A passive liquid-cooled magnetic levitation pump

Abstract

The present invention relates to a passive liquid-cooled magnetic levitation pump, comprising a magnetic levitation motor and a pump head, wherein the magnetic levitation motor and the pump head are fixedly connected, and further comprising a water circulation device and a water tank, wherein the water circulation device comprises a first permanent magnet, a rotor and a mounting frame, wherein the mounting frame is fixedly connected to the casing of the magnetic levitation motor, a second permanent magnet inside the pump head drives the first permanent magnet to rotate relative to the mounting frame, the rotor is fixedly connected to the first permanent magnet, the rotor comprises blades, a second cavity is formed between the water tank and the outer side of the casing of the magnetic levitation motor, and the blades are used to drive the liquid flow of the water tank. The first permanent magnet of the present invention is driven by the second permanent magnet, so that the blades rotate to generate water flow, and the heat on the surface of the casing is transferred to the box body and / or the radiator through the liquid, 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 cost of liquid cooling of the magnetic levitation pump.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension pump cooling, in particular to a passive liquid-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 dissipate heat for the motor like ordinary motors, so some existing magnetic levitation motors use water cooling, and the water cooling system requires an independent power, power supply and control unit. The additional components of the independent water cooling system increase the overall cost and volume 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, it will cause the magnetic levitation motor to be damaged due to overheating).

[0004] The casing of the existing magnetic levitation motor is formed with a first concave groove, and the concave structure causes poor heat dissipation inside the first groove. 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 liquid-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 a water circulation device and a water tank, wherein the water circulation device comprises a first permanent magnet, a rotor and a mounting frame, wherein the mounting frame is fixedly connected to the casing of the magnetic levitation motor, a second permanent magnet inside the pump head drives the first permanent magnet to rotate relative to the mounting frame, the rotor is fixedly connected to the first permanent magnet, the rotor comprises blades, a second cavity is formed between the water tank and the outer side of the casing of the magnetic levitation motor, and the blades are used to drive the liquid flow in the water tank.

[0007] Furthermore, the mounting frame also includes a fixed axis, the first permanent magnet rotates around the fixed axis, 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, and 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.

[0008] Furthermore, a first groove is formed at one end of the casing of the magnetic levitation motor away from the pump head, and the water circulation device is located inside the first groove.

[0009] Furthermore, the mounting frame also includes a base, the base is integrally formed with the end of the fixed shaft, and the base is fixedly connected to the first groove.

[0010] 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.

[0011] Furthermore, the water circulation device 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.

[0012] Furthermore, the water circulation device 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.

[0013] Further, the water tank includes a box body and a tube body, the box body and the tube body are fixedly connected, the tube body is inserted into the first groove, the second cavity includes a first gap, a second gap and a third gap, the first gap is located between the end of the tube body and the bottom of the first groove, the second gap is located between the side of the tube body and the side wall of the first groove, the third gap is located between the box body and the end of the casing away from the pump head, the two ends of the second gap are respectively connected with the first gap and the third gap, a first cavity is formed inside the water tank, one end of the inner cavity of the tube body inside the tube body is connected with the third gap, and the other end is connected with the first cavity or the water outlet of the water tank, and a connecting through hole is formed at one end of the box body close to the casing, and the connecting through hole connects the first cavity and the second cavity.

[0014] Furthermore, a protrusion is formed at the end of the housing away from the pump head, and flow channel grooves are formed between the protrusions.

[0015] Furthermore, a radiator is also included. The water tank is formed with a water inlet and a water outlet, and the radiator is respectively connected to the water inlet and the water outlet.

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

[0017] Furthermore, it also includes a third heat sink, which is integrally formed with the outer side surface of the water tank.

[0018] Furthermore, a plurality of first heat sinks are formed on the side surface of the casing.

