Manual vacuum baffle valve

Abstract

The invention relates to the technical field of manual vacuum flapper valves, in particular to a manual vacuum flapper valve which comprises a valve body provided with a mounting opening, a first flange connector and a second flange connector. The hand wheel assembly is arranged outside the valve body; the valve plate is movably arranged in the valve body; the sealing seat is arranged in the valve body, and a mounting channel is formed in the sealing seat; the first end of the transmission rod penetrates through the mounting opening and extends into the valve body, and the second end of the transmission rod is connected with the hand wheel assembly; the lead screw is movably arranged in the valve body, and the lead screw penetrates through the mounting channel; one end of the lead screw is in threaded connection with the transmission rod, and the other end is connected with the valve plate; wherein the lead screw is provided with a first limiting structure, the mounting channel is provided with a second limiting structure, and the first limiting structure and the second limiting structure are matched with each other to form a rotation restraining mechanism which is used for limiting the lead screw to circumferentially rotate relative to the sealing seat.

Description

Technical Field

[0001] The present application relates to the technical field of vacuum baffle valves, and in particular to a manual vacuum baffle valve. Background Art

[0002] The vacuum baffle valve operates by connecting or disconnecting airflow in vacuum lines through the lifting and lowering motion of the valve plate. Its advantages include excellent sealing performance and high flow conductance, making it widely used in the semiconductor industry, optical thin film preparation, vacuum heat treatment equipment, and the photovoltaic industry.

[0003] Vacuum flapper valves can be categorized by drive method as manual, pneumatic, electromagnetic, or electric. Electromagnetic vacuum flapper valves utilize an electromagnet adsorption module as their drive module. Once the valve is open, they consume power to maintain the electromagnetic coil open. This magnet generates loud noise and vibration during adsorption, which can affect the performance of the vacuum equipment and degrade the user experience. Pneumatic vacuum flapper valves require an air compressor as their drive and are connected by long air lines, making them complex to maintain. Furthermore, air compressors often have drawbacks such as large size, high noise levels, and high vibration during cyclic operation. Electric vacuum flapper valves require complex mechanical transmission and electronic control systems, resulting in high manufacturing and maintenance costs.

[0004] Patent No. 2024105785384 discloses a manual vacuum baffle valve, including a valve body, a valve plate, a guide bracket, a rotating knob, a rotating disk, a fixing nut, a rotating rod, a lifting sleeve, a driving rod, and a spring. The manual vacuum baffle valve of the present invention only requires about 1 / 4 turn from valve closing to full opening, which greatly saves the time required for the valve to fully open from closing. At the same time, it uses spring compression in the clamping stage to ensure reliability. At the same time, it uses grease with a low friction coefficient to convert the spring compression force that needs to be overcome to manually close the valve into an extremely low rotational friction force, thereby making the entire process of the manual vacuum baffle valve from closing to opening both time-saving and labor-saving. The clamping force in the above patent is completely dependent on the spring. The spring is in a compressed state for a long time and is prone to fatigue failure, which leads to a decrease in the reliability of the valve seal. Summary of the Invention

[0005] In view of the deficiencies or problems existing in the prior art, the present disclosure provides a manual vacuum baffle valve with a simple structure and reliable sealing.

[0006] The technical solution adopted by the present disclosure to solve the above technical problems is: a manual vacuum baffle valve, comprising: A valve body is provided with a mounting port, a first flange interface and a second flange interface; A handwheel assembly is provided on the outside of the valve body; A valve plate is movably arranged inside the valve body and is used to connect or block the passage between the first flange interface and the second flange interface; A sealing seat is provided inside the valve body and has an installation channel; A transmission rod, a first end of which extends through the mounting opening into the interior of the valve body and a second end of which is connected to the handwheel assembly, wherein the handwheel assembly is used to drive the transmission rod to rotate around its axis; A lead screw is movably disposed inside the valve body and passes through the installation passage; one end of the lead screw is connected to the transmission rod through a thread, and the other end is connected to the valve plate; In which, a first limiting structure is provided on the screw, and a second limiting structure is provided on the mounting channel. The first limiting structure and the second limiting structure cooperate with each other to form a rotation constraint mechanism, which is used to limit the circumferential rotation of the screw relative to the sealing seat, while allowing the screw to move along its axial direction; the valve plate synchronously performs axial linear motion under the drive of the screw.

