Magnetic drive leak-proof shaftless impeller pump

Abstract

The application discloses a magnetic driving leak-proof shaftless impeller pump. The shaftless impeller pump comprises a motor stator, a magnetic conducting pipe arranged in the motor stator, a plurality of groups of magnetic conducting blocks embedded in the pipe wall of the magnetic conducting pipe, an integrated rotor shaftless impeller located in the magnetic conducting pipe, a neodymium iron permanent magnet corresponding to the magnetic conducting blocks, self-lubricating bearings and bearing end covers arranged at the end of the magnetic conducting pipe. The positions of the magnetic conducting blocks and the coil positions of the motor stator are one-to-one corresponding. The integrated rotor shaftless impeller rotates freely around the pipe center axis of the magnetic conducting pipe, and the neodymium iron permanent magnet is embedded in the rim of the integrated rotor shaftless impeller. The application realizes absolute isolation and sealing between the motor stator and the integrated rotor, avoids the infiltration of the transported fluid medium into the motor stator part, realizes the high-efficiency magnetic force transmission process, and effectively solves the problems of low driving efficiency, difficult sealing between the stator and the rotor and easy leakage of the existing integrated shaftless impeller pump.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery, and in particular to a magnetically driven, leak-proof, shaftless impeller pump. Background Technology

[0002] Referring to patent designs with application numbers 201210102763, 201520956584, 201910630617, and 202011497951, it can be seen that in current shaftless impeller pump technology, the shaftless impeller is combined with the motor rotor into an integrated structure, thereby achieving the shaftless operation effect of the impeller pump, which is a relatively advanced pump body design scheme.

[0003] However, a significant problem exists in the aforementioned design that integrates the rotor and impeller: because the impeller and motor rotor are integrated into one unit, the fluid medium being pumped inevitably wets the rotor. Furthermore, due to the requirements of motor efficiency and electromagnetic torque transmission, the air gap between the rotor and stator in this integrated design should be as small as possible. Within this extremely small gap, it is difficult to achieve complete isolation and sealing between the rotor and stator. Therefore, the fluid medium being pumped easily wets the motor stator, leading to anything from minor material leakage hindering the normal operation of the pump to severe short circuits causing motor burnout, thus hindering the widespread application of integrated shaftless impeller pumps. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a magnetically driven, leak-proof, shaftless impeller pump that achieves absolute isolation and sealing between the motor stator and the fused rotor, preventing the fluid medium being pumped from wetting the motor stator, and achieving stable, reliable, and efficient operation of the pump body.

[0005] A magnetically driven, leak-proof, shaftless impeller pump, including a motor stator;

[0006] The shaftless impeller pump also includes:

[0007] A magnetic conduit is fixedly sleeved inside the motor stator;

[0008] Several sets of magnetically conductive blocks are embedded in the wall of the magnetically conductive pipe; wherein the positions of the magnetically conductive blocks correspond one-to-one with the positions of the coils of the motor stator.

[0009] The integrated shaftless rotor impeller located inside the magnetically conductive pipe can rotate freely around the central axis of the pipe.

[0010] A self-lubricating bearing is fitted onto the integrated rotor shaftless impeller; and a neodymium iron permanent magnet corresponding to the magnetic guide block is embedded in the rim of the integrated rotor shaftless impeller.

[0011] The aforementioned shaftless impeller pump achieves absolute isolation and sealing between the motor stator and the integrated rotor, preventing the transported fluid medium from wetting the motor stator. This enables a highly efficient magnetic force transmission process and effectively solves the problems of low drive efficiency and difficulty in sealing between the stator and rotor in existing integrated shaftless impeller pumps, which are prone to leakage.

[0012] In one embodiment, a wedge-shaped mounting hole is provided in the wall of the magnetic conduit, which fits with the magnetic block; an adhesive sealing layer is provided in the wedge-shaped mounting hole, which fills the space between the magnetic conduit and the magnetic block.

[0013] Furthermore, the opening of the wedge-shaped mounting hole facing the inner wall of the magnetic guide pipe has a larger size than the opening facing the outer wall of the magnetic guide pipe.

[0014] In one embodiment, several groups of magnetically conductive blocks are evenly arranged around the pipe wall, and the number of magnetically conductive blocks is the same as the number of slots in the motor stator coil.

[0015] Furthermore, the magnetic block is prepared by bundling multiple silicon steel strips coated with insulating varnish.

[0016] In one embodiment, the number of self-lubricating bearings is two sets, and the two sets of self-lubricating bearings are horizontally arranged at both ends of the integrated rotor shaftless impeller; the inner ring of the self-lubricating bearing is fitted with the integrated rotor shaftless impeller.

