Compact magnetic drive pump

Abstract

The invention provides a compact magnetic drive pump. The compact magnetic drive pump comprises a pump shell, an impeller and a magnetic coupling device. A pump chamber for liquid to flow in and out is arranged in the pump shell, a pivot is installed in the center of the pump chamber, the impeller is arranged in the pump chamber, and the impeller is rotatably supported at one end of the pivot through a pivot bearing and used for enabling the impeller to deflect. The magnetic coupling device comprises a driven permanent magnet arranged in the impeller and a driving permanent magnet for driving the driven permanent magnet through rotation of the rotor. A flow guide plate is arranged at an inlet of the pump shell, a pivot bearing is arranged at one end of the flow guide plate, one end of a pivot is connected with a supporting piece through a spherical pair, the supporting piece is connected with the pivot bearing through a spherical pair and used for enabling the supporting piece to incline between one end of the pivot and the pivot bearing, and the supporting piece is connected with an impeller. Non-contact transmission of power can be effectively achieved, the impeller can deflect by a certain angle in the rotating process, and therefore conveying of liquid media containing fine particles is facilitated.

Description

Technical Field

[0001] The invention relates to the field of magnetic pumps, in particular to a compact magnetic pump. Background Art

[0002] Centrifugal pumps are generally equipped with shaft seals to prevent the liquid in the pump cavity from leaking outward from the shaft, and to prevent air or the like from being sucked in from the outside. Common shaft seals include packing seals, mechanical seals, labyrinth seals, etc. The appropriate method is selected according to the properties of the liquid, the speed of the equipment, the working pressure, temperature, etc.

[0003] The centrifugal pump uses the rotation of the impeller in the pump casing to give the liquid centrifugal force, increase its speed and pressure, suck the liquid from the low-pressure area and accelerate it to the high-pressure area, thereby achieving liquid transportation. The magnetic pump uses an electric motor as a power source to drive the external magnet to rotate at high speed. This rotational action penetrates the isolation sleeve through strong magnetic lines of force and is transmitted to the internal magnetic rotor without contact, achieving non-mechanical energy transmission. The internal magnetic rotor is closely connected to the impeller, so when the internal magnetic rotor rotates, the impeller also rotates synchronously, generating a strong centrifugal force, sucking the medium from the pump inlet and accelerating it along a specific flow channel to the outlet, completing the efficient transportation of the liquid.

[0004] However, the existing magnetic pumps cannot transport fluids containing particles, and when power outages and power shortages occur, power cannot be supplemented, resulting in insufficient transport lift. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a compact magnetic pump that can effectively realize contactless transmission of power and avoid the common mechanical seal leakage problem in traditional pump equipment. In addition, since the impeller is rotatably supported at one end of the pivot through a pivot bearing, the impeller can generate a certain angle of deflection during the rotation process, which is conducive to the transportation of liquid media containing fine particles.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] A compact magnetic pump comprises a pump casing, an impeller and a magnetic coupling device;

[0008] The pump housing has a pump chamber in which liquid enters and exits, and a pivot is installed at the center of the pump chamber.

[0009] The impeller is arranged in the pump chamber, and the impeller is rotatably supported at one end of the pivot through a pivot bearing, so that the impeller can be deflected; the magnetic coupling device includes a driven permanent magnet built into the impeller and a driving permanent magnet that drives the driven permanent magnet through the rotation of the rotor.

[0010] Furthermore, a guide plate is provided at the inlet of the pump casing, one end of the guide plate is provided with a pivot bearing, one end of the pivot is connected to a support member ball pair, the support member is connected to the pivot bearing ball pair, and is used to tilt the support member between one end of the pivot and the pivot bearing, and the support member is connected to the impeller.

[0011] Furthermore, the upper part of the pump chamber is a double volute chamber, the lower part of the pump chamber is an impeller installation chamber, and a pivot is installed at the center of the impeller installation chamber, so that the cross-section of the impeller installation chamber is "concave".

