Shield pump
By employing a guide hole design with tapered and expanded structures and a baffle plate in the canned pump, the problem of overheating of bearings and shafts caused by fluid resistance in fluid circulation is solved, achieving stability and high efficiency in fluid circulation and reducing wear and frictional heat generation.
Patent Information
- Application Number
- CN202520710998.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-04-16
AI Technical Summary
In existing canned motor pumps, during fluid circulation, the fluid generates resistance along the bearings and shafts between the rotor and impeller, causing the bearings and shafts to overheat, affecting the pump's efficiency, and potentially leading to seizure.
The guide hole design with a gradually narrowing and expanding structure, combined with a baffle and a baffle protrusion, optimizes the fluid flow path, reduces the fluid resistance to the linkage shaft and guide tube, and controls the flow velocity and pressure by assisting the drive of the fluid flow direction through an axial flow impeller.
It effectively reduces the wear and frictional heat generated by the fluid on the linkage shaft and guide pipe, improves the pump's working efficiency, prevents jamming, and ensures the stability and efficiency of fluid circulation.
Smart Images
Figure CN223938347U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a shielded pump, belonging to the field of fluid machinery. Background Technology
[0002] As a type of drive pump suitable for special fluids such as high temperature and corrosive fluids, the rotor, impeller, and rotating shaft of a canned motor pump are all immersed in the fluid working medium. In the existing technology, one type of canned motor pump uses a circulation pipe to circulate the liquid within the pump. During the circulation, the fluid passes through the bearing between the rotor and the impeller. However, when the fluid circulates in a bundle, it passes through the bearing and shaft body. The fluid will generate layer resistance on the surface of the bearing and shaft body. Layer resistance will impede the bearing and shaft, affecting the pump's working efficiency. In addition, the resistance will cause local overheating of the bearing and shaft. For some fluids with poor temperature resistance and low evaporation temperature, burning will occur at the bearing and shaft positions, leading to jamming. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the technical problems in the prior art and provide a shielded pump.
[0004] The technical solution adopted by this utility model to solve its technical problem is:
[0005] A canned pump, comprising:
[0006] The front shell is provided with a centrifuge chamber. An inlet pipe is provided at the front end of the centrifuge chamber, a drain pipe is provided on the side wall of the centrifuge chamber, and a centrifuge impeller is provided inside the centrifuge chamber.
[0007] The rear shell has a circulation chamber inside, and the end of the circulation chamber is connected to the drain pipe side of the front shell through a circulation pipe. The inner wall of the circulation chamber is equipped with an electromagnetic winding. A permanent magnet rotor is set in the middle of the rear shell. The permanent magnet rotor is fixedly connected to the centrifugal impeller through a linkage shaft. The end of the linkage shaft is rotatably connected to the end of the rear shell.
[0008] The middle shell connects the front and rear shells and has an internal turbulence mechanism. The turbulence mechanism includes a guide block that runs through the middle shell, a guide tube embedded in the middle of the guide block, a rotating hole in the middle of the guide tube, and a linkage shaft that passes through the rotating hole and is fixedly connected to the centrifugal impeller. The guide tube has a front guide hole on its front side wall and a rear guide hole on its rear side wall, and the front and rear guide holes are connected to the rotating hole. Several drainage troughs are arranged in a ring array at the front of the guide block. The top of the drainage troughs is connected to the centrifugal chamber of the front shell, and one lateral end of the drainage troughs is connected to the front guide hole. Several inlet troughs are arranged in a ring array at the rear of the guide block. The top of the inlet troughs is connected to the circulation chamber, and one lateral end of the inlet troughs is connected to the rear guide hole.
[0009] Among them, a baffle plate is provided at the bottom of the centrifuge chamber in the front shell, and a number of baffle holes connected to the drain tank are arranged in an array on the baffle plate. A baffle gap is provided between the baffle plate and the centrifuge impeller.
[0010] A circulation pipe is provided between the end of the rear shell and the side wall of the drain pipe.
[0011] As a further improvement of this utility model, a number of arc-shaped sheet-like turbulence protrusions are arranged in a ring array on the back of the centrifugal impeller facing the turbulence plate.
