Switching valve and pilot-operated directional valve with the switching valve

Abstract

The invention discloses a switching valve and a pilot type switching valve provided with the same. The switching valve comprises a valve body with a valve cavity, a valve seat arranged in the valve cavity, a slide block arranged on the valve seat and a valve iron assembly arranged at one side of the slide block, and further comprises a valve needle rod and a drive part, wherein the slide block is used for dividing the valve cavity into an inside chamber and an outside chamber; and a balancing hole for communicating the inside chamber with the outside chamber is formed in the slide block. Under a normal state, the balancing hole is closed by the valve needle rod; and when the core iron assembly drives the slide block to move and reverse, the drive part drives the valve needle rod to act to open the balancing hole. Through the structural design of the switching valve, when the hole diameter of a valve hole is increased, reliable reversing can be realized without regulating an electromagnetic soil, so that increase of product size and weight when the hole diameter of the valve hole is increased is avoided.

Description

technical field [0001] The invention relates to the technical field of refrigeration control, in particular to a switching valve and a pilot-operated reversing valve with the switching valve. Background technique [0002] The switching of the refrigerant flow direction of various refrigeration and heating equipment (such as air conditioners, refrigerators, etc.) is completed through the reversing valve. [0003] The reversing valve used in this type of refrigeration system mostly adopts a pilot-operated reversing valve, which usually includes a main valve and a pilot valve. The change of the outflow direction guides the change of the flow direction of the refrigerant inside the main valve, that is, the switching of the main valve is realized through the switching of the pilot valve. [0004] Obviously, the pilot valve is the core reversing control component of the pilot-operated reversing valve, and its good working reliability is a necessary guarantee for realizing the bas...

AI Technical Summary

Problems solved by technology

[0009] The pilot valve 10 is usually only suitable for small-diameter reversing valves (the diameter of the valve port is less than 1mm). When the diameter of the reversing valve increases according to actual needs, the effective sealing area of ​​the slider 13 will also increase accordingly. Under the premise that the pressure difference remains unchanged, the frictional resistance f experienced by the slider 13 also increases correspondingly, which is very likely to cause the frictional resistance f to be greater than the electromagnetic force of the electromagnetic coil, and the switching of the pilot valve 10 cannot be realized.

[0010] In order to solve this problem, the electromagnetic force is usually increased by increasing the electromagnetic coil to ensure that the electromagnetic force is greater than the frictional resistance f of the slider 13. This will inevitably increase the weight and volume of the product, and the production cost will also increase accordingly, contrary to the miniaturization of the valve parts. , lightweight design ideas

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