Valve device

Abstract

A valve device (100) is provided, in which, when the valve body unit (20) is in a first working position, the seal portion (21) of the valve body unit (20) is in contact with the valve port (40), and the collision between the valve body unit (20) and the valve port (40) is limited by the arrangement such that the first contact portion (12) of the screw rod unit (10) and the second contact portion (22) of the valve body unit (20) are in contact along the axial or circumferential direction.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the China National Patent Office on May 24, 2023, with the application number 202310598006.2 and the invention title "Valve Device", and all its contents are incorporated herein by reference.

[0002] This application relates to the technical field of fluid control, specifically to valve devices.

Background Art

[0003] The valve device includes a valve body and a valve port part. The valve port part has a valve port. The valve body can adjust the opening degree of the valve port. When the valve body closes the valve port, the sealing part of the valve body collides with the valve port part to stop the movement of the valve body. If this continues for a long time, the sealing part of the valve body is prone to wear, affecting the sealing effect.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of this application is to provide a valve device that improves the sealing effect.

Means for Solving the Problems

[0005] To achieve the above object, one embodiment of this application adopts the following technical solution: A valve device comprising a screw rod unit, a valve body unit, and a valve seat unit, wherein the screw rod unit and the valve body unit are screwed together, the valve seat unit includes a valve port, the valve body unit can adjust the opening of the valve port, the screw rod unit includes a rod body and a first contact portion, the rod body and the first contact portion are fixedly connected, or connected in a position-restricted manner, or are integrally structured, the first contact portion is positioned to protrude from the rod body along the radial direction of the valve device, the valve body unit includes a seal portion and a second contact portion, the valve device includes a first working position, when the valve device is in the first working position the seal portion abuts against the valve port, and the first contact portion and the second contact portion abut along the axial or circumferential direction of the valve device. [Effects of the Invention]

[0006] In contrast to simply preventing the operation of the valve body by collision between the valve body and the valve opening, one embodiment of the present application provides a valve device in which, when the valve body unit is in a first working position, the sealing portion of the valve body unit abuts against the valve opening, and the first contact portion of the screw rod unit and the second contact portion of the valve body unit are arranged to abut along the axial or circumferential direction, thereby limiting the lowest end position of the valve body unit relative to the first contact portion, further limiting collision between the valve body unit and the valve opening, reducing wear of the sealing portion, and improving the sealing effect. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of the three-dimensional structure of one embodiment of the valve device of this application. [Figure 2] This is a schematic diagram of the cross-sectional structure at location AA in Figure 1. [Figure 3] Figure 1 is a schematic diagram of the cross-sectional structure of the BB area. [Figure 4] Figure 1 is a schematic cross-sectional view of the valve device in the open position. [Figure 5] Figure 1 is a schematic diagram of the three-dimensional structure of the screw rod unit of the valve device. [Figure 6]This is a schematic diagram of the localized enlarged structure at location C in Figure 2. [Figure 7] Figure 1 is a schematic diagram of the three-dimensional structure of the valve seat unit of the valve device. [Figure 8] This is a schematic diagram of a localized, enlarged cross-sectional structure of a second embodiment of the valve device of this application, in the closed valve state. [Figure 9] This is a schematic diagram of a localized, enlarged cross-sectional structure of a third embodiment of the valve device of this application, in the closed valve state. [Figure 10] This is a schematic diagram of a localized, enlarged cross-sectional structure of the fourth embodiment of the valve device of this application, in the closed valve state. [Figure 11] This is a schematic diagram of a localized, enlarged cross-sectional structure of the fifth embodiment of the valve device of this application, in the closed valve state. [Figure 12] Figure 11 is a schematic diagram of the three-dimensional structure of the screw rod unit of the valve device. [Modes for carrying out the invention]

[0008] The present invention will be further described below in conjunction with Figures 1 to 12 and specific embodiments, and many specific details will be mentioned in the following detailed description in order to fully understand the present invention. However, as will be understood by those skilled in the art, the specific units, equipment and features shown and described herein are illustrative and not limiting.

