Multistage contra-rotating pump of reluctance motor
Through the multi-stage counter-rotating pump driven by a magnetoresistive motor, the problems of low efficiency of traditional axial flow pumps and high cost of permanent magnet synchronous pumps are solved, and an efficient and compact pump body design is achieved, suitable for changing environments and small flow scenarios.
Patent Information
- Application Number
- CN202420998351.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-09
AI Technical Summary
Traditional axial flow pumps are low efficiency and large in size, permanent magnet synchronous axial flow pumps are costly and susceptible to high temperatures, traditional multi-stage centrifugal pumps are complex in structure and have high maintenance costs, poor sealing, difficult to adapt to variable working environments and low flow rates Head scene.
The multi-stage counter-rotation pump driven by a reluctance motor is adopted. Through the counter-rotation impeller design, the motor directly drives the impeller to rotate, improving efficiency and reducing the pump body volume. Combining the integration of the design of the reluctance motor and the impeller, it improves sealing and efficiency. Avoid the demagnetization problem of permanent magnets.
It improves the efficiency and sealing of the pump, reduces the pump volume and maintenance costs, adapts to variable working environments and low flow and low head scenarios, and realizes real-time adjustment of flow and pressure.
Smart Images
Figure CN222254363U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of pumps, and more specifically, to a multi-stage counter-rotating pump of a reluctance motor. Background Art
[0002] With the continuous development of industrial technology, pumps, as key equipment for fluid transportation, are widely used in various fields. Axial flow pumps are a type of fluid machinery suitable for low head and large flow scenarios. At present, axial flow pumps are widely used in water treatment, chemical, petroleum and other industries due to their high head and large flow. At present, axial flow pumps on the market have the following shortcomings:
[0003] Traditional axial flow pump: Traditional axial flow pumps are usually driven by asynchronous motors or DC motors, so they are large in size. Due to the limitation of motor efficiency, the overall energy efficiency is low, and the speed regulation performance is poor, making it difficult to adapt to changing working environments.
[0004] Permanent magnet synchronous axial flow pump: It uses a permanent magnet synchronous motor, which has high energy efficiency and good speed regulation performance. However, due to the high cost of permanent magnet materials and the susceptibility to demagnetization due to high temperature and magnetic field, its application range is limited.
[0005] Traditional multistage centrifugal pump: Multistage centrifugal pump has high head and good flow characteristics, suitable for long-distance transportation. However, it has a complex structure, high maintenance cost, and low efficiency at low flow and low head. There are also problems such as poor sealing, low efficiency, easy leakage, and difficult maintenance.
[0006] Therefore, how to optimize the axial flow pump is exactly the technical problem to be solved by this application. Utility Model Content
[0007] In view of the shortcomings of the prior art, a multi-stage counter-rotating pump with a reluctance motor is proposed. The present application adopts a counter-rotating impeller, and the motor directly drives the impeller to rotate, thereby improving the efficiency of the pipeline pump and reducing the volume of the pump body.
[0008] A reluctance motor multi-stage counter-rotating pump, comprising a housing, a main shaft, a fixing member, a first motor, a second motor, a first impeller and a second impeller, wherein the main shaft is arranged in the housing and fixedly connected to the housing through the fixing member, the first motor and the second motor are both arranged on the main shaft, the first impeller is arranged on the first motor, and the first motor is used to control the rotation of the first impeller to transfer the fluid medium from the inlet to the outlet of the housing;
[0009] The second impeller is arranged on the second motor, the direction of the second impeller is opposite to the direction of the first impeller, and the second motor is used to control the rotation of the second impeller to transfer the fluid medium from the inlet to the outlet of the housing;
[0010] In summary, the above technical scheme has the following beneficial effects: the pump body of the present application adopts a plurality of first impellers and second impellers in opposite directions to jointly drive the fluid medium from the inlet to the outlet. Because the directions of the first impeller and the second impeller are opposite, the directions of rotation of the first motor and the second motor are opposite, so that the conveying directions of the first impeller and the second impeller can be consistent, and the fluid medium is conveyed from the inlet to the outlet of the shell. Compared with the problems of large size and low efficiency of the traditional axial flow pump motor, the present application adopts counter-rotating impellers, and the motor directly drives the impeller to rotate, which improves the efficiency and can reduce the volume of the pump body. Compared with the permanent magnet synchronous axial flow pump, the present application uses a reluctance motor, and the reluctance motor has no permanent magnets to avoid the problem of permanent magnet demagnetization. Compared with the traditional multi-stage centrifugal pump with complex structure and high maintenance cost, the reluctance motor and impeller are designed to be integrated in the present application, and the motor directly drives the impeller to rotate, and improves the sealing and efficiency of the pipeline pump. The impeller of the pipeline pump also conforms to the law of fluid kinematics. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 A schematic cross-sectional view of a multi-stage counter-rotating pump of a reluctance motor;
[0012] Figure 2 The present invention is a schematic diagram of a first impeller and a second impeller of a multi-stage counter-rotating pump of a reluctance motor.