[0017] Furthermore, the integrated rotor shaftless impeller has shaftless impeller blades attached to the inner wall.

[0018] In one embodiment, the shaftless impeller pump further includes a bearing end cap disposed at the end of the magnetic conduit, which is fixed to the outer ring of the self-lubricating bearing.

[0019] Furthermore, the bearing end cap and the magnetic conduit are fixed together by bolts.

[0020] Furthermore, the magnetic conduit, the integrated rotor shaftless impeller, the self-lubricating bearing, and the bearing end cover are all made of insulating non-ferromagnetic material.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention adopts an integrated design of motor and pump body, eliminating the coupling, resulting in a simple and compact structure. Furthermore, it employs a unique magnetic channel design to completely isolate the stator and rotor, ensuring that the fluid medium being transported will not come into contact with the stator or leak into the environment outside the pump body. This completely solves other problems caused by medium leakage and is suitable for transporting various toxic, harmful, flammable, and explosive hazardous fluid media.

[0023] The present invention has a simple structure, is easy to install and miniaturize, does not change the flow direction of the conveyed fluid medium, has higher energy efficiency, and the shaftless impeller pump of the present invention can be directly connected to the conveying pipeline through flanges at both ends, thereby facilitating series use in long-distance conveying pipelines and saving installation space.

[0024] The shaftless impeller pump of the present invention adopts a central shaftless impeller design, which will not be entangled or blocked by possible solid substances in the medium. It is very suitable for conveying fluid media of the solid-liquid mixture type and has functions that ordinary magnetic pumps do not have at all. Attached Figure Description

[0025] Figure 1 The diagram shown is a structural schematic of a magnetically driven, leak-proof, shaftless impeller pump provided by the present invention.

[0026] Figure 2 As shown Figure 1 Exploded view.

[0027] Figure 3 As shown Figure 2 A structural diagram of a medium-conducting magnetic pipe.

[0028] Figure 4 As shown Figure 3 A structural diagram of the intermediate magnetic block.

[0029] Figure 5 As shown Figure 2 A structural diagram of a shaftless impeller integrated rotor.

[0030] Figure 6 As shown Figure 1 Axial half-sectional view.

[0031] Figure 7 As shown Figure 6 A magnified view of A in the middle.

[0032] Figure 8 As shown Figure 1 A radial half-section view.

[0033] Explanation of main component symbols

[0034] 1. Motor stator; 2. Magnetic guide tube; 3. Magnetic guide block; 4. Integrated rotor shaftless impeller; 5. Neodymium iron permanent magnet; 6. Self-lubricating bearing; 7. Bearing end cover.

[0035] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a more detailed explanation of the present invention. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings.

[0037] Please see Figure 1-2 This embodiment provides a magnetically driven, leak-proof, shaftless impeller pump, which includes a motor stator 1, a magnetically conductive pipe 2 fixedly sleeved in the motor stator 1, a plurality of magnetically conductive blocks 3 embedded in the pipe wall of the magnetically conductive pipe 2, an integrated rotor shaftless impeller 4 located in the magnetically conductive pipe 2, neodymium iron permanent magnets 5 corresponding to the magnetically conductive blocks 3, a self-lubricating bearing 6 sleeved on the integrated rotor shaftless impeller 4, and a bearing end cap 7 arranged at the end of the magnetically conductive pipe 2.

[0038] The magnetic conduit 2, the integrated rotor shaftless impeller 4, the self-lubricating bearing 6, and the bearing end cover 7 are all made of insulating non-ferromagnetic material. The operating principle of the shaftless impeller pump in this embodiment is as follows: When the motor stator 1 is energized, it generates a rotating magnetic field. The iron core and magnetic block 3 of the motor stator 1 concentrate the magnetic field and conduct it into the interior of the magnetic conduit 2. The neodymium iron permanent magnet 5 on the integrated rotor shaftless impeller 4 is forced to rotate synchronously by the rotating magnetic field, thereby driving the integrated rotor shaftless impeller 4 to rotate.

[0039] Please continue reading. Figure 3 The magnetic conduit 2 has a wedge-shaped mounting hole in its wall, which fits into the magnetic block 3. A sealing layer is provided inside the wedge-shaped mounting hole, filling the space between the magnetic conduit 2 and the magnetic block 3. To ensure the structural airtightness of the magnetic conduit 2, the sealing layer is used to seal the inside and outside of the wedge-shaped mounting hole. The magnetic block 3 is firmly and tightly embedded in the magnetic conduit 2, forming a completely sealed pipe inside the magnetic conduit 2 that does not come into contact with the fluid medium being transported. In this embodiment, the opening size of the wedge-shaped mounting hole facing the inner wall of the magnetic conduit 2 is larger than the opening facing the outer wall of the magnetic conduit 2. Structurally, it is wedge-shaped from the inside out to provide the corresponding positioning for the magnetic block 3. Guided by the wedge-shaped mounting hole, when installing the magnetic block 3, it is pressed in from the inside to the outside of the pipe to achieve precise and convenient assembly.

