Control valve and manufacturing method thereof

Abstract

A control valve and a manufacturing method thereof, the control valve includes a valve body (10) and a valve element (20). The valve element (20) includes a top plate (201), a bottom plate (202), a first stopper block (203) and a valve element shaft unit (SA). The valve element shaft unit (SA) includes a transmission connection part (222), at least a part of which is located on a side of the top plate (201) away from the bottom plate (202). The first stopper block (203) is fixedly connected to the top plate (201) to be an integral structure, and extends from the top plate (201) in a direction away from the bottom plate (202). The valve body (10) further includes a top wall part (13) and a second stopper block (15) located at one end of a height direction of a side wall part (11). The top wall part (13) and the side wall part (11) are fixed to each other. 1), the top wall portion (13) has a through hole (131), the through hole (131) is connected to the valve chamber (101), and at least a part of the transmission connection part (222) is located outside the valve body (10) through the through hole (131). The second stopper block (15) is located in the valve chamber (101) and protrudes from the top wall portion (13) and is fixedly connected to the top wall portion (13) to form an integral structure. When the valve element (20) rotates to a predetermined position, the first stopper block (203) and the second stopper block (15) abut against each other to restrict the valve element (20) from continuing to rotate toward the second stopper block (15). This makes it possible to relatively accurately position the valve element (20) and reduce the degree of deformation of the valve element (20).

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed with the China Patent Office on April 16, 2021, bearing application number 202110411384.6 and entitled "Control valve and manufacturing method thereof," the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of fluid control, and specifically to control valves and methods of manufacturing the same. [Background technology]

[0003] Generally, the valve element of a control valve is rotated by the driving member to realize fluid control for multiple flow paths of the control valve. How to accurately position the valve element and reduce deformation of the valve element is a problem to be solved. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE INVENTION An object of the present application is to provide a control valve that allows the position of the valve disc to be relatively accurate and reduces the degree of deformation of the valve disc. [Means for solving the problem]

[0005] According to one aspect, an embodiment of the present application provides a control valve, the control valve including a valve body and a valve element, the valve body including a side wall portion, the control valve having a valve chamber, the side wall portion forming at least a part of a wall portion of the valve chamber, at least a part of the valve element being located in the valve chamber and being rotatable by being driven, the valve element including a top plate, a bottom plate, a first stopper block, and a valve element shaft unit, the top plate and the bottom plate being arranged along a height direction of the valve element, the valve element shaft unit including a transmission connecting portion, at least a part of the transmission connecting portion being located on a side of the top plate away from the bottom plate, the valve element being rotatable by the transmission connecting portion, and the first stopper block being connected to the top plate, The valve body further includes a top wall and a second stopper block. The top wall is disposed close to one end of the side wall and has a through hole communicating with the valve chamber. At least a portion of the transmission connection part passes through the through hole and is located outside the valve body. The second stopper block is located in the valve chamber and protrudes from the top wall. When the valve element rotates to a predetermined position, the first stopper block and the second stopper block abut against each other to restrict the valve element from further rotating toward the second stopper block.

[0006] According to another aspect, embodiments of the present application further provide a method for manufacturing a control valve, comprising: providing a valve element, a valve body, a sealing ring, and a bottom cover, wherein the valve element comprises a valve element shaft unit, the valve element shaft unit comprising a first valve element shaft and a second valve element shaft, the first valve element shaft comprising a first connecting portion, the second valve element shaft comprising a second connecting portion, a stepped portion, and a transmission connecting portion, the transmission connecting portion and the second connecting portion being arranged along the height direction of the second valve element shaft, the stepped portion being located on the outer periphery of the second connecting portion and having a stepped surface, the valve body comprising an integrally molded side wall portion and a top wall portion, the control valve having a valve chamber, the top wall portion being located at one end of the side wall portion and the other end of the side wall portion having an opening communicating with the valve chamber, the top wall portion having a through hole penetrating the top wall portion, and the through hole communicating with the valve chamber; forming a valve body unit, in which the first valve body shaft, the second valve body shaft and a sealing ring are assembled together, so that the first connecting part and the second connecting part are connected to transmit power, and the sealing ring is fitted onto the outer periphery of the second valve body shaft and is in contact with the stepped surface or has a gap with the stepped surface; attaching the valve element unit to the valve chamber through the opening, and positioning at least a portion of the power transmission connection portion through the through-hole and outside the valve body; and positioning the bottom cover so as to be fixedly connected to and sealingly secured to one end of the side wall portion remote from the top wall portion. [Effects of the Invention]

