Control valve and method of manufacturing the same

Abstract

This invention discloses a control valve and its manufacturing method. The control valve includes a valve body and a valve core. The valve core includes a top plate, a bottom plate, a first stop block, and a valve core shaft assembly. The valve core shaft assembly includes a transmission connection portion, at least a portion of which is located on the side of the top plate away from the bottom plate. The first stop block is fixedly connected to the top plate as an integral structure and extends from the top plate away from the bottom plate. The valve body also includes a top wall portion and a second stop block located at one end of the side wall portion in the height direction. The top wall portion and the side wall portion are integrally formed. The top wall portion has a through hole that communicates with the valve cavity. At least a portion of the transmission connection portion passes through the through hole and is located outside the valve body. The second stop block is located in the valve cavity and protrudes from the top wall portion. The second stop block is fixedly connected to the top wall portion as an integral structure. When the valve core rotates to a predetermined position, the first stop block and the second stop block abut against each other and restrict the valve core from continuing to rotate toward the second stop block. This enables the valve core to be positioned relatively accurately and reduces the degree of deformation of the valve core.

Description

Technical Field

[0001] This invention relates to the field of fluid control, and more specifically to a control valve and its manufacturing method. Background Technology

[0002] Typically, the valve core of a control valve rotates under the drive of a driving component to achieve fluid control of multiple flow paths. How to make the rotation position of the valve core relatively accurate and reduce the deformation of the valve core is an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide a control valve that makes the valve core position relatively accurate and reduces the degree of valve core deformation.

[0004] On one hand, embodiments of the present invention provide a control valve, including a valve body and a valve core. The valve body includes a side wall portion, and the control valve has a valve cavity. The side wall portion forms the peripheral wall of the valve cavity or is at least a part of the peripheral wall. The valve core is rotatable under drive. The valve core includes a top plate, a bottom plate, a first stop block, and a valve core shaft assembly. The top plate and the bottom plate are arranged along the height direction of the valve core, and both the top plate and the bottom plate are sleeved on the outer peripheral side of the valve core shaft assembly. The valve core shaft assembly includes a transmission connection portion. At least a portion of the transmission connection portion is located on the side of the top plate away from the bottom plate. The transmission connection portion can drive the valve core to rotate. The first stop block is fixedly connected to the top plate as an integral structure, and the first stop block extends from the top plate away from the bottom plate.

[0005] The valve body further includes a top wall portion and a second stop block located at one end of the side wall portion in the height direction. The top wall portion and the side wall portion are integrally formed. The valve cavity is located between the top wall portion and the side wall portion. The top wall portion has a through hole that communicates with the valve cavity. At least a portion of the transmission connection portion passes through the through hole and is located outside the valve body. The second stop block is located in the valve cavity and protrudes from the top wall portion. The second stop block is fixedly connected to the top wall portion as an integral structure. When the valve core rotates to a predetermined position, the first stop block abuts against the second stop block and restricts the valve core from continuing to rotate toward the second stop block.

[0006] On the other hand, embodiments of the present invention also provide a method for manufacturing a control valve, comprising:

[0007] A valve core, valve body, sealing ring, and bottom cover are provided. The valve core includes a valve core shaft assembly, which includes a first valve core shaft and a second valve core shaft. The first valve core shaft includes a first connecting portion, and the second valve core shaft includes a second connecting portion, a stepped portion, and a transmission connecting portion. The transmission connecting portion and the second connecting portion are arranged along the height direction of the second valve core shaft. The stepped portion is located on the outer periphery of the second connecting portion and has a stepped surface. The valve body includes a side wall portion and a top wall portion. The top wall portion is integrally formed with the side wall portion. The control valve has a valve cavity. The top wall portion is located at one end of the side wall portion, and the other end of the side wall portion has an opening communicating with the valve cavity. The top wall portion has a through hole penetrating the top wall portion and communicating with the valve cavity.

[0008] Forming a valve core assembly includes assembling a first valve core shaft, a second valve core shaft, and a sealing ring, so that the first connecting part and the second connecting part are connected in a driving manner, wherein the sealing ring is sleeved on the outer peripheral side of the second valve core shaft and contacts the stepped surface or has a gap with the stepped surface;

[0009] The valve core assembly is inserted into the valve cavity through the opening, with at least a portion of the drive connection passing through the through hole and located outside the valve body;

[0010] The bottom cover is fixedly connected to the end of the side wall portion away from the top wall portion and sealed.

