High-sealing-performance three-phase asynchronous motor

Abstract

The invention provides a high-sealing-performance three-phase asynchronous motor which comprises a shell, a stator is fixedly connected in the shell, a rotor is rotationally connected in the shell, the rotor is located in the stator, a junction box is fixedly connected to the outer wall of the shell, a sealing cover is connected to an opening of the junction box, a terminal is fixedly connected to the junction box, the terminal is connected with the stator, and the stator is connected with the sealing cover. The junction box further comprises a sealing pipe made of rubber, the sealing pipe is provided with a sealing hole for a wire to penetrate through, the sealing hole is in interference fit with the wire, the side wall of the junction box is fixedly connected with a supporting pipe, the supporting pipe is communicated with the junction box, the supporting pipe is in threaded connection with a fixing pipe, and an elastic clamping pipe is arranged in the supporting pipe. The sealing pipe penetrates through the fixing pipe, the elastic clamping pipe and the supporting pipe and then extends into the junction box, the fixing pipe rotates in the direction close to the supporting pipe and enables the elastic clamping pipe to clamp the sealing pipe through the linkage assembly, and therefore the purpose of being suitable for being used under a mine is achieved.

Description

Technical Field

[0001] The invention relates to a motor, in particular to a three-phase asynchronous motor with high sealing performance. Background Art

[0002] The three-phase AC asynchronous motor is an electric traction device that converts electrical energy into mechanical energy. It is mainly composed of a stator, a rotor and the air gap between them.

[0003] At present, a Chinese patent with the authorization announcement number CN214707366U discloses a three-phase asynchronous motor, which includes a housing, a stator disposed in the housing, and a rotor disposed in the housing, the housing is provided with a support seat, the housing includes a shell, an end cover disposed in the shell, and a cover shell disposed in the shell, and the end cover is integrally arranged with the shell. It has the effect of improving the problem of high noise of the three-phase asynchronous motor.

[0004] However, when this three-phase asynchronous motor is working, the cover on the junction box needs to be removed, and then the wires need to be connected to the connectors of the junction box. The wires will be exposed to the outside, and when it needs to be used underground, it is easy to cause safety accidents due to the presence of a certain concentration of explosive gas in the mine. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a three-phase asynchronous motor with high sealing performance, so as to achieve the purpose of being suitable for use in mines.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a highly sealed three-phase asynchronous motor, comprising a shell, a stator fixedly connected in the shell, a rotor rotatably connected in the shell, the rotor being located inside the stator, a junction box fixedly connected on the outer wall of the shell, a sealing cover connected at the opening of the junction box, a terminal fixedly connected on the junction box, the terminal being connected to the stator, and also comprising a sealing tube made of rubber, a sealing hole for passing an electric wire is opened on the sealing tube, the sealing hole is interference fit with the electric wire, a supporting tube fixedly connected on the side wall of the junction box, the supporting tube is connected to the junction box, a fixed tube is threadedly connected on the supporting tube, an elastic clamping tube is arranged in the supporting tube, the sealing tube passes through the fixed tube, the elastic clamping tube and the supporting tube and then extends into the junction box, the fixed tube rotates in a direction close to the support tube and the elastic clamping tube clamps the sealing tube through a linkage component.

[0007] To implement the above technical solution, a sealing tube is sleeved on the electric wire, a gap between the sealing tube and the electric wire is small, the sealing tube is passed through the fixed tube, the elastic clamp tube and the support tube and then extended into the junction box, the electric wire is then connected to the terminal, the sealing cover is fixed at the opening, the fixed tube is rotated, and the elastic clamp tube is clamped to the sealing tube through the linkage assembly, so that explosive gas is not easy to enter the junction box from between the elastic clamp tube and the sealing tube and between the fixed tube and the elastic clamp tube, thereby meeting the purpose of use in mines.

[0008] As a preferred embodiment of the present invention, the linkage assembly includes a contact ring, a contact slope and an elastic groove, the contact slope is arranged on the outer wall of the elastic clamp tube, the contact slope is used to contact with the inner wall of the support tube, a plurality of elastic grooves are arranged on the elastic clamp tube and connect the outer wall and the inner wall of the elastic clamp tube, the elastic groove is arranged along the axial direction of the elastic clamp tube, the contact ring is fixedly connected to the inner wall of the fixed tube and contacts with the end of the elastic clamp tube, and after the elastic clamp tube is pressed against the sealing tube, the two opposite inner walls of the elastic groove are pressed against each other.

