Electromagnetic expansion valve

Abstract

The invention discloses an electromagnetic expansion valve which comprises a valve body (21), a spiral guide rail device (241), a follow-up component (242), magnetic steel (27), a limiting sleeve (31) and a limiting block (25), wherein the spiral guide rail device (241) is fixed on the top wall of the valve body (21); the follow-up component (242) is arranged on the spiral guide rail device (241); the magnetic steel (27) is installed in the valve body (21); the lower end of the rail of the spiral guide rail device (241) is provided with a lower retainer; the limiting sleeve (31) is fixedly connected with the magnetic steel (27); the limiting sleeve (31) is provided with a pushing component which is used for pushing the follow-up component (242) to move along the rail; the limiting block (25) is fixedly connected to the end part of the spiral guide rail device (241), is positioned in the inner cavity of the limiting sleeve (31), and is mutually matched with the inner side wall of the limiting sleeve (31). The electromagnetic expansion valve disclosed by the invention has the advantages of higher vibration-proof performance, stable flow regulation performance, longer service life and smaller volume.

Description

technical field [0001] The invention relates to the technical field of control valves, in particular to an electromagnetic expansion valve. Background technique [0002] In recent years, the application of frequency conversion technology has gradually expanded from the field of household air conditioners to refrigerators, washing machines, water heaters and other fields. system. [0003] The electronic expansion valve is a control valve composed of a stepping motor, a threaded mechanism, a stopper component and a valve port flow adjustment mechanism. It is used in automobiles, and the electronic expansion valve is required to have small size, good anti-vibration performance, High and low temperature environment and other characteristics. [0004] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a typical electromagnetic expansion valve in the prior art. [0005] As shown in the figure, the electromagnetic expansion valve in the prior art inclu...

AI Technical Summary

Problems solved by technology

[0007] However, during the working process, when the screw rod 16 and the magnetic steel 17 move to the fully open state of the electromagnetic expansion valve, the overlapping length of the screw rod 16 and the guide section 182 of the nut 18 becomes shorter, so that the screw rod 16 and the magnetic steel 17 The circumferential restriction becomes smaller, and radial shaking is easy to occur. When used in a car, the shaking will be more severe due to the influence of road conditions, and there may be situations where the magnetic steel 17 hits the valve body 11 and causes it to be stuck. , affect the flow regulation function, or cause the radial sloshing amount of the upper end of the push rod 15 to increase, causing the slip ring 142 to disengage radially from the push rod 15, so that the rotation number of the magnetic steel 17 changes, affecting the thread mechanism and the valve needle. 19 The limiting effect of the stroke of axial lifting; on the other hand, since the spring guide rail is made of steel wire with a smaller diameter, under the influence of vibration, the size of the spring guide rail is easy to change, resulting in instability of control

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