[0009] The valve device 100 is applicable to vehicle thermal management systems or air conditioning systems, particularly circulating systems using CO2 as a refrigerant. The vehicle thermal management system includes new energy vehicle thermal management systems, and in the vehicle thermal management system, the valve device 100 is generally used as a throttling element or a switching element. The valve device 100 includes a drive member and a valve member 3, the drive member being located on a portion of the outer circumference of the valve member 3 and fixedly connected to the valve member 3, or connected in a position-restricted manner, and the space between the drive member and the valve member 3 may be sealed to prevent water vapor or other impurities from the external environment from entering through the assembly gap between the drive member and the valve member 3 and causing corrosion or malfunction inside the drive member. The drive member includes a housing and a stator unit, the stator unit being located on a portion of the outer circumference of the valve member 3, and at least a portion of the stator unit being located on the outer circumference of the rotor unit 60 of the valve member 3. The valve device 100 is electrically and / or signal-connected to the outside by the drive member.

[0010] Referring to Figures 1 and 2, the valve member 3 includes a rotor unit 60, a screw rod unit 10, a valve body unit 20, a valve seat unit 30, and a sleeve 70, the valve seat unit 30 is located on a portion of the outer circumference of the screw rod unit 10 and on at least a portion of the outer circumference of the valve body unit 20, the sleeve 70 is fitted onto the outer circumference of the rotor unit 60 and fixedly connected to the valve seat unit 30, the rotor unit 60 is fixedly connected to the screw rod unit 10 or connected so as to be circumferentially limited in position, the screw rod unit 10 is connected to the valve body unit 20 to transmit, specifically referring to Figures 2 and 7, the screw rod unit The screw rod unit 10 is screwed with the valve body unit 20, the valve seat unit 30 includes a position limiting groove 61, and the valve body unit 20 includes a position limiting portion 62. The position limiting groove 61 is provided to extend along the axial direction of the valve device 100, and at least a portion of the position limiting portion 62 is located in the position limiting groove 61. Along the circumferential direction of the valve device 100, the walls of the position limiting groove 61 are provided to be in contact with or have a gap with the position limiting portion 62. The walls of the position limiting groove 61 can restrict the circumferential rotation of the valve body unit 20. The screw rod unit 10 and the valve body unit 20 are screwed together, so that when the screw rod unit 10 rotates, the valve body unit 20 can be moved along the axial direction of the valve device 100. Here, the circumferential direction of the valve device 100 is perpendicular to the axial direction of the valve device 100, where perpendicularity allows for an error of 10° or less. The position limiting groove 61 does not have to be located in the valve seat unit 30, and the position limiting portion 62 does not have to be located in the valve body unit 20; that is, one of the valve seat unit 30 and the valve body unit 20 includes the position limiting groove 61, and the other includes the position limiting portion 62.

[0011] Referring to Figure 2, the valve seat unit 30 includes a valve port 40, which is equipped with a valve port 41. When the rotor unit 60 rotates circumferentially due to magnetic excitation of the stator unit, it rotates the screw rod unit 10, which in turn causes the valve body unit 20 to reciprocate linearly along the axial direction of the valve device 100. In this way, the valve body unit 20 moves closer to or away from the valve port 41, thereby adjusting the opening of the valve port 41. Furthermore, the valve port 41 restricts the working medium, defining the opening of the valve port 41 as 0% to 100%. When the valve body unit 20 closes the valve port 41, referring to Figure 2, the opening of the valve port 41 is 0%, subject to the precision of the manufacturing process. Here, an opening of 0% may indicate the presence of a certain amount of leakage. When the valve body unit 20 is in the maximum open position, referring to Figure 4, the opening of the valve port 41 is 100%. The axial direction of the valve device 100 is the N direction in Figures 1-4, and the axial direction of the valve device 100 is parallel to the axial direction of the rotor unit 60. The fixed connections described in the specification include removable and non-removable connections.

