Magnetic suspension bearing and magnetic suspension rotating machine

Abstract

The utility model provides a magnetic suspension bearing and magnetic suspension rotating machinery, the magnetic suspension bearing includes: axial stator no. 1, axial stator no. 2 and thrust disc, in the axial direction of magnetic suspension bearing, the thrust disc is arranged between axial stator no. Thrust disc ventilation holes are formed in the thrust disc from one axial end face to the other axial end face in a penetrating mode, the first axial stator comprises a first radial outer side part and a first radial inner side part, the first radial outer side part and the first radial inner side part are arranged in the radial direction of the first axial stator in a spaced mode, a first coil groove is formed between the first radial outer side part and the first radial inner side part, and a first coil is arranged in the first coil groove; one end, located on one axial end face of the thrust disc, of the first thrust disc air inlet hole is opposite to the position of the first coil groove in the axial direction, and one end of the first thrust disc air inlet hole is not opposite to the magnetic pole position of the first axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic levitation bearings, in particular to a magnetic levitation bearing and a magnetic levitation rotating machine. Background Art

[0002] At present, the heat dissipation of magnetic levitation rotating machines mainly relies on external cooling equipment, usually external cooling fans, water cooling systems, heat exchangers, etc. The equipment maintenance cost is high, the structural system is complex, and potential safety hazards are increased. Or in the form of negative pressure, air is sucked from the magnetic levitation rotating machine to guide heat out, which cannot more effectively achieve the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearings is insufficient, affecting the stable operation of magnetic levitation air compressors.

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft. It is necessary to have an axial force-bearing component on the rotating shaft, which is the thrust disc. The axial magnetic bearing and the thrust disc are made of a pure iron solid structure, with relatively large self-loss, general thermal conductivity and narrow space. If not effectively cooled, it will generate serious heat. Usually, in order to avoid excessive temperature rise of the axial magnetic bearing, forced air cooling is often applied externally to dissipate heat from the magnetic bearing. The cooling air is input from the outside and passes through the gap between the bearing stator and the thrust disc to dissipate heat from the axial magnetic bearing, but the heat dissipation efficiency is not high.

[0004] Due to the technical problems such as poor cooling and heat dissipation of the magnetic levitation bearing inside the rotating machine in the prior art, the utility model researches and designs a magnetic levitation bearing and a magnetic levitation rotating machine. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect of poor cooling and heat dissipation of the magnetic levitation bearing inside the rotating machine in the prior art, so as to provide a magnetic levitation bearing and a magnetic levitation rotating machine.

[0006] To solve the above problems, the utility model provides a magnetic levitation bearing, which includes:

[0007] An axial stator one, an axial stator two and a thrust disc. In the axial direction of the magnetic levitation bearing, the thrust disc is arranged between the axial stator one and the axial stator two. Thrust disc ventilation holes are arranged through the thrust disc from one axial end face to the other axial end face. The axial stator one includes a radial outer part one and a radial inner part one. The radial outer part one and the radial inner part one are arranged at intervals in the radial direction of the axial stator one, and a coil slot one is formed between the two. A coil one is arranged in the coil slot one;

[0008] The thrust disk ventilation holes include a first thrust disk air inlet hole extending from one axial end face of the thrust disk towards the interior of the thrust disk, and a second thrust disk air inlet hole extending from the other axial end face of the thrust disk towards the interior of the thrust disk. One end of the first thrust disk air inlet hole located inside the thrust disk is communicated with one end of the second thrust disk air inlet hole located inside the thrust disk. After being communicated, it is then communicated to the outer circumference of the thrust disk through a thrust disk air outlet hole. One end of the first thrust disk air inlet hole located at one axial end face of the thrust disk is axially opposite to the position of the coil slot 1, and the one end of the first thrust disk air inlet hole is not opposite to the magnetic pole position of the axial stator 1.

[0009] In some embodiments,

[0010] It further includes a first cover plate, which is located between the axial stator 1 and the thrust disk. One axial end face of the first cover plate is in contact with the first radial outer part of the axial stator 1, and the other axial end face of the first cover plate is opposite to the thrust disk.

[0011] The magnetic pole position of the axial stator 1 includes the part where the first cover plate is opposite to the thrust disk and the part where the first radial inner part is opposite to the thrust disk. There is a first ventilation groove between the first cover plate and the first radial inner part. The first thrust disk air inlet hole is axially opposite to the first ventilation groove, and the radial dimension of the first ventilation groove is greater than or equal to the radial dimension of the first thrust disk air inlet hole.

[0012] In some embodiments,

[0013] In any radial cross-section of the thrust disk, the cross-sectional area of the position where the magnetic circuit of the axial stator 1 flows through = the radial cross-sectional area of the part of the thrust disk opposite to the axial stator 1 - the cross-sectional area of the thrust disk ventilation holes - the cross-sectional area of the thrust disk air outlet holes ≥ the cross-sectional area of the magnetic pole position of the axial stator 1.

[0014] In some embodiments,

[0015] An axial stator inner ring hole 1 is opened at a position on the first radial inner part opposite to the first ventilation groove, so that the axial stator inner ring hole 1 is communicated with the first ventilation groove, and further communicated to the thrust disk air outlet hole through the first thrust disk air inlet hole. The intake air flow flows to the thrust disk air outlet hole through the axial stator inner ring hole 1, the first ventilation groove and the first thrust disk air inlet hole in sequence.

