Valve device

Abstract

The application relates to a valve device, which comprises 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, the first connecting pipe hole and the second connecting pipe hole are coaxially arranged, the valve port is located between the first connecting pipe hole and the second connecting pipe hole and is in communication with a connecting pipe in the second connecting pipe hole, the axis of the valve port is parallel to the axis of the second connecting pipe hole, the cover part is at least partially located in the cavity and is located on the side of the valve port, a valve core is arranged in the cavity and is located between the valve port and the first connecting pipe hole, the valve core is provided with a flow channel in communication with the connecting pipe in the first connecting pipe hole, the flow channel has a first opening facing the valve port, the valve core is arranged to rotate around the axis of the first connecting pipe hole so that the first opening is arranged in an open valve position in communication with the valve port or is arranged in a closed valve position opposite to the cover part and is blocked by the cover part. The on-off valve is more reliable, the flow capacity is better when the valve is opened.

Description

Technical Field

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

[0002] Existing valve devices typically include a valve body, a valve seat, and a valve core housed in the valve body cavity. The movement of the valve core is used to connect or disconnect the pipeline, thereby changing the direction of fluid flow or the flow rate of the fluid.

[0003] However, in current valve devices, the valve opening and closing relies on the movement of the valve core along the valve body. This obstructs the fluid flow within the valve body, increasing resistance. Furthermore, while maintaining the same valve body outer diameter, the valve opening is relatively small, resulting in a low flow coefficient and poor flow capacity. Utility Model Content

[0004] Therefore, it is necessary to provide a valve device that can improve flow capacity while maintaining the same valve body diameter.

[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 first connecting hole and the second connecting hole are coaxially arranged. The valve port is located between the first and second connecting holes and communicates with a connecting pipe inside the second connecting hole. The axis of the valve port is parallel to the axis of the second connecting hole. The cover portion is at least partially located within the cavity and beside the valve port. A valve core is disposed within the cavity and between the valve port and the first connecting hole. The valve core has a flow channel communicating with a connecting pipe inside 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, such that the first opening is in an open position communicating with the valve port, or in a closed position opposite to and blocked by the cover portion. In one embodiment, the inner peripheral wall of the valve body includes a first part and a second part connected sequentially along its circumference. The first part extends toward the second part to form an extension. The extension and the second part are spaced apart to form the valve port. The covering part includes at least the extension.

[0006] In one embodiment, the valve body includes a valve seat and a cover that are connected in sequence and arranged coaxially. The first connecting pipe hole is located at the end of the valve seat away from the cover, and the second connecting pipe hole is located at the end of the cover away from the valve seat. The cavity includes a valve cavity located within the valve seat, and the valve core is located within the valve cavity. Both the first part and the second part are located on the cover.

[0007] In one embodiment, a stop structure is provided between the valve body and the valve core to limit the rotation angle of the valve core.

[0008] In one embodiment, the cover and the covering portion together form a valve cover. The end wall of the valve cover facing the valve core is defined as the first end wall. The stop structure includes a first stop portion and a second stop portion. The first stop portion is disposed on the first end wall, and the second stop portion is disposed on the peripheral wall of the valve core. The first stop portion is located on the rotation path of the second stop portion. When the first opening is in the valve open position, one end of the second stop portion abuts against the first end of the first stop portion. When the first opening is in the valve closed position, the other end of the second stop portion abuts against the second end of the first stop portion.

[0009] In one embodiment, the valve port and the cover are arranged sequentially along a first direction, the valve core is rotatably connected to the valve body 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.

[0010] In one embodiment, the drive mechanism includes a driver and a transmission assembly, at least a portion of the driver is located outside the valve body and is fixedly connected to the valve body, the drive shaft of the driver is connected to the valve core through the transmission assembly, and the drive shaft is at an angle to the mounting shaft.

[0011] In one embodiment, the transmission assembly is located within the cavity and includes a gear and a transmission part for driving the gear to rotate about the axis of the mounting shaft. The gear is sleeved on the outer peripheral wall of the valve core and is fixedly connected to the valve core. At least a portion of the drive shaft is located within the cavity, and the transmission part is disposed on the drive shaft and engages with the gear in a transmission cooperation.

[0012] In one embodiment, the driver includes a connector with a first through hole for the drive shaft to pass through, and the connector is welded to the outer wall of the valve body.

[0013] In one embodiment, the sidewall of the cover portion facing the valve core is defined as the first sidewall. The first sidewall is provided with an annular sealing ring. The valve body includes a valve seat and a cover body connected in sequence. The first connecting pipe hole is provided on the valve seat, and the second connecting pipe hole is provided on the cover body. The cavity includes a valve cavity provided in the valve seat. The valve core is located in the valve cavity. The valve port and the cover portion are both provided at the end of the cover body near the valve seat. When the first opening is in the closed position, at least a portion of the sealing ring abuts between the outer periphery of the first opening and the first sidewall to form a sealed connection between the first opening and the first sidewall. When the first opening is in the open position, the channel connecting the flow channel and the valve port is defined as the fluid channel. The first opening and the valve port are not sealed together so that the fluid channel is connected to the valve cavity.

[0014] In one embodiment, a sealing ring is provided at the end of the valve core away from the second connecting pipe hole. The sealing ring is located between the outer 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. The side wall of the cover portion facing the valve core is defined as the first side wall. The first side wall is provided with an annular sealing ring. When the first opening is in the closed position, at least a portion of the sealing ring abuts between 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.