[0007] As a preferred embodiment, a sealing surface is provided at the bottom of the inner cavity of the valve body, the first flange interface is provided on the sealing surface, and the valve plate moves up and down following the screw. When the valve plate moves downward until it contacts the sealing surface, the channel between the first flange interface and the second flange interface is blocked.

[0008] As a preferred embodiment, an annular opening groove is provided at the bottom of the valve plate, and a sealing ring is provided in the annular opening groove.

[0009] As a preferred embodiment, the sealing seat includes an integrally formed connecting portion and a accommodating portion, the connecting portion is disc-shaped, the accommodating portion is columnar, the inner cavity circumferential wall of the valve body is provided with an annular groove for installing the sealing seat, the outer edge of the connecting portion is embedded in the annular groove, and the installation channel is a channel that passes axially through the center of the accommodating portion.

[0010] As a preferred embodiment, the second limiting structure is composed of two second cut surfaces formed on the surface of the installation channel, and the two second cut surfaces are arranged opposite to each other.

[0011] As a preferred embodiment, the lead screw includes an integrally formed first rod body and a second rod body, the diameter of the first rod body is smaller than that of the second rod body, the first rod body is connected to the transmission rod, and the first limiting structure is provided on the second rod body.

[0012] As a preferred embodiment, the first limiting structure is composed of two first sections formed on the outer surface of the second rod, the two first sections are arranged opposite to each other, and the first section is arranged corresponding to the second section to limit the circumferential rotation of the screw relative to the sealing seat.

[0013] As a preferred embodiment, a connecting hole is provided at the axial end of the transmission rod, an inner wall of the connecting hole is formed with an internal thread, and an outer wall of the first rod body is provided with an external thread, and the internal thread and the external thread are screwed together to connect the transmission rod to the screw.

[0014] As a preferred embodiment, a locking piece is further included, a connecting groove is provided on the side wall of the transmission rod, a first through hole is provided on the handwheel assembly, and the locking piece connects the transmission rod and the handwheel assembly through the first through hole and the connecting groove.

[0015] As a preferred embodiment, the handwheel assembly includes an integrally formed cover, a first sleeve and a second sleeve. The first sleeve and the second sleeve are cylindrical structures extending axially along the cover. The first sleeve is coaxially arranged on the outside of the second sleeve. The height of the first sleeve is smaller than the height of the second sleeve. The first through hole is arranged on the second sleeve, and the transmission rod is at least partially located inside the second sleeve.

[0016] As a preferred embodiment, a gripping portion is provided on the first sleeve.

[0017] As a preferred embodiment, a copper sleeve is provided between the second sleeve and the transmission rod, and a second through hole is provided on the copper sleeve. The central axis of the first through hole, the central axis of the second through hole and the central axis of the connecting groove are located in the same plane perpendicular to the axial direction.

[0018] Compared with the prior art, the beneficial effects of the present application are: the present application directly drives the valve plate through the screw, and there is no intermediate loss in the force transmission path; the cooperation of the first limiting structure and the second limiting structure converts the rotational motion of the handwheel assembly into the linear motion of the screw, thereby driving the valve plate to move axially to realize the opening or closing of the channel, and the valve plate is pressed by the screw, so that the clamping force of the valve plate is more reliable; the present application does not require complex transmission components such as connecting rods and gear boxes, reduces the number of parts, and reduces the impact of assembly errors on vacuum performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a manual vacuum baffle valve for this application; Figure 2 A cross-sectional view of a manual vacuum baffle valve according to the present application; Figure 3 This is a schematic diagram of the structure of the handwheel assembly of this application; Figure 4 This is a schematic diagram of the structure of the transmission rod of this application; Figure 5 This is a schematic diagram of the structure of the lead screw in this application; Figure 6 This is a cross-sectional view of the sealing seat of this application.

[0020] In the figure: 1. valve body; 2. first flange interface; 3. second flange interface; 4. handwheel assembly; 5. sealing seat; 6. transmission rod; 7. valve plate; 8. screw; 9. cover-shaped member; 10. first sleeve; 11. second sleeve; 12. deep groove ball bearing; 13. copper sleeve; 14. gripping portion; 15. first through hole; 16. connecting groove; 17. connecting hole; 18. first rod body; 19. second rod body; 20. first limiting structure; 21. connecting portion; 22. accommodating portion; 23. mounting channel; 24. second limiting structure; 25. valve cover; 26. housing. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is described in detail, clearly, and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not intended to limit the present disclosure.

