High-efficiency energy-saving permanent magnet shielding type magnetic pump

Abstract

The utility model relates to a kind of high-efficiency energy-saving permanent-magnetic shielding magnetic drive pump, comprising: pump cover, pump body, both form pump cavity by enclosing;With the side of pump body away from pump cover enclosing isolation cavity's isolation sleeve;Pump shaft that penetrates pump cavity and isolation cavity;Located in pump cavity and set in the impeller of one end of pump shaft;Located in isolation cavity and set in the inner rotor on pump shaft, inner rotor includes the inner rotor seat that is set on pump shaft, inner rotor seat has a annular groove, yoke, permanent magnet are set in annular groove from inside to outside, the outer periphery of inner rotor seat is provided with sheath;Stator is located outside isolation cavity and is oppositely arranged with inner rotor.The utility model uses permanent-magnet synchronous motor to replace squirrel-cage asynchronous motor, efficiency is greatly improved, power factor is high, and energy-saving effect is remarkable;Among them, the permanent-magnet synchronous motor uses the inner rotor of magnetic drive pump to replace laminated pressure sheet, the coaxial structure of inner rotor and impeller, shorten the length of pump, reduce installation area.

Description

Technical Field

[0001] This utility model relates to the field of magnetic pump technology, specifically to a high-efficiency and energy-saving permanent magnet shielded magnetic pump. Background Technology

[0002] Magnetic drive pumps, due to their completely leak-free characteristics, are widely used in the transportation of various flammable, explosive, toxic, harmful, and valuable liquid media, making them a key piece of equipment for ensuring safe transportation in the industrial field. However, existing magnetic drive pumps still have significant shortcomings in terms of operating efficiency, energy consumption control, maintenance costs, and safety stability, which limits their further promotion and application.

[0003] Traditional magnetic drive pumps typically use squirrel-cage induction motors as their core drive mechanism. These motors usually rely on air cooling and use rolling bearings with ester lubrication. This results in low motor efficiency, a poor power factor, and insufficient energy savings. Furthermore, regular bearing maintenance and replacement increase equipment operating costs and downtime risks. Additionally, bearing cooling often depends on external cooling systems, which are cumbersome and further increase overall energy consumption. Structurally, traditional magnetic drive pumps often have separate motor rotors and impellers, leading to a larger overall pump length and increased installation space. Their working principle is as follows: the squirrel-cage induction motor drives the outer magnetic rotor, which in turn drives the inner rotor inside the pump to rotate synchronously, causing the impeller on the pump shaft to rotate and generate pressure head to transport the medium. Utility Model Content

[0004] The purpose of this utility model is to overcome at least one of the defects of the prior art and provide a high-efficiency and energy-saving permanent magnet shielded magnetic pump.

[0005] The objective of this utility model can be achieved through the following technical solutions: A high-efficiency and energy-saving permanent magnet shielded magnetic pump includes: The pump cover and pump body together form the pump cavity; An isolation sleeve that surrounds the side of the pump body opposite to the pump cover to form an isolation cavity; A pump shaft passing through the pump chamber and the isolation chamber; An impeller located inside the pump chamber and disposed at one end of the pump shaft; An inner rotor is located inside the isolation chamber and sleeved on the pump shaft. The inner rotor includes an inner rotor seat disposed on the pump shaft. The inner rotor seat has an annular groove. A yoke and a permanent magnet are disposed in the annular groove from the inside to the outside. A sleeve is disposed around the inner rotor seat. The stator is located outside the isolation cavity and is positioned opposite to the inner rotor.

[0006] Furthermore, the isolation sleeve is made of PEEK material with added carbon fiber, and the PEEK material with added carbon fiber can be PEEK CF30.

[0007] Furthermore, a bearing assembly is provided on the pump shaft, the bearing assembly including a pair of bushings sleeved on the pump shaft, a retainer sleeved on the pump shaft and located between the pair of bushings, a pair of sliding bearings disposed around the pair of bushings, and a bearing seat disposed around the pair of sliding bearings.

[0008] Furthermore, a pair of thrust bearings are also fitted onto the pump shaft, with the pair of thrust bearings located on both sides of the bearing housing.

