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Double-screw compression and expansion all-in-one machine for fuel cell

A technology of compression expansion and fuel cell, which is applied to liquid fuel engines, parts of pumping devices for elastic fluids, mechanical equipment, etc., and can solve the problems of less recovery work, large intake pressure loss, and high-pressure orifice area of ​​expanders. Small and other problems, to achieve the effect of improving recovery work, reducing load, and improving motor efficiency

Active Publication Date: 2021-05-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of the existing twin-screw compression-expansion integrated machine that the expander high-pressure orifice area is too small, the intake pressure loss is large, and the recovery work is small

Method used

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  • Double-screw compression and expansion all-in-one machine for fuel cell
  • Double-screw compression and expansion all-in-one machine for fuel cell
  • Double-screw compression and expansion all-in-one machine for fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0029] see figure 1The twin-screw compression-expansion integrated machine for fuel cells provided by the present invention includes a machine body composed of a casing and a compressor rotor and an expander rotor separated in the casing. The casing adopts a five-section structure composed of compressor bearing housing 8, compressor rotor chamber 5, middle section housing 4, expander rotor chamber 1 and expander bearing housing 9 which are spliced ​​in sequence. The compressor rotor includes a compressor male rotor 6 and a compressor female rotor 7 installed in the compressor rotor chamber 5, and the expander rotor includes an expander male rotor 2 and an expander female rotor installed in the expander rotor chamber 1 3. The compressor female rotor 7 and the expander male rotor 2 are coaxially connected through the first rotor shaft 21, and the compressor female rotor 7 and the expander male rotor 2 are fixed to the first rotor shaft 21; the compressor male rotor 6 and the T...

Embodiment 2

[0038] The difference from Embodiment 1 is that the above-mentioned self-lubricating bearing 18 is replaced with a structural form similar to the grease-lubricated cylindrical rolling bearing and seal installed on the compressor bearing housing 8 . That is, a grease-lubricated cylindrical rolling bearing is installed in the concave holes opened at both ends of the female rotor 3 of the expander, the inner ring of the grease-lubricated cylindrical rolling bearing is connected and fixed to the second rotor shaft 20, and the outer ring of the grease-lubricated cylindrical rolling bearing is connected and fixed to the corresponding concave hole. Therefore, the short service life of the compression-expansion integrated machine caused by the relatively poor wear resistance of the self-lubricating bearing is overcome, and it is more conducive to practical application.

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Abstract

The invention discloses a double-screw compression and expansion all-in-one machine for a fuel cell. According to the all-in-one machine, high-pressure orifices are formed in positions close to the middle of a machine body, and low-pressure orifices are formed in the two ends of the machine body; a female rotor of a compressor and a male rotor of an expander are coaxially connected and fixed, a male rotor of the compressor and a female rotor of the expander are also connected through a rotor shaft, the male rotor of the compressor is fixed to the rotor shaft, and the female rotor of the expander and the rotor shaft are in clearance fit and slide mutually; and the low-pressure side of the expander is connected with a motor. According to the all-in-one machine, the number of bearings is reduced, the size, weight and cost are lowered, the rotating speed of the expander is effectively lowered by the rotor gear ratio, and flow matching of the compressor and the expander is realized; and meanwhile, the load of the bearings is effectively lowered through the stress balance effect of the compressor rotors and the expander rotors, the power loss of the bearings is reduced, and the problem that the recovery work is little when the expander is at a low load is solved.

Description

technical field [0001] The invention relates to the field of twin-screw machinery, in particular to a twin-screw compression-expansion integrated machine for fuel cells. Background technique [0002] Under the dual pressure of energy crisis and environmental protection, hydrogen fuel cells have attracted special attention from all walks of life due to their advantages such as high energy conversion efficiency, environmental friendliness, renewability and low noise. As the most important part of the fuel cell air supply subsystem, the air compressor is to pressurize the air in the atmospheric environment to the optimum operating pressure of the fuel cell stack, and provide the required air mass flow rate according to the actual working conditions , can greatly improve the power density and efficiency of fuel cells, reduce volume and cost. [0003] Due to the advantages of high efficiency, large pressure ratio, and high reliability, twin-screw compressors have been widely use...

Claims

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Application Information

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IPC IPC(8): F04C18/16F04C29/12F04C29/04F04C29/02F04C29/00
CPCF04C18/16F04C29/12F04C29/04F04C29/02F04C29/00F04C2240/50Y02E60/50
Inventor 王闯邢子文李彦澎王炳棋张震
Owner XI AN JIAOTONG UNIV