Valve device

Abstract

The application relates to a valve device, comprising a valve body, a cavity formed in the valve body, a valve port arranged in the cavity, a first connecting pipe hole, a cover part and a second connecting pipe hole arranged on the valve body; a valve core arranged in the cavity, the valve core being provided with a flow channel, the flow channel being provided with a first opening facing the valve port, the valve core being arranged to rotate around the axis of the first connecting pipe hole so that the first opening is in an open valve position in communication with the valve port or in a closed valve position arranged opposite the cover part; a sealing ring arranged to form a sealing connection between the valve core and the valve body; a sealing ring arranged to abut between the outer circumferential side of the first opening and the first side wall when the valve core is in the closed valve position, so as to form a sealing connection between the first opening and the first side wall; the sealing area of the valve core at the sealing ring is the same as or substantially the same as the sealing area of the valve core at the sealing ring. The rotation torque when the valve core rotates is reduced, thereby reducing the friction between the valve core and the valve seat.

Description

Technical Field

[0001] This application relates to the technical field of valves, and in particular to a valve device. Background Technology

[0002] Existing valve devices typically include a valve body and a valve core housed in the valve body cavity. The valve core rotates under the drive of a drive mechanism, thereby connecting or disconnecting the pipeline, thus changing the direction of fluid flow or the fluid flow rate.

[0003] However, in current valve devices, the axial pressure difference between the valve core and the opposite direction along its own axis is relatively large, which may affect the rotation of the valve core, resulting in a large rotational torque when the valve core rotates, and increasing the friction between the valve core and the valve body. Utility Model Content

[0004] Therefore, it is necessary to provide a valve device that reduces the axial pressure difference of the valve core.

[0005] This application provides a valve device, including a valve body with a cavity formed inside. A valve port is provided within the cavity. The valve body has a first connecting hole, a cover portion, and a second connecting hole. The cover portion is at least partially located within the cavity and beside the valve port. A connecting pipe in the second connecting hole communicates with the valve port. A valve core is disposed within the cavity and located between the valve port and the first connecting hole. The valve core has a flow channel communicating with the connecting pipe in the first connecting hole. The flow channel has a first opening facing the valve port. The valve core is arranged to rotate about the axis of the first connecting hole, so that the first opening... The valve is either in an open position connected to the valve port, or in a closed position opposite to the cover portion, and the side wall of the cover portion facing the valve core is defined as the first side wall; a sealing ring is disposed at the end of the valve core away from the second connecting pipe hole, and is located between the outer side wall of the valve core and the inner peripheral wall of the valve body to form a sealed connection between the valve core and the valve body; a sealing ring is disposed on the first side wall, and when the valve core is in the closed position, at least a portion of the sealing ring abuts against the outer peripheral side of the first opening and the first side wall to form a sealed connection between the first opening and the first side wall;

[0006] The sealing area of ​​the valve core at the sealing ring is the same as or substantially the same as the sealing area at the sealing ring.

[0007] In one embodiment, the inner peripheral wall of the valve body has a first annular groove for accommodating the sealing ring, and the sealing area of ​​the valve core at the sealing ring is defined as the first sealing area S1, where S1 = 0.25πd 2 d is the inner diameter of the sealing ring;

[0008] Alternatively, the outer peripheral wall of the valve core may have a second annular groove for accommodating the sealing ring, and the sealing area of ​​the valve core at the sealing ring may be defined as the first sealing area S1, where S1 = 0.25πd. 2 d is the outer diameter of the sealing ring.

[0009] In one embodiment, the sealing area of ​​the valve core at the sealing ring is defined as the second sealing area S. The total area of ​​the region enclosed by the outer periphery of the sealing ring is S2, and the total area of ​​the region enclosed by the inner periphery of the sealing ring is S3. The second sealing area S satisfies: S3 < S < S2. The valve core is subjected to a preload force F in the direction of the sealing ring. The preload force F satisfies: F ≥ P·|S1-S2| and F ≥ P·|S1-S3|, where P is the maximum pressure difference of the valve core in the positive and negative directions along its own axial direction.

