Compact magnetic drive pump based on magnetic gear composite motor

Abstract

The invention provides a compact magnetic drive pump based on a magnetic gear composite motor. The compact magnetic drive pump comprises a pump body, an impeller, a pump body support, inner magnetic steel, an outer stator, a winding, a magnetism adjusting ring, a shaft, an isolation sleeve, an impeller and the like. The magnetic gear composite motor is used as a drive of the magnetic drive pump impeller, sine alternating current is introduced into the motor winding, the inner magnetic steel rotor is driven to rotate by means of the magnetic field modulation effect, and liquid conveying is achieved. And through magnetic field modulation of the magnetic adjusting ring, the output torque or the rotating speed can be multiplied, and the direct drive structure is suitable for large torque or high speed. The direct drive structure replaces a motor and magnetic coupling series connection structure, and the occupied space of equipment can be effectively reduced. By adjusting the relation between the number of pole pairs of the permanent magnets and the number of pole pairs of the windings, a high-rotating-speed and high-torque double-type magnetic drive pump structure is obtained. Meanwhile, due to the magnetic field modulation effect and the only rotor, the isolation sleeve and the magnetism adjusting ring can be directly and fixedly connected or integrally formed, the strength of the isolation sleeve is greatly enhanced, and it is guaranteed that the magnetic drive pump stably works under high power.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic pumps, and in particular to a compact magnetic pump based on a magnetic gear composite motor. Background Art

[0002] The magnetic pump is a product that applies the working principle of the permanent magnetic coupling to the centrifugal pump. It has the characteristics of full sealing, no leakage, and corrosion resistance. It is widely used in the transportation of various liquids in the chemical, smelting, environmental protection and other industries. At present, the magnetic pump consists of three parts: a pump, a permanent magnetic coupling, and an electric motor. The magnetic transmission of the magnetic pump consists of an outer magnetic rotor, an inner magnetic rotor, and a non-magnetic isolation sleeve. When the motor drives the outer magnetic rotor to rotate, the magnetic field can penetrate the air gap and non-magnetic materials, driving the inner magnetic rotor connected to the impeller to rotate synchronously, realizing contactless synchronous transmission of power. However, since the three parts are connected in series in sequence, the working space occupied is large, and due to the existence of the inner and outer rotors, the isolation sleeve between the rotors cannot be effectively strengthened from a structural perspective. In general, in order to obtain a larger output torque and the power of the whole machine, the air gap thickness between the inner magnetic rotor and the isolation sleeve is within 2mm, and the strength of the isolation sleeve is further affected.

[0003] The magnetic gear composite motor organically combines two electromagnetic devices, magnetic gear and permanent magnet motor. Sinusoidal alternating current is passed into the motor winding, and the inner magnetic steel rotor is driven to rotate by the magnetic field modulation effect. The magnetic field is modulated by the magnetic ring and the number of magnetic poles of the inner magnetic steel is changed, so that the output torque or speed is multiplied. It is a direct drive structure suitable for large torque or high speed. By replacing the series structure of the motor and the magnetic coupling with this direct drive structure, the space occupied by the equipment can be effectively reduced. Due to the magnetic field modulation effect and only one inner magnetic steel rotor, the strength of the isolation sleeve can be greatly enhanced by setting a reinforcement sleeve between the isolation sleeve and the magnetic ring, or directly connecting the isolation sleeve to the magnetic ring, so as to ensure the smooth operation of the magnetic pump under high power. Summary of the invention

[0004] In view of the above-mentioned technical problems that the existing magnetic pumps occupy a large space and have low strength of the isolation sleeve under high power, a compact magnetic pump based on a magnetic gear composite motor is provided. The present invention mainly introduces a magnetic gear composite motor structure, and uses the magnetic conductive part of the magnetic adjustment device to modulate the number of magnetic poles of the harmonic magnetic density of the outer stator winding into the number of magnetic poles of the harmonic magnetic density of the inner rotor permanent magnet. The winding is coupled with the inner rotor permanent magnet by equal magnetic poles to output torque and power. Due to the direct drive structure, the structure is compact, and the motor and magnetic coupling structure can be eliminated. At the same time, the isolation sleeve can be fixedly connected to the magnetic adjustment ring, and the strength of the isolation sleeve can be further enhanced, so that the stable operation of the magnetic pump under high power can be achieved.