[0007] According to the control valve and manufacturing method of the control valve provided in the embodiments of the present application, a first stopper block is disposed on the valve disc and a second stopper block is disposed on the valve body. When the valve disc rotates to a predetermined position, the first stopper block and the second stopper block come into contact with each other, restricting the valve disc from continuing to move toward the second stopper block. In this way, a positional reference is formed between the valve disc and the valve body, making the rotation position of the valve disc more accurate and improving the control accuracy of the control valve. The valve disc includes a transmission connection part that is connected to a driving device for transmission to rotate the valve disc. The first stopper block is fixedly connected to a top plate adjacent to the transmission connection part, and the second stopper block is fixedly connected to a top wall adjacent to the transmission connection part. Therefore, when the first stopper block comes into contact with the second stopper block, it is close to the transmission connection part and the driving device and receives a small driving force, which reduces the torsional deformation of the valve disc and improves the operating stability of the control valve. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an exploded structural schematic diagram of a control valve provided by an embodiment of the present application; [Figure 2] 2 is a schematic cross-sectional view of the control valve of FIG. 1 at one position. FIG. [Figure 3] 1 is a schematic diagram of the local structure of a valve body provided by one embodiment of the present application; [Figure 4] 1 is a structural schematic diagram of a valve body provided by one embodiment of the present application; [Figure 5] FIG. 5 is a schematic diagram of a local structure of the valve body of FIG. 4. [Figure 6] FIG. 4 is a schematic diagram of a local cross-sectional structure of the valve body of FIG. 3. [Figure 7] FIG. 7 is an enlarged structural schematic diagram of a portion Q1 of the valve body in FIG. 6. [Figure 8] FIG. 2 is a front structural schematic diagram of a local structure of the control valve of FIG. 1. [Figure 9] 9 is a cross-sectional view taken along the direction AA of the control valve in FIG. 8. [Figure 10] FIG. 10 is a structural schematic diagram of the control valve at a position Q2 in FIG. 9. [Figure 11] FIG. 5 is a front view of the valve body shown in FIG. 4. [Figure 12] 12 is a cross-sectional view of the valve body of FIG. 11 taken along the direction BB. [Figure 13] 13 is an enlarged schematic structural view of a portion Q3 of the valve body of FIG. 12. FIG. [Figure 14] FIG. 2 is a structural schematic diagram of a second valve body shaft provided by an embodiment of the present application. [Figure 15] FIG. 15 is a schematic cross-sectional view of the second valve body shaft of FIG. [Figure 16] 1 is a flow diagram of a method for manufacturing a control valve provided by one embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0009] The features and exemplary embodiments of each aspect of the present application will be described in detail below, and in order to make the objectives, technical solutions and advantages of the present application more comprehensible, the present application will be described in more detail below in combination with drawings and specific examples. In this specification, relative terms such as "first" and "second" do not require or imply that there is any actual relationship or order between these elements, but are used merely to distinguish between two elements having the same name.

[0010] As shown in FIGS. 1 to 3, an embodiment of the present application provides a control valve 1, which includes a valve body 10, a valve element 20, and a first sealing member 41. The valve body 10 includes a side wall 11. The control valve 1 has a valve chamber 101. The side wall 11 forms the peripheral wall of the valve chamber 101, or is at least a part of the peripheral wall. The first sealing member 41 is located between the valve element 20 and the side wall 11 along the radial direction of the valve element 20. The valve element 20 can be rotated by driving. The control valve 1 further includes a driving device 50 and a sealing ring 43. The driving device 50 includes a driving member, which can be a motor or a combination of a motor and a reduction gear set. The valve element 20 can be rotated by driving the driving member in the driving device 50. In FIG. 1, the valve body 10 includes a bottom cover 12 and a top wall 13. The valve body 10 further includes a bottom cover 12 and a valve chamber 101 located between the top wall 13 and the side wall 11, the top wall 13 and the side wall 11 being integrally molded, a sealing ring 43 located between the top wall 13 and the valve element 20, at least a portion of the side wall 11 being located between the bottom cover 12 and the top wall 13, the bottom cover 12 being fixedly connected to the side wall 11 by a welding process and arranged in a sealed manner to prevent fluid leakage, and at least a portion of the valve element 20 being located outside the valve body 10 through the top wall 13 and connected to the driving device 50 for transmission, in which the sealing ring 43 is located between the top wall 13 and the valve element 20 to prevent fluid leakage from the top wall 13 and improve the sealing performance of the control valve 1. The control valve 1 includes at least five passages 30, one end of each passage 30 penetrating the side wall portion 11 and communicating with the valve chamber 101, and the other end forming a valve port 102 of the control valve 1, through which fluid can enter and exit the control valve 1.

