Valve device

Abstract

The valve device comprises a fixed valve plate, a movable valve plate and a driving part, the fixed valve plate comprises a flow channel opening, the movable valve plate is driven by the driving part to adjust the opening degree of the flow channel opening, a first protrusion is arranged on the side, close to the movable valve plate, of the fixed valve plate, and a first contact face is formed at the abutting position of the first protrusion and the movable valve plate; and on at least one position where the movable valve plate rotates relative to the fixed valve plate, the first contact surface surrounds and seals the opening of the runner opening. According to the valve device, the opening degree of the flow channel opening is adjusted through relative rotation of the movable valve plate and the fixed valve plate, the protruding structures are arranged on the fixed valve plate and / or the movable valve plate, the contact area of the fixed valve plate and the movable valve plate is effectively reduced, friction is reduced, the service life of equipment is prolonged, the good sealing effect can still be kept under the condition of the small contact area, and the service life of the equipment is prolonged. Quick opening and closing response of the valve are ensured, accurate control over the fluid flow is achieved, and the pressure resistance is improved.

Description

Technical Field

[0001] The utility model relates to the field of fluid control, in particular to a valve device. Background Art

[0002] In fluid control devices, electronic expansion valves require precise flow regulation to control the refrigerant supply. Existing expansion valves typically utilize a conical needle structure, which increases or decreases the flow rate by controlling a stepper motor to drive the upward and downward displacement of the conical needle. While this structure can meet regulation requirements to a certain extent, it still has several limitations: the conical needle structure has a short stroke, resulting in a limited adjustment range for the valve; the structure has a slow response speed, making it difficult to meet rapid adjustment requirements; under high pressure conditions, the conical needle structure's pressure resistance is insufficient, easily leading to valve seal failure or even damage; and it also faces problems such as valve needle wear. Therefore, the prior art urgently needs a fluid control device that can achieve a larger adjustment range and higher pressure resistance while ensuring sealing and reducing wear. Summary of the Invention

[0003] In order to solve the problem of how to ensure the sealing and wear of the expansion valve in the prior art, the purpose of the present utility model is to provide a valve device that can rotate more smoothly and significantly reduce wear while maintaining sealing.

[0004] To achieve the above-mentioned purpose of the utility model, one embodiment of the utility model provides a valve device, including a fixed valve plate, a movable valve plate and a driving portion, wherein the fixed valve plate includes a flow passage, and the movable valve plate adjusts the opening of the flow passage under the drive of the driving portion, and a first protrusion is provided on a side of the fixed valve plate close to the movable valve plate, wherein the first protrusion forms a first contact surface at abutting position with the movable valve plate;

[0005] And / or, a second protrusion is provided on a side of the movable valve plate close to the fixed valve plate, and the second protrusion forms a second contact surface with the fixed valve plate at abutting position;

[0006] Wherein, at at least one position where the movable valve plate rotates relative to the fixed valve plate, the first contact surface and / or the second contact surface surrounds and seals the opening of the flow channel.

[0007] As a further improvement of the present invention, the fixed valve plate includes a valve plate body, and a support protrusion is further provided on the side of the fixed valve plate close to the movable valve plate. The first protrusion and the support protrusion are both higher than the valve plate body. The support protrusion extends along the moving direction of the movable valve plate, and the movable valve plate is always in contact with the support protrusion during the movement process.

[0008] As a further improvement of the present invention, the valve device further comprises a seat body, wherein the seat body and the fixed valve plate enclose an accommodating space, and the driving unit drives the movable valve plate to rotate around the rotation axis in the accommodating space;

[0009] The supporting protrusion includes an outer ring protrusion and an inner ring protrusion extending along the rotation direction of the movable valve plate. The side of the movable valve plate away from the rotation axis is abutted against the outer ring protrusion, and the side of the movable valve plate close to the rotation axis is abutted against the inner ring protrusion. The bottom surface of the movable valve plate is suspended above the valve plate body between the outer ring protrusion and the inner ring protrusion.

[0010] As a further improvement of the present invention, the valve device includes a closing stopper and an opening stopper provided in the accommodating space, and the driving portion includes a limiting portion, and the limiting portion rotates between the closing stopper and the opening stopper;

[0011] When the limiting portion abuts against the closing stop portion, the flow channel opening is closed;

[0012] When the limiting portion abuts against the opening stop portion, the opening of the flow channel opening reaches a maximum state.

