CN102080825A

CN102080825A - Back-fire arrestor

Info

Publication number: CN102080825A
Application number: CN2009101543201A
Authority: CN
Inventors: 张建达
Original assignee: NINGBO LONGXING WELDING AND CUTTING EQUIPMENT CO Ltd
Current assignee: NINGBO LONGXING WELDING AND CUTTING EQUIPMENT CO Ltd
Priority date: 2009-11-26
Filing date: 2009-11-26
Publication date: 2011-06-01
Anticipated expiration: 2029-11-26
Also published as: CN102080825B

Abstract

The invention discloses a back-fire arrestor which comprises a main body, an input joint, a one-way valve and an output joint, wherein the input joint is connected with the main body; the one-way valve is installed in the cavity of the main body; a spring seat is arranged in the cavity of the main body; the output joint is connected with the end part of the spring seat; one end of a valve spring is sleeved on the head part of the spring seat, and the other end of the valve spring abuts against a valve core; and a potted component and a fire-stopping pipe which is arranged above the spring seat are lined between the valve core and the input joint. The back-fire arrestor is characterized in that the potted component is a valve pad made of a fluororubber material; the fire-stopping pipe is prepared by sintering 80-100 mesh stainless steel particles; in a gas through return passage, gas enters from the middle passage, and the gas is discharged from the edge passages; when a gas negative pressure generated by backfire flame is higher than a forward normal pressure, the one-way valve of the back-fire arrestor is quickly closed, thereby effectively cutting a gas source off; because the one-way control valve takes fluororubber as a sealing material, so that the closing property and service life of the one-way valve are greatly improved; and the backfire ratio is effectively improved, simultaneously, the safe property is also improved, and the service life of the arrestor is prolonged.

Description

A kind of flash-back arrestor

Technical field

The present invention relates to a kind of flash-back arrestor, relate in particular to the anti-backfire device that is used on the gas welding cut bit.

Background technology

The flash-back arrestor of Shi Yonging (also claiming flashback arrester) has two kinds in the market, i.e. dry flashback arrestor and water-sealing back fire arrester.These two kinds of flash-back arrestor operation principles and structure are different: water-sealing back fire arrester is when operate as normal, and acetylene enters from bottom air inlet, backs down check-valves, enters weldering (cutting) torch from the gas outlet through cleaner.When flashing back, flame is from the gas outlet tank switching, back down rubber membrane, combustion flame is escaped into the air from gas vent, and combustion flame pressure is closed check-valves on the other hand, the cutting gas circuit, make flame can't enter the acetylene gas generating means, in addition, the water in the cylindrical shell has also been blocked the path of flame, plays the effect of insurance.Its major defect is the effect that the bigger air-flow of combustion pressure is not had prevention, and then can not effectively stop tempering, and therefore, such flash-back arrestor now seldom has manufacturer producing; And dry flashback arrestor is when operate as normal, and acetylene gas enters from bottom air inlet, flows into less explosion chamber, enters weldering (cutting) torch by the gas outlet, and when flashing back, explosion-proof rubber membrane moment is broken through, and burning gases are dispersed in the air very soon.Its major defect is that the flash-back arrestor internal structure of the type is a through type, and can not effectively block source of the gas after flashing back, and then personal safety has been caused certain threat and hidden danger.Given this, await the structure of this dry flashback arrestor is improved.

Summary of the invention

Technical problem to be solved by this invention provides a kind of flash-back arrestor, effectively improves the tempering rate that prevents, has also improved security performance simultaneously, has increased the life-span of preventer.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of flash-back arrestor, comprise main body, input adapter that is connected with main body and out splice going splice, be installed in the check valve in the body cavity, check valve is by the valve core, valve spring, spring base is formed, spring base is arranged in the body cavity, one end of valve spring is nested with on the spring base head, the other end of valve spring is connected with the valve core is inconsistent, be lined with potted component between valve core and the input adapter and be positioned at fire-stopping pipe above the spring base, it is characterized in that: the valve pad that described potted component adopts the fluorubber material to make; What described fire-stopping pipe adopted is the fire-stopping pipe that 80-120 purpose stainless steel particle sintering is made, gas flows to the outer rim passage that cavity forms between main body and the fire-stopping pipe by the tube wall of fire-stopping pipe, the outer rim passage is communicated with out splice going splice by the sulculus of spring base, the logical loop of the gas that air inlet in the middle of forming, wing are given vent to anger.

As improvement, described fire-stopping pipe right-hand member seals with Hpb59-1 copper, and the flow design of fire-stopping pipe is 15m ³/ h.

At last, described main body is processed into by H62 copper.

