Air compression and expansion integrated device

Abstract

The invention discloses an air compression and expansion integrated device, and relates to the technical field of fuel cell air pressurization systems. The device comprises a volute and an expansion compression impeller arranged in the volute, the expansion compression impeller comprises a first wheel disc and a plurality of first blades arranged on the first wheel disc, a second wheel disc is arranged on the outer sides of the first blades, and a plurality of second blades are arranged on the second wheel disc; the first end of a rotating shaft is fixedly connected with the expansion compression impeller, and the second end of the rotating shaft is connected with an output shaft of a driving motor; a diffuser is arranged between the volute and the second wheel disc, and the diffuser divides an inner cavity of the volute into an expansion cavity and a compression cavity; a first air inlet and a first exhaust port are formed in the side wall of the expansion cavity, and a center line of the first air inlet is perpendicular to an axis of the expansion compression impeller; a center line of the first exhaust port coincides with the axis of the expansion compression impeller; and a second air inlet is formed between the first wheel disc and the second wheel disc, a second exhaust port is formed in the compression cavity, and a center line of the second exhaust port is perpendicular to the axis of the expansion compression impeller.

Description

technical field [0001] The present application relates to the technical field of fuel cell air pressurization systems, in particular to an air compression and expansion integrated device. Background technique [0002] The air compressor is an important part of the cathode air supply system of the vehicle fuel cell system. By pressurizing the inlet air of the fuel cell stack, it can simultaneously improve the power density and efficiency of the fuel cell, reduce the size of the fuel cell, and facilitate water and heat management. And so on. [0003] When the centrifugal compressor is working, the expansion and compression impeller rotates to do work on the gas working medium, throwing the gas into the fixed element behind the expansion and compression impeller, and then forming a vacuum area in the expansion and compression impeller to suck in the external fresh working fluid , The continuous rotation of the expansion and compression impeller can ensure the continuous moveme...

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Problems solved by technology

[0004] The embodiment of the present application provides an integrated device for air compression and expansion, which not only solves the problem of energy waste of exhaust gas in the fuel cell air booster system, but also overcomes the excessive size of the air compressor after adding an expansion wheel for recovery of exhaust gas. The problem of unbalanced load

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