[0011] According to the control valve and its manufacturing method provided in the embodiments of the present invention, by setting a first stop on the valve core and a second stop on the valve body, when the valve core is at a predetermined rotation position, the first stop and the second stop abut against each other and restrict the valve core from continuing to move toward the second stop. This forms a position reference between the valve core and the valve body, making the rotation position of the valve core more accurate and improving the control precision of the control valve. The valve core includes a transmission connection part, which can be connected to a drive device to drive the valve core to rotate. The first stop is fixedly connected to a top plate near the transmission connection part, and the second stop is fixedly connected to a top wall near the transmission connection part. When the first stop and the second stop abut against each other, the first stop is closer to the transmission connection part and the drive device, and the driving force arm is smaller, which can reduce the degree of torsional deformation of the valve core and improve the operational stability of the control valve. Attached Figure Description

[0012] Figure 1 This is an exploded structural diagram of a control valve provided in one embodiment of the present invention;

[0013] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the control valve at one of its locations.

[0014] Figure 3 This is a partial structural schematic diagram of a valve body provided in one embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of the valve core provided in one embodiment of the present invention;

[0016] Figure 5 yes Figure 4 A partial structural schematic diagram of the valve core is shown in the figure;

[0017] Figure 6 yes Figure 3 The diagram shows a partial cross-sectional view of the valve body.

[0018] Figure 7 yes Figure 6 The diagram shows an enlarged view of the valve body at point Q1.

[0019] Figure 8 yes Figure 1 The diagram shows a front view of a portion of the control valve's structure.

[0020] Figure 9 yes Figure 8 The control valve shown in the figure is a cross-sectional view along the AA direction;

[0021] Figure 10 yes Figure 9 The diagram shows the structure of the control valve at Q2.

[0022] Figure 11 yes Figure 4 The diagram shows a front view of the valve core.

[0023] Figure 12 yes Figure 11 The cross-sectional view of the valve core along the BB direction is shown in the figure;

[0024] Figure 13 yes Figure 12 The diagram shows an enlarged view of the valve core at Q3.

[0025] Figure 14 This is a schematic diagram of the structure of the second valve spindle provided in one embodiment of the present invention;

[0026] Figure 15 yes Figure 14 The diagram shows a cross-sectional view of the second valve spindle.

[0027] Figure 16 This is a schematic flowchart of a method for manufacturing a control valve according to an embodiment of the present invention. Detailed Implementation

[0028] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. In this document, relational terms such as "first" and "second" are used merely to distinguish one component from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0029] like Figures 1 to 3 As shown, an embodiment of the present invention provides a control valve 1, including a valve body 10, a valve core 20, and a first sealing member 41. The valve body 10 includes a side wall portion 11, and the control valve 1 has a valve cavity 101. The side wall portion 11 forms the peripheral wall of the valve cavity 101 or at least a part of the peripheral wall. The first sealing member 41 is located between the valve core 20 and the side wall portion 11. The valve core 20 can rotate under a drive. The control valve 1 may also include a drive device 50 and a sealing ring 43. The drive device 50 includes a drive member, which may be a motor or a combination of a motor and a reduction gear set. The valve core 20 can rotate under the drive of the drive member in the drive device 50. Figure 1 In the valve body 10, there are also bottom cover 12 and top wall 13. Bottom cover 12 and valve cavity 101 are located between top wall 13 and side wall 11. Top wall 13 and side wall 11 are integrally formed. Sealing ring 43 is located between top wall 13 and valve core 20. At least part of side wall 11 is located between bottom cover 12 and top wall 13. Bottom cover 12 can be fixedly connected to side wall 11 by welding process and sealed to prevent fluid leakage. Since at least part of valve core 20 passes through top wall 13 and is located outside valve body 10 for transmission connection with drive device 50, by setting sealing ring 43 between top wall 13 and valve core 20, fluid can be prevented from leaking from top wall 13, thus improving the sealing performance of control valve 1. The control valve 1 may include at least five channels 30, one end of each channel 30 passing through the side wall portion 11 and communicating with the valve chamber 101, and the other end of each channel 30 forming a valve port 102 of the control valve 1, through which fluid can enter or leave the control valve 1.