[0009] To implement the above technical solution, the fixed tube rotates toward the supporting tube, the abutment ring abuts against the end of the elastic clamp tube, so that the abutment slope abuts against the inner wall of the supporting tube, and the elastic clamp tube is deformed toward the sealing tube by setting the elastic groove, so that the elastic clamp tube clamps the sealing tube, and at the same time, the width of the elastic groove gradually decreases until the two inner walls of the elastic groove abut against each other. At this time, it is not easy for explosive gas to enter the junction box from between the elastic clamp tube of the sealing tube and between the fixed tube and the elastic clamp tube.

[0010] As a preferred solution of the present invention, a connecting block is fixedly connected to the outer wall of the support tube, a fixing bolt is arranged on the outer wall of the fixing tube, and the fixing bolt is threadedly connected to the connecting block.

[0011] To implement the above technical solution, after the elastic clamp clamps the sealing tube, a threaded hole is opened on the connecting block, and the fixing bolt is threadedly connected to the threaded hole to achieve relative fixation between the fixing tube and the supporting tube; to avoid the vibration generated during the operation of the motor causing the fixing tube to loosen from the supporting tube.

[0012] As a preferred solution of the present invention, the sealing cover is threadedly connected to the junction box, and a sealing ring is fixedly connected to the edge of the sealing cover, and the sealing ring is tightly pressed against the opening.

[0013] By implementing the above technical solution, it is difficult for explosive gas to enter the junction box from between the sealing cover and the opening.

[0014] As a preferred solution of the present invention, an extension tube is fixedly connected to the inner wall of the junction box, a plurality of elastic clamping plates are fixedly connected to the end of the extension tube, a drive tube is threadedly connected to the extension tube, and the sealing tube passes through the extension tube and the drive tube; The driving tube rotates toward the direction approaching the extension tube and causes the elastic clamping plate to clamp the sealing tube through the conductive structure, and then causes two adjacent elastic clamping plates to press against each other.

[0015] To implement the above technical solution, the driving tube is rotated, and the multiple elastic clamps are clamped to the sealing tube through the conductive structure, so that explosive gas is not easy to enter the junction box from between the elastic clamps and the sealing tube, so as to further improve safety.

[0016] As a preferred embodiment of the present invention, the conductive structure includes a first inclined surface, a second inclined surface, and a sealing inclined surface. The first inclined surface is provided on the elastic clamp, the second inclined surface is provided on the inner wall of the driving tube and is used to contact the first inclined surface, and the sealing inclined surface is provided on the side wall of the elastic clamp. After the elastic clamp is pressed against the sealing tube, the adjacent sealing inclined surfaces are pressed against each other.

[0017] To implement the above technical solution, the driving tube rotates toward the extension tube, the first inclined surface abuts against the second inclined surface, causing the elastic splint to bend toward the sealing tube, so that the elastic splint and the sealing tube are pressed tightly together. As the driving tube continues to rotate until two adjacent sealing inclined surfaces are pressed tightly together, it is difficult for explosive gas to enter the junction box from between the elastic splint and the sealing tube and between two adjacent elastic splints, thereby further improving safety.

[0018] As a preferred solution of the present invention, a sealing ring is fixedly connected to the inner wall of the driving tube and is used to press against the outer wall of the sealing tube.

[0019] By implementing the above technical solution, it is difficult for explosive gas to pass through between the drive tube and the sealing tube, thereby further improving safety.

[0020] As a preferred solution of the present invention, during the rotation of the sealing cover, the driving tube is caused to rotate synchronously through the connecting structure.

[0021] Implement the above technical solution to improve installation convenience.

[0022] As a preferred solution of the present invention, the connection structure includes a telescopic rod, a gear ring, and a gear. One end of the telescopic rod is connected to the sealing cover, and the other end of the telescopic rod is connected to the gear ring. The gear is rotatably connected to the outer wall of the driving tube and connected to the driving tube through a spring, and the gear ring is meshed with the gear.

[0023] To implement the above technical solution, during the rotation of the sealing cover, the gear ring drives the gear to rotate, and the gear drives the driving tube to rotate through the spring. As the sealing cover gradually moves closer to the junction box, the telescopic rod shortens, the elastic splint and the sealing tube are pressed tightly, and the driving tube cannot continue to rotate. At this time, the gear and the driving tube produce relative rotation, and then the sealing cover is pressed tightly against the opening.

