A shaft end sealing device

Abstract

The utility model relates to the technical field of shaft seal, concretely to a shaft end sealing device, including frame, dynamic sealing subassembly and carousel, frame fixedly arranged on the box of external equipment, dynamic sealing subassembly slidingly arranged on the box of external equipment, dynamic sealing subassembly is located below frame and contacts with the lower part of frame, the carousel rotation sets up in the upper portion of frame, and the transmission assembly rotation is set up between dynamic sealing subassembly's part through frame and carousel, and transmission assembly is located between the upper portion of frame and carousel, and the fixed setting of limit component between dynamic sealing subassembly's part and carousel, and the shaft of external equipment passes through dynamic sealing subassembly, frame and carousel in proper order. The shaft end sealing device of the utility model, the pre-tightening force of four limit springs makes four sliding blocks slide inwards simultaneously, four arc sealing strips slide inwards simultaneously, and the sealing torus is constituted between four arc sealing strips, and four arc sealing strips are tightly attached on the shaft of external equipment to realize sealing.

Description

Technical Field

[0001] This utility model relates to the field of shaft sealing technology, specifically to a shaft end sealing device. Background Technology

[0002] High-speed rotating shafts in process equipment require sealing at their rotating parts, such as fan shafts and gearbox input / output shafts. Effective sealing prevents foreign objects from entering the machine body and ensures that lubricants or other liquids inside the machine do not leak.

[0003] There are many types of shaft end seals available, with various structural forms. For high-speed rotating shaft end seals, there are dynamic seals and static seals. Dynamic seals, such as mechanical seals, generally have a more complex design and are slightly more expensive. The dynamic and static rings require cooling, and they are generally used in liquid environments. They are typically installed vertically or horizontally on the shaft to ensure sufficient installation space. Static seals commonly include skeleton seals and sealing ring seals. Skeleton seals are generally used under normal temperature and pressure conditions with minimal shaft runout. They are inexpensive, simple in structure, and relatively easy to maintain and replace. Sealing ring seals are the most common type of seal. They are generally easy to install and do not have strict requirements on installation dimensions. However, they can only be used between two relatively stationary components. In specific environments such as high temperatures, or on shafts with a certain amount of runout, static seals are not ideal, resulting in some leakage and not guaranteeing absolute sealing.

[0004] For high-speed rotating shaft seals, static seals, namely skeleton seals and sealing ring seals, are commonly used. Skeleton seals are generally single-lip or multi-lip and are used in environments with small shaft runout. However, in specific environments, such as high temperature and humidity, or environments with large shaft runout, the material of the skeleton seal will corrode and age faster, leading to seal failure and significantly shortening its service life. This results in equipment malfunctions and more frequent maintenance and replacement. Sealing ring seals come in various materials and shapes, but when sealing a runouting shaft, the sealing ring remains stationary and lacks the runout to follow the shaft, failing to seal leaks promptly and resulting in unsatisfactory performance.

[0005] For sealing high-speed, high-velocity shafts operating in specific high-temperature environments, existing structures (i.e., skeleton seals and sealing ring seals) suffer from problems such as inadequate sealing and unstable sealing performance. Therefore, a shaft end sealing device is urgently needed to solve these problems. Utility Model Content

[0006] To address the technical problems of inadequate sealing and unstable sealing performance in existing designs for sealing high-speed rotating shafts in specific high-temperature environments, this invention provides a shaft end sealing device. For sealing high-speed rotating shafts in specific high-temperature environments, the preload applied by four limiting springs causes four sliders to slide inwards simultaneously. The four sliders remain attached to the shaft of the external device. Simultaneously, four arc-shaped sealing strips slide inwards, forming a sealing ring. The four arc-shaped sealing strips are tightly attached to the shaft of the external device, achieving a seal.

[0007] This utility model provides a shaft end sealing device, including a base, a dynamic sealing assembly, and a turntable. The base is fixedly mounted on the housing of an external device. The dynamic sealing assembly is slidably mounted on the housing of the external device and is located below the base and in contact with the lower part of the base. The turntable is rotatably mounted on the upper part of the base. A transmission assembly is rotatably mounted between the dynamic sealing assembly and the turntable, with a portion of the dynamic sealing assembly passing through the base. The transmission assembly is located between the upper part of the base and the turntable. A limit assembly is fixedly mounted between the portion of the dynamic sealing assembly and the turntable. The shaft of the external device passes through the dynamic sealing assembly, the base, and the turntable in sequence.

