Speed reducer with dynamically sealed shaft end

Abstract

The invention relates to the technical field of transmission, in particular to a shaft end dynamic sealing speed reducer which comprises a shell, a rotating shaft, a rotating part and two sealing assemblies. A spiral sealing groove is formed in the area, corresponding to the rotating piece, of the rotating shaft. The sealing assembly comprises a static plate, a movable plate and a base plate which are arranged on the rotating shaft in a sleeving mode. The movable plate is arranged between the static plate and the base plate; a plurality of spiral open grooves are formed in the end face, facing the static plate, of the movable plate at intervals. In the rotating process of the rotating shaft, the movable plate is configured to rotate under the driving of the rotating shaft, so that dynamic pressure is formed in the open groove, surrounding fluid is attracted to form a fluid film between the movable plate and the static plate, and the rotating piece is configured to rotate around the sphere center of the spherical curved surface under the pushing of the static plate, so that the coaxiality of the rotating piece and the rotating shaft is improved. According to the scheme, the fluid film is used for pushing the static plate, then the rotating piece is pushed to rotate in the deviation direction of the rotating shaft, the coaxiality of the rotating piece and the rotating shaft is improved, and the sealing effect is improved.

Description

Technical Field

[0001] The invention relates to the field of transmission technology, in particular to a reducer with a shaft end dynamic seal. Background Art

[0002] The reducer is an independent component consisting of a gear transmission, a worm transmission, or a gear-worm transmission enclosed in a rigid housing. It is often used as a reduction transmission device between the prime mover and the working machine. In order to extend the service life of the transmission structure and maintain a good working condition, the reducer generally adopts oil immersion lubrication, which can not only reduce the friction and wear of the transmission parts, but also effectively cool down the temperature, thereby improving the operating efficiency and reliability of the reducer.

[0003] The application of oil-immersion lubrication has put forward higher requirements on the sealing performance of the reducer. In the prior art, when the shaft of the reducer extends out of the housing, a spiral seal is usually used to prevent the leakage of lubricating oil. However, during the actual operation of the reducer, due to the influence of various dynamic factors, such as bearing clearance, load changes, etc., the shaft end of the shaft may be deflected relative to the mounting hole. This deflection phenomenon will cause eccentricity between the shaft end of the shaft and the sealing structure in the mounting hole, thereby causing uneven changes in the sealing gap. The originally designed tight sealing structure may fail due to excessive local gaps, which seriously affects the sealing effect of the reducer. Summary of the invention

[0004] The purpose of the present invention is to improve the sealing effect of the reducer.

[0005] In particular, the present invention provides a reducer with a dynamic seal on the shaft end, comprising: a housing, with symmetrical mounting holes formed on both sides thereof; a rotating shaft, arranged on the housing; one end of the rotating shaft is arranged in a mounting hole, and the other end passes through the symmetrical mounting hole and extends out of the housing; a rotating member, which is annular, sleeved on the end of the rotating shaft extending out of the housing, and is located in the corresponding mounting hole; an annular spherical surface is formed on the side wall surface of the rotating member; a spiral sealing groove is formed on the area of ​​the rotating shaft corresponding to the rotating member; two sealing assemblies are sleeved on the rotating shaft and are respectively located at the axial ends of the rotating member; each sealing assembly includes a static plate, a dynamic plate and a base plate sleeved on the rotating shaft The plate is a static plate that abuts against the rotating part; the dynamic plate is arranged between the static plate and the base plate; a plurality of spiral grooves are arranged at intervals on the end surface of the dynamic plate facing the static plate, and the end of the groove that is away from the axis of the dynamic plate passes through the side wall of the dynamic plate; a plurality of compression springs are arranged between the base plate and the dynamic plate; during the rotation of the rotating shaft, the dynamic plate is configured to rotate under the drive of the rotating shaft, so that dynamic pressure is formed in the groove, and the surrounding fluid is attracted to form a fluid film between the dynamic plate and the static plate, and the rotating part is configured to rotate around the center of the spherical surface under the push of the static plate, so that the coaxiality of the rotating part and the rotating shaft is improved; after the rotating shaft stops rotating, the dynamic plate is pressed against the static plate under the pressure of the plurality of compression springs.

