Piston type pneumatic circulating gas pump

Abstract

The invention discloses a piston type pneumatic circulating gas pump which comprises a circulating gas pump body, a gas reversing mechanism, a buffering tank and an electric pile. The circulating gas pump body comprises a big cylinder and small cylinders, a big piston is arranged in the big cylinder and divides the big cylinder into two cavities, a small piston is arranged in each small cylinder and divides the corresponding small cylinder into two cavities, the gas reversing mechanism comprises a two-position five-way reversing valve and a replacing mechanism with one end connected with the circulating gas pump body and the other end connected with the two-position five-way reversing valve, a gas outlet of the electric pile is communicated with a third cavity in the big cylinder through a first check valve and further communicated with a fourth cavity in the big cylinder through a second check valve, the third cavity is communicated with a gas inlet of the buffering tank through a third check valve, and the fourth cavity is communicated with the gas inlet of the buffering tank through a fourth check valve. Circulatory flowing of hydrogen in the electric pile is realized through expansion work released during decompression of compressed hydrogen.

Description

technical field [0001] The present invention relates to a piston type air pump, more specifically, relates to a piston type pneumatic circulating air pump. Background technique [0002] A proton exchange membrane fuel engine system is a power generating device that directly converts the chemical energy in a fuel (usually hydrogen or methanol) into electrical energy through an electrochemical reaction. Unlike conventional power plants, it does not need to convert the chemical energy in the fuel first into heat and then into electricity. Therefore, compared with traditional power generation devices, fuel cells have the significant advantages of high energy conversion efficiency and less pollutant emissions. [0003] In order to ensure the continuous and normal operation of the proton conduction membrane fuel cell system (referred to as PEMFCS), it is necessary to discharge the liquid water and impurity gas condensed on the anode interface of the stack in time. Existing PEMFC...

AI Technical Summary

Problems solved by technology

For fuel cell vehicles, the discharge of hydrogen from the stack is a waste of fuel (the lost H 2 Fuel up to 5%) has potential safety hazards, and will cause pressure fluctuations inside the stack, which will affect the service life of the membrane electrodes; using electric gas pumps to realize hydrogen circulation requires power consumption, and at the same time, it will generate noise and vibration that are difficult to eliminate , affecting the fuel economy, safety and comfort of the vehicle

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