[0016] In some embodiments,

[0017] Along the axial direction of the thrust disc, the first thrust disc air inlet hole is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disc. From the observation direction from one axial end face of the thrust disc to the other axial end face, the rotation direction of the thrust disc is the first rotation direction, and the extending direction of the first thrust disc air inlet hole from the axial one end face to the axial other end face is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0018] In some embodiments,

[0019] There are multiple first thrust disc air inlet holes, and the multiple first thrust disc air inlet holes are arranged at intervals along the circumferential direction of the thrust disc, and the extending direction of each first thrust disc air inlet hole from the axial one end face to the axial other end face is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disc.

[0020] In some embodiments,

[0021] The axial stator two includes a radially outer part two and a radially inner part two. The radially outer part two and the radially inner part two are spaced apart in the radial direction of the axial stator two, and a coil slot two is formed therebetween. A coil two is arranged in the coil slot two. One end of the second thrust disc air inlet hole located at the axial other end face of the thrust disc is axially opposite to the position of the coil slot two, and this end of the second thrust disc air inlet hole is not opposite to the magnetic pole position of the axial stator two.

[0022] In some embodiments,

[0023] It further includes a cover plate two, the cover plate two is located between the axial stator two and the thrust disc, and one axial end face of the cover plate two is connected to the radially outer part two of the axial stator two, and the other axial end face of the cover plate two is connected to the thrust disc;

[0024] The magnetic path flowing position cross-sectional area of the axial stator two in each radial cross-section of the thrust disc = the radial cross-sectional area of the part of the thrust disc opposite to the axial stator two - the cross-sectional area of the thrust disc ventilation hole - the cross-sectional area of the thrust disc air outlet hole ≥ the cross-sectional area of the magnetic pole position of the axial stator two.

[0025] In some embodiments,

[0026] In each radial cross-section of the thrust disc, the cross-sectional area of the position where the magnetic path of the axial stator two flows through = the radial cross-sectional area of the part of the thrust disc opposite to the axial stator two - the cross-sectional area of the thrust disc ventilation hole - the cross-sectional area of the thrust disc air outlet hole ≥ the cross-sectional area of the magnetic pole position of the axial stator two.

[0027] In some embodiments,

[0028] An axial stator inner ring hole two is provided at a position on the radially inner part two opposite to the ventilation groove two, so that the axial stator inner ring hole two communicates with the ventilation groove two, and further communicates with the thrust disk air outlet hole through the second thrust disk air inlet hole, and the intake air flow flows to the thrust disk air outlet hole through the axial stator inner ring hole two, the ventilation groove two and the second thrust disk air inlet hole in sequence.

[0029] In some embodiments,

[0030] Along the axial direction of the thrust disk, the second thrust disk air inlet hole is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disk. From the observation direction of the axial other end face of the thrust disk towards its axial one end face, the rotation direction of the thrust disk is towards the third rotation direction, and the extending direction of the second thrust disk air inlet hole from the axial other end face to the axial one end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0031] In some embodiments,

[0032] The second thrust disk air inlet holes are multiple, and the multiple second thrust disk air inlet holes are arranged at intervals along the circumferential direction of the thrust disk, and the extending direction of each second thrust disk air inlet hole from the axial other end face to the axial one end face is towards the fourth rotation direction, and is opposite to the third rotation direction of the thrust disk.

[0033] In some embodiments,

[0034] The first thrust disk air inlet hole, the thrust disk air outlet hole and the second thrust disk air inlet hole correspond to each other one by one to form a set of air outlet units, and there are multiple sets of the air outlet units, and the multiple sets of air outlet units are arranged at intervals along the circumferential direction of the thrust disk.

[0035] In some embodiments,

[0036] When the thrust disk satisfies magnetic saturation, the axial width of the magnetic circuit circulation area is at least N, and the axial aperture of the thrust disk air outlet hole = the axial thickness of the thrust disk - N.

[0037] In some embodiments,

[0038] An axial stator three is further provided on the outer periphery of the axial stator one and the axial stator two, and a stator outer ring hole is further provided at a position of the axial stator three opposite to the thrust disk air outlet hole of the thrust disk, and it can be used to connect with the thrust disk air outlet hole and exhaust outward.

[0039] The present utility model further provides a magnetic levitation rotating machine, which includes the aforementioned magnetic levitation bearing.

[0040] The magnetic levitation bearing and the magnetic levitation rotating machine provided by the present utility model have the following beneficial effects:

