Mounting structure of motor shaft of shield pump

Abstract

The utility model belongs to the technical field of shield pumps, and relates to a mounting structure of a motor shaft of a shield pump, which comprises a shield sleeve, a front bearing seat and a rear bearing seat, a front bearing is arranged in the front bearing seat, a rear bearing is arranged in the rear bearing seat, the motor shaft is assembled in the front bearing and the rear bearing, a dynamic limit component is sleeved at the front end of the motor shaft, and the shield sleeve is sleeved at the rear end of the motor shaft. The dynamic limiting assembly comprises a wear-resisting gasket and a special-shaped check ring, the wear-resisting gasket is located on the outer side of the front bearing seat, the special-shaped check ring is located on the outer side of the wear-resisting gasket and forms an axial limiting structure of the wear-resisting gasket, and a gap is reserved between the wear-resisting gasket and the outer end face of the front bearing seat when the shield pump works. And when the motor shaft moves backwards, the wear-resistant gasket is in abutting connection with the outer end face of the front bearing seat to form an axial limiting structure. The installation structure of the motor shaft of the shield pump can prevent faults of the shield pump caused by over-limit movement of the motor shaft.

Description

Technical Field

[0001] The utility model belongs to the technical field of shielded pumps and relates to a mounting structure for a shielded pump motor shaft. Background Art

[0002] The shielded pump connects the pump and the motor together. The rotor of the motor and the impeller of the pump are fixed on the same shaft. The rotor and the stator of the motor are separated by a shielding sleeve. The rotor rotates in the medium being transported, and its power is transmitted to the rotor through the stator magnetic field.

[0003] Since the rotor and impeller of the shielded pump are fixed on the motor shaft, when the shielded pump is working normally, the motor shaft will be subjected to the forward axial force generated by the impeller. When the shielded pump stops running, the axial force is small, and the motor shaft will move backward, which may cause damage to the shielded pump in serious cases. In order to solve this problem, the technicians install an axial limit assembly on the motor shaft to prevent the motor shaft from moving, but the axial limit assembly will produce friction with other components such as the bearing seat, affecting the normal operation of the shielded pump. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a mounting structure for a motor shaft of a shielded pump, which can prevent the shielded pump from malfunctioning due to excessive movement of the motor shaft.

[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0006] A mounting structure for a shielded pump motor shaft comprises a shielding sleeve, a front bearing seat and a rear bearing seat, wherein a stator is arranged on the outer side of the shielding sleeve and a rotor is arranged on the inner side, a motor shaft is passed through the rotor, a front bearing is arranged in the front bearing seat, a rear bearing is arranged in the rear bearing seat, the motor shaft is assembled in the front bearing and the rear bearing, a dynamic limit assembly is mounted on the front end of the motor shaft, the dynamic limit assembly comprises a wear-resistant gasket and a special-shaped retaining ring, the wear-resistant gasket is located on the outer side of the front bearing seat, the special-shaped retaining ring is located on the outer side of the wear-resistant gasket and forms an axial limit structure of the wear-resistant gasket, when the shielded pump is working, a gap is left between the wear-resistant gasket and the outer end face of the front bearing seat, when the motor shaft moves backward, the wear-resistant gasket contacts and connects with the outer end face of the front bearing seat and forms an axial limit structure.

[0007] In the above-mentioned installation structure of the shielded pump motor shaft, a limiting shoulder for installing a wear-resistant gasket and a limiting groove for installing a special-shaped retaining ring are respectively provided on the motor shaft. The limiting shoulder is located on the outer side of the front bearing seat, and the limiting groove is located on the outer side of the limiting shoulder. The special-shaped retaining ring is abutted and connected with the outer end face of the wear-resistant gasket to form an axial limiting structure.

[0008] In the above-mentioned installation structure of the motor shaft of a shielded pump, the special-shaped retaining ring includes an open ring body, and a plurality of claws cooperating with the limiting grooves are arranged on the inner side of the open ring body.

[0009] In the above-mentioned installation structure of the motor shaft of a shielded pump, preferably, the special-shaped retaining ring is made of elastic metal material, and preferably, the wear-resistant gasket is made of tetrafluoroethylene gasket.

[0010] In the above-mentioned canned pump motor shaft installation structure, the wear-resistant gasket and the special-shaped retaining ring have the same outer diameter, and the inner diameter of the wear-resistant gasket is larger than that of the special-shaped retaining ring. Further, the inner diameter of the open ring body is larger than that of the wear-resistant gasket.

[0011] In the above-mentioned installation structure of the shielded pump motor shaft, the front bearing and the rear bearing are both ceramic bearings, the motor shaft is provided with a front friction groove and a rear friction groove, the front friction groove and the rear friction groove are provided with a tungsten steel coating, and the front bearing and the rear bearing form a sliding friction pair with the tungsten steel coating of the front friction groove and the rear friction groove respectively.