[0012] Furthermore, there is a gap between the impeller and the impeller installation chamber, and a plurality of through holes are provided on the support member for forming symmetrical secondary flows on the surfaces on both sides of the impeller in the direction of the impeller rotation axis.

[0013] Furthermore, the driven permanent magnet is tiltedly arranged inside the impeller, and the driving permanent magnet is tiltedly arranged inside the rotor in the same direction as the driven permanent magnet, so as to generate thrust acting on the pivot bearing to stabilize the rotation of the impeller.

[0014] Furthermore, it also includes an anti-contact device, which is arranged in an area where the impeller and the pump casing may contact each other in a stopped state on the opposing surfaces of the impeller and the pump casing, and prevents the impeller from contacting the pump casing by generating a repulsive force.

[0015] Furthermore, the anti-contact device includes a first anti-contact magnet and a second anti-contact magnet, a number of the first anti-contact magnets are evenly installed in the rotor, a number of the second anti-contact magnets are located in the impeller, and the positions of the first anti-contact magnet and the second anti-contact magnet match, and the magnetic properties of the first anti-contact magnet and the second anti-contact magnet are different.

[0016] Furthermore, a plurality of electromagnets are arranged in the pump housing, and a magnetic field is generated by the electromagnets when electricity is supplied; the electromagnets are located between the first anti-contact magnet and the second anti-contact magnet.

[0017] Further, when the rotor rotation drive is powered off, a magnetic field having a different magnetic property from that of the second contact preventing magnet is generated by the electromagnet to prevent the impeller from contacting the pump housing.

[0018] Furthermore, when the power supply for the rotor rotation drive is insufficient, the electromagnet generates a magnetic field different from the magnetic field of the second anti-contact magnet, so that the electromagnet realizes the planar transmission of the impeller to compensate for the insufficient power supply for the rotor rotation drive.

[0019] The beneficial effects of the present invention are:

[0020] 1. The compact magnetic pump described in the present invention is driven by a magnetic coupling device and does not have a shaft seal mechanism, which can effectively realize contactless transmission of power and avoid the common mechanical seal leakage problem in traditional pump equipment. In addition, since the impeller is rotatably supported at one end of the pivot through a pivot bearing, the impeller can produce a certain angle of deflection during the rotation process, which is conducive to the transportation of liquid media containing fine particles. In addition, since there is no mechanical seal, there is no possibility of damage to the shaft seal machine for high-lift conditions or chemical solutions containing fine particles.

[0021] 2. The compact magnetic pump described in the present invention has an impeller that is rotatably supported at one end of the pivot shaft through a pivot bearing. Due to external force or similar reasons, the rotating impeller may be out of balance and become tilted. However, even if the impeller is tilted, since the driven permanent magnet is tilted inside the impeller, and the driving permanent magnet is tilted in the rotor in the same direction as the driven permanent magnet, the magnetic force of the magnetic coupling device will generate a restoring force that tends to correct the tilt and restore the impeller to its normal position. This restoring force causes the driven permanent magnet located below the driving magnet to move upward due to the magnetic force tilting downward on the right side of the impeller, and simultaneously generates a counterclockwise rotation force. The driven permanent magnet located above the driving magnet is pulled down due to the magnetic force located on the left side of the upwardly tilted impeller, thereby preventing the impeller from interfering with the casing.

[0022] 3. The compact magnetic pump described in the present invention has a rotatable support member at one end of the guide plate, and the support member is in contact with the pivot bearing to limit the deflection angle of the impeller. Therefore, the impeller of the present invention rotates within an angle less than 3 degrees, allowing the impeller to tilt, which weakens the pulsation effect to a certain extent, improves the suction capacity of the pump, and reduces the radial load on the pivot bearing to a certain extent.

[0023] 4. In the compact magnetic pump described in the present invention, there is a gap between the impeller and the impeller mounting chamber, and a plurality of through holes are provided on the support member, so that a vertically symmetrical secondary flow can be formed on the upper and lower surfaces of the impeller, flowing along the air gap along the direction of the rotation axis, thereby balancing the axial thrust in the vertically opposite direction and reducing the load on the pivot bearing.