[0041] 1. By means of the thrust disk ventilation holes and the thrust disk air outlet holes provided on the thrust disk of the present utility model, the thrust disk ventilation holes include a first thrust disk air inlet hole extending from one axial end face of the thrust disk towards the inside of the thrust disk and a second thrust disk air inlet hole extending from the other axial end face of the thrust disk towards the inside of the thrust disk, and it can achieve self-actuated air suction and heat exchange through high rotational speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, can actively cool the thrust disk itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improve the cooling and heat dissipation effect on the magnetic levitation bearing, and make the first thrust disk air inlet hole not opposite to the magnetic pole position of the axial stator one, which can prevent the thrust disk end face from punching holes at the magnetic pole position directly facing the axial stator one, so that the cooling air cannot directly reach the magnetic pole gap position, can effectively avoid the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial supporting force, realizing the improvement of heat dissipation and cooling of the magnetic levitation bearing while avoiding the influence on the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force, and effectively reducing the influence of the gas acting force on the axial force; the present utility model also preferably sets the thrust disk ventilation holes at the position directly opposite to the coil between the upper and lower axial magnetic poles, and the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can enable the thrust disk ventilation holes to further effectively avoid the magnetic pole position, further avoid the influence on the magnetic circuit, and the thrust disk ventilation holes are connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0042] 2. The present utility model further sets a relationship within any radial cross-section of the thrust disc, i.e., the cross-sectional area of the magnetic path flow-through position of the axial stator one = the radial cross-sectional area of the relative part of the thrust disc and the axial stator one - the cross-sectional area of the thrust disc ventilation holes - the cross-sectional area of the thrust disc air outlet holes ≥ the cross-sectional area of the magnetic pole position of the axial stator one, so that other magnetic path parts on the thrust disc different from the magnetic pole position will not experience magnetic field saturation prior to the magnetic pole position, ensuring the formation of a normal magnetic flux loop and the continuous and effective provision of magnetic levitation supporting force; the present utility model also sets the first thrust disc air inlet hole to extend from one axial end face to the other axial end face in a direction towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disc). When the rotor drives the thrust disc to rotate at high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increasing the gas flow rate, realizing the active ventilation and heat exchange of the thrust disc itself, accelerating the gas flow, saving energy consumption, improving the heat dissipation performance while also improving the energy efficiency; at the same time, in cooperation with the ventilation groove one and the axial stator inner ring hole one (multiple gas flow paths) in the axial stator coil slot, the gas flow in the cavity of the axial stator coil slot can be further accelerated, realizing the effective independent heat dissipation of the axial coil and the thrust disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is the longitudinal sectional perspective view of the magnetic levitation bearing of the present utility model;

[0044] Figure 2 is the longitudinal sectional front view of the magnetic levitation bearing of the present utility model;

[0045] Figure 3 is Figure 1 the three-dimensional internal structure diagram of the thrust disc structure in

[0046] The reference numerals are shown as:

[0047] 1, axial stator one; 11, radial outer part one; 12, radial inner part one; 13, coil slot one; 14, axial outer part one; 2, axial stator two; 21, radial outer part two; 22, radial inner part two; 23, coil slot two; 24, axial outer part two; 3, thrust disc; 4, cover plate one; 4', cover plate two; 5, coil one; 5', coil two; 6, axial stator three;

[0048] 01, first thrust disc air inlet hole; 02, second thrust disc air inlet hole; 03, axial stator inner ring hole one; 03', axial stator inner ring hole two; 04, ventilation groove one; 04', ventilation groove two; 05, thrust disc air outlet hole; 06, stator outer ring hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] Next, in conjunction with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. 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 "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0052] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0053] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figure is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations of the spatial relative descriptions used herein will be made.

[0054] 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. Without additional statements, the above terms have no special meanings and thus should not be construed as limiting the protection scope of the present utility model.

[0055] As Figures 1-3 shown, the present utility model provides a magnetic levitation bearing, which includes:

[0056] Axial stator 1, axial stator 2, and thrust disk 3. In the axial direction of the magnetic levitation bearing, the thrust disk 3 is disposed between the axial stator 1 and the axial stator 2. A thrust disk ventilation hole penetrates through the thrust disk 3 from one axial end face to the other axial end face. The axial stator 1 includes a radially outer portion 11 and a radially inner portion 12. The radially outer portion 11 and the radially inner portion 12 are spaced apart in the radial direction of the axial stator 1, and a coil slot 13 is formed therebetween. A coil 5 is disposed in the coil slot 13;

[0057] The thrust disk ventilation hole includes a first thrust disk air inlet hole 01 extending from one axial end face of the thrust disk 3 into the interior of the thrust disk 3, and a second thrust disk air inlet hole 02 extending from the other axial end face of the thrust disk 3 into the interior of the thrust disk 3. One end of the first thrust disk air inlet hole 01 located inside the thrust disk 3 is communicated with one end of the second thrust disk air inlet hole 02 located inside the thrust disk 3. After being communicated, it is then communicated to the outer periphery of the thrust disk 3 through a thrust disk air outlet hole 05. One end of the first thrust disk air inlet hole 01 located at one axial end face of the thrust disk 3 is axially opposite to the position of the coil slot 13, and the said end of the first thrust disk air inlet hole 01 is not axially opposite to the magnetic pole position of the axial stator 1.

[0058] Through the thrust disk ventilation holes and the thrust disk air outlet holes formed in the thrust disk, the thrust disk ventilation holes include a first thrust disk air inlet hole extending from one axial end face of the thrust disk towards the inside of the thrust disk and a second thrust disk air inlet hole extending from the other axial end face of the thrust disk towards the inside of the thrust disk. It can achieve self-acting air suction and heat exchange through high speed rotation, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, actively cool the thrust disk itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improve the cooling and heat dissipation effect of the magnetic suspension bearing, and make the first thrust disk air inlet hole not opposite to the magnetic pole position of the axial stator 1, which can prevent the thrust disk end face from punching holes at the magnetic pole position directly facing the axial stator 1, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoiding the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoiding insufficient magnetic suspension axial supporting force, achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence of gas acting force on the axial force.

