shutoff valve

Abstract

The application relates to a stop valve, which comprises a valve body assembly, a valve core assembly and a fixed sheet. The valve body assembly is provided with a first opening, the fixed sheet is fixedly arranged at the first opening, and the fixed sheet is provided with a first flow channel communicated with the first opening. The first flow channel comprises multiple sub-flow channels arranged along the circumference of the fixed sheet and communicated with each other. The valve core assembly comprises a rotating sheet, the rotating sheet is provided with an open slot, and the rotating sheet abuts against the fixed sheet along the axial direction of the valve core assembly. The non-opening area of the rotating sheet blocks the first flow channel when the stop valve is in a closed valve state. When the stop valve is in an open valve state, the open slot and at least part of the first flow channel form an overlapping area along the axial direction of the valve core assembly, the overlapping area is used for fluid passing, and the flow area change rates of the overlapping area at the multiple sub-flow channels are different. The stop valve provided by the application controls the flow in stages, and the accuracy of the flow control is improved.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a gate valve. Background Technology

[0002] Gate valves are widely used in air conditioning system piping to control the opening and closing of pipes. A gate valve typically consists of a valve body and a valve core. The valve body has a valve port. In conventional gate valves, the valve core and valve body are connected by threads. When the gate valve needs to be opened or closed, the valve core needs to be rotated multiple times to move axially to the position that seals or opens the valve port. This process is slow and inefficient.

[0003] To improve the switching efficiency of gate valves, the relevant structures typically employ a fixed plate and a rotating plate within the valve body. The fixed plate is located at the port and has a through hole connecting to the valve port. The rotating plate has a flow channel and can rotate relative to the fixed plate to block the through hole, thereby closing the gate valve, or to allow the flow channel to connect with the through hole, thereby opening the gate valve.

[0004] The through-holes on the fixed plate are typically configured as two symmetrically arranged sector-shaped slots. These slots usually have a small central angle and a large radial width. This causes the flow area between the flow channel and the through-hole to increase rapidly when the rotating plate begins to rotate from the position blocking the through-hole. Consequently, the flow rate of the shut-off valve also increases rapidly. Furthermore, only a small rotation angle is needed to completely align the sector-shaped slots with the flow channel. Therefore, this type of shut-off valve is generally suitable for rapid opening but is difficult to use for precise flow control. Utility Model Content

[0005] Therefore, it is necessary to provide a shut-off valve that can precisely control the flow rate.

[0006] A shut-off valve includes a valve body assembly, a valve core assembly, and a fixing plate. The valve body assembly has a first opening, and the fixing plate is fixedly disposed at the first opening. The fixing plate has a first flow channel communicating with the first opening, and the first flow channel includes multiple sub-flow channels arranged and communicating along the circumference of the fixing plate. The valve core assembly includes a rotating plate with an opening groove. Along the axial direction of the valve core assembly, the rotating plate abuts against the fixing plate, and the rotating plate is capable of rotating relative to the fixing plate around the axial direction of the valve core assembly, thus enabling the shut-off valve to have a closed state and an open state. When the shut-off valve is in the closed state, the non-opening area of ​​the rotating plate blocks the first flow channel. When the shut-off valve is in the open state, the opening groove and at least a portion of the first flow channel form an overlapping area along the axial direction of the valve core assembly. The overlapping area is used for fluid passage, and the rate of change of the flow area of ​​the overlapping area at the multiple sub-flow channels is different.

[0007] In one embodiment, the number of sub-channels is configured to be two, and the two sub-channels are defined as a throttling section and a fully open section, which are arranged along the circumference of the fixed plate and are interconnected.

[0008] In one embodiment, as the rotating plate rotates, the flow area of ​​the overlapping region continuously increases as the opening groove rotates from near the throttling section to near the fully open section, and the rate of change of the flow area of ​​the overlapping region at the throttling section is less than the rate of change of the flow area at the fully open section.

[0009] In one embodiment, the width of the throttling section along the radial direction of the fixed plate is smaller than the width of the fully open section along the radial direction of the fixed plate.

[0010] In one embodiment, the fully open segment is configured as a sector, rectangle, circle, square, or irregular shape;

[0011] The throttling section extends in a long strip along the circumference of the fixed plate, and the width of the throttling section is constant along the direction from the throttling section to the fully open section; or the width of the throttling section tends to decrease; or the width of the throttling section tends to increase; or the width of the throttling section tends to alternate between large and small.

