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; the thrust disc ventilation holes are opposite to the first coil grooves in the axial direction, and the thrust disc ventilation holes are 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, and particularly relates 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 structure 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, and the heat dissipation of internal components cannot be more effectively achieved, especially the heat dissipation of axial magnetic bearings is insufficient, which affects the stable operation of magnetic levitation air compressors.

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft. An essential axial force-bearing component on the rotating shaft is the thrust disc. The axial magnetic bearing and the thrust disc are made of a solid pure iron structure, with relatively large self-loss, general thermal conductivity, and a 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 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 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] Axial stator one, axial stator two and 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 radially outer part one and a radially inner part one. The radially outer part one and the radially inner part one are spaced apart in the radial direction of the axial stator one, and a coil slot one is formed therebetween. A coil one is arranged in the coil slot one. The thrust disc ventilation holes are axially opposite to the position of the coil slot one, and the thrust disc ventilation holes are not opposite to the magnetic pole positions of the axial stator one.

[0008] In some embodiments,

[0009] Further included is a first pressing plate, which is located between the first axial stator and the thrust disk, and one axial end face of the first pressing plate is in contact with the first radial outer part of the first axial stator, and the other axial end face of the first pressing plate faces the thrust disk;

[0010] The magnetic pole position of the first axial stator includes the part where the first pressing plate faces the thrust disk and the part where the first radial inner part faces the thrust disk. There is a first gap between the first pressing plate and the first radial inner part. The thrust disk ventilation hole is axially opposite to the first gap, and the radial dimension of the first gap is greater than or equal to the radial dimension of the thrust disk ventilation hole.

[0011] In some embodiments,

[0012] In any radial cross-section of the thrust disk, the cross-sectional area of the magnetic circuit flowing position of the first axial stator = the radial cross-sectional area of the part of the thrust disk opposite to the first axial stator - the cross-sectional area of the thrust disk ventilation hole ≥ the cross-sectional area of the magnetic pole position of the first axial stator.

[0013] In some embodiments,

[0014] Inside the first coil slot, there is a second gap between the radial inner side of the first coil and the first radial inner part, forming a first gas flow path.

[0015] The first axial stator further includes a first axial outer part, which is arranged away from the thrust disk relative to the first coil in the axial direction of the magnetic suspension bearing. Inside the first coil slot, there is also a third gap between the first axial outer part and the first coil, forming a bearing stator ventilation slot 1.

[0016] A bearing stator ventilation hole 1 is provided on the first axial outer part of the first axial stator. The bearing stator ventilation hole 1 penetrates from one axial end face of the first axial outer part to the other axial end face to communicate with the bearing stator ventilation slot 1 and further communicate with the thrust disk ventilation hole through the first gas flow path.

[0017] In some embodiments,

[0018] Along the axial direction of the thrust disk, the thrust disk ventilation holes are inclined hole structures whose extending directions are not parallel to the axis of the thrust disk. From the observation direction of the axial end face of the intake side of the thrust disk towards the axial end face of the outlet side, the rotation direction of the thrust disk is towards the first rotation direction, and the extending direction of the thrust disk ventilation holes from the axial end face of the intake side of the thrust disk towards the axial end face of the outlet side is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0019] In some embodiments,

[0020] There are multiple thrust disk ventilation holes, and the multiple thrust disk ventilation holes are arranged at intervals along the circumferential direction of the thrust disk, and the extending direction of each thrust disk ventilation hole from the axial end face of the intake side of the thrust disk towards the axial end face of the outlet side is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disk.

[0021] In some embodiments,

[0022] 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 arranged at intervals 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. The thrust disk ventilation holes are axially opposite to the position of the coil slot two, and the thrust disk ventilation holes are not axially opposite to the magnetic pole positions of the axial stator two.

