Micro electromechanical silicon expansion valve

Abstract

The invention provides a silicon expansion valve in micro electromechanical slide control, comprising a main valve body and a valve core. A valve cavity is arranged in the main valve body, the valve core is closely mounted in the valve cavity and can move up and down in the valve cavity, the valve cavity is communicated with an entry pipe and an exit pipe arranged on the main valve body and divided by the valve core into an upper cavity and a lower cavity which are not communicated, the upper cavity is internally provided with an upper spring for pushing the valve core downwards, the lower cavity is internally provided with a lower spring for pushing the valve core upwards, and the valve core moves up and down to control the flow between the entry pipe and the exit pipe. The silicon expansion valve also comprises a silicon diversion valve mounted on the main valve body, and the silicon diversion valve is a three-port PDA (Personal Digital Assistant) device which is communicated with the entry pipe through an entry diversion pipe, communicated with the exit pipe through an exit diversion pipe and communicated with the upper cavity through a diversion valve channel. The invention has small dimensions, high control accuracy, good sealing effect and long service life, is easy to control and is an ideal control valve for the refrigerant flow of a refrigeration air conditioner.

Description

technical field [0001] The invention relates to an expansion valve used in refrigeration or heating systems, in particular to a micro-electromechanical silicon expansion valve for controlling the flow of refrigerant. Background technique [0002] At present, expansion valves are generally divided into two categories: thermal expansion valves and electronic expansion valves. The thermal expansion valve detects the temperature of the refrigerant through the temperature-sensing medium and converts it into the pressure of the temperature-sensing medium to adjust the opening of the expansion valve and the flow of the refrigerant. The adjustment range is relatively small and the time lag is large. The electronic expansion valve detects the temperature of the refrigerant through an electric or magnetic sensor, and uses electric actuators to adjust the opening of the expansion valve and the flow of the refrigerant. The adjustment range is large and the response is quick. When the c...

AI Technical Summary

Problems solved by technology

The electronic expansion valve with stepping motor as the executive part has high control precision, but the structure is complex; the electronic expansion valve with electromagnet as the executive part has a relatively simple structure, but the control accuracy is low, and it is easy to generate oscillation

Images