Electromagnetic assisted helical magnetic force pump magnetic coupling device

Abstract

The utility model relates to a kind of electromagnetic auxiliary helical magnetic force pump magnetic coupling device, including pump body, impeller and main shaft, impeller is installed on the one side of main shaft in pump body;Inner magnetic rotor is installed on the other side of main shaft and is located in the closed cavity formed by the sealing connection of isolation plate and isolation sleeve, and outer magnetic rotor is installed on the outside of isolation sleeve;Several permanent magnets are installed on the outer wall of inner magnetic rotor with the first helical direction uniform distribution, several permanent magnets are installed on the outer wall of outer magnetic rotor with the second helical direction uniform distribution, to constitute the helical magnetic circuit structure of space staggered type multi-point coupling. Helical arrangement magnet structure realizes magnetic field coupling, with higher fault tolerance and stronger coupling redundancy ability, can effectively alleviate the coupling failure problem caused by permanent magnet installation position deviation or partial magnet demagnetization.

Description

Technical Field

[0001] This utility model relates to the field of fluid machinery technology, and in particular to an electromagnetically assisted helical magnetic pump magnetic coupling device. Background Technology

[0002] Magnetic drive pumps are leak-free pumps that utilize magnetic coupling to transmit power. They are widely used in environments with extremely high requirements for media sealing, such as chemical, pharmaceutical, semiconductor, electronics, and nuclear industries. These pumps mainly consist of a pump head, a magnetic drive (magnetic cylinder), a motor, and a base. The magnetic drive comprises an outer magnetic rotor, an inner magnetic rotor, and a non-magnetic isolation sleeve in between. The working principle of a magnetic drive pump is that the motor drives the outer magnetic rotor to rotate. The magnetic field penetrates the air gap and the isolation sleeve, driving the inner magnetic rotor, which is connected to the impeller, to rotate synchronously, thus achieving contactless power transmission. Because the pump shaft and inner magnetic rotor are completely enclosed within the pump body and isolation sleeve, magnetic drive pumps possess several significant advantages, such as eliminating dynamic seal leakage points and achieving a truly sealed structure; contactless transmission reduces mechanical wear, making them suitable for conveying flammable, explosive, toxic, and corrosive hazardous liquids; and a compact structure with low losses, reducing routine maintenance work such as shaft seal replacement and lubrication.

[0003] Research revealed that although magnetic pumps have been widely used in various fields, their magnetic drive structure still has certain limitations. One of the main problems is low magnetic flux coupling efficiency. In traditional magnetic pumps, the permanent magnets of the inner and outer magnetic rotors are usually arranged linearly in the axial or radial direction, resulting in a relatively simple magnetic circuit design. However, during operation, this can sometimes lead to uneven distribution of the magnetic flux path and limited coupling area, thereby reducing magnetic energy transfer efficiency and output torque capacity.

[0004] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create an electromagnetically assisted spiral magnetic pump magnetic coupling device, which would make it more valuable for industrial applications. Utility Model Content

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an electromagnetically assisted spiral magnetic pump magnetic coupling device.

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

[0007] An electromagnetically assisted spiral magnetic pump magnetic coupling device includes a pump body, an impeller, and a main shaft, wherein the impeller is mounted on one side of the main shaft inside the pump body;

[0008] The inner magnetic rotor is mounted on the other side of the main shaft and is located in a sealed cavity formed by the isolation plate and the isolation sleeve. The outer magnetic rotor is installed on the outside of the isolation sleeve.

[0009] Several permanent magnets are installed on the outer wall of the inner magnetic rotor in a uniformly distributed first helical direction, and several permanent magnets are installed on the outer wall of the outer magnetic rotor in a uniformly distributed second helical direction, thus forming a spatially interlaced multi-point coupled helical magnetic circuit structure.

[0010] Several coils are installed on the outer or inner wall of the isolation sleeve, and the isolation sleeve is a double-layered hollow structure, forming a closed cooling channel between the inner and outer layers. The cooling channel is connected to a coolant inlet and a coolant outlet.

[0011] As a further improvement of this utility model, sealing rings are installed at the connection interfaces between the isolation plate and the pump body, and between the isolation plate and the isolation sleeve.