[0011] In order to facilitate the assembly of the control valve 1 with other components in the fluid control system and improve the degree of integration between the control valve 1 and other components, in some embodiments, as shown in FIGS. 1 to 3 , the valve body 10 further includes a mounting portion 14, which is fixedly connected to the side wall portion 11 and is located on the side of the side wall portion 11 away from the valve chamber 101. For example, the mounting portion 14 is integrally molded with the side wall portion 11 and has a mounting surface 141. The valve ports 102 of the control valve 1 pass through the mounting surface 141, so that the valve ports 102 of the control valve 1 are all positioned on the mounting surface 141 and are oriented in the same direction. This simplifies the assembly steps between the control valve 1 and other components, reduces leak points at the connections, and improves sealing reliability. In some embodiments, the first sealing member 41 includes a through-hole 411 penetrating therethrough, which corresponds to and communicates with at least a portion of the passage 30 of the control valve 1, and the first sealing member 41 is deformed by the pressing action of the valve body 20 and the side wall 11 to achieve sealing of the first sealing member 41 against the control valve 1. Here, the passages of the control valve 1 may be arranged along the circumferential direction of the side wall 11, and the valve ports 102 may be arranged along the circumferential direction of the side wall 11, which is not limited to this embodiment.

[0012] 1 and 2, the cross section of the first sealing member 41 has an arc-shaped structure. When the valve body 20 presses the first sealing member 41, the valve body 20 may become eccentric, which may affect the rotation of the valve body 20. Therefore, in some embodiments, the control valve 1 further includes a second sealing member 42, and the second sealing member 42 and the first sealing member 41 are respectively disposed on both radial sides of the valve body 20. The second sealing member 42 and the first sealing member 41 both exert force on the valve body 20, keeping the valve body 20 and the side wall portion 11 coaxially, and improving the stability of the rotation of the valve body 20.

[0013] As shown in Figures 1, 4 and 5, the valve element 20 has a plurality of external connecting chambers 25, which have a groove structure formed by recessing from the side surface of the valve element 20 into the valve element 20. During the rotation of the valve element 20, at least some of the external connecting chambers 25 connect and / or block the two corresponding valve ports 102. The valve element 20 further includes an internal connecting chamber 26, which has a plurality of external connecting chambers 25 distributed around the periphery of the internal connecting chamber 26 and communicates with some of the external connecting chambers 25. During the rotation of the valve element 20, the external connecting chambers 25 and the internal connecting chamber 26 connect and / or block the two corresponding valve ports 102, thereby realizing the fluid control function of the control valve 1.

[0014] Furthermore, the valve body 20 includes a top plate 201, a bottom plate 202, a first partition plate 23, a second partition plate 24, a first stopper block 203, and a valve body shaft unit SA. The first partition plate 23 has a communication hole, and the internal connecting chamber 26 communicates with some of the external connecting chambers 25 through the communication hole. Each external connecting chamber 25 is separated as an independent space by the second partition plate 24, and the cross-sectional areas of the chamber openings of the external connecting chambers 25 may be different. For example, the external connecting chamber 25 may be divided into a first chamber 251 and a second chamber 252. The first chamber 251 includes a second chamber 252, and the cross-sectional area of ​​the chamber opening of the first chamber 251 is at least twice the cross-sectional area of ​​the chamber opening of the second chamber 252. In this case, the first chamber 251 can connect and / or block two valve ports 102 corresponding to the first chamber 251, and the internal connecting chamber 26 is connected to a part of the second chamber 252 via a connecting hole, so that the internal connecting chamber 26 and the second chamber 252 can connect and / or block two valve ports 102 corresponding to the two chambers.

[0015] The top plate 201 and the bottom plate 202 of the valve body 20 are arranged along the height direction of the valve body 20, the external conducting chamber 25 is located between the top plate 201 and the bottom plate 202, the top plate 201 and the bottom plate 202 are both fitted on the outer periphery of the valve body stem unit SA, the valve body stem unit SA includes a power transmission connection part 222, at least a part of which protrudes from the top plate 201 and is located on the side of the top plate 201 away from the bottom plate 202, and by combining FIG. 1, the valve body 20 is connected to the drive unit 50 by the power transmission connection part 222 so as to transmit power. Thus, the actuator 50 can rotate the valve disc 20 via the transmission connection 222, and the first stopper block 203 protrudes from the top plate 201 and can be fixedly connected to the top plate 201 to form an integrated structure, or can be separately arranged and fixedly connected. In this case, the actuator 50 is arranged close to the top plate 201, and the first stopper block 203 extends from the top plate 201 in a direction away from the bottom plate 202, and the first stopper block 203 can limit the rotation position of the valve disc 20. In the embodiment of the present application, the first stopper block 203 is fixedly connected to the top plate 201 close to the transmission connection 222. Therefore, when limiting the rotation position of the valve disc 20, the first stopper block 203 is close to the transmission connection 222 and the actuator 50, and therefore receives a small driving force, which reduces the degree of torsional deformation of the valve disc 20 and improves the operating stability of the control valve 1. Preferably, the valve body 20 further includes a reinforcing rib 27, and the valve body shaft unit SA includes a first valve body shaft 21 and a second valve body shaft 22 that are connected to each other for transmission, the first valve body shaft 21 is connected to the drive device 50 by the second valve body shaft 22 for transmission, and the reinforcing rib 27 is connected between the first partition plate 23 and the first valve body shaft 21. In this specification, the transmission connection of two members means that transmission force can be transmitted between the two members, and the two members may be directly connected or may be connected to each other for transmission by a transmission mechanism such as gears.