[0006] Furthermore, the reducer with dynamic sealing at the shaft end also includes: a mounting seat, which is sleeved on the outer periphery of the rotating part, and an annular spherical groove adapted to the spherical surface of the rotating part is formed on the inner wall surface of the mounting seat; an annular mounting plate is respectively provided at both ends of the mounting seat, and a plurality of fastening holes are arranged at intervals on the mounting plate; an annular end cover is fixedly mounted on the shell and sleeved on the outer periphery of the mounting seat; the annular end cover includes an end plate installed on the side wall of the shell, and a mounting tube extending from the end plate into the mounting hole; an annular step surface adapted to the mounting plate is correspondingly arranged on the mounting tube; a plurality of fasteners are arranged correspondingly to the plurality of fastening holes; each fastener passes through the corresponding fastening hole and is connected to the annular step surface.

[0007] Furthermore, at least one sealing strip is provided between the mounting seat and the rotating member.

[0008] Furthermore, annular mounting grooves are formed at both ends of the rotating member, and annular protrusions are formed on the end surface of the static plate facing the rotating member, and the protrusions are respectively embedded in the corresponding mounting grooves.

[0009] Furthermore, the size of the slot is proportional to the viscous resistance of the fluid surrounding it.

[0010] Furthermore, the base plate is fixedly connected to the rotating shaft, and a plurality of connecting columns are arranged at intervals on the end surface of the base plate facing the movable plate; the connecting columns are connected to the movable plate to drive the movable plate to rotate.

[0011] Furthermore, a plurality of rotatable mounting platforms are provided on the movable plate, and one end of the mounting platforms facing the static plate is flush with the end surface of the movable plate, and a first magnet is embedded in one end of each mounting platform facing the static plate; a plurality of second magnets are provided on the static plate, and the plurality of second magnets correspond one-to-one to the plurality of first magnets; when the movable plate and the static plate are in contact, the first magnets and the second magnets attract each other; when the movable plate moves away from the static plate, the mounting platform rotates, causing the first magnets and the second magnets to repel each other.

[0012] Furthermore, a threaded hole is provided at one end of the mounting platform facing the movable plate; an external thread matching the threaded hole is formed at the top of the connecting column, and a plurality of connecting columns and a plurality of threaded holes correspond one to one; when the movable plate is pressed against the static plate, the connecting column partially extends into the threaded hole; when the movable plate is away from the static plate, the connecting column penetrates into the threaded hole, causing the mounting platform to rotate; wherein, after the connecting column is completely penetrated into the threaded hole, the mounting platform rotates 180° compared to the initial position.

[0013] Furthermore, a movable plate extends out of the mounting platform toward one end of the base plate, and a fastening ring is provided at the end of the mounting platform extending out of the movable plate; the fastening ring is sleeved on the outer periphery of the mounting platform and abuts against the end surface of the movable plate.

[0014] Furthermore, the number of the connecting columns is consistent with the number of the compression springs, and the plurality of compression springs are sleeved on the outer circumferences of the plurality of connecting columns in a one-to-one correspondence.

[0015] The beneficial effects of the present invention are: The reducer with dynamic seal at the shaft end of the present invention realizes spiral seal by setting a spiral seal groove at the end of the rotating shaft and sleeved with a rotating part. On this basis, sealing components capable of generating a fluid film are set at both ends of the rotating part, which not only further improves the sealing effect, but also reduces wear and increases the service life. During the rotation of the rotating shaft, when the rotating shaft deviates, the gap between the moving plate and the static plate changes. The gap in the area with the same deviation direction as the rotating shaft decreases, and the pressure of the fluid film increases; the gap in the area opposite to the deviation direction of the rotating shaft increases, and the pressure of the fluid film decreases. The static plate is subjected to a greater thrust from the fluid film in the area with the same deviation direction as the rotating shaft. By setting the static plate to press against the rotating part, the static plate is used to push the rotating part to rotate in the direction of the deviation of the rotating shaft, so that the axis of the rotating part is close to the axis of the rotating shaft, the coaxiality between the rotating part and the rotating shaft is improved, thereby improving the sealing effect.