[0030] To facilitate the assembly of control valve 1 with other components in the fluid control system and improve the integration of control valve 1 with other components, in some embodiments, such as Figures 1 to 3The valve body 10 also includes a mounting portion 14, which is fixedly connected to the side wall portion 11 and located on the side of the side wall portion 11 away from the valve cavity 101. For example, the mounting portion 14 and the side wall portion 11 can be integrally formed. The mounting portion 14 has a mounting plane 141, through which the valve port 102 of the control valve 1 passes. This ensures that all valve ports 102 of the control valve 1 are arranged on the mounting plane 141 and that all valve ports 102 face the same direction. This simplifies the assembly steps of the control valve 1 with other components and reduces leakage points at the connection points, thereby increasing the reliability of the seal. In some embodiments, the first sealing member 41 includes a through hole 411 that corresponds to and communicates with at least a portion of the channel 30 of the control valve 1. The first sealing member 41 is deformed by the compression of the valve core 20 and the side wall portion 11, thereby achieving the sealing of the control valve 1 by the first sealing member 41. It is understood that the passage of the control valve 1 can also be arranged circumferentially along the side wall portion 11, and the valve port 102 can also be arranged circumferentially along the side wall portion 11. The present invention does not limit this.

[0031] Further reading Figure 1 and Figure 2 The first seal 41 has an arc-shaped cross-section. During the process of the valve core 20 pressing the first seal 41, it is easy to cause the valve core 20 to become eccentric, which can affect the rotation of the valve core 20. Therefore, in some embodiments, the control valve 1 may also include a second seal 42. The second seal 42 and the first seal 41 are respectively disposed on both sides of the valve core 20 in the radial direction, so that the second seal 42 and the first seal 41 both exert force on the valve core 20, keeping the valve core 20 coaxial with the side wall 11 and improving the stability of the rotation of the valve core 20.

[0032] Combination Figure 1 , Figure 4 and Figure 5 As shown, the valve core 20 has multiple external conductive cavities 25. Each external conductive cavity 25 is a groove structure formed by the side surface of the valve core 20 recessing into the interior of the valve core 20. During the rotation of the valve core 20, the corresponding two valve ports 102 can be opened and / or closed through at least a portion of the external conductive cavities 25. Furthermore, the valve core 20 may also include an internal conductive cavity 26. Multiple external conductive cavities 25 are distributed on the outer periphery of the internal conductive cavity 26. The internal conductive cavity 26 communicates with a portion of the external conductive cavities 25, so that during the rotation of the valve core 20, the corresponding two valve ports 102 can be opened and / or closed through the external conductive cavities 25 and the internal conductive cavity 26, thereby realizing the control function of the control valve 1 on the fluid.

[0033] Furthermore, the valve core 20 includes a top plate 201, a bottom plate 202, a first partition 23, a second partition 24, a first stop block 203, and a valve core shaft assembly SA. The first partition 23 has a connecting hole, and the internal conducting cavity 26 is connected to a number of external conducting cavities 25 through the connecting hole. Each external conducting cavity 25 is separated into an independent space by the second partition 24. The cross-sectional area of ​​the cavity opening of the external conducting cavity 25 can be different. For example, the external conducting cavity 25 may include a first cavity 251 and a second cavity 252. The cross-sectional area of ​​the cavity opening of the first cavity 251 is greater than or equal to twice the cross-sectional area of ​​the cavity opening of the second cavity 252. At this time, the first cavity 251 can conduct and / or cut off the two valve ports 102 corresponding to the first cavity 251. The internal conducting cavity 26 is connected to a number of second cavities 252 through the connecting hole, so that the internal conducting cavity 26 and the second cavity 252 can conduct and / or cut off the two valve ports 102 corresponding to the two cavities. The top plate 201 and bottom plate 202 of the valve core 20 are arranged along the height direction of the valve core 20. The external guiding cavity 25 is located between the top plate 201 and the bottom plate 202, and both the top plate 201 and the bottom plate 202 are sleeved on the outer periphery of the valve core shaft assembly SA. The valve core shaft assembly SA includes a transmission connection part 222, at least a portion of which protrudes from the top plate 201 and is located on the side of the top plate 201 opposite to the bottom plate 202. Figure 1 The valve core 20 is connected to the drive device 50 via the transmission connection 222, allowing the drive device 50 to rotate the valve core 20. The first stop 203 protrudes from the top plate 201 and is fixedly connected to it as an integral structure. The drive device 50 is positioned close to the top plate 201, and the first stop 203 extends from the top plate 201 away from the bottom plate 202. This first stop 203 limits the rotational position of the valve core 20. In this embodiment, the first stop 203 is fixedly connected to the top plate 201 near the transmission connection 222. When limiting the rotational position of the valve core 20, the first stop 203 is close to the transmission connection 222 and the drive device 50, resulting in a smaller driving force arm. This reduces the torsional deformation of the valve core 20 and improves the operational stability of the control valve 1. Optionally, the valve core 20 may also include a reinforcing rib 27, which is connected between the first partition 23 and the first valve core shaft 21.