[0010] In one embodiment, an elastic element is further provided between the valve core and the inner wall of the valve body, and the elastic element applies a preload force to the valve core in the direction of the sealing ring.

[0011] In one embodiment, the sealing ring includes a first sealing segment and a second sealing segment connected sequentially along its circumference. The first sealing segment is arranged near the valve port. A first receiving groove for accommodating the first sealing segment and a second receiving groove for accommodating the second sealing segment are formed on the first sidewall. A flange is formed on the side of the second sealing segment away from the valve core, and the cover portion is also provided with a receiving groove for accommodating the flange. The receiving groove communicates with the second receiving groove. In one embodiment, the valve body includes a valve seat and a cover body connected sequentially. A first connecting pipe hole is provided on the valve seat, and a second connecting pipe hole is provided on the cover body. The cavity includes a valve cavity located in the valve seat and a valve chamber located in the cover body. The valve core is located in the valve cavity. The inner circumferential wall of the cover body includes a first portion and a second portion connected sequentially along its circumference. An extension portion is formed by the first portion extending toward the second portion. A gap is left between the extension portion and the second portion to form the valve port. The cover portion includes at least the extension portion and forms a valve cover together with the cover body.

[0012] In one embodiment, the valve port and the cover are arranged sequentially along a first direction, the valve core is rotatably connected to the cover via a mounting shaft, the mounting shaft extends along a direction at an angle to the first direction, and the valve device further includes a drive mechanism for driving the valve core to rotate around the axis of the mounting shaft, the power output end of the drive mechanism being connected to the valve core.

[0013] In one embodiment, the sealing ring includes a first sealing segment and a second sealing segment connected sequentially along its circumference, the first sealing segment being arranged close to the valve port, and the first sealing segment having a through hole for the mounting shaft to pass through.

[0014] In one embodiment, the flow channel includes a first segment and a second segment connected sequentially along a second direction. The flow channel extends along the second direction, and the opening at the end of the second segment away from the first segment is the first opening. The first segment has a circular cross-section, and the second segment includes a first region and a second region connected sequentially along its circumferential direction. The second region gradually slopes towards the first region from the end of the first segment along the second direction.

[0015] In one embodiment, there is one first connecting hole and one second connecting hole, which are coaxially arranged. Compared with the prior art, in the valve device provided by this application, the sealing areas at both ends of the valve core are the same or substantially the same. In this case, the axial pressure difference along the positive and negative directions of the valve core will be greatly reduced, that is, the axial pressure difference force caused by the pressure difference between the inside and outside of the valve core during sealing is reduced, ensuring the reliable rotation of the valve core, which is beneficial to reducing the rotational torque of the valve core during rotation, thereby reducing the friction between the valve core and the valve seat, extending the service life of the valve core, and improving the control accuracy of the valve core rotation. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a perspective view of a valve device according to an embodiment of this application;

[0018] Figure 2 for Figure 1 A cross-sectional view of the first opening in the closed valve position;

[0019] Figure 3 for Figure 2 A magnified view of a section at point I;

[0020] Figure 4 for Figure 1 A cross-sectional view of the first opening in the valve open position;

[0021] Figure 5 for Figure 4 Enlarged view of a section at point II;

[0022] Figure 6 This is a schematic diagram of the valve core structure according to an embodiment of this application;

[0023] Figure 7 for Figure 6 A sectional view;

[0024] Figure 8 This is a schematic diagram of the valve cover structure according to an embodiment of this application;

[0025] Figure 9 for Figure 8 A sectional view;

[0026] Figure 10 This is a schematic diagram of the structure of a sealing ring according to an embodiment of this application;

[0027] Figure 11 for Figure 10 Another structural diagram;

[0028] Figure 12 for Figure 11 A cross-sectional view along the BB direction;

[0029] Figure 13 for Figure 2 A cross-sectional view along the AA direction.

