A shielded pump with dynamic balance and no leakage structure

Abstract

The application discloses a shielding pump with a dynamic balance and a non-leakage structure, wherein a leakage prevention structure is arranged at a fixing position of an outer ring shielding cover and a motor shell front cover, and a dynamic balance structure is arranged at a fixing position of an inner ring shielding cover and an end ring; the leakage prevention structure adopts a multistage buffer groove structure, and the dynamic balance structure adopts an elastic sealing balance structure; the leakage prevention structure comprises a front cover sealing sleeve in a "]" structure, the front cover sealing sleeve is fixed across two sides of a first step surface of the front cover, one end of the front cover sealing sleeve is fixedly connected with an inner side surface of the front cover through bolts, and the other end of the front cover sealing sleeve is connected with a second step surface of the front cover through a static sealing belt; and the inner ring shielding cover is provided with a radial inner ring shielding cover sealing part and an axial inner ring shielding cover cross sealing part which are sequentially connected at both ends of the inner ring shielding cover.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, and more specifically to a shielded pump with a dynamic balance and leak-free structure. Background Technology

[0002] A canned motor pump seals both the motor and the pump within a completely enclosed housing. A shield isolates the stator windings and rotor from the pumping medium. If the shield cracks or perforates, the internal medium can become contaminated with the motor cavity or leak to the outside, leading to short circuits in the motor windings, motor burnout, bearing seizure, rotor lock-up, and other problems. A malfunction causing a shutdown will halt the entire production line, with losses far exceeding the cost of repairing the pump itself.

[0003] The balance of a canned motor pump is essential for its long-term, stable, and quiet operation. Balance primarily refers to the dynamic balance of the rotor components, but also involves hydraulic balance and axial force balance. Any imbalance can lead to serious consequences. Once the rotor becomes significantly unbalanced, it will no longer rotate uniformly around its centerline, but will generate eccentric forces, causing rotor vibration and radial runout. The direct consequences are wear on the shielding cover and bearings, increased vibration and noise, increased energy consumption, and decreased performance.

[0004] However, existing canned pumps have design limitations, involving only the design of some non-universal structures without fundamentally changing the relevant structure. They are not adaptable, have poor stability, high surge, high noise, and low efficiency. Therefore, in order to address these problems, the applicant proposes a canned pump with a dynamic balance and leak-free structure to solve the above-mentioned problems, reduce leakage, and improve balance. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a shielded pump with a dynamic balance and leak-free structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A canned motor with a dynamic balance and leak-free structure includes a pump and a canned motor connected to the pump. The pump includes an inlet section, a pump body, a front guide wheel, an impeller, a rear cover, and a pump shaft, which are installed and connected in sequence. The canned motor includes an inner rotor assembly and an outer stator assembly. The front end of the canned motor is connected to the rear cover of the pump via a front cover of the motor housing. The pump and the canned motor are connected by a front bearing seat, a front bearing, a front shaft sleeve, and a front thrust disc. The rear end of the canned motor is fixedly connected by a rear cover of the motor housing, a rear bearing seat, a rear bearing, a rear shaft sleeve, and a rear thrust disc. A circulation channel is provided at the center of the pump shaft. An inner ring shield is fixedly installed on the outer side of the inner rotor assembly, and an outer ring shield is fixedly installed on the inner side of the outer stator assembly. End rings are fixedly installed at both ends of the inner rotor assembly. The feature is that an anti-leakage structure is provided at the fixing point between the outer ring shield and the front cover of the motor housing, and a dynamic balancing structure is provided at the fixing point between the inner ring shield and the end rings. The anti-leakage structure adopts a multi-stage buffer groove structure, and the dynamic balancing structure adopts an elastic sealing balancing structure.

[0008] Furthermore, the front cover of the motor housing includes an inner side surface of the front cover, a first step surface of the front cover, a second step surface of the front cover, and a third step surface of the front cover connected in sequence; the anti-leakage structure includes a front cover sealing sleeve in the shape of "]", the front cover sealing sleeve is fixed across both sides of the first step surface of the front cover, one end of which is fixedly connected to the inner side surface of the front cover with bolts, and the other end of which is connected to the second step surface of the front cover with a static sealing strip.

[0009] Furthermore, there is a first buffer cavity between the front cover sealing sleeve and the first step surface of the front cover.

[0010] Furthermore, the outer ring shield is provided with a radial outer ring shield sealing part and an axial outer ring shield step part connected in sequence at both ends; the radial outer ring shield sealing part is provided with multiple sealing ring grooves with trapezoidal cross sections, and the free end of the axial outer ring shield step part is connected to the third step surface of the front cover by a static sealing strip.

