Safety release device for vehicle natural gas valve and assembling process thereof

Abstract

The invention relates to a safety release device for a vehicle natural gas valve. The safety release device comprises a release device body and a flange arranged on the release device body; a pressure relief channel is formed in the release device body; the flange is provided with a plurality of pressure relief holes; the pressure relief channel is communicated with the pressure relief holes; fusible alloy is poured in the pressure relief holes and the pressure relief channel; the fusible alloy in the pressure relief channel is positioned in a vacant state, a fusible alloy post is inserted into the end part of the pressure relief channel and tightly extrudes the fusible alloy poured in the pressure relief channel. The assembling process for the safety release device for the vehicle natural gas valve comprises the following steps of a, integrally forming the release device body and the flange by using a die; b, pouring fluid fusible alloy into the pressure relief holes and the pressure relief channel by using a pouring tool; c, inserting the pre-formed fusible alloy post into the pressure relief channel to extrude the poured fusible alloy. The safety release device is simple in structure, timely in pressure relief and convenient and quick to assemble.

Description

technical field [0001] The invention relates to a natural gas valve for a vehicle, in particular to a safety release device for a natural gas valve for a vehicle and an assembly process thereof. Background technique [0002] Natural gas is a multi-component mixed gaseous fossil fuel. The main component is alkanes, of which methane accounts for the vast majority, and a small amount of ethane, propane and butane. It has the advantages of high calorific value and cleanness. Natural gas is commonly used The combustion gas can be used not only as a civil fuel but also as a power source for industrial fuels and vehicle engines. Now most of the natural gas used for vehicles is transported and stored through steel cylinders. Valves are installed at the openings of the cylinders to control The opening and closing and output flow of the gas, but as a flammable gas, when the external temperature is too high or a large collision occurs, the gas in the cylinder will expand. If the vehicl...

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Problems solved by technology

[0003] When the fusible alloy of the existing safety relief device is poured, the fusible alloy block is melted and then the pressure relief channel 3a and the pressure relief hole 4a are filled directly. The blasting hole in channel 3a overflows, resulting in waste of expensive fusible alloy, and this pouring method is prone to internal shrinkage cavities, and the fusible alloy is not firmly bonded to the pressure relief channel and pressure relief hole. It is easy to be squeezed out, resulting in leakage or premature pressure release;

[0004] And the blasting pressure of safety blasting foil is related to the caliber of the orifice at the opening of the pressure relief passage 3a, the burst pressure set by any safety relief device has a direct relationship with the caliber of the orifice at the opening of the pressure relief passage 3a, and the size of the caliber directly The stability of blasting is affected. After the existing safety relief device is filled, the fusible alloy remaining on the end face of the opening of the pressure relief channel 3a must be cut, which is very easy to damage the arc at the opening of the pressure relief channel 3a. If the orifice diameter is chamfered, once the orifice diameter is damaged, the burst pressure of the safety blasting foil fixed at the opening of the pressure relief channel 3a will change, which will affect the stability of the blasting, and the pressure relief will not be timely or excessive. Serious consequences of premature pressure relief, resulting in serious safety accidents and property losses

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