[0019] The present invention has the following advantages:

[0020] 1. The first permanent magnet is driven by the second permanent magnet, so that the blades rotate to generate water flow, and the heat on the surface of the casing is transferred to the box and / or the radiator through the liquid. 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 and thus reduces the cost of liquid cooling of the magnetic levitation pump;

[0021] 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 liquid flow rate according to the rotation speed of the second permanent magnet, and then changing the heat dissipation speed, without the need to use additional sensors and control systems to control the rotation speed of the blades;

[0022] 3. The heat is transferred to the box and / or radiator through the liquid, and the box and / or radiator dissipates the heat into the air, dissipating the heat in the first groove that is difficult to dissipate, while increasing the heat dissipation area, thereby increasing the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 : Schematic diagram of the three-dimensional structure of a vertical magnetic levitation pump (the pump head is not shown);

[0025] Figure 2 : Figure 1 Schematic diagram of the three-dimensional structure of the medium water tank;

[0026] Figure 3 : Figure 1 Schematic diagram of the three-dimensional structure after removing the water tank;

[0027] Figure 4 : Schematic diagram of the top view of the vertical magnetic levitation pump (the pump head is not shown);

[0028] Figure 5: Schematic diagram of the cross-sectional structure of the water circulation device;

[0029] Figure 6 : Figure 4 Schematic diagram of the cross-sectional structure at AA in the middle;

[0030] Figure 7 : Schematic diagram of the three-dimensional structure of a horizontal magnetic levitation pump (the pump head is not shown);

[0031] Figure 8 : Figure 7 Schematic diagram of the three-dimensional structure after removing the water tank;

[0032] Fig. 9 : Figure 7 Schematic diagram of the three-dimensional structure of the medium water tank;

[0033] Fig.10 : Schematic diagram of the rear view structure of a horizontal magnetic levitation pump;

[0034] Fig.11 : Fig.10 Schematic diagram of the cross-sectional structure at the middle BB;

[0035] Fig.12 : Schematic diagram of the cross-sectional structure of a horizontal magnetic levitation pump. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and examples:

[0037] 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.

[0038] 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.

[0039] 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.

[0040] like Figures 1 to 12 As shown, a passive liquid-cooled magnetic levitation pump includes a magnetic levitation motor and a pump head 9, the magnetic levitation motor and the pump head 9 are fixedly connected, and also includes a water circulation device and a water tank 7, the water circulation device includes a first permanent magnet 1, a rotor 2 and a mounting frame 3, the mounting frame 3 is fixedly connected to the housing 6 of the magnetic levitation motor, the second permanent magnet 91 inside the pump head 9 drives the first permanent magnet 1 to rotate relative to the mounting frame 3, the rotor 2 is fixedly connected to the first permanent magnet 1, the rotor 2 includes blades 22, a second cavity 702 is formed between the water tank 7 and the outer side of the housing 6 of the magnetic levitation motor, the liquid absorbs heat in the second cavity 702 and the housing 6, and the blades 22 are used to drive the liquid in the water tank 7 to flow, and the heated liquid flows to the water tank 7 and / or the radiator, and the heat is transferred to the water tank 7 and / or the radiator and then dissipated into the air. It should be noted that the liquid is a conventional heat-conducting liquid such as water or heat-conducting oil.

[0041] Furthermore, the mounting frame 3 further includes a fixed shaft 32, the first permanent magnet 1 rotates around the fixed shaft 32, and 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.

[0042] 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.

[0043] 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; 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, and the first permanent magnet 1 rotates synchronously with the second permanent magnet 91 through the attraction of opposite poles. Figure 6 The following embodiments all adopt the second driving mode.

[0044] Furthermore, a first groove 63 is formed at one end of the housing 6 of the magnetic levitation motor away from the pump head 9 , and the water circulation device is located inside the first groove 63 .

[0045] Furthermore, the mounting frame 3 further includes a base 31, the base 31 is integrally formed with the end of the fixed shaft 32, and the base 31 is fixedly connected to the bottom of the first groove 63 (i.e., the end of the cylindrical groove). Preferably, the base 31 and the housing 6 can be fixedly connected by conventional fixing methods such as threaded connection, brazing, clamping, or bonding.

