A canned pump bearing axial positioning structure

Abstract

This application relates to an axial positioning structure for a canned motor pump bearing, comprising a bearing, a thrust sleeve, and a positioning sleeve. The bearing is fixed to the front end cover of the canned motor pump, and the thrust sleeve is fitted and fixed to the rotor shaft of the canned motor pump, with the bearing sleeve fitted outside the thrust sleeve. The positioning sleeve is fitted onto the rotor shaft of the canned motor pump, and an impeller is fixedly mounted on the rotor shaft. The impeller presses the positioning sleeve axially against the thrust sleeve. This application, by fitting the positioning sleeve onto the rotor shaft of the canned motor pump and then mounting the impeller on the rotor shaft, effectively solves the problem of axial movement of the thrust sleeve, thereby reducing vibration during operation.

Description

Technical Field

[0001] This application relates to the technical field of canned motor pump components, and in particular to an axial positioning structure for a canned motor pump bearing. Background Technology

[0002] A canned motor pump is a sealed assembly of a canned motor and a pump, which has the unique advantage of being leak-free. It is used to transport flammable, explosive, corrosive, highly toxic, and valuable liquids, and is widely used in petroleum, chemical, aerospace, pharmaceutical, textile, and other fields.

[0003] Currently, Chinese patent application number 2022106178017 discloses a shielded vortex pump, including a pump body, a stator shield sleeve fixedly installed in the middle of the pump body, a front bearing seat fixedly installed in the shaft head chamber of the pump body, a front bearing fixedly installed in the middle of the front bearing seat, and a front shaft sleeve fixedly installed in the inner ring of the front bearing.

[0004] The axial positioning structure of the front axle sleeve generally uses a shaft elastic retaining ring for fixing. However, the shaft elastic retaining ring often has gaps in actual assembly, which cannot effectively fix the front axle sleeve and easily causes axial movement of the front axle sleeve, increasing vibration and other effects during the operation of the whole machine. Therefore, there are certain areas for improvement. Utility Model Content

[0005] To reduce vibration during operation, this application provides an axial positioning structure for a canned pump bearing.

[0006] The axial positioning structure for a canned pump bearing provided in this application adopts the following technical solution:

[0007] An axial positioning structure for a canned motor pump bearing includes a bearing, a thrust sleeve, and a positioning sleeve. The bearing is fixed to the front end cover of the canned motor pump. The thrust sleeve is sleeved and fixed to the rotor shaft of the canned motor pump, and the bearing is sleeved outside the thrust sleeve. The positioning sleeve is sleeved on the rotor shaft of the canned motor pump, and an impeller is fixedly installed on the rotor shaft of the canned motor pump. The impeller presses the positioning sleeve axially against the thrust sleeve.

[0008] Preferably, a sealing ring is housed on the end face of the positioning sleeve, and the sealing ring is pressed between the positioning sleeve and the thrust bushing.

[0009] Preferably, the positioning sleeve has an anti-detachment edge, which extends toward the thrust bushing, and the sealing ring is housed inside the anti-detachment edge.

[0010] Preferably, the rotor shaft of the shielded pump is provided with a front axial shoulder that abuts against the positioning sleeve.

[0011] Preferably, the thrust bushing includes a bushing ring and a thrust disc integrally formed on the bushing ring. The bushing ring is sleeved on the rotor shaft of the canned pump, the bushing ring is housed in the bearing, and the thrust disc is opposite to the end face of the bearing.

[0012] Preferably, the thrust disc is covered by a mounting sleeve, which is fixed to the rotor shaft of the canned pump by fastening bolts, and the thrust disc is fixed to the mounting sleeve by fixing bolts.

[0013] Preferably, the rotor shaft of the canned pump is provided with a rear axial shoulder that abuts against the mounting sleeve.