[0024] As a preferred solution of the present invention, the telescopic rod includes a sleeve and an inner rod, the sleeve is fixed on the sealing cover, a plurality of the sleeves are evenly distributed along the axis of the sealing cover, each sleeve is slidably connected to the inner rod, and one end of the inner rod away from the sleeve is fixedly connected to the gear ring.

[0025] To implement the above technical solution, when the sealing cover gradually moves closer to the junction box, the inner rod moves closer to the sleeve, and the gear ring moves more smoothly to avoid the gear ring from being separated from the gear.

[0026] In summary, the invention has the following beneficial effects: 1. By applying pressure at both ends of the sealing tube, it is difficult for explosive gas to enter the junction box; 2. During the rotation of the sealing cover, the driving pipe rotates synchronously to improve the installation efficiency; 3. The motor will vibrate when working. Due to the linkage effect between the sealing cover and the driving tube, the friction force is greatly increased, making it difficult for the sealing cover and the driving tube to loosen. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the external structure in the embodiment; Figure 2 A schematic diagram showing the structure of the shell; Figure 3 To show the schematic diagram of the connection structure between the sealing tube and the wire; Figure 4 A schematic diagram showing the structure of the elastic clamping tube; Figure 5 A schematic diagram showing the structure of the extension tube; Figure 6 To show the structural diagram of the gear; Figure 7 A schematic diagram showing the structure of the sealing cover; Figure 8 It is a schematic diagram of embodiment 2.

[0028] 1. Shell; 11. Rotor; 2. Junction box; 21. Terminal; 3. Sealing tube; 31. Sealing hole; 32. Electric wire; 41. Support tube; 411. Protective tube; 412. Connecting block; 42. Fixing tube; 421. Fixing bolt; 43. Elastic clamping tube; 5. Linkage assembly; 51. Resistance ring; 52. Resistance slope; 53. Elastic groove; 6. Extension tube; 61. Elastic clamping plate; 7. Driving tube; 8. Conducting structure; 81. First slope; 82. Second slope; 83. Sealing slope; 84. Sealing ring; 91. Sealing cover; 92. Sealing ring; 93. Connecting structure; 931. Telescopic rod; 932. Gear ring; 933. Gear; 934. Sleeve; 935. Inner rod; 100. Sliding hole; 101. Card; 102. Connecting hole; 103. Connecting slope. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0030] Embodiment 1: A highly sealed three-phase asynchronous motor comprises a housing 1, a stator is fixedly connected inside the housing 1, a rotor 11 is rotatably connected inside the housing 1, the rotor 11 is located inside the stator, and a bearing is provided between the rotor 11 and the housing 1 (not shown in the figure).

[0031] A junction box 2 is fixedly connected to the outer wall of the housing 1. The upper end of the junction box 2 is a circular opening, and a sealing cover 91 is connected to the opening. A terminal 21 is fixedly connected to the junction box 2, and the terminal 21 is connected to the stator.

[0032] The sealing tube 3 is made of rubber, and is provided with a sealing hole 31 for passing the electric wire 32, and the sealing hole 31 and the electric wire 32 are interference fit, so that the gap between the sealing hole 31 and the electric wire 32 is small. The sealing tube 3 is in the shape of a round tube.

[0033] A support tube 41 is fixedly connected to the side wall of the junction box 2, and the support tube 41 is in communication with the junction box 2. A fixed tube 42 is threadedly connected to the support tube 41, and a round elastic clamp tube 43 is inserted into the support tube 41. The sealing tube 3 passes through the fixed tube 42, the elastic clamp tube 43 and the support tube 41, and then extends into the junction box 2, and then the wire 32 is connected to the terminal 21.

[0034] The fixing tube 42 rotates toward the supporting tube 41 and causes the elastic clamping tube 43 to clamp the sealing tube 3 through the linkage assembly 5 .

[0035] The linkage assembly 5 includes a resistance ring 51, a resistance slope 52 and an elastic groove 53. The resistance slope 52 is provided on the outer wall of the elastic clamp tube 43, and the resistance slope 52 is used to resist the inner wall of the support tube 41. A plurality of elastic grooves 53 are provided on the elastic clamp tube 43 and connect the outer wall and the inner wall of the elastic clamp tube 43, and the plurality of elastic grooves 53 are evenly distributed along the axis of the elastic clamp tube 43.

