Sealing structure and gate valve

Abstract

The utility model provides a sealing structure and a gate valve. The sealing structure comprises a telescopic connecting assembly, a movable part and a sleeve part. The sleeve piece is provided with a through hole, and the sleeve piece is slidably arranged on the movable piece in a sleeving mode through the through hole; the telescopic connecting assembly comprises a telescopic sleeve, a first connecting piece and a second connecting piece. The telescopic sleeve is arranged on the first connecting piece in a sleeving mode through the first end of the telescopic sleeve, and the second end of the telescopic sleeve is connected with the second connecting piece. The second connecting piece is also hermetically connected with the sleeve piece; the first connecting piece is provided with a first connecting flange, and the first connecting flange is connected with the first end of the telescopic sleeve in a sealed mode. The first connecting piece is provided with a first connecting end located on the side, away from the first end of the sleeve, of the first connecting flange, and the first connecting end is used for being connected with an external movable piece. According to the sealing structure, an assembly similar to a piston is sealed in a static sealing mode, the problem of abrasion of a sealing piece in dynamic sealing commonly used at present can be solved, and therefore the sealing effect is improved.

Description

Technical Field

[0001] This application relates to the field of sealing technology, and more specifically, to a sealing structure and a gate valve. Background Technology

[0002] Sealing structures are typically used to prevent the leakage of fluids (gases or liquids, etc.). In piston-like components, there is usually a moving part and a sleeve. The moving part is equivalent to a piston rod, and the sleeve is equivalent to a piston sleeve. The moving part can move within the sleeve. However, there is a gap between the moving part and the sleeve. In some applications, this gap needs to be sealed.

[0003] Currently, sealing the contact points of piston-like components typically involves using sealing rings or similar sealing elements fitted onto the moving parts. These rings fill the gaps between the moving parts and the assembly, thus achieving a seal. This sealing method is also known as dynamic sealing.

[0004] However, because the moving parts frequently undergo piston-like movements within the assembly, the seals are subjected to friction caused by these movements. This can easily lead to wear on the seals, ultimately affecting their sealing performance. In other words, the sealing methods currently used for piston-like components are not yet sufficiently effective. Utility Model Content

[0005] The purpose of this application is to provide a sealing structure and a slide gate valve that uses a static sealing method to seal a piston-like component, thereby solving the problem of seal wear in commonly used dynamic seals and improving the sealing effect.

[0006] In a first aspect, this application provides a sealing structure, including a retractable connecting assembly, a movable member, and a kit; the kit has a through hole, through which the kit is slidably fitted onto the movable member; the retractable connecting assembly includes a retractable sleeve, a first connector, and a second connector; the retractable sleeve is fitted onto the first connector at its first end, and the second end of the retractable sleeve is connected to the second connector; the second connector is also sealingly connected to the kit; the first connector is provided with a first connecting flange, which is sealingly connected to the first end of the retractable sleeve; the first connector has a first connecting end located on the side of the first connecting flange away from the first end of the sleeve, and the first connecting end is used to connect to an external movable member.

[0007] The aforementioned sealing structure, through the sealing connection between the second connector and the kit, and the sealing connection between the first connecting flange and the telescopic sleeve, cuts off the airflow passage between the two ends of the kit's through hole. Furthermore, the seals between the second connector and the kit, and between the first connecting flange and the telescopic sleeve, are both static seals. When the moving part moves within the kit, it causes the first connector to move as well, which in turn causes the first end of the telescopic sleeve to move, resulting in the telescopic sleeve being stretched or compressed. This structural design avoids restricting the movement of the moving part within the kit. Therefore, the sealing structure provided in this application solves the wear problem of the sealing element in commonly used dynamic seals, thereby improving the sealing effect.

[0008] In conjunction with the first aspect, the structure may optionally further include a sealing ring; the sealing ring is located at the connection between the second connector and the kit; the second connector is sealed to the kit via the sealing ring.

[0009] The above-mentioned sealing structure, by setting a sealing ring at the connection between the second connector and the kit, not only achieves sealing at the connection between the second connector and the kit, but also simplifies the structure and process.

