Electronic expansion valve

Abstract

The invention discloses an electronic expansion valve, which is characterized in that a sleeve (4) is fixed in a main valve cavity (11), the lower end part of the sleeve (4) is supported by a valve seat (1), the lower end part of the sleeve (4) wraps a main valve port (441), a valve core seat (2) is axially movably arranged in the sleeve (4), the lower part of a valve needle part (3) extends into the sleeve (4) for opening and closing a valve core valve port (21), and a first communicating hole (41) close to the main valve port (441) and a second communicating port (42) far away from the main valve port (441) are formed in the periphery side wall of the sleeve (4). When a coolant flows forwards, overlarge impact of the coolant on the valve core seat can be avoided due to the structural design of the electronic expansion valve, the valve core seat is prevented from being eccentric, internal leaking is avoided and the work reliability of the system is ensured.

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

[0012] First, if figure 2 As shown, when the refrigerant flows in the forward direction, since the side wall of the valve core seat 2' is facing the horizontal interface part 1'2, the circumferential side wall of the valve core seat 2' will be impacted by the high-pressure refrigerant; when the refrigerant pressure appears When fluctuating, it will cause the spool seat 2' to be eccentric, thus causing the spool seat 2' to not seal the main valve port 1'31 tightly, resulting in large internal leakage and affecting the working performance of the system

In addition, the eccentricity of the valve core seat 2' will also cause interference between the valve needle part 3' and the valve core valve port 2'2

[0013] Second, if image 3 As shown, when the refrigerant flows in the reverse direction, the conduction hole 2'3 is always kept unblocked, so a part of the refrigerant will enter the auxiliary valve chamber 2'1 through the conduction hole 2'3, and enter the auxiliary valve chamber 2'1. The refrigerant will exert a downward force on the valve core seat 2', so the main valve port 1'31 can be opened relatively stably when the refrigerant pressure of the horizontal interface part 1'2 is large enough, so the main valve port 1'31 is opened The sensitivity is not high

Images