[0030] Reference numerals: 1. Valve body; 10. Cavity; 11. Valve seat; 110. Valve cavity; 111. First connecting pipe hole; 112. First annular groove; 114. Annular rib; 12. Cover; 120. Valve chamber; 121. Second connecting pipe hole; 122. Valve port; 123. First part; 1231. Extension; 124. Second part; 13. Cover; 131. First sidewall; 1311. First receiving groove; 1312. Second receiving groove; 1313. Receiving groove; 14. Valve cover; 2. Valve core; 21. Flow channel; 210. First opening; 211. First section; 212. Second section; 2121. First area; 2122. Second area; 3. Mounting shaft; 4. Drive mechanism; 41. Driver; 411. Drive shaft; 4111. Threaded part; 42. Transmission assembly; 421. Gear; 81. Sealing ring; 811. First sealing section; 8110. Through hole; 812. Second sealing section; 8121. Flange; 9. Sealing ring. Detailed Implementation

[0031] 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.

[0032] 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," "side," "top," "bottom," and similar expressions used in this application's specification are merely for describing various exemplary structural parts and elements of this application. However, their use herein is for illustrative purposes only and is determined based on the exemplary orientations shown in the accompanying drawings, and does not represent the only possible implementation. Since the embodiments disclosed in this application can be arranged in different orientations, these terms indicating orientation are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0033] 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.

[0034] 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.

[0035] It should be noted that "axial arrangement" means that the overall arrangement direction is along the axial direction, including but not limited to axial extension, and may be at an angle to the axial direction.

[0036] 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.

[0037] like Figures 1-13 As shown, this application discloses a valve device. The valve device includes a valve body 1, a valve core 2, a sealing ring 9, and a sealing ring 81. The valve body 1 has an internal cavity 10, and a valve port 122 is located within the cavity 10. The valve body 1 has a first connecting hole 111, a cover portion 13, and a second connecting hole 121. The cover portion 13 is at least partially located within the cavity 10 and beside the valve port 122. The connecting pipe in the second connecting hole 121 communicates with the valve port 122. In this embodiment, the valve port 122 is located between the first connecting hole 111 and the second connecting hole 121.

[0038] like Figures 2-5 As shown, the valve core 2 is disposed within the cavity 10 and located between the valve port 122 and the first connecting pipe hole 111. The valve core 2 has a flow channel 21 that communicates with the connecting pipe in the first connecting pipe hole 111. The flow channel 21 has a first opening 210 facing the valve port 122. The valve core 2 is arranged to rotate about the axis of the first connecting pipe hole 111, so that the first opening 210 is in an open position communicating with the valve port 122, or in a closed position arranged opposite to the cover part 13. Both the first opening 210 and the valve port 122 are semi-circular holes.

[0039] In this embodiment, such as Figure 3 and Figure 4 As shown, the flow channel 21 includes a first segment 211 and a second segment 212 connected sequentially along the second direction Y. The flow channel 21 extends along the second direction Y. The end of the second segment 212 away from the first segment 211 is open, which is the first opening 210. The cross-section of the first segment 211 is circular. The second segment 212 includes a first region 2121 and a second region 2122 connected sequentially along its circumferential direction. The second region 2122 gradually slopes from the end of the first segment 211 towards the first region 2121 along the second direction Y. It can be understood that the flow channel 21 has a smooth transition between the first segment 211 and the second segment 212, allowing the fluid to flow more smoothly within the flow channel 21 and ensuring flow capacity. In this embodiment, as... Figures 1-4 and Figure 13As shown, the valve body 1 includes a valve seat 11 and a cover 12 connected in sequence. A first connecting hole 111 is provided on the valve seat 11, and a second connecting hole 121 is provided on the cover 12. In this embodiment, the first connecting hole 111 and the second connecting hole 121 are coaxially arranged. The axis of the valve port 122 is parallel to the axis of the second connecting hole 121, thus allowing for straight-line fluid flow, reducing resistance during fluid flow, and improving flow capacity. In this embodiment, there is one first connecting hole 111 and one second connecting hole 121; therefore, the valve device is a two-way valve.

[0040] In other embodiments (not shown in the figures), at least two first connecting holes 111 and one second connecting hole 121 may be used; or, at least two second connecting holes 121 and one first connecting hole 111 may be used; or, at least two first connecting holes 111 and at least two second connecting holes 121 may be used.

