Electronic expansion valve

Abstract

The invention discloses an electronic expansion valve. According to the electronic expansion valve, a piston part (4) and a valve needle part (3) are located on the same side of a valve element seat (2) so that a bypass through hole (212) can be blocked by the piston part (4) when a refrigerant flows in the forward direction, the refrigerant flows to one end of a vertical connecting pipe (52) through a valve element valve port (211), and the valve needle part (3) moves in the axial direction to adjust the open degree of the valve element valve port (211); when the refrigerant flows in the backward direction, the piston part (4) moves upwards in the axial direction to open the bypass through hole (212), and the refrigerant flows to one end of a transverse connecting pipe (51) through the bypass through hole (212). According to the electronic expansion valve, on one hand, the valve element valve port can be sealed easily by the valve needle part under the high-pressure condition when the refrigerant flows in the forward direction, and the valve needle part is prevented from being ejected open by the high-pressure refrigerant; on the other hand, the axial size and radial size of a valve seat can be reduced, and flow resistance when the refrigerant flows in the backward direction is reduced.

Description

technical field [0001] The invention relates to the technical field of fluid control components, in particular to an electronic expansion valve. Background technique [0002] In the air conditioner market, due to the long distance between the indoor unit and the outdoor unit, two electronic expansion valves are used, and the two electronic expansion valves must be connected in parallel with one-way valves to maximize system efficiency. Its system schematic diagram is as follows figure 1 , the working principle is briefly described as follows: [0003] During cooling: the high-temperature and high-pressure gaseous refrigerant coming out of the exhaust pipe of the compressor 7'8 passes through the D connection and E connection of the four-way valve 7'1, the outdoor exchanger 7'2 (condensation and heat release), the first one-way Valve 7'4 (the first electronic expansion valve 7'3 has no regulating effect), the second electronic expansion valve 7'5 (at this time, the second o...

AI Technical Summary

Problems solved by technology

[0009] First, in the above structure, the one-way valve core 60 is set at the lower part of the valve core seat 22, and the valve needle 24 is respectively set on both sides of the valve core seat 22. When the refrigerant flows in the forward direction, due to the upward impact force of the refrigerant Larger, this requires the buffer spring inside the valve needle 24 to have a larger spring force to ensure that the valve needle 24 is sealed under high pressure conditions, and the increase of the spring force will bring a series of problems, which will increase the rotation of the valve needle 24. Difficult, it will increase the volume of the product. Generally speaking, it is quite good for the spring to be designed to withstand the refrigerant pressure of 2.5MPa and maintain the seal. It is difficult for products with this structure to maintain the seal under the refrigerant pressure of 3.5MPa.

[0010] Second, the one-way valve core 60 is installed on the bottom of the valve core seat 22, and requires the one-way valve core 60 to have a certain stroke. To the height

[0011] Third, since the one-way valve core 60 needs to be provided with a bypass flow path 70, the refrigerant needs to pass through the bypass flow path 70 during reverse flow, resulting in a relatively large reverse flow resistance; on this basis, in order to reduce the reverse flow resistance, it is necessary to The valve seat 20 has a sufficiently large diameter, which in turn leads to a larger radial dimension of the valve seat 20

Images