[0015] In one embodiment, a third bearing is provided between the valve core and the inner peripheral wall of the valve body, the third bearing being located between the sealing ring and the sealing ring.

[0016] In one embodiment, the sealing area of ​​the valve core at the sealing ring is defined as the first sealing area S1, and the sealing area of ​​the valve core at the sealing ring is defined as the second sealing area S, wherein the first sealing area S1 is the same as or substantially the same as the second sealing area S.

[0017] 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;

[0018] 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.

[0019] In one embodiment, the total area enclosed by the outer periphery of the sealing ring is S2, and the total area 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 toward 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.

[0020] In one embodiment, the wall of 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. The opening at the end of the second segment away from the first segment is the first opening. The cross-section of the first segment is circular. The second segment includes a first region and a second region connected sequentially along its circumferential direction. The second region gradually slopes from the end of the first segment toward the first region along the second direction.

[0021] Compared with existing technologies, the valve device provided in this application employs a valve port and a cover portion in a cooperative manner. The connecting pipes in the first and second connecting pipe ports are connected to the valve port through a flow channel. The valve is closed by the cover portion blocking the first opening of the flow channel, making the valve opening and closing more reliable. Furthermore, the first and second connecting pipe ports are coaxially arranged, and the axis of the valve port is parallel to the axis of the second connecting pipe port. This ensures straight fluid flow, reduces the resistance to fluid flow inside the valve body, and results in strong flow capacity. In addition, the rotation of the valve core maximizes the use of the valve port space. When the valve is open, the valve core does not occupy the space of the valve port, resulting in better flow capacity, which is higher than that of a valve body with the same outer diameter. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a perspective view of a valve device according to an embodiment of this application;

[0024] Figure 2 for Figure 1 A cross-sectional view of the first opening in the closed valve position;

[0025] Figure 3 for Figure 2 A magnified view of a section at point I;

[0026] Figure 4 for Figure 1 A cross-sectional view of the first opening in the valve open position;

[0027] Figure 5 for Figure 4 Enlarged view of a section at point II;

[0028] Figure 6 for Figure 2 A cross-sectional view along the BB direction;

[0029] Figure 7 This is a schematic diagram of the valve core structure according to an embodiment of this application;

[0030] Figure 8 for Figure 7 A sectional view;

[0031] Figure 9 This is a schematic diagram of the valve cover structure according to an embodiment of this application;

[0032] Figure 10 for Figure 9 Another structural diagram;

[0033] Figure 11 for Figure 10 A sectional view;

[0034] Figure 12 This is a schematic diagram of the structure of a sealing element according to an embodiment of this application;

[0035] Figure 13 for Figure 12 Another structural diagram;

[0036] Figure 14 for Figure 13 A cross-sectional view along the CC direction;

[0037] Figure 15 This is a schematic diagram of the structure of a sealing element according to another embodiment of this application;

[0038] Figure 16 for Figure 15 A cross-sectional view along the DD direction;

[0039] Figure 17 for Figure 2 A cross-sectional view along the AA direction;

[0040] Figure 18 This is a schematic diagram of the structure of the valve seat and the connecting seat after assembly in one embodiment of this application;

[0041] Figure 19 for Figure 18 A cross-sectional view along the HH direction;

[0042] Figure 20 for Figure 19 A magnified view of a section at point III;

[0043] Figure 21 for Figure 20 A schematic diagram of a structure with a welding ring installed in the middle;

[0044] Figure 22 for Figure 19 Cross-sectional view of the middle valve seat;

[0045] Figure 23 This is a cross-sectional view of the valve device according to another embodiment of the present application, showing the first opening in the valve open position.

[0046] Figure 24 for Figure 23 A magnified view of a section at point IV in the middle;

[0047] Figure 25 This is a cross-sectional view of a valve seat according to another embodiment of this application.

[0048] Reference numerals: 1. Valve body; 10. Cavity; 11. Valve seat; 11a. Main seat; 11b. Connecting part; 110. Valve cavity; 1101. First cavity; 1102. Second cavity; 111. First connecting hole; 112. Connecting channel; 1121. First end; 1122. Second groove; 113. Solder groove; 1131. Groove wall; 1132. First groove surface; 1133. Second groove surface; 114. Annular rib; 115. Slot; 116. First annular groove; 12. Cover; 120. Valve chamber; 121. Second... 1. Connecting pipe hole; 122. Valve port; 123. First part; 1231. Extension; 124. Second part; 13. Covering part; 130. Guide surface; 131. First side wall; 14. Valve cover; 141. First end wall; 1411. First stop part; 1412. First groove; 1413. Second groove; 1414. Receiving groove; 15. Fluid passage; 2. Valve core; 21. Flow channel; 210. First opening; 211. First section; 212. Second section; 2121. First area; 2122. Second area; 22. Second stop; 23, First end face; 231, Opening; 24, Communicating channel; 3, Mounting shaft; 4, Drive mechanism; 41, Driver; 41a, Housing; 410, Connecting seat; 4101, First through hole; 411, Drive shaft; 4111, Threaded part; 4112, Limiting step; 4113, Stepped part; 4114, Gasket; 412, Rotor; 413, Mounting part; 413a, Connecting section; 4130, Abutting surface; 4131, Mounting channel; 4132, Insertion section; 4133, First groove; 42, Transmission Components; 421, Gear; 5, Welding ring; 61, First bearing; 62, Second bearing; 63, Third bearing; 7, Stop structure; 8, Seal; 81, Sealing ring; 810, First surface; 811, First sealing section; 8110, Second perforation; 8111, First sealing part; 8112, Second sealing part; 8113, Second chamfer; 812, Second sealing section; 82, Third sealing section; 820, Second surface; 821, Vent groove; 8211, First chamfer; 83, Annular body; 832, Flange; 9, Sealing ring. Detailed Implementation

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] like Figures 1-25As shown, this application discloses a valve device. The valve device includes a valve body 1 and a valve core 2. The valve body 1 has a cavity 10 formed inside, and a valve port 122 is disposed in the cavity 10. The valve body 1 has a first connecting hole 111, a cover part 13 and a second connecting hole 121. The cover part 13 is at least partially located in the cavity 10 and is located beside the valve port 122. The valve port 122 is located between the first connecting hole 111 and the second connecting hole 121 and is connected to the connecting pipe in the second connecting hole 121.

