Piston type hydrogen conveyor for fuel cell

Abstract

The invention discloses a piston type hydrogen conveyor for a fuel cell. The cylinder bodies on both sides of a cylinder piston are respectively provided with position sensors and are respectively provided with a hydrogen inlet and a hydrogen outlet; the hydrogen outlet of a buffer tank is connected with the hydrogen inlet of the fuel cell by a water segregator; the hydrogen inlet of the buffer tank is connected with a path of pipeline of a high-pressure hydrogen source, the other path of pipeline of the high-pressure hydrogen source is connected with the hydrogen inlet at one side of the cylinder by a hydrogen inlet solenoid valve, the hydrogen outlet on the same side of the cylinder body is connected with the buffer tank by a hydrogen outlet solenoid valve, the hydrogen inlet on the cylinder body on the other side of the cylinder piston is connected with the hydrogen tail discharge port of the fuel cell by the hydrogen inlet one-way valve, the hydrogen outlet at the same side of thecylinder body is connected with the buffer tank through a hydrogen outlet one-way valve, and the position sensor is connected with the solenoid valve through a signal wire. The invention has the advantages of electricity saving, good ability of utilizing the energy of high-pressure hydrogen to cause discharged tail hydrogen to flow back, simple structure, easy manufacture, low noise, no oil and corrosion, and high security and reliability.

Description

technical field [0001] The present invention relates to the field of fuel cells, in particular to a hydrogen gas return conveying device in a fuel cell system. Background technique [0002] The proton exchange membrane fuel cell also generates heat and water while generating electricity. Water has two forms: liquid water and gaseous water. If the liquid water accumulates too much in the battery, the small gas channels in the battery bipolar plate will be blocked. , so the gas must be circulated to take away the liquid water in the battery. At the anode of the battery, if the gas circulation is increased to take away the liquid water, part of the hydrogen must be discharged (the effect of intermittently discharging the hydrogen to take away the liquid water is better), which reduces the utilization rate of hydrogen and also makes the hydrogen in the anode. Relative humidity decreases, affecting battery performance. In the prior art, the hydrogen with gaseous water discharge...

AI Technical Summary

Problems solved by technology

[0003] 1. The disadvantages of diaphragm pumps are: high noise, low flow rate, electricity consumption, and no explosion-proof

[0004] 2. Jet pump, the disadvantage is: narrow working range, unstable, not suitable for low-voltage battery system

[0005] 3. Centrifugal pumps, the disadvantages are: extremely low pressure (because hydrogen density is the smallest), high speed, large volume, leakage, not explosion-proof, unable to transport hydrogen containing water, and requires electricity

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