[0034] like Figures 6 to 10 As shown, the valve body 10 also includes a top wall portion 13 and a second stop 15 located at one end of the side wall portion 11 in the height direction. The top wall portion 13 and the side wall portion 11 are integrally formed and enclose the valve cavity 101. The top wall portion 13 has a through hole 131, which communicates with the valve cavity 101. The second stop 15 is located in the valve cavity 101 and protrudes from the top wall portion 13. At least a portion of the transmission connection portion 222 of the valve spindle assembly SA passes through the through hole 131 and is located outside the valve body 10, such as... Figure 9As shown, the transmission connection 222 is entirely located outside the valve body 10. The second stop 15 is fixedly connected to the top wall 13 as an integral structure. For example, the second stop 15 can be integrally formed with the top wall 13. Figure 2 When the valve core 20 rotates to the predetermined position, the first stop 203 abuts against the second stop 15 and restricts the valve core 20 from continuing to rotate toward the second stop 15. In this way, the first stop 203 and the second stop 15 can form a position reference between the valve core 20 and the valve body 10, making the rotation position of the valve core 20 more accurate, thereby improving the control accuracy of the control valve 1. Moreover, the side wall portion 11, the top wall portion 13 and the second stop 15 can be integrally formed, so that the structural strength of the valve body 10 is improved when the first stop 203 abuts against the second stop 15. Compared with the side wall portion 11 and the top wall portion 13 being separately set and welded, the structure of this embodiment can prevent the weld between the side wall portion 11 and the top wall portion 13 from cracking.

[0035] like Figures 10 to 15 As shown, to improve the structural strength of the valve core 20, in some embodiments, the valve core shaft assembly SA includes a first valve core shaft 21 and a second valve core shaft 22. The strength of the second valve core shaft 22 is greater than that of the first valve core shaft 21. The first valve core shaft 21 includes a first connecting portion 211, which is located at one end of the first valve core shaft 21 and at least partially located in the valve cavity 101. The second valve core shaft 22 includes a transmission connecting portion 222 and a second connecting portion 221. The transmission connecting portion 222 of the valve core shaft assembly SA is disposed on the second valve core shaft 22. At one end of the second valve spindle 22, the second valve spindle 22 further includes a second connecting portion 221. The second connecting portion 221 and the transmission connecting portion 222 are arranged along the height direction of the second valve spindle 22, with at least a portion of the second connecting portion 221 located in the valve cavity 101 and at least a portion of the transmission connecting portion 222 located outside the valve cavity 101 and protruding from the top wall portion 13. The inner surface of one of the second connecting portion 221 and the first connecting portion 211 has a toothed shape, and the outer surface of the other has a toothed shape. The toothed shape of the second connecting portion 221 meshes with the toothed shape of the first connecting portion 211. With the above arrangement, the first valve spindle 21 and the second valve spindle 22 can rotate synchronously while improving the structural strength of the valve core 20.

[0036] Optionally, such as Figures 12 to 15As shown, to improve the torsional strength of the valve core 20 during rotation, the valve core 20 may include a first helical reinforcing rib 213, a second helical reinforcing rib 214, and a third helical reinforcing rib 224. The first helical reinforcing rib 213 is located between the outer surface of the first valve core shaft 21 and the inner surface of the first partition 23. The second helical reinforcing rib 214 is located within the cavity enclosed by the inner surface of the first valve core shaft 21. The third helical reinforcing rib 224 may be located within the cavity enclosed by the inner surface of the second valve core shaft 22. In a specific implementation, the first helical reinforcing rib 213, the second helical reinforcing rib 214, and the third helical reinforcing rib 224 are helical extension structures. The first helical reinforcing rib 213, the second helical reinforcing rib 214, the first valve core shaft 21, the first partition 23, and the second partition 24 can be integrally injection molded, and the third helical reinforcing rib 224 can be integrally molded with the second valve core shaft 22.