[0036] The cross section of the abutment ring 51 is L-shaped and is fixedly connected to the inner wall of the fixed tube 42 and is used to abut against the end of the elastic clamp tube 43 to improve the sealing between the fixed tube 42 and the elastic clamp tube 43 and push the elastic clamp tube 43 to move.

[0037] The fixed tube 42 is rotated to move the fixed tube 42 toward the supporting tube 41, and the elastic clamp tube 43 moves toward the supporting tube 41. The abutting inclined surface 52 abuts against the inner wall of the end of the supporting tube 41, so that the elastic clamp tube 43 is deformed, and the inner wall of the elastic clamp tube 43 is pressed against the outer wall of the sealing tube 3. Subsequently, the two opposite inner walls of the elastic groove 53 are pressed against each other, that is, the elastic groove 53 is closed. At this time, there is sealing between the fixed tube 42 and the elastic clamp tube 43, and there is sealing between the elastic clamp tube 43 and the sealing tube 3, so that explosive gas is not easy to enter the supporting tube 41.

[0038] A protective tube 411 having an L-shaped cross section is integrally connected to the outside of the support tube 41 , and the protective tube 411 is sleeved on the outside of the end of the fixing tube 42 .

[0039] A connecting block 412 is fixedly connected to the outer wall of the protective tube 411, and a fixing bolt 421 is passed through the outer wall of the fixed tube 42. The fixing bolt 421 is threadedly connected to the connecting block 412. After the sealing tube 3 is fixed by the elastic clamp tube 43, vibration is generated during the start-up of the motor, making it difficult for the fixed tube 42 to rotate with the support tube 41.

[0040] A circular extension tube 6 is fixedly connected to the inner wall of the junction box 2. The extension tube 6 is coaxially arranged with the support tube 41. A plurality of elastic clamps 61 are fixedly connected to the end of the extension tube 6, and the plurality of elastic clamps 61 are evenly distributed along the axis of the extension tube 6. A drive tube 7 is threadedly connected to the extension tube 6, and the sealing tube 3 passes through the extension tube 6 and the drive tube 7 and then extends toward the middle of the junction box 2.

[0041] The driving tube 7 rotates toward the extension tube 6 and causes the elastic clamping plates 61 to clamp the sealing tube 3 through the conductive structure 8 , and then causes two adjacent elastic clamping plates 61 to press against each other.

[0042] The conducting structure 8 includes a first inclined surface 81, a second inclined surface 82, and a sealing inclined surface 83. The first inclined surface 81 is provided on the elastic clamp 61, and the second inclined surface 82 is provided on the inner wall of the driving tube 7 and is used to contact with the first inclined surface 81. The sealing inclined surface 83 is provided on the side wall of the elastic clamp 61. The driving tube 7 is rotated in the direction close to the extension tube 6, and the first inclined surface 81 contacts with the second inclined surface 82, so that the elastic clamp 61 is bent and pressed against the sealing tube 3. After the elastic clamp 61 is pressed against the sealing tube 3, the adjacent sealing inclined surfaces 83 are pressed against each other. The elastic clamp 61 is pressed against the sealing tube 3 to have sealing properties, and the adjacent sealing inclined surfaces 83 are pressed against each other to have sealing properties between the driving tube 7 and the elastic clamp 61, and between the elastic clamp 61 and the elastic clamp 61.

[0043] A sealing ring 84 is fixedly connected to the inner wall of the driving tube 7 and is used to press against the outer wall of the sealing tube 3 , so that the driving tube 7 and the sealing tube 3 are also sealed.

[0044] Thereby, both ends of the sealing tube 3 are sealed.

[0045] The sealing cover 91 is threadedly connected to the junction box 2, and a circular sealing ring 92 is fixedly connected to the edge of the sealing cover 91. The sealing ring 92 is used to press against the opening to ensure good sealing between the sealing cover 91 and the junction box 2.