[0013] Figure numerals: 10, housing; 20, main shaft; 30, fixing member; 31, connecting block; 32, guide plate; 40, first motor; 50, second motor; 60, first impeller; 70, second impeller. DETAILED DESCRIPTION
[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.
[0015] like Figure 1 and Figure 2As shown, a reluctance motor multi-stage counter-rotating pump includes a housing 10, a main shaft 20, a fixing member 30, a first motor 40, a second motor 50, a first impeller 60 and a second impeller 70. The main shaft 20 is arranged in the housing 10 and is fixedly connected to the housing 10 through the fixing member 30. The first motor 40 and the second motor 50 are both arranged on the main shaft 20. The first impeller 60 is arranged on the first motor 40. The first motor 40 is used to control the rotation of the first impeller 60 to transfer the fluid medium from the inlet to the outlet of the housing 10. The second impeller 70 is arranged on the second motor 50. The direction of the impeller 70 is opposite to that of the first impeller 60, and the second motor 50 is used to control the rotation of the second impeller 70 to transfer the fluid medium from the inlet to the outlet of the housing 10; the pump body of the present application uses a plurality of first impellers 60 and second impellers 70 with opposite directions to jointly drive the fluid medium from the inlet to the outlet. Because the first impeller 60 and the second impeller 70 are in opposite directions, the first motor 40 and the second motor 50 rotate in opposite directions, so that the conveying directions of the first impeller 60 and the second impeller 70 can be consistent, and both convey the fluid medium from the inlet to the outlet of the housing. Compared with the problems of large size and low efficiency of traditional axial flow pump motors, the present application adopts counter-rotating impellers, and the motor directly drives the impeller to rotate, which improves efficiency and can reduce the volume of the pump body. Compared with the permanent magnet synchronous axial flow pump, the present application uses a reluctance motor, and the reluctance motor has no permanent magnets to avoid the problem of permanent magnet demagnetization. Compared with the traditional multi-stage centrifugal pump with complex structure and high maintenance cost, the reluctance motor and impeller are integrated in this application. The motor directly drives the impeller to rotate, and the sealing and efficiency of the pipeline pump are improved. The impeller of the pipeline pump also conforms to the laws of fluid kinematics.
[0016] The fixing member 30 includes a connecting block 31 and a plurality of guide plates 32. The connecting block 31 is connected to the end of the main shaft 20 close to the outlet or the end close to the inlet. The plurality of guide plates 32 are arranged around the connecting block 31. The connecting block 31 is fixedly connected to the housing 10 through the guide plates 32. The orientations of the plurality of guide plates 32 are all along the extension direction of the main shaft 20. The main shaft 20 is arranged at the center of the housing. The connecting block 31 is connected to the main shaft 20. The connecting block 31 is fixedly connected to the housing 10 through the guide plates 32, so that the fixed shaft is fixed at the center of the housing. The orientation of the guide plates 32 is along the direction of the main shaft 20, which can offset the rotation of the fluid medium and allow the rotating fluid in the housing to flow along the direction of the main shaft 20. The connecting block 31 and the guide plates 32 are also used to fix the main shaft 20 at the center of the housing. The connecting block 31 can be provided with a sleeve hole that is sleeved with the main shaft 20, so as to engage with the main shaft 20, or the connecting block 31 and the main shaft 20 are fixedly connected by welding or the like. The guide plate 32 and the connecting block 31 may be designed as an integral unit, and the guide plate 32 and the housing may be snap-fitted or fixedly connected by welding or the like.
[0017] Because the pump body is generally arranged in a pipeline, the housing 10 is preferably arranged in a cylindrical shape. The guide plates 32 may be arranged in a mesh shape along the extension direction of the main shaft 20, or may extend radially from the connection block 31 to the housing, preferably extending radially from the connection block 31 to the housing.
