Magnetic suspension rotating machine

Abstract

The invention provides a magnetic suspension rotating machine which comprises a cylinder body, a magnetic suspension bearing, a motor stator and a rotor, the cylinder body, the rotor and the stator are respectively provided with flow channels, in the axial direction, a thrust disc is arranged between a first axial stator and a second axial stator, and 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 at intervals in the radial direction of the first axial stator, and a first coil groove is formed between the first radial outer side part and the first radial inner side part. 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, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension bearings, and in particular to a magnetic suspension rotating machine. Background Art

[0002] At present, the heat dissipation of magnetic levitation rotating machinery is mainly external cooling equipment, usually external cooling fans, water cooling systems and heat exchangers, etc., which have high equipment maintenance costs, complex structural systems, and increased safety hazards. Or in the form of negative pressure, the air is sucked from the magnetic levitation rotating machinery to guide the heat out, which cannot more effectively achieve the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearings is not sufficient, affecting the stable operation of the magnetic levitation air compressor.

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft, and an axial force-bearing component is indispensable on the rotating shaft, which is the thrust plate. The axial magnetic bearing and the thrust plate are made of pure iron solid structure, which has relatively large self-loss, general thermal conductivity and small space. If it is 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 the heat of the magnetic bearing. The cooling air is input from the outside and dissipates the heat of the axial magnetic bearing through the gap between the bearing stator and the thrust plate, but the heat dissipation efficiency is not high.

[0004] Since the magnetic suspension bearing inside the rotating machine in the prior art has technical problems such as poor cooling and heat dissipation effect, the present invention studies and designs a magnetic suspension rotating machine. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor cooling and heat dissipation effect of the magnetic suspension bearing inside the rotating machine in the prior art, thereby providing a magnetic suspension rotating machine.

[0006] In order to solve the above problems, the present invention provides a magnetic levitation rotating machine, which includes:

[0007] A cylinder, a magnetic bearing, a motor stator and a rotor, wherein the motor stator is located at the radial outer periphery of a part of the shaft section of the rotor, the magnetic bearing, the rotor and the motor stator are all located inside the cylinder, a cylinder flow channel is axially opened on the cylinder, a motor stator flow channel is axially opened on the motor stator, and a motor rotor flow channel is formed in the rotor air gap at a portion of the rotor opposite to the motor stator, and gas can flow through the cylinder flow channel, the motor stator flow channel and the motor rotor flow channel; the magnetic bearing is located on one side of the motor stator in the axial direction and can support the rotor;

[0008] The magnetic bearing comprises an axial stator 1, an axial stator 2 and a thrust plate. In the axial direction of the magnetic bearing, the thrust plate is arranged between the axial stator 1 and the axial stator 2. The thrust plate is provided with a thrust plate ventilation hole from its axial end face 1 to its axial end face 2. The axial stator 1 comprises a radial outer portion 1 and a radial inner portion 1. The radial outer portion 1 and the radial inner portion 1 are arranged at intervals in the radial direction of the axial stator 1, and a coil slot 1 is formed between the two, and a coil 1 is arranged in the coil slot 1.

[0009] The thrust plate ventilation hole comprises a first thrust plate air inlet hole extending from one axial end face of the thrust plate toward the interior of the thrust plate, and a second thrust plate air inlet hole extending from the other axial end face of the thrust plate toward the interior of the thrust plate, one end of the first thrust plate air inlet hole located inside the thrust plate is connected with one end of the second thrust plate air inlet hole located inside the thrust plate, and after being connected, the two ends are connected to the outer periphery of the thrust plate through the thrust plate air outlet hole, and one end of the first thrust plate air inlet hole located on one axial end face of the thrust plate is opposite to and connected with the position of the coil slot 1 in the axial direction, and the cylinder flow channel, the motor stator flow channel and the motor rotor flow channel can all be connected with the thrust plate air outlet hole; and the one end of the first thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator 1.

[0010] In some embodiments,

[0011] It also includes a cover plate 1, the cover plate 1 is located between the axial stator 1 and the thrust plate, and an axial end surface of the cover plate 1 is connected to the radial outer side portion 1 of the axial stator 1, and the other axial end surface of the cover plate 1 is opposite to the thrust plate;

[0012] The magnetic pole position of the axial stator 1 includes a portion of the cover plate 1 opposite to the thrust plate, and a portion of the radial inner portion 1 opposite to the thrust plate, a ventilation groove 1 is provided between the cover plate 1 and the radial inner portion 1, the first thrust plate air inlet hole is opposite to the ventilation groove 1 in the axial direction, and a radial dimension of the ventilation groove 1 is greater than or equal to a radial dimension of the first thrust plate air inlet hole.

[0013] In some embodiments,

[0014] In any radial cross section of the thrust plate, the cross-sectional area of ​​the magnetic path flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 1 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1.

[0015] In some embodiments,

[0016] An axial stator inner ring hole 1 is provided at a position on the radial inner side 1 opposite to the ventilation groove 1, so that the axial stator inner ring hole 1 is connected to the ventilation groove 1, and further connected to the thrust plate air outlet through the first thrust plate air inlet hole, and the intake air flow flows to the thrust plate air outlet through the axial stator inner ring hole 1, the ventilation groove 1 and the first thrust plate air inlet hole in sequence;

[0017] The cylindrical flow channel can be connected to the coil slot one through the axial stator inner ring hole one, and further connected to the thrust plate air outlet hole through the first thrust plate air inlet hole.

[0018] In some embodiments,

[0019] Along the axial direction of the thrust plate, the first thrust plate air inlet hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate, and in the observation direction from one axial end face of the thrust plate to the other axial end face thereof, the rotation direction of the thrust plate is toward a first rotation direction, and the extension direction of the first thrust plate air inlet hole from one axial end face to the other axial end face is toward a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0020] In some embodiments,

[0021] There are multiple first thrust plate air inlet holes, which are arranged at intervals along the circumferential direction of the thrust plate, and an extension direction of each of the first thrust plate air inlet holes from one axial end face to the other axial end face is toward a second rotation direction, which is opposite to the first rotation direction of the thrust plate.

[0022] In some embodiments,

[0023] The axial stator 2 includes a radial outer portion 2 and a radial inner portion 2, the radial outer portion 2 and the radial inner portion 2 are spaced apart in the radial direction of the axial stator 2, and a coil slot 2 is formed therebetween, a coil 2 is arranged in the coil slot 2, the second thrust plate air inlet hole is located at one end of the other axial end surface of the thrust plate and is opposite to and connected with the position of the coil slot 2 in the axial direction, the motor stator flow channel and the motor rotor flow channel can both be connected with the second thrust plate air inlet hole; and the one end of the second thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator 2.