[0005] The technical means adopted by the present invention are as follows:

[0006] A compact magnetic pump based on a magnetic gear composite motor comprises: a pump body, a pump body bracket, an inner magnetic steel, an outer stator, a winding, an end cover, a magnetic adjustment ring, a spacer sleeve, a shaft and an impeller. The pump body is fixedly connected to one side of the pump body bracket to form a magnetic pump body; the other side of the pump body bracket is fixedly connected to the end cover, the interior of the pump body and the pump body bracket constitutes a first accommodating chamber, and the interior of the pump body bracket and the end cover constitutes a second accommodating chamber;

[0007] The middle position of the shaft is rotatably connected to the pump body bracket, and one side of the shaft is located in the first accommodating chamber, and the other side is located in the second accommodating chamber; the inner magnetic steel, the outer stator, the winding, the magnetic adjustment ring, and the isolation sleeve are all placed in the second accommodating chamber;

[0008] The impeller is connected to one end of the shaft and is located in the first accommodating chamber, the other end of the shaft is rotatably connected to one side of the isolation sleeve, the other side of the isolation sleeve is connected to the pump body support through a sealing ring to form a sealed chamber, and the inner magnetic steel is connected to the shaft and is located in the sealed chamber;

[0009] The magnetic adjustment ring is fixed on the end cover, the outer stator is fixed on the pump body bracket through a slot, and the winding is wound in the slot of the outer stator; the inner magnetic steel, the isolation sleeve, the magnetic adjustment ring, and the outer stator are arranged in sequence from the inside to the outside.

[0010] Furthermore, the impeller is connected and fixed to the shaft via a flat key.

[0011] Furthermore, the shaft is connected to the inner magnetic steel via a key, and the inner magnetic steel is axially fixed via a sleeve B and a sleeve C disposed on both sides of the inner magnetic steel.

[0012] Furthermore, the middle position of the shaft is connected to the pump body bracket through the shaft sleeve A and the front bearing arranged inside and outside, and the axial fixation of the pump body bracket is achieved through the shaft shoulders and thrust rings arranged on both sides.

[0013] Furthermore, the other end of the shaft is connected to an isolation sleeve through a shaft sleeve C and a rear bearing arranged inside and outside, the isolation sleeve is connected to a pump body bracket through bolts, and the pump body bracket is connected to the pump body through bolts.

[0014] Furthermore, the magnetic adjustment ring and the isolation sleeve may be fixedly connected by a plastic sleeve to enhance the strength of the isolation sleeve.

[0015] Furthermore, the magnetic adjustment ring and the isolation sleeve are fixedly connected by injection molding to enhance the strength of the isolation sleeve.

[0016] Furthermore, the number of magnetic pole pairs of the inner magnetic steel permanent magnet is P1, and the number of poles of the magnetic tuning ring is P ad , the number of pole pairs of the winding is P2, satisfying the following relationship: P ad =P1+P2.

[0017] Furthermore, the number of magnetic pole pairs P1 of the inner magnetic steel permanent magnet is smaller than the number of pole pairs P2 of the winding, and the magnetic pump is a high-speed type.

[0018] Furthermore, the number of magnetic pole pairs P1 of the inner magnetic steel permanent magnet is greater than the number of pole pairs P2 of the winding, and the magnetic pump is a high torque type.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The compact magnetic pump based on the magnetic gear compound motor provided by the present invention can effectively reduce the space occupied by the magnetic pump due to the direct drive structure of the magnetic gear compound motor, compared with the current magnetic pump which adopts the connection between the motor and the magnetic coupling, and is suitable for the transportation of liquids in confined spaces.

[0021] 2. Compared with the existing magnetic pumps, the compact magnetic pump based on the magnetic gear composite motor provided by the present invention utilizes the magnetic conductive part of the magnetic regulating device to modulate the pole pair number of the winding magnetic flux harmonic into the pole pair number of the inner rotor permanent magnet magnetic flux harmonic, so that the winding is coupled with the inner rotor permanent magnet and the same magnetic pole, thereby exponentially amplifying the output torque or speed and improving the output torque and power of the whole machine.

[0022] 3. Compared with the existing magnetic pump, the compact magnetic pump based on the magnetic gear composite motor provided by the present invention has only one rotor with inner magnetic steel, so the isolation sleeve can be fixedly connected with the magnetic adjustment ring, further enhancing the strength of the isolation sleeve and ensuring the stable operation of the magnetic pump under high power.

[0023] Based on the above reasons, the present invention can be widely promoted in the fields of magnetic pumps and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic diagram of the overall structure of the compact magnetic pump of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the magnetic gear composite motor of the magnetic pump main body of the present invention.