[0018] Two fixing members 30 are provided, which are respectively provided at one end of the main shaft 20 close to the outlet and the other end close to the inlet. The two fixing members 30 can make the main shaft 20 more stably located at the center of the shell, and the two fixing members 30 can make the fluid medium flow along the direction in which the main shaft 20 extends when the fluid medium enters the shell inlet, and also flow along the direction in which the main shaft 20 extends when the fluid medium flows out of the shell outlet.
[0019] A plurality of first motors 40 are disposed on the main shaft 20 , and a plurality of second motors 50 are disposed on the main shaft 20 . Each first motor 40 is provided with a first impeller 60 , and each second motor 50 is provided with a second impeller 70 .
[0020] Embodiment 1: The first motor 40 and the second motor 50 are arranged alternately, so that the first impeller 60 and the second impeller 70 are arranged alternately. For example, from one end of the main shaft 20 to the other end, there are the first motor 40, the second motor 50, the first motor 40, the second motor 50... and so on, and the first impeller 60 and the second impeller 70 are arranged correspondingly. Preferably, there are two first motors 40 and two second motors 50, and the first impeller 60 and the second impeller 70 are arranged correspondingly.
[0021] Embodiment 2: The first motor 40 and the second motor 50 are arranged non-alternatingly, so that the first impeller 60 and the second impeller 70 are arranged non-alternatingly. For example, from one end of the main shaft 20 to the other end, there are the first motor 40, the first motor 40, the second motor 50, the second motor 50, the first motor 40, and the second motor 50, respectively, and the first impeller 60 and the second impeller 70 are arranged correspondingly, wherein the first motor 40 and the second motor 50 are not arranged alternately, and there may be a plurality of consecutive first impellers 60 adjacent to each other, or a plurality of second impellers 70 adjacent to each other.
[0022] Embodiment 3: The number of first motors 40 and the number of second motors 50 are the same. According to the situations of embodiment 1 and embodiment 2, the first motors 40 and the second motors 50 of the same number can be arranged alternately or non-alternatingly. If arranged alternately, the first motor 40, the second motor 50, the first motor 40, the second motor 50 from one end of the main shaft 20 to the other end can be arranged alternately in sequence, and the first impeller 60 and the second impeller 70 are arranged accordingly. If arranged non-alternatingly, the first motor 40, the first motor 40, the second motor 50, the second motor 50 from one end of the main shaft 20 to the other end can be arranged alternately in sequence, and the first impeller 60 and the second impeller 70 are arranged accordingly.
[0023] Embodiment 4: The number of first motors 40 and the number of second motors 50 are different. According to the situations of embodiment 1 and embodiment 2, the different numbers of first motors 40 and second motors 50 can be arranged alternately or non-alternatingly. If arranged alternately, the first motor 40, the second motor 50, and the first motor 40 can be arranged alternately from one end of the main shaft 20 to the other end, and the first impeller 60 and the second impeller 70 are arranged accordingly. If arranged non-alternatingly, the first motor 40, the first motor 40, and the second motor 50 can be arranged alternately from one end of the main shaft 20 to the other end, and the first impeller 60 and the second impeller 70 are arranged accordingly.
[0024] The inner diameter of the outlet of the housing 10 is smaller than the inner diameter of the inlet. The fluid medium is transferred from the inside of the housing 10 through the impeller. The inner diameter of the outlet of the housing 10 is smaller than the inner diameter of the inlet, which can increase the outflow speed of the fluid medium.
[0025] The first motor 40 and the second motor 50 are both reluctance motors. The first motor 40 and the second motor 50 can also be permanent magnet synchronous motors or other motors with the same function. Preferably, the motor of the present application is a reluctance motor, which is also called a vector reluctance motor. It is a new type of brushless DC motor with the advantages of simple structure, high reliability, and good speed regulation performance. Specifically, the stator of the motor is fixedly connected to the main shaft 20 through a gasket, a waterproof bearing and a sleeve in sequence, and the stator rotates with the rotor.
[0026] The first motor 40 and the first impeller 60 are designed as one piece, and the second motor 50 and the second impeller 70 are designed as one piece. Specifically, the rotor of the first motor 40 and the first impeller 60 are designed as one piece, and the rotor of the second motor 50 and the second impeller 70 are designed as one piece. The integrated motor and impeller can reduce production costs, and can also make the impeller rotate more stably to avoid impeller slippage.
[0027] When the pump body of the present application is working, the four reluctance motors are controlled separately, for example, the first motor 40 of the first group and the first motor 40 of the second group rotate clockwise, and the second motor 50 of the first group and the second motor 50 of the second group rotate counterclockwise. The first motor 40 of the first group and the second motor 50 of the first group form a pair of double counter-rotation, and the first motor 40 of the second group and the second motor 50 of the second group form a pair of double counter-rotation, thereby forming multi-stage counter-rotation.