[0012] In the above-mentioned shielded pump motor shaft installation structure, the front end of the motor shaft is provided with a thrust bearing, the thrust bearing is located at the rear side of the front bearing and frictionally connected thereto, and a positioning shoulder for installing the thrust bearing is provided on the motor shaft.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model provides an installation structure for a shielded pump motor shaft, and a dynamic limit assembly is added to the motor shaft, including a wear-resistant gasket and a special-shaped retaining ring for axially limiting the wear-resistant gasket. When the shielded pump works normally, the motor shaft is subjected to a forward axial force, and a gap is left between the wear-resistant gasket and the outer end surface of the front bearing seat. The limit assembly will not affect the operation of the shielded pump. When the shielded pump is shut down, the motor shaft moves backward, and the wear-resistant gasket conflicts with the front bearing seat and limits its movement distance, thereby avoiding damage to the shielded pump.

[0015] 2. The utility model further optimizes the installation structure of the motor shaft. The front and rear bearings adopt a combination of ceramic bearings and tungsten steel coatings, which greatly increases the wear resistance of the motor shaft and the service life of the shielded pump. On this basis, the utility model can further reduce the installation accessories of the motor shaft, and does not need to use a sleeve and a rear thrust bearing, thereby shortening the axial size of the motor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the utility model;

[0017] Figure 2It is a stereogram of the assembly of the dynamic limit assembly of the utility model;

[0018] Figure 3 This is the front view of the motor shaft of the utility model;

[0019] Figure numerals: 1. shielding sleeve; 2. front bearing seat; 3. rear bearing seat; 4. rotor; 5. motor shaft; 6. front bearing; 7. rear bearing; 8. wear-resistant gasket; 9. special-shaped retaining ring; 10. limiting shoulder; 11. limiting groove; 12. front friction groove; 13. rear friction groove; 14. thrust bearing; 15. positioning shoulder. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings. Figure 1-3 :

[0021] A mounting structure for a shielded pump motor shaft comprises a shielding sleeve 1, a front bearing seat 2 and a rear bearing seat 3, wherein a stator is arranged on the outer side of the shielding sleeve 1 and a rotor 4 is arranged on the inner side, a motor shaft 5 is passed through the rotor 4, a front bearing 6 is arranged in the front bearing seat 2, a rear bearing 7 is arranged in the rear bearing seat 3, the motor shaft 5 is assembled in the front bearing 6 and the rear bearing 7, a dynamic limit assembly is sleeved on the front end of the motor shaft 5, the dynamic limit assembly comprises a wear-resistant gasket 8 and a special-shaped retaining ring 9, the wear-resistant gasket 8 is located on the outer side of the front bearing seat 2, the special-shaped retaining ring is located on the outer side of the wear-resistant gasket 8 and forms an axial limit structure of the wear-resistant gasket 8, when the shielded pump is working, a gap is left between the wear-resistant gasket 8 and the outer end face of the front bearing seat 2, when the motor shaft 5 moves backward, the wear-resistant gasket 8 is abutted and connected with the outer end face of the front bearing seat 2 and forms an axial limit structure.

[0022] When the shielded pump is working normally, the rotor 4, the motor shaft 5 and the impeller rotate synchronously, the motor shaft 5 is subjected to the forward axial force, the wear-resistant gasket 8 and the special-shaped retaining ring 9 rotate synchronously with the motor shaft 5, and the gap between the wear-resistant gasket 8 and the outer end face of the front bearing seat 2 makes the wear-resistant gasket 8 not contact the front bearing seat 2, and the two do not produce friction, so it will not affect the operation of the shielded pump. When the shielded pump is turned off, the motor shaft 5 moves backward, the wear-resistant gasket 8 and the special-shaped retaining ring 9 produce synchronous axial displacement with the motor shaft 5, and the wear-resistant gasket 8 moves in the direction of the front bearing seat 2 until it conflicts with it. When the wear-resistant gasket 8 conflicts with the outer end face of the front bearing seat 2, the axial limit structure of the motor shaft 5 is formed, and the movement of the motor shaft 5 stops. When the shielded pump is restarted, the wear-resistant gasket 8 rotates again with the motor shaft 5 and rubs against the outer end face of the front bearing seat 2, but as the speed of the motor shaft 5 increases, the wear-resistant gasket 8 leaves the outer end face of the front bearing seat 2 again after a short friction until it reaches a stable working position.