[0016] As shown in FIGS. 6 to 10, the valve body 10 further includes a top wall 13 and a second stopper block 15 located at one end of the side wall 11 in the height direction. The top wall 13 and the side wall 11 are integrally molded and form part of the wall of the valve chamber 101. The top wall 13 has a through hole 131 that communicates with the valve chamber 101. The second stopper block 15 is located in the valve chamber 101 and protrudes from the top wall 13. At least a part of the power transmission connection 222 of the valve element shaft unit SA passes through the through hole 131 and is located outside the valve body 10. As shown in FIG. 9, the entire power transmission connection 222 is located outside the valve body 10. The second stopper block 15 is fixed and connected to the top wall 13 to form an integral structure. 2, when the valve element 20 rotates to a predetermined position, the first stopper block 203 and the second stopper block 15 come into contact, restricting the valve element 20 from continuing to rotate toward the second stopper block 15. This allows the first stopper block 203 and the second stopper block 15 to form a positional reference between the valve element 20 and the valve body 10, making the rotation position of the valve element 20 more accurate and improving the control accuracy of the control valve 1. The side wall 11, the top wall 13, and the second stopper block 15 can be integrally formed, and when the first stopper block 203 comes into contact with the second stopper block 15, the structural strength of the valve body 10 is improved. Compared to when the side wall 11 and the top wall 13 are separately disposed and then welded together, the structure of the embodiment of the present application can improve the problem of cracks at the weld seam between the side wall 11 and the top wall 13.

[0017] As shown in FIGS. 10 to 15, in some embodiments, in order to improve the structural strength of the valve disc 20, the valve disc shaft unit SA includes a first valve disc shaft 21 and a second valve disc shaft 22, and the strength of the second valve disc shaft 22 is greater than that of the first valve disc shaft 21. The first valve disc shaft 21 includes a first connecting part 211, which is located at one end of the first valve disc shaft 21 and is at least partially located in the valve chamber 101. The second valve disc shaft 22 includes a transmission connecting part 222 and a second connecting part 221. The transmission connecting part 222 of the valve disc shaft unit SA is provided on the second valve disc shaft 22, and the transmission The connecting portion 222 is located at one end of the second valve disc shaft 22, and the second valve disc shaft 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 disc shaft 22, at least a portion of the second connecting portion 221 is located in the valve chamber 101, and at least a portion of the transmission connecting portion 222 is located outside the valve chamber 101 and protrudes from the top wall 13, the inner surface of one of the second connecting portion 221 and the first connecting portion 211 has a toothed profile, and the outer surface of the other has a toothed profile, and the toothed profile of the second connecting portion 221 meshes with the toothed profile of the first connecting portion 211. This arrangement improves the structural strength of the valve disc 20 and allows the first valve disc shaft 21 and the second valve disc shaft 22 to rotate synchronously.

[0018] Preferably, as shown in Figures 12 to 15, in order to improve the torsional resistance strength of the valve body 20 during the rotation process, the valve body 20 includes a first spiral reinforcing rib 213, a second spiral reinforcing rib 214 and a third spiral reinforcing rib 224, wherein the first spiral reinforcing rib 213 is located between the outer surface of the first valve body shaft 21 and the inner surface of the first partition plate 23, the second spiral reinforcing rib 214 is located in a cavity surrounded by the inner surface of the first valve body shaft 21, and the third spiral reinforcing rib 224 is located in a cavity surrounded by the inner surface of the second valve body shaft 22. In specific implementation, the first spiral reinforcing rib 213, the second spiral reinforcing rib 214, and the third spiral reinforcing rib 224 have a spiral extension structure, the first spiral reinforcing rib 213, the second spiral reinforcing rib 214, the first valve body shaft 21, the first partition plate 23, and the second partition plate 24 are injection molded as a single unit, and the third spiral reinforcing rib 224 is molded integrally with the second valve body shaft 22.

[0019] In specific implementation, the inner surface of the second connecting portion 221 of the second valve disc shaft 22 has a toothed structure, and the outer surface of the first connecting portion 211 of the first valve disc shaft 21 has a toothed structure, and the engagement of the toothed structures realizes the transmission connection between the first valve disc shaft 251 and the second valve disc shaft 22, so that the first valve disc shaft 251 and the second valve disc shaft 252 rotate synchronously. Preferably, the material of the first valve disc shaft 21 may be a combination of Polyamide-66 (PA66) and glass fiber (GF), or a combination of Polyphthalamide (PPA) and glass fiber (GF), or polyphenylene sulfide (PPS), and the material of the second valve disc shaft 22 may be one or a combination of metal and polyphenylene sulfide (PPS). In some other embodiments, the control valve 1 may not be provided with the second valve body shaft 22, but may be connected to the drive device by the first valve body shaft 21 so as to rotate the valve body.