[0024] In some embodiments,

[0025] It also includes a second cover plate, the second cover plate is located between the second axial stator and the thrust plate, and one axial end surface of the second cover plate is connected to the second radial outer portion of the second axial stator, and the other axial end surface of the second cover plate is opposite to the thrust plate;

[0026] The magnetic pole position of the axial stator 2 includes the portion of the cover plate 2 opposite to the thrust plate, and the portion of the radial inner portion 2 opposite to the thrust plate, a ventilation groove 2 is provided between the cover plate 2 and the radial inner portion 2, the second thrust plate air inlet hole is opposite to the ventilation groove 2 in the axial direction, and the radial dimension of the ventilation groove 2 is greater than or equal to the radial dimension of the second thrust plate air inlet hole.

[0027] In some embodiments,

[0028] In each radial cross section of the thrust plate, the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 2 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2.

[0029] In some embodiments,

[0030] A second axial stator inner ring hole is provided at a position on the second radial inner side portion opposite to the second ventilation groove, so that the second axial stator inner ring hole is connected to the second ventilation groove, and further connected to the thrust plate air outlet through the second thrust plate air inlet hole, and the intake air flows through the second axial stator inner ring hole, the second ventilation groove and the second thrust plate air inlet hole in sequence to the thrust plate air outlet hole;

[0031] The motor stator flow channel and the motor rotor flow channel can both be connected to the coil slot 2 through the axial stator inner ring hole 2, and further connected to the thrust plate air outlet hole through the second thrust plate air inlet hole.

[0032] In some embodiments,

[0033] Along the axial direction of the thrust plate, the second thrust plate air inlet hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate, and when observing from the other axial end face of the thrust plate toward one axial end face, the rotation direction of the thrust plate is toward a third rotation direction, and the extension direction of the second thrust plate air inlet hole from the other axial end face to the one axial end face is toward a fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0034] In some embodiments,

[0035] There are multiple air inlet holes of the second thrust plate, which are arranged at intervals along the circumferential direction of the thrust plate, and an extension direction of each of the air inlet holes of the second thrust plate from the other axial end face to the one axial end face is toward the fourth rotation direction, which is opposite to the third rotation direction of the thrust plate.

[0036] In some embodiments,

[0037] The first thrust plate air inlet, the thrust plate air outlet and the second thrust plate air inlet correspond to each other one by one to form a group of air outlet units. There are multiple groups of air outlet units, and the multiple groups of air outlet units are arranged at intervals along the circumferential direction of the thrust plate.

[0038] In some embodiments,

[0039] When the thrust plate meets magnetic saturation, the minimum axial width of the magnetic path flow area is N, and the axial aperture of the air outlet hole of the thrust plate = the axial thickness of the thrust plate - N.

[0040] In some embodiments,

[0041] A bearing air outlet is also provided at a position of the cylinder body opposite to the thrust plate air outlet of the thrust plate, which can be used to be connected to the thrust plate air outlet and exhaust air outward.

[0042] In some embodiments,

[0043] It also includes a rear end cover, a cooling impeller, a rear housing, a barrel and a rear radial bearing, wherein the cooling impeller is arranged at one axial end of the rotor so as to rotate integrally with the rotor, the cooling impeller is arranged inside the rear end cover, an axially penetrating air inlet is arranged at the central axis position of the rear end cover, the air inlet is directly opposite to the cooling impeller, and the magnetic suspension bearing and the motor stator are both located inside the barrel;

[0044] The rear housing is axially connected between the rear end cover and the barrel, and a rear housing flow channel is axially arranged on the rear housing, one end of the rear housing flow channel can be communicated with the barrel flow channel, the motor stator flow channel and the motor rotor flow channel respectively, and the other end of the rear housing flow channel can be communicated with the impeller air outlet of the cooling impeller;

[0045] The airflow can enter the barrel flow channel, the motor stator flow channel and the motor rotor flow channel respectively through the air inlet, the cooling impeller, the interior of the rear end cover and the rear casing flow channel in sequence.

[0046] In some embodiments,

[0047] It also includes a front radial bearing, a front housing and a front end cover, wherein the front radial bearing and the front housing are both located on the axial side of the magnetic bearing away from the motor stator, a front radial bearing flow channel is provided between the front radial bearing and the outer periphery of the rotor, a front housing flow channel is provided between the front housing and the outer periphery of the rotor, the front end cover is provided on the axial side of the cylinder away from the rear end cover, and a storage space is formed between the front end cover and the front housing, a front housing channel is provided on the front housing axially penetrating therethrough, one end of the front housing channel is opposite to and connected with the storage space, and the other end is opposite to and connected with the cylinder flow channel;

[0048] The airflow can pass through the cylinder flow channel, the front shell channel, the accommodating space, the front shell flow channel, the front radial bearing flow channel and the air channel of the magnetic bearing in sequence, and then merge with the airflow mixed with the airflow passing through the motor stator flow channel and the motor rotor flow channel at the thrust plate air outlet, and then be discharged through the bearing outlet.

[0049] The magnetic levitation rotating machine provided by the present invention has the following beneficial effects:

[0050] 1. The present invention provides thrust plate ventilation holes and thrust plate air outlet holes on the thrust plate, wherein the thrust plate ventilation holes include a first thrust plate air inlet hole extending from one axial end face of the thrust plate toward the inside of the thrust plate, and a second thrust plate air inlet hole extending from the other axial end face of the thrust plate toward the inside of the thrust plate. The thrust plate ventilation holes can realize self-active air suction and heat exchange through high rotation speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, actively cool the thrust plate 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 the first thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator one, so that the end face of the thrust plate is not punched at the magnetic pole position facing the axial stator one, so that the cooling However, the air cannot directly reach the magnetic pole gap position, which can effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, thereby avoiding the insufficient axial support force of the magnetic suspension, achieving the improvement of heat dissipation and cooling of the magnetic suspension bearing while avoiding the impact on the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension support force, and effectively reducing the impact of the gas force on the axial force; the present invention also preferably arranges the thrust plate ventilation hole between the axial upper and lower magnetic poles directly opposite the coil, and the aperture size is ≤ the radial spacing between the axial upper and lower magnetic poles of the stator, which can make the thrust plate ventilation hole further effectively avoid the magnetic pole position, further avoid the impact on the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, which can also make the airflow resistance at both ends of the thrust plate small and the fluidity good;

[0051] The present invention also arranges a cylinder flow channel on the cylinder, a motor rotor flow channel on the rotor, and a motor stator flow channel on the motor stator, so that the cooling gas at the air inlet enters from the rear shell body and is divided into three paths, one path from the cylinder, the second path from the motor rotor, and the third path from the motor stator. The cooling gas in the cylinder can cool the stator and the magnetic suspension bearing at the outer periphery of the stator and the outer periphery of the magnetic suspension bearing respectively, and mix with the flow from the motor stator flow channel and the motor rotor flow channel at the air outlet of the thrust plate of the magnetic suspension bearing, and then the thrust plate rotates to throw the gas out, thereby further increasing the air flow area, and further improving the cooling and heat dissipation efficiency and cooling and heat dissipation performance of the magnetic suspension machinery.