[0010] In conjunction with the first aspect, optionally, the end of the kit near the second end of the retractable sleeve has a second connecting flange; the second connecting flange is provided with a sealing groove for accommodating the sealing ring; the end of the second connector away from the second end of the retractable sleeve has a third connecting flange; the third connecting flange is fitted to the side of the second connecting flange where the sealing groove is provided, so as to achieve a seal between the second connector and the kit.

[0011] The aforementioned sealing structure, by providing a second connecting flange and a third connecting flange on the kit and the second connecting member respectively, increases the connection area between the second connecting member and the kit, thereby improving the stability of the connection between the kit and the second connecting member. Furthermore, the increased connection area between the second connecting member and the kit also further improves the sealing performance of the connection.

[0012] In conjunction with the first aspect, optionally, the retractable sleeve includes a corrugated pipe.

[0013] The aforementioned sealing structure uses a corrugated pipe as a expandable sleeve. Compared to sleeves made of elastic materials, the expandability of the corrugated pipe is achieved through its own corrugated structure, without relying excessively on the expandability of the material. Therefore, a higher-strength material can be used to make the corrugated pipe. This not only improves the quality of the expandable pipe but also further enhances the sealing performance of the sealing structure.

[0014] Secondly, this application provides a slide gate valve, including a valve seat, a valve plate, a first linear drive, a transmission assembly, and a first sealing structure; wherein the first sealing structure is defined according to the sealing structure described in the first aspect; the valve seat has a valve port, and the valve plate is movably disposed on the valve seat; a first connecting member of the first sealing structure has a second connecting end located on the side of the first connecting flange away from the first end of the sleeve; a first output shaft of the first linear drive is connected to the second connecting end of the first connecting member; a power input end of the transmission assembly is connected to the first connecting end of the first connecting member, and a power output end of the transmission assembly is connected to the valve plate; the transmission assembly is configured to drive the valve plate closer to or away from the valve port under the drive of the first linear drive, so as to realize the closing or opening of the valve port.

[0015] The aforementioned slide gate valve has the same beneficial effects as the sealing structure described in the first aspect, which will not be repeated here.

[0016] In conjunction with the second aspect, optionally, the transmission assembly includes a gear and a rack; the gear meshes with the rack; the rack is connected to a first connecting end of a first connecting member of the first sealing structure; the gear is connected to the valve plate so that, when the gear rotates, it drives the valve plate to swing within the plane of the valve plate.

[0017] The aforementioned slide gate valve, by employing a combination of gears and racks as the transmission component, converts the linear power output by the first linear drive component into torque, thereby driving the valve plate to oscillate. This oscillating motion, used to open and close the valve port, shortens the valve plate's stroke and reduces the space occupied by the valve plate in both open and closed states compared to translational movements.

[0018] In conjunction with the second aspect, optionally, the transmission assembly further includes a pin; the rack is provided with a first connecting hole; the first connecting end of the first connecting member of the first sealing structure is provided with a second connecting hole; the pin is inserted into the first connecting hole and the second connecting hole to realize the connection between the rack and the first connecting member.

[0019] The aforementioned slide gate valve has a certain gap between the telescopic sleeve and the first connecting member. The rack and the first connecting member are connected by a pin to achieve a movable connection between them. This allows the rack to swing at a certain angle during its movement driven by the first connecting member, thus achieving a certain displacement compensation effect.

[0020] In conjunction with the second aspect, optionally, the rack includes a toothed portion and a connecting portion; the toothed portion is provided with teeth; the connecting portion is the part of the rack without teeth, and is connected to the first connecting member; the cross-section of the connecting portion is a geometric shape other than a circle; the through hole has a limiting end, the cross-sectional shape of the limiting end matches the cross-section of the connecting portion; wherein, the limiting end includes one end close to the second end of the kit.

[0021] The aforementioned slide gate valve, by designing the rack's connecting part as a non-cylindrical column and ensuring the cross-sectional shape of the limiting section matches the connecting part's cross-sectional shape and size, restricts the rack's rotation within the limiting section. This effectively prevents the rack from rotating, thus improving the slide gate valve's stability during operation.