[0059] In some embodiments,

[0060] It further includes a first cover plate 4, the first cover plate 4 is located between the axial stator 1 and the thrust disk 3, and one axial end face of the first cover plate 4 is connected to the outer radial part 11 of the axial stator 1, and the other axial end face of the first cover plate 4 faces the thrust disk 3;

[0061] The magnetic pole positions of the axial stator 1 include the part where the first cover plate 4 faces the thrust disk 3 and the part where the inner radial part 12 faces the thrust disk 3. There is a first ventilation groove 04 between the first cover plate 4 and the inner radial part 12. The first thrust disk air inlet hole 01 is axially opposite to the first ventilation groove 04, and the radial dimension of the first ventilation groove 04 is greater than or equal to the radial dimension of the first thrust disk air inlet hole 01.

[0062] The present utility model preferably arranges the thrust disk ventilation holes at the position directly opposite to the coil between the upper and lower axial magnetic poles, and the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can further effectively avoid the magnetic pole position for the first thrust disk air inlet hole, further avoid affecting the magnetic circuit, and the thrust disk ventilation holes are connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0063] In some embodiments,

[0064] In any radial cross-section of the thrust disk 3, the cross-sectional area of the position through which the magnetic circuit of the first axial stator 1 flows = the radial cross-sectional area of the part of the thrust disk opposite to the first axial stator 1 - the cross-sectional area of the ventilation holes in the thrust disk - the cross-sectional area of the air outlet holes 05 in the thrust disk ≥ the cross-sectional area of the magnetic pole positions of the first axial stator 1.

[0065] The present utility model further sets a relationship in any radial cross-section of the thrust disk: the cross-sectional area of the position through which the magnetic circuit of the first axial stator flows = the radial cross-sectional area of the part of the thrust disk opposite to the first axial stator - the cross-sectional area of the ventilation holes in the thrust disk - the cross-sectional area of the air outlet holes in the thrust disk ≥ the cross-sectional area of the magnetic pole positions of the first axial stator, so that other magnetic circuit parts on the thrust disk different from the magnetic pole positions will not have magnetic field saturation prior to the magnetic pole positions, ensuring the formation of a normal magnetic flux loop and ensuring the continuous and effective provision of the magnetic levitation supporting force.

[0066] In some embodiments,

[0067] An inner axial stator ring hole 03 is provided at a position on the first radially inner part 12 opposite to the ventilation groove 04, so that the inner axial stator ring hole 03 communicates with the ventilation groove 04, and further communicates with the thrust disk air outlet hole 05 through the first thrust disk air inlet hole 01. The intake air flow sequentially passes through the inner axial stator ring hole 03, the ventilation groove 04, and the first thrust disk air inlet hole 01 and flows to the thrust disk air outlet hole 05.

[0068] The present utility model further can further accelerate the gas flow in the cavity of the axial stator coil groove through the ventilation groove 01 provided on the first radially inner part and the inner axial stator ring hole 03 (multiple gas flow paths), realizing the effective self-cooling of the axial coil and the thrust disk.

[0069] In some embodiments,

[0070] Along the axial direction of the thrust disk 3, the first thrust disk air inlet hole 01 has an inclined hole structure whose extending direction is not parallel to the axis of the thrust disk 3. From the viewing direction of the axial end face of the thrust disk 3 towards its other axial end face, the rotation direction of the thrust disk 3 is the first rotation direction, and the extending direction of the first thrust disk air inlet hole 01 from the axial end face to the other axial end face is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0071] The present utility model also sets the air inlet holes of the first thrust disk to extend from one axial end face to the other axial end face in a direction towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disk). When the rotor drives the thrust disk to rotate at a high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increasing the flow rate of the introduced gas, realizing the active ventilation and heat exchange of the thrust disk itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance while also improving the energy efficiency.

[0072] For the present utility model to facilitate negative pressure air intake, the direction of the inner ring air inlet is opposite to the rotation direction. The air inlet holes are >90° from the rotation direction in the circumferential direction, and the air outlet holes are ≥90° from the rotation direction in the radial direction. There is no requirement for the hole shape. For the convenience of machining and technology, circular holes, rectangular round holes or oval holes are preferably used.

[0073] In some embodiments,

[0074] The first thrust disk air inlet holes 01 are multiple, and the multiple first thrust disk air inlet holes 01 are arranged at intervals along the circumferential direction of the thrust disk 3. Moreover, the extension direction of each first thrust disk air inlet hole 01 from one axial end face to the other axial end face is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disk 3.

[0075] The present utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust disk adopts a Y-shaped inclined hole solution to realize its own active air suction and heat exchange through high rotation speed, increasing the flow rate of the introduced gas, accelerating the cooling of the axial magnetic bearing, and at the same time cooperating with the overall active pure air cooling of the magnetically levitated rotating machine, using the coaxial impeller cooling at the other end of the main impeller or the negative pressure cooling of the rotor rotation or the leakage cooling of the main impeller. It changes from the previous external passive heat dissipation to internal active heat dissipation, improving the heat dissipation efficiency while reducing the heat dissipation cost. This cooling solution for the magnetically levitated rotating machine can effectively ventilate and dissipate heat for the motor stator, motor rotor, magnetic bearing, etc., and can also better dissipate heat for the axial magnetic bearing, improving the stability of the magnetic levitation system.

[0076] In some embodiments,

[0077] The axial stator two 2 includes a radially outer part two 21 and a radially inner part two 22. The radially outer part two 21 and the radially inner part two 22 are arranged at intervals in the radial direction of the axial stator two 2, and a coil slot two 23 is formed therebetween. A coil two 5' is arranged in the coil slot two 23. The second thrust disk air inlet hole 02 is axially opposite to the position of the coil slot two 23 at one end of the other axial end face of the thrust disk 3, and the one end of the second thrust disk air inlet hole 02 is not opposite to the magnetic pole position of the axial stator two 2.