[0037] In a specific implementation, the inner surface of the second connecting portion 221 of the second valve spindle 22 has a toothed structure, and the outer surface of the first connecting portion 211 of the first valve spindle 21 has a toothed structure. The meshing of the toothed structures enables the transmission connection between the first valve spindle 251 and the second valve spindle 22, allowing the first valve spindle 251 and the second valve spindle 252 to rotate synchronously. Optionally, the first valve spindle 21 can be composed of a combination of polyamide-66 (PA66) and glass fiber (GF), or a combination of polyphthalamide (PPA) and glass fiber (GF), or polyphenylene sulfide (PPS). The second valve spindle 22 can be composed of metal, polyphenylene sulfide (PPS), or a combination thereof.

[0038] To improve the stability of the transmission connection between the first valve spindle 21 and the second valve spindle 22, in some embodiments, the output torque of the control valve 1 is 3.5 Nm to 4.5 Nm, at which time the input torque of the valve spindle assembly SA is 3.5 Nm to 4.5 Nm, and the length of the meshing portion of the teeth of the second connecting part 221 and the teeth of the first connecting part 211 is 10 mm to 15 mm.

[0039] In some embodiments, the coefficient of linear expansion of the second valve spindle 22 is less than or equal to the coefficient of linear expansion of the first valve spindle 21, resulting in minimal dimensional change of the second valve spindle 22 at different ambient temperatures. This allows the control valve 1 to be suitable for various temperature environments, improving its applicability. Further reference Figure 10The second valve spindle 22 includes a stepped portion 223, which is fixedly connected to the second connecting portion 221. Along the height direction of the second valve spindle 22, the orthographic projection of the second connecting portion 221 is located inside the orthographic projection of the stepped portion 223. The stepped portion 223 has a stepped surface 2231, which is opposite to and has a gap with the top wall portion 13. The stepped surface 2231 is located in the valve cavity 101. When the control valve 1 also includes a sealing ring 43, the sealing ring 43 is coaxial with the through hole 131 of the top wall portion 13. The sealing ring 43 is sleeved on the outer periphery of the second valve spindle 22 and located within the gap between the stepped surface 2231 of the second valve spindle 22 and the inner surface of the top wall portion 13. By setting the linear expansion coefficient of the second valve spindle 22 to be less than or equal to the linear expansion coefficient of the first valve spindle 21, the dimensional change of the second valve spindle 22 can be minimized at the ambient temperature, thereby reducing the deformation of the sealing ring 43 and improving the sealing performance of the control valve 1.

[0040] like Figure 7 and Figure 10 As shown, in some embodiments, the valve body 10 further includes a guide portion 16 extending from the top wall portion 13 into the valve cavity 101. The guide portion 16 has a guide channel 161 penetrating the guide portion 16. The guide channel 161 is coaxial with and communicates with the through hole 131 of the top wall portion 13. Along the direction close to the top wall portion 13, the aperture of the inner wall surface of the guide channel 161 decreases. The sealing ring 43 is located inside the guide channel 161. By setting the aperture of the inner wall surface of the guide channel 161 to decrease, the inner wall surface of the guide channel 161 can guide the assembly of the sealing ring 43 when it is assembled into the valve body 10, facilitating the installation of the sealing ring 43 and improving the accuracy of the installation position of the sealing ring 43.

[0041] Combination Figure 1 , Figure 2 , Figure 4 , Figure 8 and Figure 9As shown, in some embodiments, when the control valve 1 further includes a drive device 50, the drive device 50 is located on the side of the top wall portion 13 away from the valve cavity 101. The drive device 50 includes a drive member, which is connected to the transmission connection portion 222. At this time, the first stop 203 and the second stop 15 are both close to the drive device 50, so that when the valve core 20 rotates to the point where the first stop 203 and the second stop 15 abut, the driving force arm of the valve core 50 is small, thereby reducing the torsional deformation of the valve core 20. The valve body 10 also includes a bottom cover 12, which is located on the side of the side wall portion 11 opposite to the top wall portion 13. The bottom cover 12 is fixedly and sealed to the side wall portion 11. The bottom cover 12 includes a bottom wall portion 121 and a limiting portion 122. The limiting portion 122 protrudes from the bottom wall portion 121 and is located within the valve cavity 101. The valve core shaft assembly SA also includes a support portion 212, which is located at one end of the first valve core shaft 21 and on the side of the bottom plate 202 of the valve core 20 opposite to the top plate 201. The support portion 212 is limitedly connected to the limiting portion 122. Through the above arrangement, the installation position of the valve core 20 is accurate, improving the stability of the rotation of the valve core 20.