[0027] Figure 3 This is a schematic diagram of the partial structure of a high-speed type magnetic gear compound motor magnetic pump in Example 2 of the present invention.

[0028] Figure 4This is a schematic diagram of the partial structure of a high-torque type magnetic gear compound motor magnetic pump in Example 3 of the present invention.

[0029] In the figure: 1. pump body; 2. pump body bracket; 3. thrust ring; 4. front bearing; 5. sleeve B; 6. inner magnetic steel; 7. outer stator; 8. retaining ring; 9. end cover; 10. rear bearing; 11. sleeve C; 12. magnetic adjustment ring; 13. isolation sleeve; 14. shaft; 15. sleeve A; 16. impeller; 17. winding. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0036] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0037] Example 1

[0038] The purpose of the present invention is to develop a new type of compact magnetic pump by introducing a magnetic gear composite motor direct drive structure, so as to improve the problems of the existing magnetic pump that the existing magnetic pump occupies a large space and the isolation sleeve has low strength under high power output.

[0039] like Figure 1 and Figure 2As shown, the present invention provides a compact magnetic pump based on a magnetic gear composite motor, including: a pump body 1, an impeller 16, a front bearing 4, a thrust ring 3, a pump body bracket 2, a sleeve B5, an inner magnetic steel 6, an outer stator 7, a winding 17, a retaining ring 8, an end cover 9, a rear bearing 10, a sleeve C11, a magnetic adjustment ring 12, a spacing sleeve 13, a shaft 14, a sleeve A15, etc. An spacing sleeve 13 is provided between the inner magnetic steel 6 and the magnetic adjustment ring 12; the pump body 1 is connected to one side of the pump body bracket 2 by bolts to form a main frame of the magnetic pump; the end cover 9 is fixed to the other side of the pump body bracket 2 by bolts, and the interior of the pump body 1 and the pump body bracket 2 constitutes a first accommodating chamber, and the interior of the pump body bracket 2 and the end cover 9 constitutes a second accommodating chamber; one side of the shaft 14 is located in the first accommodating chamber, and the other side is located in the second accommodating chamber; the inner magnetic steel 6, the outer stator 7, the winding 17, the magnetic adjustment ring 12, and the spacing sleeve 13 are all placed in the second accommodating chamber. Inside; one end of the shaft 14 is connected to the impeller 16 (the impeller 16 is located in the first accommodating chamber), the middle position of the shaft 14 is clamped on the pump body bracket 2 through the shaft shoulder and the thrust ring 3 (the thrust ring 3 and the shaft shoulder are distributed on the left and right sides), so as to realize the axial fixation of the pump body bracket 2, and the other end of the shaft 14 is connected to the isolation sleeve 13 through the rear bearing 10, so as to realize the rotation of the shaft 14 and the support at both ends; the isolation sleeve 13 and the pump body bracket 2 are connected by bolts, and a sealing ring is provided to form a sealing chamber (the isolation sleeve 13 is connected to the pump body bracket 2 through the sealing ring to form a sealing chamber). The magnetic adjustment ring 12 is fixed to the end cover 9 by bolts; the outer stator 7 is fixed to the pump body bracket 2 by the card slot, and is fixed by the retaining ring 8 provided on the right side; the winding 17 is wound in the slot of the outer stator 7; the inner magnetic steel 6, the isolation sleeve 13, the magnetic adjustment ring 12, and the outer stator 7 are arranged in sequence from the inside to the outside. The impeller 16 is connected and fixed to the shaft 14 by a flat key. The shaft 14 is connected to the pump body bracket 2, and the axial fixation of the pump body bracket 2 is achieved through the shaft shoulder and the thrust ring 3; the shaft 14 is connected to the inner magnetic steel 6 through a key (the inner magnetic steel 6 is located in the sealing chamber), and the axial fixation of the inner magnetic steel 6 is achieved through the shaft sleeve B5 and the shaft sleeve C11 (the shaft sleeve B5 and the shaft sleeve C11 are respectively located on the left and right sides of the inner magnetic steel 6, and the shaft sleeve B5 is located between the shaft shoulder and the inner magnetic steel 6). The shaft sleeve A15 and the front bearing 4 are installed between the shaft 14 and the pump body bracket 2, and the shaft sleeve A15 and the front bearing 4 are arranged inside and outside; the rear bearing 10 and the shaft sleeve C11 are arranged between the right end of the shaft 14 and the isolation sleeve 13 (the shaft sleeve C11 and the rear bearing 10 are arranged inside and outside), so as to realize the rotation of the shaft 14 and the support at both ends.

