Valve device

Abstract

The invention discloses a valve device which comprises a drive component and a valve body component. The valve body component is provided with two planes; each plane is provided with a valve port, andthe two valve ports communicate with two connectors separately. The valve device further comprises a sliding block component, the sliding block component comprises two sliding blocks matched with thetwo planes separately, and the two sliding blocks are each provided with a runner part and a blocking part which are arranged in the circumferential direction of respective rotation centers. The runner parts differ in circulation area in the circumferential direction. The runner parts communicate with a valve cavity of the valve body component. The valve device further comprises two elastic partswhich are matched with the two sliding blocks separately. Each elastic part has pretightening force for abutting against the corresponding plane in a pressing mode. Under driving of the drive component, the sliding blocks can be rotated relative to the corresponding planes so that the runner parts can communicate with the valve ports of the corresponding planes or the blocking parts close the valve ports of the corresponding planes. By means of the valve device, different flow control characteristics can be achieved during forward and reverse flow adjustment.

Description

technical field [0001] The invention relates to the technical field of fluid control components, in particular to a valve device for flow regulation. Background technique [0002] In refrigeration systems, electronic expansion valves are often used to control forward and reverse flow. Please refer to figure 1 , figure 1 It is a schematic cross-sectional view of an electronic expansion valve commonly used at present. [0003] When working, through the external excitation coil, the motor magnetic rotor 1' is driven to rotate, and the valve needle screw 2' is driven to rotate relative to the fixed nut 3', so as to realize the up and down movement of the valve needle 5' at the valve port 4', and through the valve needle 5' The change of the relative position between the end of the conical surface and the valve port 4' realizes the change of the flow section of this part, thereby adjusting the size of the flow. [0004] When the valve port 4' is closed, in order to prevent th...

AI Technical Summary

Problems solved by technology

[0005] After the valve port 4' and the valve needle 5' are determined, the electronic expansion valve provides basically the same control flow characteristics in the forward and reverse directions. However, in practical applications, there are cooling defrosting, cooling and heating, because the actual setting path length is different. Using the same flow control characteristics for cooling and heating can affect the performance of the system

[0006] In addition, in order to realize forward and reverse flow regulation, the pretightening force of spring 6' is usually set larger, such as 10N. When valve needle 5' fully closes valve port 4', the spring force and system pressure difference will cause valve needle 5 There is a large force between the valve port 4' and the valve needle 5'. When the valve needle 5' moves up and down to realize the opening and closing adjustment, friction will inevitably be formed between the valve port 4' and the valve needle 5', which will affect the electronic expansion. The service life and performance of the valve (for example, internal leakage will occur), and when the valve needle 5' moves, there is friction between metals in the relevant parts, which will not only produce friction noise, but also wear and tear when there is no oil lubrication, resulting in seizure , thereby affecting the normal function of the valve

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