Valve core component and thermal expansion valve using same

Abstract

The invention relates to a valve core component and a thermal expansion valve using same, belonging to the technical field of refrigeration control. The valve core component comprises a valve sleeve (7), a valve core seat (1), a valve core (2), an elastic body and a support seat (6), wherein the valve core seat (1) is fixed on the valve sleeve (7) and is provided with a valve port (12); the valve core (2) is placed into the inner cavity of the valve core seat (1); and the support seat (6) is used for supporting the valve core (2) through the elastic body. The valve core component is characterized by further comprising a valve core guide piece (3) which is fixed in the inner cavity of the valve core seat (1) and is provided with a plurality of flow channels, and a valve core support seat (4). In the invention, the axis deviation of the valve core is controlled by setting the valve core guide piece, and the valve port (12) of the valve core seat (1) and the valve core support seat (4) are butted with the valve core (2) through cambered surfaces, so that transverse stress of the valve core (2) can be eliminated, the requirement of coaxiality between the valve core (2) and the valve port (12) is met, and the adjusting accuracy and closing air tightness of a valve are enhanced.

Description

technical field [0001] The invention belongs to the technical field of refrigeration control and is suitable for vapor compression heat pump systems (such as air-conditioning systems) and the like, and in particular relates to a valve core component and a thermal expansion valve using the component. Background technique [0002] The expansion valve as a throttling device is widely used in the circuits of refrigeration systems such as air conditioners, refrigerators, and heat pumps. It controls the flow of refrigerant by sensing the temperature / pressure of the refrigerant at a specific location. It plays the role of throttling and reducing pressure and regulating the flow of refrigerant. In large-scale refrigeration equipment, replaceable core thermal expansion valves are often used. For valves of this type of structure, the valve core parts can be replaced according to the system configuration requirements. The main part can be Universal, so the valve with this structure has...

AI Technical Summary

Problems solved by technology

[0006] For the valve core part of this structure, since the valve core is directly pressed to the valve core seat by the spring, the coaxiality of the valve core and the valve port on the valve core seat cannot be guaranteed, and the spring support seat as a butterfly retaining ring is called a cold stamping part. , the poor parallelism between the upper end surface and the supporting part can cause the force of the spring on the valve core to deviate from the axial direction, and these factors will affect the adjustment accuracy of the valve and the sealing performance when it is closed

At the same time, in order to install the spring support seat, it is necessary to use a boring tool to process shrinkage steps in the chamber of the valve core seat, which will cause a problem that the processing of the valve core seat is difficult

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