[0011] Furthermore, the leak-proof structure also includes a Y-shaped sealing ring, which is fixedly connected to the radial side of the front cover sealing sleeve. The forked end of the Y-shaped sealing ring is fixed in the sealing ring groove, and the small cross-section end of the sealing ring groove is close to the axial center of the outer ring shield.

[0012] Furthermore, a second buffer cavity is provided between the outer ring shield and the front cover sealing sleeve.

[0013] Furthermore, an adjusting screw is provided between the outer ring shield and the front cover sealing sleeve. The adjusting screw is used to adjust the tightness of the fit between the forked end of the Y-shaped sealing ring and the sealing ring groove.

[0014] Furthermore, the end of the end ring connected to the inner ring shield is provided with a first end ring protrusion, a first end ring step, a first end ring groove, a second end ring step, and a second end ring protrusion connected in sequence; the two ends of the inner ring shield are provided with a radial inner ring shield sealing part and an axial inner ring shield cross sealing part connected in sequence; a multi-dimensional compensation ring is provided between the radial inner ring shield sealing part and the first end ring protrusion.

[0015] Furthermore, the axial outer free end of the cross seal of the axial inner ring shield is connected to the groove of the first end ring by a dynamic sealing strip.

[0016] Furthermore, the two radially outer free ends of the cross seal of the axial inner ring shield are connected to the first end ring step and the second end ring step respectively by a dynamic sealing strip.

[0017] Furthermore, a first buffer spring and a second buffer spring are provided between the cross-shaped sealing part of the axial inner ring shield and the first end ring protrusion and the second end ring protrusion.

[0018] Furthermore, a third buffer cavity exists between the end ring and the inner ring shield; a first buffer spring is disposed in the third buffer cavity; wherein the stiffness coefficient K1 of the first buffer spring is greater than the stiffness coefficient K2 of the second buffer spring.

[0019] This invention discloses a canned pump with a dynamically balanced, leak-free structure. The outer ring shield is fixed to the front cover of the motor housing with a leak-proof structure, and the inner ring shield is fixed to the end ring with a dynamic balancing structure. The leak-proof structure employs a multi-stage buffer groove structure, and the dynamic balancing structure employs an elastic sealing balancing structure. The leak-proof structure includes a front cover sealing sleeve in a "]" shape, which spans both sides of the first step surface of the front cover and is fixed. One end of the sealing sleeve is bolted to the inner side of the front cover, and the other end is connected to the second step surface of the front cover using a static sealing strip. The outer ring shield has radially connected outer ring shield sealing portions and axially connected outer ring shield step portions at both ends. The radially connected outer ring shield sealing portions have multiple trapezoidal sealing ring grooves, and the free end of the axially connected outer ring shield step portion is connected to the third step surface of the front cover using a static sealing strip. The leak-proof structure also includes a Y-shaped sealing ring, which is fixedly connected to the radial side of the front cover sealing sleeve. The forked end of the Y-shaped sealing ring is fixed within the sealing ring groove, and the smaller cross-section end of the sealing ring groove is close to the axial center of the outer ring shield. One end of the end ring connected to the inner ring shield has a first end ring protrusion, a first end ring step, a first end ring groove, a second end ring step, and a second end ring protrusion connected in sequence. Both ends of the inner ring shield have a radial inner ring shield sealing part and an axial inner ring shield cross sealing part connected in sequence. A multi-dimensional compensation ring is provided between the radial inner ring shield sealing part and the first end ring protrusion. A third buffer cavity exists between the end ring and the inner ring shield; a first buffer spring is disposed in the third buffer cavity; wherein the stiffness coefficient K1 of the first buffer spring is greater than the stiffness coefficient K2 of the second buffer spring. Due to the improved structure of the shield, leakage is reduced and the balance is greatly improved. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the axial cross-sectional structure of an existing canned motor pump;

[0021] Figure 2 for Figure 1 Enlarged schematic diagram of the improved anti-leakage structure 23;

[0022] Figure 3 for Figure 1 An enlarged schematic diagram of the improved dynamic balancing structure 24.