[0042] In summary, according to the control valve 1 provided in the embodiments of the present invention, by providing a first stop 203 on the valve core 20 and a second stop 15 on the valve body 10, when the valve core 20 is at a predetermined rotational position, the first stop 203 and the second stop 15 abut against and restrict the valve core 20 from continuing to move toward the second stop 15. This forms a position reference between the valve core 20 and the valve body 10, making the rotational position of the valve core 20 more accurate, thereby improving the control accuracy of the control valve 1; the valve core 20 includes a transmission connection portion 222, the transmission connection portion 222... 22 can be connected to the drive device 50 to drive the valve core 20 to rotate. The first stop 203 is fixedly connected to the top plate 201 near the transmission connection part 222, and the second stop 15 is fixedly connected to the top wall part 13 near the transmission connection part 222. When the first stop 203 and the second stop 15 come into contact, the first stop 203 is closer to the transmission connection part 222 and the drive device 50, and the driving force arm it receives is smaller. This can reduce the degree of torsional deformation of the valve core 20 and improve the operating stability of the control valve 1.

[0043] like Figure 16 This invention also provides a method for manufacturing a control valve, combined with... Figures 1 to 15 The manufacturing methods of control valves include:

[0044] S110 provides a valve core 20, a valve body 10, a sealing ring 43, and a bottom cover 12.

[0045] The valve core 20 includes a valve core shaft assembly SA, a first valve core shaft 21 and a second valve core shaft 22. The first valve core shaft 21 includes a first connecting portion 211, and the second valve core shaft 22 includes a second connecting portion 221, a step portion 223 and a transmission connecting portion 222. The transmission connecting portion 222 and the second connecting portion 221 are arranged along the height direction of the second valve core shaft 22. The step portion 223 is located on the outer periphery of the second connecting portion 221 and the two are fixedly connected. The step portion 223 has a step surface 2231, which can be perpendicular to the height direction of the second valve core shaft 22. The valve body 10 includes a side wall portion 11 and a top wall portion 13. The control valve 1 has a valve cavity 101. The top wall portion 13 is integrally formed with the side wall portion 11 and defines the valve cavity 101. The top wall portion 13 is located at one end of the side wall portion 11, and the other end of the side wall portion 11 has an opening 111 communicating with the valve cavity 101. The top wall portion 13 has a through hole 131 penetrating the top wall portion 13 and communicating with the valve cavity 101. The structure of the valve body 10 and valve core 20 in this embodiment is the same as the structure of the valve body 10 and valve core 20 provided in any of the above embodiments, and will not be described again.

[0046] S120, forming the valve core assembly.

[0047] In this embodiment, step S120 includes assembling the first valve spindle 21, the second valve spindle 22, and the sealing ring 43, so that the first connecting part 211 and the second connecting part 221 are connected in a transmission manner. The sealing ring 43 is sleeved on the outer peripheral side of the second valve spindle 22 and contacts the stepped surface 2231 or has a gap with the stepped surface 2231. Optionally, the inner diameter of the sealing ring 43 is smaller than the outer diameter of the second valve spindle 22, so that the sealing ring 43 is stably confined to the second valve spindle 22.

[0048] S130, The valve core assembly is inserted into the valve cavity 101 through the opening 111 and at least a portion of the transmission connection 222 passes through the through hole 131 and is located outside the valve body 10.

[0049] S140, The bottom cover 12 is fixedly connected to the end of the side wall portion 11 away from the top wall portion 13 and sealed.