[0024] 5. The compact magnetic pump described in the present invention has an anti-contact device arranged in the area where the relative surfaces of the impeller and the pump casing may contact each other in the stopped state. The anti-contact device prevents the impeller from contacting the pump casing by generating a repulsive force. When the rotor rotation drive is powered off, the electromagnet generates a magnetic field with a magnetic property different from that of the second anti-contact magnet to prevent the impeller from contacting the pump casing. When the rotor rotation drive is powered off, the electromagnet generates a magnetic field with a magnetic property different from that of the second anti-contact magnet, so as to prevent the impeller from contacting the pump casing. When the rotor rotation drive is powered off insufficiently, the electromagnet generates a magnetic field with a magnetic property different from that of the second anti-contact magnet, so that the electromagnet realizes planar transmission of the impeller, compensates for the insufficient power supply to the rotor rotation drive, and ensures that the pump can reach the optimal operating condition.

[0025] 6. In the compact magnetic pump described in the present invention, the pivot bearing is arranged on the inlet side with a high flow rate so that it can be effectively cooled by the fluid flow introduced through the inlet, thereby suppressing the temperature increase of the pivot bearing and improving the durability of the pivot bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic structural diagram of the compact magnetic pump described in the present invention.

[0028] Figure 2 This is a schematic diagram of the restoring force of the compact magnetic pump described in the present invention when the impeller is tilted.

[0029] Figure 3 This is an exploded view of the magnetic force generated by the magnetic coupling device of the compact magnetic pump according to the present invention.

[0030] Figure 4 This is a schematic diagram of the secondary flow of the compact magnetic pump described in the present invention.

[0031] Figure 5 It is a schematic cross-sectional view of the compact magnetic pump support member AA according to the present invention.

[0032] In the figure:

[0033] 1- pump housing; 2- guide plate; 3- support member; 4- pivot; 5- impeller; 6- driven permanent magnet; 7- driving permanent magnet; 8- second anti-contact; 9- electromagnet; 10- first anti-contact magnet; 11- rotor; 12- pivot bearing; 13- pump chamber; 14- pivot support. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] like Figure 1 As shown, the compact magnetic pump described in the present invention includes a pump housing 1, an impeller 5 and a magnetic coupling device; the pump housing forms a pump chamber 13 having a liquid inlet and a liquid outlet, the pump chamber 13 introduces liquid through an inlet coaxial with the center of the rotation axis of the impeller 5, and drives the impeller 5 to rotate through the magnetic coupling device to pressurize the liquid. The magnetic coupling device includes a driven permanent magnet 6 built into the impeller 5 and a driving permanent magnet 7 that drives the driven permanent magnet 6 through the rotation of the rotor; the motor in the figure drives the rotor to rotate. The pressurized liquid in the pump chamber 13 passes through the outlet provided in the pump chamber 13, and the liquid is transported radially along the impeller 5.

[0038] like Figure 1 and Figure 2 As shown, the impeller 5 rotates in the pump chamber 13 of the housing 1, and the impeller 5 is rotatably supported at one end of the pivot 4 through the pivot bearing 12, and the impeller 5 can be deflected under the action of external force; it can be seen from the figure that the axial center line of the inlet is aligned with the pivot bearing 12. The impeller 5 rotates on a horizontal plane, and the inlet is set on a vertical line that is perpendicular to the rotating surface of the impeller 5 and is located above the rotating surface of the impeller.

[0039] The pump housing 1 is provided with a guide plate 2 at the inlet, one end of the guide plate 2 is provided with a pivot bearing 12, one end of the pivot 4 is connected to the support member 3 by a ball pair, the support member 3 is connected to the pivot bearing 12 by a ball pair, the support member 3 is connected to the impeller, the support member 3 can be tilted between one end of the pivot 4 and the pivot bearing 12, and the profile of the guide plate 2 can limit the deflection angle of the impeller 5. The pivot bearing 12 and the support member 3 can also be regarded as a universal joint.

