Magnetic drive pump with freely balanced axial force

Abstract

The utility model relates to a magnetic drive pump capable of freely balancing axial force, which comprises a pump cover and a pump body which are encircled to form a pump cavity, an isolation cavity is defined by the isolation sleeve and the side, away from the pump cover, of the pump body; the pump shaft penetrates through the pump cavity and the isolation cavity; the impeller is positioned in the pump cavity and arranged at one end of the pump shaft; the balance rotor and the balance stator are located in the isolation cavity and sequentially arranged on the pump shaft in a sleeving mode; the inner rotor assembly is located in the isolation cavity and arranged on the pump shaft in a sleeving mode. And the outer rotor assembly is positioned outside the isolation cavity and is opposite to the inner rotor assembly. An axial thrust bearing adopted by a conventional magnetic drive pump is replaced by the balance stator and the balance rotor, so that mechanical friction is effectively avoided, and the service life of the pump is remarkably prolonged; meanwhile, attraction force between the permanent magnets serves as balance force, compared with a traditional repulsive force mode, the use amount of magnetic materials is greatly reduced, the internal space of equipment can be effectively saved, and free balance of axial force is achieved while low-cost operation is achieved.

Description

Technical Field

[0001] This utility model relates to the field of magnetic pump technology, specifically to a magnetic pump with free axial force balance. Background Technology

[0002] Magnetic drive pumps, as fully sealed and leak-free chemical pumps, are widely used in industries such as petroleum, chemical, pharmaceutical, electronic aluminum foil, and new energy. However, axial force balance has always been a problem that affects the service life of magnetic drive pumps. Conventional magnetic drive pumps often use methods such as balancing holes, back vanes, and balancing discs to balance the axial force. However, due to limitations in machining accuracy and changes in operating conditions, the axial force after balancing may remain or deviate from the design value, requiring the use of axial thrust bearings to bear it. This leads to wear of the axial thrust bearings, and in severe cases, the axial thrust bearings may break, causing the impeller to rub against the pump body. Utility Model Content

[0003] The purpose of this invention is to overcome at least one of the defects of the prior art and provide a magnetic pump with free axial force balance.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A magnetic pump with free axial force balance, comprising:

[0006] The pump cover and pump body together form the pump cavity;

[0007] An isolation sleeve that surrounds the side of the pump body opposite to the pump cover to form an isolation cavity;

[0008] A pump shaft passing through the pump chamber and the isolation chamber;

[0009] An impeller located inside the pump chamber and disposed at one end of the pump shaft;

[0010] A balance rotor and a balance stator are located inside the isolation chamber and sequentially mounted on the pump shaft, with no mechanical contact between the balance rotor and the balance stator;

[0011] The inner rotor assembly located within the isolation chamber and sleeved on the pump shaft;

[0012] An outer rotor assembly located outside the isolation cavity and disposed opposite to the inner rotor assembly.

[0013] Furthermore, both the balancing stator and the balancing rotor are assembled from multi-layered, multi-pole tile-shaped permanent magnets. The permanent magnets in the same layer are multiple permanent magnets with the same pole, forming a repulsive structure. The adjacent layers use permanent magnets with different polarities, forming an attractive structure. There is no mechanical contact or friction between the balancing stator and the balancing rotor.

[0014] Furthermore, the outer surfaces of the balance stator and the balance rotor are covered with corrosion-resistant stainless steel sheaths to make them suitable for different working conditions and to provide corrosion resistance.

[0015] Furthermore, the thickness of the corrosion-resistant stainless steel sheath is 0.2–0.3 mm.

[0016] Furthermore, the air gap between the stainless steel sheath of the balancing stator and the stainless steel sheath of the balancing rotor is smaller than the annular gap between the impeller and the pump body, thereby reducing the air gap and increasing the balancing force of the balancing stator and the balancing rotor.

[0017] Furthermore, a bearing assembly is provided on the pump shaft. The bearing assembly includes a bushing, a pair of sliding bearings, and a bearing seat, which are sequentially sleeved on the pump shaft from the inside to the outside. The pair of sliding bearings are respectively sleeved on both sides of the bushing.

[0018] Furthermore, a first sealing gasket is provided at the connection between the pump cover and the pump body.

[0019] Furthermore, a second sealing gasket is provided at the connection between the pump cover and the isolation sleeve.

[0020] Furthermore, the rear cover plate of the impeller is provided with back blades.

[0021] Furthermore, the magnetic pump is also equipped with a drive motor connected to the outer rotor assembly.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (1) This utility model proposes a magnetic pump with free axial force balance. The magnetic pump replaces the axial thrust bearing used in conventional magnetic pumps with a balanced stator and a balanced rotor, which effectively avoids mechanical friction problems and significantly improves the overall service life of the pump. In addition, by using the attraction between permanent magnets as the balancing force, compared with the traditional repulsion method, it can not only save a lot of magnetic materials, but also effectively save internal space of the equipment, and achieve free axial force balance while realizing low-cost operation.