[0012] Referring to Figure 2, the valve device 100 includes a screw rod unit 10, a valve body unit 20, and a valve seat unit 30, the screw rod unit 10 and the valve body unit 20 are screwed together, and along the circumferential direction of the valve device 100, the valve seat unit 30 can restrict the rotation of the valve body unit 20, the valve seat unit 30 includes a valve port 40, and the valve body unit 20 can adjust the opening degree of the valve port 41 of the valve port 40, the screw rod unit 10 includes a rod body 11 and a first contact portion 12, the rod body 11 is positioned to extend along the axial direction of the valve device 100 and is fixed and connected to the first contact portion 12, specifically the rod body 11 and the first contact portion 12 are welded together, along the radial direction of the valve device 100, the first contact The contact portion 12 is positioned to protrude radially from the rod body 11, the radial direction of the valve device 100 is perpendicular to the axial direction of the valve device 100, where the perpendicularity is allowed to have an error of 10° or less, the valve body unit 20 includes a seal portion 21 and a second contact portion 22, the seal portion 21 is a seal ring for sealing the valve port 41, and the second contact portion 22 contacts the first contact portion 12 to limit the maximum closed position of the valve body unit 20, when the valve body unit 20 is in the maximum closed position, the opening of the valve port 41 is 0%, that is, the first working position of the valve device, referring to Figure 2, the seal portion 21 contacts the valve port 40, in other words, contacts it to seal, and the valve seat unit 30 can limit the circumferential rotation of the valve body unit 20. In contrast to the valve body being simply braked by collision with the valve opening, in the embodiment of this application, the first contact portion 12 of the screw rod unit 10 abuts against the second contact portion 22 of the valve body unit 20 along the circumferential direction of the valve device 100, thereby restricting the circumferential rotation of the screw rod unit 10 and further restricting the maximum closed position of the valve body unit 20, i.e., the lowest end position of the valve body unit 20 relative to the first contact portion 12, thereby restricting collision between the valve body unit and the valve opening, reducing wear of the seal portion 21, and improving the sealing effect of the valve device 100.

[0013] Here, the rod body 11 and the first contact portion 12 may be connected in a position-restricted manner. Specifically, referring to Figure 8, the first contact portion 12 is provided with an engagement hole 13 or an engagement groove, a part of the rod body 11 is located in the engagement hole 13, and the rod body 11 includes a first stage portion 17 and a bent portion, and along the axial direction of the valve device 100, the first stage portion 17 and the bent portion sandwich the first contact portion 12. The rod body 11 and the first contact portion 12 may be an integral structure. Specifically, referring to Figure 9, the rod body 11 and the first contact portion 12 are an integral structure, and the first contact portion 12 protrudes radially from the rod body 11, reducing the number of components. The valve unit 20 includes a valve body 25 and a seal portion 21. The seal portion 21 and the valve body 25 may be an integral structure or may be arranged as separate parts. When the seal portion 21 and the valve body 25 are arranged as separate parts, the seal portion 21 and the valve body 25 are fixedly connected or connected in a position-restricted manner. Specifically, referring to Figure 6, the seal portion 21 is a seal ring 21, the valve body 25 is a metal structure, and at least a portion of the seal ring 21 is located in the first groove 280 of the valve body 25. The first contact portion 12 of the screw rod unit 10 may be in contact with the second contact portion 22 of the valve body unit 20 along the axial direction, where the axial direction is the axial direction of the valve device 100, and referring to Figure 8, the valve body unit 20 is in the maximum closed position, and along the axial direction of the valve device 100, the first contact portion 12 is located on one side of the second contact portion 22 and is in contact with the second contact portion 22 along the axial direction, thereby limiting the maximum closed position of the valve body unit 20.

[0014] In some embodiments, referring to Figure 2, the valve seat unit 30 comprises a housing chamber 31 and a first passage 32, and along the axial direction of the valve device 100, the housing chamber 31 and the first passage 32 are located on different sides of the valve body unit 20, the first passage 32 forms at least a portion of the valve opening 41, the valve body unit 20 comprises a balance passage 23, the second contact portion 22 forms a portion of the wall of the balance passage 23, the balance passage 23 communicates with the housing chamber 31, and when the valve body unit 20 is in the maximum closed position, the balance passage 23 communicates with the first passage 32, and at least a portion of the first contact portion 12 is located in the balance passage 23. The working medium in the first passage 32 applies pressure to the valve body unit 20, and the valve body unit 20 is positioned to have a balance passage 23. This allows the working medium in the first passage 32 to flow into the housing chamber 31 via the balance passage 23, reducing or eliminating the pressure difference at both ends of the valve body unit 20 in the axial direction and balancing the operation of the valve body unit 20. Meanwhile, the second contact portion 22 is positioned to form part of the wall of the balance passage 23. This means that when the valve body unit 20 is in the maximum closed position, at least a portion of the first contact portion 12 is located in the balance passage 23, improving space utilization and making the structure of the valve device 100 more compact. The first contact portion 12 may always be located in the balance passage 23.