[0008] Furthermore, the dynamic sealing assembly includes four sliders and arc-shaped sealing strips. The four sliders are slidably disposed on the housing of the external device. The four sliders are located below the base and in contact with the lower part of the base. The four sliders are arranged in a ring around the shaft of the external device and slide along the radial direction of the shaft of the external device. The four arc-shaped sealing strips are respectively fixedly disposed on the inner side of the four sliders, and the four arc-shaped sealing strips form a sealing ring. The base is provided with a first central hole, and the turntable is provided with a second central hole. The shaft of the external device passes through the sealing ring, the first central hole, and the second central hole in sequence.

[0009] Furthermore, each slider has an embedded groove at its bottom, and a rotating ball is rotatably disposed in each embedded groove. The lower part of each rotating ball contacts the housing of the external device and can move on it. When the slider slides outward or inward on the housing of the external device, the rotating ball actually rotates in the embedded groove, and after rotating, the rotating ball moves on the housing of the external device.

[0010] Furthermore, each slider is L-shaped, and each slider has an arc-shaped groove on its inner side. Four arc-shaped sealing strips are respectively fixedly disposed in the four arc-shaped grooves, and each slider has arc-shaped mating grooves at both ends. The arc-shaped sealing strips are fixed to the inner side of the slider through the arc-shaped grooves.

[0011] Furthermore, the turntable is placed on the upper part of the base and rotates relative to the base. The first central hole and the second central hole are coaxially arranged. The transmission assembly includes four connecting rods, all of which are placed on the upper part of the base and rotate relative to the base. Each connecting rod is in an inclined state. A boss is fixedly provided on the outer wall of the turntable. One end of each of the four connecting rods is located below the boss and in contact with the boss. One end of each connecting rod is provided with a first through hole. Four fixed shafts are evenly fixedly provided on the boss. Each fixed shaft is located in the first through hole and can rotate.

[0012] Furthermore, the base is provided with four sets of clearance structures, arranged in a ring around the axis of the external device. Each clearance structure includes two first slotted holes and a second slotted hole located between the two first slotted holes. Each slider has two first pins fixedly mounted on its top and a second pin located between the two first pins. The two first pins are respectively located in the two first slotted holes and are movable. The top of the second pin passes through the second slotted hole and is movable within it. When the slider slides outward or inward on the housing of the external device, the first pins move outward or inward within the first slotted holes, and the second pins move outward or inward within the second slotted holes.

[0013] Furthermore, each of the connecting rods has a second through hole at the other end, the top of the second pin passes through the second slot and the second through hole, the second pin moves in the second slot and the connecting rod rotates relative to the second pin.

[0014] Furthermore, the limiting assembly includes four limiting springs, each of which is fixedly connected at both ends to the top of the second pin and the turntable, respectively.

[0015] Furthermore, each spring has a first connector and a second connector fixedly provided at both ends, and four hinge seats are evenly fixedly provided on the boss. Each first connector is fixedly connected to the hinge seat, each second connector is fixedly provided with a connecting post, and each second pin has a fixing hole at its top. Each connecting post is inserted into the fixing hole.