[0046] 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.

[0047] Furthermore, the water circulation device 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.

[0048] Furthermore, the water circulation device further comprises 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 respectively in contact with both ends of the bearing 4, 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.

[0049] Further, the water tank 7 includes a box body 71 and a tube body 72, the box body 71 and the tube body 72 are fixedly connected, the tube body 72 is inserted into the first groove 63, the second cavity 702 includes a first gap, a second gap and a third gap, the first gap is located between the end of the tube body 72 and the bottom of the first groove 63, the second gap is located between the side of the tube body 72 and the side wall of the first groove 63, the third gap is located between the box body 71 and the end of the casing 6 away from the pump head 9, and the two ends of the second gap are respectively connected to the first gap and the third gap, a first cavity 701 is formed inside the water tank 7, one end of the tube body inner cavity 703 inside the tube body 72 is connected to the third gap, and the other end is connected to the first cavity 701 or the water outlet 74 of the water tank 7, and a connecting through hole 711 is formed at one end of the box body 71 close to the casing 6, and the connecting through hole 711 connects the first cavity 701 and the second cavity 702.

[0050] There are three ways to dissipate heat using liquids:

[0051] The first is heat dissipation of the box 71, that is, the liquid in the second cavity 702 exchanges heat with the housing 6 to absorb heat, and then, driven by the rotating blades 22, the liquid flows into the inner cavity 703 of the tube body. After passing through the inner cavity 703 of the tube body, the liquid enters the first cavity 701, and the liquid exchanges heat with the part of the box 71 away from the housing 6 to release heat, thereby transferring heat to the box 71, and the box 71 dissipates heat into the air. The cooled liquid flows back to the second cavity 702 from the connecting through hole 711, and the liquid circulates back and forth in this way to quickly extract the heat from the housing 6.

[0052] This method does not require an additional radiator, and the heat of the housing 6 is transferred to the box body 71 through the heat transfer by liquid. Since the air exchange speed in the first groove 63 of the housing 6 in the prior art is very slow, it is difficult for the heat in the groove of the housing 6 to dissipate, which will cause the temperature to be too high. In addition, the area of ​​contact between the housing 6 and the air is fixed and difficult to increase, while the box body 71 can increase the area of ​​contact with the air to improve the heat dissipation efficiency, so transferring the heat to the box body 71 through liquid and then dissipating the heat is faster than dissipating the heat only by the surface of the housing 6.

[0053] The second type is heat dissipation by a radiator (not shown in the figure), that is, the liquid passes through the first cavity 701 from the water inlet 73 or not, enters the second cavity 702 to exchange heat with the housing 6 and absorb heat, and then driven by the rotating blades 22, the liquid flows into the inner cavity 703 of the tube body. After passing through the inner cavity 703 of the tube body, the liquid passes through the first cavity 701 (such as Fig.11 as shown) or without passing through the first cavity 701 (as shown Fig.12As shown), the liquid finally flows out of the water tank 71 from the first cavity 701, and enters the radiator through or without passing through the radiator. The radiator exchanges heat with the air and transfers the heat to the air to cool the liquid. After the liquid cools down, it returns to the water inlet 73 to complete the cycle. It should be noted that the radiator is a radiator of the prior art, such as a fin-tube heat exchanger.

[0054] This method has a larger heat dissipation area than relying solely on the box body 71 and has a better heat dissipation effect, but occupies a larger volume.

[0055] The third type is combined heat dissipation, which uses both the first and second heat dissipation methods. Figure 6 As shown, the water inlet 73 and the water outlet 74 corresponding to the first cavity 701 are respectively connected to the radiator (not shown in the figure).

[0056] Furthermore, a protrusion 62 is formed at the end of the casing 6 away from the pump head 9, and a flow channel groove 621 is formed between the protrusions 62. The protrusion 62 increases the heat exchange area, and the flow channel groove 621 increases the flow distance of the liquid during heat exchange, thereby exchanging more heat between the casing 6 and the liquid.

