Shield pump convenient to maintain

Abstract

The utility model relates to a shield pump convenient to maintain, and solves the problems that a rotor assembly of a traditional shield pump adopts an integrated structure and needs to be integrally replaced when being locally damaged, and the maintenance cost is high. A stator assembly of a driving motor and a rotor assembly arranged on the inner side of the stator assembly are arranged between a liquid inlet and a liquid outlet of a pump body of the device, the rotor assembly comprises a rotor shaft and a rotor iron core, the rotor shaft is a step shaft, and the rotor iron core is arranged on the outer side of a middle step, with the largest outer diameter, of the rotor shaft in a sleeving mode. Rotor end rings are arranged at the two ends of the rotor iron core respectively, the outer end faces of the rotor end rings are flush with the step face of the middle-section step of the rotor shaft, positioning rings are arranged at the outer ends of the rotor end rings, the positioning rings abut against the rotor end rings and the step face of the middle-section step, and the positioning rings are in interference fit with the rotor shaft. According to the utility model, when the rotor assembly is locally damaged, the rotor iron core and the rotor shaft can be detached for local replacement, so that the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of water pumps, and relates to a canned motor pump, and in particular to a canned motor pump that is easy to maintain. 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] Because the drive motor of a canned motor pump is built-in and both the stator and rotor are placed in the medium, the rotor and electronics are encapsulated. The rotor assembly of a traditional canned motor pump includes a rotor core and a rotor shaft passing through the center of the rotor core. Magnets are attached around the circumference of the rotor core, and a rotor sleeve is set on the outside of the magnets to isolate them from the medium. The rotor core and rotor shaft are usually fixed as a whole by welding or other means and cannot be disassembled. However, the rotor assembly of a canned motor pump is constantly impacted by the medium and is likely to be damaged. Once the rotor assembly is damaged, the entire rotor assembly needs to be replaced, resulting in high maintenance costs. Utility Model Content

[0005] The purpose of this invention is to solve the problem that the rotor assembly of traditional canned motor pumps adopts an integrated structure, which requires the entire assembly to be replaced when a part is damaged, resulting in high maintenance costs. The invention provides a canned motor pump that is easy to maintain, which adopts an assembled rotor core and rotor shaft. The rotor core end face is sealed by a rotor end ring and positioned and supported by a positioning ring, forming a detachable assembly. When the rotor assembly is partially damaged, the rotor can be partially replaced, saving maintenance costs.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a shielded pump that is easy to maintain, including a cylindrical pump body, with an inlet and an outlet respectively provided at both ends of the pump body, and a drive motor and a motor-driven impeller provided between the inlet and the outlet. The drive motor includes a stator assembly and a rotor assembly provided inside the stator assembly. The rotor assembly includes a rotor shaft and a rotor core. The rotor shaft is a stepped shaft, and the rotor core is sleeved on the outer side of the middle step with the largest outer diameter of the rotor shaft. Rotor end rings are provided at both ends of the rotor core. The outer end face of the rotor end ring is flush with the step surface of the middle step of the rotor shaft. A positioning ring is provided at the outer end of the rotor end ring. The positioning ring abuts against the rotor end ring and the step surface of the middle step. The positioning ring is interference-fitted with the rotor shaft.

[0007] The rotor core and rotor shaft of this device adopt a detachable structure. When partial damage occurs to the rotor assembly, the rotor core and rotor shaft can be disassembled and replaced locally, reducing maintenance costs. The rotor core is sleeved on the outside of the middle step of the rotor shaft. The ends are closed and positioned by rotor end rings and positioning rings in sequence. The positioning rings adopt an interference fit to prevent axial movement.

[0008] Preferably, the inner end face of the positioning ring is provided with a sealing groove, and a sealing ring is embedded in the sealing groove. The sealing ring is aligned with the joint between the rotor end ring and the step in the middle section of the rotor shaft. The canned motor pump uses a pumping medium for water cooling. The medium of the canned motor pump will impact the rotor, especially during start-up and shutdown, which will generate a large water hammer impact, causing the rotor core to be subjected to axial impact force. The sealing ring structure on the inner side of the positioning ring can not only seal the joint position, but also buffer the axial force on the rotor core, preventing the positioning ring from being axially displaced by the axial force on the rotor core.

[0009] Preferably, the rotor core is uniformly covered with magnet sheets around its circumference.