[0016] Furthermore, the reducer with dynamic shaft end seal of the present invention is provided with a first magnet on the moving plate and a second magnet on the stationary plate. When the moving plate and the stationary plate are fitted, the first magnet and the second magnet attract each other, so that the moving plate and the stationary plate are fitted more closely, thereby further improving the sealing effect. When the moving plate is set away from the stationary plate, the first magnet and the second magnet repel each other, and the repulsive force between the magnets is used to better promote the rotation of the rotating part, further improving the coaxiality between the rotating part and the rotating shaft, and ensuring the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. In the accompanying drawings: Figure 1 is a schematic structural diagram of a reducer with a shaft end dynamic seal according to an embodiment of the present invention; Figure 2 is an exploded schematic diagram of a reducer with a shaft end dynamic seal according to an embodiment of the present invention; Figure 3 is a schematic structural diagram from another angle of a reducer with a shaft end dynamic seal according to an embodiment of the present invention; Figure 4 is along Figure 3 A schematic cross-sectional view taken along the cutting line AA in FIG. Figure 5 yes Figure 4 Schematic enlargement of region B; Figure 6 yes Figure 5 Schematic enlargement of region C; Figure 7yes Figure 5 A schematic diagram of the structure in which the rotating shaft is in a rotating state; Figure 8 yes Figure 7 A schematic enlarged view of the middle region D; Fig. 9 is a schematic structural diagram of a static plate according to an embodiment of the present invention; Fig.10 is a schematic structural diagram of a moving plate according to an embodiment of the present invention; Fig.11 is a schematic structural diagram of a substrate according to an embodiment of the present invention; Fig.12 is a schematic structural diagram of a rotating member according to an embodiment of the present invention; Fig.13 is a schematic structural diagram of a mounting base according to an embodiment of the present invention; Fig.14 is a schematic structural diagram of a mounting platform and a fastening ring according to an embodiment of the present invention; in: 100, housing; 110, mounting hole; 200, rotating shaft; 210, spiral sealing groove; 220, bearing; 300, rotating part; 310, spherical surface; 320, mounting groove; 400, sealing assembly; 410, stationary plate; 411, protrusion; 412, second magnet; 420, moving plate; 421, slot; 422, mounting platform; 423, first magnet; 424, threaded hole; 425, fastening ring; 426, sealing ring; 430, base plate; 431, connecting column; 432, external thread; 440, compression spring; 500, mounting seat; 510, first component; 520, second component; 530, spherical groove; 540, annular mounting plate; 541, fastening hole; 550, fastener; 560, sealing strip; 600, annular end cover; 610, end plate; 620, mounting cylinder. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The terms "first" and "second" herein are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0020] Unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed", "coupled" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0021] It should be understood that the terms "radial", "axial", "circumferential", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and 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, and therefore cannot be understood as a limitation on the present invention.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being “on” or “under” a second feature may mean that the first and second features are in direct contact with each other, or the first and second features are in indirect contact with each other through an intermediate medium.

[0023] Refer to the following Figures 1 to 14 To describe a reducer with a shaft end dynamic seal provided by the present invention.

[0024] This embodiment provides a reducer with a shaft end dynamic seal. The reducer with a shaft end dynamic seal generally may include: a housing 100 , a rotating shaft 200 , a rotating member 300 and two sealing assemblies 400 .

[0025] Symmetrical mounting holes 110 are formed on both sides of the housing 100. The rotating shaft 200 is arranged on the housing 100. One end of the rotating shaft 200 is arranged in one mounting hole 110, and the other end passes through the symmetrical mounting hole 110 and extends out of the housing 100. The rotating member 300 is annular, sleeved on the end of the rotating shaft 200 extending out of the housing 100, and is located in the corresponding mounting hole 110. An annular spherical curved surface 310 is formed on the side wall surface of the rotating member 300. A spiral sealing groove 210 is formed on the rotating shaft 200 in an area corresponding to the rotating member 300.

[0026] Two sealing assemblies 400 are sleeved on the rotating shaft 200 and are respectively located at the axial ends of the rotating member 300. Each sealing assembly 400 includes a static plate 410 sleeved on the rotating shaft 200, a dynamic plate 420 and a base plate 430, the static plate 410 abuts against the rotating member 300; the dynamic plate 420 is arranged between the static plate 410 and the base plate 430; a plurality of spiral grooves 421 are arranged at intervals on the end surface of the dynamic plate 420 facing the static plate 410, and one end of the groove 421 away from the axis of the dynamic plate 420 passes through the side wall of the dynamic plate 420; a plurality of compression springs 440 are arranged between the base plate 430 and the dynamic plate 420.

[0027] During the rotation of the rotating shaft 200, the moving plate 420 is configured to rotate under the drive of the rotating shaft 200, so that dynamic pressure is formed in the slot 421, attracting the surrounding fluid to form a fluid film between the moving plate 420 and the static plate 410; the rotating member 300 is configured to rotate around the center of the spherical surface 310 under the push of the static plate 410, so that the coaxiality of the rotating member 300 and the rotating shaft 200 is improved. After the rotating shaft 200 stops rotating, the moving plate 420 is pressed against the static plate 410 by a plurality of compression springs 440.