[0023] In some embodiments,

[0024] It further includes a pressing plate two. The pressing plate two is located between the axial stator two and the thrust disk. One axial end face of the pressing plate two is connected to the radially outer part two of the axial stator two, and the other axial end face of the pressing plate two faces the thrust disk;

[0025] The magnetic pole positions of the axial stator two include the part where the pressing plate two faces the thrust disk and the part where the radially inner part two faces the thrust disk. There is a fourth gap between the pressing plate two and the radially inner part two. The thrust disk ventilation holes are axially opposite to the fourth gap, and the radial dimension of the fourth gap is greater than or equal to the radial dimension of the thrust disk ventilation holes.

[0026] In some embodiments,

[0027] In each radial section of the thrust disk, the cross-sectional area of the magnetic circuit flowing position of the axial stator two = the radial cross-sectional area of the part where the thrust disk faces the axial stator two - the cross-sectional area of the thrust disk ventilation holes ≥ the cross-sectional area of the magnetic pole positions of the axial stator two.

[0028] In some embodiments,

[0029] Inside the second coil slot, there is a fifth gap between the radial inner side of the second coil and the second radial inner side portion, forming a second gas flow path.

[0030] The axial stator two further includes an axial outer side portion two, which is arranged away from the thrust disc relative to the second coil in the axial direction of the magnetic bearing. Inside the second coil slot, there is also a sixth gap between the axial outer side portion two and the second coil, forming a bearing stator ventilation slot two.

[0031] On the axial outer side portion two of the axial stator two, there is a bearing stator ventilation hole two, which penetrates from one axial end face of the axial outer side portion two to the other axial end face to communicate with the bearing stator ventilation slot two and further communicate with the thrust disc ventilation hole through the second gas flow path.

[0032] In some embodiments,

[0033] The thrust disc ventilation holes are formed in multiple rows in the radial direction, and the number of rows is N. The number of slots of the first coil slot is n, and N≥n≥1. Or, the number of slots of the second coil slot (23) is n', and N≥n'≥1.

[0034] In some embodiments,

[0035] On the thrust disc, there is also a thrust disc air passing hole, which also penetrates from one axial end face of the thrust disc to the other axial end face. And the thrust disc air passing hole is located at a position opposite to the radial inner circumference of the first radial inner side portion. The thrust disc air passing hole is located outside the inner peripheral wall of the thrust disc and radially inside the thrust disc ventilation hole.

[0036] The present invention also provides a magnetic levitation rotating machine, which includes the aforementioned magnetic bearing.

[0037] A magnetic bearing and a magnetic levitation rotating machine provided by the present invention have the following beneficial effects:

[0038] 1. The utility model realizes self - active air suction and heat exchange through the thrust disk ventilation holes opened on the thrust disk. By means of high - speed rotation, it increases the gas flow rate introduced, accelerates 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, improves the cooling and heat dissipation effect of the magnetic levitation bearing. And the thrust disk ventilation holes are not opposite to the magnetic pole positions of the axial stator 1, which enables no holes to be drilled at the position of the thrust disk end face facing the magnetic pole, 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 levitation axial supporting force, realizing improved heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force, and effectively reducing the influence of gas force on the axial force. The utility model also preferably sets the thrust disk ventilation holes at the position corresponding 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 positions, further avoid affecting the magnetic circuit, and the thrust disk ventilation holes are connected to the ventilation paths at both ends without obstruction, and the air flow resistance at both ends of the thrust disk is small and the fluidity is good.

[0039] 2. The utility model further sets, in any radial cross - section of the thrust disk, the relationship: 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 relative to the axial stator 1 - the cross - sectional area of the thrust disk ventilation holes ≥ the cross - sectional area of the magnetic pole position of the axial stator 1, so that other magnetic circuit parts on the thrust disk different from the magnetic pole positions will not show 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 magnetic levitation supporting force. The utility model also sets the thrust disk ventilation holes 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 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 introduced, realizing self - active ventilation and heat exchange of the thrust disk, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance and energy efficiency at the same time. At the same time, in cooperation with the bearing stator ventilation holes and ventilation grooves (multiple gas flow paths) in the axial stator coil slots, it can further accelerate the gas flow in the cavity of the axial stator coil slots, realizing the effective independent heat dissipation of the axial coil and the thrust disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a longitudinal sectional view of Embodiment 1 of the magnetic levitation bearing of the utility model;

[0041] Figure 2 is Figure 1 the plane structure diagram of the thrust disk structure in

[0042] Figure 3 is a longitudinal sectional view of Embodiment 2 of the magnetic levitation bearing of the present utility model;

[0043] Figure 4 is Figure 3 a plan view of the thrust disk structure in

[0044] Figure 5 a three-dimensional structure diagram of Axial Stator I of the present utility model.