[0041] Furthermore, such as Figures 1-4 As shown, the cavity 10 includes a valve cavity 110 located within the valve seat 11 and a valve chamber 120 located within the cover 12. The valve core 2 and the sealing ring 9 are both located within the valve cavity 110. Specifically, the sealing ring 9 is located at the end of the valve core 2 away from the second connecting pipe hole 121, and the sealing ring 9 is located between the outer wall of the valve core 2 and the inner peripheral wall of the valve body 1 to form a sealed connection between the valve core 2 and the valve seat 11 of the valve body 1.

[0042] like Figure 9 As shown, the inner peripheral wall of the cover 12 includes a first part 123 and a second part 124 connected sequentially along its circumference. The first part 123 extends toward the second part 124 to form an extension 1231. A gap is left between the extension 1231 and the second part 124 to form a valve port 122. The cover 13 includes at least the extension 1231 and together with the cover 12 forms a valve cover 14.

[0043] In other embodiments, the covering portion 13 may include only the extension portion 1231. In this embodiment, in addition to the extension portion 1231, the covering portion 13 also includes a region on the cover 12 corresponding to the first portion 123.

[0044] like Figures 1-4 As shown, the sidewall of the cover portion 13 facing the valve core 2 is defined as the first sidewall 131. The sealing ring 81 is disposed on the first sidewall 131 and is annular. When the valve core 2 is in the closed position, at least part of the sealing ring 81 abuts between the outer peripheral side of the first opening 210 and the first sidewall 131 to form a sealed connection between the first opening 210 and the first sidewall 131.

[0045] Understandably, by using the combination of valve port 122 and cover part 13, the connecting pipe in the first connecting pipe hole 111 and the connecting pipe in the second connecting pipe hole 121 can be connected to valve port 122 through flow channel 21. The valve device achieves its closing purpose by blocking the first opening 210 of flow channel 21 with cover part 13, making the valve opening and closing more reliable. Furthermore, when the valve is open, valve core 2 does not occupy the space of valve port 122, nor does it additionally occupy the radial dimension of the valve body, resulting in better flow capacity. In addition, the space of valve port 122 can be utilized to the maximum extent, resulting in a higher flow capacity than on / off valves (such as gate valves, solenoid valves, and expansion valves) using valve bodies of the same outer diameter.

[0046] In this embodiment, such as Figures 1-4 As shown, the sealing area of ​​the valve core 2 at the sealing ring 9 is the same as or substantially the same as the sealing area at the sealing ring 81. Specifically, the sealing area of ​​the valve core 2 at the sealing ring 9 is defined as the first sealing area S1, and the sealing area of ​​the valve core 2 at the sealing ring 81 is defined as the second sealing area S. The first sealing area S1 and the second sealing area S are the same as or substantially the same.

[0047] Understandably, when the first sealing area S1 is the same as or substantially the same as the second sealing area S, that is, when the sealing areas at both ends of the valve core 2 are the same or substantially the same, the axial pressure difference along the positive and negative directions of the valve core 2 will be greatly reduced. This reduces the axial pressure difference caused by the pressure difference between the inside and outside of the valve core 2 during sealing, ensuring the reliable rotation of the valve core 2. This helps to reduce the rotational torque of the valve core 2 during rotation, thereby reducing the friction between the valve core and the valve seat, extending the service life of the valve core 2, and improving the control accuracy of the rotation of the valve core 2.

[0048] It should be noted that the axial pressure difference of valve core 2 is the first axial pressure - the second axial pressure. When the fluid flows in from the first connecting hole 111 (e.g., in the forward direction), the axial pressure of the fluid on the first end of valve core 2 is defined as the first axial pressure. When the fluid flows in from the second connecting hole 121 (e.g., in the reverse direction), the axial pressure of the fluid on the second end of valve core 2 is defined as the second axial pressure.

[0049] The first form of forming the first sealing area S1: The inner peripheral wall of the valve seat 11 of the valve body 1 is provided with a first annular groove 112 to accommodate the sealing ring 9. In this case, the first sealing area S1 = 0.25πd 2 d is the inner diameter of the sealing ring 9.