[0015] Referring to FIGS. 2, 3 and 7, the valve device 100 includes a bearing 50. The valve seat unit 30 has a mounting hole 33. At least a part of the bearing 50 is located in the mounting hole 33. The bearing 50 includes an inner ring 51 and an outer ring 52. The inner ring 51 can rotate relative to the outer ring 52. The outer ring 52 is fixed and connected to the wall of the mounting hole 33. A part of the screw rod unit 10 is located in the hole of the inner ring 51. The screw rod unit 10 is fixed and connected to the inner ring 51. The bearing 50 can limit the axial displacement or displacement amount of the screw rod unit 10. The valve body unit 20 includes a female screw portion 24 that is screwed with the screw rod unit 10. Along the axial direction of the valve device 100, the first abutting portion 12 and the second abutting portion 22 are located on the same side of the female screw portion 24. Specifically, along the axial direction of the valve device 100, the first abutting portion 12 is away from the bearing 50 with respect to the female screw portion 24, and the second abutting portion 22 is away from the bearing 50 with respect to the female screw portion 24. Thereby, the distance from the female screw portion 24 to the bearing 50 is shortened, the operation stability of the screw rod unit 10 is improved, and the radial sway of the screw rod unit 10 is reduced. In one embodiment of the present application, it further includes a fixing and position limiting portion. The fixing and position limiting portion is located above the female screw portion 24 and is fixed and connected to the valve body 25. The fixing method includes welding and riveting. The fixing and position limiting portion can abut against the female screw portion 25 and perform position limiting with respect to the axial direction of the female screw portion.

[0016] Here, the rod body 11 of the screw rod unit 10 includes a male screw portion 16. The screw gap between the female screw portion 24 of the valve body unit 20 and the male screw portion 16 may be used as a part of the balance passage 23. In order to increase the flow space of the balance passage 23, the female screw portion 24 may be provided with a communication hole for the working medium to flow through. The communication hole communicates with the accommodation chamber 31 and the first through hole 26. Along the axial direction of the valve device 100, the first abutting portion 12 approaches the bearing 50 with respect to the female screw portion 24, and the second abutting portion 22 approaches the bearing 50 with respect to the female screw portion 24. Referring to FIG. 10, along the axial direction of the valve device 100, the first abutting portion 12 is away from the valve port portion 40 with respect to the female screw portion 24, and the second abutting portion 22 is away from the valve port portion 40 with respect to the female screw portion 24.

[0017] Referring to FIG. 6, the valve body unit 20 includes a valve body 25 and an internal thread portion 24. The internal thread portion 24 and the valve body 25 are arranged separately, and the two are fixedly connected or connected so as to be position-limited. Specifically, the valve body 25 is made of a metal material and has a first through hole 26. The internal thread portion 24 is made of a plastic material, and at least a part of the internal thread portion 24 is located in the first through hole 26. The internal thread portion 24 and the valve body 25 are injection-molded or connected so as to be position-limited. The internal thread portion 24 and the valve body 25 form at least a part of the wall of the balance passage 23. The valve body 25 and the seal portion 21 are fixedly connected or connected so as to be position-limited, or are of an integral structure. The internal thread portion 24 and the external thread portion 16 of the screw rod unit 10 are screwed together, thereby reducing the wear between the internal thread portion 24 and the external thread portion 16 and extending the service life of the valve device 100.

[0018] Referring to FIG. 6, the second abutting portion 22 of the valve body unit 20 and the internal thread portion 24 are of an integral structure. The internal thread portion 24 and the second abutting portion 22 are made of a plastic material. Specifically, the thread portion 24 and the second abutting portion 22 are made of plastic. The internal thread portion 24 and the second abutting portion 22 are injection-molded as a whole. The hardness of the internal thread portion 24 and the second abutting portion 22 is smaller than that of the valve body 25. Along the axial direction of the valve device 100, the second abutting portion 22 is arranged to protrude from the internal thread portion 24 toward the first abutting portion 12 and abut against the first abutting portion 12 of the screw rod unit 10 along the circumferential direction. Thereby, the maximum valve closing position of the valve body unit 20 is limited. By arranging the internal thread portion 24 and the second abutting portion 22 to be injection-molded as a whole, while facilitating the processing and manufacturing of the second abutting portion 22, for the metal material, the second abutting portion 22 is a plastic material, and the noise caused by the collision between the second abutting portion 22 and the first abutting portion 12 can be reduced.

