Electronic expansion valve

Abstract

The invention relates to an electronic expansion valve, belonging to the technical field of parts used in the refrigeration system. The prior art has the drawback that the screw thread guiding component is inclined to be loose and even pull-off from the valve base. The invention is characterized in that: a concave part is arranged at the place corresponding to the valve port on the valve base; the circumferential direction of the lower end of the screw thread guiding component is positioned in the concave part; a positioning part is arranged on the screw thread guiding component and stands outside of the valve base; a pull-off-proof component is sleeved the screw thread guiding component and touches the positioning part; the anti-fallingcomponent is fixedly connected with the valve base. Thus the screw thread guiding component is reliably fixed, which prevents the loosening due to friction and vibration. The invention has an advantage that the invention is particularly suitable for the refrigeration circulation which adopts comparatively high-pressure CO2 coolant, due to the reinforcement of the screw thread guiding component.

Description

technical field [0001] The invention relates to components used in refrigeration systems, in particular to an electronic expansion valve for regulating the flow of refrigerant, especially using CO 2 (Carbon dioxide gas) The electronic expansion valve of the refrigeration cycle device of the refrigerant. Background technique [0002] An electronic expansion valve installed in a refrigeration cycle system as a flow control valve, including a valve seat, an outer cover and a coil located outside the outer cover: two connecting pipes are connected to the valve seat, and a valve located between the two connecting pipes is opened in the valve seat Corresponding to the valve port, a threaded guide is provided; the outer cover is connected to the valve seat and forms a closed cavity above the valve port; a magnetic rotor part with an induction coil magnetic field is arranged in the closed cavity, and the magnetic rotor part is connected to There is a valve needle and a threaded pro...

AI Technical Summary

Problems solved by technology

[0008] The friction between the single-slave moving parts and the vibration of the system lead to the loosening of the threaded guide and in the case of an interference fit between the threaded guide and the recess, high pressure may lead to the possibility of the threaded guide being disengaged from the valve seat , the existence of these defects will lead to the failure of the electronic expansion valve and the failure of the refrigeration system even in the refrigeration system using Freon as the refrigeration circulation medium; while for the CO 2 (Carbon dioxide gas) as the refrigeration system of the refrigeration circulation medium, there are also the following defects:

[0009] The existence of large friction force will make the action of the electronic expansion valve slow and inflexible if it is light, and it will hinder the action of the electronic expansion valve if it is serious;

[0010] Due to the rapid wear of the above-mentioned parts during the action caused by friction, the accuracy of the fit is lost, and the electronic expansion valve is quickly scrapped;

[0011] Metal shavings produced by friction will be mixed in the CO 2 If the refrigeration circulation medium flows together, it may cause the circulation path to be blocked or even blocked, which will affect the normal operation of the entire refrigeration system

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