[0040] The number of magnetic pole pairs of the permanent magnet of the inner magnetic steel 6 is P1; the number of poles of the magnetic adjustment ring 12 is P ad The number of pole pairs of the winding 17 is P2. The number of pole pairs of the permanent magnet of the inner magnetic steel 6 is P1, and the number of poles of the magnetic adjustment ring 12 is P ad and the number of pole pairs P2 of winding 17, satisfying the following relationship: P ad=P1+P2. When the number of magnetic pole pairs P1 of the permanent magnet of the inner magnetic steel 6 is less than the number of pole pairs P2 of the winding 17, the magnetic pump is a high speed type. When the number of magnetic pole pairs P1 of the permanent magnet of the inner magnetic steel 6 is greater than the number of pole pairs P2 of the winding 17, the magnetic pump is a high torque type.

[0041] The magnetic adjustment ring 12 and the isolation sleeve 13 can be connected by a plastic sleeve to strengthen the strength of the isolation sleeve 13. The magnetic adjustment ring 12 and the isolation sleeve 13 are connected by injection molding to strengthen the strength of the isolation sleeve 13.

[0042] The working principle of the present invention is as follows:

[0043] Three-phase alternating current is passed through the winding 17 of the outer stator 7 to generate a magnetic field of the magnetic pole logarithm of the winding 17. The magnetic field is modulated into the magnetic field of the permanent magnet pole logarithm of the inner magnetic steel 6 through the isolation sleeve 13 and the air gap magnetic ring 12 based on the magnetic field modulation theory, so as to achieve equal magnetic pole coupling between the magnetic field of the winding 17 and the magnetic field of the inner magnetic steel 6. The rotation of the magnetic field of the winding 17 drives the inner magnetic steel 6 to rotate, thereby driving the shaft 14 to rotate, and then the shaft 14 drives the impeller 16 fixed at the end to rotate, and the rotation of the impeller 16 drives the required transport liquid to be discharged from the pump body 1. The use of a rotating winding magnetic field instead of the current external motor of the magnetic pump to drive the external magnetic steel of the magnetic coupling to rotate can greatly reduce the space of the magnetic pump and improve the compactness of the magnetic pump.

[0044] Example 2

[0045] like Figure 3 , which is an embodiment of a high-speed type magnetic gear composite motor magnetic pump provided by the present invention. The pole pair number P2 of the motor stator winding 17 is 11, the pole pair number P1 of the permanent magnet of the inner magnetic steel 6 is 4, P1<P2, the transmission ratio is i=P1 / P2, the winding 17 is a low-speed magnetic field, which is coupled with the high-speed magnetic field of the permanent magnet of the inner magnetic steel 6 through the speed adjustment ring 12 to achieve the speed amplification of the transmission ratio, but the torque of this type is slightly smaller, which is suitable for high-speed working conditions.

[0046] Example 3

[0047] like Figure 4 , which is an embodiment of a high-torque type magnetic gear composite motor magnetic pump provided by the present invention. The pole pair number P2 of the motor stator winding 17 is 4, the pole pair number P1 of the internal magnetic steel 6 permanent magnet is 11, P1>P2, the transmission ratio is i=P1 / P2, the winding is a high-speed magnetic field, and the speed is reduced by the magnetic adjustment ring 12 and coupled with the low-speed magnetic field of the internal magnetic steel 6 permanent magnet to achieve torque amplification by multiples of the transmission ratio, but this type of speed is slightly lower, which is suitable for high-torque conditions.