[0013] As a further improvement of the present invention, the movable valve plate includes a throttle slit and a groove body, the throttle slit extends along the rotation direction of the movable valve plate, the throttle slit cooperates with the flow channel opening to form a throttle orifice, the movable valve plate adjusts the opening size of the throttle orifice during the rotation process, the opening area of ​​the groove body gradually decreases along the direction from the movable valve plate to the fixed valve plate, and the throttle slit is formed at the bottom of the groove body;

[0014] The cross-sectional area of ​​the flow passage is greater than the cross-sectional area of ​​the throttle slit. When the throttle passage reaches a maximum opening and the movable valve plate continues to open the flow passage, the opening of the flow passage increases.

[0015] As a further improvement of the present invention, the fixed valve plate also includes a cantilever protrusion, which is higher than the valve plate body. When the limiting portion abuts the closing stop portion, the throttling gap is aligned with the cantilever protrusion in the up and down directions, and the upper surface of the cantilever protrusion abuts against the lower surface of the movable valve plate.

[0016] As a further improvement of the present invention, the cross-section of the flow port is fan-shaped. When the throttle port reaches the maximum opening, one side of the movable valve plate is aligned with the straight edge on one side of the flow port. When the flow port reaches the maximum opening, one side of the movable valve plate is aligned with the straight edge on the other side of the flow port.

[0017] As a further improvement of the present invention, the driving portion further comprises a driving shaft and a driving rod, the driving rod and the limiting portion are both fixedly connected to the driving shaft, and the driving rod and the limiting portion extend in opposite directions along the same axis;

[0018] The movable valve plate includes a first wall and a second wall. A fixing groove is defined between the first wall and the second wall, and the driving rod is inserted into the fixing groove.

[0019] As a further improvement of the present invention, the distance between the first wall and the second wall gradually decreases along the direction of the driving rod away from the driving shaft until the first wall and the second wall both abut against the driving rod.

[0020] As a further improvement of the present invention, the drive shaft is further provided with a protrusion, and an elastic member is provided between the protrusion and the movable valve plate. The protrusion presses the elastic member so that the elastic member applies a force to the movable valve plate toward the fixed valve plate.

[0021] As a further improvement of the present invention, a limiting hole is provided on the valve plate body, and the seat body includes a limiting shaft, which is inserted into the limiting hole to limit the movement of the fixed valve plate. The limiting hole is a waist-shaped hole extending in a direction away from the rotation axis.

[0022] Compared with commonly used technologies, the utility model has the following beneficial effects: the valve device adjusts the opening of the flow channel through the relative rotation of the movable valve plate and the fixed valve plate, and a protrusion structure is provided on the fixed valve plate and / or the movable valve plate, which effectively reduces the contact area between the fixed valve plate and the movable valve plate, reduces friction, and extends the service life of the equipment. It can also maintain a good sealing effect under conditions of a small contact area, ensure the rapid opening and closing response of the valve, realize precise control of the fluid flow, and improve the pressure resistance performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a valve device according to an embodiment of the present invention;

[0024] Figure 2 This is a partial structural diagram of a valve device according to an embodiment of the present invention;

[0025] Figure 3 This is a structural diagram of the seat body and the driving part of an embodiment of the utility model;

[0026] Figure 4 This is a schematic structural diagram of a fixed valve plate from an upper perspective according to an embodiment of the present invention;

[0027] Figure 5 This is a structural schematic diagram of a fixed valve plate from a bottom perspective according to an embodiment of the present invention;

[0028] Figure 6 This is a structural diagram of a movable valve plate according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic structural diagram of a drive shaft according to an embodiment of the present invention;

[0030] Figure 8 This is a cross-sectional view of a valve device according to an embodiment of the present invention when closed;

[0031] Figure 9 It is a cross-sectional view of a partially opened throttle port of a valve device according to one embodiment of the present invention;

[0032] Figure 10 This is a cross-sectional view of a valve device according to an embodiment of the present invention with all throttle ports opened;

[0033] Figure 11 This is a cross-sectional view of a valve device according to an embodiment of the present invention with all flow passage openings opened;