[0014] Preferably, the rotor shaft end of the canned pump is provided with a threaded section, and a locking nut for locking the impeller is threadedly connected to the threaded section.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] This application involves attaching a positioning sleeve to the rotor shaft of a canned motor pump, and then installing an impeller on the rotor shaft of the canned motor pump. The impeller presses the positioning sleeve axially against the thrust sleeve. This method of installing the thrust sleeve can effectively solve the problem of axial movement of the thrust sleeve, thereby reducing vibration during operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a canned motor pump.

[0018] Figure 2 This is a schematic diagram of the installation of the bearing axial positioning structure.

[0019] Explanation of reference numerals in the attached drawings: 1. Pump body; 2. Motor housing; 21. Motor outer casing; 22. Front cover; 23. Rear cover; 3. Rotor shaft; 4. Shielding sleeve; 5. Impeller; 6. Bearing axial positioning structure; 61. Bearing; 62. Thrust sleeve; 621. Shaft sleeve ring; 622. Thrust disc; 623. Mounting sleeve; 624. Fastening bolt; 63. Positioning sleeve; 64. Mounting position; 65. Screw; 66. Sealing ring; 67. Anti-detachment edge; 7. Stator; 8. Rotor; 9. Flow port; 10. Liquid inlet; 11. Return port; 12. Rear axial shoulder; 13. Front axial shoulder; 14. Threaded section; 15. Locking nut. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0021] An axial positioning structure for a canned pump bearing, as shown in the reference. Figure 1 and Figure 2As shown, the bearing axial positioning structure 6 is applied in a canned motor pump. The canned motor pump includes a pump body 1, a motor housing 2, a rotor shaft 3, a shielding sleeve 4, and an impeller 5. The motor housing 2 includes a motor housing 21 and a front cover 22 and a rear cover 23 disposed at both ends of the motor housing 21. The shielding sleeve 4 is disposed inside the motor housing 21, and its two ends are respectively mounted on the front cover 22 and the rear cover 23. The rotor shaft 3 is disposed inside the shielding sleeve 4. The first end of the rotor shaft 3 is connected to the front cover 22 through the bearing axial positioning structure 6, and the end of the rotor shaft 3 is mounted on the rear cover 23 through the bearing structure.

[0022] A stator 7 is installed inside the motor housing 21, and a rotor 8 is installed on the rotor shaft 3. The pump body 1 is connected to the front cover 22, and the impeller 5 is installed inside the pump body 1 and mounted on the end of the rotor shaft 3. A flow port 9 passes through the rotor shaft 3 along its axial direction. An inlet 10 is provided on the front cover 22, and a return port 11 is provided on the rear cover 23. The conveying medium in the pump body 1 enters the shielding sleeve 4 through the inlet 10, and then flows back into the pump body 1 through the return port 11 and the flow port 9, thereby completing the circulation of the conveying medium in the shielded pump.

[0023] Reference Figure 2 As shown, the axial positioning structure 6 of bearing 61 includes bearing 61, thrust bushing 62 and positioning sleeve 63. Bearing 61 is fixed on the front end cover 22 of the shielded pump. A mounting position 64 is provided in the middle of the front end cover 22. Bearing 61 is embedded in the mounting position 64. A mounting groove is provided on the side wall of bearing 61. Screw 65 passes through the mounting position 64 and is locked in the mounting groove, thereby fixing bearing 61 in the mounting position 64 of the front end cover 22.

[0024] A thrust sleeve 62 is fitted and fixed onto the rotor shaft 3 of the canned motor pump, and a bearing 61 is fitted over the thrust sleeve 62. The thrust sleeve 62 includes a sleeve ring 621 and a thrust disc 622 integrally formed on the sleeve ring 621. The sleeve ring 621 is fitted onto the rotor shaft 3 and housed within the bearing 61. The thrust disc 622 faces the end face of the bearing 61. A mounting sleeve 623 covers the thrust disc 622 and is fixed to the rotor shaft 3 of the canned motor pump by fastening bolts 624. The thrust disc 622 is fixed to the mounting sleeve 623 by fixing bolts (not shown in the figure). The rotor shaft 3 of the canned motor pump has a rear axial shoulder 12 that abuts against the mounting sleeve 623.

