Automatic evacuation filling machine for nitrogen and hydrogen filling and leak detection

Abstract

The invention discloses an automatic evacuation filling machine for nitrogen and hydrogen filling and leak detection. The filling machine comprises a gas cylinder, a vacuum pump and a filter, and thevacuum pump is connected a four-way connection through a link pipe; the part, between the vacuum pump and the four-way connection, of the link pipe is provided with an evacuation valve, and the four-way connection is connected to an evacuation and air charging connection through the link pipe; and the part, between the four-way connection and the evacuation and air charging connection, of the linkpipe is provided with a pressure sensor, and the four-way connection is connected to an exhaust port through an exhaust pipe which is provided with a first blowoff valve and a second blowoff valve separately. The nitrogen and hydrogen mixed trace gas comprises 95% of nitrogen and 5% of hydrogen, and the detectable leak rate of the trace gas can also reach 1*10<-7> mbarl/s; moreover, the mixed gasis not explosive, safe and low in cost of gas sources, and the emission of the mixed gas does not cause environmental pollution; the filling machine integrates three processes of evacuation, fillingand discharge, and is high in degree of automation; and the filling machine is used for leak detection through cooperation of customers, and the working efficiency is improved greatly.

Description

technical field [0001] The invention belongs to a leak detection device, in particular to an automatic evacuation filling machine for leak detection of nitrogen and hydrogen filling. Background technique [0002] In the past, air conditioner leak detection used refrigerant and helium as the indicator gas. The lowest detectable leak rate of refrigerant is -5mbarl / s of 1*10, and the accuracy is low. The refrigerant is generally charged through the refrigerant steel cylinder or delivery pipe. Direct filling by road without special equipment; the leak detection rate of helium can reach -7 mbarl / s of 1*10, with high precision, but the cost of helium is high, and the equipment for helium filling and recovery is complicated and expensive, which is not conducive to popularization use. Contents of the invention [0003] The object of the present invention is to provide an automatic evacuation and filling machine for leak detection of nitrogen and hydrogen filling, so as to solve t...

AI Technical Summary

Problems solved by technology

[0002] In the past, air conditioner leak detection used refrigerant and helium as the indicator gas. The lowest detectable leak rate of refrigerant is -5mbarl / s of 1*10, and the accuracy is low. The refrigerant is generally charged through the refrigerant steel cylinder or delivery pipe. Direct filling by road without special equipment; the leak detection rate of helium can reach -7 mbarl / s of 1*10, with high precision, but the cost of helium is high, and the equipment for helium filling and recovery is complicated and expensive, which is not conducive to popularization use

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