[0034] Among them, 100, valve device; 10, fixed valve plate; 11, flow channel; 12, valve plate body; 13, support protrusion; 131, inner ring protrusion; 132, outer ring protrusion; 14, first protrusion; 15, cantilever protrusion; 16, shaft hole; 17, limit hole; 18, reinforcing rib; 20, movable valve plate; 21, throttle gap; 211, throttle port; 22, first wall; 23, second wall; 24, fixing groove; 25, shaft through hole; 3 0. Driving part; 301. Rotation axis; 302. Rotation direction; 31. Driving assembly; 32. Driving shaft; 321. Protrusion; 322. Insertion hole; 33. Limiting part; 34. Driving rod; 40. Seat; 401. Accommodating space; 41. Closing stopper; 42. Opening stopper; 43. Limiting shaft; 44. Liquid inlet; 50. Valve seat; 51. Inlet; 52. Outlet; 60. Elastic member; 70. Bearing. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0036] It should be understood that the terms used herein, such as "upper," "above," "lower," and "below," etc., indicating spatial relative positions, are used for ease of explanation to describe the relationship of one element or feature relative to another element or feature as shown in the accompanying drawings. Spatially relative terms may be intended to encompass different orientations of the device in use or operation other than the orientation shown in the drawings.

[0037] An embodiment of the present invention provides a valve device 100 that rotates more smoothly and significantly reduces wear while maintaining sealing performance. The valve device 100 has a longer service life.

[0038] The valve device 100 of this embodiment is as follows Figure 1 and 2 As shown, it includes a fixed valve plate 10, a movable valve plate 20, a driving part 30 and a driving assembly 31. The fixed valve plate 10 includes a flow channel opening 11. The driving assembly 31 drives the movable valve plate 20 to rotate through the driving part 30, thereby adjusting the opening of the flow channel opening 11.

[0039] In this embodiment, by providing a protrusion, the movable valve plate 20 and the fixed valve plate 10 only contact at the protrusion, thereby reducing the contact area and significantly reducing friction. The protrusion can be provided in the following ways:

[0040] In one embodiment, a first protrusion 14 is provided on one side of the fixed valve plate 10 close to the movable valve plate 20, and the first protrusion 14 forms a first contact surface at the abutment position with the movable valve plate 20, so that at at least one position where the movable valve plate 20 rotates relative to the fixed valve plate 10, the first contact surface surrounds and seals the opening of the flow channel 11.

[0041] In another embodiment, a second protrusion is provided on the side of the movable valve plate 20 close to the fixed valve plate 10, and the second protrusion forms a second contact surface at the abutment position with the fixed valve plate 10, so that at at least one position where the movable valve plate 20 rotates relative to the fixed valve plate 10, the second contact surface surrounds and seals the opening of the flow channel 11.

[0042] In another embodiment, a first protrusion 14 is provided on the side of the fixed valve plate 10 close to the movable valve plate 20, and the first protrusion 14 forms a first contact surface at the abutting position of the movable valve plate 20. A second protrusion is provided on the side of the movable valve plate 20 close to the fixed valve plate 10, and the second protrusion forms a second contact surface at the abutting position of the fixed valve plate 10, so that at at least one position where the movable valve plate 20 rotates relative to the fixed valve plate 10, the first contact surface and the second contact surface both surround and seal the opening of the flow channel 11.

[0043] The first protrusion 14 and / or the second protrusion are local protrusions relative to the movable valve plate 20 and the fixed valve plate 10 body, so that the contact between the movable valve plate 20 and the fixed valve plate 10 is concentrated on the protrusion surface area rather than the large area contact of the body. The design of the first protrusion 14 and / or the second protrusion surrounding the flow channel opening 11 has a structure similar to that of a gasket, which surrounds the flow channel opening 11. The first contact surface and / or the second contact surface is the surface of the gasket.

[0044] In this embodiment, the first contact surface and / or the second contact surface surround and seal the opening of the flow channel opening 11, meaning that a closed annular sealing area is formed around the flow channel opening 11. The top surfaces of the first protrusion 14 and / or the second protrusion serve as sealing contact surfaces, forming a sealing band surrounding the opening of the flow channel opening 11. The first contact surface and / or the second contact surface form a closed contact structure around the flow channel opening 11, ensuring that refrigerant cannot leak from the contact surfaces between the movable valve plate 20 and the fixed valve plate 10.

[0045] In addition, at at least one position where the movable valve plate 20 rotates, the first contact surface and / or the second contact surface surround and seal the flow channel opening 11. This also means that when the movable valve plate 20 rotates to other positions where a closed annular sealing area cannot be formed, such as partially opening the flow channel opening 11, the first contact surface and / or the second contact surface can form a dynamic sealing effect.

[0046] Therefore, the design of the first contact surface and / or the second contact surface surrounding and sealing the opening of the flow channel 11 not only improves the sealing performance, but also significantly reduces friction in the structure, optimizes the durability and working efficiency of the valve device, achieves a dynamic sealing effect, and provides a more stable and efficient operation guarantee for the valve device 100.