[0078] Furthermore, in the present utility model, by making the position of the second thrust disk air inlet hole on the other axial end face of the thrust disk not opposite to the magnetic pole position of the axial stator two, it is possible to prevent the thrust disk end face from being drilled at the position directly opposite to the magnetic pole position of the axial stator two, so that the cooling air cannot directly reach the magnetic pole gap position of the axial stator two. This can further effectively avoid the influence of the cooling gas and the holes on the structure of the magnetic furnace, further prevent insufficient magnetic levitation axial support force, further achieve enhanced heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, further improve the magnetic levitation support force, and effectively reduce the influence of gas force on the axial force.

[0079] In some embodiments,

[0080] It further includes a second cover plate 4', the second cover plate 4' is located between the axial stator two 2 and the thrust disk 3, and one axial end face of the second cover plate 4' is connected to the outer radial part two 21 of the axial stator two 2, and the other axial end face of the second cover plate 4' is connected to the thrust disk 3;

[0081] The magnetic pole position of the axial stator two 2 includes the part where the second cover plate 4' is connected to the thrust disk 3 and the part where the inner radial part two 22 is connected to the thrust disk 3. There is a second ventilation groove 04' between the second cover plate 4' and the inner radial part two 22. The second thrust disk air inlet hole 02 is axially opposite to the second ventilation groove 04', and the radial dimension of the second ventilation groove 04' is greater than or equal to the radial dimension of the second thrust disk air inlet hole 02.

[0082] The present utility model preferably sets the second thrust disk air inlet hole at the position directly opposite to the coil between the upper and lower magnetic poles of the axial stator two, and the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator. This can further effectively avoid the magnetic pole position, further prevent affecting the magnetic circuit, and the thrust disk ventilation hole is connected to the ventilation paths at both ends without obstruction, and it can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0083] In some embodiments,

[0084] In each radial section of the thrust disk 3, the cross-sectional area of the position where the magnetic circuit of the axial stator two 2 flows through = the radial cross-sectional area of the part of the thrust disk opposite to the axial stator two 2 - the cross-sectional area of the thrust disk ventilation hole - the cross-sectional area of the thrust disk air outlet hole 05 ≥ the cross-sectional area of the magnetic pole position of the axial stator two 2.

[0085] In the present utility model, the ventilation holes of the thrust disc are further arranged between the upper and lower magnetic poles of the axial stator II and are opposite to the coil, such that the aperture size of the ventilation holes of the thrust disc is ≤ the radial distance between the upper and lower magnetic poles of the axial stator II, which can further effectively avoid the magnetic pole positions of the axial stator II, further avoid affecting the magnetic circuit, and the ventilation holes of the thrust disc are connected to the ventilation paths at both ends without obstruction, and also can make the air flow resistance at both ends of the thrust disc small and the fluidity good.

[0086] In some embodiments,

[0087] An axial stator inner ring hole II 03' is formed at a position on the radial inner part II 22 opposite to the ventilation groove II 04', such that the axial stator inner ring hole II 03' is communicated with the ventilation groove II 04', and further communicated to the thrust disc outlet hole 05 through the second thrust disc inlet hole 02, and the intake air flow sequentially flows through the axial stator inner ring hole II 03', the ventilation groove II 04' and the second thrust disc inlet hole 02 to the thrust disc outlet hole 05.

[0088] In the present utility model, further through the ventilation groove II and the axial stator inner ring hole II (multiple gas flow paths) arranged on the radial inner part II, the gas flow in the coil slot cavity of the axial stator II can be further accelerated, and effective independent heat dissipation of the axial coil and the thrust disc can be realized.

[0089] In some embodiments,

[0090] Along the axial direction of the thrust disc 3, the second thrust disc inlet hole 02 is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disc 3. From the observation direction of the axial other end face of the thrust disc 3 towards its axial one end face, the rotation direction of the thrust disc 3 is towards the third rotation direction, and the extending direction of the second thrust disc inlet hole 02 from the axial other end face to the axial one end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0091] In the present utility model, by setting the second thrust disc inlet hole such that its extending direction from the axial other end face to the axial one end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction (the rotation direction of the thrust disc), when the rotor drives the thrust disc to rotate at a high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increasing the flow rate of the introduced gas, realizing the active ventilation and heat exchange of the thrust disc itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance while also improving the energy efficiency;

[0092] Along the direction from one axial end face to the other axial end face, the first rotation direction is the same as the third rotation direction, the fourth rotation direction is the same as the second rotation direction. The first and second thrust disc air inlet holes and the thrust disc air outlet hole together form a Y-shaped inclined hole, with air intake from both sides towards the middle and discharged through the thrust disc air outlet hole.

[0093] For facilitating negative pressure air intake, the direction from the inner ring air inlet is opposite to the rotation direction. The air intake hole is >90° from the rotation direction in the circumferential direction, and the air outlet hole is ≥90° from the rotation direction in the radial direction. There is no requirement for the hole shape. For facilitating machining and process, circular holes, rectangular round holes or oval holes are preferred.

[0094] In some embodiments,

[0095] The second thrust disc air inlet holes 02 are multiple, and the multiple second thrust disc air inlet holes 02 are arranged at intervals along the circumferential direction of the thrust disc 3. And the extending direction of each second thrust disc air inlet hole 02 from the other axial end face to one axial end face is towards the fourth rotation direction, all opposite to the third rotation direction of the thrust disc 3.

