Proportional valve and its seat

Abstract

The invention relates to the field of valves, in particular to a proportional valve and a valve seat thereof. The proportional valve comprises a valve body, a valve core and the valve seat, wherein the valve core is in sliding fit with the valve seat; a valve port is formed in the valve seat, and the valve core can open and close the valve port and adjust the opening degree of the valve port through reciprocating movement; and when the valve port works, the firstly opened end of the valve port is defined as a primary open end, the valve port is provided with a gradually-changed section, the gradually-changed section is gradually enlarged from the primary open end of the valve port to the other end of the valve port, and the inner wall surface of at least one side of the gradually-changed section is an arc surface extending from the primary open end of the valve port to the outer side. According to the proportional valve, sudden change of the change speed of the opening degree of the valve port is prevented in any situation so that flow control precision of the proportional valve can be improved.

Description

technical field [0001] The invention relates to the field of valves, in particular to a proportional valve and its valve seat. Background technique [0002] Proportional valve is a valve that can continuously control the flow of the corresponding medium. It is widely used in various fields such as gas appliances, vehicles, and medical equipment. For example, in gas appliances, the proportional valve is the core control component. Through the pressure regulation and voltage stabilization functions of the gas proportional valve, the output pressure can be stabilized when the gas inlet pressure fluctuates. At the same time, the gas proportional valve also has the function of opening and closing the gas pipeline. When the gas appliance is closed, it can disconnect the gas channel, prevent the flow and leakage of the gas, and protect the personal safety of the user. [0003] A typical proportional valve includes a valve body, a valve core, a spring and an electromagnetic drive a...

AI Technical Summary

Problems solved by technology

In practical applications, the triangular opening structure does improve the flow control accuracy of the proportional valve to a certain extent, but due to the solenoid valve structure, the movement of the valve core is simultaneously affected by the force of the electromagnetic drive part and the return spring, while the force of the spring The relationship between the change of the role of the proportional valve and its compression is not linear, so when the proportional valve is working, especially in the early stage of the spool action, there will be relatively serious flow fluctuations. In this case, even if the valve port is designed as a triangle , in some occasions that require high flow control accuracy, it still cannot meet the requirements

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