[0028] Since the housing 100 is filled with lubricating oil and the reducer generates heat during operation, the internal pressure of the reducer is greater than the external pressure. A spiral seal is achieved by providing a spiral sealing groove 210 at the end of the rotating shaft 200 and sleeved with a rotating member 300. The spiral sealing groove 210 is filled with sealing liquid, which can be the lubricating oil in the housing 100 or other liquid used for sealing that is separately filled during assembly. It is understandable that the rotation direction of the spiral sealing groove 210 is compatible with the rotation direction of the rotating shaft 200. Figure 1 For example, when the spiral seal groove 210 rotates right, the rotation direction of the shaft 200 is counterclockwise; when the spiral seal groove 210 rotates left, the rotation direction of the shaft 200 is clockwise. As the shaft 200 rotates, the sealing liquid in the spiral seal groove 210 is continuously pushed toward the inside of the housing 100, so that the pressure of the spiral seal groove 210 close to the inside of the housing 100 gradually increases, thereby improving the sealing effect.

[0029] On this basis, sealing components 400 capable of generating a fluid film are provided at both ends of the rotating member 300, which not only further improves the sealing effect, but also reduces the risk of wear and increases the service life.

[0030] During the rotation of the rotating shaft 200, when the rotating shaft 200 deviates, the gap between the moving plate 420 and the stationary plate 410 changes. The gap in the area in the same direction as the deviation of the rotating shaft 200 decreases, and the pressure of the fluid film increases; the gap in the area opposite to the deviation direction of the rotating shaft 200 increases, and the pressure of the fluid film decreases. The static plate 410 is subjected to a greater thrust in the area in the same direction as the deviation of the rotating shaft 200. By setting the static plate 410 to abut against the rotating member 300, the static plate 410 is used to push the rotating member 300 to rotate in the direction of the deviation of the rotating shaft 200, so that the axis of the rotating member 300 is close to the axis of the rotating shaft 200, thereby improving the coaxiality between the rotating member 300 and the rotating shaft 200, and further improving the sealing effect.

[0031] In some embodiments, a sealing ring 426 may be further provided between the moving plate 420 and the rotating shaft 200 to further improve the sealing effect.

[0032] like Figure 4 As shown, a bearing 220 is sleeved on the end of the rotating shaft 200 extending out of the housing 100, and the bearing 220 is arranged on the side of the sealing assembly 400 facing the inside of the housing 100. The end of the rotating shaft 200 that does not extend out of the housing 100 is only installed in the corresponding mounting hole 110 through the sleeved bearing 220. Generally, a circular end cover can be provided at the mounting hole 110 to close the mounting hole 110 and complete the sealing.

[0033] The reducer with a shaft end dynamic seal may generally further include: a mounting seat 500 , an annular end cover 600 and a plurality of fasteners 550 .

[0034] The mounting seat 500 is sleeved on the outer periphery of the rotating member 300, and an annular spherical groove 530 adapted to the spherical curved surface 310 of the rotating member 300 is formed on the inner wall surface of the mounting seat 500. An annular mounting plate 540 is respectively provided at both ends of the mounting seat 500, and a plurality of fastening holes 541 are arranged at intervals on the mounting plate. The annular end cover 600 is fixedly mounted on the housing 100 and sleeved on the outer periphery of the mounting seat 500. The annular end cover 600 includes an end plate 610 mounted on the side wall of the housing 100, and a mounting cylinder 620 extending from the end plate 610 into the mounting hole 110. An annular step surface adapted to the annular mounting plate 540 is correspondingly provided on the mounting cylinder 620; a plurality of fasteners 550 are arranged one by one corresponding to the plurality of fastening holes 541. Each fastener 550 passes through the corresponding fastening hole 541 and is connected to the annular step surface.

[0035] In the solution of this embodiment, a mounting seat 500 adapted to the rotating member 300 is provided, and the spherical groove 530 of the mounting seat 500 is used to guide the rotation of the rotating member 300, so that the rotation of the rotating member 300 is smoother.

[0036] An annular mounting plate 540 is provided on the mounting seat 500, and a corresponding annular step surface is provided on the inner wall of the mounting tube 620, which not only makes the connection between the mounting seats 500 and 500 tighter, but also the step-shaped contact surface reduces the risk of leakage and improves the sealing effect.

[0037] The mounting base 500 is mounted on the annular end cover 600 by using a plurality of fasteners 550, so that the mounting base 500 is fixed relative to the housing 100, thereby improving the structural stability of the device. In some embodiments, the fasteners 550 may be screws or bolts.