[0056] like Figures 2-5 As shown, the 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 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 be able to rotate circumferentially relative to the valve body 1 so that the first opening 210 is in the open position that is arranged opposite to and communicates with the valve port 122, or in the closed position that is arranged opposite to and blocked by the covering part 13.

[0057] 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. The valve opening and closing is 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 the valve port 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.

[0058] Both the first opening 210 and the valve port 122 mentioned above are semi-circular holes. In this embodiment, as... Figures 1-6 As shown, the first connecting hole 111 and the second connecting hole 121 are arranged coaxially, and the axis of the valve port 122 is parallel to the axis of the second connecting hole 121. This allows for straight-line fluid flow, reduces resistance during fluid flow, and improves flow capacity. In this embodiment, there is one of each of the first connecting hole 111 and the second connecting hole 121; therefore, the valve device is a two-way valve.

[0059] 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.

[0060] In order to form the valve port 122 and the cover portion 13 described above, in this embodiment, as follows: Figure 11As shown, the inner peripheral wall of the valve body 1 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 part 13 includes at least the extension 1231.

[0061] Furthermore, such as Figures 1-5 As shown, the valve body 1 includes a valve seat 11 and a cover 12 arranged coaxially and connected in sequence. A first connecting hole 111 is located at the end of the valve seat 11 away from the cover 12, and a second connecting hole 121 is located at the end of the cover 12 away from the valve seat 11. 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 first part 123 and the second part 124 are both located on the cover 12. Thus, the covering part 13 and the valve port 122 are both located on the cover 12.

[0062] like Figures 1-4 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 of the valve body 1 via a mounting shaft 3, which extends along a direction at an angle to the first direction X. The mounting shaft 3 is also coaxially arranged with the first connecting hole 111 and the second connecting hole 121. In this way, while avoiding occupying space within the flow channel 21, more reliable straight-line flow of fluid is ensured, resulting in better flow capacity.

[0063] like Figure 1 , Figure 6 and Figure 17 As shown, 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.

[0064] In this embodiment, 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 connected to the valve core 2 through the transmission assembly 42, and the drive shaft 411 is at an angle to the mounting shaft 3. At this time, the driver 41 is located beside the valve body 1, thus reserving more installation space for the driver 41 and facilitating its installation.

[0065] like Figure 1 , Figure 6 and Figure 17As shown, 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 disposed 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.

[0066] In other embodiments, the transmission unit may be a gear assembly. In this embodiment, such as Figure 17 As shown, the transmission part is a threaded part 4111 formed on the outer peripheral wall of the drive shaft 411, and the threaded part 4111 meshes with the gear 421 for transmission.

[0067] If driver 41 is a motor, then, as Figure 2 , Figure 4 and 17 As shown, 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.

[0068] It should be noted that "basically perpendicular" means "close to perpendicular, that is, the angle between them is close to 90°".

[0069] like Figure 17 As shown, the motor includes a rotor 412, which is connected to the drive shaft 411 by welding. This increases the connection strength and reliability between the rotor 412 and the drive shaft 411.

[0070] Furthermore, the actuator 41 is fixedly connected to the outer wall of the valve body 1 by welding. This avoids the risk of fastener loosening that can occur with fastener connections, increases the strength and reliability of the connection between the actuator 41 and the valve body 1, and reduces processing costs.

[0071] Specifically, such as Figure 1 , Figure 6 and Figure 17 As shown, the driver 41 includes a housing 41a, and a rotor 412 is disposed inside the housing 41a. The housing 41a includes a connecting seat 410, which has a first through hole 4101 for the drive shaft 411 to pass through. The valve body 1 has a connecting channel 112 corresponding to the first through hole 4101, which communicates with the cavity 10. The connecting seat 410 and the valve body 1 are welded and fixed at the corresponding positions of the connecting channel 112. Because the connecting seat 410 is welded and fixed to the valve body 1, the gap between the contact surface of the connecting seat 410 and the valve body 1 is reduced. Vibration energy can be absorbed through the connecting seat 410, noise can be reduced, and sealing performance can be increased.

[0072] In this embodiment, the outer surface of the connecting seat 410 is provided with a mounting part 413 at the position corresponding to the first through hole 4101. The valve body 1 has a connecting channel 112 that is inserted and fitted with the mounting part 413. The mounting part 413 has a mounting channel 4131 that is coaxially arranged and connected to the connecting channel 112. That is, the first through hole 4101, the mounting channel 4131 and the connecting channel 112 are arranged coaxially.

