A magnetic levitation rotating machine

Abstract

The present invention provides a magnetic levitation rotating machine, comprising a cylinder, a magnetic levitation bearing, a motor stator, and a rotor. Flow channels are respectively provided on the cylinder, the rotor, and the stator. In the axial direction, a thrust disc is arranged between axial stator 1 and axial stator 2. A thrust disc ventilation hole is provided on the thrust disc from its axial end face to its other axial end face. 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 spaced apart in the radial direction of the axial stator 1, and a coil slot 1 is formed therebetween. A coil 1 is provided in the coil slot 1. A first thrust disc air inlet hole is located at one end of the axial end face of the thrust disc opposite to the position of the coil slot 1 in the axial direction. One end of the first thrust disc air inlet hole is not opposite to the magnetic pole position of the axial stator 1. According to the present invention, while improving the heat dissipation and cooling of the magnetic levitation bearing, it can also avoid affecting the magnetic levitation magnetic circuit, thereby ensuring sufficient magnetic levitation support force.

Description

Technical Field

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

[0002] Currently, heat dissipation for magnetically levitated rotating machinery primarily relies on external cooling equipment, typically external cooling fans, water cooling systems, and heat exchangers. This results in high maintenance costs, complex structural systems, and increased safety risks. Alternatively, heat is drawn out of the magnetically levitated rotating machinery using negative pressure, which ineffectively dissipates heat from internal components. This is particularly problematic for the axial magnetic bearings, impacting the stable operation of the magnetically levitated air compressor.

[0003] Axial magnetic bearings achieve axial movement of the rotating shaft, and an axial force-bearing component, the thrust plate, is essential on the shaft. However, the axial magnetic bearing and thrust plate are made of solid pure iron, which has relatively high losses and poor thermal conductivity. Without effective cooling, they will generate severe heat. To prevent excessive temperature rise in the axial magnetic bearing, forced air cooling is often applied externally to dissipate heat. The cooling air is input from the outside and passes through the gap between the bearing stator and the thrust plate to dissipate heat from the axial magnetic bearing. However, the heat dissipation efficiency is not high.

[0004] Since the magnetic suspension bearings inside the rotating machinery in the prior art have technical problems such as poor cooling and heat dissipation effects, the present invention studies and designs a magnetic suspension rotating machinery. 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 on the radial outer periphery of a portion of the rotor shaft segment, 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 through the motor stator, a portion of the rotor opposite to the motor stator forms a motor rotor flow channel in the rotor air gap, 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 axial side of the motor stator 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. A thrust plate ventilation hole is provided on the thrust plate from its axial end face to its other axial end face. 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 spaced apart in the radial direction of the axial stator 1, and a coil slot 1 is formed therebetween. A coil 1 is provided in the coil slot 1.

[0009] The thrust plate ventilation hole includes 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, it is connected to the outer periphery of the thrust plate through the thrust plate air outlet hole, and the end of the first thrust plate air inlet hole located on one axial end face of the thrust plate is opposite to and connected to the position of the coil slot 1 in the axial direction, and the cylindrical flow channel, the motor stator flow channel and the motor rotor flow channel can all be connected to 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] 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 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 disk, and a portion of the radial inner portion 1 opposite to the thrust disk, a ventilation groove 1 is provided between the cover plate 1 and the radial inner portion 1, the first thrust disk 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 disk 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 relative portion of the thrust plate and 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 on the radial inner side portion 1 at a position 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 flows through the axial stator inner ring hole 1, the ventilation groove 1 and the first thrust plate air inlet hole in sequence to the thrust plate air outlet hole;

[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. When observing from one axial end face of the thrust plate toward the other axial end face thereof, the rotation direction of the thrust plate is toward the 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 the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0020] In some embodiments,

[0021] There are multiple air inlet holes in the first thrust plate, and the multiple air inlet holes in the first thrust plate are arranged at intervals along the circumferential direction of the thrust plate. The extension direction of each air inlet hole in the first thrust plate 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.

[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, and the second thrust plate air inlet hole is located at one end of the other axial end face of the thrust plate and is opposite to and connected to 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 to 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] 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 in contact with 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 second axial stator includes the part of the second cover plate opposite to the thrust plate, and the part of the second radial inner part opposite to the thrust plate. A second ventilation groove is provided between the second cover plate and the second radial inner part. The second thrust plate air inlet is opposite to the second ventilation groove in the axial direction, and the radial dimension of the second ventilation groove is greater than or equal to the radial dimension of the second thrust plate air inlet.

