Single-tooth air compressor for fuel cell and design method of rotor of single-tooth air compressor

Abstract

The invention discloses a single-tooth air compressor for a fuel cell and a design method of rotors of the single-tooth air compressor. The single-tooth air compressor is composed of a driving shaft (1), a driven shaft (2), a first-stage left gear single-tooth rotor (9), a first-stage right gear single-tooth rotor (10), a second-stage left gear single-tooth rotor (13) and a second-stage right gear single-tooth rotor (14). Curves of all sections of the end face molded line of the gear single-tooth rotor are smoothly connected. In the meshing process, point-by-point continuous meshing of the end face molded lines of the pair of single-tooth rotors can be achieved. The connecting line, the tooth top arc and the tooth bottom arc are adopted to replace a common pitch circle arc, the closed volume formed between the two gear single-tooth rotors and the air cylinder is gradually reduced in the working process, the internal compression process is achieved, the sealing performance is improved, and the service life is prolonged. The leakage of a working medium from a high-pressure side working cavity to a low-pressure side working cavity through a gap can be effectively reduced, and the volume efficiency of the single-tooth air compressor is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of compressor engineering, in particular to a single-tooth air compressor used for fuel cells and a design method for a rotor thereof. Background technique [0002] Fuel cell is an efficient and clean power generation device, and it is an effective way to solve the problem of fossil energy shortage. The air compressor is the key equipment for the fuel cell to provide reaction air. Chinese patent (Tao Lin, Bai Jiangtao, Huang Xizhen. A two-stage centrifugal compressor for fuel cells [P]. Beijing: CN113323893A, 2021-08-31.) discloses a compressor for fuel cells The two-stage centrifugal compressor is characterized by increasing the output power of the fuel cell, reducing the volume and weight of the system, and making the system compact. However, compared with the positive displacement compressor, the centrifugal compressor has a smaller compression ratio and has a long-term low flow rate. Running at high sp...

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Problems solved by technology

[0005] Aiming at the problems of short leakage channel, large leakage and low volumetric efficiency when the pitch circle of the single-tooth rotor meshes with the pitch circle of the single-tooth rotor during the working process of the single-tooth air compressor for fuel cells, the present invention proposes a fuel cell A single-tooth air compressor with a battery, and a new type of full-mesh smooth gear single-tooth rotor for this air compressor is constructed. Composition, and the equations of the rotor tooth head, rotor groove, arc-shaped pitch circle convex tooth and arc-shaped pitch circle groove end surface profile are given; the curves of the end surface profile of the proposed gear single-tooth rotor are smoothly connected ;During the meshing process, the left arc pitch circle and the right arc pitch circle mesh continuously point by point, and no closed volume is formed; the present invention uses connecting lines, tooth top arcs and tooth bottom arcs to replace the commonly used pitch circle arcs , which not only satisfies the requirement that during the working process, the closed volume formed between the two gear single-tooth rotors and the cylinder gradually decreases, has an internal compression process, but also improves the sealing performance, which can effectively reduce the gas from the high-pressure side working chamber through the gap Leakage to the working chamber of the low-pressure side significantly improves the volumetric efficiency of the single-tooth air compressor; development is important

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