[0096] In some embodiments,

[0097] The first thrust disc air inlet hole 01, the thrust disc air outlet hole 05 and the second thrust disc air inlet hole 02 correspond to each other one by one to form a set of air outlet units. There are multiple sets of the air outlet units, and the multiple sets of air outlet units are arranged at intervals along the circumferential direction of the thrust disc 3.

[0098] By setting multiple air outlet units in the present utility model, the air flow circulation area and circulation flow rate can be increased in the circumferential direction, further improving the cooling and heat dissipation effect on the magnetic suspension bearing.

[0099] In some embodiments,

[0100] When the thrust disc 3 satisfies magnetic saturation, the axial width of the magnetic circuit circulation area is at least N, and the axial aperture of the thrust disc air outlet hole 05 = the axial thickness of the thrust disc 3 - N. In the present utility model, it is preferred that when the thrust disc satisfies magnetic saturation, the axial width of the magnetic circuit circulation area is at least N, and the axial aperture of the air outlet = the thrust disc thickness - N, which can effectively ensure the largest heat dissipation channel and at the same time does not affect the axial magnetic circuit conduction.

[0101] In some embodiments,

[0102] The outer circumference of the axial stator one 1 and the axial stator two 2 also has an axial stator three 6. A stator outer ring hole 06 is also provided at a position of the axial stator three 6 opposite to the thrust disc air outlet hole 05 of the thrust disc 3, which can be used to connect with the thrust disc air outlet hole 05 and exhaust outwards.

[0103] Through the stator outer ring holes provided on the outermost axial stator III, which are opposite to the air outlet of the thrust disc, the present utility model can discharge the gas discharged from the air outlet holes of the thrust disc, enabling the gas entering from the first and second thrust disc air inlet holes that intake air from both sides to be discharged from the stator outer ring holes after cooling structures such as the coils and rotors of the magnetic levitation bearing, ensuring the smoothness of gas flow and improving the cooling effect.

[0104] The axial magnetic bearing of the present utility model preferably adopts active ventilation cooling. Several Y-shaped inclined holes are circumferentially provided on the thrust disc. Two inclined holes are drilled on both sides between the two magnetic poles of the thrust disc and converge in the middle, and then inclined holes are drilled upward to the outer ring surface of the thrust disc. The inner ring surface of the axial stator is provided with through holes to cooperate with the air inlet of the Y-shaped hole of the thrust disc. The air inlet direction of the inclined hole of the thrust disc is opposite to the rotation direction of the rotor. When the rotor drives the thrust disc to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, increasing the flow rate of the introduced gas, realizing the active ventilation heat exchange of the thrust disc itself, and at the same time cooperating with the inner ring hole of the axial stator to accelerate the gas flow in the cavity of the axial stator, realizing the effective independent heat dissipation of the axial magnetic bearing.

[0105] According to the principle of the axial magnetic levitation bearing, the relative position between the thrust disc and the axial magnetic pole is the force output position, that is, no holes can be drilled at the position where the end face of the thrust disc faces the magnetic pole to avoid insufficient axial force. At the same time, the cooling air cannot directly reach the magnetic pole gap position, which can reduce the influence of gas force on the axial force. According to the requirements of axial magnetic circuit circulation, to ensure that magnetic saturation does not occur at other positions prior to the magnetic pole position, in the radial circumferential direction, the cross-sectional area of the magnetic circuit flow-through position ≥ the cross-sectional area of the magnetic pole position. If the hole opening position of the thrust disc is within the magnetic circuit, in any radial cross-section, the cross-sectional area of the magnetic circuit flow-through position = the radial circumferential cross-sectional area of the relative part of the thrust disc and the bearing stator - the cross-sectional area of the ventilation holes of the thrust disc - the cross-sectional area of the air outlet holes of the thrust disc ≥ the cross-sectional area of the magnetic pole position. It is preferably located at the position directly opposite to the coil between the upper and lower axial magnetic poles, the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, and is connected to the ventilation paths at both ends without obstruction. The air flow resistance at both ends of the thrust disc is small and the fluidity is good.

[0106] The entire system preferably adopts an active pure air-cooled heat dissipation system. The cold air is driven by a coaxial impeller at the other end of the main impeller or the centrifugal intake of the rotor rotation or the leakage intake of the main impeller, without an additional heat dissipation drive motor. The flow rate of the heat dissipation cold air is adjusted by the motor speed, without an additional controller. The overall internal flow channel layout guides the cold air to each component for targeted heat dissipation. The entire heat dissipation system has a simple structure and an efficient and reliable heat dissipation process.

[0107] The beneficial effects of the present utility model are as follows:

[0108] 1. The utility model is directed to a high-heat generating component with Y-shaped inclined holes provided in a thrust disk. Heat is sucked out through the Y-shaped inclined hole flow path by negative pressure. Oblique holes are drilled on both sides between the two magnetic poles of the thrust disk and converge to the middle, and then oblique holes are drilled upward to the outer ring surface of the thrust disk. The inner ring surface of the axial stator is provided with through holes to cooperate with the air inlet of the Y-shaped hole of the thrust disk, which can actively cool and accelerate its own heat dissipation, increase the cooling flow rate and does not affect the axial magnetic circuit.