[0012] In one embodiment, the outline of the throttling section includes a first arc segment and a first curved segment connected together, and along the radial direction of the fixing plate, the first arc segment is disposed closer to the outer edge of the fixing plate than the first curved segment;

[0013] The outline of the fully open section includes a second arc segment and a second curve segment. Along the radial direction of the fixing piece, the first arc segment is positioned closer to the outer edge of the fixing piece than the first curve segment.

[0014] The first and second circular arc segments are smoothly connected, and the first and second curved segments are set at an angle at the junction of the throttling section and the fully open section.

[0015] In one embodiment, along the circumference of the fixing plate, the central angle formed by the two ends of the first flow channel is α, and 0°<α≤170°.

[0016] In one embodiment, the fixing piece includes a sealing area and a connecting area adjacent to each other along its circumference. Both the sealing area and the connecting area are configured in a fan-shaped structure. A first flow channel is formed in the connecting area. The sealing area is used to cooperate with the opening slot to isolate the first flow channel from the opening slot.

[0017] In one embodiment, the opening slot is configured as a notch structure with a fan-shaped cross-section.

[0018] In one embodiment, the shut-off valve further includes a drive motor, and the valve core assembly further includes a valve stem, with one end of the valve stem connected to the drive motor and the other end connected to a rotating plate. The drive motor can drive the rotating plate to rotate through the valve stem.

[0019] Compared to existing technologies, the gate valve provided in this application, by setting the first flow channel to include multiple sub-flow channels arranged circumferentially and interconnected along the fixed plate, facilitates the overlapping area formed by the opening groove on the rotating plate and different positions of the first flow channel as the rotating plate rotates axially around the valve core assembly. Furthermore, since the rate of change of flow area is different in the overlapping areas across the multiple sub-flow channels, the flow rate of the gate valve changes relatively slowly as the rotating plate continues to rotate in the sub-flow channels with a relatively small rate of change of flow area in the overlapping areas; conversely, the flow rate of the gate valve changes relatively rapidly as the rotating plate continues to rotate in the sub-flow channels with a relatively large rate of change of flow area in the overlapping areas. Thus, by rotating the rotating plate to different sub-flow channels, the flow rate of the gate valve can be controlled in stages, thereby improving the accuracy of flow regulation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A cross-sectional view of the shut-off valve provided in this application;

[0022] Figure 2 A partial sectional view of the shut-off valve provided in this application;

[0023] Figure 3 A schematic diagram of the valve core assembly provided in this application when the first flow channel is closed;

[0024] Figure 4 A schematic diagram of the valve core assembly provided in this application when the first flow channel is open. Figure 1 ;

[0025] Figure 5 A schematic diagram of the valve core assembly provided in this application when the first flow channel is open. Figure 2 ;

[0026] Figure 6 An exploded view of the valve core assembly provided in this application;

[0027] Figure 7 for Figure 6 The flow rate curve corresponding to the fixed plate is shown below.

[0028] Figure 8 A top view of the fixing piece in one embodiment provided in this application;

[0029] Figure 9 for Figure 8 The flow rate curve corresponding to the fixed plate is shown below.

[0030] Figure 10 A top view of the fixing piece in another embodiment provided in this application;

[0031] Figure 11 for Figure 10 The flow rate curve corresponding to the fixed plate is shown below.

[0032] Figure 12 A top view of the fixing piece in yet another embodiment provided in this application;

[0033] Figure 13 for Figure 12 The flow rate curve corresponding to the fixed plate is shown.