[0023] In the diagram: 1. Inlet section; 2. Pump body; 3. Front guide wheel; 4. Impeller; 5. Pump rear cover; 6. Pump shaft; 7. Front cover of motor housing; 71. Inner side of front cover; 72. First step surface of front cover; 73. Second step surface of front cover; 74. Third step surface of front cover; 8. Rear cover of motor housing; 9. Front bearing seat; 10. Rear bearing seat; 11. Front bearing; 12. Rear bearing; 13. Circulation channel; 14. Front shaft sleeve; 15. Rear shaft sleeve; 16. Front thrust plate; 17. Rear thrust plate; 18. Inner ring shield; 18. Radial inner ring shield seal; 181. Axial inner ring shield cross seal; 182. Multidimensional compensation ring; 184. Outer ring shield; 19. Radial outer ring shield seal; 191. Shaft. Outer ring shield step portion 192, inner ring rotor assembly 20, outer ring stator assembly 21, end ring 22, anti-leakage structure 23, front cover sealing sleeve 231, Y-type sealing ring 232, first buffer chamber 233, second buffer chamber 234, adjusting screw 235, dynamic balancing structure 24, first end ring protrusion 241, first end ring step portion 242, first end ring groove portion 243, second end ring step portion 244, second end ring protrusion 245, first buffer spring 246, second buffer spring 247, third buffer chamber 248, stiffness coefficient K1 of the first buffer spring 246, and stiffness coefficient K2 of the second buffer spring 247. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings.

[0026] like Figure 1-3As shown, a canned motor pump with a dynamic balance and leak-free structure includes a pump and a canned motor connected to the pump. The pump includes an inlet section 1, a pump body 2, a front guide wheel 3, an impeller 4, a rear cover 5, and a pump shaft 6, which are installed and connected in sequence. The canned motor includes an inner rotor assembly 20 and an outer stator assembly 21. The front end of the canned motor is connected to the rear cover 5 of the pump via a front cover 7 of the motor housing. The pump and the canned motor are connected by a front bearing seat 9, a front bearing 11, a front shaft sleeve 14, and a front thrust plate 16. The rear end of the canned motor is connected by a rear cover 8 of the motor housing, a rear bearing seat 10, a rear bearing 12, and a rear shaft sleeve 15. The rear thrust disc 17 is fixedly connected to the transmission; the pump shaft 6 has a circulation channel 13; an inner ring shield 18 is fixedly installed on the outer side of the inner ring rotor assembly 20, and an outer ring shield 19 is fixedly installed on the inner side of the outer ring stator assembly 21; end rings 22 are fixedly installed at both ends of the inner ring rotor assembly 20; the feature is that: a leakage prevention structure 23 is provided at the fixing point between the outer ring shield 19 and the front cover 7 of the motor housing, and a dynamic balancing structure 24 is provided at the fixing point between the inner ring shield 18 and the end ring 22; wherein the leakage prevention structure 23 adopts a multi-stage buffer groove structure, and the dynamic balancing structure 24 adopts an elastic sealing balancing structure.

[0027] When the outer ring shield 19 fails to be fixed to the front cover 7 of the motor housing, the arrangement of the multi-stage buffer groove structure effectively reduces the risk of the working medium seeping into the outer ring stator assembly 21; when the rotor is eccentric and unbalanced, the arrangement of the elastic sealing balance structure effectively adjusts the deformation structure, so that the rotor can achieve self-balancing effect as soon as possible.

[0028] Furthermore, the front cover 7 of the motor housing includes an inner front cover surface 71, a first front cover step surface 72, a second front cover step surface 73, and a third front cover step surface 74 connected in sequence; the anti-leakage structure 23 includes a front cover sealing sleeve 231 in the shape of "]", the front cover sealing sleeve 231 is fixed across both sides of the first front cover step surface 72, one end of which is bolted to the inner front cover surface 71, and the other end of which is connected to the second front cover step surface 73 by a static sealing strip.

[0029] Furthermore, a first buffer cavity 233 exists between the front cover sealing sleeve 231 and the first step surface 72 of the front cover.

[0030] Furthermore, the outer ring shield 19 is provided with a radial outer ring shield sealing part 191 and an axial outer ring shield step part 192 connected in sequence at both ends; the radial outer ring shield sealing part 191 is provided with a plurality of sealing ring grooves with trapezoidal cross sections, and the free end of the axial outer ring shield step part 192 is connected to the third step surface 74 of the front cover by a static sealing strip.

[0031] Furthermore, the leak-proof structure 23 also includes a Y-shaped sealing ring 232, which is fixedly connected to the radial side of the front cover sealing sleeve 231. The forked end of the Y-shaped sealing ring 232 is fixed in the sealing ring groove, and the small cross-section end of the sealing ring groove is close to the axial center of the outer ring shield 19.

[0032] Furthermore, a second buffer cavity 234 is provided between the outer ring shield 19 and the front cover sealing sleeve 231.

[0033] Furthermore, an adjusting screw 235 is provided between the outer ring shield 19 and the front cover sealing sleeve 231. The adjusting screw 235 is used to adjust the tightness of the fit between the forked end of the Y-shaped sealing ring 232 and the sealing ring groove.