[0057] Furthermore, a second heat sink 631 is formed on the inner side of the side wall of the first groove 63 , so as to increase the heat exchange speed between the first groove 63 and the liquid.

[0058] Furthermore, a third heat sink is included. The third heat sink is integrally formed with the outer side surface of the water tank 7. The third heat sink is used to increase the heat exchange area with the air and accelerate the heat dissipation speed.

[0059] Furthermore, a plurality of first heat sinks 61 are formed on the side of the housing 6 , and part of the outer side of the housing 6 is used to directly dissipate heat into the air.

[0060] 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.

[0061] 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 liquid-cooled magnetic levitation pump, comprising a magnetic levitation motor and a pump head (9), wherein the magnetic levitation motor and the pump head (9) are fixedly connected, characterized in that: It also comprises a water circulation device and a water tank (7), the water circulation device comprising a first permanent magnet (1), a rotor (2) and a mounting frame (3), the mounting frame (3) being fixedly connected to the casing (6) of the magnetic levitation motor, the second permanent magnet (91) inside the pump head (9) driving the first permanent magnet (1) to rotate relative to the mounting frame (3), the rotor (2) being fixedly connected to the first permanent magnet (1), the rotor (2) comprising blades (22), a second cavity (702) being formed between the water tank (7) and the outer side of the casing (6) of the magnetic levitation motor, the blades (22) being used to drive the flow of liquid in the water tank (7); 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 water circulation device is located inside the first groove (63).

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

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

4. A passive liquid-cooled magnetic levitation pump according to claim 2, 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 liquid-cooled magnetic levitation pump according to claim 4, characterized in that: The water circulation device further comprises 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 the outer ring of the bearing (4) being fixedly connected to the fixed shaft (32) and the cylinder (21) respectively.

6. A passive liquid-cooled magnetic levitation pump according to claim 5, characterized in that: The water circulation device further comprises a limit block (5), wherein the limit block (5) is fixedly connected to the fixed shaft (32), the fixed shaft (32) forms a limit surface (321), and the limit block (5) and the limit surface (321) are in contact with two ends of the bearing (4) respectively.

7. The passive liquid-cooled magnetic levitation pump according to claim 1, characterized in that: The water tank (7) comprises a box body (71) and a tube body (72), the box body (71) and the tube body (72) being fixedly connected, the tube body (72) being inserted into the first groove (63), the second cavity (702) comprising a first gap, a second gap and a third gap, the first gap being located between an end of the tube body (72) and a groove bottom of the first groove (63), the second gap being located between a side surface of the tube body (72) and a side wall of the first groove (63), and the third gap being located between the box body (71) and the housing (6) away from the pump head ( 9), the two ends of the second gap are respectively connected to the first gap and the third gap, a first cavity (701) is formed inside the water tank (7), one end of the inner cavity (703) of the tube body (72) is connected to the third gap, and the other end is connected to the first cavity (701) or the water outlet (74) of the water tank (7), and a connecting through hole (711) is formed at one end of the box body (71) close to the housing (6), and the connecting through hole (711) connects the first cavity (701) and the second cavity (702).

8. A passive liquid-cooled magnetic levitation pump according to claim 7, characterized in that: A protrusion (62) is formed at the end of the housing (6) away from the pump head (9), and flow channel grooves (621) are formed between the protrusions (62).

9. The passive liquid-cooled magnetic levitation pump according to claim 1, characterized in that: It also includes a radiator, the water tank (7) is formed with a water inlet (73) and a water outlet (74), and the radiator is respectively connected to the water inlet (73) and the water outlet (74).

10. The passive liquid-cooled magnetic levitation pump according to claim 1, characterized in that: A second heat sink (631) is formed on the inner side of the side wall of the first groove (63).

11. The passive liquid-cooled magnetic levitation pump according to claim 7, characterized in that: It also includes a third heat sink, which is integrally formed with the outer side surface of the water tank (7).

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