Shield pump with impact-resistant bearing sleeve

Abstract

The utility model relates to a shield pump with an anti-impact bearing sleeve, and solves the problems that a motor is cooled by a medium, a rotor is continuously impacted by the medium, and the impact on a bearing is large in the shield pump. The device comprises a cylindrical pump body, a liquid inlet and a liquid outlet are formed in the two ends of the pump body respectively, a driving motor and an impeller driven by the motor are arranged between the liquid inlet and the liquid outlet, the driving motor comprises a stator and a rotor arranged on the inner side of the stator, a rotor shaft is arranged in the center of the rotor, and bearing sleeves are arranged at the two ends of the rotor shaft. The bearing sleeve is a sliding bearing sleeve made of carbon graphite, the outer side of the bearing sleeve is embedded in the bearing seat, and a plurality of annular buffering pieces are arranged between the outer wall of the bearing sleeve and the bearing seat. According to the shield pump disclosed by the utility model, the shaft end of the rotor shaft adopts the carbon graphite bearing sleeve, and the outer side of the bearing sleeve is provided with the plurality of annular buffer pieces, so that the problem of applicability of the carbon graphite bearing sleeve in the shield pump is solved.

Description

Technical Field

[0001] This utility model belongs to the field of water pumps, and relates to a canned pump, particularly a canned pump with an impact-resistant bearing sleeve. Background Technology

[0002] Traditional centrifugal pumps have an impeller installed inside the flow channel, with the impeller shaft extending through the channel wall and connected to a drive motor via a coupling. The drive motor rotates the impeller, generating pumping power. These centrifugal pumps require dynamic sealing at the shaft penetration point, which can easily lead to leakage under prolonged use or high pressure within the flow channel.

[0003] A canned motor pump is a seal-free pump in which both the pump and the drive motor are sealed within a pressure vessel filled with the pumped medium. This pressure vessel has only a static seal, and a rotating magnetic field is provided by an electrical wiring harness to drive the rotor. This structure eliminates the rotating shaft seal device found in traditional centrifugal pumps, thus achieving complete leak-free operation. It is particularly suitable for pumping high-value and polluting media.

[0004] The rotor of a canned motor pump is cooled by the medium in the flow channel. Consequently, the rotor is also subjected to continuous impact from the medium, which places higher demands on the strength of the bearings. As a result, bearings with lower cost and more brittle materials cannot meet the service life requirements. Utility Model Content

[0005] The purpose of this invention is to solve the problem that the rotor of a canned motor is subjected to continuous impact from the medium when the motor is cooled by the medium, resulting in a large impact on the bearing. The invention provides a canned motor with an impact-resistant bearing sleeve. The sliding bearing sleeve made of carbon graphite material has the advantages of good lubrication, good corrosion resistance, and low cost. At the same time, multiple impact-resistant buffers are set on the outside of the bearing sleeve to solve the problem of poor impact resistance and fragility of carbon graphite material.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a shielded pump with an impact-resistant bearing sleeve, including a cylindrical pump body, with an inlet and an outlet respectively provided at both ends of the pump body, a drive motor and a motor-driven impeller provided between the inlet and the outlet, the drive motor including a stator and a rotor provided inside the stator, a rotor shaft provided at the center of the rotor, bearing sleeves provided at both ends of the rotor shaft, the bearing sleeves being sliding bearing sleeves made of carbon graphite, the outer side of the bearing sleeve being embedded in a bearing seat, and several annular buffer members provided between the outer wall of the bearing sleeve and the bearing seat.

[0007] This device uses carbon graphite bearing sleeves, which are sliding bearings with good lubrication, low cost, and good corrosion resistance. However, carbon graphite bearing sleeves are brittle and not impact-resistant, easily breaking under continuous impact. Therefore, traditional canned motor pumps, which use the medium itself as the cooling medium between the rotor and stator, are subject to continuous fluid impact, making carbon graphite bearing sleeves unsuitable. This application uses carbon graphite bearing sleeves at the rotor shaft end and provides multiple annular buffer elements on the outside of the bearing sleeve to cushion and protect it, preventing breakage during prolonged operation. This solves the applicability problem of carbon graphite bearing sleeves in canned motor pumps.

