A passive air-cooled magnetic levitation pump

Abstract

The present invention relates to a passive air-cooled magnetic suspension pump, comprising a magnetic suspension motor and a pump head, wherein the magnetic suspension motor and the pump head are fixedly connected, and further comprising an air-cooled heat dissipation device, wherein the air-cooled heat dissipation device comprises a first permanent magnet, a rotor and a mounting frame, wherein the first permanent magnet rotates relative to the mounting frame, the rotor is fixedly connected to the first permanent magnet, the rotor comprises blades, and the N pole and the S pole of the first permanent magnet are arranged alternately in a circle; the second permanent magnet inside the pump head is coaxial with the first permanent magnet, and the N pole and the S pole of the second permanent magnet are arranged alternately in a circle, and the N pole of the second permanent magnet corresponds to the S pole of the first permanent magnet, and the S pole corresponds to the N pole of the first permanent magnet. The first permanent magnet of the present invention is driven by the second permanent magnet, so that the blades rotate to generate airflow, and the gas flow rate on the surface of the casing is accelerated, and the rotation of the blades does not require additional motors or other power systems to drive, and does not require power supply, thereby reducing the number of heat dissipation system components, thereby reducing the overall volume and cost of the magnetic suspension pump.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension pump cooling, in particular to a passive air-cooled magnetic suspension pump. Background Art

[0002] The magnetic levitation bearingless pump (magnetic levitation pump) is a combination of a centrifugal pump (pump head), a permanent magnet synchronous motor (magnetic levitation motor), and magnetic levitation control. The main operating mechanism is to generate a levitation and rotating magnetic field through the levitation and rotating coils of the motor stator, and then to perform non-contact control of the permanent magnet rotor in the centrifugal pump (pump head) through the magnetic field. Specifically, the levitation magnetic field actively controls the radial levitation of the rotor's X and Y2 degrees of freedom, and the rotating magnetic field controls the rotor's Z-axis rotation. Finally, the passive suspension control of the remaining 3 degrees of freedom is achieved with the help of permanent magnetic force and magnetic resistance principle.

[0003] Since the magnetic levitation motor has no main shaft, it is impossible to install a cooling fan on the main shaft to cool the motor like an ordinary motor. Therefore, existing magnetic levitation motors usually use passive cooling or active cooling systems with independent power, power supply and control units.

[0004] However, passive cooling is not enough, and the installation of an additional cooling system independent of the magnetic levitation bearingless pump requires a new power supply system, power system and control system. Sensors are also required to sense the heat of the magnetic levitation motor to adjust the speed of the cooling fan. The additional components of the independent cooling system increase the overall cost and size of the magnetic levitation bearingless pump, and the increase in components also causes a decrease in reliability (for example, if the independent cooling system fails and the speed decreases or stops, the magnetic levitation motor will be damaged due to overheating). Summary of the invention

[0005] The present invention aims to solve the above problems and provides a passive air cooling system for a magnetic levitation motor to solve the above technical problems.

[0006] A passive air-cooled magnetic levitation pump comprises a magnetic levitation motor and a pump head, wherein the magnetic levitation motor and the pump head are fixedly connected, and further comprises an air-cooled heat dissipation device, wherein the air-cooled heat dissipation device comprises a first permanent magnet, a rotor and a mounting frame, wherein the first permanent magnet rotates relative to the mounting frame, the rotor is fixedly connected to the first permanent magnet, the rotor comprises blades, and the N pole and S pole of the first permanent magnet are arranged alternately in a circle; the second permanent magnet inside the pump head is coaxial with the first permanent magnet, the N pole and S pole of the second permanent magnet are arranged alternately in a circle, the N pole of the second permanent magnet corresponds to the S pole of the first permanent magnet, and the S pole of the second permanent magnet corresponds to the N pole of the first permanent magnet.

[0007] Furthermore, the mounting bracket includes a fixed shaft, and the first permanent magnet rotates around the fixed shaft.

[0008] Furthermore, a first groove is formed at one end of the casing of the magnetic levitation motor away from the pump head, the air-cooled heat dissipation device is located inside the first groove, and the mounting frame also includes a base, which is integrally formed with the end of the fixed shaft and fixedly connected to the first groove.

