Shield pump stator with non-metal shielding sleeve

Abstract

The utility model discloses a shield pump stator with a non-metal shielding sleeve, which belongs to the technical field of shield pump motors and comprises a metal shell, one end of the metal shell is fixedly sleeved with a front flange, the other end of the metal shell is fixedly sleeved with a rear flange, one end of the rear flange is provided with a sealing cover mechanism, and the other end of the rear flange is provided with a non-metal shielding sleeve. Limiting ring grooves are formed in the end faces of the front flange and the rear flange. According to the utility model, the outer non-metal shielding sleeve is sleeved on the inner sides of the metal shell, the front flange and the rear flange, the inner non-metal shielding sleeve is sleeved on the inner side of the outer non-metal shielding sleeve, and the high-temperature-resistant ceramic coating is arranged on the inner wall of the inner non-metal shielding sleeve. The wear resistance of the inner non-metal shielding sleeve and the outer non-metal shielding sleeve is greatly improved through the high-temperature-resistant ceramic coating, the influence of particles in fluid on the inner non-metal shielding sleeve and the outer non-metal shielding sleeve is effectively avoided, the service life of the motor is prolonged, and good practicability is achieved.

Description

Technical Field

[0001] This utility model relates to the field of canned pump motor technology, and more specifically, to a canned pump stator with a non-metallic shielding sleeve. Background Technology

[0002] A conventional centrifugal pump is driven by a coupling that connects the pump's impeller shaft to the motor shaft, causing the impeller and motor to rotate together. A canned motor pump, however, is a seal-less pump. 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 wiring harness provides the rotating magnetic field to drive the rotor. This structure eliminates the rotating shaft seal found in traditional centrifugal pumps, thus achieving complete leak-free operation.

[0003] A search revealed that utility model patent CN204794576U discloses a non-metallic shielded pump motor, comprising a front flange, a rear flange, a stator, a coil, a non-metallic shielding sleeve, and protruding locking pins. The stator is connected to the coil at both ends. The non-metallic shielding sleeve is located inside the stator and coil, with protruding locking pins at both ends that engage with the front and rear flanges. The non-metallic shielding sleeve is injection molded using polytetrafluoroethylene (PTFE) material, forming a completely sealed cavity around the stator. The beneficial effects of this patent include a 10% increase in efficiency, good energy saving, reduced heat transfer, prevention of bearing dry friction due to medium vaporization, significant reduction in material costs, and suitability for strong acid-resistant conditions.

[0004] However, the aforementioned patents have the following shortcomings: the structure is only suitable for use in environments with good operating conditions. Under harsh operating conditions, such as when the medium being pumped contains particles, it is not suitable. Prolonged friction between particles and the shielding sleeve can cause damage to the PTFE shielding sleeve, ultimately leading to leakage and allowing the pumped liquid to enter the motor cavity, damaging the coils. Therefore, we propose a shielded pump stator with a non-metallic shielding sleeve. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a shielded pump stator with a non-metallic shielding sleeve.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A shielded pump stator with a non-metallic shielding sleeve includes a metal outer shell. A front flange is fixedly sleeved at one end of the metal outer shell, and a rear flange is fixedly sleeved at the other end of the metal outer shell. A sealing mechanism is provided at one end of the rear flange. Limiting annular grooves are formed on the end faces of both the front and rear flanges. A rotating groove is formed in the middle of both the front and rear flanges. A pressing and fixing groove is formed at one end of the rear flange. An outer non-metallic shielding sleeve is sleeved between the front and rear flanges. A retaining seat is provided at both ends of the outer non-metallic shielding sleeve. The ends of the two retaining seats are movably sleeved into the inner cavities of the two limiting annular grooves. The outer non-metallic shielding sleeve has extension sleeves at both ends, and the ends of the two extension sleeves are movably fitted into the inner cavities of two rotating slots. The inner wall of the outer non-metallic shielding sleeve is provided with multiple retaining strips. The inner cavity of the outer non-metallic shielding sleeve is fitted with an inner non-metallic shielding sleeve. The outer side of the inner non-metallic shielding sleeve is provided with a retaining groove. The ends of the retaining strips are movably fitted into the inner cavities of the retaining grooves. The ends of the inner non-metallic shielding sleeve extend into the inner cavity of the compression fixing groove and are fixedly connected to a fixing plate. The stator winding is fitted on the outer side of the outer non-metallic shielding sleeve and in the inner cavity of the metal shell. The inner wall of the inner non-metallic shielding sleeve is provided with a high-temperature resistant ceramic coating.