[0050] When the control valve 1 includes a first seal 41 and a second seal 42, before step S130, in which the valve core assembly is inserted into the valve cavity 101 through the opening 111 and at least a portion of the transmission connection 222 passes through the through hole 131 and is located outside the valve body 10, the first seal 41 and the second seal 42 can be installed into the valve cavity 101 first, so that the control valve 1 has better sealing performance. The control valve manufactured by the above-described control valve manufacturing method has the same beneficial effects as the control valve provided in any of the above embodiments, and can reduce the deformation of the sealing ring 43, which will not be described in detail here.

[0051] In some embodiments, the bottom cover 12 includes a bottom wall portion 121 and a limiting portion 122, the limiting portion 122 protruding from the bottom wall portion 121. The first valve spindle 21 has a support portion 212, the support portion 212 being located at one end of the first valve spindle 21, and the first connecting portion 211 being located at the other end of the first valve spindle 21. In this case, step S140, fixing and sealing the bottom cover 12 to the end of the side wall portion 11 away from the top wall portion 13, includes: limiting the connection between the support portion 212 and the limiting portion 122; and fixing and sealing the bottom cover 12 and the side wall portion 11 through a welding process. In specific implementations, a laser welding process can be used to weld a complete circle around the bottom cover 12 and the side wall portion 11 to fix and seal them together.

[0052] To ensure a stable transmission connection between the first valve spindle 21 and the second valve spindle 22, thereby better transmitting the driving torque and preventing breakage of the first valve spindle 21 and / or the second valve spindle 22, in some embodiments, the inner surface of one of the second connecting portion 221 and the first connecting portion 211 has a toothed shape, and the outer surface of the other has a toothed shape. In this case, step S120, forming the valve core assembly, includes: forming the second valve spindle assembly, including fitting a sealing ring 43 onto the outer periphery of the second valve spindle 22 and making the sealing ring 43 contact or spaced from the stepped surface 2231, wherein the inner diameter of the sealing ring 43 is smaller than the outer diameter of the stepped surface 2231; and meshing the toothed shape of the second connecting portion 221 with the toothed shape of the first connecting portion 211 such that the length of the meshing portion is 10 mm to 15 mm.

[0053] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. For example, the directional definitions such as "front", "back", "left", "right", "up", and "down" are used. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify, combine or make equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A control valve comprising a valve body and a valve core, said valve body comprising a side wall portion, said control valve having a valve chamber, said valve core being able to be rotated under the influence of a drive, characterized in that, The valve core includes a top plate, a bottom plate, a first stop block, and a valve core shaft assembly. The top plate and the bottom plate are arranged along the height direction of the valve core, and both the top plate and the bottom plate are located on the outer periphery of the valve core shaft assembly. The valve core shaft assembly includes a transmission connection part, at least a portion of which is located on the side of the top plate away from the bottom plate. The transmission connection part can drive the valve core to rotate. The first stop block is fixedly connected to the top plate as an integral structure, and the first stop block extends from the top plate away from the bottom plate. The valve body further includes a top wall portion and a second stop block located at one end of the side wall portion in the height direction. The top wall portion and the side wall portion are integrally formed. The valve cavity is located between the top wall portion and the side wall portion. The top wall portion has a through hole that communicates with the valve cavity. At least a portion of the transmission connection portion passes through the through hole and is located outside the valve body. The second stop block is located in the valve cavity and protrudes from the top wall portion. The second stop block is fixedly connected to the top wall portion as an integral structure. When the valve core rotates to a predetermined position, the first stop block abuts against the second stop block and restricts the valve core from continuing to rotate toward the second stop block. The valve spindle assembly includes a first valve spindle and a second valve spindle, the second valve spindle having a greater strength than the first valve spindle. The first valve spindle includes a first connecting portion located at one end of the first valve spindle and at least partially located in the valve cavity. The second valve spindle includes the transmission connecting portion and also includes a second connecting portion. The second connecting portion and the transmission connecting portion are arranged along the height direction of the second valve spindle, with at least a portion of the second connecting portion located in the valve cavity. At least a portion of the transmission connecting portion is located outside the valve cavity and protrudes from the top wall portion. The second valve spindle includes a stepped portion with a stepped surface located in the valve cavity and opposite to the top wall portion. The inner surface of the second connecting portion has a toothed shape, and the outer surface of the first connecting portion has a toothed shape. The toothed shape of the second connecting portion meshes with the toothed shape of the first connecting portion. The control valve also includes a sealing ring coaxial with the through hole of the top wall portion. The sealing ring is sleeved on the outer periphery of the second valve spindle and located between the stepped surface of the second valve spindle and the top wall portion.