[0050] A second form of forming the first sealing area S1: A second annular groove for accommodating the sealing ring 9 is formed on the outer peripheral wall of the valve core 2. In this case, the first sealing area S1 = 0.25πd 2 d is the outer diameter of the sealing ring 9.

[0051] It should be noted that the first sealing area mentioned above is the area enclosed by the sealing ring.

[0052] like Figure 2 and Figure 4 As shown, an annular rib 114 extends inward from the valve cavity 110 near the first connecting pipe hole 111, and the annular rib 114 is located between the connecting pipe and the valve core 2 inside the first connecting pipe hole 111. The end of the valve core 2 away from the first opening 210 abuts against the annular rib 114. The sealing ring 9 is located between the annular rib 114 and the sealing ring 81.

[0053] Furthermore, such as Figure 11 As shown, the total area enclosed by the outer periphery of the sealing ring 81 is S2, and the total area enclosed by the inner periphery of the sealing ring 81 is S3. The second sealing area S satisfies: S3 < S < S2. The valve core 2 is subjected to a preload force F in the direction of the sealing ring 81. The preload force F satisfies: F ≥ P·|S1-S2| and F ≥ P·|S1-S3|, where P is the maximum pressure difference between the valve core 2 in the positive and negative directions along its own axial direction.

[0054] It is understandable that the preload will always be greater than the pressure difference between the forward and reverse sides, ensuring that the valve core 2 has sufficient sealing effect, while significantly reducing the friction force generated by the pressure difference, thereby reducing the rotational torque of the valve core 2, which in turn reduces the friction between the valve core 2 and the valve seat 11, extends the service life of the valve core 2, and improves the control accuracy of the rotation of the valve core 2.

[0055] Furthermore, an elastic element is provided between the valve core and the inner wall of the valve body. The elastic element applies a preload force to the valve core in the direction of the sealing ring. It can be understood that the elastic element provides sufficient preload force to always achieve the sealing preload between the valve core 2 and the sealing ring 81, and can be preloaded under both positive and negative pressure differences.

[0056] In this embodiment, such as Figures 10-12As shown, the sealing ring 81 includes a first sealing segment 811 and a second sealing segment 812 connected sequentially along its circumference. The first sealing segment 811 is arranged near the valve port 122. The first sidewall 131 has a first receiving groove 1311 for accommodating the first sealing segment 811 and a second receiving groove 1312 for accommodating the second sealing segment 812. A flange 8121 extends radially from the side of the second sealing segment 812 away from the valve core 2. The covering portion 13 also has a receiving groove 1313 for accommodating the flange 8121, and the receiving groove 1313 communicates with the second receiving groove 1312. In this embodiment, the flange 8121 is formed by extending outward from the outer circumference of the second sealing segment 812, in which case the receiving groove 1313 is located around the second receiving groove 1312. In other embodiments, the flange 8121 may also be formed by extending inward from the inner circumference of the second sealing segment 812, in which case the second receiving groove 1312 is located around the receiving groove 1313.

[0057] Understandably, the presence of flange 8121 can restrict the second sealing section 812 from disengaging from cover portion 13, thereby increasing the reliability of sealing ring 81 installation.

[0058] like Figure 2 and Figure 4 As shown, the valve port 122 and the cover portion 13 are arranged sequentially along the first direction X. The valve core 2 is rotatably connected to the cover portion 13 via a mounting shaft 3. The mounting shaft 3 extends along a direction at an angle to the first direction X. The valve device also includes a drive mechanism 4 for driving the valve core 2 to rotate around the axis of the mounting shaft 3. The power output end of the drive mechanism 4 is connected to the valve core 2. Thus, under the drive of the drive mechanism 4, the valve core 2 can be driven to rotate around the axis of the mounting shaft 3.

[0059] In this embodiment, such as Figure 13 As shown, the drive mechanism 4 includes a driver 41 and a transmission assembly 42. At least part of the driver 41 is located outside the valve body 1 and is fixedly connected to the valve body 1. The drive shaft 411 of the driver 41 is at an angle to the mounting shaft 3. At this time, the driver 41 is located on the side of the valve body 1, thus reserving more installation space for the driver 41 and facilitating the installation of the driver 41.