[0008] As a preferred embodiment of this utility model, the sealing mechanism includes multiple screw holes formed on the end face of the rear flange and a shaft seal cover placed at the end of the rear flange. The shaft seal cover has multiple mounting holes, and bolts are fitted into the inner cavities of the multiple mounting holes. The ends of the bolts are threaded into the inner cavities of the screw holes. A pressure block is provided on the inner side of the shaft seal cover. The end of the pressure block extends into the inner cavity of the compression fixing groove and fits against the end face of the fixing plate. A shaft seal seat is fixedly connected to the end of the pressure block. The end of the shaft seal seat extends into the inner cavity of the high-temperature resistant ceramic coating.

[0009] As a preferred embodiment of this utility model, the outer non-metallic shielding sleeve is provided with two reinforcing sleeves on its outer side. The inner walls of the two reinforcing sleeves are in contact with the outer surface of the outer non-metallic shielding sleeve. One end of the two reinforcing sleeves is in contact with both ends of the stator winding, and the other end of the two reinforcing sleeves is in contact with the end faces of the front flange and the rear flange, respectively.

[0010] As a preferred embodiment of this utility model, the end face of the front flange is provided with a front fixing ring groove, the end face of the rear flange is provided with a rear fixing ring groove, one end of the metal shell is fixedly sleeved into the inner cavity of the front fixing ring groove, and the other end of the metal shell is fixedly sleeved into the inner cavity of the rear fixing ring groove.

[0011] In a preferred embodiment of this utility model, the outer side of the extension sleeve is fitted with the inner wall of the rotating groove.

[0012] In a preferred embodiment of this utility model, the inner wall of the outer non-metallic shielding sleeve and the outer side of the inner non-metallic shielding sleeve are fitted together, and the outer side of the card strip and the inner wall of the card slot are fitted together.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] (1) In this utility model, an outer non-metallic shielding sleeve is fitted inside the metal shell, the front flange and the rear flange, and an inner non-metallic shielding sleeve is fitted inside the outer non-metallic shielding sleeve. A high-temperature resistant ceramic coating is provided on the inner wall of the inner non-metallic shielding sleeve. The high-temperature resistant ceramic coating greatly improves the wear resistance of the inner and outer non-metallic shielding sleeves, effectively avoids the influence of particles in the fluid on the inner and outer non-metallic shielding sleeves, improves the motor life, and at the same time prevents the fluid from entering the motor cavity where the stator winding is located. Moreover, the high-temperature resistant ceramic coating can be operated with ordinary spraying equipment, without the need for expensive supersonic spraying equipment, which is simple to operate and improves its practicality.

[0015] (2) In this utility model, the inner non-metallic shielding sleeve and the fixed plate are fixed in the outer non-metallic shielding sleeve by the shaft seal cover, mounting hole and bolt. When the high temperature resistant ceramic coating on the inner side of the inner non-metallic shielding sleeve is worn, the shaft seal cover can be removed to take out the inner non-metallic shielding sleeve, and the high temperature resistant ceramic coating can be re-sprayed on the inner side of the inner non-metallic shielding sleeve for use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is the left view of the exploded view of the overall structure of this utility model;

[0018] Figure 3 This is the right view of the exploded view of the overall structure of this utility model;

[0019] Figure 4 This is a schematic cross-sectional view of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the shaft seal cover of this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the inner non-metallic shielding sleeve of this utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the outer non-metallic shielding sleeve of this utility model;

[0023] Figure 8 This is a cross-sectional view of the rear flange of this utility model.