[0109] 2. The utility model provides an integrated high-efficiency pure air-cooled heat dissipation system. The active pure air-cooled heat dissipation system reduces the heat dissipation cost. Targeted ventilation of the heat-generating components can effectively accelerate cooling and improve reliability, and can ensure that the magnetic levitation rotating machinery has sufficient heat dissipation air volume under various working conditions. The cold air is directly driven by the motor rotor, the control logic is simple, and the reliability of the heat dissipation system is high.

[0110] The utility model also provides a magnetic levitation rotating machinery (preferably a rotating machinery such as a motor, a blower, a ventilator or a compressor, etc.), which includes the aforementioned magnetic levitation bearing.

[0111] Figure 1 The internal axial bearing cooling path of the magnetic levitation rotating machinery (preferably a blower) of the utility model is shown. The first thrust disk air inlet hole 01 (oblique hole), the second thrust disk air inlet hole 02 (oblique hole), and the thrust disk air outlet hole 05 (oblique hole) form the Y-shaped inclined holes of the thrust disk. The inner ring hole 03 of the axial stator and the ventilation groove 04 cooperate with the air inlet of the Y-shaped hole of the thrust disk. This cooling path is: the cooling gas passes through the inner ring hole 03 of the axial stator (the inner ring hole 03' of the axial stator) → the ventilation groove 04 (the ventilation groove 04'), and is collected from the first thrust disk air inlet hole 01 and the second thrust disk air inlet hole 02 on both sides of the thrust disk and discharged from the thrust disk air outlet hole 05, effectively dissipating heat from the axial stator and the axial winding. During operation, the air inlet direction of the first and thrust disk inlet oblique holes is opposite to the rotation direction of the rotor. The gas in the ventilation groove is sucked into the thrust disk oblique hole by negative pressure and then discharged for heat dissipation. This cooling path achieves an effective self-cooling effect. In order to make the thrust disk intake air under negative pressure, the intake air direction needs to be always opposite to the rotation direction of the rotor. Therefore, the rotation direction of the thrust disk oblique hole is related to the thrust disk intake air direction and the rotor rotation direction. If the left end of the thrust disk intakes air and the rotor rotates clockwise when viewed from the right end, the thrust disk is a right-handed oblique hole. If the left end of the thrust disk intakes air and the rotor rotates counterclockwise when viewed from the right end, it is a left-handed oblique hole. Vice versa. If the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0112] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model. The above is only the preferred implementation manner of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as within the protection scope of the present utility model.

Claims

1. A magnetic levitation bearing, characterized in that: Comprising: Axial stator one (1), axial stator two (2) and thrust disk (3). In the axial direction of the magnetic suspension bearing, the thrust disk (3) is arranged between the axial stator one (1) and the axial stator two (2). A thrust disk ventilation hole runs through the thrust disk (3) from one axial end face to the other axial end face. The axial stator one (1) includes a radially outer part one (11) and a radially inner part one (12). The radially outer part one (11) and the radially inner part one (12) are spaced apart in the radial direction of the axial stator one (1), and a coil slot one (13) is formed therebetween. A coil one (5) is arranged in the coil slot one (13); The thrust disk ventilation hole includes a first thrust disk air inlet hole (01) extending from one axial end face of the thrust disk (3) towards the inside of the thrust disk (3), and a second thrust disk air inlet hole (02) extending from the other axial end face of the thrust disk (3) towards the inside of the thrust disk (3). One end of the first thrust disk air inlet hole (01) located inside the thrust disk (3) is communicated with one end of the second thrust disk air inlet hole (02) located inside the thrust disk (3). After being communicated, it is then communicated to the outer periphery of the thrust disk (3) through a thrust disk air outlet hole (05). One end of the first thrust disk air inlet hole (01) located at one axial end face of the thrust disk (3) is axially opposite to the position of the coil slot one (13), and this end of the first thrust disk air inlet hole (01) is not opposite to the magnetic pole position of the axial stator one (1).

2. The magnetic suspension bearing according to claim 1, wherein: It further includes a cover plate one (4). The cover plate one (4) is located between the axial stator one (1) and the thrust disk (3). One axial end face of the cover plate one (4) is connected to the radially outer part one (11) of the axial stator one (1), and the other axial end face of the cover plate one (4) is opposite to the thrust disk (3); The magnetic pole position of the axial stator one (1) includes the part of the cover plate one (4) opposite to the thrust disk (3) and the part of the radially inner part one (12) opposite to the thrust disk (3). There is a ventilation groove one (04) between the cover plate one (4) and the radially inner part one (12). The first thrust disk air inlet hole (01) is axially opposite to the ventilation groove one (04), and the radial dimension of the ventilation groove one (04) is greater than or equal to the radial dimension of the first thrust disk air inlet hole (01).

3. The magnetic suspension bearing according to claim 2, wherein: In any radial cross-section of the thrust disk (3), the cross-sectional area of the position where the magnetic circuit of the axial stator one (1) flows through = the radial cross-sectional area of the part of the thrust disk opposite to the axial stator one (1) - the cross-sectional area of the thrust disk ventilation hole - the cross-sectional area of the thrust disk air outlet hole (05) ≥ the cross-sectional area of the magnetic pole position of the axial stator one (1).

4. The magnetic suspension bearing according to claim 2, wherein: An axial stator inner ring hole one (03) is provided at a position on the radial inner part one (12) opposite to the ventilation groove one (04), so that the axial stator inner ring hole one (03) communicates with the ventilation groove one (04), and further communicates with the thrust disc outlet hole (05) through the first thrust disc air inlet hole (01). The intake air flow flows to the thrust disc outlet hole (05) successively through the axial stator inner ring hole one (03), the ventilation groove one (04) and the first thrust disc air inlet hole (01).