[0012] The turbulence protrusions on the back of the centrifugal impeller can cooperate with the turbulence holes on the baffle plate to turbulent the liquid on the back of the centrifugal impeller, thereby reducing the fluid viscosity between the back of the centrifugal impeller and the baffle plate. At the same time, it provides pressure expansion space for the turbulence holes of the gradually expanding structure, ensuring that the turbulence holes are in a high-pressure position and preventing the fluid in the centrifugal chamber from entering the turbulence holes.
[0013] As a further improvement of this utility model, the turbulence hole is tapered, with the flared end of the turbulence hole facing the centrifuge cavity.
[0014] As a further improvement of this utility model, the front guide hole has a tapered structure, with the flared end of the front guide hole facing the side of the drain tank; the rear guide hole has a tapered structure, with the constricted end of the rear guide hole facing the side of the inlet tank.
[0015] As a further improvement of this utility model, several annular turbulence rings are arranged in a linear array on the surface of the linkage shaft corresponding to the position of the rotating hole.
[0016] The turbulence ring can increase the resistance of the fluid in the gap between the linkage shaft and the guide block, and reduce the probability of the fluid crossing the gap between the linkage shaft and the guide block.
[0017] As a further improvement of this utility model, a drain baffle and an inlet baffle are respectively provided at both ends of the axial direction of the guide block. The drain baffle and the inlet baffle are embedded at both ends of the axial direction of the guide block. A drain hole corresponding to the drain groove is provided on the drain baffle, and an inlet hole corresponding to the inlet groove is provided on the inlet baffle.
[0018] The baffle can extend the opening of the drain tank and the inlet tank, reducing the turbulence caused by the boundary effect of the fluid, and at the same time reducing the wear of the opening of the drain tank and the inlet tank caused by the impact of the edge fluid.
[0019] As a further improvement of this utility model, an annular first limiting groove is provided in the middle of the drain baffle, and an annular second limiting groove is provided in the middle of the inlet baffle. The two ends of the guide pipe are respectively embedded in the first limiting groove and the second limiting groove.
[0020] The limiting groove structure can support the guide tube with high-hardness drain baffles and inlet baffles, thereby improving the stability of the guide tube and reducing the possibility of the guide tube floating due to mechanical vibration.
[0021] As a further improvement of this utility model, the outer ring of the spoiler is embedded in the front shell, and the inner ring of the spoiler is fixed with a front bearing. The front end of the linkage shaft is rotatably connected to the inner ring of the spoiler through the front bearing. A liquid inlet sleeve is provided at the end of the rear shell. The liquid inlet sleeve is coaxially set at the connection position between the rear shell and the circulation pipe. The liquid inlet sleeve is rotatably connected to the rotor shaft at the rear end of the permanent magnet rotor through the rear bearing.
[0022] As a further improvement of this utility model, an axial flow impeller is provided at the end of the connection position between the linkage shaft and the permanent magnet rotor, and the driving direction of the axial flow impeller is arranged opposite to that of the permanent magnet rotor.
[0023] Axial flow impellers can assist in driving the fluid, controlling the direction of fluid flow, and ensuring heat dissipation efficiency.