[0040] Several groups of magnetically conductive blocks 3 are evenly distributed around the pipe wall, and the number of magnetically conductive blocks 3 is the same as the number of coil slots of the motor stator 1. The positions of the magnetically conductive blocks 3 correspond one-to-one with the coil positions of the motor stator 1. Please refer to the relevant documentation. Figure 4 The magnetic block 3 is made by bundling multiple silicon steel strips coated with insulating varnish. It is a wedge-shaped frustum with one end larger than the other, and the cross-section of the silicon steel strips is no greater than 1 mm. 2 The square shape, based on silicon steel strips coated with insulating varnish, effectively reduces eddy current losses generated when the magnetic block 3 conducts the magnetic field, thereby overcoming the heat generation problem caused by eddy current effect, improving operating efficiency, and reducing pump body heat generation.

[0041] In this embodiment, the magnetic conduit 2 and the magnetic block 3 are assembled together. The magnetic conduit 2, which is embedded with the wedge-shaped magnetic block 3, completely seals the inside of the pump body, forming a unique magnetic channel design that prevents the fluid medium being transported from leaking to the outside of the magnetic conduit 2.

[0042] In this embodiment, the motor (motor stator 1) and pump body (integrated rotor shaftless impeller 4) are integrated into one unit and isolated by a unique magnetic channel design, eliminating the leakage problem of the conveyed fluid medium. At the same time, the magnetic block 3 on the magnetic channel is used to improve energy utilization efficiency, so that the rotating magnetic field generated by the motor stator 1 can be efficiently conducted to the inside of the magnetic channel, thereby driving the integrated rotor shaftless impeller 4 to work. This effectively solves the problems of the conveyed fluid medium easily wetting the motor stator 1 during the operation of the integrated shaftless impeller pump, causing motor short circuits and damage to the pump body components, etc., improving the adaptability and service life of the pump, and making the shaftless impeller pump operate more smoothly, reliably and efficiently.

[0043] In this embodiment, the motor and pump body are integrated into one design, eliminating the coupling. The structure is simple and compact. Furthermore, a unique magnetic channel design is used to completely isolate the stator and rotor, ensuring that the fluid medium being transported will not come into contact with the stator or leak into the environment outside the pump body. This completely solves other problems caused by medium leakage and is suitable for transporting various toxic, harmful, flammable, and explosive hazardous fluid media.

[0044] Please refer to the following: Figure 5 The integrated rotor shaftless impeller 4 has shaftless impeller blades attached to its inner wall. The integrated rotor shaftless impeller 4 rotates freely around the central axis of the magnetically conductive pipe 2. The neodymium iron permanent magnet 5 is embedded in the rim of the integrated rotor shaftless impeller 4. In this embodiment, the neodymium iron permanent magnet 5 is glued to the outer rim of the integrated rotor shaftless impeller 4, making the two a single unit, i.e., a fused rotor. It should be noted that, due to the requirements of motor efficiency and electromagnetic torque transmission, the air gap between the rotor and stator of the shaftless impeller pump in this embodiment should be as small as possible; that is, the air gap between the neodymium iron permanent magnet 5 and the magnetically conductive pipe 2 should not exceed 0.5 mm.

[0045] In this embodiment, the integrated rotor shaftless impeller 4 serves as the moving part of the pump body. It adopts a shaftless design, that is, neodymium iron permanent magnets 5 are embedded in the outer rim of the integrated rotor shaftless impeller 4, while the impeller blades are embedded in the inner wall. Based on the magnetic guide block 3, the magnetic torque generated by the motor stator 1 is efficiently transmitted to the inside of the magnetic guide pipe 2, thereby driving the integrated rotor shaftless impeller 4 with neodymium iron permanent magnets 5 to rotate, so as to achieve shaftless operation. This prevents it from being entangled or blocked by possible solid substances in the medium, making it very suitable for conveying fluid media of the solid-liquid mixture type. It has functions that ordinary magnetic pumps do not have at all.