[0022] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0023] Please see Figure 1 、 Figure 2 、 Figure 5 and Figure 6As shown, the present application discloses a manual vacuum baffle valve, comprising a valve body 1, which is provided with a mounting port, a first flange interface 2 and a second flange interface 3, a handwheel assembly 4 is provided on the outside of the valve body 1, and a valve plate 7, a sealing seat 5 and a screw 8 are provided inside the valve body 1, wherein the valve plate 7 and the screw 8 are movably arranged inside the valve body 1, and the valve plate 7 is used to connect or block the channel between the first flange interface 2 and the second flange interface 3; a mounting channel 23 is opened on the sealing seat 5; a transmission rod 6 is further provided on the valve body 1, a first end of the transmission rod 6 extends to the inside of the valve body 1 through the mounting port, and the second end is connected to the handwheel assembly 4, and the hand The wheel assembly 4 is used to drive the transmission rod 6 to rotate around its axis; the screw 8 passes through the installation channel 23; one end of the screw 8 is connected to the transmission rod 6 by a thread, and the other end is connected to the valve plate 7; a first limiting structure 20 is provided on the screw 8, and a second limiting structure 24 is provided on the installation channel 23. The first limiting structure 20 and the second limiting structure 24 cooperate with each other to constitute a rotation constraint mechanism for limiting the circumferential rotation of the screw 8 relative to the sealing seat 5, while allowing the screw 8 to move along its axial direction, that is, the rotation constraint mechanism converts the circumferential motion of the screw 8 into axial motion; the valve plate 7 synchronously performs axial linear motion under the drive of the screw 8. The transmission rod 6 is connected to the lead screw 8 by a threaded connection. When the handwheel assembly 4 drives the transmission rod 6 to rotate, the lead screw 8 is constrained by the first limiting structure 20 and the second limiting structure 24 (cannot rotate circumferentially), and will convert the rotational motion of the transmission rod 6 into its own axial linear motion, thereby driving the valve plate 7 to move axially synchronously, thereby achieving "connectivity" or "blocking" of the channel, avoiding "idling" or "stuck" during the transmission process, and ensuring that the rotation of the handwheel can be directly and stably converted into the linear displacement of the valve plate 7, with higher control accuracy (such as rapid cutting off or slow adjustment of the airflow in the vacuum system). The first limiting structure 20 and the second limiting structure 24 not only limit the circumferential rotation of the lead screw 8, but also provide guidance for the axial movement of the lead screw 8, preventing the lead screw 8 from offsetting or shaking during movement, and reducing friction and wear with the sealing seat 5 and the valve body 1. The present application does not require complex transmission components such as connecting rods and gear boxes, reducing the number of parts and reducing the impact of assembly errors on vacuum performance.

[0024] It should be noted that a floating connection structure is provided between the lead screw 8 and the valve plate 7. The valve plate 7 is connected to the lead screw 8 via the floating connection structure. The floating connection structure allows the valve plate 7 to deflect relative to the lead screw 8 within a predetermined angular range and to rotate slightly about the axis of the lead screw 8. This is used to automatically compensate for and eliminate assembly parallelism errors between the valve plate 7 and the sealing surface when the valve plate 7 is pressed together, ensuring uniform contact between the valve plate 7 and the sealing surface and improving sealing reliability. Specifically, the floating connection structure of this application is a commonly used structure in the prior art. For example, the floating connection structure includes a ball head fixed to the end of the lead screw 8 and a ball socket connected to the valve plate 7. The ball head is accommodated in the ball socket, and the two form a spherical fit. For another example, the floating connection structure uses a spherical bearing. The inner ring of the spherical bearing is fixed to the lead screw 8, and the outer ring is fixed to the valve plate 7. The inner and outer rings are allowed to deflect and rotate relative to each other. The floating connection structure can also be other structures in the prior art, and this application does not specifically limit the floating connection structure.