[0038] In some embodiments, a plurality of fastening bolts may be disposed on the end plate 610 of the annular end cover 600 to fix the annular end cover 600 to the housing 100 .

[0039] At least one sealing strip 560 is disposed between the mounting seat 500 and the rotating member 300 .

[0040] In the solution of this embodiment, a sealing strip 560 is provided between the mounting seat 500 and the rotating member 300, thereby further improving the sealing effect.

[0041] like Figure 5 As shown, in some embodiments, the mounting seat 500 may be composed of a first member 510 and a second frame, and the first member 510 and the second member 520 are symmetrically arranged along the radial direction. The first member 510 and the second member 520 are sleeved on the rotating member 300 and butted together, which reduces the installation difficulty of the mounting seat 500. A sealing strip 560 is arranged between the first member 510, the second member 520 and the rotating member 300 of the mounting seat 500 to improve the sealing effect.

[0042] Annular mounting grooves 320 are formed at both ends of the rotating member 300 , and annular protrusions 411 are formed on the end surfaces of the static plate 410 facing the rotating member 300 . The protrusions 411 are respectively embedded in the corresponding mounting grooves 320 .

[0043] The solution of this embodiment, by respectively setting the protrusion 411 and the installation groove 320 on the static plate 410 and the rotating member 300, utilizes its embedded structure, not only improves the connection tightness of the static plate 410 and the rotating member 300, but also avoids the radial movement of the static plate 410, and improves the structural stability. The annular structure of the protrusion 411 and the installation groove 320 makes the contact force between the static plate 410 and the rotating member 300 more evenly distributed.

[0044] The size of the slot 421 is proportional to the viscous resistance of the fluid surrounding it.

[0045] The greater the viscous resistance of the fluid, the greater the dynamic pressure required to attract the fluid to form a fluid film, and the larger the size of the slot 421.

[0046] In the solution of this embodiment, the size of the slot 421 is proportional to the viscous resistance of the fluid around it, which ensures that the slot 421 can have sufficient dynamic pressure to allow the fluid film to be formed smoothly, thereby ensuring the sealing effect.

[0047] In some embodiments, the housing 100 is filled with lubricating oil, and the sealing assembly 400 disposed on the inner side of the housing 100 attracts the surrounding lubricating oil to form an oil film during the rotation of the rotating shaft 200. The sealing assembly 400 disposed on the outer side of the housing 100 attracts the surrounding air to form an air mold during the rotation. The viscous resistance of the oil film is relatively large, and the size of the slot 421 of the sealing assembly 400 disposed on the inner side of the housing 100 is also correspondingly set larger, and the pressure of the formed oil film is also greater, which is more conducive to driving the rotating member 300 to rotate, improving the coaxiality between the rotating member 300 and the rotating shaft 200, and thus improving the sealing effect.

[0048] The base plate 430 is fixedly connected to the rotating shaft 200, and a plurality of connecting posts 431 are arranged at intervals on the end surface of the base plate 430 facing the movable plate 420. The connecting posts 431 are connected to the movable plate 420 to drive the movable plate 420 to rotate.

[0049] In the solution of this embodiment, a connecting column 431 is provided on the base plate 430 , and the connecting column 431 is used to connect the movable plate 420 and the base plate 430 , so that the movable plate 420 can rotate synchronously with the rotating shaft 200 .

[0050] In some embodiments, the movable plate 420 is provided with a through hole adapted to the connecting column 431 , so that the connecting column 431 can drive the movable plate 420 to rotate, and the movable plate 420 can move axially along the connecting column 431 under the push of the fluid film.

[0051] In other embodiments, the movable plate 420 and the rotating shaft 200 may be connected by a key. A first keyway is provided in the axial direction of the rotating shaft 200, a key is provided in the keyway, and a corresponding second keyway is provided on the inner wall surface of the movable plate 420. The second keyway is provided as a through slot, which is not only convenient for installation, but also enables the movable plate 420 to rotate and move in the axial direction under the push of the fluid film when the rotating shaft 200 rotates.

[0052] A plurality of rotatable mounting platforms 422 are provided on the movable plate 420, and one end of the mounting platforms 422 facing the static plate 410 is flush with the end surface of the movable plate 420, and a first magnet 423 is embedded in one end of each mounting platform 422 facing the static plate 410. A plurality of second magnets 412 are provided on the static plate 410, and the plurality of second magnets 412 correspond one to one with the plurality of first magnets 423. When the movable plate 420 and the static plate 410 are in contact, the first magnets 423 and the second magnets 412 attract each other. When the movable plate 420 moves away from the static plate 410, the mounting platform 422 rotates, causing the first magnets 423 and the second magnets 412 to repel each other.