[0024] Explanation of the labels in the diagram:

[0025] 1. Metal casing; 2. Front flange; 3. Rear flange; 4. Rotating groove; 5. Press-fit groove; 6. Covering mechanism; 7. Limiting ring groove; 8. Outer non-metallic shielding sleeve; 9. Card holder; 10. Extension sleeve; 11. Card strip; 12. Inner non-metallic shielding sleeve; 13. Card slot; 14. Fixing plate; 15. High-temperature resistant ceramic coating; 16. Shaft seal cover; 17. Mounting hole; 18. Screw hole; 19. Bolt; 20. Pressure block; 21. Shaft seal seat; 22. Stator winding; 23. Reinforcing sleeve; 24. Front fixing ring groove; 25. Rear fixing ring groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Example:

[0030] Please see Figure 1-8A shielded pump stator with a non-metallic shielding sleeve includes a metal outer shell 1. A front flange 2 is fixedly sleeved at one end of the metal outer shell 1, and a rear flange 3 is fixedly sleeved at the other end of the metal outer shell 1. A sealing mechanism 6 is provided at one end of the rear flange 3. Limiting annular grooves 7 are formed on the end faces of both the front flange 2 and the rear flange 3. A rotating groove 4 is formed in the middle of both the front flange 2 and the rear flange 3. A pressing and fixing groove 5 is formed at one end of the rear flange 3. An outer non-metallic shielding sleeve 8 is sleeved between the front flange 2 and the rear flange 3. A retaining seat 9 is provided at both ends of the outer non-metallic shielding sleeve 8. The ends of the two retaining seats 9 are movably sleeved into the inner cavities of the two limiting annular grooves 7. Each end is provided with an extension sleeve 10, and the ends of the two extension sleeves 10 are respectively movably sleeved into the inner cavity of the two rotating grooves 4. The inner wall of the outer non-metallic shielding sleeve 8 is provided with multiple retaining strips 11. The inner cavity of the outer non-metallic shielding sleeve 8 is fitted with an inner non-metallic shielding sleeve 12. The outer side of the inner non-metallic shielding sleeve 12 is provided with a retaining groove 13. The ends of the retaining strips 11 are movably sleeved into the inner cavity of the retaining groove 13. The ends of the inner non-metallic shielding sleeve 12 extend into the inner cavity of the compression fixing groove 5 and are fixedly connected to a fixing plate 14. The outer side of the outer non-metallic shielding sleeve 8 and the inner cavity of the metal shell 1 are fitted with a stator winding 22. The inner wall of the inner non-metallic shielding sleeve 12 is provided with a high-temperature resistant ceramic coating 15.

[0031] In this embodiment, the thickness of the high-temperature resistant ceramic coating 15 is in the range of 0.3mm to 0.6mm, which can completely isolate the stator winding 22 from the pump conveying medium. The coating has a temperature resistance of up to 600℃, strong adhesion, high resistivity, high dielectric constant, and is a non-metallic material. No eddy current loss will be generated on the surface when the motor is running. The high-temperature resistant ceramic coating 15 can effectively resist wear and can effectively protect the motor when the conveying medium contains particles, thereby improving the wear resistance of the non-metallic shielding sleeve 12 inside the motor and increasing the service life of the motor.

[0032] For details, please refer to Figures 1 to 5 The sealing mechanism 6 includes multiple screw holes 18 opened on the end face of the rear flange 3 and a shaft seal cover 16 placed at the end of the rear flange 3. Multiple mounting holes 17 are opened on the shaft seal cover 16. Bolts 19 are fitted into the inner cavities of the multiple mounting holes 17. The ends of the bolts 19 are threaded into the inner cavities of the screw holes 18. A pressure block 20 is provided on the inner side of the shaft seal cover 16. The end of the pressure block 20 extends into the inner cavity of the compression fixing groove 5 and fits against the end face of the fixing plate 14. A shaft seal seat 21 is fixedly connected to the end of the pressure block 20. The end of the shaft seal seat 21 extends into the inner cavity of the high-temperature resistant ceramic coating 15.

[0033] In this embodiment, the shaft seal cover 16 is installed by the cooperation of the mounting hole 17, screw hole 18 and bolt 19, so that the pressure block 20 squeezes the fixing plate 14 in the fixing groove 5, thereby fixing the fixing plate 14 and the inner non-metallic shielding sleeve 12.