[0060] The aforementioned drive shaft 411 is located between the sealing ring 9 and the sealing ring 81. The transmission assembly 42 is located within the cavity 10 and includes a gear 421 and a transmission part for driving the gear 421 to rotate around the axis of the mounting shaft 3. The gear 421 is sleeved on the outer peripheral wall of the valve core 2 and is fixedly connected to the valve core 2. At least a portion of the drive shaft 411 is located within the cavity 10, and the transmission part is located on the drive shaft 411 and is in transmission cooperation with the gear 421. Thus, when the driver 41 is working, the drive shaft 411 drives the gear 421 to rotate. Since the gear 421 is fixedly connected to the outer peripheral wall of the valve core 2, it drives the valve core 2 to rotate.

[0061] In other embodiments, the transmission part may be a gear assembly. In this embodiment, the transmission part is a threaded portion 4111 formed on the outer peripheral wall of the drive shaft 411, and the threaded portion 4111 meshes with the gear 421 for transmission. The power output end of the drive mechanism described above is the gear 421.

[0062] If the driver 41 is a motor, then the drive shaft 411 of the motor is perpendicular or substantially perpendicular to the mounting shaft 3. Therefore, sufficient space is reserved for the motor coil to facilitate coil installation and avoid interference between the coil and the valve body 1.

[0063] It should be noted that "basically perpendicular" means "close to perpendicular, that is, the angle between them is close to 90°".

[0064] like Figures 10-12 As shown, the sealing ring 81 includes a first sealing section 811 and a second sealing section 812 connected sequentially along its circumference. The first sealing section 811 is arranged near the valve port 122 and has a through hole 8110 for the mounting shaft 3 to pass through. Since the first sealing section 811 abuts against the corresponding position between the first side wall 131 and the outer peripheral side of the first opening 210, and has a through hole for the mounting shaft 3 to pass through, the first sealing section 811 seals the outer peripheral wall of the mounting shaft 3, preventing the fluid in the flow channel 21 and / or valve chamber 110 from contacting the mounting shaft 3, thus extending the service life of the mounting shaft.

[0065] Furthermore, the aforementioned mounting shaft 3 is also coaxially arranged with the first connecting pipe hole 111 and the second connecting pipe hole 121. This avoids occupying space within the flow channel 21 while ensuring more reliable straight-line fluid flow and better flow capacity. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0066] The above embodiments merely illustrate 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 protection scope of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A valve device, characterized in that, include: A valve body (1) has a cavity (10) inside. A valve port (122) is provided in the cavity (10). The valve body (1) is provided with a first connecting pipe hole (111), a cover part (13) and a second connecting pipe hole (121). The cover part (13) is at least partially located in the cavity (10) and is located beside the valve port (122). The connecting pipe in the second connecting pipe hole (121) is connected to the valve port (122). A valve core (2) is disposed in the cavity (10) and located between the valve port (122) and the first connecting pipe hole (111). The valve core (2) is provided with a flow channel (21) communicating with the connecting pipe in the first connecting pipe hole (111). The flow channel (21) has a first opening (210) facing the valve port (122). The valve core (2) is arranged to rotate about the axis of the first connecting pipe hole (111) so that the first opening (210) is in an open position communicating with the valve port (122) or in a closed position arranged opposite to the cover (13). The side wall of the cover (13) facing the valve core (2) is defined as the first side wall (131). A sealing ring (9) is provided at one end of the valve core (2) away from the second connecting hole (121) and located between the outer wall of the valve core (2) and the inner peripheral wall of the valve body (1) to form a sealed connection between the valve core (2) and the valve body (1). A sealing ring (81) is provided on the first side wall (131). When the valve core (2) is in the closed position, at least part of the sealing ring (81) abuts between the outer periphery of the first opening (210) and the first side wall (131) to form a sealed connection between the first opening (210) and the first side wall (131). The sealing area of ​​the valve core (2) at the sealing ring (9) is the same as or substantially the same as the sealing area at the sealing ring (81).