[0045] The reference numerals are shown as:

[0046] 1. Axial Stator I; 11. Radial Outer Part I; 12. Radial Inner Part I; 13. Coil Slot I; 14. Axial Outer Part I; 2. Axial Stator II; 21. Radial Outer Part II; 22. Radial Inner Part II; 23. Coil Slot II; 24. Axial Outer Part II; 3. Thrust Disk; 4. Press Plate I; 4'. Press Plate II; 5. Coil I; 5'. Coil II;

[0047] 01. Thrust Disk Vent Hole; 03. Bearing Stator Vent Hole I; 03'. Bearing Stator Vent Hole II; 04. Bearing Stator Vent Groove I; 04'. Bearing Stator Vent Groove II; 05. First Gap; 06. First Gas Flow Path; 07. Fourth Gap; 08. Second Gas Flow Path. Detailed Embodiment

[0048] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of 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 of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0049] It should be noted that the terms used herein are only for describing the 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.

[0050] 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 invention. At the same time, it should be understood that, for the sake of convenience in description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization 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.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation terms 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 cannot be construed as limiting the protection scope of the present invention; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0052] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under 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 should be made for the spatial relative descriptions used here.

[0053] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without otherwise stating, the above words have no special meaning, and thus cannot be construed as limiting the protection scope of the present invention.

[0054] such asFigures 1-5 As shown in the figure, the present utility model provides a magnetic levitation bearing, which includes:

[0055] Axial stator one 1, axial stator two 2 and thrust disk 3. In the axial direction of the magnetic levitation bearing, the thrust disk 3 is arranged between the axial stator one 1 and the axial stator two 2. A thrust disk ventilation hole 01 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 01 is axially opposite to the position of the coil slot one 13, and the thrust disk ventilation hole 01 is not axially opposite to the magnetic pole position of the axial stator one 1.

[0056] Through the thrust disk ventilation hole opened on the thrust disk in the present utility model, self-acting air suction and heat exchange are realized through high rotation speed, the gas flow rate introduced is increased, the cooling of the axial magnetic bearing is accelerated, the thrust disk itself can be actively cooled and the cooling flow rate is increased to accelerate the heat dissipation of the axial coil, the cooling and heat dissipation effect of the magnetic levitation bearing is improved. And the thrust disk ventilation hole is not axially opposite to the magnetic pole position of the axial stator one, so that no hole is punched at the position of the thrust disk end face facing the magnetic pole, and the cooling air cannot directly reach the magnetic pole gap position, which can effectively avoid the influence of the cooling gas and the opening on the magnetic furnace structure, thereby avoiding insufficient magnetic levitation axial supporting force, realizing the improvement of the 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.

[0057] In some embodiments,

[0058] It further includes a pressing plate one 4. The pressing plate one 4 is located between the axial stator one 1 and the thrust disk 3. One axial end face of the pressing 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 pressing plate one 4 faces the thrust disk 3.

[0059] The magnetic pole position of the axial stator one 1 includes the part where the pressing plate one 4 faces the thrust disk 3 and the part where the radially inner part one 12 faces the thrust disk 3. A first gap 05 is provided between the pressing plate one 4 and the radially inner part one 12. The thrust disk ventilation hole 01 is axially opposite to the first gap 05, and the dimension of the first gap 05 in the radial direction is greater than or equal to the radial dimension of the thrust disk ventilation hole 01.