[0052] 2. The present invention further sets the relationship in any radial cross section of the thrust disk: 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 - the cross-sectional area of ​​the thrust disk air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1, so that the other magnetic path parts on the thrust disk that are different from the magnetic pole position will not appear magnetic field saturation before the magnetic pole position, thereby ensuring the formation of a normal magnetic flux circuit and ensuring the continuous and effective provision of the magnetic suspension support force; the present invention further sets the first thrust disk air inlet hole as an extension from one axial end face to the other axial end face. When the thrust plate is rotated at a high speed, the rotor can generate negative pressure to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, realizing active ventilation and heat exchange of the thrust plate itself, accelerating the gas flow, saving energy, improving the heat dissipation performance and energy efficiency; at the same time, in combination with the ventilation grooves in the axial stator coil slots and the inner ring holes in the axial stator (multiple gas flow paths), the gas flow in the axial stator coil slot cavity can be further accelerated, thereby realizing effective autonomous heat dissipation of the axial coil and the thrust plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a longitudinal sectional stereoscopic view of a magnetic suspension bearing of a magnetic suspension rotating machine of the present invention;

[0054] Figure 2 is a longitudinal sectional front view of the magnetic suspension bearing of the present invention;

[0055] Figure 3 yes Figure 1 A three-dimensional internal structure diagram of the thrust plate structure;

[0056] Figure 4 It is a longitudinal sectional view of the magnetic levitation rotating machine of the present invention.

[0057] The reference numerals are as follows:

[0058] 1. Axial stator 1; 11. Radial outer part 1; 12. Radial inner part 1; 13. Coil slot 1; 14. Axial outer part 1; 2. Axial stator 2; 21. Radial outer part 2; 22. Radial inner part 2; 23. Coil slot 2; 24. Axial outer part 2; 3. Thrust plate; 4. Cover plate 1; 4', cover plate 2; 5. Coil 1; 5', Coil 2; 6. Rotor; 10. Cooling impeller; 110. Guide plate; 12 0, rear end cover; 121, air inlet; 130, rear housing; 140, rear radial bearing; 15, motor stator; 17, front radial bearing; 18, front housing; 19, cylinder; 20, front end cover; 210, impeller air outlet; 220, rear housing flow channel; 230, motor stator flow channel; 240, cylinder flow channel; 250, motor rotor flow channel; 25, front housing channel; 26, bearing air outlet; 27, front housing channel;

[0059] 01, first thrust plate air inlet; 02, second thrust plate air inlet; 03, axial stator inner ring hole one; 03', axial stator inner ring hole two; 04, ventilation groove one; 04', ventilation groove two; 05, thrust plate air outlet. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0063] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0064] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0065] 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. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0066] like Figure 1-4As shown, the present invention provides a magnetic levitation rotating machine, which includes:

[0067] A cylinder 19, a magnetic bearing, a motor stator and a rotor 6, wherein the motor stator is located at the radial outer periphery of a part of the shaft section of the rotor 6, the magnetic bearing, the rotor 6 and the motor stator are all located inside the cylinder 19, a cylinder flow channel 240 is axially opened on the cylinder 19, a motor stator flow channel 230 is axially opened on the motor stator, and a motor rotor flow channel 250 (an air gap between the rotor and the motor stator) is formed in the rotor air gap at the part of the rotor 6 opposite to the motor stator, and the cylinder flow channel 240, the motor stator flow channel 230 and the motor rotor flow channel 250 can all flow gas; the magnetic bearing is located on one side of the axial direction of the motor stator and can support the rotor 6;

[0068] The magnetic bearing comprises 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 is provided 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, and a coil 5 is arranged in the coil slot 13;

[0069] The thrust plate ventilation hole includes a first thrust plate air inlet hole 01 extending from one axial end face of the thrust plate 3 toward the interior of the thrust plate 3, and a second thrust plate air inlet hole 02 extending from the other axial end face of the thrust plate 3 toward the interior of the thrust plate 3. One end of the first thrust plate air inlet hole 01 located inside the thrust plate 3 is connected with one end of the second thrust plate air inlet hole 02 located inside the thrust plate 3, and then connected to the outer periphery of the thrust plate 3 through the thrust plate air outlet hole 05. One end of the first thrust plate air inlet hole 01 located on one axial end face of the thrust plate 3 is opposite to and connected with the position of the coil slot 13 in the axial direction, and the cylinder flow channel 240, the motor stator flow channel 230 and the motor rotor flow channel 250 can all be connected with the thrust plate air outlet hole 05; and the one end of the first thrust plate air inlet hole 01 is not opposite to the magnetic pole position of the axial stator 1.

[0070] The present invention has thrust disk ventilation holes and thrust disk air outlet holes opened on the thrust disk. The thrust disk ventilation holes include a first thrust disk air inlet hole extending from one axial end surface of the thrust disk toward the inside of the thrust disk, and a second thrust disk air inlet hole extending from the other axial end surface of the thrust disk toward the inside of the thrust disk. The thrust disk ventilation holes can realize self-active air suction and heat exchange through high rotation speed, 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, thereby improving the cooling and heat dissipation of the magnetic suspension bearing. The effect is achieved by not making the air inlet of the first thrust plate opposite to the magnetic pole position of the axial stator one, so that the end face of the thrust plate is not punched at the magnetic pole position facing the axial stator one, so that the cooling air cannot directly reach the magnetic pole gap position, and the cooling gas and the opening can be effectively avoided from affecting the magnetic furnace structure, thereby avoiding insufficient axial support force of the magnetic suspension, achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension support force, and effectively reducing the influence of the gas force on the axial force;

[0071] The present invention also arranges a cylinder flow channel on the cylinder, a motor rotor flow channel on the rotor, and a motor stator flow channel on the motor stator, so that the cooling gas at the air inlet enters from the rear shell body and is divided into three paths, one path from the cylinder, the second path from the motor rotor, and the third path from the motor stator. The cooling gas in the cylinder can cool the stator and the magnetic suspension bearing at the outer periphery of the stator and the outer periphery of the magnetic suspension bearing respectively, and mix with the flow from the motor stator flow channel and the motor rotor flow channel at the air outlet of the thrust plate of the magnetic suspension bearing, and then the thrust plate rotates to throw the gas out, thereby further increasing the air flow area, and further improving the cooling and heat dissipation efficiency and cooling and heat dissipation performance of the magnetic suspension machinery.