[0034] For details, please refer to Figure 4 Two reinforcing sleeves 23 are fitted on the outer side of the outer non-metallic shielding sleeve 8. The inner walls of the two reinforcing sleeves 23 are in contact with the outer surface of the outer non-metallic shielding sleeve 8. One end of the two reinforcing sleeves 23 is in contact with both ends of the stator winding 22, and the other end of the two reinforcing sleeves 23 is in contact with the end faces of the front flange 2 and the rear flange 3, respectively.

[0035] In this embodiment, the reinforcing sleeve 23 is used to support the outer non-metallic shielding sleeve 8.

[0036] For details, please refer to Figure 2 and Figure 3 The front flange 2 has a front fixing ring groove 24 on its end face, and the rear flange 3 has a rear fixing ring groove 25 on its end face. One end of the metal shell 1 is fixedly sleeved into the inner cavity of the front fixing ring groove 24, and the other end of the metal shell 1 is fixedly sleeved into the inner cavity of the rear fixing ring groove 25.

[0037] In this embodiment, the two ends of the metal shell 1 are connected by the front fixing ring groove 24 and the rear fixing ring groove 25 to ensure that the metal shell 1 and the front fixing ring groove 24 and the rear fixing ring groove 25 can be sealed and welded.

[0038] For details, please refer to Figure 2 , Figure 7 and Figure 8 The outer side of the extension sleeve 10 fits against the inner wall of the rotating groove 4.

[0039] In this embodiment, the sealing between the extension sleeve 10 and the rotating groove 4 is ensured.

[0040] For details, please refer to Figures 2 to 7 The inner wall of the outer non-metallic shielding sleeve 8 and the outer side of the inner non-metallic shielding sleeve 12 are in contact with each other, and the outer side of the card strip 11 and the inner wall of the card slot 13 are in contact with each other.

[0041] In this embodiment, the sealing between the inner non-metallic shielding sleeve 12 and the outer non-metallic shielding sleeve 8 is ensured, while the sealing and stability between the clip 11 and the slot 13 are also ensured, thereby fixing the inner non-metallic shielding sleeve 12 and the outer non-metallic shielding sleeve 8.

[0042] Working principle: In use, firstly, the stator winding 22 is placed on the outside of the outer non-metallic shielding sleeve 8, and reinforcing sleeves 23 are respectively placed on the outside of the outer non-metallic shielding sleeve 8 at both ends of the stator winding 22. Then, the metal shell 1 is placed on the outside of the stator winding 22. Next, the front flange 2 is placed on the ends of the outer non-metallic shielding sleeve 8 and the metal shell 1, so that the end of the metal shell 1 is inserted into the front fixing ring groove 24, and the retaining seat 9 at the end of the outer non-metallic shielding sleeve 8 is inserted into the limiting ring groove 7 on the metal shell 1. Then, the rear flange 3 is placed on the other end of the outer non-metallic shielding sleeve 8 and the metal shell 1, so that the other end of the metal shell 1 is inserted into the rear fixing ring groove 25, and the retaining seat 9 at the other end of the outer non-metallic shielding sleeve 8 is inserted into the limiting ring groove 7 on the front flange 2. Finally, the metal shell 1, the front flange 2, and the rear flange 3 are welded together. At this time, the outer non-metallic shielding sleeve 22 is fully welded to the outside of the stator winding 22. The extension sleeves 10 at both ends of the metal shielding sleeve 8 are respectively located in the rotating grooves 4 in the middle of the metal outer shell 1 and the front flange 2. Then, the inner non-metallic shielding sleeve 12 is inserted into the inner side of the outer non-metallic shielding sleeve 8, and the slot 13 on the side of the inner non-metallic shielding sleeve 12 is inserted into the slot strip 11 on the inner wall of the outer non-metallic shielding sleeve 8. In addition, the fixing plate 14 is located in the inner cavity of the compression fixing groove 5. Finally, the shaft seal cover 16 is placed at the end of the rear flange 3, and the pressure block 20 is inserted into the compression fixing groove 5. The compression fixing groove 5 is used to compress and fix the fixing plate 14. The shaft seal cover 16 is installed on the rear flange 3 through the cooperation of the screw hole 18, the mounting hole 17 and the bolt 19, thereby fixing the inner non-metallic shielding sleeve 12 and the fixing plate 14. The high-temperature resistant ceramic coating 15 is used to prevent particulate matter in the fluid from affecting the service life of the inner non-metallic shielding sleeve 12.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A shielded pump stator with a non-metallic shielding sleeve, comprising a metal outer shell (1), characterized in that: One end of the metal shell (1) is fixedly fitted with a front flange (2), and the other end of the metal shell (1) is fixedly fitted with a rear flange (3). One end of the rear flange (3) is provided with a sealing mechanism (6). Limiting annular grooves (7) are opened on the end faces of both the front flange (2) and the rear flange (3). Rotation grooves (4) are opened in the middle of both the front flange (2) and the rear flange (3). A pressing and fixing groove (5) is opened at one end of the rear flange (3). An outer non-metallic shielding sleeve (8) is fitted between the front flange (2) and the rear flange (3). Card seats (9) are respectively provided at both ends of the outer non-metallic shielding sleeve (8). The ends of the two card seats (9) are respectively movably fitted into the inner cavities of the two limiting annular grooves (7). Extensions are respectively provided at both ends of the outer non-metallic shielding sleeve (8). The two extension sleeves (10) are respectively movably sleeved to the inner cavity of the two rotating grooves (4). The inner wall of the outer non-metallic shielding sleeve (8) is provided with multiple locking strips (11). The inner cavity of the outer non-metallic shielding sleeve (8) is fitted with an inner non-metallic shielding sleeve (12). The outer side of the inner non-metallic shielding sleeve (12) is provided with a locking groove (13). The end of the locking strip (11) is movably sleeved to the inner cavity of the locking groove (13). The end of the inner non-metallic shielding sleeve (12) extends to the inner cavity of the compression fixing groove (5) and is fixedly connected to a fixing plate (14). The outer side of the outer non-metallic shielding sleeve (8) and the inner cavity of the metal shell (1) are fitted with a stator winding (22). The inner wall of the inner non-metallic shielding sleeve (12) is provided with a high-temperature resistant ceramic coating (15).