[0024] The beneficial effects of this utility model are:
[0025] This invention incorporates a series of gradually narrowing orifices in the flow area between the centrifugal chamber and the circulation chamber to turbulentize the fluid. The pressure drop is achieved through the gradual expansion of the rear guide orifice, causing the working fluid to preferentially enter the rear guide orifice via pressure drop compensation, thus reducing the fluid's impact on the linkage shaft. Subsequently, the pressure drop is further reduced and the fluid is ejected through the gradually expanding structure of the front guide orifice, converting pressure into kinetic energy. This ensures the fluid's directional uniformity, reduces turbulence caused by fluid entering at the centrifugal impeller, and further minimizes the fluid's impact on the linkage shaft. Attached Figure Description
[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0027] Figure 1 This is a cross-sectional schematic diagram of the present invention;
[0028] Figure 2 This is a cross-sectional view of the flow guide block;
[0029] Figure 3 This is a rear view of the centrifugal impeller;
[0030] Figure 4 This is a schematic diagram of the spoiler structure;
[0031] In the diagram: 1. Front shell; 2. Middle shell; 3. Rear shell; 4. Inlet pipe; 5. Drain pipe; 6. Centrifuge chamber; 7. Centrifuge impeller; 8. Impeller shaft; 9. Electromagnetic winding; 10. Permanent magnet rotor; 11. Rotor shaft; 12. Rear cover; 13. Inlet sleeve; 14. Drain sleeve; 15. Circulation pipe; 16. Guide pipe; 17. Inlet tank; 18. Inlet baffle; 19. Inlet hole; 20. Drain tank; 21. Drain baffle; 22. Drain hole; 23. Rear guide hole; 24. Front guide hole; 25. Linkage shaft; 26. Turbid ring; 27. Turbid plate; 28. Turbid hole; 29. Turbid protrusion; 30. Axial flow impeller; 31. Rear bearing; 32. Front bearing. Detailed Implementation
[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0033] A canned pump, comprising:
[0034] Front shell 1, as Figure 1 The front casing 1 is provided with a centrifuge chamber 6, an inlet pipe 4 is provided at the front end of the centrifuge chamber 6, a drain pipe 5 is provided on the side wall of the centrifuge chamber 6, a centrifuge impeller 7 is provided inside the centrifuge chamber 6, and an impeller shaft 8 is provided in the middle of the centrifuge impeller 7. Figure 3 Several arc-shaped, sheet-like turbulence protrusions 29 are arranged in a ring array on one side of the back of the centrifugal impeller 7.
[0035] Rear shell 3, such as Figure 1 The rear shell 3 is provided with a circulation chamber. The rear cover 12 is fixed to the end of the rear shell 3 by a flange. The end of the circulation chamber is connected to the drain sleeve 14 on the side wall of the drain pipe 5 of the front shell 1 by a circulation pipe 15. The inner wall of the circulation chamber is provided with an electromagnetic winding 9. A permanent magnet rotor 10 is provided in the middle of the rear shell 3. The rotor shaft 11 is located in the middle of the permanent magnet rotor 10. The rotor shaft 11 is rotatably connected to the middle of the rear shell 3. The permanent magnet rotor 10 is fixedly connected to the centrifugal impeller 7 by a linkage shaft 25. Several annular turbulence rings 26 are arranged in a linear array on the surface of the linkage shaft 25 at the position corresponding to the rotating hole.
[0036] Middle shell 2, such as Figure 1The middle shell 2 is connected between the front shell 1 and the rear shell 3. A flow-turbulence mechanism is installed inside the middle shell 2. The flow-turbulence mechanism includes a guide block that penetrates the middle shell 2. A guide pipe 16 is embedded in the center of the guide block. A rotating hole is provided in the center of the guide pipe 16. A linkage shaft 25 passes through the rotating hole and is fixedly connected to the centrifugal impeller 7. The front sidewall of the guide pipe 16 has a front guide hole 24, and the rear sidewall of the guide pipe 16 has a rear guide hole 23. The front guide hole 24 and the rear guide hole 23 communicate with the rotating hole. The front guide hole 24 has a tapered structure, with its flared end facing the drain tank 20. The rear guide hole 23 has a tapered structure, with its constricted end facing the inlet tank 17. Figure 2 A plurality of drainage troughs 20 are arranged in a ring array at the front of the guide block. The top of the drainage troughs 20 is connected to the centrifuge chamber 6 of the front shell 1, and one lateral end of the drainage troughs 20 is connected to the front guide hole 24. A plurality of inlet troughs 17 are arranged in a ring array at the rear of the guide block. The top of the inlet troughs 17 is connected to the circulation chamber, and one lateral end of the inlet troughs 17 is connected to the rear guide hole 23. A drainage baffle 21 and an inlet baffle 18 are respectively provided at both axial ends of the guide block. The drain baffle 21 and the inlet baffle 18 are embedded at both ends of the guide block. The drain baffle 21 is provided with a drain hole 22 corresponding to the drain groove 20, and the inlet baffle 18 is provided with an inlet hole 19 corresponding to the inlet groove 17. A first annular limiting groove is provided in the middle of the drain baffle 21, and a second annular limiting groove is provided in the middle of the inlet baffle 18. The two ends of the guide pipe 16 are respectively embedded in the first limiting groove and the second limiting groove.
