Permanent magnet shielded pump axial magnetic field coreless magnet rotor

Abstract

This utility model belongs to the field of shielded pumps and relates to a coreless magnetic steel rotor for the axial magnetic field of a permanent magnet shielded pump. It includes: a rotating shaft, with a front ceramic layer and a rear ceramic layer formed by thermal spraying ceramic layers onto the front and rear middle sections of the shaft; an impeller mounted on one end of the rotating shaft; a ceramic ball bearing and a bearing pressure ring mounted on the other end of the rotating shaft; and a coreless magnetic steel rotor mounted on the rotating shaft. The advantages of this structure are: using a stainless steel shaft with thermally sprayed ceramic layers on the bearing positions effectively prevents and eliminates the drawbacks of traditional water bearings, such as short lifespan and easy wear, and ceramic shaft breakage due to overload impact from the medium.

Description

Technical Field

[0001] This utility model belongs to the field of shielded pump technology, specifically, it relates to a coreless magnetic steel rotor for the axial magnetic field of a permanent magnet shielded pump. Background Technology

[0002] Traditional permanent magnet shielded water pumps, also known as shielded pumps, are seal-free pumps that combine the functions of a motor and a pump. They transmit power through magnetic coupling, achieving a shaft seal-free design and thus avoiding leakage problems that may be caused by traditional mechanical seals.

[0003] However, traditional permanent magnet canned water pumps have the following main disadvantages: 1. Higher cost: Due to structural and material requirements, canned pumps are generally more expensive than traditional pumps, especially when handling high-temperature or high-pressure media. 2. Difficult maintenance: Once a canned pump malfunctions, professional disassembly and repair are usually required due to its complex internal structure, making self-repair very difficult for users. 3. Bearing lubrication issues: Bearings rely on the medium for lubrication; excessive impurities or incompatible properties in the medium can affect bearing life. 4. Power limitation: In high-power applications, the limitations of magnetic coupling can restrict power output.

[0004] Traditional axial flux motors possess a range of unique advantages and disadvantages, primarily reflected in their structural design, performance, and application scenarios. However, they also have the following drawbacks: 1. Cost: Axial flux motors are generally more expensive to manufacture than traditional radial flux motors, mainly due to the need for specific materials and manufacturing processes. For example, using a yokeless topology and specific stator-rotor designs increases costs. 2. Design and Manufacturing Complexity: The design and production of axial flux motors are typically more complex, requiring the maintenance of uniform air gap between the rotor and stator, which can present challenges in practice. Furthermore, manufacturing processes and equipment are less mature than those for radial motors, limiting the ability to achieve large-scale production. Utility Model Content

[0005] To address the aforementioned problems in the prior art, this utility model provides a coreless magnetic steel rotor for the axial magnetic field of a permanent magnet shielded pump.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] As one aspect of this utility model, a coreless magnetic steel rotor for an axial magnetic field of a permanent magnet shielded pump is proposed, comprising: a rotating shaft, wherein a front ceramic layer and a rear ceramic layer are formed by thermal spraying ceramic layers on the front middle part and the rear middle part of the rotating shaft; an impeller is installed on one end of the rotating shaft; a ceramic ball bearing is installed on the other end of the rotating shaft, and a bearing pressure ring is installed on the other end of the rotating shaft; and a coreless magnetic steel rotor is installed on the rotating shaft.

[0008] Furthermore, the material of the rotating shaft is stainless steel.

[0009] Furthermore, an impeller locking nut is threaded onto the side end of the rotating shaft, which locks the impeller onto the rotating shaft.

[0010] Furthermore, the coreless magnet rotor includes a magnet fixing disk, with a fixing disk mounting hole in the middle of the fixing disk, which is connected to the rotating shaft; the magnet fixing disk has 8 magnet mounting slots, which are arranged in a circular array around the fixing disk mounting hole; axial magnetic field magnets are installed in the magnet mounting slots; the two end faces of the axial magnetic field magnets are filled with waterproof insulating varnish to form an integrated waterproof disc-type axial coreless magnet rotor.

[0011] Furthermore, there is a preset gap of 0.5mm between the front surface of the axial magnetic field magnet and the front surface of the magnet fixing plate.

[0012] Furthermore, there is a preset gap of 0.5mm between the rear surface of the axial magnetic field magnet and the rear surface of the magnet fixing plate.

[0013] The permanent magnet shielded pump of this invention features an axial magnetic field without an iron core magnetic steel rotor. Its beneficial effects are specifically reflected in the following aspects: the use of a stainless steel shaft with a ceramic layer thermally sprayed onto the bearing position effectively prevents and eliminates the drawbacks of previous water bearings, such as short lifespan and easy wear, and ceramic shaft breakage due to overload impact from the medium. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0015] Figure 1 This is a schematic diagram of the axial magnetic field of the permanent magnet shielded pump of this utility model, showing a coreless magnetic steel rotor.