[0047] Taking the first contact surface surrounding and sealing the opening of the flow channel opening 11 as an example, the first protrusion 14 on the fixed valve plate 10 abuts against the movable valve plate 20, and the movable valve plate 20 and the first protrusion 14 surround and seal the opening of the flow channel opening 11, ensuring that the refrigerant cannot flow out from between the movable valve plate 20 and the first protrusion 14, and can only flow out when the movable valve plate 20 rotates to expose the flow channel opening 11.

[0048] The provision of the first protrusion 14 and / or the second protrusion allows the movable valve plate 20 and the fixed valve plate 10 to contact only at the local protrusions, reducing friction during relative rotation. The valve device 100 can achieve smoother rotation while maintaining necessary sealing, thereby extending component life.

[0049] Hereinafter, further description will be given by taking the example of providing only the first protrusion 14 and forming only the first contact surface. The implementation of providing the second protrusion can refer to the structural adjustment of the first protrusion 14.

[0050] In order to clearly express the position and direction described in this embodiment, in this embodiment, the movable valve plate 20 is defined to rotate in a horizontal plane, and the refrigerant flows in a top-down direction when passing through the flow channel opening 11. The horizontal plane is only a name definition and is not limited to the "horizontal" in the physical sense. Of course, in the preferred embodiment, the horizontal plane is correspondingly parallel to the horizontal plane in physics, and the top-down direction is the direction of gravity.

[0051] like Figures 1 to 3As shown, the valve device 100 also includes a seat body 40, and the seat body 40 and the fixed valve plate 10 enclose an accommodating space 401. The driving part 30 drives the movable valve plate 20 to rotate around the rotation axis 301 in the accommodating space 401. The accommodating space 401 is roughly cylindrical, and the rotation axis 301 can be located at the center of the accommodating space 401. A part of the driving part 30 extends out of the accommodating space 401 and is connected to the driving component 31, and a part extends into the accommodating space 401 to drive the movable valve plate 20 to rotate.

[0052] like Figure 1 As shown, the valve device 100 further includes a valve seat 50, within which the seat body 40 is accommodated. The valve seat 50 is provided with an inlet 51 and an outlet 52. The seat body 40 is provided with a liquid inlet 44. Refrigerant flowing in from the inlet 51 enters the accommodating space 401 through the liquid inlet 44, then flows downward through the flow channel opening 11 and out of the outlet 52. Furthermore, the seat body 40 may be provided with multiple liquid inlets 44 arranged around the rotation axis 301.

[0053] like Figure 4 As shown, the fixed valve plate 10 includes a valve plate body 12, and a support protrusion 13 is also provided on the side of the fixed valve plate 10 close to the movable valve plate 20. The first protrusion 14 and the support protrusion 13 are both higher than the valve plate body 12. The support protrusion 13 extends along the moving direction of the movable valve plate 20, and the movable valve plate 20 is always in contact with the support protrusion 13 during the movement process.

[0054] The support protrusion 13 provides support for the rotation of the movable valve plate 20 , so that when the movable valve plate 20 rotates in the area outside the first protrusion 14 , the contact area can be reduced to effectively reduce friction and avoid contact with the valve plate body 12 .

[0055] Specifically, the support protrusion 13 includes an outer ring protrusion 132 and an inner ring protrusion 131 extending along the rotation direction 302 of the movable valve plate 20. The side of the movable valve plate 20 away from the rotation axis 301 is abutted against the outer ring protrusion 132, and the side of the movable valve plate 20 close to the rotation axis 301 is abutted against the inner ring protrusion 131. The bottom surface of the movable valve plate 20 is suspended above the valve plate body 12 between the outer ring protrusion 132 and the inner ring protrusion 131.

[0056] In this embodiment, Figure 4 As shown, the outer ring protrusion 132 forms a complete arc along the outer side, while the inner ring protrusion 131 forms a complete arc along the inner side. Alternatively, the arc length can be determined based on the stroke length of the movable valve plate 20. The outer ring protrusion 132 extends radially to the outer edge, while the inner ring protrusion 131 extends radially to the edge of the internal shaft hole 16.

[0057] The double-sided positioning of the movable valve plate 20 and the outer ring protrusion 132 and the inner ring protrusion 131 allows the bottom surface of the movable valve plate 20 located above the valve plate body 12 to be suspended in the air, reducing the contact area and friction while providing a firm and uniform support effect, thereby achieving a smoother rotation around the rotation axis 301.