[0073] like Figures 17-19 As shown, the valve seat 11 of the valve body 1 includes a main seat 11a and a connecting portion 11b disposed on the outer wall of the main seat 11a. The valve core 2 is disposed within the main seat 11a. The connecting portion 11b extends axially along the drive shaft 411, and the connecting channel 112 is located within the connecting portion 11b. Specifically, a first cavity 1101 is provided within the main seat 11a, and the valve core 2 is disposed within the first cavity 1101. The connecting portion 11b also has a second cavity 1102, which is located beside the first cavity 1101. Furthermore, the second cavity 1102 is located on the side of the connecting channel 112 opposite to the connecting seat 410, and the second cavity 1102 is coaxially arranged with the mounting channel 4131. A portion of the aforementioned drive shaft 411 is located within the second cavity 1102.

[0074] In other embodiments (not shown), the mounting part 413 is sleeved around the connecting channel 112. In this embodiment, as... Figures 19-21 As shown, at least part of the mounting portion 413 is welded and fixed within the connecting channel 112. It is understood that welding increases the connection strength, reduces the gap between the connecting seat 410 and the valve body 1, absorbs vibration energy through the connecting seat 410, reduces noise, and increases sealing performance.

[0075] The following explanation uses two welding methods.

[0076] The first welding method is as follows: the mounting part 413 is fixed to the connecting channel 112 by brazing.

[0077] Specifically, such as Figures 18-22 As shown, the end of the connecting part 11b near the connecting seat 410 is defined as the first end 1121. The first end 1121 abuts against the mounting part 413. The plane where the first end 1121 is located is defined as the first plane D. The two outermost endpoints of the main seat 11a arranged at intervals along the axial direction of the connecting part 11b are defined as the first point E and the second point G, respectively. The first point E is arranged on the same side as the first end 1121. The plane passing through the first point E and arranged side by side with the first plane D is defined as the second plane F. The first plane D is located between the second plane F and the second point G.

[0078] It is understandable that when the driver is located above the main seat 11a, the connecting part 11b is lowered relative to the second plane F. Since the connecting seat 410 is welded to the connecting part 11b of the valve body 1, part of the connecting seat 410 is located between the second plane F and the first end 1121. After the driver 41 is installed, the overall height of the driver 41 and the valve body 1 is reduced, the space utilization is improved, and the length of the drive shaft 411 is shortened.

[0079] Furthermore, such as Figures 19-21 As shown, the mounting part 413 includes an insertion section 4132 located within the connecting channel 112 and an abutment surface 4130 abutting against the first end. A solder groove 113 for accommodating solder is provided at the junction of the outer wall of the insertion section 4132 and the abutment surface 4130. The solder groove 113 extends circumferentially along the insertion section 4132. The presence of the solder groove 113 facilitates the placement of solder. Specifically, the mounting part 413 also includes a connecting section 413a located outside the connecting channel 112. The cross-sectional area of ​​the connecting section 413a is larger than the cross-sectional area of ​​the insertion section 4132. The insertion section 4132 is disposed on the first wall of the connecting section 413a on the side opposite to the connecting seat 410. The area of ​​the first wall other than the area connected to the insertion section 4132 is the aforementioned abutment surface 4130.

[0080] The welding components can be welding wire, welding rod, etc., or welding rings.

[0081] Furthermore, such as Figure 20 As shown, the side of the solder bath 113 away from the connector 410 is defined as the bath wall surface 1131. The bath wall surface 1131 includes a guide surface for guiding the solder away from the connector 410. The presence of the guide surface can guide the solder, improve the wetting and guiding effect of the solder, and help improve the welding qualification rate.

[0082] The solder bath 113 may be formed only on the inner peripheral wall of the connecting channel 112, or it may be formed only on the outer peripheral wall of the mounting part 413. In this embodiment, as... Figures 19-21 As shown, the solder groove 113 includes a first groove 4133 located on the outer peripheral wall of the insertion section 4132 and a second groove 1122 located on the inner peripheral wall of the connecting channel 112. Thus, when the solder groove 113 is formed by the first groove 4133 and the second groove 1122, it ensures the connection strength between the connecting seat 410 and the valve body 1, while also ensuring the strength of the connecting channel 112 and the mounting part 413 themselves, avoiding the problem of insufficient strength of the connecting channel 112 or the mounting part 413 due to the groove only being formed on the connecting channel 112 or the mounting part 413.

[0083] The groove wall surface 1131 includes a first groove surface 1132 and a second groove surface 1133. The first groove surface 1132 and the second groove surface 1133 are the groove surfaces of the first groove 4133 and the second groove 1122 away from the connecting seat 410, respectively, and at least a portion of the first groove surface 1132 and / or the second groove surface 1133 is a flow guiding surface. That is, the first groove surface 1132 or the second groove surface 1133 includes a flow guiding surface, or both the first groove surface 1132 and the second groove surface 1133 include a flow guiding surface.

[0084] In this embodiment, such as Figure 20 As shown, the connector 410 and the mounting part 413 are arranged sequentially along the first direction X. Both the first groove surface 1132 and the second groove surface 1133 are flow guiding surfaces, and both gradually tilt towards the opposite direction along the first direction X, meaning the distance between the first groove surface 1132 and the second groove surface 1133 gradually decreases along the first direction X. Thus, the presence of these two flow guiding surfaces better guides the solder on both the inner and outer sides, further improving the solder's wetting and flow guiding effects.

[0085] It should be noted that the aforementioned guide surface can be an inclined surface or an arc-shaped surface.

[0086] The second welding method is as follows: the mounting part 413 is welded and fixed to the valve body 1 by laser welding.