[0016] Furthermore, the base is evenly provided with a plurality of first bolt holes, and the housing of the external device is provided with a plurality of second bolt holes at positions corresponding to the first bolt holes. The fixing bolts pass through the first bolt holes and the second bolt holes and are fixedly connected to the fixing nuts. The base is fixed to the housing of the external device, thereby fixing the entire shaft end sealing device to the housing of the external device.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This utility model's shaft end sealing device is designed for sealing shafts that vibrate at high speeds in specific high-temperature environments. The preload applied by four limiting springs causes four sliders to slide inwards simultaneously, ensuring that the four sliders remain attached to the shaft of the external device. The four arc-shaped sealing strips slide inwards simultaneously, forming a sealing ring between them. The four arc-shaped sealing strips are tightly attached to the shaft of the external device to achieve a seal, preventing liquid leakage. The four limiting springs ensure both the effectiveness and stability of the seal. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a shaft end sealing device according to the present invention; Figure 2 A schematic diagram of the structure of the shaft end sealing device of this utility model installed on the housing of an external device; Figure 3 An exploded view of the shaft end sealing device of this utility model; Figure 4 This is a top view of the dynamic sealing assembly and the base of this utility model. Figure 5 This is a bottom view of the dynamic sealing assembly and the base of this utility model. Figure 6 This is a schematic diagram of the slider of this utility model; Figure 7 This is a schematic diagram of the connecting rod of this utility model; Figure 8 This is a schematic diagram of the structure of the turntable of this utility model; The numbers in the attached diagram are: 1. Base; 11. First center hole; 12. First strip hole; 13. Second strip hole; 14. Fixing bolt; 2. Turntable; 21. Second center hole; 22. Boss; 221. Fixing shaft; 222. Hinge seat; 3. Dynamic sealing assembly; 31. Slider; 311. Embedded groove; 312. Ball bearing; 313. Arc-shaped groove; 314. Arc-shaped mating groove; 32. First pin; 33. Second pin; 331. Fixing hole; 4. Connecting rod; 41. First through hole; 42. Second through hole; 5. Limiting spring; 51. First connector; 52. Second connector; 521. Connecting column; 6. Housing; 7. Shaft. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1-8A shaft end sealing device is shown, comprising a base 1, a dynamic sealing assembly 3, and a turntable 2. The base 1 is fixedly mounted on the housing 6 of an external device. The base 1 is circular, and the external device can be a fan, a speed reducer, etc. The dynamic sealing assembly 3 is slidably mounted on the housing 6 of the external device. The dynamic sealing assembly 3 is located below the base 1 and contacts the lower part of the base 1. The turntable 2 is rotatably mounted on the upper part of the base 1. A transmission assembly is rotatably mounted between the dynamic sealing assembly 3, the base 1, and the turntable 2. The transmission assembly is located between the upper part of the base 1 and the turntable 2. A limit assembly is fixedly mounted between the dynamic sealing assembly 3 and the turntable 2. The shaft 7 of the external device passes through the dynamic sealing assembly 3, the base 1, and the turntable 2 in sequence.

[0021] When turntable 2 rotates clockwise, the dynamic seal assembly 3 opens outward, moving away from the shaft 7 of the external equipment. When turntable 2 rotates counterclockwise, the dynamic seal assembly 3 retracts inward, closing and pressing against the shaft 7 of the external equipment.

[0022] In the operation of the shaft end sealing device, the base 1 is fixed to the housing 6 of the external equipment, thus securing the entire shaft end sealing device to the housing 6. When the shaft 7 of the external equipment rotates and vibrates, the vibration of the shaft 7 causes the turntable 2 to rotate clockwise on the base 1. The transmission component rotates accordingly, and the dynamic sealing component 3 slides on the housing 6 of the external equipment. The dynamic sealing component 3 should open outward, but due to the action of the limiting component, the limiting component always pulls the dynamic sealing component 3 inward, ensuring that even if the shaft 7 vibrates, the preload applied by the limiting component keeps the dynamic sealing component 3 inward, keeping it closed. The dynamic sealing component 3 will be tightly pressed against the shaft 7 of the external equipment, thus achieving a seal between the shaft 7 of the external equipment and the dynamic sealing component 3, preventing liquid leakage between them. The sealing effect is quite significant.

[0023] The shaft end sealing device of this embodiment can be used normally under normal temperature and pressure, and its performance is even more significant under extreme and harsh conditions (such as high temperature and corrosive gas environments, and environments with many particulate dust). It does not have stringent requirements on the runout of the shaft 7, and can seal shafts 7 that rotate at high speeds and have large runout. The shaft end sealing device achieves sealing of the high-speed rotating shaft 7. The shaft end sealing device of this embodiment has a simple structure; it is highly versatile and can be used on rotating shaft-type machines; it is easy to install, requiring only fixation on one side of the external equipment housing 6.