[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 opposing portion of the thrust plate and the axial stator 2 - the cross-sectional area of ​​the thrust plate ventilation holes - the cross-sectional area of ​​the thrust plate air outlet holes ≥ 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 on the second radial inner side portion at a position 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 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. 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. 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 in the second thrust plate, and the multiple air inlet holes in the second thrust plate are arranged at intervals along the circumferential direction of the thrust plate, and the extension direction of each of the air inlet holes in 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, 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.

[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 thrust plate air outlet is calculated as follows: the axial thickness of the thrust plate - N.

[0040] In some embodiments,

[0041] A bearing air outlet is further provided at a position of the cylinder 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] The motor further comprises a rear end cover, a cooling impeller, a rear casing, 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 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 provided 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 air flow can sequentially pass through the air inlet, the cooling impeller, the interior of the rear end cover and the rear casing flow channel and enter the barrel flow channel, the motor stator flow channel and the motor rotor flow channel respectively.

[0046] In some embodiments,

[0047] It also includes a front radial bearing, a front housing and a front end cover, the front radial bearing and the front housing 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 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 an accommodating space is formed between the front end cover and the front housing, a front housing channel is provided on the front housing along the axial direction, one end of the front housing channel is opposite to and communicated with the accommodating space, and the other end is opposite to and communicated 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 air outlet.

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

[0050] 1. The present invention provides a thrust plate ventilation hole and a thrust plate air outlet hole on the thrust plate, wherein the thrust plate ventilation hole includes 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, which can realize its own active air suction 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 thrust plate end face is not punched at the position facing the magnetic pole position of the axial stator one, so that the cooling However, the air cannot directly reach the position of the magnetic pole gap, which can effectively avoid the cooling gas and the opening 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; 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 affecting 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 provides 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 air inlet cooling gas entering from the rear shell is divided into three paths, one from the cylinder, the second from the motor rotor, and the third from the motor stator. The cooling gas in the cylinder can cool the stator and the magnetic levitation bearing at the outer periphery of the stator and the outer periphery of the magnetic levitation bearing respectively, and is mixed 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 levitation bearing. The gas is then thrown out by the rotation of the thrust plate, 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 levitation 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 circuit 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 circuit parts on the thrust disk 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 the continuous and effective provision of magnetic levitation supporting 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 disk is rotated at a high speed, negative pressure is generated, and the hot air at one end is sucked out and discharged to the outside, thereby increasing the gas flow rate, realizing active ventilation and heat exchange of the thrust disk itself, accelerating gas flow, saving energy, improving heat dissipation performance and energy efficiency; at the same time, combined with the ventilation grooves in the axial stator coil slots and the axial stator inner ring holes (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 disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a longitudinal sectional perspective 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 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 indicate:

[0058] 1. Axial stator 1; 11. Radially outer portion 1; 12. Radially inner portion 1; 13. Coil slot 1; 14. Axial outer portion 1; 2. Axial stator 2; 21. Radially outer portion 2; 22. Radially inner portion 2; 23. Coil slot 2; 24. Axial outer portion 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 1; 03', Axial stator inner ring hole 2; 04. Ventilation groove 1; 04', Ventilation groove 2; 05. Thrust plate air outlet. DETAILED DESCRIPTION

[0060] The following will be combined with the accompanying 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 embodiments described 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 in no way 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 making creative efforts 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, they indicate 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, the numerical expressions and the numerical values ​​set forth in these embodiments 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 drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0063] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying 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 device or element 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 outline 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 herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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. Unless 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] The cylinder 19, the magnetic bearing, the motor stator and the rotor 6, wherein the motor stator is located on the radial outer periphery of a portion of the shaft segment of the rotor 6, the magnetic bearing, the rotor 6 and the motor stator are all located inside the cylinder 19, the cylinder 19 is provided with a cylinder flow channel 240 along the axial direction, the motor stator is provided with a motor stator flow channel 230 extending axially therethrough, the portion of the rotor 6 opposite to the motor stator is in the rotor air gap to form a motor rotor flow channel 250 (the air gap between the rotor and the motor stator), the cylinder flow channel 240, the motor stator flow channel 230 and the motor rotor flow channel 250 can all circulate gas; the magnetic bearing is located on one axial side of the motor stator and can support the rotor 6;

[0068] The magnetic bearing includes 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 surface to the other axial end surface. The axial stator 1 includes a radial outer portion 11 and a radial inner portion 12. The radial outer portion 11 and the radial inner portion 12 are spaced apart in the radial direction of the axial stator 1, and a coil slot 13 is formed therebetween. The coil slot 13 is provided with a coil 5.