[0034] Reference numerals: 100, gate valve; 10, valve body assembly; 101, valve cavity; 102, first opening; 103, second opening; 11, main valve body; 12, fixed seat; 130, mounting groove; 122, limiting groove; 20, valve core assembly; 201, overlapping area; 22, rotating plate; 224, mating groove; 23, valve stem; 231, mating protrusion; 230, opening groove; 30, fixed plate; 301, first flow channel; 3011, sub-flow channel; 302, throttling section; 3030, sub-throttling section; 3022, protrusion; 303, fully open section; 304, first arc segment; 305, first curved segment; 306, second arc segment; 307, second curved segment; 308, limiting protrusion; 312, sealing area; 313, connecting area; 40, drive motor; 50, connecting pipe. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0040] Please see Figures 1 to 4This application provides a shut-off valve 100, which includes a valve body assembly 10, a valve core assembly 20, and a fixing plate 30. The valve body assembly 10 has a first opening 102, and the fixing plate 30 is fixedly disposed at the first opening 102. The fixing plate 30 has a first flow channel 301 communicating with the first opening 102. The first flow channel 301 includes multiple sub-flow channels 3011 arranged and communicating along the circumference of the fixing plate 30. The valve core assembly 20 includes a rotating plate 22, which has an opening groove 230. Along the axial direction of the valve core assembly 20, the rotating plate 22 abuts against the fixing plate 30, and the rotating plate 22 can rotate relative to the fixing plate 30 around the axial direction of the valve core assembly 20, so that the shut-off valve has a closed state and an open state. When the shut-off valve 100 is in the closed state, the non-open area of ​​the rotating plate 22 blocks the first flow channel 301; when the shut-off valve is in the open state, the opening groove 230 and at least a portion of the first flow channel 301 form an overlapping area 201 along the axial direction of the valve core assembly 20. The overlapping area 201 is used for fluid to pass through, and the rate of change of the flow area of ​​the overlapping area 201 at the multiple sub-flow channels 3011 is different.

[0041] It should be noted that "non-opening area of ​​rotating plate 22" refers to the solid area on rotating plate 22 where no opening slot 230 is formed. "Flow area change rate of overlapping area 201" refers to the change in flow area of ​​overlapping area 201 of the flow channel corresponding to a unit angle of axial rotation of rotating plate 22 around valve core assembly 20.

[0042] It is understandable that by setting the first flow channel 301 to include multiple sub-flow channels 3011 arranged circumferentially and connected along the fixed plate 30, it is convenient that as the rotating plate 22 rotates axially around the valve core assembly 20, the opening groove 230 on the rotating plate 22 and different positions of the first flow channel 301 form an overlapping area 201. Furthermore, since the rate of change of the flow area in the overlapping area 201 is different in the multiple sub-flow channels 3011, in the sub-flow channels 3011 with a relatively small rate of change of flow area in the overlapping area 201, the flow rate of the shut-off valve 100 changes relatively slowly as the rotating plate 22 continues to rotate; while in the sub-flow channels 3011 with a relatively large rate of change of flow area in the overlapping area 201, the flow rate of the shut-off valve 100 changes relatively quickly as the rotating plate 22 continues to rotate. Thus, by rotating the rotating plate 22 to different sub-flow channels 3011, it is possible to achieve graded flow control of the shut-off valve 100, thereby improving the accuracy of flow regulation of the shut-off valve 100.

[0043] Optionally, in one embodiment, the number of sub-channels 3011 is configured to be two, and the two sub-channels 3011 are defined as a throttling section 302 and a fully open section 303, which are arranged along the circumference of the fixed plate 30 and are interconnected.

[0044] Furthermore, as the rotating plate 22 rotates, as the opening slot 230 moves from near the throttling section 302 towards near the fully open section 303, the flow area of ​​the overlapping region 201 continuously increases, and the rate of change of the flow area of ​​the overlapping region 201 at the throttling section 302 is less than the rate of change of the flow area at the fully open section 303.

[0045] As the flow area of ​​the overlapping region 201 continuously increases as the opening groove 230 moves from the throttling section 302 towards the fully open section 303, the flow rate of the shut-off valve 100 can be continuously increased during the rotation of the opening groove 230 from the throttling section 302 to the fully open section 303. Furthermore, since the rate of change of the flow area of ​​the overlapping region 201 in the throttling section 302 is less than that in the fully open section 303, the throttling section 302 and the fully open section 303 can also provide two-stage flow regulation for the fluid. When slow adjustment of the fluid flow rate is required, or when throttling of the fluid is required, the opening groove 230 can be rotated to correspond to the throttling section 302; when rapid adjustment of the fluid flow rate is required, the opening groove 230 can be rotated to correspond to the fully open section 303.

[0046] In one embodiment, the rotating plate 22 and the fixed plate 30 are stacked along the axial direction of the fixed plate 30, and are coaxially arranged. Both the rotating plate 22 and the fixed plate 30 are made of ceramic. This makes the rotating plate 22 and the fixed plate 30 wear-resistant and provides good sealing. Furthermore, it makes it easier to machine the opening groove 230 on the rotating plate 22 and the first flow channel 301 on the fixed plate 30.