[0025] Furthermore, the first flange interface 2 is arranged opposite to the mounting port, and the second flange interface 3 is arranged on one side of the valve body 1. The axis of the first flange interface 2 is perpendicular to the axis of the second flange interface 3, that is, the vacuum baffle valve is a right-angle valve, which can achieve pipeline turning without the need for additional pipe elbows, and can greatly reduce the space occupied by the pipeline at the turning point. A sealing surface is provided at the bottom of the inner cavity of the valve body 1, and the first flange interface 2 is integrated on the sealing surface. The valve plate 7 moves linearly along the axial direction following the screw 8. When the valve plate 7 is driven by the screw 8 to move downward to form a sealing contact with the sealing surface, the channel between the first flange interface 2 and the second flange interface 3 is sealed and blocked. It can be understood that an annular opening groove is provided at the bottom of the valve plate 7, and a sealing ring is provided in the annular opening groove. When the valve plate 7 is driven by the screw 8 to move downward to contact the sealing surface, the sealing ring fits tightly with the sealing surface. Turn the handwheel assembly 4, and the transmission rod 6 rotates with it. Driven by the transmission rod 6, the lead screw 8 moves linearly in the axial direction, and the valve plate 7 moves linearly in the axial direction along with the lead screw 8. When the valve plate 7 moves downward until the sealing ring on it contacts the sealing surface, the passage between the first flange interface 2 and the second flange interface 3 is blocked, and the manual vacuum damper valve is closed. Turn the handwheel assembly 4 in the opposite direction, and the valve plate 7 moves upward until the sealing ring separates from the sealing surface. The passage between the first flange interface 2 and the second flange interface 3 is connected, and the manual vacuum damper valve is opened.

[0026] Please continue to see Figure 6As shown, in particular, the sealing seat 5 includes an integrally formed connecting portion 21 and a receiving portion 22. The connecting portion 21 is disc-shaped, and the receiving portion 22 is columnar. The inner cavity circumferential wall of the valve body 1 is provided with an annular groove for mounting the sealing seat 5. The outer edge of the connecting portion 21 is embedded in the annular groove, and the mounting channel 23 is a channel that runs axially through the center of the receiving portion 22. The connecting portion 21 and the receiving portion 22 are integrally formed, avoiding the assembly gap or insufficient connection strength that may exist in the split structure, and the overall rigidity is stronger. The outer edge of the disc-shaped connecting portion 21 is embedded in the annular groove of the valve body 1. The position of the sealing seat 5 is precisely fixed through the circumferential constraint and axial limitation of the annular groove. In this way, no additional fasteners (such as bolts) are required, which simplifies assembly and avoids displacement of the sealing seat 5 due to loosening of the fasteners. The second limiting structure 24 is composed of two second sections formed on the surface of the mounting channel 23, and the two second sections are arranged opposite to each other.

[0027] Please see Figure 2 and Figure 5 As shown, it should be noted that the lead screw 8 includes an integrally formed first rod body 18 and a second rod body 19. The diameter of the first rod body 18 is smaller than that of the second rod body 19. The first rod body 18 is connected to the transmission rod 6, and a first limiting structure 20 is provided on the second rod body 19. The first rod body 18 has a smaller diameter and is used for connecting to the transmission rod 6 through a thread. The smaller diameter can reduce the contact area of ​​the threaded fit, reduce the friction resistance during the transmission process, and make the handwheel drive more labor-saving. Specifically, the first limiting structure 20 is composed of two first sections formed on the outer surface of the second rod body 19. The two first sections are arranged opposite to each other, and the first section is arranged corresponding to the second section to limit the circumferential rotation of the lead screw 8 relative to the sealing seat 5. The second rod body 19 has a larger diameter and serves as the main load-bearing and guiding component. The first section provided on its surface (cooperating with the second section of the sealing seat 5) can provide a larger contact area, thereby enhancing the stability of the circumferential rotation constraint. When the transmission rod 6 rotates, the two opposing first and second sections transmit the constraint force through surface contact, preventing the screw 8 from undergoing local deformation due to uneven force, thereby ensuring that the rotational motion is efficiently converted into axial linear motion. Through the mutual cooperation of the first and second sections, when the screw 8 tends to rotate due to the drive rod 6, the interference between the first and second sections directly prevents its rotation, ensuring that the screw 8 can only move in the axial direction, thereby improving the transmission efficiency. In addition, the section structure is simple and the processing difficulty is low (no complex keyway or spline is required).

[0028] like Figure 1 、 Figure 2 and Figure 4As shown, the axial end of the transmission rod 6 is provided with a connecting hole 17, the inner wall of which is formed with an internal thread. The outer wall of the first rod body 18 is provided with an external thread. The internal and external threads screw together to connect the transmission rod 6 to the lead screw 8. The threaded engagement converts rotational motion into axial linear motion of the lead screw 8, which in turn drives the valve plate 7 to open and close, thereby connecting or blocking the vacuum channel.

