A fuel cell air pressure regulating device and system

Abstract

The invention discloses a fuel cell air pressure regulating device, which comprises a valve body, a valve plate, a connecting rod mechanism and a mechanical actuator, the air inlet of the valve body communicates with the air outlet of the electric stack, and the outlet of the valve body passes through the valve plate It is connected with the exhaust gas discharge pipe; the connecting rod mechanism is arranged on the outside of the valve plate, the input end of the connecting rod mechanism is connected with the mechanical actuator, and the mechanical actuator drives the input end of the connecting rod mechanism to move axially along the valve body; the connecting rod The output end of the mechanism is sleeved on the shaft sleeve and fixedly connected with the outside of the valve plate. The invention also provides a fuel cell air pressure regulating system. The beneficial effects of the present invention are: the present invention adopts purely mechanical pressure regulation, air is introduced from the outlet of the air compressor, the slide rod is driven to move through the diaphragm, and the opening and closing of the valve plate is adjusted through the linkage mechanism to realize the air pressure of the fuel cell. Adjusting the decoupling of air compressor speed adjustment saves a lot of control models and algorithms and reduces the complexity of fuel cell control.

Description

technical field [0001] The invention relates to a vehicle fuel cell, in particular to a fuel cell air pressure regulating device and system. Background technique [0002] The fuel cell system includes electric stack, air system, hydrogen system, cooling system and corresponding control system, in which the air system is composed of air filter, air flow meter, air compressor, humidifier, back pressure valve, pressure relief valve and other components , used to provide the stack with the air flow and air pressure required for operation. Due to the different working boundaries of the stack under different working conditions, the requirements for parameters such as the flow rate, temperature, pressure and humidity of the air supplied by the air system will also change accordingly. The air compressor is generally a centrifugal type, and its function is to provide air flow for the stack. The back pressure valve combined with the speed adjustment of the air compressor can control ...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this control method is that this technology uses an electric back pressure valve device, which belongs to the air system stacking pressure adjustment device, but requires the fuel cell controller to control the back pressure valve in real time, and a controller needs a Complicated algorithms that adapt to the pressure adjustment of the back pressure valve, such as pressure drop model, valve position model, feed-forward model, etc., which increase the control complexity of the fuel cell system and increase the system cost. Increased surge risk for centrifugal air compressors

[0004] Chinese patent CN210034431U discloses a fuel cell back pressure valve, which includes a stepping motor and a motor controller. The stepping motor drives a screw sleeve located in the stepping motor to rotate, and the screw sleeve cooperates with the screw rod. The lower end of the screw rod passes through the first guide sleeve and the second guide sleeve in turn, the first guide sleeve is arranged in the inner cavity of the connecting plate, the second guide sleeve is arranged in the inner cavity of the valve body, and the valve body The lower end of the screw rod is fixedly connected with a bottom plate, and the bottom plate is provided with a vent valve hole, and the lower end of the screw rod is connected with a valve plate for closing the vent valve hole, and the upper part of the valve plate is provided with a limit position for limiting the upward movement of the valve plate. The base, the first guide sleeve is provided with a square hole, and the part of the screw rod located in the first guide sleeve is provided with a limit notch that prevents the screw rod from rotating in the square hole; this technical solution solves the problem of the traditional throttle valve There are problems such as poor sealing, wear, and stagnation in the fuel cell system, but there are the following defects: This technology uses an electric control lift-type back pressure valve device, which belongs to the stacking pressure adjustment device of the air system, but requires fuel cell control. The controller controls the back pressure valve in real time, and the controller needs a set of complex algorithms to adapt to the pressure adjustment of the back pressure valve, which increases the control complexity of the fuel cell system and increases the system cost

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