[0024] In this embodiment, the shaft end sealing device seals the shaft 7 that is vibrating at high speed in a specific high-temperature environment. The pre-tightening force applied by the limiting component causes the dynamic sealing component 3 to always contract inward, and the dynamic sealing component 3 is in a closed state. The dynamic sealing component 3 will stick tightly to the shaft 7 of the external equipment, ensuring that the dynamic sealing component 3 can always press the shaft 7 when the shaft 7 rotates, so that the liquid does not leak. The limiting component ensures both the effectiveness and stability of the seal.

[0025] In one possible implementation, the dynamic sealing assembly 3 includes four sliders 31 and arc-shaped sealing strips (not shown in the figure). The four sliders 31 are slidably mounted on the housing 6 of the external device. The four sliders 31 are located below the base 1 and in contact with the lower part of the base 1. The four sliders 31 are arranged in a ring around the shaft 7 of the external device. The four sliders 31 slide along the radial direction of the shaft 7 of the external device. The four arc-shaped sealing strips are respectively fixedly mounted on the inner side of the four sliders 31, forming a sealing ring between the four arc-shaped sealing strips. The base 1 is provided with a first central hole 11, and the turntable 2 is provided with a second central hole 21. The shaft 7 of the external device passes through the sealing ring, the first central hole 11, and the second central hole 21 in sequence. The base 1, the turntable 2, and the four sliders 31 are coaxially arranged. Along the radial direction of the shaft 7 of the external device, the four sliders 31 slide outward simultaneously on the housing 6 of the external device, and the four arc-shaped sealing strips slide outward simultaneously, with the four sliders 31 and the arc-shaped sealing strips in an open state. Conversely, the four sliders 31 slide inward simultaneously on the enclosure 6 of the external device, and the four arc-shaped sealing strips slide inward simultaneously. The four sliders 31 and the arc-shaped sealing strips are in a closed state, and the four arc-shaped sealing strips form a sealing ring (when the four arc-shaped sealing strips are closed, they form a complete circle).

[0026] When the shaft 7 of the external device bounces while rotating, the bounce of the shaft 7 will cause the turntable 2 to rotate clockwise on the base 1. The transmission component will rotate accordingly, and the four sliders 31 will slide on the housing 6 of the external device at the same time. The four sliders 31 should slide outward at the same time, but due to the action of the limiting component, the limiting component always pulls the four sliders 31 to slide inward at the same time. The four arc-shaped sealing strips slide inward at the same time, and the four arc-shaped sealing strips form a sealing ring. The four sliders 31 are always attached to the shaft 7 of the external device, and the four arc-shaped sealing strips are tightly attached to the shaft 7 of the external device to achieve a seal. The sealing effect is quite significant.

[0027] The arc-shaped sealing strip can be replaced without complete disassembly. When installing or replacing the arc-shaped sealing strip, simply rotate the turntable 2 to move the four sliders 31 away from the shaft 7 of the external equipment. The shaft end sealing device of this embodiment makes the maintenance or replacement of the arc-shaped sealing strip relatively easy. The shape and material of the arc-shaped sealing strip can be changed to meet the requirements of various working conditions. The shaft end sealing device of this embodiment only requires periodic replacement of the arc-shaped sealing strip, making it inexpensive, economical, and easy to maintain.

[0028] In one possible implementation, each slider 31 has an inner groove 311 at its bottom, and a rotating ball 312 is rotatably disposed in each inner groove 311. The lower part of each rotating ball 312 contacts the housing 6 of the external device and can move on it. When the slider 31 slides outward or inward on the housing 6 of the external device, the rotating ball 312 actually rotates in the inner groove 311, and after rotating, the rotating ball 312 moves on the housing 6 of the external device. When the slider 31 slides, friction also occurs between the slider 31 and the lower part of the base 1.