[0029] The valve body 1 includes a bonnet 25 and a housing 26 disposed below the bonnet 25. The bonnet 25 is positioned between the handwheel assembly 4 and the housing 26. Both the first and second flange interfaces 2 and 3 are provided on the housing 26, with a mounting port provided on the bonnet 25. An annular groove is located above the second flange interface 3. The annular groove can be provided on the housing 26 or formed by combining the recessed portion of the connection between the bonnet 25 and the housing 26. A deep groove ball bearing 12 is disposed within the bonnet 25, positioned between the housing 26 and the transmission rod 6. The inner ring of the deep groove ball bearing 12 mates with the transmission rod 6, while the outer ring mates with the inner wall of the bonnet 25. The transmission rod 6 rotates about its axis, while the bonnet 25 is a fixed component. Direct contact between the two components generates sliding friction, making the handwheel assembly 4 difficult to operate and affecting accuracy due to long-term wear. The deep groove ball bearing 12, through its steel balls, converts the sliding friction between the transmission rod 6 and the bonnet 25 into rolling friction, significantly reducing the coefficient of friction. In addition, the inner ring of the deep groove ball bearing 12 cooperates with the transmission rod 6, and the outer ring cooperates with the valve cover 25, which can accurately limit the radial movement of the transmission rod 6, ensure the stability of the axis of the transmission rod 6 during rotation, avoid eccentric wear or jamming of the threaded connection due to shaking, and thus ensure the smooth axial movement of the screw 8.

[0030] Please see Figures 1 to 4 As shown, the valve body 1 also includes a locking member located on the handwheel assembly 4. A connecting groove 16 is defined in the sidewall of the transmission rod 6. It is understood that the axis of the connecting groove 16 is perpendicular to the axis of the connecting hole 17, and the connecting groove 16 is located outside the valve body 1. The handwheel assembly 4 is defined by a first through hole 15, and the locking member connects the transmission rod 6 to the handwheel assembly 4 via the first through hole 15 and the connecting groove 16. Specifically, the locking member is a locking screw. The axis of the connecting groove 16 is perpendicular to the axis of the connecting hole 17 and is located outside the valve body 1. This does not affect the internal threaded connection between the transmission rod 6 and the lead screw 8, but allows the handwheel and transmission rod 6 to be secured using the space outside the valve body 1, avoiding structural interference and simplifying the internal layout.

[0031] Specifically, the handwheel assembly 4 includes an integrally formed cover 9, a first sleeve 10, and a second sleeve 11. The first sleeve 10 and the second sleeve 11 are cylindrical structures extending axially along the cover 9. The first sleeve 10 is coaxially arranged outside the second sleeve 11. The height of the first sleeve 10 is less than that of the second sleeve 11. A first through hole 15 is provided in the second sleeve 11, and the top of the transmission rod 6 is located inside the second sleeve 11. Preferably, a copper sleeve 13 is provided between the second sleeve 11 and the transmission rod 6. The copper sleeve 13 is provided with a second through hole. The central axis of the first through hole 15, the central axis of the second through hole, and the central axis of the connecting groove 16 are located in the same plane perpendicular to the axial direction. During the rotation of the handwheel assembly 4, the copper sleeve 13 and the transmission rod 6 rotate together with the handwheel assembly 4. The copper sleeve 13 is provided between the second sleeve 11 and the transmission rod 6 primarily to enhance the strength of the handwheel assembly.

[0032] like Figure 3 As shown, a grip portion 14 is provided on the first sleeve 10. Specifically, the grip portion 14 is a plurality of indentations evenly and spaced apart on the outer circumferential wall of the first sleeve 10. The indentations are equidistantly arranged along the circumference of the first sleeve 10. The shape of the grip portion 14 matches the contour of the fingertips when gripping the sleeve, thereby increasing the friction between the hand and the sleeve surface and providing a clear force fulcrum for the fingers, so that the user can exert force more stably when rotating the handwheel assembly 4, thereby improving the convenience and controllability of the operation.

[0033] The present application has been described in detail above. Specific examples have been used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is intended only to facilitate understanding of the present application and its core concepts. It should be noted that, without departing from the principles of the present application, a number of improvements and modifications may be made to the present application by a person skilled in the art, and such improvements and modifications shall fall within the scope of protection of the claims of the present application.