2. The shielded pump stator with a non-metallic shielding sleeve according to claim 1, characterized in that: The sealing mechanism (6) includes multiple screw holes (18) opened on the end face of the rear flange (3) and a shaft seal cover (16) placed at the end of the rear flange (3). The shaft seal cover (16) has multiple mounting holes (17). Bolts (19) are fitted into the inner cavities of the multiple mounting holes (17). The ends of the bolts (19) are threaded into the inner cavities of the screw holes (18). A pressure block (20) is provided on the inner side of the shaft seal cover (16). The end of the pressure block (20) extends into the inner cavity of the compression fixing groove (5) and fits against the end face of the fixing plate (14). The end of the pressure block (20) is fixedly connected to a shaft seal seat (21). The end of the shaft seal seat (21) extends into the inner cavity of the high-temperature resistant ceramic coating (15).

3. The shielded pump stator with a non-metallic shielding sleeve according to claim 1, characterized in that: The outer non-metallic shielding sleeve (8) is fitted with two reinforcing sleeves (23) on its outer side. The inner walls of the two reinforcing sleeves (23) are in contact with the outer surface of the outer non-metallic shielding sleeve (8). One end of the two reinforcing sleeves (23) is in contact with both ends of the stator winding (22), and the other end of the two reinforcing sleeves (23) is in contact with the end faces of the front flange (2) and the rear flange (3), respectively.

4. The shielded pump stator with a non-metallic shielding sleeve according to claim 1, characterized in that: The front flange (2) has a front fixing ring groove (24) on its end face, and the rear flange (3) has a rear fixing ring groove (25) on its end face. One end of the metal shell (1) is fixedly sleeved into the inner cavity of the front fixing ring groove (24), and the other end of the metal shell (1) is fixedly sleeved into the inner cavity of the rear fixing ring groove (25).

5. A shielded pump stator with a non-metallic shielding sleeve according to claim 1, characterized in that: The outer side of the extension sleeve (10) and the inner wall of the rotating groove (4) are in contact.

6. A shielded pump stator with a non-metallic shielding sleeve according to claim 1, characterized in that: The inner wall of the outer non-metallic shielding sleeve (8) and the outer side of the inner non-metallic shielding sleeve (12) are in contact with each other, and the outer side of the card strip (11) and the inner wall of the card slot (13) are in contact with each other.

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