[0087] Specifically, the end of the connecting part 11b closest to the connecting channel 112 is defined as the first end 1121, which abuts against the mounting part. The plane containing the first end 1121 is defined as the first plane D. The two outermost endpoints of the main seat 11a, spaced apart along the axial direction of the connecting part 11b, are defined as the first point E and the second point G, respectively. The first point E is located on the same side as the first end 1121. The plane passing through the first point E and arranged parallel to the first plane D is defined as the second plane F, which coincides with the first plane D; or, as... Figure 25 As shown, the second plane F is located between the first plane D and the second point G. Thus, when the actuator is located above the main seat 11a, the laser welding plane is higher than the highest surface of the outer diameter of the valve body 1, facilitating laser welding.

[0088] like Figure 17 As shown, the drive shaft 411 is fitted with at least two bearings, which are spaced apart along the axial direction of the drive shaft 411. It is understood that the arrangement of at least two bearings on the drive shaft 411 improves the concentricity of the drive shaft 411's rotation, while reducing the friction and increasing transmission efficiency. The at least two bearings are located respectively within the connecting seat 410 and the valve body 1. This separate arrangement facilitates the installation and positioning of the bearings when the same specifications are selected; otherwise, it would be difficult to install and position two bearings of the same specifications within the valve body.

[0089] like Figure 17 As shown, at least one bearing is located within the mounting channel 4131 and at least one bearing is located within the cavity 10. The bearing located within the mounting channel 4131 is defined as the first bearing 61. A shim 4114 is fixed within the mounting channel 4131, abutting against the first bearing 61 and limiting its axial movement. A limiting step 4112 is located on the outer peripheral wall of the drive shaft 411. The first bearing 61 is positioned between the shim 4114 and the limiting step 4112. Thus, the axial limitation of the first bearing 61 is achieved through the limiting step 4112 and the shim 4114.

[0090] The gasket 4114 is fixedly connected to the inner circumferential wall of the valve body 1 by welding or riveting. The gasket 4114 and the valve body 1 are separate parts, which facilitates processing and installation.

[0091] like Figure 17 As shown, the bearing located within the cavity 10 is defined as the second bearing 62. The valve cavity 110 includes a first cavity 1101 and a second cavity 1102 located beside the first cavity 1101. The second cavity 1102 communicates with the first cavity 1101 and extends axially along the drive shaft 411. The valve core 2 is located within the first cavity 1101, and the second bearing 62 and at least a portion of the drive shaft 411 are located within the second cavity 1102.

[0092] A stepped portion 4113 is also formed on the drive shaft 411. The end wall of the second cavity 1102 away from the first bearing 61 is the second end wall, and the second bearing 62 is located between the stepped portion 4113 and the second end wall. In this way, the axial positioning of the second bearing 62 is achieved. It should be noted that the aforementioned positioning step 4112 and stepped portion 4113 can be a protrusion on the outer peripheral wall of the drive shaft 411, or it can be the end wall of a groove, that is, the drive shaft 411 is recessed inward to form grooves at the positions corresponding to each bearing.

[0093] like Figures 6-10 As shown, a stop structure 7 is provided between the valve body 1 and the valve core 2 to limit the rotation angle of the valve core 2. It can be understood that the presence of the stop structure 7 can limit the rotation angle of the valve core 2 to a limited range.

[0094] like Figures 6-10As shown, the cover 12 and the cover portion 13 together form the valve cover 14. The end wall of the valve cover 14 facing the valve core 2 is defined as the first end wall 141. In this embodiment, the stop structure 7 includes a first stop portion 1411 and a second stop portion 22. The first stop portion 1411 is disposed on the first end wall 141, and the second stop portion 22 is disposed on the peripheral wall of the valve core 2. The first stop portion 1411 is located on the rotation path of the second stop portion 22. When the first opening 210 is in the valve open position, one end of the second stop portion 22 abuts against the first end of the first stop portion 1411. When the first opening 210 is in the valve closed position, the other end of the second stop portion 22 abuts against the second end of the first stop portion 1411.

[0095] Specifically, such as Figure 6 As shown, the portion of the peripheral wall of the valve core 2, excluding the second stop portion 22, forms a slot 115 between it and the valve seat 11 for the first stop portion 1411 to be inserted. The slot 115 extends along the rotation direction of the valve core 2, so that when the valve core 2 rotates, the first stop portion 1411 is located on the rotation path of the second stop portion 22.

[0096] Both the first stop portion 1411 and the second stop portion 22 can be stop bars extending along the rotation direction of the valve core 2. Alternatively, the first stop portion 1411 can be an arc-shaped groove extending along the rotation direction of the valve core 2, and the second stop portion 22 can be an insertion portion inserted into the arc-shaped groove. Another option is that the second stop portion 22 is an arc-shaped groove extending along the rotation direction of the valve core 2, and the first stop portion 1411 is an insertion portion inserted into the arc-shaped groove.

[0097] In this embodiment, such as Figure 11 As shown, the cover portion 13 has a guide surface 130 on the side facing the second portion 124. The guide surface 130 gradually slopes away from the second portion 124 from the valve port 122 toward the second pipe hole 121. This allows for better guidance of the fluid and increases the smoothness of fluid flow.

[0098] like Figures 2-5 As shown, the sidewall of the cover portion 13 facing the valve core 2 is defined as the first sidewall 131. The seal 8 includes a sealing ring 81 that is annular and disposed on the first sidewall 131. When the first opening 210 is in the closed position, at least part of the sealing ring 81 abuts against the outer periphery of the first opening 210 and the first sidewall 131 to form a sealed connection between the outer periphery of the first opening 210 and the first sidewall 131. When the first opening 210 is in the open position, the channel connecting the flow channel 21 and the valve port 122 is defined as the fluid channel 15. The first opening 210 and the valve port 122 are not sealed to allow the fluid channel 15 to communicate with the valve chamber 110.