[0072] In some embodiments,

[0073] It also includes a cover plate 4, the cover plate 4 is located between the axial stator 1 and the thrust plate 3, and an axial end surface of the cover plate 4 is connected to the radial outer side portion 11 of the axial stator 1, and the other axial end surface of the cover plate 4 is opposite to the thrust plate 3;

[0074] The magnetic pole position of the axial stator 1 includes a portion of the cover plate 4 opposite to the thrust plate 3, and a portion of the radial inner portion 12 opposite to the thrust plate 3, a ventilation groove 04 is provided between the cover plate 4 and the radial inner portion 12, the first thrust plate air inlet hole 01 is opposite to the ventilation groove 04 in the axial direction, and a radial dimension of the ventilation groove 04 is greater than or equal to a radial dimension of the first thrust plate air inlet hole 01.

[0075] The present invention also preferably arranges the thrust plate ventilation hole between the axial upper and lower magnetic poles directly opposite the coil, and the hole size is ≤ the radial spacing between the axial upper and lower magnetic poles of the stator, so that the first thrust plate air inlet hole can further effectively avoid the magnetic pole position, further avoiding the influence on the magnetic circuit, and the thrust plate ventilation hole is connected with the ventilation paths at both ends without obstruction, and the airflow resistance at both ends of the thrust plate can be small and the fluidity is good.

[0076] In some embodiments,

[0077] 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 - 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 1.

[0078] The present invention further sets the relationship in any radial cross-section of the thrust plate: the cross-sectional area of ​​the magnetic circuit flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 1 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1, so that other magnetic circuit parts on the thrust plate that are different from the magnetic pole position will not experience magnetic field saturation before the magnetic pole position, thereby ensuring the formation of a normal magnetic flux circuit and ensuring the continuous and effective provision of magnetic suspension supporting force.

[0079] In some embodiments,

[0080] An axial stator inner ring hole 03 is provided on the radial inner side portion 12 at a position opposite to the ventilation groove 04, so that the axial stator inner ring hole 03 is connected with the ventilation groove 04, and further connected to the thrust plate air outlet hole 05 through the first thrust plate air inlet hole 01, and the intake air flow sequentially passes through the axial stator inner ring hole 03, the ventilation groove 04 and the first thrust plate air inlet hole 01 to flow to the thrust plate air outlet hole 05;

[0081] The cylindrical flow channel 240 can be connected to the coil slot 13 through the axial stator inner ring hole 03, and further connected to the thrust plate air outlet hole 05 through the first thrust plate air inlet hole 01.

[0082] The present invention can further accelerate the gas flow in the axial stator coil slot cavity by arranging a ventilation groove and an axial stator inner ring hole (multiple gas flow paths) on the radial inner side, thereby realizing effective autonomous heat dissipation of the axial coil and the thrust plate; and the cylindrical flow channel of the present invention dissipates heat to the outer periphery of the magnetic bearing and to the interior of the magnetic bearing, and can provide a larger flow of gas to the coil slot, thereby further improving the cooling and heat dissipation efficiency of the interior of the magnetic bearing.

[0083] In some embodiments,

[0084] Along the axial direction of the thrust plate 3, the first thrust plate air inlet hole 01 is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate 3, and when observing from one axial end face of the thrust plate 3 toward the other axial end face thereof, the rotation direction of the thrust plate 3 is toward a first rotation direction, and the extension direction of the first thrust plate air inlet hole 01 from one axial end face to the other axial end face is toward a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0085] The present invention also sets the first thrust plate air inlet hole so that the extension direction from one axial end face to the other axial end face is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust plate). When the rotor drives the thrust plate to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, realizing active ventilation and heat exchange of the thrust plate itself, accelerating gas flow, saving energy consumption, improving heat dissipation performance and improving energy efficiency.

[0086] In order to facilitate negative pressure air intake, the air inlet direction of the inner ring is opposite to the rotation direction, the air inlet is 90° in the circumferential direction to the rotation direction, and the air outlet is 90° in the radial direction to the rotation direction. There is no requirement for the hole shape. For the convenience of machining and processing, a circular hole, a rectangular circular hole or an elliptical hole is preferred.

[0087] In some embodiments,

[0088] There are multiple first thrust plate air inlet holes 01, which are arranged at intervals along the circumferential direction of the thrust plate 3, and an extension direction of each of the first thrust plate air inlet holes 01 from one axial end face to the other axial end face is toward the second rotation direction, which is opposite to the first rotation direction of the thrust plate 3.

[0089] The present invention proposes a magnetic levitation rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust plate adopts a Y-shaped inclined hole solution to realize its own active air suction heat exchange through high speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, and cooperate with the overall active pure air cooling of the magnetic levitation rotating machine. The coaxial impeller cooling at the other end of the main impeller or the rotor rotation negative pressure cooling or the main impeller leakage cooling is used to change the previous external passive heat dissipation into internal active heat dissipation, improve the heat dissipation efficiency and reduce the heat dissipation cost. This magnetic levitation rotating machine cooling solution can effectively ventilate and dissipate heat for motor stators, motor rotors, magnetic bearings, etc., and can also better dissipate heat for axial magnetic bearings, thereby improving the stability of the magnetic levitation system.

[0090] In some embodiments,

[0091] The axial stator 2 includes a radial outer portion 21 and a radial inner portion 22, the radial outer portion 21 and the radial inner portion 22 are spaced apart in the radial direction of the axial stator 2, and a coil slot 23 is formed therebetween, a coil 5' is arranged in the coil slot 23, the second thrust plate air inlet hole 02 is located at one end of the other axial end surface of the thrust plate 3 and is opposite to and connected with the position of the coil slot 23 in the axial direction, the motor stator flow channel 230 and the motor rotor flow channel 250 can both be connected with the second thrust plate air inlet hole 02; and the one end of the second thrust plate air inlet hole 02 is not opposite to the magnetic pole position of the axial stator 2.

[0092] The present invention further arranges the air inlet of the second thrust plate at a position that is not opposite to the magnetic pole position of the axial stator 2, so that the end face of the thrust plate is not punched at the magnetic pole position facing the axial stator 2, so that the cooling air cannot directly reach the magnetic pole gap position of the axial stator 2, which can further effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, further avoid the insufficient axial supporting force of the magnetic suspension, further achieve the improvement of heat dissipation cooling of the magnetic suspension bearing, and avoid the influence on the magnetic suspension magnetic circuit, further improve the magnetic suspension supporting force, and effectively reduce the influence of the gas force on the axial force; and the motor stator flow channel and the motor rotor flow channel provide two paths for the heat dissipation gas to circulate, which can provide cooling gas to the motor rotor and the motor stator for heat dissipation respectively, and the cooling and heat dissipation area is wider, further improving the cooling and heat dissipation efficiency of the motor interior.

