Back-fire arrestor

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

technical field [0001] The invention relates to a backfire preventer, in particular to a backfire prevention device used on a gas welding and cutting tool. Background technique [0002] There are two types of flashback arrestors (also known as flashback fuses) currently on the market, namely dry flashback arrestors and water-sealed flashback arrestors. The working principles and structures of these two flashback preventers are different: when the water-sealed flashback preventer is in normal operation, acetylene enters from the air inlet at the bottom, opens the check valve at the top, and enters the welder from the air outlet through the filter. (cut) torch. When burning back occurs, the flame pours the tank from the gas outlet, pushes open the rubber membrane, so that the combustion flame escapes into the air from the gas release port, and on the other hand, the pressure of the combustion flame closes the check valve, cutting the gas path, so that the flame cannot enter t...

AI Technical Summary

Problems solved by technology

Its main disadvantage is that it cannot prevent the airflow with high combustion pressure, and thus cannot effectively prevent the tempering. Therefore, this type of flashback preventer is rarely produced by manufacturers; and the dry tempering When the preventer is working normally, the acetylene gas enters from the air inlet at the bottom, flows into the smaller explosion chamber, and enters the welding (cutting) torch from the gas outlet. emit into the air

Its main disadvantage is that the internal structure of this type of flashback preventer is a straight-through type, and the gas source cannot be effectively blocked after flashback occurs, which in turn poses certain threats and hidden dangers to personal safety

Images