[0034] The forked end of the Y-shaped sealing ring 232 is fixed in the sealing ring groove, and the tightness of the fit is adjusted by adjusting the adjusting screw 235. The above structure effectively improves the sealing performance of the outer ring shield 19, and facilitates maintenance and replacement when excessive wear occurs.

[0035] Furthermore, the end of the end ring 22 connected to the inner ring shield 18 is provided with a first end ring protrusion 241, a first end ring step 242, a first end ring groove 243, a second end ring step 244, and a second end ring protrusion 245 connected in sequence; the two ends of the inner ring shield 18 are provided with a radial inner ring shield sealing part 181 and an axial inner ring shield cross sealing part 182 connected in sequence; a multi-dimensional compensation ring 184 is provided between the radial inner ring shield sealing part 181 and the first end ring protrusion 241.

[0036] Furthermore, the axial outer free end of the axial inner ring shield cross seal 182 is connected to the first end ring groove 243 by a dynamic sealing strip.

[0037] Furthermore, the two radially outer free ends of the axial inner ring shield cross seal 182 are connected to the first end ring step 242 and the second end ring step 244 respectively by using dynamic sealing strips.

[0038] The use of the axial inner ring shield cross seal 182 and the end ring 22 to achieve multi-stage high-efficiency sealing means that even if there is leakage of the working medium when the rotor is self-balancing, it will only exist in the buffer cavity.

[0039] Furthermore, a first buffer spring 246 and a second buffer spring 247 are provided between the cross-shaped sealing part 182 of the axial inner ring shield and the first end ring protrusion 241 and the second end ring protrusion 245.

[0040] Furthermore, a third buffer cavity 248 exists between the end ring 22 and the inner ring shield 18; a first buffer spring 246 is disposed in the third buffer cavity 248; wherein the stiffness coefficient K1 of the first buffer spring 246 is greater than the stiffness coefficient K2 of the second buffer spring 247.

[0041] Springs have efficient recovery performance, and the dynamic balancing structure 24 can more easily achieve self-balancing performance by using springs. The stiffness coefficient K1 of the first buffer spring 246 is greater than the stiffness coefficient K2 of the second buffer spring 247, which effectively avoids the excessive influence of the working medium on the dynamic balancing structure 24. This structure greatly increases the conveying efficiency, reduces vibration and noise, and improves stability and compactness.

[0042] This invention discloses a canned pump with a dynamically balanced, leak-free structure. The outer ring shield is fixed to the front cover of the motor housing with a leak-proof structure, and the inner ring shield is fixed to the end ring with a dynamic balancing structure. The leak-proof structure employs a multi-stage buffer groove structure, and the dynamic balancing structure employs an elastic sealing balancing structure. The leak-proof structure includes a front cover sealing sleeve in a "]" shape, which spans both sides of the first step surface of the front cover and is fixed. One end of the sealing sleeve is bolted to the inner side of the front cover, and the other end is connected to the second step surface of the front cover using a static sealing strip. The outer ring shield has radially connected outer ring shield sealing portions and axially connected outer ring shield step portions at both ends. The radially connected outer ring shield sealing portions have multiple trapezoidal sealing ring grooves, and the free end of the axially connected outer ring shield step portion is connected to the third step surface of the front cover using a static sealing strip. The leak-proof structure also includes a Y-shaped sealing ring, which is fixedly connected to the radial side of the front cover sealing sleeve. The forked end of the Y-shaped sealing ring is fixed within the sealing ring groove, and the smaller cross-section end of the sealing ring groove is close to the axial center of the outer ring shield. One end of the end ring connected to the inner ring shield has a first end ring protrusion, a first end ring step, a first end ring groove, a second end ring step, and a second end ring protrusion connected in sequence. Both ends of the inner ring shield have a radial inner ring shield sealing part and an axial inner ring shield cross sealing part connected in sequence. A multi-dimensional compensation ring is provided between the radial inner ring shield sealing part and the first end ring protrusion. A third buffer cavity exists between the end ring and the inner ring shield; a first buffer spring is disposed in the third buffer cavity; wherein the stiffness coefficient K1 of the first buffer spring is greater than the stiffness coefficient K2 of the second buffer spring. Due to the improved structure of the shield, leakage is reduced and the balance is greatly improved.