[0020] In order to improve the stability of the transmission connection between the first valve body shaft 21 and the second valve body shaft 22, in some embodiments, the output torque of the control valve 1 is 3.5 Nm to 4.5 Nm, in which case the input torque of the valve body shaft unit SA is 3.5 Nm to 4.5 Nm, and the length of the meshing portion between the tooth profile of the second connecting portion 221 and the tooth profile of the first connecting portion 211 is 10 mm to 15 mm.

[0021] In some embodiments, the linear expansion coefficient of the second valve body shaft 22 is equal to or less than the linear expansion coefficient of the first valve body shaft 21, so that the size change of the second valve body shaft 22 is small when the ambient temperature in which the second valve body shaft 22 is located is high, and the control valve 1 can be applied to various temperature environments, thereby improving the applicability of the control valve 1. 10 to 15, the second valve body shaft 22 includes a stepped portion 223, and the stepped portion 223 and the second connecting portion 221 are fixedly connected to form an integral structure. Alternatively, as shown in FIG. 10, they may be arranged separately and fixedly connected. Along the height direction of the second valve body shaft 22, the orthogonal projection of the second connecting portion 221 is located within the orthogonal projection of the annular stepped portion 223. The stepped portion 223 has a stepped surface 2231. The stepped surface 2231 is arranged opposite to the top wall portion 13 and has a gap. The stepped surface 2231 is located in the valve chamber 101. If the control valve 1 further includes a sealing ring 43, the sealing ring 43 is arranged coaxially with the wall portion of the through hole 131 in the top wall portion 13. The sealing ring 43 is fitted on the outer periphery of the second valve body shaft 22 and is located in the gap between the stepped surface 2231 of the second valve body shaft 22 and the inner surface of the top wall portion 13. By setting the linear expansion coefficient of the second valve body shaft 22 to be equal to or less than the linear expansion coefficient of the first valve body shaft 21, the size change of the second valve body shaft 22 is small at the ambient temperature where the second valve body shaft 22 is located, which reduces the deformation of the sealing ring 43 and improves the sealing performance of the control valve 1.

[0022] 7 and 10 , in some embodiments, the valve body 10 further includes a guide portion 16 extending from the top wall portion 13 to the valve chamber 101. The guide portion 16 has a guide passage 161 penetrating therethrough. The guide passage 161 is coaxial with and communicates with the wall of the through-hole 131 in the top wall portion 13. The diameter of the inner wall surface of the guide passage 161 gradually decreases as it approaches the top wall portion 13. The sealing ring 43 is located within the guide passage 161. Since the diameter of the inner wall surface of the guide passage 161 gradually decreases, when the sealing ring 43 is assembled into the valve body 10, the inner wall surface of the guide passage 161 acts as a guide for the assembly of the sealing ring 43, facilitating installation of the sealing ring 43 and improving the accuracy of the installation position of the sealing ring 43.

[0023] As shown in Figures 1, 2, 4, 8 and 9, in some embodiments, when the control valve 1 further includes a driving device 50, the driving device 50 is located on the side of the top wall portion 13 away from the valve chamber 101 and includes a driving member, which is connected to the transmission connection portion 222 for power transmission. In this case, when the first stopper block 203 and the second stopper block 15 are both close to the driving device 50 and the valve element 20 rotates until the first stopper block 203 and the second stopper block 15 abut against each other, the driving force received by the valve element 50 is small, thereby reducing torsional deformation of the valve element 20. The valve body 10 further includes a bottom cover 12, which is located on the side of the side wall 11 away from the top wall 13. The bottom cover 12 is fixedly disposed on the side wall 11 and connected to the side wall 11 in a sealing manner. The bottom cover 12 includes a bottom wall 121 and a position limiting portion 122. The position limiting portion 122 protrudes from the bottom wall 121 and is located in the valve chamber 101. The valve element shaft unit SA further includes a support portion 212, which is located at one end of the first valve element shaft 21 and on the side of the bottom plate 202 of the valve element 20 away from the top plate 201. The support portion 212 is connected to the position limiting portion 122 in a position limiting manner. Specifically, the position limiting portion 122 in FIG. 9 has a groove structure, and the support portion 212 is inserted into the groove structure. This arrangement ensures accurate installation of the valve element 20 and improves the stability of the valve element 20's rotation.