[0047] The flow area of ​​both the throttling section 302 and the fully open section 303 is smaller than the flow area of ​​the opening slot 230, and the flow area of ​​the throttling section 302 is smaller than the flow area of ​​the fully open section 303. Specifically, the width of the throttling section 302 along the radial direction of the fixed piece 30 is smaller than the width of the fully open section 303 along the radial direction of the fixed piece 30. In this way, the flow area of ​​the overlapping region 201 in the throttling section 302 is smaller than the flow area in the fully open section 303.

[0048] like Figure 6 As shown, the fixed plate 30 includes a sealing area 312 and a connecting area 313 adjacent to each other along its circumference. Both the sealing area 312 and the connecting area 313 are configured in a fan shape. A first flow channel 301 is formed in the connecting area 313. The sealing area 312 is used to cooperate with the opening groove 230 to isolate the first flow channel 301 from the opening groove 230. Thus, when the rotating plate 22 rotates to the point where the opening groove 230 corresponds to the sealing area 312, the sealing area 312 can cover and close the first flow channel 301 to close the shut-off valve 100.

[0049] Furthermore, along the circumference of the fixing plate 30, the central angle formed by the two ends of the first flow channel 301 is α, and 0°<α≤170°. It should be noted that the central angle formed by the two ends of the first flow channel 301 refers to the included angle formed by the two radii on the fixing plate 30 passing through the two ends of the first flow channel 301.

[0050] The throttling section 302 extends in a long strip along the circumference of the fixed plate 30. Thus, when the rotating plate 22 rotates until the opening slot 230 corresponds to the throttling section 302, the throttling section 302 can throttle the fluid. Furthermore, when the rotating plate 22 rotates by a unit angle, the change in the flow area of ​​the overlapping region 201 formed by the opening slot 230 and the throttling section 302 is small, thereby achieving slow regulation of the fluid flow rate.

[0051] The width of the throttling section 302 can be set according to the user's actual needs along the direction from the throttling section 302 to the fully open section 303, so as to form the required overlapping area 201 in the throttling section 302. It should be noted that the width of the throttling section 302 refers to the width of the throttling section 302 along the radial direction of the fixing plate 30.

[0052] Alternatively, in one embodiment, such as Figure 5 As shown, the width of the throttling section 302 remains constant along the direction from the throttling section 302 to the fully open section 303. The flow rate curve of its overlapping region 201 is shown below. Figure 7 As shown.

[0053] In another embodiment, such as Figure 8 As shown, the width of the throttling section 302 decreases along the direction from the throttling section 302 to the fully open section 303. The flow rate curve of its overlapping region 201 is shown below. Figure 9 As shown. Specifically, the throttling section 302 includes two sub-throttling sections 3030 with constant widths, wherein the width of the sub-throttling section 3030 farther from the fully open section 303 is smaller than the width of the sub-throttling section 3030 closer to the fully open section 303. Thus, along the direction from the throttling section 302 to the fully open section 303, the width of the throttling section 302 decreases in a stepwise manner.

[0054] In yet another embodiment, such as Figure 10 As shown, the width of the throttling section 302 increases along the direction from the throttling section 302 to the fully open section 303. The flow rate curve of its overlapping region 201 is shown below. Figure 11 As shown. Specifically, the throttling section 302 is configured in a pointed shape so that the width of the throttling section 302 gradually increases along the direction from the throttling section 302 to the fully open section 303.

[0055] In yet another embodiment, such as Figure 12As shown, along the direction from the throttling section 302 to the fully open section 303, the width of the throttling section 302 exhibits an alternating trend of increasing and decreasing size. The flow rate curve of its overlapping region 201 is shown below. Figure 13 As shown. Specifically, multiple protrusions 3022 are provided within the throttling section 302. The width of the throttling section 302 decreases at the protrusions 3022. The multiple protrusions 3022 are arranged at intervals along the extension direction of the throttling section 302, so that the width of the throttling section 302 changes alternately.

[0056] To ensure that the fully open section 303 has a sufficiently large flow area, the fully open section 303 can be set in a fan shape. Alternatively, the fully open section can also be set in a rectangle, circle, square, or irregular shape. Here, irregular shape refers to an irregular shape.