[0053] The solution of this embodiment is to set the first magnet 423 on the moving plate 420 and the second magnet 412 on the static plate 410. When the moving plate 420 and the static plate 410 are in contact with each other (i.e. when the rotating shaft 200 stops rotating), the first magnet 423 and the second magnet 412 attract each other, so that the moving plate 420 and the static plate 410 are in contact with each other more closely, thereby further improving the sealing effect. When the moving plate 420 is set away from the static plate 410 (i.e. when the rotating shaft 200 rotates), the first magnet 423 and the second magnet 412 repel each other, and the repulsive force between the magnets is used to better promote the rotation of the rotating member 300, thereby further improving the coaxiality between the rotating member 300 and the rotating shaft 200 and ensuring the sealing effect. In addition, the first magnet 423 and the second magnet 412 are distributed at intervals on the moving plate 420 and the stationary plate 410, so that the magnetic repulsion force exerted on the moving plate 420 during rotation is not constant, but a changing magnetic repulsion force with a certain impact, which is more conducive to promoting the rotation of the rotating part 300, further improving the coaxiality between the rotating part 300 and the rotating shaft 200, and enhancing the sealing effect.

[0054] like Figure 9-10 As shown, the first magnet 423 and the second magnet 412 can be long strip magnets, and the length direction of the first magnet 423 and the second magnet 412 are consistent with the radial direction of the rotating shaft 200. The setting direction of the magnetic poles of the multiple first magnets 423 on the moving plate 420 is consistent (that is, the magnetic poles located in the inner circle and the outer circle are respectively kept uniform), and the setting direction of the magnetic poles of the multiple second magnets 412 on the static plate 410 is also consistent. When the static plate 410 and the moving plate 420 are attached, the magnetic poles of the first magnet 423 are exactly opposite to the magnetic poles of the opposite second magnet 412, so that the moving plate 420 is tightly attached to the static plate 410.

[0055] In some preferred embodiments, the plurality of first magnets 423 and the plurality of second magnets 412 are uniformly distributed along the circumferential direction.

[0056] In some embodiments, a threaded hole 424 is provided at one end of the mounting platform 422 facing the movable plate 420. An external thread 432 adapted to the threaded hole 424 is formed at the top of the connecting column 431, and a plurality of connecting columns 431 and a plurality of threaded holes 424 correspond one to one. When the movable plate 420 is close to the static plate 410, the connecting column 431 partially extends into the threaded hole 424. When the movable plate 420 is away from the static plate 410, the connecting column 431 penetrates into the threaded hole 424, causing the mounting platform 422 to rotate. After the connecting column 431 completely penetrates into the threaded hole 424, the mounting platform 422 rotates 180° compared to the initial position.

[0057] By setting a threaded hole 424 on the mounting platform 422, setting an external thread 432 on the connecting column 431, and setting the margin in the threaded hole 424 for the connecting column 431 to continue to rotate deeply to make the mounting platform 422 rotate 180 degrees. The force of the fluid film pushing the moving plate 420 to move drives the rotation of the mounting platform 422, so that the relative magnetic poles of the first magnet 423 and the second magnet 412 are changed from opposite magnetic poles to the same magnetic poles, thereby changing the magnetic force between the moving plate 420 and the static plate 410 from attraction to repulsion, and the structure is exquisite, stable and reliable.

[0058] In other embodiments, the number of turns of the external thread 432 on the connecting column 431 is specially set so that after the connecting rod is assembled with the threaded hole 424 of the movable plate 420, when the connecting rod rotates in the direction of entering the threaded hole 424, the connecting rod can only continue to rotate half a turn relative to the threaded hole 424, and cannot continue to rotate due to the interference between the rod body and the thread. It is ensured that the number of turns that the mounting seat 500 can rotate is exactly half a turn, thereby changing the interaction between the magnetic poles of the first magnet 423 and the second magnet 412.

[0059] In some other embodiments, a rotating rod extending out of the movable plate 420 may be provided at one end of the mounting platform 422 facing the base plate 430, and a thread may be provided at the end of the rotating rod facing the base plate 430, and a corresponding screw hole may be provided on the connecting column 431. The rotating rod extends into the connecting column 431, and the threads of the rotating rod and the connecting column 431 cooperate to drive the mounting platform 422 to rotate when the movable plate 420 moves along the axial direction.