[0024] (2) This utility model proposes a magnetic pump with free axial force balance. The bearing assembly of the magnetic pump is a double sliding bearing support structure, which makes the force state of the bearing at both ends more balanced and effectively improves the stability of the equipment. Among them, the sliding bearing is made of pressureless sintered silicon carbide. Compared with graphite, PTFE-filled graphite and reaction sintered silicon carbide, this material has higher hardness and more outstanding corrosion resistance and wear resistance, thus exhibiting higher stability and reliability during operation and greatly extending the service life of the pump.

[0025] (3) This utility model proposes a magnetic pump with free axial force balance. The permanent magnets used in the balance stator and balance rotor of the magnetic pump can be adjusted according to the working conditions. It has a wide range of applications and can withstand high and low temperatures.

[0026] (4) This utility model proposes a magnetic pump with free axial force balance. The rotor shaft of the magnetic pump has no seal. Only the pump body and the end face of the isolation sleeve need to be sealed with a sealing gasket. It is a static seal, so the conveyed medium will not leak, which is safe and reliable. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a magnetic pump with free axial force balance in the embodiment.

[0028] Figure 2 This is a front view of the balanced rotor magnetic circuit arrangement in the embodiment;

[0029] Figure 3 This is a cross-sectional view of the balanced rotor magnetic circuit arrangement in the embodiment;

[0030] Figure 4 This is a front view of the balanced stator magnetic circuit arrangement in the embodiment;

[0031] Figure 5 This is a cross-sectional view of the balanced stator magnetic circuit arrangement in the embodiment;

[0032] The following components are labeled in the diagram: Pump body 1, Impeller 2, Impeller nut 3, Pump cover 4, First sealing gasket 5, Second sealing gasket 6, Balance stator 7, Balance rotor 8, Connecting plate 9, Third sealing gasket 10, Bearing seat 11, Sliding bearing 12, Shaft sleeve 13, Pump shaft 14, Inner rotor assembly 15, Isolation sleeve 16, Outer rotor assembly 17, Connecting frame 18, Drive motor 19. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0034] Example

[0035] This embodiment provides a magnetic pump with free axial force balance; see the specific structure below. Figure 1-5 ,include:

[0036] Pump cover 4 and pump body 1 together form the pump cavity;

[0037] An isolation sleeve 16 is formed by enclosing the side of the pump body 1 opposite to the pump cover 4 to form an isolation cavity;

[0038] Pump shaft 14 passing through the pump chamber and the isolation chamber;

[0039] An impeller 2 is located inside the pump chamber and is disposed at one end of the pump shaft 14;

[0040] A balance rotor 8 and a balance stator 7 are located inside the isolation chamber and are sequentially sleeved on the pump shaft 14. There is no mechanical contact between the balance rotor 8 and the balance stator 7.

[0041] The inner rotor assembly 15 is located inside the isolation chamber and sleeved on the pump shaft 14;

[0042] An outer rotor assembly 17 is located outside the isolation cavity and is disposed opposite to the inner rotor assembly 15.

[0043] See you again Figure 2-5 In this embodiment, both the balance stator 7 and the balance rotor 8 are assembled from multi-layered, multi-pole tile-shaped permanent magnets. The permanent magnets in the same layer are multiple permanent magnets with the same pole, forming a repulsive structure. The adjacent layers use permanent magnets with different polarities, forming an attractive structure. There is no mechanical contact or friction between the balance stator 7 and the balance rotor 8.

[0044] In this embodiment, the outer surfaces of the balance stator 7 and the balance rotor 8 are covered with corrosion-resistant stainless steel sheaths to adapt to different working conditions and provide corrosion resistance. Preferably, the thickness of the corrosion-resistant stainless steel sheath is 0.2–0.3 mm.

[0045] In this embodiment, the air gap between the stainless steel sheath of the balance stator 7 and the stainless steel sheath of the balance rotor 8 is smaller than the annular gap between the impeller 2 and the pump body 1, thereby reducing the air gap and increasing the balancing force of the balance stator 7 and the balance rotor 8.

[0046] In this embodiment, a bearing assembly is provided on the pump shaft 14. The bearing assembly includes a bushing 13, a pair of sliding bearings 12 and a bearing seat 11, which are sequentially sleeved on the pump shaft 14 from the inside to the outside. The pair of sliding bearings 12 are respectively sleeved on both sides of the bushing 13.

[0047] In this embodiment, a first sealing gasket 5 is provided at the connection between the pump cover 4 and the pump body 1; a second sealing gasket 6 is provided at the connection between the pump cover 4 and the isolation sleeve 16.

[0048] In this embodiment, the rear cover plate of the impeller 2 is provided with back blades.

[0049] In this embodiment, the magnetic pump further includes a connector 9, which is connected to the outer end face of the isolation sleeve 16, and a third sealing gasket 10 is provided between the two.