[0099] Understandably, when the valve is open, it is not sealed. The fluid channel 15 formed by the flow channel 21 and the valve port 122 is connected to the valve cavity 110, which reduces the risk of air stagnation in the valve cavity 110 and helps to maintain the pressure balance inside and outside the valve core 2, so as to ensure the balance of the rotation of the valve core 2, reduce the rotational torque of the valve core 2, thereby reducing the friction between the valve core 2 and the valve seat 11, extending the service life of the valve core 2, and improving the control accuracy of the rotation of the valve core 2.

[0100] In this embodiment, such as Figures 12-16 As shown, the sealing element 8 includes a first sealing section 811 and an annular body 83 located around the first sealing section 811. The two ends of the first sealing section 811 are connected to corresponding positions on the annular body 83. The annular body 83 is divided by the two ends of the first sealing section 811 to form a second sealing section 812 and a third sealing section 82 arranged opposite to each other. The sealing ring 81 is formed by connecting the first sealing section 811 and the second sealing section 812. Both the first sealing section 811 and the third sealing section 82 are located around the valve port 122. Thus, the sealing element 8 is a single integral component.

[0101] like Figure 13 As shown, the first sealing section 811 has a second through hole 8110 for the mounting shaft 3 to pass through. A plane passing through the axis of the mounting shaft 3 and parallel to the first sealing section 811 is defined as a third plane G. The third plane G divides the first sealing section 811 into a first sealing part 8111 and a second sealing part 8112. The first sealing part 8111 is arranged near the valve port 122. When the first opening 210 is in the closed position, the second sealing part 8112 and the second sealing section 812 abut against the outer periphery of the first opening 210. The width of the first sealing part 8111 is smaller than the width of the second sealing part 8112. Thus, when the first opening 210 is in the closed position, the contact area with the side of the first opening 210 near the valve port 122 can be maximized, thereby improving the sealing performance between the first opening 210 and the first sidewall 131.

[0102] Furthermore, the first area formed by the second sealing portion 8112 and the second sealing segment 812 is larger than the second area formed by the first sealing portion 8111 and the third sealing segment 82. Thus, when the first opening 210 is in the closed position, the contact area with the outer periphery of the first opening 210 is increased, thereby improving the sealing performance between the first opening 210 and the first sidewall 131. Since the second area formed by the second sealing portion 8112 and the second sealing segment 812 is smaller than the first area, the space of the valve port 122 can be utilized to the maximum extent, minimizing the outer diameter of the valve cover 14.

[0103] The end face of the valve core 2 with the first opening 210 is defined as the first end face 23. It should be noted that "first area" and "second area" refer to the "contact area" that is in contact with the valve core 2. For example, the first area refers to the sum of the area in contact between the second sealing part 8112 and the first end face 23 of the valve core 2 and the area in contact between the second sealing section 812 and the first end face 23 of the valve core 2, and does not include the area of ​​the cavity formed by the second sealing part 8112 and the second sealing section 812.

[0104] In a first manner to achieve a non-sealed connection between the first opening 210 and the valve port 122 when the first opening 210 is in the open position, the seal 8 is located beside the valve port 122, and the seal 8 is located on the cover portion 13 on one side of the valve port 122. The seal 8 consists only of a sealing ring 81 (i.e., the seal 8 is formed only by the sealing ring 81), and when the first opening 210 is in the open position, a gap is left between the valve port 122 and the corresponding position of the first end face 23 to form a fluid channel 15. In this embodiment, the seal 8 is generally semi-circular.

[0105] A second method for achieving a non-sealing connection between the first opening 210 and the valve port 122 when the first opening 210 is in the open position: (e.g.) Figures 12-14 As shown, the fluid passage 15 includes a vent groove 821, which is disposed on the side of the third sealing section 82 facing the valve core 2. Thus, even when the third sealing section 82 abuts against the outer periphery of the first opening 210 and the outer periphery of the valve port 122, the arrangement of the vent groove 821 can achieve communication between the flow passage 21, the valve port 122 and the valve chamber 110.

[0106] like Figure 14 As shown, the side of the sealing ring 81 facing the valve core 2 is defined as the first side 810, and the side of the third sealing section 82 facing the valve core 2 is defined as the second side 820. The first side 810 and the second side 820 are flush, so that the sealing element 8 always abuts between the end of the valve core 2 with the first valve port 122 and the valve cover 14.

[0107] Both the sealing ring 81 and the third sealing section 82 are always in contact with the first end face 23. This avoids severe wear caused by intermittent contact between the seal 8 and the first end face 23 of the valve core.

[0108] In this embodiment, such as Figure 2 , Figure 4 , Figure 7 and Figure 8As shown, the valve core 2 has a communicating channel 24 connected to the valve cavity 110. The first end face 23 also has an opening 231 connected to the communicating channel 24. The opening 231 is not connected to the first opening 210. The third sealing section 82 and the first sealing section 811 form an annular sealing body. When the first opening 210 is in the closed position, the opening 231 is connected to the valve port 122. When the first opening 210 is in the open position, the opening 231 is arranged opposite to the cover part 13. The mounting shaft 3 is provided on the first end face 23 and is located between the first opening 210 and the opening 231.