Compared with prior art, the invention has the advantages that:

1. can stop the flame that strile-backs to enter oxygen or acetylene gas flexible pipe until entering acetylene gas bottle by weldering (cutting) torch and flash-back arrestor;

2. the gas negative pressure that produces when the flame that strile-backs is higher than the forward normal pressure, and the flash-back arrestor check valve is closed rapidly, effectively cuts off source of the gas; Utilize fire-stopping pipe the flame blocking-up of strile-bacing;

3. one-way control valve adopts fluorubber as encapsulant, and this material heat-resistant, wear-resistant is difficult for being broken through and damaging, and closed check valve performance and service life are improved greatly;

4. because of fire-stopping pipe one end adopts the sealing of Hpb59-1 copper, so can further improve the security performance of this flash-back arrestor.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the spring base structure cutaway view of Fig. 1;

Fig. 3 is the valve mat structure cutaway view of Fig. 1;

Fig. 4 is the fire-stopping pipe structure cutaway view of Fig. 1.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Shown in Fig. 1-4: a kind of flash-back arrestor, comprise main body 1, main body 1 is processed into by H62 copper, be threaded in input adapter 9 and out splice going splice 2 on the main body 1, in be lined with O RunddichtringO 6, be installed in the check valve in main body 1 cavity, check valve is by valve core 8, valve spring 5, spring base 3 is formed, spring base 3 is arranged in main body 1 cavity, one end of valve spring 5 entangles firm on spring base 3 heads, the other end of

valve spring

5 and 8 inconsistent connections of valve core, fire-stopping pipe 4 is positioned at above the spring base 3, key point is: what fire-stopping pipe 4 adopted is the fire-stopping pipe that 80-120 order stainless steel particle sintering is made, the fire-stopping pipe 4 that present embodiment adopts 100 order stainless steel particle sintering to make, gas flows to the outer rim path 10 by the tube wall of fire-stopping pipe 4, and the outer rim path 10 is formed by cavity between main body 1 and the fire-stopping pipe 4, the outer rim path 10 is communicated with out splice going splice 2 by the sulculus of spring base 3, air inlet in the middle of forming, the gas that wing is given vent to anger leads to the loop; Fire-stopping pipe 4 other end right-hand members seal with Hpb59-1 copper, and the flow design of fire-stopping pipe 4 is 15m ³/ h adopts 80-120 order stainless steel particle sintering to make, and improving the security performance of flash-back arrestor, and can effectively stop the generation of tempering accident; The potted component that is lined with between valve core 8 and the input adapter 9 adopts the valve pad made from the fluorubber material 7, and this material heat-resistant, wear-resistant is difficult for being broken through and damaging, and closed check valve performance and service life are all improved greatly.

Its operation principle is as follows: after gas inserts flash-back arrestor, at first pass through check valve, unidirectional force is that 0.0005Mpa enters the fire-stopping pipe endoporus, flow to the outer rim path 10 of gas by the tube wall of fire-stopping pipe 4, enter the circulation sulculus of spring base 3 and then flow to outlet, be connected to the cutting tool of using gases in the outlet, when the cutting tool tempering, cause gas circuit band fire negative pressure, reverse flow is to the outlet of flash-back arrestor; Because of the flow design of fire-stopping pipe 4 is 15m ³/ h, adopt 80-120 order stainless steel particle sintering to make, fire-stopping pipe 4 can only make the air communication mistake, and naked light is passed through, so the fire of the band during tempering negative pressure is stopped in fire-stopping pipe 4 ends, because of the effect of check valve, increasing of negative pressure impelled closed check valve during owing to tempering in addition, stop the gas forward to flow into, and then stoped the generation of tempering incident.

Claims

1. flash-back arrestor, comprise main body, the input adapter that is connected with main body and out splice going splice, be installed in the check valve in the body cavity, check valve is made up of valve core, valve spring, spring base, spring base is arranged in the body cavity, one end of valve spring is nested with on the spring base head, the other end of valve spring is connected with the valve core is inconsistent, be lined with potted component between valve core and the input adapter and be positioned at fire-stopping pipe above the spring base, it is characterized in that: the valve pad that described potted component adopts the fluorubber material to make; What described fire-stopping pipe adopted is the fire-stopping pipe that 80-120 purpose stainless steel particle sintering is made, gas flows to the outer rim passage that cavity forms between main body and the fire-stopping pipe by the tube wall of fire-stopping pipe, the outer rim passage is communicated with out splice going splice by the sulculus of spring base, the logical loop of the gas that air inlet in the middle of forming, wing are given vent to anger.

2. flash-back arrestor according to claim 1 is characterized in that: described fire-stopping pipe right-hand member seals with Hpb59-1 copper, and the flow design of fire-stopping pipe is 15m ³/ h.

3. flash-back arrestor according to claim 1 is characterized in that: described main body is processed into by H62 copper.