[0024] As described above, the control valve 1 provided in the embodiment of the present application has a first stopper block 203 disposed on the valve element 20 and a second stopper block 15 disposed on the valve body 10. When the valve element 20 rotates to a predetermined position, the first stopper block 203 and the second stopper block 15 come into contact with each other, restricting the valve element 20 from continuing to move toward the second stopper block 15. This forms a position reference between the valve element 20 and the valve body 10, making the rotation position of the valve element 20 more accurate and improving the control accuracy of the control valve 1. The valve element 20 includes a transmission connection part 222. The portion 222 is connected to the drive unit 50 to transmit power and rotate the valve body 20, the first stopper block 203 is fixedly connected to the top plate 201 close to the transmission connection portion 222, and the second stopper block 15 is fixedly connected to the top wall portion 13 close to the transmission connection portion 222. When the first stopper block 203 and the second stopper block 15 abut against each other, the first stopper block 203 is close to the transmission connection portion 222 and the drive unit 50, and the driving force it receives is small, which reduces the degree of torsional deformation of the valve body 20 and improves the operating stability of the control valve 1.

[0025] As shown in FIG. 16, an embodiment of the present application further provides a method for manufacturing a control valve, which combines FIGS. 1 to 15 and includes the following steps: S110: Provide the valve element 20, the valve body 10, the sealing ring 43 and the bottom cover 12.

[0026] The valve body 20 includes a valve body shaft unit SA, which includes a first valve body shaft 21 and a second valve body shaft 22. The first valve body shaft 21 includes a first connecting portion 211. The second valve body shaft 22 includes a second connecting portion 221, a stepped 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 body shaft 22. The stepped portion 223 is located on the outer periphery of the second connecting portion 221. The two are fixed and connected to form an integrated structure. As shown in FIG. 10, they may be arranged separately and fixed and connected. The stepped portion 223 has a stepped surface 2231 that is perpendicular to the height direction of the second valve body 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 chamber 101. The top wall portion 13 is integrally molded with the side wall portion 11 to define the valve chamber 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 chamber 101. The top wall portion 13 has a through hole 131 penetrating the top wall portion 13, and the through hole 131 communicates with the valve chamber 101. The valve element 20 includes a top plate 201, a bottom plate 202, a first stopper block 203, and a valve element shaft unit SA, the top plate 201 and the bottom plate 202 are arranged along the height direction of the valve element 20, the valve element shaft unit SA includes a transmission connection part 222, at least a part of which is located on the side of the top plate 201 away from the bottom plate 202, the valve body 10 further includes a top wall part 13 and a second stopper block 15, the top wall part 13 is located close to one end of the side wall part 11. The structures of the valve body 10 and the valve element 20 in the examples of the present application are similar to those of the valve body 10 and the valve element 20 provided in any one of the above embodiments, and will not be described in detail.

[0027] S120: Form a valve body unit structure. In this embodiment, in step S120, the first valve body shaft 21, the second valve body shaft 22 and the sealing ring 43 are assembled, so that the first connecting part 211 is connected to the second connecting part 221 in a transmission manner, and the sealing ring 43 is fitted onto the outer periphery of the second valve body shaft 22 and is in contact with the stepped surface 2231 or has a gap with the stepped surface 2231. Preferably, the inner diameter of the sealing ring 43 is smaller than the outer diameter of the second valve body shaft 22, so that the sealing ring 43 is stably restricted in position on the second valve body shaft 22.

[0028] S130: The valve element unit structure is attached to the valve chamber 101 through the opening 111, and at least a part of the transmission connection part 222 is passed through the through-hole 131 and positioned outside the valve body 10.

[0029] Specifically, the valve element 20 is attached to the valve chamber 101 through the opening 111, and at least a portion of the transmission connection part 222 is passed through the through hole 131 and positioned outside the valve body 10. When the valve element 20 rotates to a predetermined position, the first stopper block 203 and the second stopper block 15 abut against each other, restricting the valve element 20 from continuing to rotate toward the second stopper block 15.

[0030] S140: The bottom cover 12 is fixedly connected to the end of the side wall 11 remote from the top wall 13 and arranged to seal.

[0031] When the control valve 1 includes the first sealing member 41 and the second sealing member 42, before step S130 of attaching the valve body unit to the valve chamber 101 through the opening 111 and positioning at least a portion of the transmission connection part 222 through the through-hole 131 and outside the valve body 10, the first sealing member 41 and the second sealing member 42 are attached to the valve chamber 101, thereby providing good sealing performance for the control valve 1. The control valve manufactured by the above-described method for manufacturing a control valve has the same beneficial effects as the control valve provided in any one of the above-described embodiments, and deformation of the sealing ring 43 can be reduced, so no further explanation is required.

[0032] In some embodiments, the bottom cover 12 includes a bottom wall 121 and a limiting portion 122, the limiting portion 122 protruding from the bottom wall 121, the first valve body shaft 21 including a support portion 212 located at one end of the first valve body shaft 21, and the first connecting portion 211 located at the other end of the first valve body shaft 21. In this case, step S140 of fixingly connecting and sealingly disposing the bottom cover 12 to an end of the side wall 11 remote from the top wall 13 includes connecting the support portion 212 to the limiting portion 122 in a limiting manner, and welding the bottom cover 12 and the side wall 11 together. Specifically, laser welding is performed to weld the bottom cover 12 and the side wall 11 together once around the bottom cover 12 and the side wall 11, thereby fixingly connecting and sealingly disposing the two together.

