An electronic expansion valve

Abstract

The invention discloses an electronic expansion valve, a valve body, a valve seat and a valve core assembly. The valve core assembly includes a screw rod and a driving member capable of driving the screw rod to move axially. One end of the screw rod in the valve body is A valve needle that can be matched with the valve seat is provided. The valve body includes a medium inlet and a medium outlet. The medium inlet and the medium outlet are connected through a communication cavity, and the valve seat is placed in the communication cavity; The throttle hole and the through hole connected with the medium inlet, the valve seat forms a housing chamber between the throttle hole and the through hole, and the housing chamber is equipped with a vibration damping mechanism that can maintain the stability of the vibrating valve needle. The seat is provided with a pressure sensor capable of sensing vibration and exerting force on the valve seat, and the pressure sensor is connected with the vibration damping mechanism for signals. The invention has the following beneficial effects: the electronic expansion valve has a self-protection function for the valve needle under the condition of vibration, thereby providing stable control performance for the valve needle to adjust the throttling area of ​​the valve port.

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, and is the dividing point between the high pressure and low pressure of the air conditioning and refrigeration system. Its function is to throttle and reduce the pressure of the high-pressure liquid refrigerant from the condenser, and adjust and control 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 an adjustment command to the drive board, and the drive board outputs an electrical signal to the electronic expansion valve, and then drives the rotor assembly of the electronic expansion valve through the coil to realize the valve. The needle moves up and d...

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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