[0022] Optionally, in conjunction with the second aspect, the system further includes a second linear drive and a second sealing structure; wherein the second sealing structure is determined according to the sealing structure described in the first aspect; the movable component of the second sealing structure includes a drive shaft and the gear; a first drive end of the drive shaft is connected to the valve plate, and a second drive end of the drive shaft is connected to the rotation center of the gear; a second connection end of the first connector of the second sealing structure is connected to the second output shaft of the second linear drive; the second linear drive is configured to drive the valve plate to perform linear motion, so as to make the valve plate adhere to or disengage from the valve seat.

[0023] The aforementioned slide gate valve is prone to gas leakage because the valve body cavity can be connected to the outside through the gap between the sleeve (i.e., the kit) and the gear mounted on the drive shaft. However, by adapting another sealing structure to the transmission structure that drives the valve plate to press against or detach from the valve seat, the gas path connecting the valve body cavity to the outside is cut off, thereby further improving the airtightness of the slide gate valve.

[0024] In conjunction with the second aspect, optionally, the movable component of the second sealing structure further includes a transmission key; the gear is provided with a mounting hole through which the transmission shaft passes; the inner wall of the mounting hole is provided with a first recess for accommodating a first portion of the transmission key; the transmission shaft is provided with a second recess for accommodating a second portion of the transmission key; the gear is sleeved on the transmission shaft, and the transmission key is jointly accommodated by the first recess and the second recess.

[0025] The aforementioned slide gate valve, by incorporating a key between the gear and the drive shaft, allows the drive shaft to rotate synchronously when the gear rotates. This prevents slippage of the gear on the drive shaft, thus improving the transmission efficiency between the gear and the drive shaft. Furthermore, the key allows for a detachable connection between the gear and the drive shaft.

[0026] In summary, the sealing structure and slide gate valve provided in this application, through the sealing connection between the second connector and the kit, and the sealing connection between the first connecting flange and the retractable sleeve, cut off the airflow passage between the two ends of the kit's through hole. It also avoids restricting the movement of moving parts within the kit by the sealing structure. Ultimately, it solves the wear problem of the sealing element in commonly used dynamic seals, thereby improving the sealing effect. By setting a sealing ring at the connection between the second connector and the kit, it not only achieves sealing at the connection between the second connector and the kit, but also simplifies the structure and process. By setting a second connecting flange and a third connecting flange on the kit and the second connector respectively, the area at the connection between the second connector and the kit is increased, thereby improving the stability of the connection between the kit and the second connector. It also further improves the sealing performance at the connection. By applying the sealing structure provided in this application to a slide gate valve, the airtightness of the slide gate valve is further improved. By using a combination of gears and racks as the transmission component, the linear power output by the first linear drive is converted into torque to drive the valve plate to swing, shortening the valve plate's stroke and reducing the space occupied by the valve plate in the open and closed states. By adapting another sealing structure to the transmission structure that drives the valve plate to press against or detach from the valve seat, the air passage connecting the valve body cavity to the outside of the valve body cavity is cut off, thereby further improving the airtightness of the slide gate valve. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A cross-sectional view of the sealing structure provided in an embodiment of this application;

[0029] Figure 2 This is a first cross-sectional view of the retractable connection component in the sealing structure provided in the embodiments of this application;

[0030] Figure 3 This is a second cross-sectional view of the retractable connection component in the sealing structure provided in the embodiments of this application;

[0031] Figure 4 A perspective view of the slide gate valve provided in an embodiment of this application;

[0032] Figure 5 A partial cross-sectional view of the slide gate valve provided in the embodiments of this application regarding the first sealing structure;

[0033] Figure 6 This is a cross-sectional view of the slide gate valve provided in an embodiment of this application.