2. The control valve according to claim 1, characterized in that The first valve core is composed of a combination of polyamide 66 and glass fiber, or a combination of polyphthalamide and glass fiber, or polyphenylene sulfide. The second valve spindle is composed of materials including metal, polyphenylene sulfide, or a combination thereof.

3. The control valve of claim 1, wherein The coefficient of linear expansion of the second valve spindle is less than or equal to that of the first valve spindle.

4. The control valve according to claim 3, characterized in that The valve body further includes a guide portion extending from the top wall portion towards the valve cavity. The guide portion has a guide channel penetrating through it, and the guide channel is coaxial with and communicates with the through hole in the top wall portion. The sealing ring is located within the guide channel. The diameter of the guide channel decreases along the direction close to the top wall.

5. The control valve of claim 1, wherein The input torque of the valve spindle assembly is 3.5 Nm to 4.5 Nm. The length of the meshing portion of the teeth of the second connecting part and the teeth of the first connecting part is 10 mm to 15 mm.

6. The control valve according to any one of claims 1 to 5, characterized by The control valve further includes a drive device located on the side of the top wall opposite to the valve chamber. The drive device includes a drive component that is drively connected to the transmission connection portion.

7. The control valve of claim 1, wherein The valve body also includes a bottom cover, which is located on the side of the side wall portion away from the top wall portion. The bottom cover is fixedly disposed and sealed to the side wall portion. The bottom cover includes a bottom wall portion and a limiting portion. The limiting portion protrudes from the bottom wall portion and is located inside the valve cavity. The valve core shaft assembly also includes a support portion, which is located on the bottom plate of the valve core portion away from the top plate. The support portion is limitedly connected to the limiting portion.

8. A method of manufacturing a control valve, characterized by: include: The system provides a valve core, a valve body, a sealing ring, and a bottom cover. The valve core includes a valve core shaft assembly, which includes a first valve core shaft and a second valve core shaft. The second valve core shaft has a greater strength than the first valve core shaft. The first valve core shaft includes a first connecting portion. The second valve core shaft includes a second connecting portion, a stepped portion, and a transmission connecting portion. The transmission connecting portion and the second connecting portion are arranged along the height direction of the second valve core shaft. The stepped portion is located on the outer periphery of the second connecting portion and has a stepped surface. The valve body includes a side wall portion and a top wall portion. The top wall portion is integrally formed with the side wall portion. The control valve has a valve cavity. The top wall portion is located at one end of the side wall portion, and the other end of the side wall portion has an opening communicating with the valve cavity. The top wall portion has a through hole penetrating the top wall portion and communicating with the valve cavity. Forming a valve core assembly includes assembling a first valve core shaft, a second valve core shaft, and a sealing ring to enable a driving connection between the first connecting portion and the second connecting portion. The sealing ring is sleeved on the outer peripheral side of the second valve core shaft and located in the gap between the stepped surface of the second valve core shaft and the inner surface of the top wall portion. The sealing ring is in contact with the stepped surface or has a gap with the stepped surface. The valve core assembly is inserted into the valve cavity through the opening and at least a portion of the transmission connection is placed outside the valve body through the through hole, so that the sealing ring is coaxial with the through hole of the top wall. The bottom cover is fixedly connected to the end of the side wall portion away from the top wall portion and sealed.

9. The method of manufacturing a control valve according to claim 8, wherein The bottom cover includes a bottom wall portion and a limiting portion, the limiting portion protruding from the bottom wall portion, and the first valve spindle has a supporting portion. The method of fixing and sealing the bottom cover to the end of the side wall portion away from the top wall portion includes: The supporting part is connected to the limiting part in a limiting manner; The bottom cover and one end of the side wall are fixedly connected and sealed by welding.

10. The method of manufacturing a control valve according to claim 8, wherein The inner surface of the second connecting part has a toothed shape, and the outer surface of the first connecting part has a toothed shape. The valve core assembly includes: A second valve spindle assembly is formed, wherein the inner diameter of the sealing ring is smaller than the outer diameter of the stepped surface; The teeth of the second connecting part and the teeth of the first connecting part are engaged to make the length of the engaging part 10 mm to 15 mm.

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