[0012] As a further improvement of this utility model, in the spiral magnetic circuit structure, a permanent magnet with a spiral direction is coupled to at least two permanent magnets with opposite spiral directions to form a three-point or multi-point magnetic field closed structure.

[0013] As a further improvement of this utility model, the magnetic pole directions of the permanent magnets on the inner magnetic rotor and the outer magnetic rotor are alternately arranged along their length direction, and the magnetic pole directions of adjacent permanent magnets are opposite.

[0014] As a further improvement of this utility model, the coil is embedded in the isolation sleeve or wound and fixed on the isolation sleeve.

[0015] As a further improvement of this utility model, the coolant circulating in the cooling channel is powered by a hydraulic system driven by the pump itself or by an external independent cooling system.

[0016] As a further improvement of this utility model, the isolation plate is made of corrosion-resistant metal material and is fixedly installed on the pump body with fasteners.

[0017] As a further improvement of this utility model, the isolation sleeve is made of a high-strength and non-magnetic metal material.

[0018] As a further improvement of this utility model, the permanent magnet is a rare earth permanent magnet material.

[0019] By means of the above solution, this utility model has at least the following advantages:

[0020] 1. The spiral arrangement of magnets enables magnetic field coupling, which has higher fault tolerance and stronger coupling redundancy, and can effectively alleviate coupling failure caused by permanent magnet installation position deviation or partial magnet demagnetization.

[0021] 2. The composite magnetic circuit structure, through a multi-point distributed three-dimensional magnetic field, not only enhances the magnetic coupling strength but also strengthens the continuity and stability of the magnetic field in space. This effectively ensures the transmission synchronization and power consistency during rotation, thereby improving the energy efficiency and operational stability of the entire pump system.

[0022] 3. The one-to-many magnetic coupling mode between permanent magnets exhibits staggered multi-point coupling characteristics in space, significantly enhancing the traction capability of the magnetic field on the rotor. Even if some magnetic poles are not perfectly aligned, the magnetic field can be kept continuously closed through the complementary magnetic flux between adjacent permanent magnets, thereby ensuring stable system operation.

[0023] 4. The controllable excitation coil is set up to generate an auxiliary magnetic field by adjusting the energizing frequency, current and phase, which effectively compensates for the insufficient magnetic coupling caused by the opposite spiral directions of the inner and outer magnetic rotors.

[0024] 5. The isolation sleeve adopts a double-layer hollow structure, creating a cooling channel between the inner and outer layers. Low-temperature coolant can be introduced to effectively reduce the heat generated by the coil during long-term energization, preventing increased resistance or demagnetization of the permanent magnet due to high temperature. At the same time, it also forms a thermal buffer layer between the outer and inner magnetic rotors, suppressing temperature rise under high-speed operation and reducing thermal expansion, magnetic property drift, and mechanical deformation.

[0025] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the following are the preferred embodiments of this utility model and are described in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional structural schematic diagram of an electromagnetically assisted spiral magnetic pump magnetic coupling device according to the present invention;

[0028] Figure 2 yes Figure 1 Schematic diagram of the magnetic coupling relationship of permanent magnets;

[0029] Figure 3 yes Figure 1 Schematic diagram of the distribution structure of permanent magnets on the inner and outer magnetic rotors;

[0030] Figure 4 yes Figure 1A schematic diagram of the structure of the middle isolation sleeve.

[0031] The meanings of the labels in the figures are as follows.

[0032] 1-Pump body, 2-Impeller, 3-Main shaft, 4-Isolation plate, 5-Sealing ring, 6-Isolation sleeve, 7-Inner magnetic rotor, 8-Outer magnetic rotor, 9-Permanent magnet, 601-Coolant inlet, 602-Coolant outlet, 603-Coil. Detailed Implementation

[0033] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] The first embodiment of this utility model:

[0036] like Figures 1-4 As shown, this embodiment provides an electromagnetically assisted helical magnetic pump magnetic coupling device, thereby improving magnetic flux utilization, enhancing thermal stability, and optimizing structural performance. Firstly, the permanent magnets of the outer and inner magnetic rotors are arranged in left-hand and right-hand helical configurations along the axial direction, respectively, with staggered magnetic poles forming an interlaced magnetic flux path, which significantly enhances magnetic field coupling efficiency and improves torque transmission capability. Secondly, multiple annular segmented electromagnetic coils are evenly distributed outside the isolation sleeve, and an auxiliary magnetic field is formed through electronic control, effectively improving magnetic field strength and response speed, overcoming the performance bottleneck of traditional passive magnetic coupling. Furthermore, the isolation sleeve adopts a hollow structure, forming a cooling channel in the coil area. This channel connects to an external liquid cooling system for real-time heat dissipation, ensuring long-term stable operation of the system.