[0058] At the same time, the elevation of the outer ring protrusion 132, the inner ring protrusion 131, and the first protrusion 14 relative to the valve plate body 12 creates a groove in the valve plate body 12. This groove not only reduces the contact area with the movable valve plate 20 as described above, but also serves as a debris trap. It is understood that when impurities and debris in the fluid cannot be discharged, the debris will be trapped in the groove due to the influence of fluid flow and gravity. Without this debris trap, debris could enter the contact surface between the movable valve plate 20 and the fixed valve plate 10, affecting the sealing effect of the contact surface.

[0059] like Figure 5 As shown, a reinforcing rib 18 can be provided at the bottom of the fixed valve plate 10. The reinforcing rib 18 improves the structural strength of the fixed valve plate 10 and reduces its deformation when subjected to pressure, thereby avoiding sealing failure between the movable valve plate 20 and the fixed valve plate 10 and refrigerant leakage. Figure 5 The ribs 18 may be in the shape of spokes, crosses, grids or other regular patterns.

[0060] Continue as Figure 3 As shown, the valve device 100 includes a closing stopper 41 and an opening stopper 42 disposed within the accommodating space 401. The driving unit 30 includes a limiting portion 33, which rotates between the closing stopper 41 and the opening stopper 42. The closing stopper 41 and the opening stopper 42 limit the movement range of the limiting portion 33, thereby achieving more precise control of the opening of the flow channel 11. When the limiting portion 33 abuts the closing stopper 41, the flow channel 11 is completely closed, preventing leakage. When the limiting portion 33 abuts the opening stopper 42, the flow channel 11 reaches its maximum opening. This prevents excessive displacement of the movable valve plate 20 during opening or closing, prevents leakage caused by the movable valve plate 20 not moving properly during closing, and avoids flow errors and the accumulation of errors caused by improper opening control. The function of the limiting portion 33 improves the operational safety and stability of the valve.

[0061] Furthermore, if Figure 6 As shown, the movable valve plate 20 includes a throttling slit 21 and a groove body. The throttling slit 21 extends along the rotation direction 302 of the movable valve plate 20. The throttling slit 21 cooperates with the flow channel opening 11 to form a throttling port 211. The movable valve plate 20 adjusts the opening size of the throttling port 211 during the rotation process. The opening area of ​​the groove body gradually decreases from the movable valve plate 20 to the fixed valve plate 10. The throttling slit 21 is formed at the bottom of the groove body.

[0062] The valve device 100 of this embodiment can be an electronic expansion valve. When the refrigerant passes through the throttle port 211, the high-pressure refrigerant is reduced to a low-pressure refrigerant through the narrow throttle slit 21, and part of the refrigerant expands from liquid to gas. The throttle slit 21 cooperates with the flow channel 11 to accurately control the opening size of the throttle port 211. The movable valve plate 20 rotates to different positions to adjust the different lengths of the throttle port 211, thereby accurately adjusting the amount of refrigerant supplied. The throttle slit 21 extends along the rotation direction 302 of the movable valve plate 20, that is, the throttle slit 21 is in the shape of an arc with the rotation axis 301 as the center. In this way, the rotation amount of the arc-shaped throttle slit 21 is linearly related to the opening of the throttle port 211, which facilitates accurate control of the opening size.

[0063] The cross-sectional area of ​​the flow passage 11 is larger than that of the throttle slit 21. When the throttle slit 211 reaches its maximum opening and the movable valve plate 20 continues to open the flow passage 11, the opening of the flow passage 11 increases. The process of increasing the opening of the flow passage 11 occurs in two stages. In the first stage, only the slit-shaped throttle slit 211 is opened. In this stage, the valve device 100 functions as an expansion valve that performs a pressure-reducing function. In the second stage, the flow passage 11 gradually opens in a fan-shaped manner until it is fully exposed. In this stage, the valve device 100 functions as a through valve.

[0064] The second stage ensures that when a large flow is required, the flow channel 11 can quickly reach the maximum opening, and when a small flow is required, the throttle port 211 of the first stage provides a more precise control capability. In this way, the valve has more functions and can be applied to more usage scenarios. It can meet different flow requirements while improving the overall response speed and stability of the system.

[0065] Furthermore, if Figure 4 As shown, the fixed valve plate 10 further includes a cantilever protrusion 15, which is higher than the valve plate body 12. When the limit portion 33 abuts against the closing stop portion 41, the throttle gap 21 is aligned with the cantilever protrusion 15 in the vertical direction, and the upper surface of the cantilever protrusion 15 abuts against the lower surface of the movable valve plate 20, as shown in FIG. Figure 8 As shown, this can provide additional sealing support to the movable valve plate 20 in the closed state, ensuring that the flow channel 11 is completely closed and effectively avoiding leakage. On the other hand, it can avoid long-term excessive pressure, structural deformation caused by the suspension of the throttling gap 21, and sealing failure caused by deformation.