[0023] Compare with Figure 2 and attached Figure 3The specific installation structure of the wear-resistant gasket 8 and the special-shaped retaining ring is: the motor shaft 5 is respectively provided with a limiting shoulder 10 for installing the wear-resistant gasket 8 and a limiting groove 11 for installing the special-shaped retaining ring, the limiting shoulder 10 is located on the outer side of the front bearing seat 2, and the limiting groove 11 is located on the outer side of the limiting shoulder 10, and the special-shaped retaining ring is in contact with the outer end surface of the wear-resistant gasket 8 to form an axial limiting structure.

[0024] In this embodiment, the structure of the special-shaped retaining ring is as follows: the special-shaped retaining ring comprises an open ring body, and a plurality of claws cooperating with the limiting groove 11 are arranged on the inner side of the open ring body.

[0025] Preferably, the special-shaped retaining ring 9 is made of elastic metal material, and preferably, the wear-resistant gasket 8 is made of tetrafluoroethylene gasket.

[0026] Furthermore, the wear-resistant gasket 8 and the special-shaped retaining ring have the same outer diameter, the inner diameter of the wear-resistant gasket 8 is larger than the inner diameter of the special-shaped retaining ring, and the inner diameter of the open ring body is larger than the inner diameter of the wear-resistant gasket 8 .

[0027] In order to improve the wear resistance of the rotating structure of the motor shaft 5, the structure of the motor shaft 5 can be simplified: the front bearing 6 and the rear bearing 7 are both ceramic bearings, the motor shaft 5 is provided with a front friction groove 12 and a rear friction groove 13, the front friction groove 12 and the rear friction groove 13 are provided with a tungsten steel coating, and the front bearing 6 and the rear bearing 7 form a sliding friction pair with the tungsten steel coating of the front friction groove 12 and the rear friction groove 13 respectively.

[0028] Furthermore, a thrust bearing 14 is mounted on the front end of the motor shaft 5 . The thrust bearing 14 is located at the rear side of the front bearing 6 and is frictionally connected thereto. A positioning shoulder 15 for mounting the thrust bearing 14 is provided on the motor shaft 5 .

[0029] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A canned pump motor shaft installation structure, comprising a ... wherein the canned pump motor shaft installation structure, wherein the canned pump motor shaft installation structure, wherein the canned pump motor shaft installation structure, wherein the canned pump motor shaft installation structure, wherein the can The front end of the motor shaft (5) is provided with a dynamic limit assembly, and the dynamic limit assembly includes a wear-resistant gasket (8) and a special-shaped retaining ring (9). The wear-resistant gasket (8) is located on the outside of the front bearing seat (2), and the special-shaped retaining ring (9) is located on the outside of the wear-resistant gasket (8) and forms an axial limit structure of the wear-resistant gasket (8). When the shielded pump is working, a gap is left between the wear-resistant gasket (8) and the outer end surface of the front bearing seat (2). When the motor shaft (5) moves backward, the wear-resistant gasket (8) and the outer end surface of the front bearing seat (2) are in contact with each other and form an axial limit structure.

2. The installation structure of a canned motor pump shaft according to claim 1, characterized in that: The motor shaft (5) is provided with a limiting shoulder (10) for installing a wear-resistant gasket (8) and a limiting groove (11) for installing a special-shaped retaining ring (9), respectively; the limiting shoulder (10) is located on the outer side of the front bearing seat (2), the limiting groove (11) is located on the outer side of the limiting shoulder (10), and the special-shaped retaining ring (9) is in contact with the outer end surface of the wear-resistant gasket (8) to form an axial limiting structure.

3. The installation structure of the motor shaft of a canned motor pump according to claim 2, characterized in that: The special-shaped retaining ring (9) comprises an open ring body, and a plurality of claws cooperating with the limiting grooves (11) are arranged on the inner side of the open ring body.

4. The installation structure of the motor shaft of a canned motor pump according to claim 2, characterized in that: The wear-resistant gasket (8) and the special-shaped retaining ring (9) have the same outer diameter, and the inner diameter of the wear-resistant gasket (8) is greater than the inner diameter of the special-shaped retaining ring (9).

5. The installation structure of the motor shaft of a canned motor pump according to claim 1, characterized in that: The front bearing (6) and the rear bearing (7) are both ceramic bearings. The motor shaft (5) is provided with a front friction groove (12) and a rear friction groove (13). Tungsten steel coatings are provided at the front friction groove (12) and the rear friction groove (13). The front bearing (6) and the rear bearing (7) respectively form a sliding friction pair with the tungsten steel coatings of the front friction groove (12) and the rear friction groove (13).

6. The installation structure of the motor shaft of a canned motor pump according to claim 5, characterized in that: The front end of the motor shaft (5) is sleeved with a thrust bearing (14), the thrust bearing (14) is located on the rear side of the front bearing (6) and is frictionally connected thereto, and a positioning shoulder (15) for mounting the thrust bearing (14) is provided on the motor shaft (5).

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