[0057] In one embodiment, such as Figure 6 As shown, the outline of the throttling section 302 includes a first arc segment 304 and a first curved segment 305 connected together. Along the radial direction of the fixing plate 30, the first arc segment 304 is positioned closer to the outer edge of the fixing plate 30 relative to the first curved segment 305. The outline of the fully open section 303 includes a second arc segment 306 and a second curved segment 307. Along the radial direction of the fixing plate 30, the first arc segment 304 is positioned closer to the outer edge of the fixing plate 30 relative to the first curved segment 305. The first arc segment 304 and the second arc segment 306 are smoothly connected, and the first curved segment 305 and the second curved segment 307 are positioned at an angle at the junction of the throttling section 302 and the fully open section 303. It can be understood that the first arc segment 304 and the second arc segment 306 have regular shapes and are easy to process. When different flow curves of the overlapping area 201 need to be designed according to user requirements, only the shapes of the first curved segment 305 and the second curved segment 307 need to be designed, which helps to reduce the processing difficulty of the fixing plate 30.

[0058] For example, when the width of the throttling section 302 needs to gradually increase along the direction from the throttling section 302 to the fully open section 303, the first curved section 305 can also be set as an arc shape; when the width of the throttling section 302 needs to change alternately in size along the direction from the throttling section 302 to the fully open section 303, the first curved section 305 can be set as a wave shape. When the fully open section 303 needs to be fan-shaped, the second curved section 307 only needs to be designed as a broken line.

[0059] In one embodiment, such as Figure 6 As shown, the opening slot 230 is configured as a notch structure with a fan-shaped cross-section. Of course, it is not limited to this; in other embodiments, the opening slot 230 may also be configured as a hole-like structure.

[0060] Please refer to it again. Figure 1 and Figure 2The shut-off valve 100 also includes a drive motor 40, and the valve core assembly 20 also includes a valve stem 23. One end of the valve stem 23 is connected to the drive motor 40, and the other end is located in the valve cavity 101 and connected to the rotating plate 22. The drive motor 40 can drive the rotating plate 22 to rotate through the valve stem 23.

[0061] Specifically, the rotating plate 22 is provided with a mating groove 224, and the valve stem 23 is provided with a mating protrusion 231 at one end near the rotating plate 22. The mating protrusion 231 is inserted into the mating groove 224 and is fixedly connected to the rotating plate 22 along the circumference of the rotating plate 22.

[0062] The valve body assembly 10 includes a main valve body 11 and a fixing seat 12. The main valve body 11 has a valve cavity 101. The fixing seat 12 is fixedly connected to the main valve body 11, and the fixing seat 12 has a first opening 102 communicating with the valve cavity 101. The main valve body 11 has a second opening 103 communicating with the valve cavity 101. A fixing plate 30 is fixedly disposed at the first opening 102. The end face of the fixing seat 12 facing the valve cavity 101 has a mounting groove 130 and a limiting groove 122 communicating with the mounting groove 130. The outer periphery of the fixing plate 30 has at least one limiting protrusion 308. The fixing plate 30 is embedded in the mounting groove 130, and the limiting protrusion 308 is embedded in the limiting groove 122. The limiting protrusion 308 and the limiting groove 122 cooperate to prevent the fixing plate 30 from rotating relative to the fixing seat 12. In this way, it is convenient to install and remove the fixing plate 30, and the user can also replace the fixing plate 30 with different forms of the first flow channel 301 as needed.

[0063] The shut-off valve 100 also includes two connecting pipes 50, one of which is inserted and fixed to the first opening 102, and the other connecting pipe 50 is inserted and fixed to the second opening 103.