[0010] Preferably, the circumference of the rotor end ring is flush with the outer surface of the magnet sheet.

[0011] Preferably, a rotor sleeve is provided on the outer side of the rotor assembly in the circumferential direction.

[0012] Preferably, the sum of the thicknesses of the rotor core and the rotor end rings at both ends is consistent with the length of the middle step of the rotor shaft.

[0013] The rotor core and rotor shaft of the shielded pump rotor assembly of this utility model adopt a detachable structure. When the rotor assembly is partially damaged, the rotor core and rotor shaft can be disassembled and partially replaced, reducing maintenance costs. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] In the diagram: 1. Pump body; 2. Inlet; 3. Bearing sleeve; 4. Positioning ring; 5. Rotor core; 6. Motor cylinder; 7. Impeller; 8. Guide vane; 9. Outlet; 10. Connecting seat; 11. Sealing ring; 12. Rotor shaft; 13. Stator assembly; 14. Rotor sleeve; 15. Rotor end ring; 16. Stator sleeve; 17. Stator support frame; 18. Buffer component; 19. Inlet bracket; 20. Outlet bracket; 21. Bearing seat; 22. Magnet plate. Detailed Implementation

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

[0018] 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 assembly 13 and a rotor assembly located inside the stator assembly 13. A stator sleeve 16 is located outside the stator assembly 13. The rotor assembly includes a rotor shaft 12 and a rotor core 5. The rotor shaft 12 is a stepped shaft. The rotor core 5 is sleeved outside the middle step of the rotor shaft 12, which has the largest outer diameter. Rotor end rings 15 are provided at both ends of the rotor core. The sum of the thickness of the rotor core and the two rotor end rings is the same as the length of the middle step of the rotor shaft. The outer end face of the rotor end ring 15 is flush with the step surface of the middle step of the rotor shaft 12. A positioning ring 4 is provided at the outer end of the rotor end ring 15. The positioning ring abuts against the rotor end ring and the step surface of the middle step, and the positioning ring is interference-fitted with the rotor shaft. The inner end face of the positioning ring 4 is provided with a sealing groove, and a sealing ring 11 is embedded in the sealing groove. The sealing ring 11 is aligned with the joint between the rotor end ring 15 and the middle step of the rotor shaft 12. Magnets 22 are evenly attached to the circumference of the rotor core 5, and the circumference of the rotor end ring 15 is flush with the outer surface of the magnets 22. A rotor sleeve 14 is provided on the outer wall of the rotor assembly.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] The rotor core and rotor shaft of the shielded pump rotor assembly of this utility model adopt a detachable structure. When the rotor assembly is partially damaged, the rotor core and rotor shaft can be disassembled and partially replaced, reducing maintenance costs.

Claims

1. A canned motor pump that is easy to maintain, comprising a cylindrical pump body, with 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 assembly and a rotor assembly disposed inside the stator assembly. The rotor assembly includes a rotor shaft and a rotor core. The rotor shaft is a stepped shaft. The rotor core is sleeved on the outer side of the middle step with the largest outer diameter of the rotor shaft. Rotor end rings are respectively provided at both ends of the rotor core. The outer end face of the rotor end ring is flush with the step surface of the middle step of the rotor shaft. A positioning ring is provided at the outer end of the rotor end ring. The positioning ring abuts against the rotor end ring and the step surface of the middle step. The positioning ring is interference-fitted with the rotor shaft.

2. The easily maintainable canned pump according to claim 1, characterized in that: The inner end face of the positioning ring is provided with a sealing groove, and a sealing ring is embedded in the sealing groove. The sealing ring is aligned with the joint between the rotor end ring and the middle step of the rotor shaft.

3. The easily maintainable canned pump according to claim 1, characterized in that: The rotor core is uniformly covered with magnetic steel sheets around its circumference.

4. The easily maintainable canned pump according to claim 3, characterized in that: The circumference of the rotor end ring is flush with the outer surface of the magnet sheet.

5. A canned motor pump that is easy to maintain according to claim 3 or 4, characterized in that: A rotor sleeve is provided on the outer side of the rotor assembly in the circumferential direction.

6. A canned motor pump that is easy to maintain according to claim 3 or 4, characterized in that: The sum of the thickness of the rotor core and the thickness of the rotor end rings at both ends is consistent with the length of the middle step of the rotor shaft.

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