[0009] Furthermore, the pump cover is provided with a first circulation hole, the bearing seat is provided with a second circulation hole, and the pump shaft is provided with a central hole. The pumped liquid is circulated sequentially through the first circulation hole, the second circulation hole, and the central hole.

[0010] Furthermore, an impeller nut is provided between the pump shaft and the impeller for connecting the two.

[0011] Furthermore, a stator housing is provided around the stator, and a rear cover is provided on the side of the stator housing opposite to the impeller.

[0012] Furthermore, a first sealing gasket is provided at the connection between the pump body and the pump cover; A second sealing gasket is provided at the connection between the pump cover and the isolation sleeve; A third sealing gasket is provided at the connection between the isolation sleeve and the stator housing; A fourth sealing gasket is provided at the connection between the stator housing and the rear cover.

[0013] Furthermore, a reinforcing sleeve is provided around the periphery of the isolation sleeve.

[0014] Furthermore, the magnetic pump also includes a base, which is disposed below the pump cover.

[0015] Compared with the prior art, the present invention has the following advantages: (1) This utility model provides a high-efficiency and energy-saving permanent magnet shielded magnetic pump. The magnetic pump uses a permanent magnet synchronous motor instead of a squirrel cage asynchronous motor, which greatly improves efficiency, has a high power factor, and has significant energy-saving effect. The permanent magnet synchronous motor uses the inner rotor of the magnetic pump instead of the stacked laminations. The inner rotor and impeller are coaxial, which shortens the length of the pump and reduces the installation area.

[0016] (2) This utility model provides a high-efficiency and energy-saving permanent magnet shielded magnetic pump. The pump body cavity of the pump is transported, and the liquid enters the first circulation hole of the pump cover through the high-pressure zone by the high-speed rotation of the impeller. Then, the liquid is circulated through the second circulation hole of the bearing seat and the center hole of the pump shaft, thereby lubricating and cooling the heat generated by the friction of the sliding bearing without the need for external circulating cooling liquid.

[0017] (3) This utility model provides a high-efficiency and energy-saving permanent magnet shielded magnetic pump. The isolation sleeve of the magnetic pump is made of PEEK material with added carbon fiber. It does not generate eddy current heat, has high pump efficiency, and the process of molding by high temperature mold is simple, with low manufacturing cost. It can be made on demand. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a high-efficiency, energy-saving permanent magnet shielded magnetic pump in the embodiment. Figure 2 This is a schematic diagram of the inner rotor in the embodiment; The numbers in the diagram indicate: 1-Pump body; 2-Impeller; 3-Impeller nut; 4-Pump shaft; 5-Pump cover; 6-Bearing housing; 7-Sliding bearing; 8-Shaft sleeve; 9-Side sleeve; 10-Thrust bearing; 11-Inner rotor; 12-Isolation sleeve; 13-Stator; 14-Stator housing; 15-Rear cover; 16-Bracket; 18-Reinforcing sleeve; 100-First sealing gasket; 101-Second sealing gasket; 102-Third sealing gasket; 103-Fourth sealing gasket; a-Enclosure; b-Permanent magnet; c-Yoke; d-Inner rotor seat; A-First circulation hole; B-Second circulation hole; C-Center hole. Detailed Implementation

[0019] 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.

[0020] Example This embodiment provides a high-efficiency and energy-saving permanent magnet shielded magnetic pump; the specific structure is shown below. Figure 1-2 ,include: Pump cover 5 and pump body 1 together form the pump cavity; An isolation sleeve 12 that surrounds the side of the pump body 1 away from the pump cover 5 to form an isolation cavity; Pump shaft 4 passing through the pump chamber and the isolation chamber; An impeller 2 is located inside the pump chamber and is disposed at one end of the pump shaft 4; An inner rotor 11 is located inside the isolation chamber and sleeved on the pump shaft 4. The inner rotor 11 includes an inner rotor seat d disposed on the pump shaft 4. The inner rotor seat d has an annular groove. A yoke c and a permanent magnet b are disposed from the inside to the outside in the annular groove. A sleeve a is disposed around the inner rotor seat d. The stator 13 is located outside the isolation cavity and is disposed opposite to the inner rotor 11.