[0109] like Figure 12 As shown, at least one side of the vent groove 821, which is arranged circumferentially along the annular body 83, is provided with a first chamfer 8211. The presence of the first chamfer 8211 reduces the risk of wear on the third sealing section 82. In other embodiments, one side of the vent groove 821 is provided with the first chamfer 8211. In this embodiment, both sides of the vent groove 821 are provided with the aforementioned first chamfer 8211.

[0110] A second chamfer 8113 is provided on at least one of the inner and outer circumferences of the first sealing section 811 facing the valve core 2. The presence of the second chamfer 8113 provides guidance when the valve core 2 leaves and engages, reducing wear on the seal 8 during valve core 2 rotation. It also reduces the contact area, decreasing the axial pressure difference and the rotational torque of the valve core 2 while maintaining almost no reduction in the overall strength of the seal 8. This reduces friction, extends the service life of the valve core 2, and improves the control accuracy of the valve core 2's rotation.

[0111] A third method for achieving a non-sealing connection between the first opening 210 and the valve port 122 when the first opening 210 is in the open position: (e.g.) Figure 15 , Figure 16 Combination Figure 22 and Figure 23 As shown, the side of the sealing ring 81 facing the valve core 2 is defined as the first surface 810, and the side of the third sealing section 82 facing the valve core 2 is defined as the second surface 820. Along the length of the rotation axis of the valve core 2, the first surface 810 is located between the second surface 820 and the valve core 2, thus leaving a gap between the corresponding position of the second surface 820 and the first end face 23 to form the fluid channel 15. In this way, the second surface 820 of the third sealing section 82 does not abut against the first end face 23 of the valve core 2, but it can connect the first sealing section and the second sealing section, thereby strengthening the seal.

[0112] like Figure 10As shown, the first end wall 141 includes a first side wall 131, and the valve port 122 is located on the first end wall 141. Furthermore, the first end wall 141 has a first groove 1412 for accommodating the annular body 83 and a second groove 1413 for accommodating the first sealing section 811, with the first groove 1412 and the second groove 1413 communicating with each other. This facilitates the installation of the annular body 83 and the first sealing section 811. Moreover, since machining a circular groove is easier than machining a semi-circular groove, the presence of the third sealing section 82 allows the first groove 1412 to be easily machined directly into a circular groove.

[0113] Furthermore, such as Figure 11 , Figure 12 , Figure 14 , Figure 23 and Figure 24 As shown, a flange 832 is formed radially extending from the side of the annular body 83 away from the valve core 2. A receiving groove 1414 for receiving the flange 832 is also formed on the valve cover 14, and the receiving groove 1414 communicates with the first groove 1412. It can be understood that the presence of the flange 832 restricts the annular body 83 from dislodging from the valve cover 14, increasing the reliability of the seal 8 installation. In this embodiment, the flange 832 is formed by extending outward from the outer periphery of the annular body 83, in which case the receiving groove 1414 is located around the first groove 1412. In other embodiments, the flange 832 may also be formed by extending inward from the inner periphery of the annular body 83, in which case the first groove 1412 is located around the receiving groove 1414.

[0114] In addition, such as Figure 2 , Figure 4 , Figure 23 and Figure 24 As shown, a sealing ring 9 is provided inside the valve cavity 110. The sealing ring 9 is arranged away from the first opening 210 and is sleeved around the valve core 2 to form a sealed connection between the valve core 2 and the valve body 1. In this way, fluid flowing in through the pipe in the first pipe hole 111 can reliably flow into the flow channel 21, or fluid flowing out through the flow channel 21 can reliably flow out through the pipe in the first pipe hole 111.

[0115] 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 within the first connecting pipe hole 111. The end of the valve core 2 furthest from the first opening 210 abuts against the annular rib 114. The aforementioned sealing ring 9 is located between the annular rib 114 and the sealing ring 81.

[0116] like Figure 2 and Figure 4As shown, a third bearing 63 is provided between the inner peripheral wall of the valve core 2 and the valve body 1. Specifically, the third bearing 63 is located on the periphery of the valve core 2 within the valve cavity 110, between the sealing ring 9 and the sealing ring 81. It can be understood that the presence of the third bearing 63 improves the rotational accuracy of the valve core 2 and reduces friction.

[0117] like Figure 2 and Figure 4 As shown, the pipe wall of the flow channel 21 includes a first section 211 and a second section 212 connected sequentially along the second direction Y. The flow channel 21 extends along the second direction Y. The end of the second section 212 away from the first section 211 is open, which is the first opening 210. The cross-section of the first section 211 is circular. The aforementioned sealing ring 9 and the third bearing 63 are both fitted around the periphery of the first section 211. The second section 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 section 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 section 211 and the second section 212, allowing the fluid to flow more smoothly within the flow channel 21 and ensuring flow capacity. In addition, the first region 2121 gradually slopes from the end of the first section 211 towards the direction away from the second region 2122 along the second direction Y.

[0118] like Figure 2 , Figure 4 and Figure 13 As shown, the sealing ring 9 is sleeved around the first segment 211. The sealing area of ​​the valve core 2 at the sealing ring 9 is the same as or basically the same as the sealing area at the sealing ring 81. That is, 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 basically the same.

[0119] 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, that is, the axial pressure difference caused by the pressure difference between the inside and outside of the valve core 2 during sealing is reduced.

[0120] 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.

[0121] 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 116 for accommodating 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.

[0122] 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.

[0123] It should be noted that the first sealing area mentioned above is the area enclosed by the sealing ring.

