Direct-acting electric valve

Abstract

The invention discloses a direct-acting electric valve comprising a valve seat having a valve cavity and a valve core disposed in the valve seat. The valve cavity is divided into an upper cavity and a lower cavity by the valve core; the valve core is connected with a nut; the valve core driven by the nut can axially move to be arranged on a valve port of the valve seat in an opening or a close way; the nut is formed by a small diameter part and a large diameter part arranged on the lower end of the small diameter part; at least one through groove communicated with the upper cavity is formed on the peripheral wall of the large diameter part; the valve core is provided with an accommodating cavity accommodating the large diameter part and an axial through hole communicated with the accommodating cavity; the axial through hole is communicated with the valve port; the periphery of the large diameter part is provided with an opening to be communicated with the axial through hole and the through groove; therefore, when air pressure of the valve port is higher or lower than the upper cavity, air pressure balance can be achieved via a flow channel formed by the axial through hole of the valve core, the opening of the large diameter part of the nut and the through groove; the valve core can be prevented from upward or downward pushing force; and impact to the valve core or impedance to the action of the valve core can be prevented.

Description

technical field [0001] The invention relates to the technical field of fluid control components, in particular to a direct-acting electric valve. Background technique [0002] In air conditioners, refrigerators, heat pump water heaters and various refrigeration and heating equipment, or other occasions that need to regulate fluid flow, flow regulating valves are usually used, and direct-acting electric valves are one of the flow regulating valves. [0003] A common direct-acting electric valve at present can realize two-way flow, including a valve seat with a valve cavity and a valve seat core inside the valve seat. The valve cavity is divided into a core cavity and a surrounding valve core by the valve seat core. The lower compartment of the core chamber, the peripheral wall of the valve seat core is provided with a flow regulating groove; the bottom of the valve seat is provided with a valve port communicating with the core chamber, and is connected with a vertical pipe co...

AI Technical Summary

Problems solved by technology

[0007] Because the direct-acting electric valve can realize two-way flow, when the valve port is closed and there is still high-pressure refrigerant in the vertical pipe, the valve port is in a high-pressure area, and the upper chamber is in a low-pressure area, so there is a pressure difference between the upper and lower ends of the valve core. The air pressure difference forms an upward thrust, pushing the valve core to move, resulting in poor sealing of the valve port, and even impacting the nut screw connected to the valve core

Moreover, the upper chamber is a sealed chamber. When the valve port is opened, the valve core moves upward, and the air pressure in the upper chamber will gradually increase due to the volume reduction, which will generate a downward thrust on the valve core and hinder the movement of the valve core.

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