[0066] The cross section of the flow channel opening 11 is fan-shaped, as shown in FIG. Figure 10 As shown, when the throttle port 211 reaches its maximum opening, one side of the movable valve plate 20 is aligned with the straight edge of the flow channel port 11, as shown in FIG. Figure 11As shown, when the flow channel 11 reaches its maximum opening, one side of the movable valve plate 20 is aligned with the straight edge on the other side of the flow channel 11. The fan-shaped design optimizes the fluid flow path during the adjustment of the movable valve plate 20, better adapts to the dynamic adjustment during the valve opening and closing process, and facilitates the calculation and control of the current opening of the throttle port 211.

[0067] Furthermore, if Figure 3 and 8 As shown, the driving portion 30 also includes a driving shaft 32 and a driving rod 34. The driving rod 34 and the limiting portion 33 are fixedly connected to the driving shaft 32. The driving rod 34 and the limiting portion 33 extend in opposite directions along the same axis. In this way, the movement of the limiting portion 33 between the closing stop portion 41 and the opening stop portion 42 limits the movement range of the driving rod 34 in opposite positions.

[0068] The valve plate includes a first wall 22 and a second wall 23, which define a fixing groove 24. A drive rod 34 is inserted into the fixing groove 24. The drive rod 34 is inserted into the fixing groove 24 on the movable valve plate 20 and stably transmits power in the rotation direction 302, reducing displacement errors during the driving process. This stability improves the control accuracy of the movable valve plate 20, ensuring precise response to the adjustment action, and further enhancing the control accuracy of the opening of the flow channel opening 11.

[0069] Furthermore, if Figure 6 and 8 As shown, the distance between the first wall 22 and the second wall 23 gradually decreases along the driving rod 34 in a direction away from the driving shaft 32 until both the first wall 22 and the second wall 23 abut the driving rod 34. The tapered structure designed between the first wall 22 and the second wall 23 allows the driving rod 34 to fit more closely with the movable valve plate 20 during the driving process, further stabilizing the positioning of the driving rod 34, preventing loosening or displacement during rotation, and avoiding the problem of the rotation amount of the driving rod 34 being inconsistent with the rotation amount of the movable valve plate 20. This improves the response speed and control accuracy of the device, enabling precise control of the driving unit 30 at different rotation angles.

[0070] like Figure 7 As shown, a socket 322 is provided on the drive shaft 32, and the drive rod 34 and the limiting portion 33 are on the same rod, that is, the rod where the drive rod 34 and the limiting portion 33 are located passes through the socket 322 on the drive shaft 32, one side of the socket 322 is the drive rod 34, and the other side of the socket 322 is the limiting portion 33.

[0071] In addition, a convex structure can be set in the shaft through hole 25, and a structure adapted to the convex structure can be set on the drive shaft 32. The position of the convex structure and the socket 322 have a certain relationship, for example, facing the same direction, so as to avoid assembly errors during assembly.

[0072] like Figure 1 As shown, a bearing 70 is provided between the seat body 40 and the drive shaft 32. Figure 6 As shown, the movable valve plate 20 includes a shaft through hole 25. Figure 4 As shown, the fixed valve plate 10 includes a shaft hole 16 , and the drive shaft 32 rotates in the bearing 70 and passes through the shaft through hole 25 and then is inserted into the shaft hole 16 .

[0073] The drive shaft 32 is further provided with a protrusion 321. An elastic member 60 is provided between the protrusion 321 and the movable valve plate 20. The protrusion 321 presses against the elastic member 60, causing the elastic member 60 to exert a force on the movable valve plate 20 toward the fixed valve plate 10. The elastic member 60 can be configured as a compression spring, a wave spring, or a leaf spring. The downward elastic force exerted by the elastic member 60 on the movable valve plate 20 can ensure that the movable valve plate 20 is tightly pressed against the fixed valve plate 10, preventing a gap from forming between the movable valve plate 20 and the fixed valve plate 10 when the movable valve plate 20 moves in the vertical direction, and allowing the movable valve plate 20 to rotate more smoothly and tightly.