[0060] The mounting platform 422 extends out of the movable plate 420 at one end toward the base plate 430, and a fastening ring 425 is provided at the end of the mounting platform 422 extending out of the movable plate 420. The fastening ring 425 is sleeved on the outer periphery of the mounting platform 422 and abuts against the end surface of the movable plate 420.

[0061] In the solution of this embodiment, the fastening ring 425 is provided to limit the mounting platform 422, thereby reducing the risk of the mounting platform 422 falling off the driven plate 420 and improving the structural stability.

[0062] In some embodiments, the diameter of the portion of the mounting platform 422 where the first magnet 423 is embedded is larger than the diameter of the portion where the threaded hole 424 is formed, so that an annular limiting step surface is formed on the side wall surface of the mounting platform 422. The movable plate 420 is provided with a step hole that matches the shape of the mounting platform 422 to further reduce the risk of the mounting platform 422 falling off and improve the structural stability.

[0063] In some embodiments, the fastening ring 425 may include two half rings connected together by bolts. The fastening ring 425 is mounted on the mounting platform 422 by adjusting the bolts.

[0064] The number of the connecting posts 431 is consistent with the number of the compression springs 440 , and the plurality of compression springs 440 are sleeved on the outer circumferences of the plurality of connecting posts 431 in a one-to-one correspondence.

[0065] In the solution of this embodiment, a compression spring 440 is sleeved on the outer circumference of each connecting column 431, which not only improves the force uniformity of the movable plate 420, but also ensures the reset effect of the mounting platform 422. After the rotating shaft 200 stops rotating, under the pressure of the compression spring 440, the movable plate 420 is close to the static plate 410, and the connecting rod is away from the movable plate 420 and drives the mounting platform 422 to rotate, so that the magnetic force between the first magnet 423 and the second magnet 412 is transformed from repulsion to attraction.

[0066] In some preferred embodiments, the connecting columns 431 and the compression springs 440 may be evenly distributed along the circumferential direction on the movable plate 420 to further improve the force uniformity of the movable plate 420 and ensure the resetting effect of the movable plate 420 and the mounting platform 422 .

[0067] The specific working process of the reducer with shaft end dynamic seal provided by the present invention is described in combination with the above embodiments: The rotating shaft 200 starts to rotate, driving the base plate 430 to rotate. The base plate 430 drives the movable plate 420 to rotate through the connecting column 431. Dynamic pressure is generated in the pressure groove on the movable plate 420, attracting the surrounding fluid to generate a fluid film. Driven by the fluid film, the movable plate 420 moves away from the static plate 410 in the axial direction, causing the mounting platform 422 on the movable plate 420 to rotate. The first magnet 423 on the mounting platform 422 rotates to repel the second magnet 412 on the static plate 410.

[0068] During the rotation of the rotating shaft 200, when the rotating shaft 200 is offset, the gap in the area in the same offset direction as the rotating shaft 200 is reduced, and the pressure of the fluid film is increased, while the gap in the area opposite to the offset direction of the rotating shaft 200 is increased, and the pressure of the fluid film is reduced. The static plate 410 is subjected to a greater thrust in the area in the same offset direction as the rotating shaft 200, thereby pushing the rotating member 300 to rotate in the offset direction of the rotating shaft 200, so that the axis of the rotating member 300 is close to the axis of the rotating shaft 200.

[0069] After the rotating shaft 200 stops rotating, the fluid film disappears, and the moving plate 420 is pressed close to the static plate 410 under the pressure of the compression spring 440. At the same time, the mounting platform 422 is driven to rotate in the opposite direction, so that the first magnet 423 on the mounting platform 422 is reset, and the magnetic force between the first magnet 423 and the second magnet 412 changes from repulsion to attraction, so that the moving plate 420 and the static plate 410 are closely attached.