Claims

1. A manual vacuum baffle valve, characterized in that: include: A valve body (1) is provided with a mounting port, a first flange interface (2), and a second flange interface (3); A handwheel assembly (4) is provided outside the valve body (1); A valve plate (7) is movably arranged inside the valve body (1) and is used to connect or block the passage between the first flange interface (2) and the second flange interface (3); A sealing seat (5) is provided inside the valve body (1), and a mounting channel (23) is provided on the sealing seat (5); A transmission rod (6), a first end of which extends through the mounting opening into the interior of the valve body (1), and a second end of which is connected to the handwheel assembly (4), wherein the handwheel assembly (4) is used to drive the transmission rod (6) to rotate around its axis; A lead screw (8) is movably arranged inside the valve body (1), and the lead screw (8) passes through the mounting channel (23); one end of the lead screw (8) is connected to the transmission rod (6) through a thread, and the other end is connected to the valve plate (7); The lead screw (8) is provided with a first limiting structure (20), and the mounting channel (23) is provided with a second limiting structure (24). The first limiting structure (20) and the second limiting structure (24) cooperate with each other to form a rotation constraint mechanism for limiting the circumferential rotation of the lead screw (8) relative to the sealing seat (5) while allowing the lead screw (8) to move along its axial direction; the valve plate (7) synchronously performs axial linear motion under the drive of the lead screw (8).

2. The manual vacuum flapper valve according to claim 1, characterized in that: A sealing surface is provided at the bottom of the inner cavity of the valve body (1), the first flange interface (2) is provided on the sealing surface, and the valve plate (7) moves up and down following the lead screw (8). When the valve plate (7) moves downward until it contacts the sealing surface, the passage between the first flange interface (2) and the second flange interface (3) is blocked.

3. The manual vacuum flapper valve according to claim 1, characterized in that: The sealing seat (5) includes an integrally formed connecting portion (21) and a receiving portion (22), wherein the connecting portion (21) is disc-shaped and the receiving portion (22) is columnar. An annular groove for mounting the sealing seat (5) is provided on the inner cavity peripheral wall of the valve body (1), and the outer edge of the connecting portion (21) is embedded in the annular groove. The mounting passage (23) is a passage extending axially through the center of the receiving portion (22).

4. The manual vacuum flapper valve according to claim 3, characterized in that: The second limiting structure (24) is composed of two second cut surfaces formed on the surface of the installation channel (23), and the two second cut surfaces are arranged opposite to each other.

5. The manual vacuum flapper valve according to claim 1, characterized in that: The lead screw (8) comprises an integrally formed first rod body (18) and a second rod body (19), wherein the diameter of the first rod body (18) is smaller than that of the second rod body (19), the first rod body (18) is connected to the transmission rod (6), and the first limiting structure (20) is provided on the second rod body (19).

6. The manual vacuum baffle valve according to claim 4 or 5, characterized in that: The first limiting structure (20) is composed of two first sections formed on the outer surface of the second rod body (19), the two first sections being arranged opposite to each other, and the first section being arranged corresponding to the second section, so as to limit the circumferential rotation of the lead screw (8) relative to the sealing seat (5).

7. The manual vacuum flapper valve according to claim 5, characterized in that: A connecting hole (17) is provided at the axial end of the transmission rod (6), an inner wall of the connecting hole (17) is formed with an internal thread, and an outer wall of the first rod body (18) is provided with an external thread, and the internal thread and the external thread are screwed together to connect the transmission rod (6) to the lead screw (8).

8. The manual vacuum flapper valve according to claim 1, characterized in that: The invention also includes a locking member, a side wall of the transmission rod (6) is provided with a connecting groove (16), the handwheel assembly (4) is provided with a first through hole (15), and the locking member connects the transmission rod (6) and the handwheel assembly (4) through the first through hole (15) and the connecting groove (16).

9. The manual vacuum flapper valve according to claim 8, characterized in that: The handwheel assembly (4) comprises an integrally formed cover member (9), a first sleeve (10) and a second sleeve (11), wherein the first sleeve (10) and the second sleeve (11) are cylindrical structures extending along the axial direction of the cover member (9), the first sleeve (10) is coaxially arranged outside the second sleeve (11), the height of the first sleeve (10) is smaller than the height of the second sleeve (11), the first through hole (15) is provided on the second sleeve (11), and the transmission rod (6) is at least partially located inside the second sleeve (11).

10. The manual vacuum flapper valve according to claim 9, characterized in that: A copper sleeve (13) is provided between the second sleeve (11) and the transmission rod (6), and a second through hole is provided on the copper sleeve (13). The central axis of the first through hole (15), the central axis of the second through hole, and the central axis of the connecting groove (16) are located in the same plane perpendicular to the axial direction.

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