Electronic expansion valve

Abstract

The invention provides an electronic expansion valve. The electronic expansion valve comprises: a first valve seat; a second valve seat, provided with a main valve port; a horizontal connection pipe; a vertical connection pipe; a sleeve, the first end of which is connected to the first end of the second valve seat, and the side wall of the sleeve There are a first flow channel and a second flow channel; the valve seat core is slidably set in the sleeve, including the valve core hole; the valve needle is movably set in the sleeve along the axial direction of the sleeve; the nut , set in the first valve seat, the second end of the sleeve is set in the nut; the screw, reciprocatingly connected in the nut along the moving direction of the valve needle; the first flow channel is opened when the valve seat core opens the main valve port The main valve port is communicated with the inner cavity of the first valve seat; the second flow passage communicates the inner cavity of the sleeve with the inner cavity of the first valve seat when the valve seat core closes the main valve port. According to the electronic expansion valve of the present invention, the coaxiality between the valve needle and the valve core hole of the valve seat core can be effectively ensured, the processing is convenient, and the processing cost is low.

Description

technical field [0001] The invention relates to an electronic expansion valve, in particular to an electronic expansion valve used in refrigeration systems such as air conditioners and refrigerators. Background technique [0002] In the air-conditioning market, due to the long distance between the indoor unit and the outdoor unit, two electronic expansion valves are generally used, and the two electronic expansion valves must be connected in parallel with check valves, so as to maximize the working efficiency of the air-conditioning system . [0003] During the working process of the electronic expansion valve, when the refrigerant flows forward, the valve needle will be opened first, and then flow out from the main valve port on the small valve seat after passing through the valve core hole on the valve seat core. When the refrigerant flows in the reverse direction, the refrigerant will instantly impact the valve seat core, causing the valve seat core to slide in the small...

AI Technical Summary

Problems solved by technology

In order to ensure the normal operation of the electronic expansion valve and to ensure a good relationship between the valve needle and the valve core hole of the valve seat core, the gap between the valve needle and the valve core hole of the valve seat core must be ensured when processing the electronic expansion valve. The coaxiality between them has higher requirements on the processing accuracy of the three, which increases the difficulty of processing and increases the processing cost.

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