[0009] Furthermore, the rotor further comprises a cylinder, the first permanent magnet is inserted into the cylinder and fixedly connected to the cylinder, and the cylinder is fixedly connected to the plurality of blades.

[0010] Furthermore, it also includes a bearing, which is located inside the cylinder and sleeved on the outside of the fixed shaft, and the inner ring and outer ring of the bearing are fixedly connected to the fixed shaft and the cylinder respectively.

[0011] Furthermore, it also includes a limit block, which is fixedly connected to the fixed shaft, the fixed shaft forms a limit surface, and the limit block and the limit surface are in contact with two ends of the bearing respectively.

[0012] Furthermore, it also includes an air duct block, which includes an air duct tube and an air duct plate, the air duct tube and the air duct plate are fixedly connected, the air duct tube is inserted into the first groove, there is a first gap between the end of the air duct tube and the bottom of the first groove, there is a second gap between the side of the air duct tube and the side wall of the first groove, the air duct plate is fixedly connected to the casing, and a third gap is formed between the air duct plate and the end of the casing away from the pump head, the two ends of the second gap are respectively connected to the first gap and the third gap, a plurality of first heat sinks are formed on the side of the casing, and the third gap is connected to the gap between the first heat sinks.

[0013] Further, one end of the housing away from the pump head is a bottom and is formed with a base, the air duct plate is fixedly connected to the base, the base is formed with a first through hole, the first through hole is connected to the gap between the first heat sink, and the first through hole is connected to the third gap;

[0014] A plurality of supporting legs are formed below the base, a fourth gap exists between the supporting legs, and the fourth gap is connected to the inside of the air duct.

[0015] Furthermore, an air duct groove is formed at one end of the casing away from the pump head, and the air duct groove and the air duct plate constitute a third gap. The air duct block also includes a wind shield, which is integrally formed with the air duct plate and contacts the outer end of the first heat sink.

[0016] Furthermore, a second heat sink is formed on the inner side of the side wall of the first groove.

[0017] The present invention has the following advantages:

[0018] 1. The first permanent magnet is driven by the second permanent magnet, so that the blades rotate to generate airflow, which speeds up the gas flow rate on the surface of the casing. The rotation of the blades does not require additional power systems such as motors or power supply, which reduces the number of cooling system components, thereby reducing the overall volume and cost of the magnetic levitation pump;

[0019] 2. The first permanent magnet and the second permanent magnet move synchronously, so that the blades are adjusted synchronously according to the rotation speed of the second permanent magnet, thereby changing the heat dissipation speed according to the rotation speed of the second permanent magnet, and no additional sensors and control systems are needed to control the rotation speed of the blades;

[0020] 3. The air duct block and the casing form an air duct, so that the air moves in a directional manner along the air duct under the drive of the blades, so that the air in more areas of the casing is affected and flows faster;

[0021] 4. The first groove at the end of the casing of the magnetic levitation motor away from the pump head is close to the coil winding and has a small space, so the temperature is relatively high. Adding a fan here is conducive to quickly dissipating the heat, and the second heat sink further increases the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0023] Figure 1 : Schematic diagram of the top view of the vertical magnetic levitation pump (the pump head is not shown);

[0024] Figure 2 : Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0025] Figure 3 : Figure 2 A schematic diagram of the local enlarged structure at B in the middle;

[0026] Figure 4 : Schematic diagram of the three-dimensional structure of a vertical magnetic levitation pump (the pump head is not shown);

[0027] Figure 5 : Schematic diagram of the three-dimensional structure of the vertical magnetic levitation pump (the pump head is not shown);

[0028] Figure 6 : Schematic diagram of the three-dimensional structure of the vertical magnetic suspension pump without the air duct block (the pump head is not shown);

[0029] Figure 7: Schematic diagram of the main structure of the horizontal magnetic levitation pump (the pump head is not shown);

[0030] Figure 8 : Figure 7 Schematic diagram of the cross-sectional structure at CC in the middle;

[0031] Fig. 9 : Schematic diagram of the three-dimensional structure of a horizontal magnetic levitation pump (the pump head is not shown);

[0032] Fig.10 : Schematic diagram of the three-dimensional structure of the horizontal magnetic levitation pump without the air duct block (the pump head is not shown);

[0033] Fig.11 : Fig.10 Schematic diagram of the three-dimensional structure of the air duct block. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and examples:

[0035] 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. 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] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations 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 should not be understood as a limitation on the present invention.