[0070] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A reducer with a shaft end dynamic seal, characterized in that: include: A shell having symmetrical mounting holes formed on two sides thereof; A rotating shaft is arranged on the housing; one end of the rotating shaft is arranged in one of the mounting holes, and the other end passes through the symmetrical mounting holes and extends out of the housing; The rotating member is annular, sleeved on one end of the rotating shaft extending out of the housing, and located in the corresponding mounting hole; an annular spherical surface is formed on the side wall surface of the rotating member; a spiral sealing groove is formed on the rotating shaft in an area corresponding to the rotating member; Two sealing assemblies are sleeved on the rotating shaft and are respectively located at two axial ends of the rotating member; each of the sealing assemblies comprises a stationary plate, a moving plate and a base plate sleeved on the rotating shaft, the stationary plate abuts against the rotating member; the moving plate is arranged between the stationary plate and the base plate; a plurality of spiral grooves are arranged at intervals on the end surface of the moving plate facing the stationary plate, and one end of the groove away from the axis of the moving plate passes through the side wall of the moving plate; a plurality of compression springs are arranged between the base plate and the moving plate; During the rotation of the rotating shaft, the moving plate is configured to rotate under the drive of the rotating shaft, so that dynamic pressure is formed in the slot, and surrounding fluid is attracted to form a fluid film between the moving plate and the static plate. The rotating member is configured to rotate around the center of the spherical surface under the push of the static plate, so that the coaxiality of the rotating member and the rotating shaft is improved; After the rotating shaft stops rotating, the movable plate is pressed against the stationary plate under the pressure of the plurality of compression springs.

2. The reducer with shaft end dynamic seal according to claim 1, characterized in that: Also includes: A mounting seat is sleeved on the outer periphery of the rotating member, and an annular spherical groove is formed on the inner wall surface of the mounting seat to match the spherical curved surface of the rotating member; An annular mounting plate is respectively disposed at both ends of the mounting seat, and a plurality of fastening holes are arranged at intervals on the mounting plate; an annular end cover, fixedly mounted on the housing and sleeved on the outer periphery of the mounting seat; the annular end cover comprises an end plate mounted on the side wall of the housing, and a mounting tube extending from the end plate into the mounting hole; the mounting tube is correspondingly provided with an annular step surface adapted to the mounting plate; A plurality of fasteners are arranged corresponding to the plurality of fastening holes one by one; each of the fasteners passes through the corresponding fastening hole and is connected to the annular step surface.

3. The reducer with shaft end dynamic seal according to claim 2, characterized in that: At least one sealing strip is arranged between the mounting seat and the rotating member.

4. The reducer with shaft end dynamic seal according to claim 1, characterized in that: Annular mounting grooves are respectively formed at both ends of the rotating member, and annular protrusions are respectively formed on the end surface of the static plate facing the rotating member, and the protrusions are respectively embedded in the corresponding mounting grooves.

5. The reducer with shaft end dynamic seal according to claim 1, characterized in that: The size of the slot is proportional to the viscous resistance of the fluid surrounding it.

6. The reducer with shaft end dynamic seal according to claim 1, characterized in that: The base plate is fixedly connected to the rotating shaft, and a plurality of connecting columns are arranged at intervals on the end surface of the base plate facing the moving plate; The connecting column is connected to the movable plate to drive the movable plate to rotate.

7. The reducer with shaft end dynamic seal according to claim 6, characterized in that: The movable plate is provided with a plurality of rotatable mounting platforms, one end of the mounting platforms facing the static plate is flush with the end surface of the movable plate, and each of the mounting platforms is embedded with a first magnet at one end facing the static plate; A plurality of second magnets are disposed on the static plate, and the plurality of second magnets correspond one-to-one to the plurality of first magnets; When the moving plate and the static plate are attached, the first magnet and the second magnet are attracted to each other; when the moving plate moves away from the static plate, the mounting platform rotates to make the first magnet and the second magnet repel each other.

8. The reducer with shaft end dynamic seal according to claim 7, characterized in that: A threaded hole is provided at one end of the mounting platform facing the movable plate; an external thread matching the threaded hole is formed on the top of the connecting column, and a plurality of the connecting columns and a plurality of the threaded holes correspond one to one; When the moving plate is close to the static plate, the connecting column partially extends into the threaded hole; when the moving plate is away from the static plate, the connecting column penetrates into the threaded hole to rotate the mounting platform; wherein, After the connecting column is completely inserted into the threaded hole, the mounting platform is rotated 180° compared to the initial position.

9. The reducer with shaft end dynamic seal according to claim 8, characterized in that: The mounting platform extends the movable plate toward one end of the base plate, and a fastening ring is provided at the end of the mounting platform extending from the movable plate; the fastening ring is sleeved on the outer periphery of the mounting platform and abuts against the end surface of the movable plate.

10. The reducer with shaft end dynamic seal according to claim 8, characterized in that: The number of the connecting columns is consistent with the number of the compression springs, and the plurality of compression springs are sleeved on the outer circumferences of the plurality of connecting columns in a one-to-one correspondence.

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