[0046] During the rotation of the sealing cover 91, the driving tube 7 is synchronously rotated through the connecting structure 93. The connecting structure 93 includes a telescopic rod 931, a toothed ring 932, and a gear 933. One end of the telescopic rod 931 is connected to the sealing cover 91, and the other end of the telescopic rod 931 is connected to the toothed ring 932. A plurality of telescopic rods 931 are evenly distributed along the axis of the sealing cover 91. The gear 933 is sleeved on the outer wall of the driving tube 7 so that the gear 933 is rotatably connected to the driving tube 7. A spring is fixedly connected between the end of the gear 933 and the end of the driving tube 7. The gear 933 is coaxially arranged with the driving tube 7. The toothed ring 932 is meshed with the gear 933.

[0047] The telescopic rod 931 includes a sleeve 934 and an inner rod 935. The sleeve 934 is fixed to the sealing cover 91, and a plurality of sleeves 934 are evenly distributed along the axis of the sealing cover 91, and an inner rod 935 is slidably connected in each sleeve 934. One end of the inner rod 935 away from the sleeve 934 is fixedly connected to the gear ring 932. The sleeve 934 and the inner rod 935 are connected by a spring, and through the action of the elastic force, the gear ring 932 has sufficient force to rotate the gear 933.

[0048] During the rotation of the sealing cover 91, the gear 933 is driven to rotate by the gear ring 932, and the gear 933 drives the driving tube 7 to rotate through the spring, so that the elastic clamping plate 61 clamps the sealing tube 3, and the two adjacent sealing inclined surfaces 83 are pressed tightly. After the driving tube 7 is tightened, the sealing cover 91 continues to rotate, and the spring between the driving tube 7 and the gear 933 is stretched, that is, the driving tube 7 and the gear 933 generate relative rotation. Then the sealing cover 91 is pressed tightly against the junction box 2. Finally, the sealing cover 91 and the junction box 2 are fixedly connected by a set screw to limit the rotation of the sealing cover 91.

[0049] Embodiment 2: The difference from Embodiment 1 is that a sliding hole 100 is provided on the side wall of the sealing cover 91, a U-shaped clamping plate 101 is slidably connected in the sliding hole 100, and a connecting hole 102 for passing the inner rod 935 is provided on the sealing cover 91. A connecting inclined surface 103 is provided on the clamping plate 101, and the upper end of the inner rod 935 is used to abut against the connecting inclined surface 103. The inner rod 935 is provided in a rectangular parallelepiped.

[0050] During the process of rotating the sealing cover 91, the driving tube 7 rotates, and at the same time, relative sliding occurs between the inner rod 935 and the sleeve 934. After the driving tube 7 is tightened, the sealing cover 91 continues to be rotated. At this time, the inner rod 935 passes through the connecting hole 102 and contacts the connecting inclined surface 103, so that the clamping plate 101 moves toward the sealing cover 91 and the six clamping plates 101 are pressed against the outer wall of the upper edge of the junction box 2, so that the sealing cover 91 and the junction box 2 are fixed. At the same time, due to the displacement of the clamping plate 101, the worker can be reminded that the sealing cover 91 has been tightened.

[0051] It is worth mentioning that in this embodiment, the inner rods 935 and the clamping plates 101 are respectively arranged in the six sleeves 934, and the clamping plates 101 are evenly distributed along the edges of the sealing cover 91. Therefore, even when the sealing cover 91 is screwed, if the sealing is not smooth during the tightening process, some of the clamping plates 101 will inevitably fail to be smoothly pressed against the upper edge of the junction box 2, so as to remind the operator to tighten the sealing cover 91 again, and ensure that each sealing cover 91 can be screwed in smoothly, thereby ensuring that the produced motor has high sealing stability.

[0052] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A three-phase asynchronous motor with high sealing performance, comprising a housing (1), a stator being fixedly connected inside the housing (1), a rotor (11) being rotatably connected inside the housing (1), the rotor (11) being located inside the stator, a junction box (2) being fixedly connected to the outer wall of the housing (1), a sealing cover (91) being connected to the opening of the junction box (2), a terminal (21) being fixedly connected to the junction box (2), the terminal (21) being connected to the stator, wherein: The device further comprises a sealing tube (3) made of rubber, wherein the sealing tube (3) is provided with a sealing hole (31) for passing an electric wire (32), wherein the sealing hole (31) and the electric wire (32) are interference fit, wherein a support tube (41) is fixedly connected to the side wall of the junction box (2), wherein the support tube (41) is in communication with the junction box (2), wherein a fixing tube (42) is threadedly connected to the support tube (41), wherein an elastic clamping tube (43) is arranged in the support tube (41), wherein the sealing tube (3) passes through the fixing tube (42), the elastic clamping tube (43) and the support tube (41) and then extends into the junction box (2), wherein the fixing tube (42) rotates in a direction close to the support tube (41) and causes the elastic clamping tube (43) to clamp the sealing tube (3) through a linkage assembly (5).