[0038] like Figures 1 to 11As shown, a passive air-cooled magnetic levitation pump includes a magnetic levitation motor and a pump head 9, wherein the magnetic levitation motor and the pump head 9 are fixedly connected, and also includes an air-cooled heat dissipation device, wherein the air-cooled heat dissipation device includes a first permanent magnet 1, a rotor 2 and a mounting frame 3, wherein the first permanent magnet 1 rotates relative to the mounting frame 3, and the rotor 2 is fixedly connected to the first permanent magnet 1, and the rotor 2 includes blades 22, wherein the rotating blades 22 generate airflow, accelerate the gas flow on the surface of the pump head 9 and / or the housing 6 of the magnetic levitation motor, so that the heat of the magnetic levitation pump is quickly discharged along with the airflow, thereby avoiding the magnetic levitation pump Overheating, the N pole and S pole of the first permanent magnet 1 are arranged alternately in a circle; the second permanent magnet 91 inside the pump head 9 is coaxial with the first permanent magnet 1, and the N pole and S pole of the second permanent magnet 91 are arranged alternately in a circle, the N pole of the second permanent magnet 91 corresponds to the S pole of the first permanent magnet 1, and the S pole of the second permanent magnet 91 corresponds to the N pole of the first permanent magnet 1. The first permanent magnet 1 and the second permanent magnet 91 are basically relatively still (there may be a slight relative movement, but the corresponding magnetic poles will not change due to rotation) through the magnetic force of opposite poles attracting each other.

[0039] It should be noted that the first permanent magnet 1 can be a radially magnetized annular permanent magnet, or a plurality of permanent magnets arranged circumferentially. Preferably, the circumferential alternating arrangement is a uniform circumferential alternating arrangement. The number of pole pairs of the first permanent magnet 1 is consistent with the number of pole pairs of the second permanent magnet 91.

[0040] There are two driving modes for the rotation of the first permanent magnet 1. The first is that the stator of the magnetic levitation motor (not shown in the figure) is located radially outside the first permanent magnet 1, and the stator of the magnetic levitation motor drives the first permanent magnet 1 to rotate under the magnetic force. At this time, the material of the air duct groove 64 needs to be non-ferromagnetic. The second is that the second permanent magnet 91 inside the pump head 9 is located at the end of the first permanent magnet 1, and the opposite magnetic poles of the first permanent magnet 1 and the second permanent magnet 91 correspond to each other. The first permanent magnet 1 rotates synchronously with the second permanent magnet 91 through the attraction of opposite poles. Figure 2 The following embodiments all adopt the second driving mode.

[0041] Furthermore, the mounting bracket 3 includes a fixed shaft 32 , and the first permanent magnet 1 rotates around the fixed shaft 32 , that is, the rotation axis of the first permanent magnet 1 and the axis of the fixed shaft 32 coincide with each other.

[0042] Furthermore, a first groove 63 is formed at one end of the casing 6 of the magnetic levitation motor away from the pump head 9, and the air-cooled heat dissipation device is located inside the first groove 63. The mounting frame 3 also includes a base 31, and the base 31 is integrally formed with the end of the fixed shaft 32, and the base 31 is fixedly connected to the first groove 63.

[0043] Preferably, the base 31 and the housing 6 may be fixedly connected by conventional fixing methods such as threaded connection, brazing, clamping, or bonding.

[0044] Furthermore, the rotor 2 also includes a cylinder 21, the first permanent magnet 1 is inserted into the cylinder 21 and fixedly connected to the cylinder 21, the cylinder 21 is fixedly connected to multiple blades 22, and the cylinder 21 provides a space for installing and fixing the first permanent magnet 1, and the cylinder 21 is fixedly connected to multiple blades 22.

[0045] Furthermore, it also includes a bearing 4, which is located inside the cylinder 21 and is mounted on the outside of the fixed shaft 32. The inner ring and outer ring of the bearing 4 are fixedly connected to the fixed shaft 32 and the cylinder 21 respectively. The bearing 4 is used to reduce friction resistance and also limits the first permanent magnet 1 and the cylinder 21 so that the first permanent magnet 1 and the cylinder 21 have only one degree of rotational freedom.