5. The magnetic suspension bearing according to claim 1, wherein: Along the axial direction of the thrust disc (3), the first thrust disc air inlet hole (01) is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disc (3). From the viewing direction from one axial end face of the thrust disc (3) to the other axial end face, the rotation direction of the thrust disc (3) is the first rotation direction, and the extending direction of the first thrust disc air inlet hole (01) from the axial one end face to the axial the other end face is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

6. The magnetic suspension bearing according to claim 5, wherein: There are a plurality of the first thrust disc air inlet holes (01), and the plurality of the first thrust disc air inlet holes (01) are arranged at intervals along the circumferential direction of the thrust disc (3), and the extending direction of each of the first thrust disc air inlet holes (01) from the axial one end face to the axial the other end face is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disc (3).

7. The magnetic suspension bearing according to claim 1, wherein: The axial stator two (2) includes a radial outer part two (21) and a radial inner part two (22). The radial outer part two (21) and the radial inner part two (22) are arranged at intervals in the radial direction of the axial stator two (2), and a coil groove two (23) is formed therebetween. A coil two (5') is arranged in the coil groove two (23). One end of the second thrust disc air inlet hole (02) located at the other axial end face of the thrust disc (3) is axially opposite to the position of the coil groove two (23), and the one end of the second thrust disc air inlet hole (02) is not opposite to the magnetic pole position of the axial stator two (2).

8. The magnetic suspension bearing according to claim 7, wherein: It further includes a cover plate two (4'), the cover plate two (4') is located between the axial stator two (2) and the thrust disc (3), and one axial end face of the cover plate two (4') is connected to the radial outer part two (21) of the axial stator two (2), and the other axial end face of the cover plate two (4') is connected to the thrust disc (3); The magnetic pole positions of the axial stator two (2) include the part where the second cover plate (4') contacts the thrust disk (3) and the part where the second radially inner part (22) contacts the thrust disk (3). There is a ventilation groove two (04') between the second cover plate (4') and the second radially inner part (22). The second thrust disk air inlet hole (02) is axially opposite to the ventilation groove two (04'), and the radial dimension of the ventilation groove two (04') is greater than or equal to the radial dimension of the second thrust disk air inlet hole (02).

9. The magnetic levitation bearing according to claim 8, characterized in that: In each radial section of the thrust disk (3), the cross-sectional area of the magnetic path flowing position of the axial stator two (2) = the radial cross-sectional area of the part of the thrust disk opposite to the axial stator two (2) - the cross-sectional area of the thrust disk ventilation hole - the cross-sectional area of the thrust disk air outlet hole (05) ≥ the cross-sectional area of the magnetic pole position of the axial stator two (2).

10. The magnetic levitation bearing according to claim 8, characterized in that: An axial stator inner ring hole two (03') is provided at a position on the second radially inner part (22) opposite to the ventilation groove two (04'), so that the axial stator inner ring hole two (03') communicates with the ventilation groove two (04'), and further communicates with the thrust disk air outlet hole (05) through the second thrust disk air inlet hole (02). The intake air flow sequentially passes through the axial stator inner ring hole two (03'), the ventilation groove two (04') and the second thrust disk air inlet hole (02) and flows to the thrust disk air outlet hole (05).

11. The magnetic levitation bearing according to claim 1, characterized in that: Along the axial direction of the thrust disk (3), the second thrust disk air inlet hole (02) is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disk (3). From the observation direction of the axial other end face of the thrust disk (3) towards its axial one end face, the rotation direction of the thrust disk (3) is the third rotation direction, and the extending direction of the second thrust disk air inlet hole (02) from the axial other end face to the axial one end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

12. The magnetic levitation bearing according to claim 11, characterized in that: There are multiple second thrust disk air inlet holes (02), and the multiple second thrust disk air inlet holes (02) are arranged at intervals along the circumferential direction of the thrust disk (3), and the extending direction of each second thrust disk air inlet hole (02) from the axial other end face to the axial one end face is towards the fourth rotation direction, and is opposite to the third rotation direction of the thrust disk (3).

13. The magnetic levitation bearing according to claim 12, characterized in that: The first thrust disk air inlet hole (01), the thrust disk air outlet hole (05) and the second thrust disk air inlet hole (02) correspond to each other one by one to form a set of air outlet units. There are multiple sets of the air outlet units, and the multiple sets of air outlet units are arranged at intervals along the circumferential direction of the thrust disk (3).

14. The magnetic levitation bearing according to claim 1, wherein: When the thrust disk (3) reaches magnetic saturation, the axial width of the magnetic circuit flow area is at least N, and the axial aperture of the air outlet hole (05) of the thrust disk = the axial thickness of the thrust disk (3) - N.

15. The magnetic levitation bearing according to claim 1, wherein: An axial stator three (6) is further provided on the outer periphery of the axial stator one (1) and the axial stator two (2). A stator outer ring hole (06) is provided at a position of the axial stator three (6) opposite to the air outlet hole (05) of the thrust disk (3), which can be used to connect with the air outlet hole (05) of the thrust disk and exhaust outward.

16. A magnetic levitation rotating machine, characterized in that: Comprising the magnetic levitation bearing according to any one of claims 1-15.

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