[0025] The positioning sleeve 63 is fitted onto the rotor shaft 3 of the canned pump. The rotor shaft 3 is provided with a front axial shoulder 13 that abuts against the positioning sleeve 63. A sealing ring 66 is housed on the end face of the positioning sleeve 63. The sealing ring 66 is pressed between the positioning sleeve 63 and the thrust sleeve 62. The edge of the positioning sleeve 63 is provided with an anti-detachment edge 67, which extends toward the thrust sleeve 62. The sealing ring 66 is housed inside the anti-detachment edge 67.

[0026] An impeller 5 is fixedly installed on the rotor shaft 3 of the canned pump. The impeller 5 presses the positioning sleeve 63 axially onto the thrust sleeve 62. A threaded section 14 is provided at the end of the rotor shaft 3. A locking nut 15 for locking the impeller 5 is threaded onto the threaded section 14.

[0027] This application involves fitting a positioning sleeve 63 onto the rotor shaft 3 of a canned motor pump, then mounting an impeller 5 onto the rotor shaft 3, and threading a locking nut 15 onto the threaded section 14 to lock the impeller 5 onto the rotor shaft 3. The impeller 5 approaches and presses against the positioning sleeve 63, thereby pressing the positioning sleeve 63 axially onto the thrust sleeve 62. The sealing ring 66 is pressed between the positioning sleeve 63 and the thrust sleeve 62.

[0028] This method of installing the thrust bushing 62 can effectively solve the problem of axial movement of the thrust bushing 62, thereby reducing vibration during operation.

[0029] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An axial positioning structure for a canned motor pump bearing, characterized in that, Includes a bearing (61), a thrust bushing (62), and a positioning sleeve (63). The bearing (61) is fixed on the front end cover (22) of the shielded pump, and the thrust bushing (62) is sleeved and fixed on the rotor shaft (3) of the shielded pump. The bearing (61) is sleeved outside the thrust bushing (62). The positioning sleeve (63) is fitted onto the rotor shaft (3) of the shielded pump. An impeller (5) is fixedly installed on the rotor shaft (3) of the shielded pump. The impeller (5) presses the positioning sleeve (63) axially onto the thrust sleeve (62).

2. The axial positioning structure for a canned pump bearing according to claim 1, characterized in that, A sealing ring (66) is housed on the end face of the positioning sleeve (63), and the sealing ring (66) is pressed between the positioning sleeve (63) and the thrust bushing (62).

3. The axial positioning structure for a canned pump bearing according to claim 2, characterized in that, The positioning sleeve (63) has an anti-detachment edge (67) on its edge, the anti-detachment edge (67) extends toward the thrust bushing (62) and the sealing ring (66) is housed inside the anti-detachment edge (67).

4. The axial positioning structure for a canned pump bearing according to claim 2, characterized in that, The rotor shaft (3) of the canned pump is provided with a front axial shoulder (13) that abuts against the positioning sleeve (63).

5. The axial positioning structure for a canned pump bearing according to claim 1, characterized in that, The thrust bushing (62) includes a bushing ring (621) and a thrust disc (622) integrally formed on the bushing ring (621). The bushing ring (621) is sleeved on the rotor shaft (3) of the shielded pump. The bushing ring (621) is housed in the bearing (61). The thrust disc (622) is opposite to the end face of the bearing (61).

6. The axial positioning structure for a canned pump bearing according to claim 5, characterized in that, The thrust plate (622) is covered by an mounting sleeve (623), which is fixed to the rotor shaft (3) of the shielded pump by fastening bolts (624), and the thrust plate (622) is fixed to the mounting sleeve (623) by fixing bolts.

7. The axial positioning structure for a canned pump bearing according to claim 6, characterized in that, The rotor shaft (3) of the canned pump is provided with a rear axial shoulder (12) that abuts against the mounting sleeve (623).

8. The axial positioning structure for a canned pump bearing according to claim 1, characterized in that, The rotor shaft (3) of the canned pump is provided with a threaded section (14) at the end, and a locking nut (15) for locking the impeller (5) is threadedly connected to the threaded section (14).

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