[0037] The magnetic coupling device of the spiral magnetic pump in this embodiment mainly includes a pump body 1, an impeller 2, a main shaft 3, an isolation plate 4, an isolation sleeve 6, an inner magnetic rotor 7, an outer magnetic rotor 8, and a permanent magnet 9.

[0038] Impeller 2 is mounted on one side of main shaft 3 inside pump body 1, and inner magnetic rotor 7 is mounted on the other side of main shaft 3 and located in a sealed cavity formed by the sealing connection of isolation plate 4 and isolation sleeve 6. Outer magnetic rotor 8 is installed on the outside of isolation sleeve 6. Sealing rings 5 ​​are installed at the connection interfaces between isolation plate 4 and pump body 1 and between isolation plate 4 and isolation sleeve 6, respectively.

[0039] The isolation plate 4 is made of corrosion-resistant metal material and is fixedly installed on the pump body 1 with fasteners, such as, but not limited to, 316L stainless steel, Hastelloy C-276 or Alloy 20.

[0040] The isolation sleeve 6 is made of a high-strength, non-magnetic metal material, such as, but not limited to, Hastelloy C-276, 316L stainless steel, or high-strength precipitation-hardening stainless steel.

[0041] Several permanent magnets 9 are installed on the outer wall of the inner magnetic rotor 7, which are evenly distributed in the first helical direction, and several permanent magnets 9 are installed on the outer wall of the outer magnetic rotor 8, which are evenly distributed in the second helical direction, thus forming a spatially interlaced multi-point coupled helical magnetic circuit structure.

[0042] In a spiral magnetic circuit structure, a permanent magnet 9 with a spiral direction is coupled to at least two permanent magnets 9 with opposite spiral directions to form a three-point or multi-point closed magnetic field structure.

[0043] The magnetic poles of the permanent magnets 9 on the inner magnetic rotor 7 and the outer magnetic rotor 8 are arranged alternately along their length, and the magnetic poles of adjacent permanent magnets 9 are opposite.

[0044] The permanent magnet 9 is a high-performance rare-earth permanent magnet material, such as, but not limited to, neodymium iron boron (NdFeB) or samarium cobalt (SmCo) magnets.

[0045] Several coils 603 are installed on the outer or inner wall of the isolation sleeve 6, and the isolation sleeve 6 is a double-layer hollow structure, forming a closed cooling channel between its inner and outer layers. The cooling channel is connected to a coolant inlet 601 and a coolant outlet 602.

[0046] The coil 603 is embedded in the isolation sleeve 6 or wound and fixed to the isolation sleeve 6.

[0047] The coolant circulating in the cooling channel is powered by a hydraulic system driven by the pump body 1 itself or by an external independent cooling system.

[0048] Through the above technical solutions, this embodiment not only achieves zero leakage and high reliability, but also solves key problems such as magnetic flux loss, heat accumulation and cooling difficulties, thereby improving the overall efficiency and service life of the magnetic pump. It is suitable for application scenarios with higher requirements for sealing, thermal stability and transmission efficiency.

[0049] The second embodiment of this utility model:

[0050] like Figure 1 The impeller 2 is mounted in the cavity of the pump body 1 by a fastening device and is fixedly connected to the axially arranged main shaft 3. One end of the main shaft 3 passes through the isolation plate 4 and is connected to the inner magnetic rotor 7. The isolation plate 4 is made of corrosion-resistant material and is installed on the pump body 1, with a sealing ring 5 between it and the pump body 1. The isolation sleeve 6 fits tightly with the isolation plate 4, and a sealing ring 5 is provided between them to ensure the sealing of the pump cavity and prevent leakage of the working medium. The isolation plate 4 effectively isolates the pump cavity from the drive cavity in structure, ensuring that the transmission components do not directly contact the conveyed medium. The inner magnetic rotor 7 is assembled in the sealed cavity formed by the isolation sleeve 6 and the isolation plate 4, and the inner magnetic rotor 7 is mounted on the main shaft.