[0046] Furthermore, it also includes a limit block 5, the limit block 5 is fixedly connected to the fixed shaft 32, the fixed shaft 32 forms a limit surface 321, the limit block 5 and the limit surface 321 are in contact with both ends of the bearing 4 respectively, and the limit surface 321 plays a role in positioning and limiting the inner ring of the bearing 4. Preferably, the limit block 5 is threadedly connected to the fixed shaft 32.

[0047] Furthermore, it also includes an air duct block 7, the air duct block 7 includes an air duct cylinder 71 and an air duct plate 72, the air duct cylinder 71 and the air duct plate 72 are fixedly connected, the air duct cylinder 71 is inserted into the first groove 63, there is a first gap between the end of the air duct cylinder 71 and the bottom of the first groove 63, there is a second gap between the side of the air duct cylinder 71 and the side wall of the first groove 63, the air duct plate 72 is fixedly connected to the housing 6, the air duct plate 72 and the end of the housing 6 away from the pump head 9 form a third gap, the two ends of the second gap are respectively connected to the first gap and the third gap, a plurality of first heat sinks 61 are formed on the side of the housing 6, and the third gap is connected to the gap between the first heat sinks 61. The air duct block 7 allows the airflow flowing through the surface of the housing 6 to form an air duct, so that the air moves in a directional manner and the heat dissipation efficiency is accelerated.

[0048] The direction of the airflow is from the gap between the first heat sink fins 61 through the third gap, the second gap and the first gap in sequence, and is sucked in from the side by the rotor 2 and then discharged from the axial direction. The airflow passes through the air duct cylinder 71 and is discharged outward.

[0049] Further, the end of the housing 6 away from the pump head 9 is the bottom and is formed with a base 62, the air duct plate 72 is fixedly connected to the base 62, the base 62 is formed with a first through hole 621, the first through hole 621 is connected to the gap between the first heat sink 61, and the first through hole 621 is connected to the third gap;

[0050] A plurality of legs 622 are formed below the base 62 , and a fourth gap exists between the legs 622 . The fourth gap is connected to the inside of the air duct tube 71 .

[0051] The above vertical magnetic levitation pump has the following airflow direction: Figure 2 As shown by the hollow arrow in the figure. Under the suction of the rotating blades 22, the air enters the gap between the first heat sink 61 from the side or the top, then passes downward through the first through hole 621, and then passes through the third gap between the air duct plate 72 and the base 62 and moves upward, and the air passes through the second gap from bottom to top. After passing through the first gap, the air moves downward through the inside of the air duct cylinder 71, and finally is discharged horizontally outward from the gap between the legs 622.

[0052] Furthermore, an air duct groove 64 is formed at one end of the casing 6 away from the pump head 9, and the air duct groove 64 and the air duct plate 72 constitute a third gap. The air duct block 7 also includes a wind shield 73, which is integrally formed with the air duct plate 72, and the wind shield 73 contacts the outer end of the first heat sink 61.

[0053] The above-mentioned horizontal magnetic levitation pump has the following airflow direction: Figure 8 As shown by the hollow arrow in FIG. 2 . Under the suction of the rotating blades 22, the air enters the gap between the first heat sink 61 from the side or end, and then enters the air duct groove 64 from the inner side of the wind shield 73, and the air enters the first groove 63 along the air duct groove 64. After passing through the blades 22, the air leaves the air duct cylinder 71 outward along the air duct cylinder 71.

[0054] Furthermore, a second heat sink 631 is formed on the inner side of the side wall of the first groove 63 .

[0055] It should be noted that some internal components of the pump head 9 and the internal components of the magnetic levitation motor are not shown in the figure and are all prior art. Among them, the end of the housing 6 is fixedly connected to the end cover 8 of the magnetic levitation motor, and the pump head 9 is inserted into the end cover 8 and fixed.

[0056] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications made based on the present invention belong to the scope of protection claimed by the present invention.