[0021] In this embodiment, the isolation sleeve 12 is made of PEEK material with added carbon fiber. Compared with traditional metal or ordinary plastic isolation sleeves, the isolation sleeve 12 provided in this embodiment has the following advantages: (1) PEEK material itself has excellent chemical corrosion resistance. After being reinforced with carbon fiber, its acid and alkali resistance and organic solvent resistance are further improved, which can be adapted to a variety of corrosive conveying media and greatly expand the applicable scenarios of the pump body; (2) The addition of carbon fiber significantly enhances the mechanical strength and creep resistance of the isolation sleeve, which can withstand the pressure difference between the pump chamber and the isolation chamber, avoid the risk of deformation or rupture under high pressure conditions, and extend the service life of the isolation sleeve; (3) The composite material has a low coefficient of friction and a high surface finish, which can reduce the frictional resistance when the pump shaft 4 rotates, reduce mechanical energy consumption, and reduce the possibility of contamination of the conveying medium by impurities generated by friction. It is particularly suitable for clean conveying scenarios such as food and medicine.

[0022] In this embodiment, a bearing assembly is provided on the pump shaft 4. The bearing assembly includes a pair of bushings 8 sleeved on the pump shaft 4, a retaining sleeve 9 sleeved on the pump shaft 4 and located between the pair of bushings 8, a pair of sliding bearings 7 disposed around the pair of bushings 8, and a bearing seat 6 disposed around the pair of sliding bearings 7.

[0023] In this embodiment, a pair of thrust bearings 10 are also fitted on the pump shaft 4, and the pair of thrust bearings 10 are located on both sides of the bearing seat 6.

[0024] In this embodiment, the pump cover 5 is provided with a first circulation hole A, the bearing seat 6 is provided with a second circulation hole B, and the pump shaft 4 is provided with a center hole C. The pumped liquid is circulated sequentially through the first circulation hole A, the second circulation hole B, and the center hole C.

[0025] In this embodiment, an impeller nut 3 is provided between the pump shaft 4 and the impeller 2 to connect the two.

[0026] In this embodiment, a stator housing 14 is provided around the stator 13, and a rear cover 15 is provided on the side of the stator housing 14 away from the impeller 2.

[0027] In this embodiment, a first sealing gasket 100 is provided at the connection between the pump body 1 and the pump cover 5; a second sealing gasket 101 is provided at the connection between the pump cover 5 and the isolation sleeve 12; a third sealing gasket 102 is provided at the connection between the isolation sleeve 12 and the stator housing 14; and a fourth sealing gasket 103 is provided at the connection between the stator housing 14 and the rear cover 15.

[0028] In this embodiment, a reinforcing sleeve 18 is provided around the isolation sleeve 12.

[0029] In this embodiment, the magnetic pump also includes a base 17, which is disposed below the pump cover 5, and a bracket 16 is provided between the base 17 and the pump cover 5.

[0030] In this embodiment, the stator 13 is formed by stacking silicon steel sheets.

[0031] Working principle: This embodiment uses a permanent magnet shielded synchronous motor instead of a squirrel-cage asynchronous motor. The stator 13 of this synchronous motor is made of laminated silicon steel sheets, and the rotor 11 adopts the form of an internal rotor of a magnetic pump, eliminating the need for surface-mounted silicon steel sheets or embedded permanent magnets. The isolation sleeve 12 between the stator 13 and the rotor 11 is made of PEEK material with added carbon fiber. This material has high strength, high temperature resistance, and does not generate eddy current heat, which can significantly improve the efficiency of the pump.