[0060] The present utility model also preferably sets the ventilation holes of the thrust disc at the position directly opposite to the coil between the upper and lower magnetic poles in the axial direction, 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 by the ventilation holes of the thrust disc, 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 can also make the air flow resistance at both ends of the thrust disc small and the fluidity good.

[0061] In some embodiments,

[0062] In any radial cross-section of the thrust disc 3, 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 disc opposite to the axial stator 1 - the cross-sectional area of the ventilation holes 01 of the thrust disc ≥ the cross-sectional area of the magnetic pole position of the axial stator 1.

[0063] The present utility model further sets, in any radial cross-section of the thrust disc, the relationship: 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 disc opposite to the axial stator 1 - the cross-sectional area of the ventilation holes of the thrust disc ≥ the cross-sectional area of the magnetic pole position of the axial stator 1, so that other magnetic circuit parts on the thrust disc different from the magnetic pole position will not appear magnetic field saturation prior to the magnetic pole position, ensure the formation of a normal magnetic flux loop, and ensure the continuous and effective provision of the magnetic levitation supporting force.

[0064] In some embodiments,

[0065] Inside the coil slot 13, there is a second gap between the radial inner side of the coil 5 and the radial inner part 12, forming a first gas flow path 06.

[0066] The axial stator 1 further includes an axial outer part 14, and the axial outer part 14 is arranged away from the thrust disc 3 relative to the coil 5 in the axial direction of the magnetic levitation bearing. Inside the coil slot 13, there is also a third gap between the axial outer part 14 and the coil 5, forming a bearing stator ventilation slot 04;

[0067] A bearing stator ventilation hole 03 is provided on the axial outer part 14 of the axial stator 1, and the bearing stator ventilation hole 03 penetrates from one axial end face of the axial outer part 14 to the other axial end face to communicate with the bearing stator ventilation slot 04, and further communicates with the ventilation holes 01 of the thrust disc through the first gas flow path 06.

[0068] The present utility model further sets the bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the axial stator coil slot, which can further accelerate the gas flow in the cavity of the axial stator coil slot and realize the effective independent heat dissipation of the axial coil and the thrust disc.

[0069] In some embodiments,

[0070] Along the axial direction of the thrust disc 3, the thrust disc ventilation hole 01 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 end face on the intake side of the thrust disc 3 towards the axial end face on the outlet side, the rotation direction of the thrust disc 3 is the first rotation direction, and the extending direction of the thrust disc ventilation hole 01 from the axial end face on the intake side of the thrust disc towards the axial end face on the outlet side 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 thrust disc ventilation hole to extend from the axial end face on the intake side towards the axial end face on the outlet side in 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 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.

[0072] In some embodiments,

[0073] There are multiple thrust disc ventilation holes 01, and the multiple thrust disc ventilation holes 01 are arranged at intervals along the circumferential direction of the thrust disc 3. Moreover, the extending direction of each thrust disc ventilation hole 01 from the axial end face on the intake side towards the axial end face on the outlet side is towards the second rotation direction, and all are opposite to the first rotation direction of the thrust disc 3.

[0074] The present utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust disc adopts an inclined hole solution to achieve its own active air intake and heat exchange through high rotational 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 during 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.

[0075] In some embodiments,

[0076] 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 spaced apart in the radial direction of the axial stator two 2, and a coil slot two 23 is formed therebetween. A coil two 5' is disposed in the coil slot two 23. The thrust disk ventilation hole 01 is axially opposite to the position of the coil slot two 23, and the thrust disk ventilation hole 01 is not opposite to the magnetic pole position of the axial stator two 2.

[0077] In the present utility model, by further making the thrust disk ventilation hole not opposite to the magnetic pole position of the axial stator two, it is possible to prevent the thrust disk end face from being punched 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, which can further effectively avoid the influence of the cooling gas and the opening on the magnetic furnace structure, further avoid insufficient magnetic levitation axial supporting force, further achieve improved heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, further improve the magnetic levitation supporting force, and effectively reduce the influence of the gas acting force on the axial force.

