Valve device

Abstract

The invention discloses a valve device, which includes a driving part and a valve body part. The valve body part has two planes, and each of the planes is provided with a valve port, and the two valve ports are respectively connected to two interfaces; A block part, which includes two sliders that are respectively matched with the two planes, and the two sliders all have a flow channel portion and a blocking portion that are circumferentially arranged around their respective rotation centers; along the circumferential direction, the flow channel portion The flow area is different; the flow channel part communicates with the valve cavity of the valve body part; it also includes two elastic parts, which are respectively matched with the two sliders; the elastic parts have the function of pressing the slider against the The pretightening force of the plane; driven by the driving component, the slider can rotate relative to the corresponding plane, so that its flow channel part communicates with the valve port of the corresponding plane, or makes the Its blocking portion closes the corresponding valve port on the plane. The valve device has different flow control characteristics when it can realize forward and reverse flow regulation.

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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