[0034] Icons: 100, Sealing structure; 110, Telescopic connection assembly; 111, Telescopic sleeve; 1111, First end; 1112, Second end; 112, First connector; 1121, First connecting flange; 1122, First connecting end; 1123, Second connecting end; 113, Second connector; 1131, Third connecting flange; 120, Moving part; 130, Kit; 131, Second connecting flange; 132, Limiting end; 140, Sealing ring; 10, Slide valve; 200, Valve seat; 300, Valve plate; 400, First linear drive; 410, First output shaft; 500, Transmission assembly; 510, Gear; 520, Rack; 521, Rack tooth section; 522, Connecting part; 523, Transmission shaft; 524, Transmission key; 600, Second linear drive; 610, Second output shaft connection. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] Please refer to Figures 1 to 3 , Figure 1 This is a cross-sectional view of the sealing structure 100 provided in the embodiments of this application; Figure 2 This is a first cross-sectional view of the retractable connection component 110 in the sealing structure 100 provided in this application embodiment; Figure 3This is a second cross-sectional view of the retractable connecting assembly 110 in the sealing structure 100 provided in this application embodiment. The sealing structure 100 provided in this application embodiment may include the retractable connecting assembly 110, a movable member 120, and a sleeve 130. The sleeve 130 may have a through hole, and the sleeve 130 may be slidably fitted onto the movable member 120 through the through hole. The retractable connecting assembly 110 may include a retractable sleeve 111, a first connecting member 112, and a second connecting member 113. The retractable sleeve 111 may be fitted onto the first connecting member 112 through its first end 1111, and the second end 1112 of the retractable sleeve 111 may be connected to the second connecting member 113. The second connecting member 113 may also be sealingly connected to the sleeve 130. The first connecting member 112 may be provided with a first connecting flange 1121, and the first connecting flange 1121 may be sealingly connected to the first end 1111 of the retractable sleeve 111. The first connector 112 may have a first connecting end 1122 located on the side of the first connecting flange 1121 away from the first end 1111 of the sleeve, and the first connecting end 1122 may be used to connect to an external moving part 120.

[0042] The movable component 120 can be a piston rod, push rod, etc. The sleeve 130 can be a sleeve, piston rod guide sleeve, etc. The sleeve 130 is fitted onto the movable component 120, allowing the movable component 120 to move linearly within the through hole of the sleeve 130. The telescopic sleeve 111 can be a bellows or a sleeve made of elastic material. The external movable component 120 can be the first output shaft 410 of the drive component or the transmission end of the transmission assembly 500, etc.

[0043] The telescopic sleeve 111 is connected to the first connecting member 112, but the telescopic sleeve 111 may not be penetrated by the first connecting member 112; the first connecting member 112 may be partially located within the telescopic sleeve 111. The sealing connection between the second connecting member 113 and the kit 130 can be welding, or it can be achieved by filling the connection with sealant or installing a sealant. The sealing connection between the first connecting flange 1121 and the telescopic sleeve 111 can be heat fusion, or it can be achieved by filling the connection with sealant.

[0044] In the above implementation process, the airflow passage between the two ends of the through hole of the kit 130 is cut off through the sealing connection between the second connecting member 113 and the kit 130, and the sealing connection between the first connecting flange 1121 and the telescopic sleeve 111. Furthermore, the seals between the second connecting member 113 and the kit 130, and between the first connecting flange 1121 and the telescopic sleeve 111, are both static seals. When the movable member 120 moves within the kit 130, it drives the first connecting member 112 to move as well, which in turn drives the first end 1111 of the telescopic sleeve 111 to move as well, causing the telescopic sleeve 111 to be stretched or compressed. This structural design avoids the sealing structure 100 restricting the movement of the movable member 120 within the kit 130. Therefore, the sealing structure 100 provided in this embodiment solves the problem of seal wear in commonly used dynamic seals, thereby improving the sealing effect.

[0045] Please continue to refer to Figure 1 In some optional embodiments, the sealing structure 100 provided in this application may further include a sealing ring 140. The sealing ring 140 may be located at the connection between the second connector 113 and the kit 130. The second connector 113 may be sealed to the kit 130 via the sealing ring 140.

[0046] The sealing ring 140 can be a metal sealing ring 140. The connection between the second connector 113 and the kit 130 can be located at one end of the kit 130 near the second end 1112 of the telescopic sleeve 111, or it can be located in the middle of the kit 130.

[0047] In the above implementation process, by setting a sealing ring 140 at the connection between the second connector 113 and the kit 130, the connection between the second connector 113 and the kit 130 is sealed, and the structure and process are also simplified.