[0037] Among them, a baffle 27 is provided at the bottom of the centrifuge chamber 6 of the front shell 1, such as Figure 4 The baffle plate 27 is provided with an array of several baffle holes 28 that communicate with the drain tank 20. A baffle gap is provided between the baffle plate 27 and the centrifugal impeller 7. The baffle holes 28 are tapered structures, and the flared ends of the baffle holes 28 are set towards the centrifugal cavity 6.
[0038] A circulation pipe 15 is provided between the end of the rear shell 3 and the side wall of the drain pipe 5.
[0039] The outer ring of the spoiler 27 is embedded in the front shell 1, and the inner ring of the spoiler 27 is fixed with a front bearing 32. The front end of the linkage shaft 25 is rotatably connected to the inner ring of the spoiler 27 through the front bearing 32. A liquid inlet sleeve 13 is provided at the end of the rear shell 3. The liquid inlet sleeve 13 is coaxially set at the connection position between the rear shell 3 and the circulation pipe 15. The liquid inlet sleeve 13 is rotatably connected to the rotor shaft 11 at the rear end of the permanent magnet rotor 10 through the rear bearing 31.
[0040] An axial flow impeller 30 is provided at the end of the connection between the linkage shaft 25 and the permanent magnet rotor 10, and the driving direction of the axial flow impeller 30 is arranged opposite to that of the permanent magnet rotor 10.
[0041] In use, fluid enters the centrifuge chamber 6 through the inlet pipe 4, and is then discharged from the outlet pipe 5 driven by the centrifuge impeller 7. Subsequently, some liquid, under the pressure of the outlet pipe 5, passes through the outlet sleeve 14, circulation pipe 15, and inlet sleeve 13 into the circulation chamber of the rear shell 3. By impacting the inner wall of the circulation chamber, it cools the permanent magnet rotor 10 and the electromagnetic winding 9. The cooled liquid, driven by the axial flow impeller 30, passes through the inlet hole 19 into the inlet tank 17. After passing through the gradually expanding rear guide hole 23, the fluid is pressurized, allowing it to enter the gap between the linkage shaft 25 and the guide pipe 16 at a lower flow rate and higher pressure. After being decelerated by the turbulence protrusion 29, it enters the front guide hole 24 at a lower speed and pressure. The outlet tank 20 is then cooled by the combined action of the turbulence protrusion 29 and the turbulence hole 28. The internal negative pressure is generated, which then causes the fluid entering the front guide hole 24 to be further pressurized and its velocity reduced through the gradually expanding structure of the front guide hole 24. The liquid entering the space between the bottom of the centrifugal impeller 7 and the baffle 27 has a lower velocity, that is, lower flow resistance. At the same time, the high-pressure fluid is directly forced into the centrifugal chamber 6, preventing the positive pressure liquid in the centrifugal chamber 6 from directly passing through the gap between the linkage shaft 25 and the guide pipe 16 into the circulation chamber, which would affect the normal circulation of the liquid. This structure can not only increase the disturbance of the fluid between the linkage shaft 25 and the guide pipe 16, but also reduce the flow velocity of the fluid between the linkage shaft 25 and the guide pipe 16, thereby reducing the flow resistance of the fluid on the linkage shaft 25 and the guide pipe 16, and reducing the heat generated by wear and friction of the linkage shaft 25 and the guide pipe 16.