[0078] In some embodiments,

[0079] It further includes a pressing plate two 4'. The pressing plate two 4' is located between the axial stator two 2 and the thrust disk 3. One axial end face of the pressing plate two 4' is connected to the radially outer part two 21 of the axial stator two 2, and the other axial end face of the pressing plate two 4' is opposite to the thrust disk 3.

[0080] The magnetic pole position of the axial stator two 2 includes the part where the pressing plate two 4' is opposite to the thrust disk 3 and the part where the radially inner part two 22 is opposite to the thrust disk 3. There is a fourth gap 07 between the pressing plate two 4' and the radially inner part two 22. The thrust disk ventilation hole 01 is axially opposite to the fourth gap 07, and the dimension of the fourth gap 07 in the radial direction is greater than or equal to the radial dimension of the thrust disk ventilation hole 01.

[0081] In some embodiments,

[0082] In each radial cross-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 01 ≥ the cross-sectional area of the magnetic pole position of the axial stator two 2.

[0083] 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 positioned right opposite the coil, and further, the aperture size of the ventilation holes of the thrust disc is ≤ the radial spacing between the upper and lower magnetic poles of the axial stator II, which can enable the ventilation holes of the thrust disc to 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 can also make the air flow resistance at both ends of the thrust disc small and the fluidity good.

[0084] In some embodiments,

[0085] Inside the coil slot II 23, there is a fifth gap between the radial inner side of the coil II 5' and the radial inner part II 22, forming a second gas flow path 08.

[0086] The axial stator II 2 further includes an axial outer part II 24, and the axial outer part II 24 is arranged away from the thrust disc 3 relative to the coil II 5' in the axial direction of the magnetic suspension bearing. Inside the coil slot II 23, there is also a sixth gap between the axial outer part II 24 and the coil II 5', forming a bearing stator ventilation slot II 04'.

[0087] A bearing stator ventilation hole II 03' is arranged on the axial outer part II 24 of the axial stator II 2, and the bearing stator ventilation hole II 03' penetrates from one axial end face of the axial outer part II 24 to the other axial end face to communicate with the bearing stator ventilation slot II 04', and further communicates with the thrust disc ventilation hole 01 through the second gas flow path 08.

[0088] In the present utility model, by further arranging the bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the coil slots of the axial stator II, the gas flow in the cavity of the coil slots of the axial stator II can be further accelerated, and effective independent heat dissipation of the axial coil and the thrust disc can be achieved.

[0089] In some embodiments,

[0090] The thrust disc ventilation holes 01 are formed in multiple rows in the radial direction, the number of rows is N, the number of slots of the coil slot I 13 is n, and N≥n≥1, or the number of slots of the coil slot II 23 is n', and N≥n'≥1.

[0091] The axial magnetic bearing of the present utility model preferably adopts active ventilation cooling. The thrust disk is installed on the rotor. Oblique holes are provided between the two magnetic poles of the thrust disk, and several oblique holes are opened in the circumferential direction of the thrust disk. The air inlet direction is opposite to the rotation direction of the rotor. When the rotor drives the thrust disk 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 gas flow rate introduced, realizing the active ventilation heat exchange of the thrust disk itself, accelerating the gas flow, and at the same time cooperating with the ventilation holes and ventilation grooves in the axial stator coil slots to accelerate the gas flow in the cavities of the axial stator coil slots, realizing the effective independent heat dissipation of the axial coil and the thrust disk. Assuming the number of coil slots is n and the number of rows of oblique holes in the radial direction is N, the number of rows of oblique holes N of the thrust disk is N≥1, and preferably the number of rows of oblique holes N≥n.