[0048] Please continue to refer to Figure 1 and Figure 2 In some alternative embodiments, the end of the kit 130 near the second end 1112 of the retractable sleeve 111 may have a second connecting flange 131. The second connecting flange 131 may be provided with a sealing groove for accommodating the sealing ring 140. The end of the second connector 113 away from the second end 1112 of the retractable sleeve 111 may have a third connecting flange 1131. The third connecting flange 1131 may fit against the side of the second connecting flange 131 where the sealing groove is provided to achieve a seal between the second connector 113 and the kit 130.

[0049] Because kit 130 has a through hole, its structure is equivalent to a sleeve. The second connecting flange 131 on kit 130 may extend outward from or into the through hole.

[0050] In the above implementation process, by providing a second connecting flange 131 and a third connecting flange 1131 on the kit 130 and the second connecting member 113 respectively, the area of ​​the connection between the second connecting member 113 and the kit 130 is increased, thereby improving the stability of the connection between the kit 130 and the second connecting member 113. In addition, since the area of ​​the connection between the second connecting member 113 and the kit 130 is increased, the sealing performance of the connection between them is also further improved.

[0051] Please continue to refer to Figure 2 and Figure 3 In some alternative implementations, the retractable sleeve 111 may include a bellows.

[0052] In the above implementation process, a corrugated pipe is used as the expandable sleeve 111. Compared with a sleeve made of elastic material, the expandability of the corrugated pipe is achieved by its own corrugated structure, without relying excessively on the expandability of the material. Therefore, a higher strength material can be used to make the corrugated pipe. This not only improves the quality of the expandable pipe, but also further improves the sealing performance of the sealing structure 100.

[0053] Please combine Figure 2 Reference Figure 4 and Figure 5 , Figure 4 This is a perspective view of the slide gate valve 10 provided in the embodiments of this application; Figure 5 This is a partial cross-sectional view of the slide gate valve 10 provided in this application embodiment regarding the first sealing structure. Based on the same concept, this application embodiment provides a slide gate valve 10, which may include a valve seat 200, a valve plate 300, a first linear drive member 400, a transmission assembly 500, and a first sealing structure. The first sealing structure can be determined according to the sealing structure 100 described above. The valve seat 200 may have a valve port, and the valve plate 300 may be movably disposed on the valve seat 200. The first connecting member 112 of the first sealing structure may have a second connecting end 1123 located on the side of the first connecting flange 1121 away from the first end 1111 of the sleeve. The first output shaft 410 of the first linear drive member 400 may be connected to the second connecting end 1123 of the first connecting member 112. The power input end of the transmission assembly 500 may be connected to the first connecting end 1122 of the first connecting member 112, and the power output end of the transmission assembly 500 may be connected to the valve plate 300. The transmission assembly 500 can be configured to drive the valve plate 300 closer to or further away from the valve port under the drive of the first linear drive member 400, so as to close or open the valve port.

[0054] The retractable connecting component 110 in the first sealing structure can be as follows: Figure 2 The structure is shown. The first linear drive 400 can be a cylinder. The transmission assembly 500 can transmit the power output by the first linear drive 400 to the valve plate 300. The transmission assembly 500 can also change the form of power, for example, converting the power output by the first linear drive 400 for driving the target in a linear motion into torque. When the transmission assembly 500 can change the form of power, taking a transmission assembly 500 consisting of a gear 510 and a rack 520 as an example, the valve plate 300 receives torque. Then the valve plate 300 can swing along its own plane to close or open the valve port. For example, if both the valve port and the valve plate 300 are circular, the valve plate 300 can be connected to the valve seat 200 via a connecting pin perpendicular to its own plane. The pin hole on the valve plate 300 for connecting the pin can be eccentrically positioned or located at the edge of the valve plate 300. Thus, the valve plate 300 can swing under the action of the received torque.

[0055] In the above implementation process, by applying the sealing structure 100 provided above in this application to the slide gate valve 10, since the slide gate valve 10 itself usually has certain requirements for airtightness, the airtightness of the slide gate valve 10 is further improved by applying the sealing structure 100 provided in this application to the transmission structure used to drive the valve plate 300 to open or close. Other implementation processes and beneficial effects of the slide gate valve 10 provided in the embodiments of this application can be the same as those of the sealing structure 100 described above, and will not be repeated here.