[0008] Preferably, the bearing sleeve has multiple annular grooves on its outer side, and the buffer is embedded in the annular grooves.

[0009] Preferably, one of the annular grooves is located at the junction of the bearing sleeve sidewall and the outer end face, and the buffer protrudes from the outer end face of the bearing sleeve when embedded. Multiple buffers are provided, and the outermost buffer is in a semi-embedded form, that is, it provides buffering for the circumference and also protrudes from the end face of the bearing sleeve to provide buffering for the end face, forming multi-directional protection and avoiding fragile edges and corners of the bearing sleeve where impact stress is concentrated.

[0010] Preferably, the buffer is an elastic rubber ring.

[0011] Preferably, the support structure of the drive motor facing the liquid inlet is as follows: an inlet bracket is provided at the end of the pump body where the liquid inlet is located, the middle of the inlet bracket is the liquid inlet, a bearing seat is provided on the inner side of the inner end of the inlet bracket, and a stator support frame is provided on the outer side of the inner end of the inlet bracket, the stator support frame supports the stator.

[0012] Preferably, the support structure of the drive motor facing the outlet end is as follows: a connecting seat is provided on the inner wall of the pump body, a bearing seat is provided on the inner side of the connecting seat facing the drive motor end, and a stator support frame is provided on the outer side of the connecting seat facing the drive motor end, and the stator support frame supports the stator.

[0013] Preferably, an impeller is connected to one end of the rotor shaft facing the liquid outlet, and a guide vane is provided at the outer end of the impeller, with the liquid outlet located at the outer end of the guide vane.

[0014] Preferably, a stator sleeve is provided on the outer side of the stator.

[0015] Preferably, rotor end rings are provided on both ends of the rotor, and rotor sleeves are fitted on the outer side of the rotor.

[0016] The canned motor pump of this invention uses a carbon graphite bearing sleeve at the end of the rotor shaft, and multiple annular buffers are provided on the outside of the bearing sleeve to buffer and protect the carbon graphite bearing sleeve, preventing the bearing sleeve from breaking after long-term operation, thus solving the applicability problem of carbon graphite bearing sleeves in canned motor pumps. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] In the diagram: 1. Pump body; 2. Inlet; 3. Bearing sleeve; 4. Positioning ring; 5. Rotor; 6. Motor barrel; 7. Impeller; 8. Guide vane; 9. Outlet; 10. Connecting seat; 11. Sealing ring; 12. Rotor shaft; 13. Stator; 14. Rotor sleeve; 15. Rotor end ring; 16. Stator sleeve; 17. Stator support frame; 18. Buffer; 19. Inlet bracket; 20. Outlet bracket; 21. Bearing seat. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0021] Example: A canned pump with an impact-resistant bearing sleeve, such as Figure 1 As shown. This device includes a cylindrical pump body 1, with an inlet 2 and an outlet 9 at each end. A drive motor and a motor-driven impeller 7 are located between the inlet and outlet. The drive motor includes a stator 13 and a rotor 5 disposed inside the stator 13, with a stator sleeve on the outside of the stator. A rotor shaft 12 is located at the center of the rotor 5, and rotor end rings 15 are provided on both ends of the rotor. The rotor end rings 15 are sleeved on the rotor shaft, and a positioning ring 4 is provided at the outer end of the rotor end rings 15 to press and position the rotor end rings 15. The positioning rings and the rotor shaft are interference-fitted, and a sealing ring is embedded in the inner end face of the positioning ring, abutting against the connection between the step of the rotor shaft 5 and the rotor end ring 15. A rotor sleeve 14 is provided on the outer wall of the rotor 5.

[0022] Bearing sleeves 3 are provided at both ends of the rotor shaft 12. The bearing sleeves 3 are sliding bearing sleeves made of carbon graphite. The outer side of the bearing sleeve 3 is embedded in the bearing seat 21. Several annular buffer members 18, which are elastic rubber rings, are provided between the outer wall of the bearing sleeve 21 and the bearing seat. Multiple annular grooves are opened on the outer side of the bearing sleeve 3, and the buffer members 18 are embedded in the annular grooves. One of the annular grooves is opened at the junction of the side wall and the outer end face of the bearing sleeve, and the buffer member 18 protrudes from the outer end face of the bearing sleeve 3 when it is embedded.