[0016] Figure 2 This is a cross-sectional view of the magnetic steel fixing plate of this utility model;

[0017] Figure 3 This is a side view of the structure of the magnetic steel fixing plate of this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] One embodiment of this application describes a permanent magnet shielded pump with an axial magnetic field without a core-free magnetic steel rotor, such as... Figure 1 As shown, it includes: a rotating shaft 221, the material of which is stainless steel; the front and rear middle parts of the rotating shaft 221 are thermally sprayed with ceramic layers to form a front ceramic layer 222 and a rear ceramic layer 223; it should be noted that the process of thermally spraying the ceramic layer is a known existing technology and will not be described in detail here; in use, the front ceramic layer 222 mates with a front silicon carbide bearing, and the rear ceramic layer 223 mates with a rear silicon carbide bearing; an impeller 224 is installed on one side of the rotating shaft 221, and in use, the impeller 224 is located in the impeller receiving cavity, the material of which is stainless steel; the rotating shaft 221... The impeller 224 is locked to the shaft 221 by a threaded connection on the side end of shaft 221. A ceramic ball bearing 226 is installed on the other side end of shaft 221, and a bearing pressure ring 227 is installed on the other side end of shaft 221. The bearing pressure ring 227 limits the ceramic ball bearing 226. A stainless steel shaft is used, and a ceramic layer is thermally sprayed onto the bearing position, which effectively prevents and eliminates the disadvantages of short life and easy wear of water bearings and the ceramic shaft breaking due to overload impact of the medium. A coreless magnetic steel rotor 228 is installed on shaft 221.

[0020] In one embodiment, such as Figures 1-3As shown, the coreless magnet rotor 228 includes a magnet fixing disk 2281, with a fixing disk mounting hole in the middle of the fixing disk 2281, which is connected to the rotating shaft 221; the magnet fixing disk 2281 has eight magnet mounting slots, which are arranged in a circular array around the fixing disk mounting hole; axial magnetic field magnets 2282 are installed in the magnet mounting slots; the two end faces of the axial magnetic field magnets 2282 are filled with waterproof insulating varnish 2283 to form an integrated waterproof disk-type axial coreless magnet rotor 228. The rotor has an iron core and a magnetic steel rotor. A 0.5mm pre-set gap exists between the front surface of the axial magnetic field magnet 2282 and the front surface of the magnet fixing plate 2281, and a 0.5mm pre-set gap exists between the rear surface of the axial magnetic field magnet 2282 and the rear surface of the magnet fixing plate 2281, serving as a glue storage space. The axial magnetic field magnet 2282 is integrally molded with the magnet fixing plate 2281 using injection molding technology, achieving corrosion-resistant shielding protection. The fixing plate mounting holes of the magnet fixing plate 2281 are interference-fitted onto the rotating shaft 221.

[0021] In this embodiment, a high-wear-resistant, long-life, and highly reliable bearing combination is formed by thermally spraying a ceramic layer onto a silicon carbide bearing and a stainless steel shaft. This combination is more reliable, lower in cost, easier to assemble, and easier to maintain than traditional plastic water bearings and ceramic shafts.

[0022] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "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.

[0024] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A coreless magnetic steel rotor for the axial magnetic field of a permanent magnet shielded pump, characterized in that, It includes: A rotating shaft (221) has a front ceramic layer (222) and a rear ceramic layer (223) formed at its front and rear middle parts; an impeller (224) is installed on one side of the rotating shaft (221); a ceramic ball bearing (226) is installed on the other side of the rotating shaft (221); a bearing pressure ring (227) is installed on the other side of the rotating shaft (221); and a coreless magnetic steel rotor (228) is installed on the rotating shaft (221).

2. The permanent magnet shielded pump with an axial magnetic field without an iron core magnet rotor as described in claim 1, characterized in that, The material of the rotating shaft (221) is stainless steel.

3. The permanent magnet shielded pump with an axial magnetic field without an iron core magnet rotor as described in claim 1, characterized in that, The side end of the rotating shaft (221) is threaded with an impeller locking nut (225), which locks the impeller (224) onto the rotating shaft (221).

4. The permanent magnet shielded pump with an axial magnetic field without an iron core magnet rotor as described in claim 1, characterized in that, The coreless magnet rotor (228) includes a magnet fixing disk (2281), with a fixing disk mounting hole in the middle of the magnet fixing disk (2281), which is connected to the rotating shaft (221); eight magnet mounting slots are provided on the magnet fixing disk (2281), and the eight magnet mounting slots are arranged in a ring array with the fixing disk mounting hole as the center; an axial magnetic field magnet (2282) is installed in the magnet mounting slot; waterproof insulating varnish (2283) is poured into both end faces of the axial magnetic field magnet (2282) to form an integrated waterproof disc-type axial coreless magnet rotor.

5. The permanent magnet shielded pump axial magnetic field coreless magnet rotor as described in claim 4, characterized in that, There is a 0.5mm preset gap between the front surface of the axial magnetic field magnet (2282) and the front surface of the magnet fixing plate (2281).

6. The permanent magnet shielded pump axial magnetic field coreless magnet rotor as described in claim 5, characterized in that, There is a preset gap of 0.5mm between the rear surface of the axial magnetic field magnet (2282) and the rear surface of the magnet fixing plate (2281).

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