[0124] Furthermore, such as Figure 13 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 and the opposite direction along its own axial direction. It can be understood that the preload force will always be greater than the pressure difference force in the positive and negative directions, ensuring that the valve core 2 has sufficient sealing effect. At the same time, it significantly reduces the friction force generated by the pressure difference force, thereby reducing the rotational torque of the valve core 2, thus reducing the friction between the valve core 2 and the valve seat 11, extending the service life of the valve core 2, and improving the control accuracy of the rotation of the valve core 2.

[0125] 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.

[0126] 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.

[0127] 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 by include: A valve body (1) has a cavity (10) inside. A valve port (122) is provided in the cavity (10). The valve body (1) has a first connecting hole (111), a cover (13) and a second connecting hole (121). The first connecting hole (111) and the second connecting hole (121) are coaxially arranged. The valve port (122) is located between the first connecting hole (111) and the second connecting hole (121) and is connected to the connecting pipe in the second connecting hole (121). The axis of the valve port (122) is parallel to the axis of the second connecting hole (121). The cover (13) is at least partially located in the cavity (10) and is located beside the valve port (122). A 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) 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) and blocked by the cover (13).

2. The valve device of claim 1, wherein: The inner peripheral wall of the valve body (1) 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 covering part (13) includes at least the extension (1231).

3. The valve device of claim 2, wherein: The valve body (1) includes a valve seat (11) and a cover (12) connected in sequence and arranged coaxially. The first connecting hole (111) is located at the end of the valve seat (11) away from the cover (12), and the second connecting hole (121) is located at the end of the cover (12) away from the valve seat (11). The cavity (10) includes a valve cavity (110) located in the valve seat (11), and the valve core (2) is located in the valve cavity (110). The first part (123) and the second part (124) are both located on the cover (12).

4. The valve device of claim 3, wherein A stop structure (7) is provided between the valve body (1) and the valve core (2) to limit the rotation angle of the valve core (2).

5. The valve device of claim 4, wherein The cover (12) and the cover (13) together form a valve cover (14). The end wall of the valve cover (14) facing the valve core (2) is defined as the first end wall (141). The stop structure (7) includes a first stop part (1411) and a second stop part (22). The first stop part (1411) is disposed on the first end wall (141), and the second stop part (22) is disposed on the peripheral wall of the valve core (2). The first stop part (1411) is located on the rotation path of the second stop part (22). When the first opening (210) is in the valve open position, one end of the second stop part (22) abuts against the first end of the first stop part (1411). When the first opening (210) is in the valve closed position, the other end of the second stop part (22) abuts against the second end of the first stop part (1411).

6. The valve device of claim 1, wherein 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 valve body (1) through 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).

7. The valve device of claim 6, wherein 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 connected to the valve core (2) through the transmission assembly (42). The drive shaft (411) and the mounting shaft (3) are at an angle to each other.

8. The valve device of claim 7, wherein The transmission assembly (42) is located inside 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 part of the drive shaft (411) is located inside the cavity (10). The transmission part is provided on the drive shaft (411) and is in transmission cooperation with the gear (421).

9. The valve device of claim 7, wherein The driver (41) includes a connecting seat (410), which has a first through hole (4101) through which the drive shaft (411) passes. The connecting seat (410) is welded and fixed to the outer wall of the valve body (1).

10. The valve device of claim 1, wherein The sidewall of the cover (13) facing the valve core (2) is defined as the first sidewall (131). The first sidewall (131) is provided with an annular sealing ring (81). 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). The valve core (2) is located in the valve cavity (110). The valve port (122) and the cover (13) are both located on the cover (12) near the valve core (2). At one end of the valve seat (11), when the first opening (210) is in the closed position, at least a portion of the sealing ring (81) abuts against the outer periphery 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); when the first opening (210) is in the open position, the channel connecting the flow channel (21) and the valve port (122) is defined as the fluid channel (15), and the first opening (210) and the valve port (122) are connected in a non-sealed manner so that the valve cavity (110) is connected to the fluid channel (15).

11. The valve device of claim 1, wherein A sealing ring (9) is provided at one end of the valve core (2) away from the second connecting hole (121). 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 body (1). The side wall of the cover (13) facing the valve core (2) is defined as the first side wall (131). The first side wall (131) is provided with a sealing ring (81). When the first opening (210) 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 side wall (131) to form a sealed connection between the first opening (210) and the first side wall (131).

12. The valve device of claim 11, wherein, A third bearing (63) is provided between the valve core (2) and the inner peripheral wall of the valve body (1), and the third bearing (63) is located between the sealing ring (9) and the sealing ring (81).

13. The valve device of claim 11, wherein, 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 is the same as or substantially the same as the second sealing area S.

14. The valve device of claim 13, wherein The inner peripheral wall of the valve body (1) is provided with a first annular groove (116) for accommodating the sealing ring (9), and the sealing area of the valve core (2) at the sealing ring (9) is defined as a first sealing area S1, S1=0.25πd 2 , d is the inner diameter of the sealing ring (9); Or, the outer peripheral wall of the valve core (2) is provided with a second annular groove accommodating the sealing ring (9), and the sealing area of the valve core (2) at the sealing ring (9) is defined as a first sealing area S1, S1=0.25πd 2 , d is the outer diameter of the sealing ring (9).

15. The valve device of claim 14, wherein The overall area enclosed by the outer periphery of the sealing ring (81) is S2, and the overall area enclosed by the inner periphery of the sealing ring (81) is S3. The second sealing area S satisfies: S3 < S < S2. The preload force F between the valve core (2) and the sealing ring (81) 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.

16. The valve device according to any one of claims 1 to 15, characterized in that The wall of 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).

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