[0048] The present invention uses a magnetic gear composite motor as the drive of the magnetic pump impeller, passes sinusoidal alternating current into the motor winding, and drives the internal magnetic steel rotor to rotate by means of the magnetic field modulation effect, thereby realizing the transportation of liquid. The magnetic field modulation of the magnetic ring can multiply the output torque or speed, and is a direct drive structure suitable for large torque or high speed. By replacing the series structure of the motor and the magnetic coupling with the direct drive structure, the space occupied by the equipment can be effectively reduced. By adjusting the relationship between the number of permanent magnet pole pairs and the number of winding pole pairs, a high-speed and high-torque dual-type magnetic pump structure is obtained. At the same time, due to the magnetic field modulation effect and the only rotor, the isolation sleeve can be directly fixed or integrated with the magnetic ring, which greatly enhances the strength of the isolation sleeve and ensures that the magnetic pump can operate smoothly under high power.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A compact magnetic pump based on a magnetic gear compound motor, characterized in that: include: A pump body (1), a pump body support (2), an inner magnetic steel (6), an outer stator (7), a winding (17), an end cover (9), a magnetic adjustment ring (12), an isolation sleeve (13), a shaft (14) and an impeller (16), wherein the pump body (1) is fixedly connected to one side of the pump body support (2) to form a magnetic pump body; the other side of the pump body support (2) is fixedly connected to the end cover (9); the interior of the pump body (1) and the pump body support (2) constitutes a first accommodating chamber, and the interior of the pump body support (2) and the end cover (9) constitutes a second accommodating chamber; The middle position of the shaft (14) is rotatably connected to the pump body bracket (2), and one side of the shaft (14) is located in the first accommodating chamber, and the other side is located in the second accommodating chamber; the inner magnetic steel (6), the outer stator (7), the winding (17), the magnetic adjustment ring (12), and the isolation sleeve (13) are all placed in the second accommodating chamber; The impeller (16) is connected to one end of the shaft (14) and is located in the first accommodating chamber, the other end of the shaft (14) is rotatably connected to one side of the isolation sleeve (13), the other side of the isolation sleeve (13) is connected to the pump body support (2) via a sealing ring to form a sealed chamber, and the internal magnetic steel (6) is connected to the shaft (14) and is located in the sealed chamber; The magnetic adjustment ring (12) is fixed on the end cover (9), the outer stator (7) is fixed on the pump body bracket (2) through a slot, and the winding (17) is wound in the slot of the outer stator (7); the inner magnetic steel (6), the isolation sleeve (13), the magnetic adjustment ring (12), and the outer stator (7) are arranged in sequence from the inside to the outside.

2. The compact magnetic pump based on the magnetic gear compound motor according to claim 1 is characterized in that: The impeller (16) is connected and fixed to the shaft (14) via a flat key.

3. The compact magnetic pump based on the magnetic gear compound motor according to claim 1 is characterized in that: The shaft (14) is connected to the inner magnetic steel (6) via a key, and the inner magnetic steel (6) is axially fixed via a shaft sleeve B (5) and a shaft sleeve C (11) arranged on both sides of the inner magnetic steel (6).

4. The compact magnetic pump based on the magnetic gear compound motor according to claim 1 is characterized in that: The middle position of the shaft (14) is connected to the pump body support (2) through the shaft sleeve A (15) and the front bearing (4) arranged inside and outside, and the axial fixation of the pump body support (2) is achieved through the shaft shoulders and thrust rings (3) arranged on both sides.

5. The compact magnetic pump based on the magnetic gear compound motor according to claim 1 is characterized in that: The other end of the shaft (14) is connected to an isolation sleeve (13) via an inner and outer sleeve C (11) and a rear bearing (10); the isolation sleeve (13) is connected to a pump body bracket (2) via bolts; and the pump body bracket (2) is connected to a pump body (1) via bolts.

6. The compact magnetic pump based on the magnetic gear compound motor according to claim 1, characterized in that: The magnetic adjustment ring (12) and the isolation sleeve (13) can be fixedly connected by a plastic sleeve to enhance the strength of the isolation sleeve (13).

7. The compact magnetic pump based on the magnetic gear compound motor according to claim 1 is characterized in that: The magnetic adjustment ring (12) and the isolation sleeve (13) are fixedly connected by injection molding, thereby enhancing the strength of the isolation sleeve (13).

8. The compact magnetic pump based on the magnetic gear compound motor according to claim 3, characterized in that: The number of magnetic pole pairs of the permanent magnet of the inner magnetic steel (6) is P1, and the number of poles of the magnetic adjustment ring (12) is P ad , the number of pole pairs of the winding (17) is P2, satisfying the following relationship: P ad =P1+P2.

9. The compact magnetic pump based on the magnetic gear compound motor according to claim 8, characterized in that: The number of magnetic pole pairs P1 of the permanent magnet of the inner magnetic steel (6) is smaller than the number of pole pairs P2 of the winding (17), and the magnetic pump is of a high-speed type.

10. The compact magnetic pump based on the magnetic gear compound motor according to claim 8, characterized in that: The number of magnetic pole pairs P1 of the permanent magnet of the inner magnetic steel (6) is greater than the number of pole pairs P2 of the winding (17), and the magnetic pump is of a high torque type.

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