[0019] In another embodiment, referring to Figure 8, the second contact portion 22 and the valve body 25 are integrally structured and both are made of metal. Along the radial direction of the valve device 100, the second contact portion 22 is positioned to protrude toward the screw rod unit 10 relative to the valve body 25. The second contact portion 22 forms part of the wall of the first through hole 26 and abuts toward the first contact portion 12 of the screw rod unit 10 along the circumferential direction. This limits the maximum closed position of the valve body unit 20. The structure of the second contact portion 22 is simple and easy to manufacture, while the structural strength of the second contact portion 22 is improved because it is made of metal, thereby increasing the positional accuracy of the valve body unit 20 at its maximum closed position. Here, the second contact portion 22 may abut toward the first contact portion 12 of the screw rod unit 10 along the axial direction. Here, the female screw portion 24 and the valve body 25 may be an integrated structure. Referring to Figure 10, the female screw portion 24 and the valve body 25 are made of metal and are an integrated structure.

[0020] Referring to Figures 5 and 6, the screw rod unit 10 includes a rod body 11 and a first contact portion 12, which are arranged separately, the first contact portion 12 having an engagement hole 13, a portion of the rod body 11 being located in the engagement hole 13, the rod body 11 being welded to or press-fitted into the wall of the engagement hole 13, the first contact portion 12 including an extension portion 14 which is arranged to extend radially along the valve device 100 to the valve body 25, and the valve seat unit 30 restricts the circumferential rotation of the valve body unit 20. When the valve body unit 20 is in the maximum closed position, the extended portion 14 abuts against the second contact portion 22 along the circumferential direction of the valve device 100, thereby restricting the circumferential rotation of the screw rod unit 10 and further restricting the maximum closed position of the valve body unit 20. The first contact portion 12 and the rod body 11 are arranged as separate components, and the first contact portion 12 is arranged to include an extended portion that extends radially, which simplifies the structure of the first contact portion 12 and makes it easy to manufacture. In another specific embodiment, referring to Figures 11 and 12, the first contact portion 12 is provided with a position limiting hole 15, which opens toward the female screw portion 24 and is arranged to extend along the circumferential direction of the valve device 100. When the valve body unit 20 is in the maximum closed position, at least a portion of the second contact portion 22 is located in the position limiting hole 15, and along the circumferential direction of the valve device 100, the second contact portion 22 abuts against the wall of the position limiting hole 15, thereby limiting the circumferential rotation of the screw rod unit 10 and further limiting the maximum closed position of the valve body unit 20. Here, the first contact portion 12 and the rod body 11 may be an integral structure.

[0021] Referring to Figure 8, the screw rod unit 10 includes a rod body 11 and a first contact portion 12, which are arranged separately. The rod body 11 includes a male threaded portion 16 and a first stage portion 17. The male threaded portion 16 is screwed into the female threaded portion 24 of the valve body unit 20. Along the axial direction of the valve device 100, the first stage portion 17 approaches the first contact portion 12 relative to the male threaded portion 16, and along the axial direction of the valve device 100, the first contact portion 12 abuts against the first stage portion 17. The first stage portion 17 can limit the axial position of the first contact portion 12, facilitating the assembly and positioning of the first contact portion 12 and improving the positional accuracy of the valve body unit 20 when the valve is closed.

[0022] Referring to Figure 6, the valve unit 20 includes a valve body 25 and a seal portion 21. The valve body 25 includes an outer wall 27 and a first groove portion 28. The first groove portion 28 opens into the outer wall 27, and the seal portion 21 and the valve body 25 are arranged separately. Specifically, the seal portion 21 is a rubber seal ring, a plastic seal member, etc., and at least a part of the seal portion 21 is located in the first groove 280 of the first groove portion 28. When the valve unit 20 is in the maximum closed position, the first groove portion 28 and the valve opening portion 40 are sealed together. The seal portion 21 is tightened to further seal the valve opening 41 and set the opening of the valve opening 41 to 0%, specifically the valve opening portion 40 includes an inner wall 42, the valve opening portion 40 is provided with a first passage 32, the wall forming the first passage 32 includes the inner wall 42, the first passage 32 forms at least a portion of the valve opening 41, and when the valve body unit 20 is in the maximum closed position, a portion of the valve body unit 20 is located in the first passage 32, and along the radial direction of the valve device 100, the inner wall 42 and the first groove portion 28 tighten the seal portion 21.