Claims

1. A canned motor with a dynamic balance and leak-free structure, comprising a pump and a canned motor connected to the pump; the pump comprises an inlet section (1), a pump body (2), a front guide wheel (3), an impeller (4), a pump rear cover (5), and a pump shaft (6) installed in sequence; the canned motor comprises an inner rotor assembly (20) and an outer stator assembly (21), the front end of the canned motor is connected to the pump rear cover (5) through a motor housing front cover (7), and the pump and the canned motor are connected by a front bearing seat (9), a front bearing (11), and a front bushing (14). The front thrust disc (16) is connected by transmission, and the rear end of the shielded motor is fixedly connected by transmission through the rear cover (8) of the motor housing (8), the rear bearing seat (10), the rear bearing (12), the rear bushing (15), and the rear thrust disc (17); the pump shaft (6) is provided with a circulation channel (13); an inner ring shield (18) is fixedly installed on the outer side of the inner ring rotor assembly (20), and an outer ring shield (19) is fixedly installed on the inner side of the outer ring stator assembly (21); end rings (22) are fixedly installed at both ends of the inner ring rotor assembly (20); the feature is that: A leak-proof structure (23) is provided at the fixing point between the outer ring shield (19) and the front cover (7) of the motor housing, and a dynamic balancing structure (24) is provided at the fixing point between the inner ring shield (18) and the end ring (22); wherein the leak-proof structure (23) adopts a multi-stage buffer groove structure, and the dynamic balancing structure (24) adopts an elastic sealing balancing structure; the front cover (7) of the motor housing includes the front cover inner side surface (71), the front cover first step surface (72), the front cover second step surface (73), and the front cover third step surface (74) connected in sequence. The stepped surface (74) and the anti-leakage structure (23) include a front cover sealing sleeve (231) in the shape of "]". The front cover sealing sleeve (231) is fixed across both sides of the first stepped surface (72) of the front cover. One end of the sleeve is bolted to the inner side (71) of the front cover, and the other end is connected to the second stepped surface (73) of the front cover by a static sealing strip. There is a first buffer cavity (233) between the front cover sealing sleeve (231) and the first stepped surface (72) of the front cover. The outer ring shield (19) is provided with a retaining wall at both ends. The radial outer ring shield sealing part (191) and the axial outer ring shield stepped part (192) are connected in the secondary connection. The radial outer ring shield sealing part (191) is provided with multiple sealing ring grooves with trapezoidal cross sections. The free end of the axial outer ring shield stepped part (192) is connected to the third step surface (74) of the front cover by a static sealing strip. The anti-leakage structure (23) also includes a Y-type sealing ring (232), which is fixedly connected to the radial side of the front cover sealing sleeve (231). The forked end of the Y-shaped sealing ring (232) is fixed in the sealing ring groove, and the small cross-section end of the sealing ring groove is close to the axial center of the outer ring shield (19); a second buffer cavity (234) is provided between the outer ring shield (19) and the front cover sealing sleeve (231); an adjusting screw (235) is provided between the outer ring shield (19) and the front cover sealing sleeve (231), and the adjusting screw (235) is used to adjust the tightness of the fit between the forked end of the Y-shaped sealing ring (232) and the sealing ring groove.

2. The shielded pump with a dynamic balance and leak-free structure as described in claim 1, characterized in that, The end of the end ring (22) connected to the inner ring shield (18) is provided with a first end ring protrusion (241), a first end ring step (242), a first end ring groove (243), a second end ring step (244), and a second end ring protrusion (245) connected in sequence; the two ends of the inner ring shield (18) are provided with a radial inner ring shield sealing part (181) and an axial inner ring shield cross sealing part (182) connected in sequence; a multi-dimensional compensation ring (184) is provided between the radial inner ring shield sealing part (181) and the first end ring protrusion (241).

3. The shielded pump with a dynamic balance and leak-free structure as described in claim 2, characterized in that, The axial outer free end of the axial inner ring shield cross seal (182) is connected to the first end ring groove (243) by a dynamic sealing strip.

4. The shielded pump with a dynamic balance and leak-free structure as described in claim 3, characterized in that, The two radially outer free ends of the cross seal part (182) of the axial inner ring shield are connected to the first end ring step part (242) and the second end ring step part (244) respectively by using dynamic sealing strips.

5. The shielded pump with a dynamic balance and leak-free structure as described in claim 4, characterized in that, A first buffer spring (246) and a second buffer spring (247) are provided between the cross seal part (182) of the axial inner ring shield and the first end ring protrusion (241) and the second end ring protrusion (245).

6. The shielded pump with a dynamic balance and leak-free structure as described in claim 5, characterized in that, There is a third buffer cavity (248) between the end ring (22) and the inner ring shield (18); the first buffer spring (246) is disposed in the third buffer cavity (248); wherein the stiffness coefficient K1 of the first buffer spring (246) is greater than the stiffness coefficient K2 of the second buffer spring (247).

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