[0074] In addition, if Figure 4 and 8 As shown, a limiting hole 17 is provided on the valve plate body 12, and the seat body 40 includes a limiting shaft 43, which is inserted into the limiting hole 17 to limit the movement of the valve plate 10. The limiting hole 17 is a waist-shaped hole extending in a direction away from the rotation axis 301. Its length in the radial direction around the rotation axis 301, that is, the radial direction, is longer, and its length in the circumferential direction is shorter. In this way, when the limiting shaft 43 cooperates with the limiting hole 17, it is easy to assemble in the radial direction and accurately positioned in the circumferential direction.

[0075] The process of opening the flow channel opening 11 of the valve device 100 is described below:

[0076] like Figure 8 As shown, at the beginning, the flow channel opening 11 is in a completely closed state. Then, during the process of the driving unit 30 driving the movable valve plate 20 to move, the movable valve plate 20 rotates around the rotation axis 301, as shown in FIG. Figures 9-11 shown.

[0077] In the first stage, that is, from Figures 9 to 10 During the movement of the valve 100, only the narrow throttle opening 211 formed by the throttle slit 21 and the flow channel opening 11 is gradually opened, and the fluid (such as refrigerant) flows out through the throttle opening 211. Due to the small opening of the throttle opening 211, the high-pressure refrigerant experiences a pressure drop when flowing through the narrow throttle slit 21, thereby achieving a pressure reduction function. At this time, the valve device 100 is in the expansion valve state, and its main function is to accurately control the flow rate of the refrigerant. By slightly changing the opening, it can meet the demand for precise flow regulation under low flow conditions.

[0078] When the movable valve plate 20 continues to rotate, the throttle port 211 gradually expands, and the fluid flow rate reaches the upper limit of the expansion valve function, such as Figure 10 Then the movable valve plate 20 begins to further expose the opening edge of the flow channel opening 11.

[0079] Entering the second stage, Figures 10 to 11 During the movement, as the movable valve plate 20 continues to rotate, the fan-shaped opening of the flow port 11 is gradually exposed. At this time, the opening of the flow port 11 transitions from the narrow state of the throttle port 211 to a wider range of open state, the flow path of the fluid is significantly expanded, and the valve device 100 gradually transitions from the expansion valve mode to the straight-through valve mode. At this stage, the valve device 100 meets the system's demand for high flow by significantly increasing the opening of the flow port 11. Finally, the flow port 11 is completely exposed, and the edge of the movable valve plate 20 is precisely aligned with the straight edges on both sides of the flow port 11, achieving the maximum opening state of the valve device 100, as shown in FIG. Figure 11 shown.

[0080] The closing process of the flow channel opening 11 of the valve device 100 is a movement in the opposite direction of the above-mentioned opening process.

[0081] Through these two stages of control, the valve device 100 can not only finely adjust small flows, but also quickly switch to an operating mode that satisfies large flows, thereby improving the response speed and operating efficiency of the system.

[0082] Compared with the prior art, this embodiment has the following beneficial effects:

[0083] The valve device 100 adjusts the opening of the flow channel 11 by the relative rotation of the movable valve plate 20 and the fixed valve plate 10, and provides a raised structure on the fixed valve plate 10 and / or the movable valve plate 20, which effectively reduces the contact area between the fixed valve plate and the movable valve plate, reduces friction, and extends the service life of the equipment. It can also maintain a good sealing effect under the condition of a small contact area, ensure the rapid opening and closing response of the valve, realize precise control of the fluid flow, and improve the pressure resistance performance.

[0084] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0085] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A valve device (100), comprising a fixed valve plate (10), a movable valve plate (20) and a driving unit (30), wherein the fixed valve plate (10) comprises a flow passage (11), and the movable valve plate (20) is driven by the driving unit (30) to adjust the opening of the flow passage (11), characterized in that: A first protrusion (14) is provided on one side of the fixed valve plate (10) close to the movable valve plate (20), and a first contact surface is formed at abutting position between the first protrusion (14) and the movable valve plate (20); And / or, a second protrusion is provided on a side of the movable valve plate (20) close to the fixed valve plate (10), and a second contact surface is formed at a position where the second protrusion abuts against the fixed valve plate (10); Wherein, at at least one position where the movable valve plate (20) rotates relative to the fixed valve plate (10), the first contact surface and / or the second contact surface surrounds and seals the opening of the flow channel (11).

2. The valve device (100) according to claim 1, characterized in that The fixed valve plate (10) includes a valve plate body (12), and a support protrusion (13) is further provided on the side of the fixed valve plate (10) close to the movable valve plate (20). The first protrusion (14) and the support protrusion (13) are both higher than the valve plate body (12). The support protrusion (13) extends along the moving direction of the movable valve plate (20), and the movable valve plate (20) always abuts against the support protrusion (13) during the movement process.