[0029] In one possible implementation, each slider 31 is L-shaped, and each slider 31 has an arc-shaped groove 313 on its inner side. Four arc-shaped sealing strips are respectively fixedly disposed in the four arc-shaped grooves 313, and each slider 31 has an arc-shaped mating groove 314 at both ends. The arc-shaped sealing strips are fixed to the inner side of the slider 31 through the arc-shaped grooves 313. When the four arc-shaped sealing strips slide inward simultaneously, forming a sealing ring, the arc-shaped mating grooves 314 of two adjacent sliders 31 come into contact with each other, forming an end contact between the arc-shaped mating grooves 314 of two adjacent sliders 31. This further prevents liquid leakage from this point.

[0030] In one possible implementation, the turntable 2 is placed on the upper part of the base 1 and rotates relative to the base 1. The first central hole 11 and the second central hole 21 are coaxially arranged. The transmission assembly includes four connecting rods 4, all of which are placed on the upper part of the base 1 and rotate relative to the base 1. Each connecting rod 4 is in an inclined state. A boss 22 is fixedly provided on the outer wall of the turntable 2. One end of each of the four connecting rods 4 is located below the boss 22 and in contact with the boss 22. The boss 22 limits the position of the connecting rods 4, and the connecting rods 4 can only rotate between the boss 22 and the upper part of the base 1. One end of each connecting rod 4 is provided with a first through hole 41. Four fixed shafts 221 are evenly fixed on the boss 22. The fixed shafts 221 are located at the lower part of the boss 22, and each fixed shaft 221 is located in the first through hole 41 and can rotate. After the turntable 2 rotates, the fixed shaft 221 rotates synchronously and its position changes. The connecting rod 4 rotates with the fixed shaft 221, and the fixed shaft 221 rotates in the first through hole 41. The inclination of the connecting rod 4 changes with the rotation of the turntable 2. When the connecting rod 4 rotates, friction also occurs between the connecting rod 4 and the boss 22, as well as between the connecting rod 4 and the upper part of the base 1.

[0031] In one possible implementation, the base 1 is provided with four sets of clearance structures, which are arranged in a ring around the shaft 7 of the external device. Each clearance structure includes two first strip holes 12 and a second strip hole 13 located between the two first strip holes 12. The top of each slider 31 is fixedly provided with two first pins 32 and a second pin 33 located between the two first pins 32. The two first pins 32 are respectively located in the two first strip holes 12 and are movable. The top of the second pin 33 passes through the second strip hole 13 and is movable within it. The two first strip holes 12 limit the movement of the two first pins 32, and the second strip hole 13 limits the movement of the second pin 33, thereby restricting the sliding range of the slider 31. When the slider 31 slides outward or inward on the housing 6 of the external device, the first pin 32 moves outward or inward in the first strip hole 12, and the second strip hole 13 moves outward or inward in the second strip hole 13.

[0032] In one possible implementation, each connecting rod 4 has a second through hole 42 at its other end. The top of the second pin 33 passes through the second slotted hole 13 and the second through hole 42. The second pin 33 moves in the second slotted hole 13, and the connecting rod 4 rotates relative to the second pin 33. After the turntable 2 rotates, the fixed shaft 221 rotates synchronously and its position changes. The connecting rod 4 follows the rotation of the fixed shaft 221, and at the same time, the fixed shaft 221 rotates in the first through hole 41. Simultaneously, the connecting rod 4 rotates relative to the second pin 33 (when the connecting rod 4 rotates, the second through hole 42 actually rotates), and the second pin 33 moves in the second slotted hole 13.

[0033] In one possible implementation, the limiting assembly includes four limiting springs 5, each with its two ends fixedly connected to the top of the second pin 33 and the turntable 2, respectively. The limiting springs 5 ​​are always in a contracted state, ensuring that the slider 31 remains attached to the shaft 7 of the external device, while the arc-shaped sealing strip remains firmly attached to the shaft 7, achieving self-locking. Due to the preload of the limiting springs 5, the slider 31 remains in a relatively optimal sealing state even when the shaft 7 of the external device moves radially. Adding the limiting springs 5 ​​ensures both the effectiveness of the seal and stability.