2. The valve device according to claim 1, characterized in that, The inner circumferential wall of the valve body (1) is provided with a first annular groove (112) for accommodating the sealing ring (9). The sealing area of ​​the valve core (2) at the sealing ring (9) is defined as the first sealing area S1, where S1 = 0.25πd. 2 d is the inner diameter of the sealing ring (9); Alternatively, the outer peripheral wall of the valve core (2) may be provided with a second annular groove to accommodate the sealing ring (9), and the sealing area of ​​the valve core (2) at the sealing ring (9) may be defined as the first sealing area S1, where S1 = 0.25πd 2 d is the outer diameter of the sealing ring (9).

3. The valve device according to claim 2, characterized in that, The sealing area of ​​the valve core (2) at the sealing ring (81) is defined as the second sealing area S. The total area of ​​the region enclosed by the outer periphery of the sealing ring (81) is S2, and the total area of ​​the region enclosed by the inner periphery of the sealing ring (81) is S3. The second sealing area S satisfies: S3 < S < S2. The valve core (2) is subjected to a preload force F in the direction toward the sealing ring (81). The preload force F satisfies: F ≥ P·|S1-S2| and F ≥ P·|S1-S3|, where P is the maximum pressure difference of the valve core (2) in the positive and negative directions along its own axial direction.

4. The valve device according to claim 3, characterized in that, An elastic element is also provided between the valve core (2) and the inner wall of the valve body (1), and the elastic element applies a pre-tightening force to the valve core (2) in the direction of the sealing ring (81).

5. The valve device according to claim 1, characterized in that, The sealing ring (81) includes a first sealing section (811) and a second sealing section (812) connected sequentially along its circumference. The first sealing section (811) is arranged close to the valve port (122). The first sidewall (131) is provided with a first receiving groove (1311) for accommodating the first sealing section (811) and a second receiving groove (1312) for accommodating the second sealing section (812). The second sealing section (812) extends radially on the side away from the valve core (2) and forms a flange (8121). The cover portion (13) is also provided with a receiving groove (1313) for accommodating the flange (8121). The receiving groove (1313) is connected to the second receiving groove (1312).

6. The valve device according to claim 1, characterized in that, The valve body (1) includes a valve seat (11) and a cover (12) connected in sequence. The first connecting hole (111) is provided on the valve seat (11), and the second connecting hole (121) is provided on the cover (12). The cavity (10) includes a valve cavity (110) located in the valve seat (11) and a valve chamber (120) located in the cover (12). The valve core (2) is located in the valve cavity (110), and the inner peripheral wall of the cover (12) is covered with... The valve includes a first part (123) and a second part (124) connected sequentially along its circumference. The first part (123) extends toward the second part (124) to form an extension (1231). The extension (1231) and the second part (124) are separated to form the valve port (122). The cover (13) includes at least the extension (1231) and together with the cover (12) forms a valve cover (14).

7. The valve device according to claim 1, characterized in that, The valve port (122) and the cover (13) are arranged sequentially along the first direction (X). The valve core (2) is rotatably connected to the cover (13) via the mounting shaft (3). The mounting shaft (3) extends along a direction that is at an angle to the first direction (X). The valve device also includes a drive mechanism (4) for driving the valve core (2) to rotate around the axis of the mounting shaft (3). The power output end of the drive mechanism (4) is connected to the valve core (2).

8. The valve device according to claim 7, characterized in that, The sealing ring (81) includes a first sealing section (811) and a second sealing section (812) connected sequentially along its circumference. The first sealing section (811) is arranged close to the valve port (122) and has a through hole (8110) for the mounting shaft (3) to pass through.

9. The valve device according to claim 1, characterized in that, The flow channel (21) includes a first segment (211) and a second segment (212) connected sequentially along the second direction (Y). The flow channel (21) extends along the second direction (Y). The opening at the end of the second segment (212) away from the first segment (211) is the first opening (210). The cross-section of the first segment (211) is circular. The second segment (212) includes a first region (2121) and a second region (2122) connected sequentially along its circumferential direction. The second region (2122) gradually slopes from the end of the first segment (211) towards the first region (2121) along the second direction (Y).

10. The valve device according to any one of claims 1 to 9, characterized in that, There is one first connecting hole (111) and one second connecting hole (121), and they are coaxially arranged.

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