[0056] Please continue to refer to Figure 5 In some alternative embodiments, the transmission assembly 500 may include a gear 510 and a rack 520. The gear 510 meshes with the rack 520. The rack 520 may be connected to a first connecting end 1122 of the first connecting member 112 of the first sealing structure. The gear 510 may be connected to the valve plate 300 so that, when the gear 510 rotates, it drives the valve plate 300 to oscillate within the plane of the valve plate 300.

[0057] In the above implementation process, by using a combination of gear 510 and rack 520 as the transmission component 500, the linear power output by the first linear drive 400 is converted into torque to drive the valve plate 300 to swing. Opening and closing the valve port by swinging shortens the stroke of the valve plate 300 compared to translational movements, and also reduces the space occupied by the valve plate 300 in the open and closed states.

[0058] Please continue to refer to Figure 5In some alternative embodiments, the transmission assembly 500 may further include a pin. The rack 520 may be provided with a first connecting hole. The first connecting end 1122 of the first sealing structure first connector 112 may be provided with a second connecting hole. The pin may be inserted into both the first and second connecting holes to achieve connection between the rack 520 and the first connector 112.

[0059] The length direction of the pin can be any direction perpendicular to the straight line of the rack 520.

[0060] In the above implementation process, since there is a certain gap between the telescopic sleeve 111 and the first connecting member 112, the rack 520 and the first connecting member 112 are connected by a pin to realize the movable connection between them. Thus, when the rack 520 moves under the drive of the first connecting member 112, it can swing at a certain angle through the movable connection, thereby playing a certain displacement compensation role.

[0061] Please continue to refer to Figure 5 In some alternative embodiments, the rack 520 may include a toothed portion 521 and a connecting portion 522. The toothed portion 521 may be provided with teeth. The connecting portion 522 may be a portion of the rack 520 without teeth and may be connected to the first connecting member 112. The cross-section of the connecting portion 522 may be a geometric shape other than circular. The through hole may have a limiting end 132, the cross-sectional shape of which may match the cross-section of the connecting portion 522. The limiting end 132 may include one end near the second end 1112 of the kit 130.

[0062] The cross-section of the connecting portion 522 of the rack 520 can be square, polygonal, or elliptical, etc. The cross-sectional shape of the limiting segment can be the same as the cross-sectional shape and size of the connecting portion 522.

[0063] In the above implementation process, by designing the connecting part 522 of the rack 520 into a non-cylindrical column shape, and designing the cross-sectional shape of the limiting section to be consistent with the cross-sectional shape and size of the connecting part 522, the rotation of the rack 520 in the limiting part is restricted. That is, the rack 520 is prevented from rotating, which in turn improves the stability of the slide valve 10 during operation.

[0064] Please combine Figure 3 , Figure 4 Reference Figure 6 , Figure 6This is a cross-sectional view of the slide gate valve 10 provided in an embodiment of this application. In some optional embodiments, the slide gate valve 10 provided in this application may further include a second linear drive member 600 and a second sealing structure. The second sealing structure can be determined based on the sealing structure 100 described above. The movable part 120 of the second sealing structure may include a drive shaft 523 and a gear 510. The first drive end of the drive shaft 523 may be connected to the valve plate 300, and the second drive end of the drive shaft 523 may be connected to the rotation center of the gear 510. The second connection end 1123 of the first connecting member 112 of the second sealing structure may be connected 610 to the second output shaft of the second linear drive member 600. The second linear drive member 600 may be configured to drive the valve plate 300 to perform linear motion, so as to make the valve plate 300 adhere to or disengage from the valve seat 200.

[0065] In other words, the slide gate valve 10 provided in this embodiment includes two sets of sealing structures 100 as described above. These two sets of sealing structures 100 are respectively disposed at different positions of the slide gate valve 10 and are adapted to different components. The retractable connecting assembly 110 in the second sealing structure can be as follows: Figure 3 The structure shown.

[0066] The second linear actuator 600 is used to drive the valve plate 300 to adhere to or disengage from the valve seat 200 via the sealing structure 100 and the drive shaft 523. That is, the valve plate 300 can perform translational movement under the action of the second linear actuator 600. The direction of translation can be perpendicular to its own plane. The second linear actuator 600 can also be a cylinder.