[0092] According to the principle of the axial magnetic levitation bearing, the relative position between the thrust disk 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 disk faces the magnetic pole directly 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 the 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 position where the magnetic circuit passes through ≥ the cross-sectional area of the magnetic pole position. If the opening position of the thrust disk is within the magnetic circuit, in any radial cross-section, the cross-sectional area of the position where the magnetic circuit passes through = the radial circumferential cross-sectional area of the relative part of the thrust disk and the bearing stator - the cross-sectional area of the ventilation holes of the thrust disk ≥ the cross-sectional area of the magnetic pole position. Preferably, it is located at the position directly opposite to the coil between the upper and lower axial magnetic poles, the aperture size ≤ the radial spacing between the upper and lower axial magnetic poles of the stator, and is connected to the ventilation paths at both ends without obstruction. The air flow resistance at both ends of the thrust disk is small and the fluidity is good.

[0093] In some embodiments,

[0094] A thrust disk air passing hole (not shown) is further provided on the thrust disk 3. The thrust disk air passing hole also penetrates from one axial end face of the thrust disk 3 to the other axial end face, and the thrust disk air passing hole is located at a position opposite to the radial inner circumference of the radial inner part 12, and the thrust disk air passing hole is located outside the inner peripheral wall of the thrust disk 3 and radially inside the thrust disk ventilation hole 01.

[0095] The present utility model also further increases the flow area and flow rate of the air flow passing through the thrust disk by providing a thrust disk air passing hole at the position between the thrust disk located inside the axial stator and the rotor, enabling the thrust disk to be further cooled and dissipated, and further improving the cooling and heat dissipation performance and cooling effect on the thrust disk, the rotor, and the axial stator.

[0096] For the heat dissipation of the entire system of the present utility model, an active pure air-cooled heat dissipation system is preferably adopted. The cold air is driven by a coaxial impeller at the other end of the main impeller, or the rotor rotates to suck in air centrifugally, or the main impeller leaks air in. There is no need for an additional heat dissipation drive motor. The flow rate of the cold air for heat dissipation is adjusted by the motor speed, and there is no need for 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.

[0097] The beneficial effects of the present utility model are as follows:

[0098] 1. For the high-heat-generating component of the present utility model, inclined holes are provided in the thrust disc and are matched with axial coil ventilation grooves. The negative pressure is used to suck out the heat through the inclined hole flow channel, which can actively cool the thrust disc itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil. The active pure air-cooled heat dissipation system reduces the heat dissipation cost, and the targeted ventilation of the heat-generating components can effectively accelerate the cooling and improve the reliability.

[0099] 2. The present utility model also cooperates with the overall flow channel structure layout of the machine, and conducts targeted ventilation and heat dissipation on the heat-generating components, realizing the effective ventilation and cooling of the overall heat-generating components of the magnetic levitation rotating machine, and improving the stability of the magnetic levitation system; realizing an integrated high-efficiency pure air-cooled heat dissipation system, which can ensure that the magnetic levitation rotating machine 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 heat dissipation system has high reliability.

[0100] The present utility model also provides a magnetic levitation rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator or a compressor, etc.), which includes the aforementioned magnetic levitation bearing.

[0101] Figure 1 、 Figure 3The following shows the internal axial bearing cooling path of the magnetic levitation machine (preferably a blower) of the present utility model. Bearing stator ventilation holes are provided on both the first / second axial stators. Bearing stator ventilation grooves are formed in the coil slots, preferably in a radial, annular, spiral or other shapes. Oblique holes (thrust disk ventilation holes 01) are formed in the thrust disk 3. The thrust disk oblique holes are located at the position facing the coil between the axial inner and outer magnetic poles, corresponding to the ventilation position of the wire slot. This cooling path passes from the bearing stator ventilation hole 03 through the bearing stator ventilation groove 04, the inner circle of the axial coil, between the axial inner and outer magnetic poles, then through the thrust disk oblique holes, between the axial inner and outer magnetic poles, the inner circle of the axial coil, the bearing stator ventilation groove 04' and finally discharges from the bearing stator ventilation hole 03'. During operation, the air intake direction of the thrust disk oblique holes is opposite to the rotation direction of the rotor. The thrust disk uses negative pressure to suck out the heat dissipation gas, increasing the gas flow rate, accelerating the heat exchange between the thrust disk and the axial coil, and cooperating with the overall cooling path of the scheme to achieve an effective heat dissipation effect. To make the thrust disk intake air under negative pressure, the air intake direction needs to be always opposite to the rotation direction of the rotor. Therefore, the rotation direction of the thrust disk oblique holes is related to the air intake direction of the thrust disk and the rotation direction of the rotor. If the left end of the thrust disk intakes air and the rotor rotates clockwise when viewed from the right end, the thrust disk has right-handed oblique holes. If the left end of the thrust disk intakes air and the rotor rotates counterclockwise when viewed from the right end, it has left-handed oblique holes. Vice versa. If the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0102] 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 in 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 of this technology, without departing from the technical principle of the present utility model, several improvements and variations can still be made, and these improvements and variations should also be regarded as within the protection scope of the present utility model.