[0023] In some embodiments, referring to Figure 10, the sealing portion 21 includes a coating layer 210, which is made of a plastic material and adheres to the surface of the valve body 25. When the valve body unit 20 is in the fully closed position, the coating layer 210 contacts the valve opening 40 to seal. Here, the sealing portion 21 may further include a vulcanization layer 210, which is formed by vulcanizing at least the valve body 25 as a substrate. When the valve body unit 20 is in the fully closed position, the vulcanization layer 210 contacts the valve opening 40 to seal. By arranging the sealing portion 21 to include a coating layer 210 or a vulcanization layer 210, the sealing effect of the valve device 100 can be improved.

[0024] Herein, the above embodiments are not intended to limit the technical methods described in the present invention, but are merely used to illustrate the present invention. Although the present invention has already been described in detail in this specification with reference to the above embodiments, as those skilled in the art will understand, amendments or equivalent substitutions may still be made to the present invention, and all technical methods and improvements thereof that do not depart from the spirit and scope of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A valve device comprising a screw rod unit (10), a valve body unit (20), and a valve seat unit (30), wherein the screw rod unit (10) and the valve body unit (20) are screwed together, the valve seat unit (30) includes a valve port (40), the valve body unit (20) is capable of adjusting the opening degree of the valve port (41) of the valve port (40), the screw rod unit (10) includes a rod body (11) and a first contact portion (12), and the rod body (11) and the first contact portion (12) are fixed together. A valve device in which the first contact portion (12) is arranged to protrude from the rod body (11) along the radial direction of the valve device, the valve body unit (20) includes a seal portion (21) and a second contact portion (22), the valve device includes a first working position, and when the valve device is in the first working position, the seal portion (21) is in contact with the valve port (40), and along the axial or circumferential direction of the valve device, the first contact portion (12) is in contact with the second contact portion (22).

2. The valve seat unit (30) comprises a housing chamber (31) and a first passage (32), and the housing chamber (31) and the first passage (32) are located on different sides of the valve body unit (20) along the axial direction of the valve device, the first passage (32) forms at least a part of the valve opening (41), the valve body unit (20) comprises a balance passage (23), the second contact portion (22) forms a part of the wall of the balance passage (23), the balance passage (23) communicates with the housing chamber (31), and when the valve body unit (20) is in the maximum closed position, the balance passage (23) communicates with the first passage (32), and at least a part of the first contact portion (12) is located in the balance passage (23), as described in claim 1.

3. The valve device according to claim 1 or 2, wherein the valve seat unit (30) can restrict the rotation of the valve body unit (20) along the circumferential direction of the valve device, the valve body unit (20) includes a female screw portion (24) that is screwed into the screw rod unit (10), and the first contact portion (12) and the second contact portion (22) are located on the same side of the female screw portion (24) along the axial direction of the valve device.

4. The valve device according to claim 3, characterized in that the valve device includes a bearing (50), the valve seat unit (30) has a mounting hole (33), at least a portion of the bearing (50) is located in the mounting hole (33), the bearing (50) includes an inner ring (51) and an outer ring (52), the inner ring (51) is rotatable relative to the outer ring (52), the outer ring (52) is fixedly connected to the wall of the mounting hole (33), a portion of the screw rod unit (10) is located in a hole in the inner ring (51), the screw rod unit (10) is fixedly connected to the inner ring (51), and along the axial direction of the valve device, the first contact portion (12) is away from the bearing (50) relative to the female screw portion (24), and the second contact portion (22) is away from the bearing (50) relative to the female screw portion (24).