[0067] It is worth mentioning that, according to Figure 5 As shown, the rotation direction of gear 510 is around... Figure 5 The direction of rotation of the rotation axis shown is indicated. The kit 130 can be a sleeve fitted over the gear 510 and the drive shaft 523. In this embodiment, since the valve plate 300 involves two different forms of movement—oscillation and translation—during opening or closing, the movement of the gear 510 and the drive shaft 523 correspondingly includes rotation about the rotation axis and translation along the direction of the rotation axis. However, if the second output shaft of the second linear drive 600 is rigidly connected to the first connecting member 112 in the second sealing structure, then the second linear drive 600 will be driven to rotate, which is undoubtedly detrimental to the fixation of the second linear drive cylinder. Therefore, in order to prevent the torque of the gear 510 from being transmitted to the second linear drive cylinder, the second output shaft of the second linear drive 600 can be connected to the first connecting member 112 in the second sealing structure via a rotary bearing.

[0068] In the above implementation process, since the valve body cavity can be connected to the outside through the gap between the sleeve (i.e., the kit 130) and the gear 510 set on the transmission shaft 523, it is easy for gas in the valve body cavity to leak out of the valve body cavity. However, by adapting another sealing structure 100 to the transmission structure that drives the valve plate 300 to be tightly attached to or detached from the valve seat 200, the air passage connecting the valve body cavity to the outside of the valve body cavity is cut off, thereby further improving the airtightness of the slide gate valve 10.

[0069] Please continue to refer to Figure 5 In some optional embodiments, the movable component 120 of the second sealing structure may further include a transmission key 524. The gear 510 may have a mounting hole through which the drive shaft 523 passes. The inner wall of the mounting hole may have a first recess to accommodate a first portion of the transmission key 524. The drive shaft 523 may have a second recess to accommodate a second portion of the transmission key 524. The gear 510 may be sleeved on the drive shaft 523, and the transmission key 524 may be accommodated by both the first and second recesses. The transmission key 524 may be a guide key.

[0070] In the above implementation process, by setting a transmission key 524 between the gear 510 and the transmission shaft 523, the transmission shaft 523 is driven to rotate synchronously through the transmission key 524 when the gear 510 rotates. This prevents the gear 510 from slipping on the transmission shaft 523, thus improving the transmission efficiency between the gear 510 and the transmission shaft 523. Furthermore, by setting a transmission key 524 between the gear 510 and the transmission shaft 523, the connection between the gear 510 and the transmission shaft 523 can be detachable.

[0071] In summary, the sealing structure 100 and slide gate valve 10 provided in the various embodiments of this application, through the sealing connection between the second connecting member 113 and the kit 130, and the sealing connection between the first connecting flange 1121 and the telescopic sleeve 111, cut off the airflow passage between the two ends of the through hole of the kit 130. Simultaneously, it avoids the sealing structure 100 restricting the movement of the movable member 120 within the kit 130. Ultimately, it solves the problem of wear of the sealing element in commonly used dynamic seals, thereby improving the sealing effect. By setting a sealing ring 140 at the connection between the second connecting member 113 and the kit 130, the structure and process are simplified while achieving a seal at the connection between the second connecting member 113 and the kit 130. By setting a second connecting flange 131 and a third connecting flange 1131 on the kit 130 and the second connecting member 113 respectively, the area at the connection between the second connecting member 113 and the kit 130 is increased, thereby improving the stability of the connection between the kit 130 and the second connecting member 113. This further improves the sealing performance at the connection. By applying the sealing structure 100 provided in this application to the slide gate valve 10, the airtightness of the slide gate valve 10 is further improved. By using a combination of gear 510 and rack 520 as the transmission component 500, the linear power output by the first linear drive 400 is converted into torque to drive the valve plate 300 to swing, shortening the stroke of the valve plate 300 and reducing the space occupied by the valve plate 300 in the open and closed states. By adapting another sealing structure 100 to the transmission structure that drives the valve plate 300 to press against or detach from the valve seat 200, the air passage connecting the valve body cavity to the outside of the valve body cavity is cut off, thereby further improving the airtightness of the slide gate valve 10.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A seal structure, characterized by, The structure comprises a telescopic connecting assembly, a movable element and a sleeve; The sleeve has a through hole, and the sleeve is slidably sleeved on the movable element through the through hole; The telescopic connecting assembly comprises a telescopic sleeve, a first connecting element and a second connecting element; the telescopic sleeve is sleeved on the first connecting element through a first end thereof, and a second end of the telescopic sleeve is connected with the second connecting element; the second connecting element is also sealingly connected with the sleeve; The first connecting element is provided with a first connecting flange, and the first connecting flange is sealingly connected with the first end of the telescopic sleeve; The first connecting element has a first connecting end located on a side of the first connecting flange away from the first end of the sleeve, and the first connecting end is used for connecting with an external movable element.

