Direct-acting type electric valve

Abstract

The invention discloses a direct-acting type electric valve. The direct-acting type electric valve comprises a valve seat with a valve cavity, a motor and a lead screw, wherein the motor and the lead screw are mounted at the upper end of the valve seat. The lead screw is connected with a nut in a thread fit manner, and the nut is connected with a valve element; a rotor of the motor and the axial position of the valve seat are relatively fixed, and the upper end of the lead screw is fixedly connected with the rotor; the valve element is driven by the nut to move in the axial direction of the valve cavity to open or close a valve opening in the valve seat; the valve element is of cylindrical structure with a balance channel, and a sealing part for dividing the valve cavity into two independent cavity bodies is arranged on the periphery of the valve element. According to the structure, a gear system is eliminated, and unnecessary transmission is reduced; and friction losses are reduced, and the response is direct, reliable and sensitive. The rotor and the axial position of the valve seat are fixed, that is, in the working process, the opposite positions of the rotor and the coil component are fixed, so that driving force is stable; obviously, for the valve opening of the same size, the size of the motor in the scheme is smaller than that of a motor in the prior art, and the miniaturization large-capacity requirements can be met.

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] For commercial air conditioners such as multi-split or modular units, one outdoor unit is connected to multiple indoor unit systems. A flow control valve needs to be installed on the refrigerant circuit of each indoor unit to cut off the refrigerant or adjust the flow. The requirement for this flow control valve is to be able to adjust the flow at any opening degree and to operate stably, and because it needs to be installed on the refrigerant circuit of each indoor unit, it is also necessary for the flow control valve to meet the requirements of miniaturization and large capacity. [0003] At present, the flow control valve mostly adopts a pilot-operated control valve, which uses a motor to drive a pilot valve core, and the main valve core and the pilot valve core open and close the main valve port in...

AI Technical Summary

Problems solved by technology

However, when this type of direct-acting control valve is working, the axial center position of the rotor and the coil part changes due to the axial movement of the rotor, which cannot always maintain the axial center position of the coil part, thereby reducing the driving force. To close the valve port with larger diameter, it is also necessary to increase the size of the motor

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