[0064] The following is based on Figures 3 to 5 Taking this application as an example, the working principle of the shut-off valve 100 is as follows: The rotating plate 22 rotates circumferentially from the throttling section 302 to the fully open section 303. When the rotating plate 22 rotates to the point where the opening groove 230 corresponds to the sealing area 312, the shut-off valve 100 is in a fully closed state. When the rotating plate 22 rotates to the point where the opening groove 230 corresponds to the throttling section 302, the shut-off valve 100 is in a small-opening throttling state. When the rotating plate 22 rotates to the point where the opening groove 230 begins to connect with the fully open section 303, the shut-off valve 100 enters a large-opening state until the flow area of ​​the overlapping area 201 formed by the opening groove 230 and the fully open section 303 reaches its maximum, at which point the shut-off valve 100 is in a fully open state. The shut-off valve 100 provided by this application can realize on / off, throttling, and ultra-wide range flow regulation functions.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A shut-off valve, characterized in that, The shut-off valve includes a valve body assembly (10), a valve core assembly (20), and a fixing plate (30). The valve body assembly (10) has a first opening (102). The fixing plate (30) is fixedly disposed at the first opening (102), and the fixing plate (30) has a first flow channel (301) communicating with the first opening (102). The first flow channel (301) includes multiple sub-flow channels (3011) arranged and communicating along the circumference of the fixing plate (30). The valve core assembly (20) includes a rotating plate (22) with an opening groove (230). Along the axial direction of the valve core assembly (20), the rotating plate (22) abuts against the fixed plate (30), and the rotating plate (22) can rotate relative to the fixed plate (30) around the axial direction of the valve core assembly (20) and enable the shut-off valve to have a closed state and an open state. When the shut-off valve is in the closed state, the non-open area of ​​the rotating plate (22) blocks the first flow channel (301); when the shut-off valve is in the open state, the opening groove (230) and at least a portion of the first flow channel (301) form an overlapping area (201) along the axial direction of the valve core assembly (20), the overlapping area (201) is used for fluid passage, and the flow area change rate of the overlapping area (201) is different at multiple sub-flow channels (3011).

2. The shut-off valve according to claim 1, characterized in that, The number of sub-channels (3011) is configured to be two, and the two sub-channels (3011) are defined as a throttling section (302) and a fully open section (303), respectively. The throttling section (302) and the fully open section (303) are arranged along the circumference of the fixed plate (30) and are interconnected.

3. The shut-off valve according to claim 2, characterized in that, As the rotating plate (22) rotates, during the process of the opening slot (230) rotating from near the throttling section (302) toward near the fully open section (303), the flow area of ​​the overlapping region (201) continuously increases, and the rate of change of the flow area of ​​the overlapping region (201) at the throttling section (302) is less than the rate of change of the flow area at the fully open section (303).

4. The shut-off valve according to claim 2, characterized in that, The width of the throttling section (302) along the radial direction of the fixing plate (30) is smaller than the width of the fully open section (303) along the radial direction of the fixing plate (30).

5. The shut-off valve according to claim 2, characterized in that, The fully open segment (303) is configured as a sector, rectangle, circle, square or irregular shape; The throttling section (302) extends in a long strip along the circumference of the fixed plate (30), and the width of the throttling section (302) is constant along the direction from the throttling section (302) to the fully open section (303); or the width of the throttling section (302) tends to decrease; or the width of the throttling section (302) tends to increase; or the width of the throttling section (302) tends to alternate between large and small.

6. The shut-off valve according to claim 2, characterized in that, The outline of the throttling section (302) includes a first arc segment (304) and a first curve segment (305) connected together. Along the radial direction of the fixing piece (30), the first arc segment (304) is disposed close to the outer edge of the fixing piece (30) relative to the first curve segment (305). The outline of the fully open section (303) includes a second arc section (306) and a second curve section (307). Along the radial direction of the fixing piece (30), the first arc section (304) is positioned closer to the outer edge of the fixing piece (30) than the first curve section (305). The first arc segment (304) and the second arc segment (306) are smoothly connected, and the first curve segment (305) and the second curve segment (307) are set at an angle at the junction of the throttling segment (302) and the fully open segment (303).

7. The shut-off valve according to claim 2, characterized in that, Along the circumference of the fixing piece (30), the central angle formed by the two ends of the first flow channel (301) is α, and 0°<α≤170°.

8. The shut-off valve according to claim 1, characterized in that, The fixing piece (30) includes a sealing area (312) and a connecting area (313) adjacent to each other along its circumference. Both the sealing area (312) and the connecting area (313) are configured as a fan-shaped structure. The first flow channel (301) is opened in the connecting area (313). The sealing area (312) is used to cooperate with the opening groove (230) to isolate the first flow channel (301) from the opening groove (230).

9. The shut-off valve according to claim 1, characterized in that, The opening slot (230) is configured as a notch structure with a fan-shaped cross-section.

10. The shut-off valve according to claim 1, characterized in that, The shut-off valve also includes a drive motor (40), and the valve core assembly (20) also includes a valve stem (23). One end of the valve stem (23) is connected to the drive motor (40), and the other end is connected to the rotating plate (22). The drive motor (40) can drive the rotating plate (22) to rotate through the valve stem (23).

Images