[0051] like Figure 3 On the outer wall of the inner magnetic rotor 7, multiple permanent magnets 9 are equidistantly mounted. These permanent magnets 9 are uniformly distributed along the circumference in a right-hand (or left-hand) spiral manner, thus forming a continuous and stable rotating magnetic field. Correspondingly, on the outer magnetic rotor 8, which covers the outer casing 6, multiple permanent magnets 9 are also uniformly arranged along its outer wall, but these permanent magnets 9 are arranged in a spiral direction opposite to that of the inner magnets 7, i.e., left-hand (or right-hand) spiral. This arrangement of relative spiral directions helps to achieve more precise coupling and efficient transmission of magnetic forces.

[0052] Due to the difference in the helical arrangement of the permanent magnets 9 mounted on the inner magnetic rotor 7 and the outer magnetic rotor 8, their magnetic pole arrangement direction also changes, resulting in a magnetic field distribution that differs from the traditional axially aligned magnetic field structure. Specifically, the magnets are no longer arranged in a single axial configuration, but rather in a three-dimensional magnetic field structure with helical coupling characteristics, effectively improving the magnetic field envelope and transmission efficiency. Furthermore, the permanent magnets on the inner and outer magnetic rotors are not arranged in a single polarity configuration, but rather their magnetic pole directions are flexibly configured according to application requirements.

[0053] For example, a left-handed permanent magnet can be placed on the outer magnetic rotor, with its magnetic poles arranged from N to S from head to tail. Simultaneously, two right-handed permanent magnets are arranged on the inner magnetic rotor, magnetically coupled to the outer permanent magnet, with their magnetic poles arranged from S to N from head to tail. Therefore, the left-handed permanent magnet on the outer magnetic rotor (N pole in front, S pole behind) can simultaneously form stable magnetic flux channels with the S pole of the first right-handed permanent magnet and the N pole of the second right-handed permanent magnet on the inner magnetic rotor, achieving a three-point closed magnetic field structure.

[0054] Specifically, such as Figure 2As shown, the two permanent magnets are arranged in opposite directions, with one having its magnetic poles arranged from N to S from head to tail, and the other having its magnetic poles arranged from S to N from head to tail. Therefore, the permanent magnet with N in front and S in back can simultaneously form stable magnetic flux channels with the two permanent magnets with S in front and N in back, realizing a three-point closed magnetic field structure.

[0055] Similarly, depending on the arrangement of the permanent magnets, one left-handed (right-handed) permanent magnet can be coupled with three or more right-handed (left-handed) permanent magnets to form a composite magnetic circuit. This one-to-many helical magnetic circuit structure can achieve a more uniform magnetic flux distribution in space, forming a continuous and stable three-dimensional magnetic field channel, effectively improving the efficiency and stability of magnetic force transmission. Compared with the traditional axial distribution coupling structure, this one-to-many coupling method based on helical arrangement has significant advantages. Traditional axial arrangement methods usually rely on a one-to-one correspondence of permanent magnets in the axial direction. Once installation errors or magnetic pole asymmetry occur, it is easy for some permanent magnets to fail to form effective magnetic flux, resulting in local magnetic field mismatch, interruption of magnetic force transmission, or even system vibration.

[0056] In a spiral structure, the coupling relationship between permanent magnets is no longer a simple one-to-one relationship, but a spatially staggered multi-point coupling. Even if some magnetic poles are not fully aligned, the magnetic field can be continuously closed through the magnetic flux complementarity between adjacent permanent magnets.

[0057] In addition, since the permanent magnets installed on the outer magnetic rotor and the inner magnetic rotor are arranged in opposite directions of rotation, this difference in helical direction may lead to incomplete magnetic coupling in some areas. Especially in the initial stage of rotation or under high load conditions, phenomena such as reduced magnetic flux density and loss of coupling energy may occur.

[0058] like Figure 4 To improve the overall magnetic force transmission efficiency of the system, a series of coils 603 are installed on the outer surface or in the internal structure of the isolation sleeve 6, and the coils are precisely excited through an external controllable circuit connected to them. During operation, the coils 603 can adjust the energizing frequency, current intensity, and phase according to the real-time operating status, thereby forming an adjustable auxiliary magnetic field. This auxiliary magnetic field works together with the main magnetic field to enhance the local magnetic flux density and compensate for the insufficient magnetic field coupling caused by the difference in the rotation direction of the permanent magnets.