Claims

1. A magnetic bearing, characterized in that: include: An axial stator (1), an axial stator (2) and a thrust plate (3); in the axial direction of the magnetic bearing, the thrust plate (3) is arranged between the axial stator (1) and the axial stator (2); a thrust plate ventilation hole (01) is arranged on the thrust plate (3) from one axial end face to the other axial end face; the axial stator (1) comprises a radial outer portion (11) and a radial inner portion (12); the radial outer portion (11) and the radial inner portion (12) are arranged at intervals in the radial direction of the axial stator (1), and a coil slot (13) is formed between the two; a coil (5) is arranged in the coil slot (13); the thrust plate ventilation hole (01) is opposite to the position of the coil slot (13) in the axial direction, and the thrust plate ventilation hole (01) is not opposite to the magnetic pole position of the axial stator (1).

2. The magnetic bearing according to claim 1, characterized in that: It also includes a pressure plate (4), the pressure plate (4) being located between the axial stator (1) and the thrust plate (3), and an axial end surface of the pressure plate (4) being connected to the radial outer side portion (11) of the axial stator (1), and the other axial end surface of the pressure plate (4) being opposite to the thrust plate (3); The magnetic pole position of the axial stator (1) includes a portion of the pressure plate (4) opposite to the thrust disk (3) and a portion of the radial inner portion (12) opposite to the thrust disk (3); a first gap (05) is provided between the pressure plate (4) and the radial inner portion (12); the thrust disk ventilation hole (01) is opposite to the first gap (05) in the axial direction, and a radial dimension of the first gap (05) is greater than or equal to a radial dimension of the thrust disk ventilation hole (01).

3. The magnetic bearing according to claim 2, characterized in that: In any radial cross section of the thrust disk (3), the cross-sectional area of ​​the magnetic path flow position of the axial stator (1) = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator (1) - the cross-sectional area of ​​the thrust disk ventilation hole (01) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator (1).

4. The magnetic bearing according to claim 1, characterized in that: Inside the coil slot 1 (13), a second gap is provided between the radial inner side of the coil 1 (5) and the radial inner side portion 1 (12), forming a first gas flow path (06). The axial stator (1) further comprises an axial outer portion (14), which is arranged in the axial direction of the magnetic bearing relative to the coil (5) and away from the thrust plate (3), and inside the coil slot (13), there is also a third gap between the axial outer portion (14) and the coil (5), forming a bearing stator ventilation slot (04); A bearing stator ventilation hole (03) is provided on the axial outer side (14) of the axial stator (1). The bearing stator ventilation hole (03) extends from one axial end surface of the axial outer side (14) to the other axial end surface to communicate with the bearing stator ventilation groove (04), and further communicates with the thrust plate ventilation hole (01) through the first gas flow path (06).

5. The magnetic bearing according to claim 1, characterized in that: Along the axial direction of the thrust plate (3), the thrust plate ventilation hole (01) is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate (3); when observing from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side, the rotation direction of the thrust plate (3) is toward a first rotation direction; the thrust plate ventilation hole (01) extends from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side toward a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

6. The magnetic bearing according to claim 5, characterized in that: There are a plurality of thrust plate ventilation holes (01), which are arranged at intervals along the circumferential direction of the thrust plate (3), and an extension direction of each thrust plate ventilation hole (01) from an axial end face on an air inlet side of the thrust plate toward an axial end face on an air outlet side is oriented toward a second rotation direction, which is opposite to the first rotation direction of the thrust plate (3).