2. A three-phase asynchronous motor with high sealing performance according to claim 1, characterized in that: The linkage assembly (5) comprises a contact ring (51), a contact slope (52) and an elastic groove (53); the contact slope (52) is arranged on the outer wall of the elastic clamp tube (43); the contact slope (52) is used to contact the inner wall of the support tube (41); a plurality of elastic grooves (53) are arranged on the elastic clamp tube (43) and are connected to the outer wall and the inner wall of the elastic clamp tube (43); the elastic grooves (53) are arranged along the axial direction of the elastic clamp tube (43); the contact ring (51) is fixedly connected to the inner wall of the fixed tube (42) and contacts the end of the elastic clamp tube (43); after the elastic clamp tube (43) and the sealing tube (3) are pressed tightly, the two opposite inner walls of the elastic groove (53) are pressed tightly.

3. A three-phase asynchronous motor with high sealing performance according to claim 2, characterized in that: A connecting block (412) is fixedly connected to the outer wall of the supporting tube (41), a fixing bolt (421) is arranged on the outer wall of the fixing tube (42), and the fixing bolt (421) is threadedly connected to the connecting block (412).

4. The high-sealing three-phase asynchronous motor according to claim 1 is characterized in that: The sealing cover (91) is threadedly connected to the junction box (2); a sealing ring (92) is fixedly connected to the edge of the sealing cover (91); and the sealing ring (92) is tightly pressed against the opening.

5. A three-phase asynchronous motor with high sealing performance according to claim 4, characterized in that: An extension tube (6) is fixedly connected to the inner wall of the junction box (2), a plurality of elastic clamping plates (61) are fixedly connected to the end of the extension tube (6), a drive tube (7) is threadedly connected to the extension tube (6), and the sealing tube (3) passes through the extension tube (6) and the drive tube (7); The driving tube (7) rotates in a direction close to the extension tube (6) and causes the elastic clamping plate (61) to clamp the sealing tube (3) through the conductive structure (8), and then causes two adjacent elastic clamping plates (61) to press against each other.

6. A three-phase asynchronous motor with high sealing performance according to claim 5, characterized in that: The conductive structure (8) comprises a first inclined surface (81), a second inclined surface (82), and a sealing inclined surface (83); the first inclined surface (81) is provided on the elastic clamp (61); the second inclined surface (82) is provided on the inner wall of the driving tube (7) and is used to contact the first inclined surface (81); the sealing inclined surface (83) is provided on the side wall of the elastic clamp (61); and after the elastic clamp (61) is pressed against the sealing tube (3), the adjacent sealing inclined surface (83) is pressed against.

7. The high-sealability three-phase asynchronous motor according to claim 6 is characterized in that: A sealing ring (84) is fixedly connected to the inner wall of the driving tube (7) and is used to tightly abut against the outer wall of the sealing tube (3).

8. A three-phase asynchronous motor with high sealing performance according to claim 5 or 6, characterized in that: During the rotation of the sealing cover (91), the driving tube (7) is caused to rotate synchronously via the connecting structure (93).

9. The high-seal three-phase asynchronous motor according to claim 8, characterized in that: The connection structure (93) comprises a telescopic rod (931), a toothed ring (932), and a gear (933); one end of the telescopic rod (931) is connected to the sealing cover (91); the other end of the telescopic rod (931) is connected to the toothed ring (932); the gear (933) is rotatably connected to the outer wall of the driving tube (7) and is connected to the driving tube (7) via a spring; the toothed ring (932) is meshed with the gear (933).

10. The high-sealing three-phase asynchronous motor according to claim 9, characterized in that: The telescopic rod (931) comprises a sleeve (934) and an inner rod (935); the sleeve (934) is fixed on the sealing cover (91); a plurality of sleeves (934) are evenly distributed along the axis of the sealing cover (91); each sleeve (934) is slidably connected with the inner rod (935); and one end of the inner rod (935) away from the sleeve (934) is fixedly connected to the gear ring (932).

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