[0034] The movement of the shaft 7 of the external device causes the turntable 2 to rotate clockwise on the base 1. After the turntable 2 rotates, the four fixed shafts 221 rotate synchronously and their positions change. The connecting rod 4 follows the rotation of the fixed shaft 221, and the fixed shaft 221 rotates in the first through hole 41. At the same time, the connecting rod 4 rotates relative to the second pin 33. The second pin 33 should have moved outward in the second slot 13, but due to the action of the limiting spring 5, the limiting spring 5 always pulls the second pin 33 inward in the second slot 13. At the same time, the first pin 32 moves inward in the first slot 12, and the slider 31 slides inward. The four sliders 31 slide inward at the same time. The four sliders 31 are always attached to the shaft 7 of the external device. The four arc-shaped sealing strips slide inward at the same time. The four arc-shaped sealing strips form a sealing ring. The four arc-shaped sealing strips are tightly attached to the shaft 7 of the external device to achieve a seal.

[0035] In one possible implementation, each spring has a first connector 51 and a second connector 52 fixedly disposed at both ends. Four U-shaped hinge seats 222 are uniformly fixedly disposed on the boss 22, located on the upper part of the boss 22. Each first connector 51 is fixedly connected to a hinge seat 222, and each second connector 52 has a connecting post 521 fixedly disposed on it. Each second pin 33 has a fixing hole 331 at its top, and each connecting post 521 is inserted into the fixing hole 331. Both the first connector 51 and the hinge seat 222 have pin holes, and the first connector 51 and the hinge seat 222 are fixedly connected through the pin holes and pins. With the connecting post 521 inserted into the fixing hole 331, the second connector 52 is fixed to the top of the second pin 33, and finally, both ends of the spring are fixed to the top of the second pin 33 and the turntable 2.

[0036] In one possible implementation, the base 1 is provided with a plurality of first bolt holes evenly distributed, and the housing 6 of the external device is provided with a plurality of second bolt holes at positions corresponding to the first bolt holes. The fixing bolts 14 pass through the first and second bolt holes and are fixedly connected to the fixing nuts. There are four first bolt holes, four second bolt holes, four fixing bolts 14, and four fixing nuts. The base 1 is fixed to the housing 6 of the external device, thus fixing the entire shaft end sealing device to the housing 6 of the external device.

[0037] In the operation of the shaft end sealing device, when the shaft 7 of the external equipment rotates and vibrates, the vibration of the shaft 7 causes the turntable 2 to rotate clockwise on the base 1. The four fixed shafts 221 rotate synchronously and their positions change. The four connecting rods 4 follow the rotation of the fixed shafts 221 and rotate in the first through hole 41. At the same time, the connecting rods 4 rotate relative to the second pin 33, and the second pin 33 moves in the second slotted hole 13. The first pin 32 moves in the first slotted hole 12. The limiting spring 5 acts, always pulling the second pin 33 inward in the second slotted hole 13, while simultaneously causing the first pin 32 to move inward in the first slotted hole 12 and the slider 31 to slide inward. The four sliders 31 slide inward simultaneously and are always attached to the shaft 7 of the external equipment. The four arc-shaped sealing strips slide inward simultaneously, forming a sealing ring between them. The four arc-shaped sealing strips are tightly attached to the shaft 7 of the external equipment to achieve a seal.

[0038] The embodiments described above are merely preferred embodiments of this utility model and are only used to explain this utility model. They are not intended to limit the scope of implementation of this utility model. For those skilled in the art, other implementation methods can be easily made by substitution or modification based on the technical content disclosed in this specification. Therefore, all changes and improvements made to the principles and process conditions of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A shaft end sealing device, characterized in that, The device includes a base (1), a dynamic sealing assembly (3), and a turntable (2). The base (1) is fixedly mounted on the housing (6) of the external device. The dynamic sealing assembly (3) is slidably mounted on the housing (6) of the external device. The dynamic sealing assembly (3) is located below the base (1) and contacts the lower part of the base (1). The turntable (2) is rotatably mounted on the upper part of the base (1). A portion of the dynamic sealing assembly (3) passes through the base (1) and a transmission assembly is rotatably mounted between the dynamic sealing assembly (3) and the turntable (2). The transmission assembly is located between the upper part of the base (1) and the turntable (2). A limit assembly is fixedly mounted between the portion of the dynamic sealing assembly (3) and the turntable (2). The shaft (7) of the external device passes through the dynamic sealing assembly (3), the base (1), and the turntable (2) in sequence.