[0032] When the motor stator 13 is connected to the power supply, the inner rotor 11 of the motor rotates synchronously, driving the coaxial impeller 2 to rotate, thereby realizing the liquid transportation. The transported liquid is sealed in the pump body 1 cavity and the isolation sleeve 12 cavity by the first sealing gasket 100 and the second sealing gasket 101, there is no dynamic seal, and no leakage will occur. The pump shaft 4 is sequentially equipped with the inner rotor 11, two thrust bearings 10, two shaft sleeves 8, a retaining sleeve 9, and the impeller 2, and the entire shaft system is locked with the impeller nut 3. Two sliding bearings 7 are installed on the bearing housing 6, forming friction pairs radially and axially with the shaft sleeves 8 and the thrust bearings 10, respectively. The sliding bearings 7 are made of pressureless sintered silicon carbide, and the shaft sleeves 8 and the thrust bearings 10 are made of hard alloy, which have the advantages of excellent corrosion resistance, high hardness, and good self-lubricating performance. When the liquid enters the pump body 1 cavity, it passes through the high-pressure zone via the high-speed rotation of the impeller 2 and enters the first circulation hole A of the pump cover 5. Then, it completes the circulation through the second circulation hole B of the bearing seat 6 and the center hole C of the pump shaft 4, thereby lubricating and cooling the heat generated by the friction of the sliding bearing without the need for external circulating cooling liquid.

[0033] 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 high-efficiency, energy-saving permanent magnet shielded magnetic pump, characterized in that, include: Pump cover (5) and pump body (1) together form the pump cavity; An isolation sleeve (12) is formed by enclosing the side of the pump body (1) away from the pump cover (5) to form an isolation cavity. Pump shaft (4) passing through the pump chamber and the isolation chamber; An impeller (2) is located inside the pump chamber and is disposed at one end of the pump shaft (4); An inner rotor (11) is located in the isolation chamber and sleeved on the pump shaft (4). The inner rotor (11) includes an inner rotor seat (d) disposed on the pump shaft (4). The inner rotor seat (d) has an annular groove. A yoke (c) and a permanent magnet (b) are disposed in the annular groove from the inside to the outside. A sleeve (a) is disposed around the inner rotor seat (d). The stator (13) is located outside the isolation cavity and is disposed opposite to the inner rotor (11).

2. The high-efficiency energy-saving permanent magnet shielded magnetic pump according to claim 1, characterized in that, The isolation sleeve (12) is made of PEEK material with added carbon fiber.

3. The high-efficiency energy-saving permanent magnet shielded magnetic pump according to claim 1, characterized in that, The pump shaft (4) is provided with a bearing assembly, which includes a pair of bushings (8) sleeved on the pump shaft (4), a retainer (9) sleeved on the pump shaft (4) and located between the pair of bushings (8), a pair of sliding bearings (7) disposed around the pair of bushings (8), and a bearing seat (6) disposed around the pair of sliding bearings (7).

4. The high-efficiency energy-saving permanent magnet shielded magnetic pump according to claim 3, characterized in that, A pair of thrust bearings (10) are also fitted on the pump shaft (4), and the pair of thrust bearings (10) are located on both sides of the bearing seat (6).

5. A high-efficiency energy-saving permanent magnet shielded magnetic pump according to claim 3, characterized in that, The pump cover (5) is provided with a first circulation hole (A), the bearing seat (6) is provided with a second circulation hole (B), and the pump shaft (4) is provided with a center hole (C). The pumped liquid is circulated sequentially through the first circulation hole (A), the second circulation hole (B), and the center hole (C).

6. The high-efficiency energy-saving permanent magnet shielded magnetic pump according to claim 1, characterized in that, An impeller nut (3) is provided between the pump shaft (4) and the impeller (2) for connecting the two.

7. The high-efficiency energy-saving permanent magnet shielded magnetic pump according to claim 1, characterized in that, The stator (13) is surrounded by a stator housing (14), and a rear cover (15) is provided on the side of the stator housing (14) away from the impeller (2).

8. A high-efficiency energy-saving permanent magnet shielded magnetic pump according to claim 7, characterized in that, A first sealing gasket (100) is provided at the connection between the pump body (1) and the pump cover (5). A second sealing gasket (101) is provided at the connection between the pump cover (5) and the isolation sleeve (12). A third sealing gasket (102) is provided at the connection between the isolation sleeve (12) and the stator housing (14). A fourth sealing gasket (103) is provided at the connection between the stator housing (14) and the rear cover (15).

9. A high-efficiency energy-saving permanent magnet shielded magnetic pump according to claim 1, characterized in that, The isolation sleeve (12) is surrounded by a reinforcing sleeve (18).

10. A high-efficiency, energy-saving permanent magnet shielded magnetic pump according to claim 1, characterized in that, The magnetic pump also includes a base (17) which is located below the pump cover (5).

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