[0033] In order to ensure a stable connection between the first valve body shaft 21 and the second valve body shaft 22, effectively transmit the driving torque, and prevent the first valve body shaft 21 and / or the second valve body shaft 22 from breaking, in some embodiments, the inner surface of one of the second connecting part 221 and the first connecting part 211 has a toothed profile, and the outer surface of the other has a toothed profile. In this case, in step S120 of forming the valve body unit structure, a second valve body shaft unit is formed, and a sealing ring 43 is fitted onto the outer periphery of the second valve body shaft 22, so that the sealing ring 43 and the stepped surface 2231 are in contact with each other or spaced apart. In this case, the inner diameter of the sealing ring 43 is smaller than the outer diameter of the stepped surface 2231, and the toothed profile of the second connecting part 221 and the toothed profile of the first connecting part 211 are meshed with each other, and the length of the meshed part is set to 10 mm to 15 mm.

[0034] Here, the above embodiments do not limit the technical solutions described in the present application, but are merely for the purpose of explaining the present application. For example, the definitions of directions such as "front", "back", "left", "right", "up", and "down" have been described in detail in the present specification with reference to the above embodiments. However, as can be understood by those skilled in the art, amendments, combinations, or equivalent substitutions may still be made to the present application, and all technical solutions and improvements thereon that do not deviate from the spirit and scope of the present application should fall within the scope of the claims of the present application.

Claims

1. a valve body and a valve element, the valve body including a side wall portion, the control valve having a valve chamber, the side wall portion forming at least a part of a wall portion of the valve chamber, at least a part of the valve element being located in the valve chamber and being rotatable by being driven; the valve element including a top plate, a bottom plate, a first stopper block, and a valve element shaft unit, the top plate and the bottom plate being arranged along a height direction of the valve element, the valve element shaft unit including a transmission connecting portion, at least a part of the transmission connecting portion being located on a side of the top plate away from the bottom plate, the valve element being rotatable by the transmission connecting portion, and the first stopper block being connected to the top plate; the valve body further includes a top wall portion and a second stopper block, the top wall portion being disposed close to one end of the side wall portion and having a through hole communicating with the valve chamber, at least a portion of the transmission connection portion passing through the through hole and positioned outside the valve body, the second stopper block being positioned in the valve chamber and protruding from the top wall portion, and when the valve element rotates to a predetermined position, the first stopper block and the second stopper block come into contact with each other to restrict the valve element from further rotating toward the second stopper block; the control valve further includes a drive device, the drive device being located on a side of the top wall portion away from the valve chamber, the drive device including a drive member, the drive member being connected to the transmission connection portion for transmission; the first stopper block extends from the top plate in a direction away from the bottom plate, the top wall portion and the side wall portion are integrally formed, the second stopper block and the top wall portion are fixedly connected to form an integral structure, and the first stopper block and the top plate are fixedly connected to form an integral structure, the valve disc shaft unit includes a first valve disc shaft and a second valve disc shaft, the second valve disc shaft having a strength greater than that of the first valve disc shaft, the first valve disc shaft including a first connecting part, the first connecting part being located at one end of the first valve disc shaft and at least partially located in the valve chamber, the second valve disc shaft including the transmission connecting part and a second connecting part, the second connecting part and the transmission connecting part being arranged along the height direction of the second valve disc shaft, at least a part of the second connecting part being located in the valve chamber, and at least a part of the transmission connecting part being located outside the valve chamber and protruding from the top wall part.

2. A control valve as described in claim 1, characterized in that the first connection portion and the second connection portion are connected in a transmission manner so that the first valve body shaft and the second valve body shaft rotate synchronously.

3. 3. The control valve according to claim 2, wherein an inner surface of one of the second connecting portion and the first connecting portion has a toothed profile, and an outer surface of the other has a toothed profile, and the toothed profile of the second connecting portion and the toothed profile of the first connecting portion mesh with each other.

4. The input torque of the valve body shaft unit is 3.5 N.m to 4.5 N.m, 4. The control valve according to claim 3, wherein the length of the meshing portion between the teeth of the second connecting portion and the teeth of the first connecting portion is 10 mm to 15 mm.

5. the first valve body shaft is made of a material selected from the group consisting of polyamide 66 and glass fiber, polyphthalamide and glass fiber, and polyphenylene sulfide; 3. The control valve according to claim 2, wherein the second valve body shaft is made of a material selected from the group consisting of metal and polyphenylene sulfide, or a combination thereof.