2. The seal structure of claim 1, wherein The structure further comprises a sealing ring; The sealing ring is located at a connection between the second connecting element and the sleeve; The second connecting element is sealingly connected with the sleeve through the sealing ring.

3. The seal structure of claim 2, wherein An end of the sleeve close to the second end of the telescopic sleeve has a second connecting flange; The second connecting flange is provided with a sealing groove for accommodating the sealing ring; An end of the second connecting element away from the second end of the telescopic sleeve has a third connecting flange; The third connecting flange is arranged on a side of the second connecting flange opposite to the side provided with the sealing groove, so as to realize the sealing between the second connecting element and the sleeve.

4. The seal structure of claim 1, wherein Wherein, The telescopic sleeve comprises a bellows.

5. A plug valve characterized by, The structure comprises a valve seat, a valve plate, a first linear driving element, a transmission assembly and a first sealing structure; wherein the first sealing structure is determined according to any one of claims 1 to 4; The valve seat has a valve port, and the valve plate is movably arranged on the valve seat; The first connecting element of the first sealing structure has a second connecting end located on a side of the first connecting flange away from the first end of the sleeve; The first output shaft of the first linear driving element is connected with the second connecting end of the first connecting element; The power input end of the transmission assembly is connected with the first connecting end of the first connecting element, and the power output end of the transmission assembly is connected with the valve plate; The transmission assembly is configured to drive the valve plate to approach or move away from the valve port under the driving of the first linear driving element, so as to realize the closing or opening of the valve port.

6. The flapper valve of claim 5, wherein, The transmission assembly comprises a gear and a rack; The gear is engaged with the rack; The rack is connected with the first connecting end of the first connecting element of the first sealing structure; The gear is connected with the valve plate, so as to drive the valve plate to swing in a plane in which the valve plate is located under the rotation of the gear.

7. The flapper valve of claim 6, wherein, The transmission assembly further comprises a pin shaft; The rack is provided with a first connecting hole; The first connecting end of the first connecting element of the first sealing structure is provided with a second connecting hole; The pin shaft is inserted into the first connecting hole and the second connecting hole, so as to realize the connection between the rack and the first connecting element.

8. The flapper valve of claim 6, wherein, The rack comprises a rack tooth part and a connecting part; The rack tooth part is provided with a rack tooth. The connecting part is a part without a rack tooth on the rack and is connected with the first connecting piece; the cross section of the connecting part is other geometric shapes except a circle; The through hole has a limiting end, and the cross section shape of the limiting end matches the cross section of the connecting part; wherein the limiting end includes one end close to the second end of the sleeve.

9. The flapper valve of claim 6, wherein, Further comprising a second linear driving piece and a second sealing structure; wherein the second sealing structure is determined according to any one of claims 1 to 4; The movable piece of the second sealing structure includes a transmission shaft and the gear; The first transmission end of the transmission shaft is connected with the valve plate, and the second transmission end of the transmission shaft is connected with the rotation center of the gear; The second connecting end of the first connecting piece of the second sealing structure is connected with the second output shaft of the second linear driving piece; The second linear driving piece is configured to drive the valve plate to move linearly, so as to realize that the valve plate is close to or separated from the valve seat.

10. The flapper valve of claim 9, wherein, The movable piece of the second sealing structure further includes a transmission key; The gear is provided with a mounting hole for the transmission shaft to penetrate; The inner wall of the mounting hole is provided with a first recess for accommodating a first part of the transmission key; The transmission shaft is provided with a second recess for accommodating a second part of the transmission key; The gear is sleeved on the transmission shaft, and the transmission key is jointly accommodated by the first recess and the second recess.

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