3. The valve device (100) according to claim 2, characterized in that The valve device (100) further comprises a seat body (40), wherein the seat body (40) and the fixed valve plate (10) enclose an accommodating space (401), and the driving portion (30) drives the movable valve plate (20) to rotate around a rotation axis (301) in the accommodating space (401); The supporting protrusion (13) includes an outer ring protrusion (132) and an inner ring protrusion (131) extending along the rotation direction (302) of the movable valve plate (20), the side of the movable valve plate (20) away from the rotation axis (301) is abutted against the outer ring protrusion (132), and the side of the movable valve plate (20) close to the rotation axis (301) is abutted against the inner ring protrusion (131), and the bottom surface of the movable valve plate (20) is suspended above the valve plate body (12) between the outer ring protrusion (132) and the inner ring protrusion (131).

4. The valve device (100) according to claim 3, characterized in that The valve device (100) comprises a closing stopper (41) and an opening stopper (42) arranged in the accommodating space (401); the driving portion (30) comprises a limiting portion (33); and the limiting portion (33) rotates between the closing stopper (41) and the opening stopper (42); When the limiting portion (33) abuts against the closing stop portion (41), the flow channel opening (11) is closed; When the limiting portion (33) abuts against the opening stop portion (42), the opening of the flow channel opening (11) reaches a maximum state.

5. The valve device (100) according to claim 4, characterized in that The movable valve plate (20) includes a throttling slit (21) and a groove body, wherein the throttling slit (21) extends along the rotation direction (302) of the movable valve plate (20), and the throttling slit (21) cooperates with the flow channel opening (11) to form a throttling port (211). The movable valve plate (20) adjusts the opening size of the throttling port (211) during the rotation process, and the opening area of ​​the groove body gradually decreases along the direction from the movable valve plate (20) to the fixed valve plate (10), and the throttling slit (21) is formed at the bottom of the groove body; The cross-sectional area of ​​the flow channel opening (11) is greater than the cross-sectional area of ​​the throttling slit (21). When the throttling opening (211) reaches a maximum opening and the movable valve plate (20) continues to open the flow channel opening (11), the opening of the flow channel opening (11) increases.

6. The valve device (100) according to claim 5, characterized in that The fixed valve plate (10) further includes a cantilever protrusion (15), which is higher than the valve plate body (12). When the limiting portion (33) abuts against the closing stop portion (41), the throttling gap (21) is aligned with the cantilever protrusion (15) in the up-down direction, and the upper surface of the cantilever protrusion (15) abuts against the lower surface of the movable valve plate (20).

7. The valve device (100) according to claim 5, characterized in that The cross section of the flow channel opening (11) is fan-shaped. When the throttle opening (211) reaches the maximum opening, one side of the movable valve plate (20) is aligned with the straight edge on one side of the flow channel opening (11). When the flow channel opening (11) reaches the maximum opening, one side of the movable valve plate (20) is aligned with the straight edge on the other side of the flow channel opening (11).

8. The valve device (100) according to claim 4, characterized in that The driving portion (30) further comprises a driving shaft (32) and a driving rod (34), wherein the driving rod (34) and the limiting portion (33) are both fixedly connected to the driving shaft (32), and the driving rod (34) and the limiting portion (33) extend in opposite directions along the same axis. The movable valve plate (20) comprises a first wall (22) and a second wall (23), a fixing groove (24) is defined between the first wall (22) and the second wall (23), and the driving rod (34) is inserted into the fixing groove (24).

9. The valve device (100) according to claim 8, characterized in that Along the direction of the driving rod (34) away from the driving shaft (32), the distance between the first wall (22) and the second wall (23) gradually decreases until both the first wall (22) and the second wall (23) abut against the driving rod (34).

10. The valve device (100) according to claim 8, characterized in that The drive shaft (32) is further provided with a protrusion (321), and an elastic member (60) is provided between the protrusion (321) and the movable valve plate (20). The protrusion (321) presses against the elastic member (60), so that the elastic member (60) applies a force to the movable valve plate (20) in the direction toward the fixed valve plate (10).

11. The valve device (100) according to claim 3, characterized in that A limiting hole (17) is provided on the valve plate body (12), and the seat body (40) includes a limiting shaft (43), which is inserted into the limiting hole (17) to limit the movement of the fixed valve plate (10), and the limiting hole (17) is a waist-shaped hole extending in a direction away from the rotation axis (301).

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