[0046] Please continue reading. Figure 6-8 The self-lubricating bearings 6 are in two sets, horizontally arranged at both ends of the integrated shaftless impeller 4. The bearing end caps 7 are fixed to the outer rings of the self-lubricating bearings 6, and are connected to the magnetically conductive pipe 2 using bolts. To facilitate connection between the magnetically conductive pipe 2 and other pipes or fittings, this embodiment uses a magnetically conductive pipe 2 with flanges at both ends as an example. The inner rings of the self-lubricating bearings 6 mate with the integrated shaftless impeller 4. The self-lubricating bearings 6 are supported and fixed at both ends of the integrated shaftless impeller 4, and the bearing end caps 7 facilitate the assembly of the integrated shaftless impeller 4 within the magnetically conductive pipe 2.

[0047] In this embodiment, during installation and operation, the integrated rotor shaftless impeller 4 is supported by the self-lubricating bearing 6, which prevents the integrated rotor shaftless impeller 4 from moving axially and radially within the magnetic guide pipe 2, thereby ensuring the smooth operation of the integrated rotor shaftless impeller 4.

[0048] The shaftless impeller pump of this embodiment has a simple structure, is easy to install and miniaturize, does not change the flow direction of the conveyed fluid medium, has higher energy efficiency, and its two ends can be directly connected to the conveying pipeline through flanges, thus facilitating series use in long-distance conveying pipelines and saving installation space.

[0049] In summary, the shaftless impeller pump of this embodiment has the following advantages compared with the existing integrated shaftless impeller pump: The shaftless impeller pump of this embodiment adopts a unique magnetic channel design in its structure, which realizes absolute isolation and sealing between the motor stator and the fused rotor (integrated rotor shaftless impeller 4), realizes a highly efficient magnetic force transmission process, and effectively solves the problems of low driving efficiency and difficulty in sealing and easy leakage between the stator and rotor in the existing integrated shaftless impeller pump.

[0050] The naming of each component is based on its function as described in the specification, and is not limited to the specific terms used in this invention. Those skilled in the art may also choose other terms to describe the names of the components of this invention.

Claims

1. A magnetically driven, leak-proof, shaftless impeller pump, comprising a motor stator (1); Its features are, The shaftless impeller pump also includes: The magnetic conduit (2) is fixedly sleeved inside the motor stator (1); Several sets of magnetic blocks (3) are embedded in the wall of the magnetic conduit (2); wherein the position of the magnetic block (3) corresponds one-to-one with the position of the coil of the motor stator (1); the magnetic block (3) is made by bundling multiple silicon steel strips coated with insulating paint. The integrated rotor shaftless impeller (4) located inside the magnetic conduit (2) rotates freely around the central axis of the conduit; A self-lubricating bearing (6) fitted onto the integrated rotor shaftless impeller (4); and The neodymium iron permanent magnet (5) corresponding to the magnetic block (3) is embedded in the rim of the integrated rotor shaftless impeller (4); The magnetic conduit (2) has a wedge-shaped mounting hole on its wall, which fits into the magnetic block (3); the wedge-shaped mounting hole is filled with an adhesive sealing layer, which fills the space between the magnetic conduit (2) and the magnetic block (3).

2. The magnetically driven, leak-proof, shaftless impeller pump according to claim 1, characterized in that, The opening of the wedge-shaped mounting hole on the inner wall of the magnetic guide pipe (2) is larger than the opening on the outer wall of the magnetic guide pipe (2).

3. The magnetically driven, leak-proof, shaftless impeller pump according to claim 1, characterized in that, Several sets of magnetic conductive blocks (3) are evenly arranged around the pipe wall, and the number of magnetic conductive blocks (3) is the same as the number of slots of the motor stator (1) coil.

4. The magnetically driven, leak-proof, shaftless impeller pump according to claim 1, characterized in that, The number of self-lubricating bearings (6) is two sets, and the two sets of self-lubricating bearings (6) are horizontally arranged at both ends of the integrated rotor shaftless impeller (4); the inner ring of the self-lubricating bearing (6) and the integrated rotor shaftless impeller (4) are fitted together.

5. A magnetically driven, leak-proof, shaftless impeller pump according to claim 4, characterized in that, The integrated rotor shaftless impeller (4) has shaftless impeller blades attached to the inner wall.

6. A magnetically driven, leak-proof, shaftless impeller pump according to claim 1, characterized in that, The shaftless impeller pump also includes a bearing end cap (7) installed at the end of the magnetic conduit (2), which is fixed to the outer ring of the self-lubricating bearing (6).

7. A magnetically driven, leak-proof, shaftless impeller pump according to claim 6, characterized in that, The bearing end cap (7) and the magnetic conduit (2) are fixed together by bolts.

8. A magnetically driven, leak-proof, shaftless impeller pump according to claim 7, characterized in that, The magnetic conduit (2), the integrated rotor shaftless impeller (4), the self-lubricating bearing (6), and the bearing end cover (7) are all made of insulating non-ferromagnetic material.

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