[0040] The pivot bearing 12 has a concave hemispherical surface, supporting a support member 3 having a convex curved surface of substantially the same shape, and the other concave hemispherical surface of the support member 3 with the convex spherical surface is supported on one end of the pivot 4. A layer of Teflon coating is provided at the contact point between the pivot bearing 12, the pivot 4 and the support member 3, which can greatly reduce the friction between the pivot 12 and the pivot 4. The support member 3 is provided with a chamfer to avoid interference between the components when the impeller is tilted.

[0041] like Figure 1 As shown, the upper part of the pump chamber 13 is a double volute chamber, and the lower part of the pump chamber 13 is an impeller mounting chamber. The center of the impeller mounting chamber is provided with a pivot 12 through a pivot support 14, so that the cross section of the impeller mounting chamber is "concave". There is a gap between the impeller 5 and the impeller mounting chamber, and a plurality of through holes are provided on the support member 3. A vertically symmetrical secondary flow flowing along the air gap in the direction of the rotation axis can be formed on the upper and lower surfaces of the impeller 5, which can balance the axial thrust in the vertically opposite direction and reduce the load on the pivot bearing. In some cases, since the support members 3 have a shape that allows smooth changes in direction, these support members 3 accelerate the formation of the vertically symmetrical secondary flow.

[0042] Implementation example Figure 1 and Figure 3As shown, the configuration of the impeller 5 is such that a plurality of blades are mounted on the impeller body. The plurality of blades are mounted radially on the flow port side end face of the substantially hollow oblique circular impeller body in a radial manner. The impeller 5 configured in this way is supported in the direction of the rotation axis relative to the housing 1 by a pivot bearing, and is supported by the driving force of a magnetic coupling device so that it can rotate around the rotation axis. The magnetic coupling device includes a driven permanent magnet 6 built into the impeller 5 and a driving magnet 7 rotating around the periphery of the housing 1. In an embodiment, a plurality of driven permanent magnets 6 are embedded in the impeller 5 body at regular intervals in the circumferential direction. A plurality of driving magnets 7 are fixed to a rotor, and the rotor rotates at regular pitches in the circumferential direction together with a rotating shaft connected to a driving source. In the present invention, the driven permanent magnet 6 and the driving permanent magnet 7 of the magnetic coupling device are arranged on a straight line on the flow port side inclined from the impeller rotating surface to the center of the impeller rotating axis. That is, the driven permanent magnet 6 is tilted inside the impeller 5, and the driving permanent magnet 7 is tilted inside the rotor in the same direction as the driven permanent magnet 6. The driven permanent magnet 6 and the driving permanent magnet 7 are tilted from the rotating surface of the impeller 5 to generate thrust acting on the pivot bearing 12 to stabilize the rotation of the impeller 5. The magnetic force acting in the direction of mutual attraction between the driven permanent magnet 6 and the driving permanent magnet 7 is generated by the driving magnet 7 in the direction of tilting from the rotating surface of the impeller to the inlet side toward the center of the rotating axis. Since the magnetic coupling device is tilted, the magnetic force f between the driven permanent magnet 6 and the driving permanent magnet 7 acts in the tilted direction relative to the center of the rotating axis and the rotating surface of the impeller. The magnetic force f is decomposed into a thrust direction component (thrust component) fs that pushes the pivot 4 to the pivot bearing 12 in the direction of the rotation axis and a radial component (radial component) fs that acts outward in the direction of the impeller rotating surface according to the inclination angle f, and therefore, the thrust f acting on the pivot bearing 12 is equal to the sum of the thrust components Fs corresponding to the number of the driven permanent magnets 7 and the driving permanent magnets 6 that generate the magnetic force f. Since the thrust f is always applied to push the pivot 4 to the pivot bearing 12 when the impeller 5 rotates, the impeller 5 supported by the pivot bearing 12 can be stably rotated by receiving the thrust of the thrust f.