6. a linear expansion coefficient of the second valve element shaft is equal to or less than a linear expansion coefficient of the first valve element shaft, the second valve element shaft includes a stepped portion, the stepped portion has a stepped surface, the stepped surface is located in the valve chamber and is arranged to face the top wall portion, 3. The control valve according to claim 2, further comprising a sealing ring, the sealing ring being coaxially disposed on the wall of the through hole in the top wall portion, the sealing ring being fitted onto the outer periphery of the second valve body shaft, and being located between the stepped surface of the second valve body shaft and the top wall portion.

7. the valve body further includes a guide portion extending from the top wall portion to the valve chamber, the guide portion having a guide passage penetrating the guide portion, the guide passage being coaxial with and communicating with the through hole of the top wall portion, and the sealing ring being located within the guide passage; 7. The control valve according to claim 6, wherein the diameter of the guide passage gradually decreases in a direction approaching the top wall portion.

8. 8. The control valve according to claim 1, wherein the valve body further includes a bottom cover, the bottom cover being located on a side of the side wall portion away from the top wall portion, fixedly disposed on the side wall portion, and connected to be sealed; the bottom cover including a bottom wall portion and a position limiting portion, the position limiting portion protruding from the bottom wall portion and located within the valve chamber; and the valve element shaft unit further including a support portion, the support portion being located on a side of the bottom plate of the valve element away from the top plate, and connected to be positionally limited by the position limiting portion.

9. A method for manufacturing a control valve, comprising: providing a valve element, a valve body, and a bottom cover, wherein the valve body includes a side wall portion, the control valve has a valve chamber, the side wall portion forms at least a part of a wall portion of the valve chamber, the valve element includes a top plate, a bottom plate, a first stopper block, and a valve element shaft unit, the top plate and the bottom plate are arranged along the height direction of the valve element, the valve element shaft unit includes a transmission connecting portion, at least a part of the transmission connecting portion is located on a side of the top plate away from the bottom plate, the valve body further includes a top wall portion and a second stopper block, the top wall portion is arranged close to one end of the side wall portion and has a through hole, the through hole communicates with the valve chamber, the other end of the side wall portion has an opening communicates with the valve chamber, and the second stopper block is located in the valve chamber and protrudes from the top wall portion; attaching the valve element to the valve chamber through the opening, and positioning at least a portion of the power transmission connection portion through the through hole and outside the valve body, so that when the valve element rotates to a predetermined position, the first stopper block and the second stopper block come into contact with each other, restricting the valve element from continuing to rotate toward the second stopper block; and positioning the bottom cover so as to be fixedly connected to and sealingly secured to an end of the side wall portion remote from the top wall portion; the control valve further includes a drive device, the drive device being located on a side of the top wall portion away from the valve chamber, the drive device including a drive member, the drive member being connected to the transmission connection portion for transmission; the first stopper block extends from the top plate in a direction away from the bottom plate, the top wall portion and the side wall portion are integrally formed, the second stopper block and the top wall portion are fixedly connected to form an integral structure, and the first stopper block and the top plate are fixedly connected to form an integral structure, The valve disc shaft unit includes a first valve disc shaft and a second valve disc shaft, the first valve disc shaft includes a first connecting portion, and the second valve disc 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 disc shaft, and the stepped portion is located on the outer circumferential side of the second connecting portion and has a stepped surface; After the step of providing the valve element, the valve body, and the bottom cover, the method further comprises: a step of assembling the first valve body shaft, the second valve body shaft, and a sealing ring to connect the first connecting part and the second connecting part for power transmission, wherein the sealing ring is fitted onto the outer periphery of the second valve body shaft and is in contact with the stepped surface or has a gap with the stepped surface.

10. A method for manufacturing a control valve as described in Claim 9, characterized in that the first connection portion and the second connection portion are connected in a transmission manner so that the first valve body shaft and the second valve body shaft rotate synchronously.

11. the bottom cover includes a bottom wall portion and a position limiting portion, the position limiting portion protruding from the bottom wall portion, and the first valve body shaft has a support portion, The step of fixedly connecting and sealingly disposing the bottom cover to one end of the side wall portion remote from the top wall portion includes: connecting the support portion to the position limiting portion so as to limit its position; and fixing and sealingly disposing the bottom cover to one end of the side wall portion by a welding process.

12. an inner surface of one of the second connection portion and the first connection portion has a toothed shape, and an outer surface of the other of the second connection portion and the first connection portion has a toothed shape; The step of assembling the first valve body shaft, the second valve body shaft, and the sealing ring includes: a step of forming a second valve body shaft unit, in which the sealing ring is fitted onto the outer periphery of the second valve body shaft, the sealing ring and the stepped surface are in contact with each other or spaced apart, and the inner diameter of the sealing ring is smaller than the outer diameter of the stepped surface; and meshing the teeth of the second connecting portion with the teeth of the first connecting portion, and setting the length of the meshing portion to 10 mm to 15 mm.

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