[0050] In this embodiment, the magnetic pump further includes a connecting frame 18 disposed on the outside of the isolation sleeve 16. One end of the connecting frame 18 is connected to the pump body 1, and the other end is provided with a drive motor 19 connected to the outer rotor assembly 17.

[0051] Working principle:

[0052] In this embodiment, the axial force-free balanced magnetic pump operates by energizing the drive motor 19 to synchronously rotate the outer rotor assembly 17, thereby driving the inner rotor assembly 15 and the coaxial impeller 2 to rotate at high speed and generate pressure head. Due to the different sizes of the impeller 2 inlet and the through-shaft hub, the fluid force is unbalanced. Therefore, back blades are provided on the rear cover plate of the impeller 2 to balance the axial force. However, due to changes in operating conditions and machining dimensional accuracy issues during pump use, residual axial force balance may occur. When the residual axial force causes axial movement of the shaft, a relative displacement occurs between the balance stator 7 and the balance rotor 8. This displacement generates an attractive force between the balance stator 7 and the balance rotor 8, thereby achieving axial force balance without being affected by operating conditions or machining accuracy, thus achieving free axial force balance.

[0053] Specifically, the balance stator 7 and balance rotor 8 are assembled from multi-layered, multi-pole tile-shaped permanent magnets. The permanent magnets within the same layer use multiple magnets of the same pole, creating a repulsive structure, while adjacent layers use permanent magnets of different polarities, creating an attractive structure. There is no mechanical contact or friction between the balance stator 7 and balance rotor 8. The outer surfaces of the balance stator 7 and balance rotor 8 are covered with 0.2mm corrosion-resistant stainless steel sheaths, making them suitable for various operating conditions and corrosion-resistant. The air gap between the two stainless steel sheaths is designed to be smaller than the gap between the impeller 2 and the pump body 1, thereby reducing the air gap, increasing the balancing force of the balance stator 7 and balance rotor 8, and reducing manufacturing costs.

[0054] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A magnetic pump with free axial force balance, characterized in that, include: Pump cover (4) and pump body (1) together form a pump cavity; An isolation sleeve (16) is formed by enclosing the side of the pump body (1) away from the pump cover (4) to form an isolation cavity; A pump shaft (14) passing through the pump chamber and the isolation chamber; An impeller (2) is located inside the pump chamber and disposed at one end of the pump shaft (14); A balance rotor (8) and a balance stator (7) are located inside the isolation chamber and are sequentially mounted on the pump shaft (14). There is no mechanical contact between the balance rotor (8) and the balance stator (7). The inner rotor assembly (15) is located inside the isolation chamber and sleeved on the pump shaft (14); An outer rotor assembly (17) is located outside the isolation cavity and is disposed opposite to the inner rotor assembly (15).

2. The magnetic pump with axial force free balance according to claim 1, characterized in that, Both the balance stator (7) and the balance rotor (8) are assembled from multi-layered, multi-pole tile-shaped permanent magnets. The permanent magnets in the same layer are multiple permanent magnets with the same pole, forming a repulsive structure. The adjacent layers use permanent magnets with different polarities, forming an attractive structure. There is no mechanical contact or friction between the balance stator (7) and the balance rotor (8).

3. A magnetic pump with free axial force balance according to claim 1, characterized in that, The outer surfaces of the balance stator (7) and the balance rotor (8) are covered with corrosion-resistant stainless steel sheaths.

4. A magnetic pump with free axial force balance according to claim 3, characterized in that, The thickness of the corrosion-resistant stainless steel sheath is 0.2 to 0.3 mm.

5. A magnetic pump with free axial force balance according to claim 3, characterized in that, The air gap between the stainless steel sheath of the balance stator (7) and the stainless steel sheath of the balance rotor (8) is smaller than the annular gap between the impeller (2) and the pump body (1), thereby reducing the air gap and increasing the balancing force of the balance stator (7) and the balance rotor (8).

6. A magnetic pump with free axial force balance according to claim 1, characterized in that, The pump shaft (14) is provided with a bearing assembly, which includes a bushing (13), a pair of sliding bearings (12) and a bearing seat (11) sequentially sleeved on the pump shaft (14) from the inside to the outside. The pair of sliding bearings (12) are respectively sleeved on both sides of the bushing (13).

7. A magnetic pump with free axial force balance according to claim 1, characterized in that, A first sealing gasket (5) is provided at the connection between the pump cover (4) and the pump body (1).

8. A magnetic pump with free axial force balance according to claim 1, characterized in that, A second sealing gasket (6) is provided at the connection between the pump cover (4) and the isolation sleeve (16).

9. A magnetic pump with free axial force balance according to claim 1, characterized in that, The impeller (2) has a back blade on its rear cover plate.

10. A magnetic pump with free axial force balance according to claim 1, characterized in that, The magnetic pump is also equipped with a drive motor (19) connected to the outer rotor assembly (17).

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