect to check (non-return) valve is bigger, outer wall has a groove, sealing ring (21) is arranged in the groove, the centre then has a cylinder of settling the bottom band plush copper of release link interlock spring vertically, another section is the less solid cylinder of diameter, and have one radially run through lay the release link retainer spring and be pressed in the hole of the locking ball of both ends of the spring.Outlet is positioned at the valve body outside, and promptly outside fire-stopping pipe, it is connected as a single entity with valve body system.Between inlet tube is with outlet, have four road sealing rings, they be positioned on be in respectively on the fire-stopping pipe trim ring fire-stopping pipe trim ring with the sealing ring between the inlet tube (17) and fire-stopping pipe trim ring with the sealing ring between the valve interior wall (22), be positioned on and be in the check valve outer wall on the check valve with the sealing ring (19) between the fire-stopping pipe trim ring inwall and be positioned on and be in release link on the release link with the sealing ring between the valve interior wall (21), in case, do not have the possibility that leak in acetylene gas air feed gas crack and inverted flame refires extremely so flash-back arrestor cuts out.

In the time the flash-back arrestor shown in Fig. 2 need being opened, as long as the release link of pushing by release link interlock spring, drives check (non-return) valve one check valve idol, the compression one-way valve spring at first makes check valve open.In case after check valve was opened, acetylene gas air feed gas entered check valve, under the air feed gas pressure, make this moment release link interlock spring be in poised state, check (non-return) valve is opened.In case acetylene gas tempering, then fire the tempering gas pressure intensity greater than the release link opening pressure, then release link is forced out, check (non-return) valve cuts out simultaneously, this moment, check valve also can be closed rapidly under the effect of one-way valve spring, just rapid two-way the closing of flash-back arrestor cut off acetylene gas air feed gas and the passage that fires tempering gas simultaneously.It must be noted that, dry acetylene flash-back arrestor provided by the utility model is owing to suitably select one-way valve spring, release link interlock spring and release link retainer spring three's the coefficient of stiffiness, making the release link opening pressure is 0.2MPa, maximum working pressure (MWP) is 0.15MPa, even under the situation that the acetylene gas tempering does not take place, as long as exceeding maximum working pressure (MWP), acetylene gas air pressure is equal to or greater than the release link opening pressure, check valve just can be closed voluntarily, meanwhile, correspondingly ending fiery valve also can close rapidly.Do not possess and this pressure limiting function is known dry acetylene flash-back arrestor, belong to the utility model unique performance, the safety when it can further guarantee to use acetylene gas.

Flash-back arrestor provided by the utility model also has optimized integral structure and prevents the whole special performance that decomposes, by finding out among Fig. 2, whole flash-back arrestor is finished by the assembling of valve body one side, only has a spiral connecting piece, and this spiral connects system and adopts the internal thread connected mode, need to decompose with specific purpose tool in structural design, so more increased the security reliability that flash-back arrestor uses.

Claims (7)

1, a kind of dry acetylene flash-back arrestor, it is made up of valve body (1), fire-stopping pipe (2), backfire by-pass valve, screen pack (6), inlet tube (8), each critical piece of outlet (9), it is characterized in that:

A) inlet tube and outlet are mutually perpendicular, and inlet tube is in the valve body centre, promptly are in the fire-stopping pipe, and outlet is positioned at the valve body outside, promptly is connected as a single entity outside the fire-stopping pipe and with valve body;

B) backfire by-pass valve adopts two-way linkage formula structure, is made up of check valve that links each other (3) and check (non-return) valve (4).

2, by the described acetylene flash-back arrestor of claim 1, it is characterized in that said check valve is the uncovered cylinder of the end sealing other end, have two o-ring grooves on its outer wall, there are several radially to pass the aperture of check valve barrel between two grooves.

3,, it is characterized in that said check (non-return) valve is the uncovered cylinder of the end sealing other end of a band boss, has several radially to pass the aperture of barrel on the cylinder barrel by the described acetylene flash-back arrestor of claim 1.

4, by the described acetylene flash-back arrestor of claim 1, it is characterized in that being provided with in addition a superpressure and open and close indicator, superpressure opens and closes indicator and adopts bar type structure, and it is with being equipped with link gear between the check (non-return) valve.

5, by the described acetylene flash-back arrestor of claim 4, it is characterized in that it is release link (5) that said superpressure opens and closes indicator, it can be divided into different two sections of diameter, its one section diameter with respect to check (non-return) valve is bigger, outer wall has an o-ring groove, and the centre has a cylinder of settling the bottom band plush copper of release link interlock spring (15) vertically; Another section is the less solid cylinder of diameter, and has a hole of laying release link retainer spring (13) and locking ball (14) of radially running through.

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