Claims

1. A passive air-cooled magnetic levitation pump, the magnetic levitation pump being a magnetic levitation bearingless pump, the magnetic levitation pump comprising a magnetic levitation motor and a pump head (9), the magnetic levitation motor and the pump head (9) being fixedly connected, characterized in that: It also comprises an air-cooling heat dissipation device, the air-cooling heat dissipation device comprising a first permanent magnet (1), a rotor (2) and a mounting frame (3), the first permanent magnet (1) rotates relative to the mounting frame (3), the rotor (2) is fixedly connected to the first permanent magnet (1), the rotor (2) comprises blades (22), and the N pole and the S pole of the first permanent magnet (1) are arranged alternately in a circle; the second permanent magnet (91) inside the pump head (9) is coaxial with the first permanent magnet (1), the N pole and the S pole of the second permanent magnet (91) are arranged alternately in a circle, the N pole of the second permanent magnet (91) corresponds to the S pole of the first permanent magnet (1), and the S pole of the second permanent magnet (91) corresponds to the N pole of the first permanent magnet (1); The first permanent magnet (1) is driven by the second permanent magnet (91); A first groove (63) is formed at one end of the casing (6) of the magnetic suspension motor away from the pump head (9), and the mounting frame (3) is fixedly connected to the first groove (63).

2. A passive air-cooled magnetic levitation pump according to claim 1, characterized in that: The mounting frame (3) comprises a fixed shaft (32), and the first permanent magnet (1) rotates around the fixed shaft (32).

3. A passive air-cooled magnetic levitation pump according to claim 2, characterized in that: The air-cooling heat dissipation device is located inside the first groove (63), and the mounting frame (3) further comprises a base (31), the base (31) and the end of the fixed shaft (32) are integrally formed, and the base (31) is fixedly connected to the first groove (63).

4. A passive air-cooled magnetic levitation pump according to claim 1, characterized in that: The rotor (2) further comprises a cylinder (21), the first permanent magnet (1) being inserted into the cylinder (21) and fixedly connected to the cylinder (21), and the cylinder (21) being fixedly connected to a plurality of blades (22).

5. A passive air-cooled magnetic levitation pump according to claim 4, characterized in that: It also includes a bearing (4), the bearing (4) being located inside the cylinder (21) and sleeved on the outside of the fixed shaft (32), the inner ring and outer ring of the bearing (4) being fixedly connected to the fixed shaft (32) and the cylinder (21) respectively.

6. A passive air-cooled magnetic levitation pump according to claim 5, characterized in that: It also comprises a limit block (5), the limit block (5) being fixedly connected to the fixed shaft (32), the fixed shaft (32) forming a limit surface (321), and the limit block (5) and the limit surface (321) respectively contacting two ends of the bearing (4).

7. A passive air-cooled magnetic levitation pump according to claim 3, characterized in that: The air duct block (7) further comprises an air duct block (7), the air duct block (7) comprising an air duct cylinder (71) and an air duct plate (72), the air duct cylinder (71) and the air duct plate (72) being fixedly connected, the air duct cylinder (71) being inserted into the first groove (63), a first gap being formed between an end of the air duct cylinder (71) and a groove bottom of the first groove (63), a second gap being formed between a side surface of the air duct cylinder (71) and a side wall of the first groove (63), the air duct plate (72) being fixedly connected to the casing (6), a third gap being formed between the air duct plate (72) and an end of the casing (6) away from the pump head (9), the two ends of the second gap being respectively connected to the first gap and the third gap, a plurality of first heat sinks (61) being formed on the side surface of the casing (6), the third gap being connected to the gaps between the first heat sinks (61).

8. A passive air-cooled magnetic levitation pump according to claim 7, characterized in that: An end of the housing (6) away from the pump head (9) is a bottom and is formed with a base (62); the air duct plate (72) is fixedly connected to the base (62); the base (62) is formed with a first through hole (621); the first through hole (621) is connected to the gap between the first heat sink (61); and the first through hole (621) is connected to the third gap; A plurality of supporting feet (622) are formed below the base (62), a fourth gap exists between the supporting feet (622), and the fourth gap is connected to the inside of the air duct cylinder (71).

9. The passive air-cooled magnetic levitation pump according to claim 7, characterized in that: An air duct groove (64) is formed at one end of the housing (6) away from the pump head (9); the air duct groove (64) and the air duct plate (72) form a third gap; the air duct block (7) further comprises a wind shield (73); the wind shield (73) and the air duct plate (72) are integrally formed; the wind shield (73) contacts the outer end of the first heat sink (61).

10. The passive air-cooled magnetic levitation pump according to claim 3, characterized in that: A second heat sink (631) is formed on the inner side of the side wall of the first groove (63).

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