[0093] In some embodiments,

[0094] It also includes a cover plate 4', the cover plate 4' is located between the axial stator 2 and the thrust plate 3, and one axial end surface of the cover plate 4' is connected to the radial outer side 21 of the axial stator 2, and the other axial end surface of the cover plate 4' is opposite to the thrust plate 3;

[0095] The magnetic pole position of the axial stator 2 includes the portion of the cover plate 2 4' opposite to the thrust plate 3, and the portion of the radial inner portion 22 opposite to the thrust plate 3, a ventilation groove 204' is provided between the cover plate 2 4' and the radial inner portion 22, the second thrust plate air inlet hole 02 is opposite to the ventilation groove 204' in the axial direction, and the radial dimension of the ventilation groove 204' is greater than or equal to the radial dimension of the second thrust plate air inlet hole 02.

[0096] The present invention also preferably arranges the second thrust plate air inlet hole between the upper and lower magnetic poles of the axial stator 2 directly opposite to the coil, and the hole size is ≤ the radial spacing between the upper and lower magnetic poles of the axial stator, so that the second thrust plate air inlet hole can further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, and the airflow resistance at both ends of the thrust plate can be small and the fluidity is good.

[0097] In some embodiments,

[0098] In each radial cross-section of the thrust plate 3, the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 2 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole 05 ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2.

[0099] The present invention further provides a thrust plate ventilation hole between the upper and lower magnetic poles of the axial stator 2, directly opposite to the coil, so that the aperture size of the thrust plate ventilation hole is ≤ the radial spacing between the upper and lower magnetic poles of the axial stator 2, so that the thrust plate ventilation hole can further effectively avoid the magnetic pole position of the axial stator 2, further avoiding the influence on the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, and the airflow resistance at both ends of the thrust plate is small and the fluidity is good.

[0100] In some embodiments,

[0101] An axial stator inner ring hole 203' is provided at a position on the radial inner side portion 22 opposite to the ventilation groove 204', so that the axial stator inner ring hole 203' is connected with the ventilation groove 204', and further connected to the thrust plate air outlet hole 05 through the second thrust plate air inlet hole 02, and the intake air flows through the axial stator inner ring hole 203', the ventilation groove 204' and the second thrust plate air inlet hole 02 in sequence to the thrust plate air outlet hole 05;

[0102] The motor stator flow channel 230 and the motor rotor flow channel 250 can both be connected to the coil slot 23 through the axial stator inner ring hole 2 03 ′, and further connected to the thrust plate air outlet hole 05 through the second thrust plate air inlet hole 02 .

[0103] The present invention can further accelerate the gas flow in the coil slot cavity of the axial stator 2 by providing two ventilation grooves on the radial inner side and two axial stator inner ring holes (multiple gas flow paths), thereby achieving effective autonomous heat dissipation of the axial coil and the thrust plate; and the motor stator flow channel and the motor rotor flow channel of the present invention dissipate heat inside the motor, further improving the cooling and heat dissipation efficiency of the inside of the motor.

[0104] In some embodiments,

[0105] Along the axial direction of the thrust plate 3, the second thrust plate air inlet hole 02 is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate 3, and when observing from the other axial end face of the thrust plate 3 toward one axial end face thereof, the rotation direction of the thrust plate 3 is toward the third rotation direction, and the extension direction of the second thrust plate air inlet hole 02 from the other axial end face to the one axial end face is toward the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0106] The present invention also sets the second thrust plate air inlet hole so that the extension direction from the other axial end face to the one axial end face is toward the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction (the rotation direction of the thrust plate), so that the rotor can drive the thrust plate to rotate at a high speed to generate negative pressure to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, realizing active ventilation and heat exchange of the thrust plate itself, accelerating gas flow, saving energy consumption, improving heat dissipation performance and improving energy efficiency;

[0107] Along the direction from one axial end face to the other axial end face, the first rotation direction is the third rotation direction, and the fourth rotation direction is the same as the second rotation direction. The first and second thrust plate air inlet holes and the thrust plate air outlet holes together form a Y-shaped inclined hole, and air is taken in from both sides toward the middle and discharged through the thrust plate air outlet holes.

[0108] To facilitate negative pressure air intake, the direction of the air inlet from the inner ring is opposite to the direction of rotation, the air inlet is >90° from the direction of rotation in the circumferential direction, and the air outlet is ≥90° from the direction of rotation in the radial direction. There is no requirement for the hole shape. For the convenience of machining and processing, circular holes, rectangular holes or elliptical holes are preferred.

[0109] In some embodiments,

[0110] There are multiple second thrust plate air inlet holes 02, and the multiple second thrust plate air inlet holes 02 are arranged at intervals along the circumferential direction of the thrust plate 3, and the extension direction of each second thrust plate air inlet hole 02 from the other axial end face to the one axial end face is toward the fourth rotation direction, which is opposite to the third rotation direction of the thrust plate 3.

[0111] In some embodiments,

[0112] The first thrust plate air inlet hole 01, the thrust plate air outlet hole 05 and the second thrust plate air inlet hole 02 correspond to each other one by one, forming a group of air outlet units. There are multiple groups of air outlet units, and the multiple groups of air outlet units are arranged at intervals along the circumferential direction of the thrust plate 3.

[0113] The present invention can increase the air flow area and flow rate in the circumferential direction by disposing a plurality of air outlet units, thereby further improving the cooling and heat dissipation effect on the magnetic suspension bearing.

[0114] In some embodiments,

[0115] The thrust plate 3 has a minimum axial width of N for the magnetic circuit flow area when the magnetic saturation is met, and the axial aperture of the thrust plate air outlet 05 = the axial thickness of the thrust plate 3 - N. The thrust plate of the present invention preferably has a minimum axial width of N for the magnetic circuit flow area when the magnetic saturation is met, and the axial aperture of the air outlet = the thickness of the thrust plate - N, which can effectively ensure the maximum heat dissipation channel without affecting the conduction of the axial magnetic circuit.

[0116] In some embodiments,

[0117] A bearing air outlet 26 is also provided at a position of the cylinder 19 opposite to the thrust plate air outlet hole 05 of the thrust plate 3 , which can be used to connect with the thrust plate air outlet hole 05 and exhaust air outward.

[0118] The present invention provides a bearing air outlet on the outermost cylinder, which is opposite to the thrust plate air outlet and can guide the gas discharged from the thrust plate air outlet hole, so that the gas entering from the first and second thrust plate air inlet holes on both sides respectively is discharged from the stator outer ring hole after cooling the coil, rotor and other structures of the magnetic levitation bearing, thereby ensuring the smoothness of gas flow and improving the cooling effect.

[0119] The axial magnetic bearing of the present invention preferably adopts active ventilation cooling. Several Y-shaped inclined holes are opened in the circumference of the thrust plate. Inclined holes are drilled on both sides between the two magnetic poles of the thrust plate to merge in the middle, and then inclined holes are drilled upward to the outer ring surface of the thrust plate. The inner ring surface of the axial stator has a through hole that cooperates with the Y-shaped hole air inlet of the thrust plate. The air inlet direction of the thrust plate inclined hole is opposite to the rotation direction of the rotor. When the thrust plate is driven by the rotor to rotate at a high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate introduced, realizing active ventilation and heat exchange of the thrust plate itself, and at the same time cooperating with the inner ring hole of the axial stator to accelerate the gas flow in the axial stator cavity, thereby realizing effective autonomous heat dissipation of the axial magnetic bearing.