[0043] Implementation example Figure 1 and Figure 2 As shown, the impeller 5 may become tilted from a horizontal state due to external force or similar reasons. In this embodiment, even if the impeller 5 is tilted, due to the magnetic force of the magnetic coupling device, there is a restoring force that tends to correct the tilt and restore the impeller 5 to a normal position, thereby preventing the impeller 5 from interfering with the housing 1. In the present invention, the impeller is allowed to be tilted within 3 degrees in the horizontal direction. On the one hand, the pulsation effect can be reduced to a certain extent, and the radial force amplitude change can be reduced, reducing the noise generated by the machine. On the other hand, the impeller optimizes the fluid dynamic performance to a certain extent at some tilt angles, improves the hydraulic efficiency, and enables the magnetic pump to achieve high head at low energy consumption. Figure 2This is an illustration of the restoring force of the magnetic coupling acting on the impeller 5. As shown in the figure, the impeller 5 is tilted to the right on the plane of the figure, and the counterclockwise restoring force is represented by an open arrow R acting on the impeller 5. The restoring force R causes the driven permanent magnet 6 located below the driving permanent magnet 7 to move upward (in the direction of arrow r1) due to the magnetic force filling on the right side of the impeller 5 tilting downward, and at the same time generates a counterclockwise rotation force. The driven permanent magnet 6 located above the driving permanent magnet 7 is pulled down (in the direction of arrow r2) due to the magnetic force f2 located on the left side of the impeller 5 tilting upward. At the same time, a second anti-contact magnet 8 and a first anti-contact magnet 10 located below the adjustment magnet 8 are provided. When the impeller 5 in the example of the present invention tilts to the right, the second anti-contact magnet 8 is subjected to the magnetic force of the first anti-contact magnet 10 and moves upward (in the direction of arrow r3).

[0044] like Figure 2 and Figure 3 As shown, an anti-contact device is also included. The anti-contact device is arranged in an area where the impeller 5 and the pump housing 2 may contact each other in a stopped state on the opposing surfaces of the impeller 5 and the pump housing 2. The anti-contact device prevents the impeller 5 from contacting the pump housing 2 by generating a repulsive force. The anti-contact device includes a first anti-contact magnet 10 and a second anti-contact magnet 8. A plurality of the first anti-contact magnets 10 are evenly installed in the rotor, and a plurality of the second anti-contact magnets 8 are located in the impeller 5. The positions of the first anti-contact magnet 10 and the second anti-contact magnet 8 match each other, and the magnetic properties of the first anti-contact magnet 10 and the second anti-contact magnet 8 are different.

[0045] A plurality of electromagnets 9 are arranged in the pump housing 1. When the power is turned on, the electromagnets 9 generate a magnetic field. The electromagnets 9 are located between the first anti-contact magnet 10 and the second anti-contact magnet 8. When the rotor rotation drive is powered off, the electromagnets 9 generate a magnetic field different from the magnetic field of the second anti-contact magnet 8 to prevent the impeller 5 from contacting the pump housing 2. When the power supply for the rotor rotation drive is insufficient, the electromagnets 9 generate a magnetic field different from the magnetic field of the second anti-contact magnet 8, so that the electromagnets 9 realize the planar transmission of the impeller 5, which has the effect of increasing the torque and is used to compensate for the insufficient power supply for the rotor rotation drive.

[0046] The working principle is:

[0047] When the motor starts, by driving the magnetic coupling device, that is, by rotating the driving magnet 7 together with the rotor, the driving magnet rotates to generate a magnetic field, so that the driven permanent magnet 6 is attracted by the driving magnet 7, forming a magnetic coupling, and further causing the impeller 5 to be entrained and rotate together, so that the liquid introduced through the inlet along the direction of the rotation axis is pressurized by the impeller 5 and flows out from the outlet radially. The magnetic pump uses magnetic coupling to transmit power without the need for mechanical seals. For some working conditions such as liquids containing particles, since the impeller can produce a certain angle of deflection during rotation, this is conducive to the transportation of liquid media containing fine particles.

