Electronic expansion valve

Abstract

The invention discloses an electronic expansion valve. A valve body, a valve base and a valve element assembly are included. The valve element assembly comprises a lead screw and a drive piece capableof driving the lead screw to axially move. The end, located in the valve body, of the lead screw is provided with a valve needle capable of being matched with the valve base. The valve body comprisesa medium inlet and a medium outlet which are connected through a communication cavity, and the valve base is arranged in the communication cavity. The valve base comprises a throttling hole communicating with the medium outlet and a through hole communicating with the medium inlet, a containing cavity is formed by the valve base between the throttling hole and the through hole, and a damping mechanism for stabilizing the vibrating valve needle is arranged in the containing cavity. The valve base is provided with a pressure sensor capable of sensing force application to the valve base throughthe vibrating valve needle, and the pressure sensor is in signal connection with the damping mechanism. The electronic expansion valve has the following beneficial effects that the electronic expansion valve has the self protection function for the valve needle under the vibration situation, and accordingly stable control performance is provided for adjustment of the valve port throttling area through the valve needle.

Description

technical field [0001] The invention relates to the field of flow control, in particular to an electronic expansion valve. Background technique [0002] The electronic expansion valve is installed between the condenser and the evaporator, which is the dividing point between the high pressure and the low pressure of the air conditioning and refrigeration system. Its function is: throttling and depressurizing the high-pressure liquid refrigerant from the condenser, and adjusting and controlling the amount of liquid refrigerant entering the evaporator to adapt to the change of refrigeration load. The driving method of the electronic expansion valve is that the controller calculates the parameters collected by the sensor, sends adjustment commands to the drive board, and the drive board outputs electrical signals to the electronic expansion valve, and then drives the electronic expansion valve rotor assembly through the coil to realize the valve. The needle moves up and down to...

AI Technical Summary

Problems solved by technology

[0003] Electronic expansion valves have been widely used in household air conditioners, but the working conditions of electronic expansion valves for vehicles are more complicated

For example, when a car is driving, it will inevitably vibrate due to different road conditions. The vibration of the vehicle will cause the valve needle of the electronic expansion valve to vibrate and fail to work, or cause a large error in the control of the amount of refrigerant in the electronic expansion valve.

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