[0120] According to the principle of axial magnetic suspension bearing, the relative position between the thrust plate and the axial magnetic pole is the output position, that is, the thrust plate end face facing the magnetic pole position cannot be punched to avoid insufficient axial force, and 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 flow, in order to ensure that the magnetic field saturation does not occur in other positions before the magnetic pole position, in the radial circumferential direction, the cross-sectional area of ​​the magnetic circuit flow position ≥ the cross-sectional area of ​​the magnetic pole position. If the thrust plate opening position is opened within the magnetic circuit, in any radial cross section, the cross-sectional area of ​​the magnetic circuit flow position = the radial circumferential cross-sectional area of ​​the thrust plate and the bearing stator relative part - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate outlet hole ≥ the cross-sectional area of ​​the magnetic pole position, preferably located between the upper and lower axial magnetic poles directly opposite the coil, the aperture size ≤ the radial spacing between the upper and lower magnetic poles of the axial stator, connected with the ventilation path at both ends without obstruction, the airflow resistance at both ends of the thrust plate is small, and the flowability is good.

[0121] The heat dissipation of the entire system preferably adopts an active pure air-cooled heat dissipation system. The cold air is driven by the coaxial impeller at the other end of the main impeller or the rotor rotates to intake centrifugal air or the main impeller leaks air. No additional heat dissipation drive motor is required. The heat dissipation cold air flow is adjusted by the motor speed. No additional controller is required. 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 the heat dissipation process is efficient and reliable.

[0122] In some embodiments,

[0123] It also includes a rear end cover 120, a cooling impeller 10, a rear housing 130, a barrel 19 and a rear radial bearing 140. The cooling impeller 10 is arranged at one axial end of the rotor 6 so as to rotate integrally with the rotor 6. The cooling impeller 10 is arranged inside the rear end cover 120. An axially penetrating air inlet 121 is arranged at the central axis position of the rear end cover 120. The air inlet 121 is directly opposite to the cooling impeller 10. The magnetic bearing and the motor stator are both located inside the barrel 19.

[0124] The rear housing 130 is axially connected between the rear end cover 120 and the barrel 19, and a rear housing flow channel 220 is axially arranged on the rear housing 130, one end of the rear housing flow channel 220 can be communicated with the barrel flow channel 240, the motor stator flow channel 230 and the motor rotor flow channel 250 respectively, and the other end of the rear housing flow channel 220 can be communicated with the impeller air outlet 210 of the cooling impeller 10;

[0125] The airflow can enter the barrel flow channel 240, the motor stator flow channel 230 and the motor rotor flow channel 250 respectively through the air inlet 121, the cooling impeller 10, the interior of the rear end cover 120 and the rear casing flow channel 220 in sequence.

[0126] This is the structure of the magnetic levitation rotating machinery of the present invention located on the axial side of the magnetic levitation bearing, including the rear end cover for air intake, the rear housing, the rear radial bearing and the cooling impeller structure. The cooling impeller can suck gas from the air inlet into the interior of the rear end cover as the rotor rotates as a whole, and supply it to the cylinder flow channel, the motor stator flow channel and the motor rotor flow channel respectively through the rear housing flow channel, thereby improving the air flow path, increasing the heat dissipation area of ​​the cylinder and the stator and rotor parts, and improving the cooling and heat dissipation performance.

[0127] In some embodiments,

[0128] It also includes a front radial bearing 17, a front housing 18 and a front end cover 20, wherein the front radial bearing 17 and the front housing 18 are both located on the axial side of the magnetic bearing away from the motor stator, a front radial bearing flow channel is provided between the front radial bearing 17 and the outer periphery of the rotor 6, a front housing flow channel is provided between the front housing 18 and the outer periphery of the rotor 6, the front end cover 20 is provided on the axial side of the cylinder 19 away from the rear end cover 120, and a storage space is formed between the front end cover 20 and the front housing 18, a front housing channel 27 is axially penetrated on the front housing 18, one end of the front housing channel 27 is opposite to and communicated with the storage space, and the other end is opposite to and communicated with the cylinder flow channel 240;

[0129] The airflow is allowed to pass through the cylinder flow channel 240, the front shell channel 27, the accommodating space, the front shell flow channel, the front radial bearing flow channel and the air channel of the magnetic bearing in sequence, and then merge with the airflow mixed with the airflow passing through the motor stator flow channel 230 and the motor rotor flow channel 250 at the thrust plate air outlet 05, and then be discharged through the bearing air outlet 26.

[0130] This is the structure of the magnetic levitation rotating machinery of the present invention located on the other axial side of the magnetic levitation bearing, including the front end cover of the air intake, the front housing, the front radial bearing, etc., which can introduce the gas after cooling the stator and the magnetic levitation bearing through the cylinder flow channel into the interior of the magnetic levitation bearing through the front housing and the front radial bearing to exchange heat with the magnetic levitation bearing, and after heat exchange, mix with the gas after heat exchange through the motor stator and rotor flow channels at the thrust plate, further enhancing the heat exchange effect on the inside of the magnetic levitation bearing stator (especially the coil part), and discharge them together to the outside of the cylinder through the outlet, thereby improving the cooling and heat dissipation performance.

[0131] Figure 4The figure shows the cooling flow path scheme (preferably a blower, etc.) of the magnetic suspension rotating machinery of the present invention, which adopts an active pure air-cooling heat dissipation system. The cold air is provided by the cooling impeller, and no additional heat dissipation drive motor is required. The cooling impeller 10 is installed at the rear end of the rotor, and the rear radial bearing 140 is located between the cooling impeller 10 and the motor stator 15. The front end is placed on the front radial bearing 17, and the magnetic suspension axial bearing is located between the front radial bearing 17 and the motor stator 15. The rear housing is equipped with a guide plate 110 and a rear end cover 120 for cooling the impeller to guide the flow, which increases the air flow conduction and reduces the flow resistance. In addition, the rear housing 130, the cylinder 19, the front housing 18, the magnetic suspension axial bearing and other parts are provided with a number of corresponding ventilation holes or ventilation slots for air flow conduction. The impeller outlet 2 The cooling gas of 10 is divided into three cooling paths through the rear shell flow channel 220 on the rear shell 130. The first path: through the cylinder flow channel 240 → the front shell channel 27 → the front radial bearing 17 and then through the axial stator inner ring hole 03, the ventilation groove 04 and the thrust plate Y-type inclined hole at the axial magnetic bearing to cool the axial bearing and the thrust plate 3, and the bearing outlet 26 is discharged from the cylinder 19; the second path: through the motor stator flow channel 230 to cool the motor stator 15; the third path: first cool the rear radial bearing 140 and then through the motor rotor flow channel 250 to cool the rotor 6 and the motor stator 15, and gather with the second path gas at the bearing stator inner ring hole 203' and the thrust plate Y-type inclined hole to cool the axial bearing and the thrust plate 3, and the bearing outlet 26 is discharged from the cylinder 19. This flow channel structure arrangement can effectively cool the heat-generating components such as the motor stator, rotor, radial bearing, axial bearing, etc. At the same time, a Y-shaped inclined hole is provided on the thrust plate of the high-heat-generating component to use negative pressure to suck out the hot air through the Y-shaped inclined hole flow channel, thereby achieving effective ventilation and cooling of the overall heat-generating components of the blower. The entire heat dissipation system has a simple structure, the heat dissipation process is efficient and reliable, and the stability of the magnetic levitation system is improved.