[0023] like Figure 1As shown, the support structure for the drive motor facing the inlet 2 is as follows: an inlet bracket 19 is provided at one end of the pump body 1 where the inlet is located, with the inlet 2 at the middle. A bearing seat 21 is provided on the inner side of the inner end of the inlet bracket 19, and a stator support frame 17 is provided on the outer side of the inner end of the inlet bracket. The stator support frame 17 supports the end face of the stator 13. The support structure for the drive motor facing the outlet is as follows: a connecting seat 10 is provided on the inner wall of the pump body. A bearing seat 21 is provided on the inner side of the connecting seat facing the drive motor, and a stator support frame 17 is provided on the outer side of the connecting seat facing the drive motor. The stator support frame supports the other end face of the stator.

[0024] If so Figure 1 As shown, an impeller 7 is connected to one end of the rotor shaft facing the outlet 9. A guide vane 8 is provided at the outer end of the impeller. The outlet 9 is located at the outer end of the guide vane and is opened on the outlet bracket 20 of the pump body 1.

[0025] The canned motor pump uses a carbon graphite bearing sleeve at the end of the rotor shaft, and multiple annular buffers are set on the outside of the bearing sleeve. This can buffer and protect the circumferential and end faces of the carbon graphite bearing sleeve, preventing the bearing sleeve from breaking after long-term operation, thus solving the applicability problem of carbon graphite bearing sleeves in canned motor pumps.

Claims

1. A shielded pump with an impact-resistant bearing sleeve, comprising a cylindrical pump body, an inlet and an outlet respectively provided at both ends of the pump body, and a drive motor and a motor-driven impeller disposed between the inlet and the outlet, characterized in that: The drive motor includes a stator and a rotor disposed inside the stator. A rotor shaft is disposed at the center of the rotor, and bearing sleeves are disposed at both ends of the rotor shaft. The bearing sleeves are sliding bearing sleeves made of carbon graphite. The outer side of the bearing sleeve is embedded in a bearing seat, and several annular buffer members are disposed between the outer wall of the bearing sleeve and the bearing seat.

2. A shielded pump with an impact-resistant bearing sleeve according to claim 1, characterized in that: Multiple annular grooves are formed on the outer side of the bearing sleeve, and the buffer is embedded in the annular grooves.

3. A shielded pump with an impact-resistant bearing sleeve according to claim 2, characterized in that: One of the annular grooves is located at the junction of the bearing sleeve sidewall and the outer end face, and the buffer protrudes from the outer end face of the bearing sleeve when it is installed.

4. A shielded pump with an impact-resistant bearing sleeve according to claim 1, characterized in that: The buffer is an elastic rubber ring.

5. A shielded pump with an impact-resistant bearing sleeve according to claim 1, characterized in that: The support structure of the drive motor facing the liquid inlet is as follows: the pump body has an inlet bracket at the end where the liquid inlet is located, the middle of the inlet bracket is the liquid inlet, a bearing seat is provided on the inner side of the inner end of the inlet bracket, and a stator support frame is provided on the outer side of the inner end of the inlet bracket, the stator support frame supports the stator.

6. A shielded pump with an impact-resistant bearing sleeve according to claim 1 or 5, characterized in that: The support structure of the drive motor facing the outlet end is as follows: a connecting seat is provided on the inner wall of the pump body, a bearing seat is provided on the inner side of the connecting seat facing the drive motor end, and a stator support frame is provided on the outer side of the connecting seat facing the drive motor end, and the stator support frame supports the stator.

7. A shielded pump with an impact-resistant bearing sleeve according to claim 1, 2, 3, 4, or 5, characterized in that: An impeller is connected to one end of the rotor shaft facing the liquid outlet, and a guide vane is provided at the outer end of the impeller. The liquid outlet is located at the outer end of the guide vane.

8. A shielded pump with an impact-resistant bearing sleeve according to claim 1, 2, 3, 4, or 5, characterized in that: The stator is provided with a stator sleeve on the outside.

9. A shielded pump with an impact-resistant bearing sleeve according to claim 1, 2, 3, 4, or 5, characterized in that: The rotor has rotor end rings on both ends, and a rotor sleeve is fitted on the outside of the rotor.

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