5. The valve body unit (20) includes a valve body (25), and the female screw portion (24) and the valve body (25) are fixedly connected, or connected in a way that restricts their position, or are integrally structured, and the valve body (25) and the seal portion (21) are fixedly connected, or connected in a way that restricts their position, or are integrally structured. The second contact portion (22) and the female screw portion (24) are integrally structured, and along the axial direction of the valve device, the second contact portion (22) is arranged to protrude toward the first contact portion (12) relative to the female screw portion (24). Alternatively, the second contact portion (22) and the valve body (25) are integrally structured, and the second contact portion (22) is arranged to protrude toward the screw rod unit (10) relative to the valve body (25) along the radial direction of the valve device. Alternatively, the valve device according to claim 3 or 4, characterized in that the second contact portion (22) and the female screw portion (24) are integrally structured, and when the valve body unit (20) is in the maximum closed position, the first contact portion (12) is located on one side of the second contact portion (22) along the axial direction of the valve device.

6. The female threaded portion (24) and the valve body (25) are arranged as separate components, the valve body (25) is provided with a first through hole (26), at least a portion of the female threaded portion (24) is located in the first through hole (26), the female threaded portion (24) and the valve body (25) are injection molded or connected in a position-restricted manner, and the female threaded portion (24) and the valve body (25) form at least a portion of the wall of the balance passage (23). The valve device according to claim 5, characterized in that the female screw portion (24) is made of a plastic material, the second contact portion (22) is made of a plastic material, or the valve body (25) is made of a metallic material, the second contact portion (22) is made of a metallic material, and the second contact portion (22) forms a part of the wall of the first through hole (26).

7. The rod body (11) and the first contact portion (12) are arranged as separate components, the first contact portion (12) is provided with an engagement hole (13), a part of the rod body (11) is located in the engagement hole (13), and the rod body (11) is welded to or fitted into the wall of the engagement hole (13). The first contact portion (12) includes an extending portion (14) that is arranged to extend toward the valve body (25) along the radial direction of the valve device, and when the valve body unit (20) is in the maximum closed position, the extending portion (14) abuts toward the second contact portion (22) along the circumferential direction of the valve device. Alternatively, the valve device according to claim 5 or 6, characterized in that the first contact portion (12) is provided with a position limiting hole (15) that opens toward the female screw portion (24), and when the valve body unit (20) is in the maximum closed position, at least a portion of the second contact portion (22) is located in the position limiting hole (15), and the second contact portion (22) abuts against the wall of the position limiting hole (15) along the circumferential direction of the valve device.

8. The valve device according to claim 7, wherein the rod body (11) includes a male threaded portion (16) and a first stage portion (17), the male threaded portion (16) is screwed with the female threaded portion (24), the first stage portion (17) approaches the first contact portion (12) relative to the male threaded portion (16) along the axial direction of the valve device, and the first contact portion (12) abuts against the first stage portion (17) along the axial direction of the valve device.

9. The valve body unit (20) includes a valve body (25), the valve body (25) includes an outer wall (27) and a first groove (28), the first groove (28) opens at the outer wall (27), the seal portion (21) and the valve body (25) are arranged separately, at least a part of the seal portion (21) is located in the first groove (280) of the first groove (28), and when the valve body unit (20) is in the maximum closed position, the first groove (28) and the valve opening (40) tighten the seal portion (21). Alternatively, the sealing portion (21) includes a coating layer (210), the coating layer (210) is made of a plastic material, and when the valve body unit (20) is in the maximum closed position, the coating layer (210) contacts the valve opening portion (40) to seal. Alternatively, the valve device according to any one of claims 1 to 8, characterized in that the sealing portion (21) includes a vulcanized layer (210), and when the valve body unit (20) is in the maximum closed position, the vulcanized layer (210) contacts the valve opening portion (40) in a sealing manner.

10. The valve device includes a rotor unit (60) that is fixedly connected to the screw rod unit (10). One of the valve seat unit (30) and the valve body unit (20) includes a position limiting groove (61), and the other includes a position limiting portion (62), wherein the position limiting groove (61) is arranged to extend along the axial direction of the valve device, at least a portion of the position limiting portion (62) is located in the position limiting groove (61), and along the circumferential direction of the valve device, the wall of the position limiting groove (61) is provided to be in contact with or have a gap with the position limiting portion (62), The valve device according to claim 9, characterized in that the valve port (40) includes an inner wall (42), the valve port (40) has a first passage (32), the wall forming the first passage (32) includes the inner wall (42), the first passage (32) forms at least a part of the valve port (41), when the valve body unit (20) is in the maximum closed position, a part of the valve body unit (20) is located in the first passage (32), and the inner wall (42) and the first groove (28) tighten a seal portion (21) along the radial direction of the valve device.

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