[0132] The beneficial effects of the present invention are as follows:

[0133] 1. The present invention sets a Y-shaped inclined hole on the thrust plate for high-heat generating components, uses negative pressure to absorb heat through the Y-shaped inclined hole flow channel, and drills inclined holes on both sides between the two magnetic poles of the thrust plate to merge in the middle, and then drills inclined holes upward to the outer ring surface of the thrust plate. The through hole on the inner ring surface of the axial stator cooperates with the Y-shaped hole air inlet of the thrust plate, which can actively cool and accelerate the heat dissipation of itself, increase the cooling flow rate and do not affect the axial magnetic circuit;

[0134] 2. The present invention 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 heat-generating components can effectively accelerate cooling and improve reliability. It 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 heat dissipation system has high reliability.

[0135] The present invention also provides a magnetic suspension rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator or a compressor), which includes the aforementioned magnetic suspension bearing.

[0136] Figure 1 The figure shows the internal axial bearing cooling path of the magnetic levitation rotating machine (preferably a blower) of the present invention. The three inclined holes of the first thrust plate air inlet hole 01 (inclined hole), the second thrust plate air inlet hole 02 (inclined hole), and the thrust plate air outlet hole 05 (inclined hole) form a thrust plate Y-shaped inclined hole. The axial stator inner ring hole 03 and the ventilation groove 04 cooperate with the thrust plate Y-shaped hole air inlet. This cooling path is: the cooling gas passes through the axial stator inner ring hole 03 (axial stator inner ring hole 2 03') → ventilation groove 1 04 (ventilation groove 2 04'), and is collected from the first thrust plate air inlet hole 01 and the second thrust plate air inlet hole 02 on both sides of the thrust plate to the thrust plate air outlet hole 05 for discharge, effectively dissipating the heat of the axial stator and the axial winding. During operation, the air intake direction of the first and thrust plate air inlet inclined holes is opposite to the rotation direction of the rotor. The gas in the ventilation groove is sucked into the thrust plate inclined hole by negative pressure and then discharged for heat dissipation. This cooling path achieves an effective autonomous heat dissipation effect. In order to make the thrust plate intake negative pressure air, the intake direction must always be opposite to the rotor rotation direction. Therefore, the rotation direction of the thrust plate inclined hole is related to the thrust plate intake direction and the rotor rotation direction. If the rotation direction of the intake rotor at the left end of the thrust plate is clockwise when viewed from the right end, the thrust plate is a right-handed inclined hole. If the rotation direction of the intake rotor at the left end of the thrust plate is counterclockwise when viewed from the right end, it is a left-handed inclined hole. Similarly, if the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0137] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A magnetically suspended rotating machine, characterized in that: include: A cylinder (19), a magnetic bearing, a motor stator and a rotor (6), wherein the motor stator is located on the radial outer periphery of a part of the shaft section of the rotor (6), the magnetic bearing, the rotor (6) and the motor stator are all located inside the cylinder (19), a cylinder flow channel (240) is axially opened on the cylinder (19), a motor stator flow channel (230) is axially opened on the motor stator, a motor rotor flow channel (250) is formed in the rotor air gap at a portion of the rotor (6) opposite to the motor stator, and gas can flow through the cylinder flow channel (240), the motor stator flow channel (230) and the motor rotor flow channel (250); the magnetic bearing is located on one side of the axial direction of the motor stator and can support the rotor (6); The magnetic bearing comprises an axial stator 1 (1), an axial stator 2 (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 (1) and the axial stator 2 (2); a thrust plate ventilation hole is arranged on the thrust plate (3) from one axial end surface to the other axial end surface; the axial stator 1 (1) comprises a radial outer portion 1 (11) and a radial inner portion 1 (12); the radial outer portion 1 (11) and the radial inner portion 1 (12) are arranged in a radial direction of the axial stator 1 (1) at intervals, and a coil slot 1 (13) is formed between the two, and a coil 1 (5) is arranged in the coil slot 1 (13); The thrust plate ventilation hole comprises a first thrust plate air inlet hole (01) extending from one axial end surface of the thrust plate (3) toward the interior of the thrust plate (3), and a second thrust plate air inlet hole (02) extending from the other axial end surface of the thrust plate (3) toward the interior of the thrust plate (3); one end of the first thrust plate air inlet hole (01) located inside the thrust plate (3) is connected with one end of the second thrust plate air inlet hole (02) located inside the thrust plate (3), and after being connected, the air is passed through the thrust plate air outlet hole (05) is connected to the outer periphery of the thrust plate (3), the first thrust plate air inlet hole (01) is located at one end of an axial end surface of the thrust plate (3) and is opposite to and connected to the position of the coil slot 1 (13) in the axial direction, the cylinder flow channel (240), the motor stator flow channel (230) and the motor rotor flow channel (250) can all be connected to the thrust plate air outlet hole (05); and the one end of the first thrust plate air inlet hole (01) is not opposite to the magnetic pole position of the axial stator 1 (1).

2. The magnetic levitation rotating machine according to claim 1, characterized in that: It also includes a cover plate (4), the cover plate (4) being located between the axial stator (1) and the thrust plate (3), and an axial end surface of the cover plate (4) being connected to the radial outer side portion (11) of the axial stator (1), and the other axial end surface of the cover plate (4) being opposite to the thrust plate (3); The magnetic pole position of the axial stator (1) includes a portion of the cover plate (4) opposite to the thrust disk (3) and a portion of the radial inner portion (12) opposite to the thrust disk (3); a ventilation groove (04) is provided between the cover plate (4) and the radial inner portion (12); the first thrust disk air inlet hole (01) is opposite to the ventilation groove (04) in the axial direction, and a radial dimension of the ventilation groove (04) is greater than or equal to a radial dimension of the first thrust disk air inlet hole (01).