2. The shaft end sealing device according to claim 1, characterized in that, The dynamic sealing assembly (3) includes four sliders (31) and arc-shaped sealing strips. The four sliders (31) are slidably mounted on the housing (6) of the external device. The four sliders (31) are located below the base (1) and in contact with the lower part of the base (1). The four sliders (31) are arranged in a ring around the shaft (7) of the external device. The four sliders (31) slide along the radial direction of the shaft (7) of the external device. The four arc-shaped sealing strips are respectively fixedly mounted on the inner side of the four sliders (31). The four arc-shaped sealing strips form a sealing ring. The base (1) is provided with a first central hole (11), and the turntable (2) is provided with a second central hole (21). The shaft (7) of the external device passes through the sealing ring, the first central hole (11), and the second central hole (21) in sequence.

3. The shaft end sealing device according to claim 2, characterized in that, Each slider (31) has an embedded groove (311) at its bottom, and each embedded groove (311) has a rotating ball (312) rotatably disposed therein. The lower part of each rotating ball (312) contacts the housing (6) of the external device and can move on it.

4. The shaft end sealing device according to claim 2, characterized in that, Each slider (31) is L-shaped, and each slider (31) has an arc-shaped groove (313) on its inner side. The four arc-shaped sealing strips are fixedly installed in the four arc-shaped grooves (313), and each slider (31) has an arc-shaped mating groove (314) at both ends.

5. The shaft end sealing device according to claim 2, characterized in that, The turntable (2) is placed on the upper part of the base (1) and rotates relative to the base (1). The first central hole (11) and the second central hole (21) are coaxially arranged. The transmission assembly includes four connecting rods (4). All four connecting rods (4) are placed on the upper part of the base (1) and rotate relative to the base (1). Each connecting rod (4) is in an inclined state. A boss (22) is fixedly provided on the outer wall of the turntable (2). One end of each of the four connecting rods (4) is located below the boss (22) and contacts the boss (22). One end of each connecting rod (4) is provided with a first through hole (41). Four fixed shafts (221) are evenly fixed on the boss (22). Each fixed shaft (221) is located in the first through hole (41) and can rotate.

6. The shaft end sealing device according to claim 5, characterized in that, The base (1) is provided with four sets of clearance structures. The four sets of clearance structures are arranged in a ring around the shaft (7) of the external equipment. Each clearance structure includes two first strip holes (12) and a second strip hole (13) located between the two first strip holes (12). The top of each slider (31) is fixedly provided with two first pins (32) and a second pin (33) located between the two first pins (32). The two first pins (32) are respectively located in the two first strip holes (12) and can move. The top of the second pin (33) passes through the second strip hole (13) and can move in the second strip hole (13).

7. The shaft end sealing device according to claim 6, characterized in that, Each of the connecting rods (4) has a second through hole (42) at the other end, the top of the second pin (33) passes through the second strip hole (13) and the second through hole (42), the second pin (33) moves in the second strip hole (13) and the connecting rod (4) rotates relative to the second pin (33).

8. The shaft end sealing device according to claim 7, characterized in that, The limiting assembly includes four limiting springs (5), each of which is fixedly connected at both ends to the top of the second pin (33) and the turntable (2).

9. The shaft end sealing device according to claim 8, characterized in that, Each spring has a first connector (51) and a second connector (52) fixedly installed at both ends. Four hinge seats (222) are evenly fixedly installed on the boss (22). Each first connector (51) is fixedly connected to the hinge seat (222). Each second connector (52) has a connecting post (521) fixedly installed on it. Each second pin (33) has a fixing hole (331) at its top. Each connecting post (521) is inserted into the fixing hole (331).

10. The shaft end sealing device according to claim 1, characterized in that, The base (1) is provided with a plurality of first bolt holes evenly distributed. The housing (6) of the external equipment is provided with a plurality of second bolt holes at positions corresponding to the first bolt holes. The fixing bolt (14) passes through the first bolt holes and the second bolt holes and is fixedly connected to the fixing nut.

Images