[0048] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0049] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A compact magnetic pump, characterized in that: It comprises a pump casing (1), an impeller (5) and a magnetic coupling device; The pump housing (1) has a pump chamber (13) for liquid to enter and exit, and a pivot (4) is installed at the center of the pump chamber (13). The impeller (5) is arranged in a pump chamber (13); the impeller (5) is rotatably supported at one end of a pivot shaft (4) via a pivot bearing (12) so as to enable the impeller (5) to generate deflection; the magnetic coupling device comprises a driven permanent magnet (6) built into the impeller (5) and a driving permanent magnet (7) which drives the driven permanent magnet (6) through the rotation of a rotor.

2. The compact magnetic pump according to claim 1, characterized in that A guide plate (2) is provided at the inlet of the pump housing (1), one end of the guide plate (2) is provided with a pivot bearing (12), one end of the pivot (4) is connected to a support member (3) by a ball joint, the support member (3) is connected to the pivot bearing (12) by a ball joint, and is used to tilt the support member (3) between one end of the pivot (4) and the pivot bearing (12), and the support member (3) is connected to an impeller.

3. The compact magnetic pump according to claim 1, characterized in that The upper part of the pump chamber (13) is a double volute chamber, and the lower part of the pump chamber (13) is an impeller installation chamber. A pivot (12) is installed at the center of the impeller installation chamber, so that the cross section of the impeller installation chamber is "concave".

4. The compact magnetic pump according to claim 1, characterized in that There is a gap between the impeller (5) and the impeller installation chamber, and a plurality of through holes are provided on the support member (3) for forming symmetrical secondary flows on the surfaces on both sides of the impeller (5) in the direction of the impeller (5) rotation axis.

5. The compact magnetic pump according to claim 1, characterized in that: The driven permanent magnet (6) is arranged obliquely inside the impeller (5), and the driving permanent magnet (7) is arranged obliquely inside the rotor in the same direction as the driven permanent magnet (6), so as to generate thrust acting on the pivot bearing (12) to stabilize the rotation of the impeller (5).

6. The compact magnetic pump according to claim 1, characterized in that: The invention also comprises an anti-contact device, which is arranged in an area where the impeller (5) and the pump casing (2) may come into contact in a stopped state on the opposing surfaces of the impeller (5) and the pump casing (2), and the anti-contact device prevents the impeller (5) from coming into contact with the pump casing (2) by generating a repulsive force.

7. The compact magnetic pump according to claim 6, characterized in that: The anti-contact device comprises a first anti-contact magnet (10) and a second anti-contact magnet (8), wherein a plurality of the first anti-contact magnets (10) are evenly installed in the rotor, and a plurality of the second anti-contact magnets (8) are located in the impeller (5), and the positions of the first anti-contact magnet (10) and the second anti-contact magnet (8) match, and the magnetic properties of the first anti-contact magnet (10) and the second anti-contact magnet (8) are different.

8. The compact magnetic pump according to claim 7, characterized in that: A plurality of electromagnets (9) are arranged in the pump housing (1), and when electricity is supplied, the electromagnets (9) generate a magnetic field; the electromagnets (9) are located between a first anti-contact magnet (10) and a second anti-contact magnet (8).

9. The compact magnetic pump according to claim 7, characterized in that: When the rotor rotation drive is powered off, the electromagnet (9) generates a magnetic field different from the magnetic field of the second anti-contact magnet (8) to prevent the impeller (5) from contacting the pump housing (2).

10. The compact magnetic pump according to claim 7, characterized in that: When the power supply for the rotor rotation drive is insufficient, the electromagnet (9) generates a magnetic field different from the magnetic field of the second anti-contact magnet (8), so that the electromagnet (9) realizes the planar transmission of the impeller (5) to compensate for the insufficient power supply for the rotor rotation drive.

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