3. The magnetic levitation rotating machine 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 one (1) = the radial cross-sectional area of ​​the thrust disk and the corresponding part of 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 levitation rotating machine according to claim 2, characterized in that: An axial stator inner ring hole (03) is provided on the radial inner side portion (12) at a position opposite to the ventilation groove (04), so that the axial stator inner ring hole (03) is connected to the ventilation groove (04), and further connected to the thrust plate air outlet (05) through the first thrust plate air inlet hole (01), and the intake air flows through the axial stator inner ring hole (03), the ventilation groove (04) and the first thrust plate air inlet hole (01) in sequence to the thrust plate air outlet (05); The cylindrical flow channel (240) can be connected to the coil slot one (13) through the axial stator inner ring hole one (03), and further connected to the thrust plate air outlet hole (05) through the first thrust plate air inlet hole (01).

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

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

7. The magnetic levitation rotating machine 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), and the second thrust plate air inlet hole (02) is located at one end of the other axial end surface of the thrust plate (3) and is opposite to and connected to the position of the coil slot 2 (23) in the axial direction, and the motor stator flow channel (230) and the motor rotor flow channel (250) can both be connected to the second thrust plate air inlet hole (02); and the one end of the second thrust plate air inlet hole (02) is not opposite to the magnetic pole position of the axial stator 2 (2).

8. The magnetic levitation rotating machine according to claim 7, characterized in that: It also includes a second cover plate (4'), the second cover plate (4') is located between the second axial stator (2) and the thrust plate (3), and one axial end surface of the second cover 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 cover plate (4') is opposite to the thrust plate (3); The magnetic pole position of the axial stator 2 (2) includes a portion of the cover 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 ventilation groove 2 (04') is provided between the cover plate 2 (4') and the radial inner portion 2 (22); the second thrust plate air inlet hole (02) and the ventilation groove 2 (04') are opposite to each other in the axial direction, and a radial dimension of the ventilation groove 2 (04') is greater than or equal to a radial dimension of the second thrust plate air inlet hole (02).

9. The magnetic levitation rotating machine 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 - 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 2 (2).

10. The magnetic levitation rotating machine according to claim 8, characterized in that: An axial stator inner ring hole 2 (03') is provided at a position on the radial inner side portion 2 (22) opposite to the ventilation groove 2 (04'), so that the axial stator inner ring hole 2 (03') is connected to the ventilation groove 2 (04'), and further connected to the thrust plate air outlet hole (05) through the second thrust plate air inlet hole (02), and the intake air flows through the axial stator inner ring hole 2 (03'), the ventilation groove 2 (04') and the second thrust plate air inlet hole (02) in sequence to the thrust plate air outlet hole (05); The motor stator flow channel (230) and the motor rotor flow channel (250) can both be connected to the coil slot 2 (23) through the axial stator inner ring hole 2 (03'), and further connected to the thrust plate air outlet hole (05) through the second thrust plate air inlet hole (02).

11. The magnetic levitation rotating machine according to claim 1, characterized in that: Along the axial direction of the thrust plate (3), the second thrust plate air inlet hole (02) is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate (3); when observing from the other axial end face of the thrust plate (3) toward one axial end face thereof, the rotation direction of the thrust plate (3) is toward a third rotation direction; the extension direction of the second thrust plate air inlet hole (02) from the other axial end face to the one axial end face is toward a fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

12. The magnetic levitation rotating machine according to claim 11, characterized in that: There are a plurality of second thrust plate air inlet holes (02), which are arranged at intervals along the circumferential direction of the thrust plate (3), and an extension direction of each second thrust plate air inlet hole (02) from the other axial end face to the one axial end face is toward a fourth rotation direction, which is opposite to the third rotation direction of the thrust plate (3).

13. The magnetic levitation rotating machine according to claim 12, characterized in that: The first thrust plate air inlet hole (01), the thrust plate air outlet hole (05) and the second thrust plate air inlet hole (02) correspond to each other one by one, forming a group of air outlet units. The air outlet units are multiple groups, and the multiple groups of air outlet units are arranged at intervals along the circumferential direction of the thrust plate (3).

14. The magnetic levitation rotating machine according to any one of claims 1 to 13, characterized in that: The thrust disk (3) has a minimum axial width of a magnetic path flow area of ​​N when magnetic saturation is achieved, and the axial aperture of the thrust disk air outlet hole (05) is equal to the axial thickness of the thrust disk (3) - N.

15. The magnetic levitation rotating machine according to any one of claims 1 to 14, characterized in that: A bearing air outlet (26) is also provided at a position of the cylinder (19) opposite to the thrust plate air outlet (05) of the thrust plate (3), which can be used to connect with the thrust plate air outlet (05) and exhaust air outwards.

16. The magnetic levitation rotating machine according to claim 15, characterized in that: It also includes a rear end cover (120), a cooling impeller (10), a rear casing (130), a barrel (19) and a rear radial bearing (140), wherein the cooling impeller (10) is arranged at one axial end of the rotor (6) so as to rotate integrally with the rotor (6), the cooling impeller (10) is arranged inside the rear end cover (120), an axially penetrating air inlet (121) is arranged at a central axis position of the rear end cover (120), the air inlet (121) is directly opposite to the cooling impeller (10), and the magnetic suspension bearing and the motor stator are both located inside the barrel (19); The rear housing (130) is axially connected between the rear end cover (120) and the barrel (19), and a rear housing flow channel (220) is axially arranged on the rear housing (130), one end of the rear housing flow channel (220) can be respectively communicated with the barrel flow channel (240), the motor stator flow channel (230) and the motor rotor flow channel (250), and the other end of the rear housing flow channel (220) can be communicated with the impeller air outlet (210) of the cooling impeller (10); The airflow can sequentially pass through the air inlet (121), the cooling impeller (10), the interior of the rear end cover (120) and the rear casing flow channel (220) to enter the barrel flow channel (240), the motor stator flow channel (230) and the motor rotor flow channel (250) respectively.

17. The magnetic levitation rotating machine according to claim 16, characterized in that: It also includes a front radial bearing (17), a front housing (18) and a front end cover (20), wherein the front radial bearing (17) and the front housing (18) are both located on the axial side of the magnetic bearing away from the stator of the motor, a front radial bearing flow channel is provided between the front radial bearing (17) and the outer periphery of the rotor (6), a front housing flow channel is provided between the front housing (18) and the outer periphery of the rotor (6), the front end cover (20) is provided on the axial side of the barrel (19) away from the rear end cover (120), and a storage space is formed between the front end cover (20) and the front housing (18), a front housing channel (27) is provided on the front housing (18) in an axially extending manner, one end of the front housing channel (27) is opposite to and connected with the storage space, and the other end is opposite to and connected with the barrel flow channel (240); The airflow is allowed to pass through the cylinder flow channel (240), the front shell channel (27), the accommodating space, the front shell flow channel, the front radial bearing flow channel and the air channel of the magnetic bearing in sequence, and then merge with the airflow mixed with the airflow passing through the motor stator flow channel (230) and the motor rotor flow channel (250) at the thrust plate air outlet (05), and then be discharged through the bearing air outlet (26).

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