[0042] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A canned motor pump, characterized in that it comprises: The front shell (1) is provided with a centrifugal chamber (6), the front end of the centrifugal chamber (6) is provided with an inlet pipe (4), the side wall of the centrifugal chamber (6) is provided with a drain pipe (5), and the centrifugal impeller (7) is provided inside the centrifugal chamber (6). The rear shell (3) has a circulation chamber inside. The end of the circulation chamber is connected to the drain pipe (5) side of the front shell (1) through a circulation pipe (15). An electromagnetic winding (9) is provided on the inner wall of the circulation chamber. A permanent magnet rotor (10) is provided in the middle of the rear shell (3). The permanent magnet rotor (10) is fixedly connected to the centrifugal impeller (7) through a linkage shaft (25). The end of the linkage shaft (25) is rotatably connected to the end of the rear shell (3). The middle shell (2) is connected between the front shell (1) and the rear shell (3). The middle shell (2) is equipped with a flow-disrupting mechanism. The flow-disrupting mechanism includes a flow-guiding block that runs through the middle shell (2). A flow-guiding tube (16) is embedded in the middle of the flow-guiding block. A rotating hole is provided in the middle of the flow-guiding tube (16). The linkage shaft (25) passes through the rotating hole and is fixedly connected to the centrifugal impeller (7). The front side wall of the flow-guiding tube (16) is provided with a front flow-guiding hole (24), and the rear side wall of the flow-guiding tube (16) is provided with a rear flow-guiding hole (24). 23), the front guide hole (24) and the rear guide hole (23) are connected to the rotating hole; a number of drain troughs (20) are arranged in an annular array at the front of the guide block. The top of the drain trough (20) is connected to the centrifugal chamber (6) of the front shell (1). The lateral end of the drain trough (20) is connected to the front guide hole (24). A number of inlet troughs (17) are arranged in an annular array at the rear of the guide block. The top of the inlet trough (17) is connected to the circulation chamber. The lateral end of the inlet trough (17) is connected to the rear guide hole (23). Among them, a baffle plate (27) is provided at the bottom of the centrifugal chamber (6) of the front shell (1), and a number of baffle holes (28) connected to the drain tank (20) are arranged on the baffle plate (27). A baffle gap is provided between the baffle plate (27) and the centrifugal impeller (7). A circulation pipe (15) is provided between the end of the rear shell (3) and the side wall of the drain pipe (5).
2. The canned pump as described in claim 1, characterized in that: Several arc-shaped, sheet-like turbulence protrusions (29) are arranged in a ring array on the back side of the centrifugal impeller (7) facing the turbulence plate (27).
3. A canned pump as described in claim 1, characterized in that: The turbulence hole (28) has a tapered structure, with the flared end of the turbulence hole (28) facing the centrifugal cavity (6).
4. A canned pump as described in claim 1, characterized in that: The front guide hole (24) has a tapered structure, with the flared end of the front guide hole (24) facing the side of the drain tank (20); the rear guide hole (23) has a tapered structure, with the constricted end of the rear guide hole (23) facing the side of the inlet tank (17).
5. A canned pump as described in claim 1, characterized in that: Several annular turbulence rings (26) are arranged in a linear array at the position corresponding to the rotating hole on the surface of the linkage shaft (25).
6. A canned pump as described in claim 1, characterized in that: A drain baffle (21) and an inlet baffle (18) are respectively provided at both ends of the axial direction of the guide block. The drain baffle (21) and the inlet baffle (18) are embedded at both ends of the axial direction of the guide block. A drain hole (22) corresponding to the drain groove (20) is provided on the drain baffle (21), and an inlet hole (19) corresponding to the inlet groove (17) is provided on the inlet baffle (18).
7. A canned pump as described in claim 6, characterized in that: in A first annular limiting groove is provided in the middle of the drain baffle (21), and a second annular limiting groove is provided in the middle of the inlet baffle (18). The two ends of the guide pipe (16) are respectively embedded in the first limiting groove and the second limiting groove.
8. A canned pump as described in claim 1, characterized in that: The outer ring of the spoiler (27) is embedded in the front shell (1). The inner ring of the spoiler (27) is fixed with a front bearing (32). The front end of the linkage shaft (25) is rotatably connected to the inner ring of the spoiler (27) through the front bearing (32). A liquid inlet sleeve (13) is provided at the end of the rear shell (3). The liquid inlet sleeve (13) is coaxially set at the connection position between the rear shell (3) and the circulation pipe (15). The liquid inlet sleeve (13) is rotatably connected to the rotor shaft (11) at the rear end of the permanent magnet rotor (10) through the rear bearing (31).
9. A canned pump as described in claim 1, characterized in that: An axial flow impeller (30) is provided at the end of the connection position between the linkage shaft (25) and the permanent magnet rotor (10), and the driving direction of the axial flow impeller (30) is arranged opposite to the permanent magnet rotor (10).