[0028] The reluctance motor multi-stage counter-rotating axial flow pump is a highly efficient water pump technology that combines the excellent performance of the reluctance motor with the structural characteristics of the axial flow pump. The reluctance motor multi-stage counter-rotating pump can transport liquid media. At the same time, when the fluid medium flows through the pipeline pump, as long as the impeller rotates, the reluctance motor multi-stage counter-rotating pump will become a generator. Since the size of the motor blades can be customized, the reluctance motor multi-stage counter-rotating pump can be used for liquid transportation in various fields. In a multi-stage counter-rotating pump, one group of counter-rotating pumps can be used or multiple groups of counter-rotating pumps can be used. The blades of each group can also be differentiated according to different requirements and are suitable for the transportation of different liquids.
[0029] The beneficial effects of this application include:
[0030] 1. The motor and impeller are integrated, with a more compact structure.
[0031] 2. The motor stator packaging design allows the fluid to pass through the rotor gap to dissipate heat.
[0032] 3. Multi-stage blades can operate at differential speeds to achieve real-time adjustment of flow and pressure.
[0033] 4. When the blades of the reluctance multi-stage counter-rotating pump are driven to rotate by external force, it can be used as a generator.
[0034] 5. The fluid driven by the reluctance multi-stage counter-rotating pump can be water, organic liquid, or gas.
[0035] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.
Claims
1. A multi-stage counter-rotating pump with a reluctance motor, characterized in that: The invention comprises a housing (10), a main shaft (20), a fixing member (30), a first motor (40), a second motor (50), a first impeller (60) and a second impeller (70); the main shaft (20) is arranged in the housing (10) and is fixedly connected to the housing (10) through the fixing member (30); the first motor (40) and the second motor (50) are both arranged on the main shaft (20); the first impeller (60) is arranged on the first motor (40); the first motor (40) is used to control the rotation of the first impeller (60) to transfer the fluid medium from the inlet of the housing (10) to the outlet; The second impeller (70) is arranged on the second motor (50), and the direction of the second impeller (70) is opposite to that of the first impeller (60). The second motor (50) is used to control the rotation of the second impeller (70) to transfer the fluid medium from the inlet to the outlet of the housing (10).
2. The reluctance motor multi-stage counter-rotating pump according to claim 1, characterized in that: The fixing member (30) comprises a connecting block (31) and a plurality of guide plates (32); the connecting block (31) is connected to an end of the main shaft (20) close to the outlet or to an end close to the inlet; The plurality of guide plates (32) are arranged around the connection block (31); the connection block (31) is fixedly connected to the housing (10) via the guide plates (32); and the orientations of the plurality of guide plates (32) are all along the extension direction of the main shaft (20).
3. The reluctance motor multi-stage counter-rotating pump according to claim 1, characterized in that: Two fixing members (30) are provided, and are respectively arranged at one end of the main shaft (20) close to the outlet and one end close to the inlet.
4. The reluctance motor multi-stage counter-rotating pump according to claim 1, characterized in that: A plurality of the first motors (40) are arranged on the main shaft (20), and a plurality of the second motors (50) are arranged on the main shaft (20). Each of the first motors (40) is provided with a first impeller (60), and each of the second motors (50) is provided with a second impeller (70).
5. The reluctance motor multi-stage counter-rotating pump according to claim 4, characterized in that: The first motor (40) and the second motor (50) are arranged alternately, so that the first impeller (60) and the second impeller (70) are arranged alternately.
6. The multi-stage counter-rotating reluctance motor pump according to claim 4, characterized in that: The first motor (40) and the second motor (50) are arranged non-alternatingly, so that the first impeller (60) and the second impeller (70) are arranged non-alternatingly.
7. The reluctance motor multi-stage counter-rotating pump according to claim 4, characterized in that: The number of the first motors (40) and the number of the second motors (50) are the same.
8. The reluctance motor multi-stage counter-rotating pump according to claim 4, characterized in that: The number of the first motors (40) and the number of the second motors (50) are different.
9. The reluctance motor multi-stage counter-rotating pump according to claim 1, characterized in that: The inner diameter of the housing (10) at the outlet is smaller than the inner diameter at the inlet.
10. The reluctance motor multi-stage counter-rotating pump according to any one of claims 1 to 9, characterized in that: The first motor (40) and the first impeller (60) are designed as an integral unit, and the second motor (50) and the second impeller (70) are designed as an integral unit.