[0059] However, the coil inevitably generates a large amount of heat during prolonged operation. If heat dissipation is not effective, the coil temperature will rise, affecting its resistance characteristics, magnetic field stability, and even posing a risk of demagnetization to nearby permanent magnets. To address this issue, the isolation sleeve is designed as a double-layered hollow structure, with a closed cooling channel formed between the inner and outer layers. A coolant inlet pipe 601 and a coolant outlet pipe 602 on the isolation sleeve are connected to this channel. The coolant is driven by a pump and continuously circulates within the channel, promptly removing heat from around the coil and maintaining it within a stable operating temperature range. This cooling system not only effectively cools the coil but also indirectly facilitates heat exchange between the adjacent outer and inner magnetic rotors.

[0060] Since the rotor will also generate a certain amount of heat due to magnetic eddy currents or mechanical friction during high-speed operation, the existence of cooling channels helps to suppress the overall rise in internal temperature of the system, reduce material thermal expansion, magnetic property drift or mechanical deformation caused by temperature changes, thereby significantly improving the operational stability and service life of the entire magnetic drive system.

[0061] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0062] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0063] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An electromagnetically assisted spiral magnetic pump magnetic coupling device, comprising a pump body (1), an impeller (2) and a main shaft (3), wherein the impeller (2) is mounted on one side of the main shaft (3) inside the pump body (1); Its features are: The inner magnetic rotor (7) is mounted on the other side of the main shaft (3) and located in a sealed cavity formed by the isolation plate (4) and the isolation sleeve (6). An outer magnetic rotor (8) is mounted on the outside of the isolation sleeve (6). Several permanent magnets (9) are installed on the outer wall of the inner magnetic rotor (7) in a first spiral direction, and several permanent magnets (9) are installed on the outer wall of the outer magnetic rotor (8) in a second spiral direction, thereby forming a spatially interlaced multi-point coupled spiral magnetic circuit structure. A plurality of coils (603) are installed on the outer or inner wall of the isolation sleeve (6), and the isolation sleeve (6) is a double-layer hollow structure, forming a closed cooling channel between its inner and outer layers, and a coolant inlet (601) and a coolant outlet (602) are connected to the cooling channel.

2. The electromagnetically assisted spiral magnetic pump magnetic coupling device as described in claim 1, characterized in that, Sealing rings (5) are installed at the connection interfaces between the isolation plate (4) and the pump body (1) and between the isolation plate (4) and the isolation sleeve (6).

3. The electromagnetically assisted spiral magnetic pump magnetic coupling device as described in claim 1, characterized in that, In the spiral magnetic circuit structure, a permanent magnet (9) with a spiral direction is coupled to at least two permanent magnets (9) with opposite spiral directions to form a three-point or multi-point magnetic field closed structure.

4. The electromagnetically assisted spiral magnetic pump magnetic coupling device as described in claim 1, characterized in that, The magnetic poles of the permanent magnets (9) on the inner magnetic rotor (7) and the outer magnetic rotor (8) are arranged alternately along their length, and the magnetic poles of adjacent permanent magnets (9) are opposite.

5. The electromagnetically assisted spiral magnetic pump magnetic coupling device as described in claim 1, characterized in that, The coil (603) is embedded in the isolation sleeve (6) or wound and fixed on the isolation sleeve (6).

6. The electromagnetically assisted spiral magnetic pump magnetic coupling device as described in claim 1, characterized in that, The coolant circulating in the cooling channel is powered by a hydraulic system driven by the pump body (1) itself or by an external independent cooling system.

7. The electromagnetically assisted spiral magnetic pump magnetic coupling device as described in claim 1, characterized in that, The isolation plate (4) is made of corrosion-resistant metal material and is fixedly installed on the pump body (1) by fasteners.

8. The electromagnetically assisted spiral magnetic pump magnetic coupling device as described in claim 1, characterized in that, The isolation sleeve (6) is made of a high-strength, non-magnetic metal material.

9. The electromagnetically assisted spiral magnetic pump magnetic coupling device as described in claim 1, characterized in that, The permanent magnet (9) is a rare earth permanent magnet material.

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