7. The magnetic bearing according to claim 1, characterized in that: The axial stator 2 (2) comprises a radial outer portion 2 (21) and a radial inner portion 2 (22), wherein the radial outer portion 2 (21) and the radial inner portion 2 (22) are spaced apart in the radial direction of the axial stator 2 (2), and a coil slot 2 (23) is formed therebetween, a coil 2 (5') is arranged in the coil slot 2 (23), the thrust plate ventilation hole (01) is opposite to the position of the coil slot 2 (23) in the axial direction, and the thrust plate ventilation hole (01) is not opposite to the magnetic pole position of the axial stator 2 (2).

8. The magnetic bearing according to claim 7, characterized in that: It also includes a second pressure plate (4'), the second pressure plate (4') is located between the second axial stator (2) and the thrust plate (3), and one axial end surface of the second pressure plate (4') is connected to the second radial outer portion (21) of the second axial stator (2), and the other axial end surface of the second pressure plate (4') is opposite to the thrust plate (3); The magnetic pole position of the axial stator 2 (2) includes a portion of the pressure plate 2 (4') opposite to the thrust plate (3), and a portion of the radial inner portion 2 (22) opposite to the thrust plate (3); a fourth gap (07) is provided between the pressure plate 2 (4') and the radial inner portion 2 (22); the thrust plate ventilation hole (01) and the fourth gap (07) are opposite to each other in the axial direction, and a radial dimension of the fourth gap (07) is greater than or equal to a radial dimension of the thrust plate ventilation hole (01).

9. The magnetic bearing according to claim 8, characterized in that: In each radial cross section of the thrust disk (3), the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 (2) = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator 2 (2) - the cross-sectional area of ​​the thrust disk ventilation hole (01) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2 (2).

10. The magnetic bearing according to claim 7, characterized in that: Inside the coil slot 2 (23), a fifth gap is provided between the radial inner side of the coil 2 (5') and the radial inner portion 2 (22), forming a second gas flow path (08). The axial stator 2 (2) further comprises an axial outer portion 2 (24), the axial outer portion 2 (24) being arranged in the axial direction of the magnetic bearing relative to the coil 2 (5') and away from the thrust plate (3), and inside the coil slot 2 (23), there is also a sixth gap between the axial outer portion 2 (24) and the coil 2 (5'), forming a bearing stator ventilation slot 2 (04'); A bearing stator ventilation hole 2 (03') is provided on the axial outer side 2 (24) of the axial stator 2 (2). The bearing stator ventilation hole 2 (03') extends from one axial end surface of the axial outer side 2 (24) to the other axial end surface to communicate with the bearing stator ventilation groove 2 (04'), and is further connected to the thrust plate ventilation hole (01) through the second gas flow path (08).

11. The magnetic bearing according to claim 7, characterized in that: The thrust plate ventilation holes (01) are formed into multiple rows in the radial direction, the number of rows is N, the number of slots of the coil slot one (13) is n, and N≥n≥1, or the number of slots of the coil slot two (23) is n', and N≥n'≥1.

12. The magnetic bearing according to claim 1, characterized in that: The thrust plate (3) is also provided with a thrust plate air hole, and the thrust plate air hole also penetrates from one axial end face of the thrust plate (3) to the other axial end face, and the thrust plate air hole is located at a position opposite to the radial inner periphery of the radial inner portion (12), and the thrust plate air hole is located on the outer side of the inner peripheral wall of the thrust plate (3) and on the radial inner side of the thrust plate ventilation hole (01).

13. A magnetically suspended rotating machine, characterized in that: The invention comprises the magnetic bearing according to any one of claims 1 to 12.

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