[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 after being connected, it is connected to the outer periphery of the thrust plate 3 through the thrust plate air outlet hole 05, and the 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 cylindrical 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 disc ventilation holes and thrust disc air outlet holes opened on the thrust disc. The thrust disc ventilation holes include a first thrust disc air inlet hole extending from one axial end surface of the thrust disc toward the interior of the thrust disc, and a second thrust disc air inlet hole extending from the other axial end surface of the thrust disc toward the interior of the thrust disc. The thrust disc ventilation holes can realize self-active air suction and heat exchange through high rotation speed, increase the flow rate of gas introduced, accelerate the cooling of the axial magnetic bearing, actively cool the thrust disc 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, which can effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, thereby avoiding insufficient axial supporting 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 supporting force, and effectively reducing the influence of the gas force on the axial force;

[0071] The present invention also provides 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 air inlet cooling gas entering from the rear shell is divided into three paths, one from the cylinder, the second from the motor rotor, and the third from the motor stator. The cooling gas in the cylinder can cool the stator and the magnetic levitation bearing at the outer periphery of the stator and the outer periphery of the magnetic levitation bearing respectively, and is mixed 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 levitation bearing. The gas is then thrown out by the rotation of the thrust plate, 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 levitation machinery.

[0072] In some embodiments,

[0073] The cover plate 14 is located between the axial stator 1 and the thrust plate 3, and one axial end surface of the cover plate 14 is connected to the radial outer portion 11 of the axial stator 1, and the other axial end surface of the cover plate 14 is opposite to the thrust plate 3.

[0074] The magnetic pole position of the axial stator 1 includes the portion of the cover plate 4 opposite to the thrust plate 3, and the 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 the radial dimension of the ventilation groove 04 is greater than or equal to the 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 aperture 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 impact on the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, and can also make the airflow resistance at both ends of the thrust plate small and the fluidity 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 relative part of the thrust disk and 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 within any radial cross-section of the thrust disk: the cross-sectional area of ​​the magnetic circuit 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 other magnetic circuit parts on the thrust disk 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 the continuous and effective provision of magnetic levitation supporting force.

[0079] In some embodiments,

[0080] An axial stator inner ring hole 103 is provided on the radial inner side portion 12 at a position opposite to the ventilation groove 104, so that the axial stator inner ring hole 103 is connected to the ventilation groove 104, and further connected to the thrust plate air outlet hole 105 through the first thrust plate air inlet hole 101, and the intake air flows through the axial stator inner ring hole 103, the ventilation groove 104 and the first thrust plate air inlet hole 101 in sequence to flow to the thrust plate air outlet hole 105;

[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 further accelerates the gas flow in the axial stator coil slot cavity by providing a ventilation groove and an axial stator inner ring hole (multiple gas flow paths) on the radial inner side, thereby achieving 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 levitation bearing, and to the interior of the magnetic levitation bearing, can provide the coil slot with a larger flow of gas, further improving the cooling and heat dissipation efficiency of the interior of the magnetic levitation 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. 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 the 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 the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0085] The present invention also sets the air inlet hole of the first thrust plate 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 entering, 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] To facilitate negative pressure air intake, the air inlet through the inner ring is oriented in the opposite direction of rotation. The air inlet is circumferentially at an angle greater than 90° to the rotational direction, and the air outlet is radially at an angle greater than 90° to the rotational direction. There are no specific requirements for the hole shape; for ease of machining and processing, circular, rectangular, or elliptical holes are preferred.

[0087] In some embodiments,

[0088] There are multiple first thrust plate air inlet holes 01, and the multiple first thrust plate air inlet holes 01 are arranged at intervals along the circumferential direction of the thrust plate 3, and the extension direction of each first thrust plate air inlet hole 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 scheme to achieve its own active suction heat exchange through high rotation speed, increase the gas flow rate, accelerate the cooling of the axial magnetic bearing, and at the same time cooperate with the overall active pure air cooling of the magnetic levitation rotating machine. The coaxial impeller at the other end of the main impeller is used for cooling, or the rotor is rotated by negative pressure cooling, or the main impeller is used for cooling. The traditional external passive heat dissipation is changed to internal active heat dissipation, which improves the heat dissipation efficiency while reducing the heat dissipation cost. This cooling scheme of magnetic levitation rotating machinery 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, 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 face of the thrust plate 3 and is opposite to and connected to the position of the coil slot 23 in the axial direction. Both the motor stator flow channel 230 and the motor rotor flow channel 250 can 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.

[0092] The present invention further arranges the air inlet of the second thrust disk at a position which is not opposite to the magnetic pole position of the axial stator 2, so that the end face of the thrust disk 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 levitation, further achieve the improved heat dissipation and cooling of the magnetic levitation bearing, and avoid the impact on the magnetic circuit of the magnetic levitation, further improve the magnetic levitation 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] 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;

[0095] The magnetic pole position of the axial stator 2 includes the part of the cover plate 2 4' opposite to the thrust plate 3, and the part of the radial inner part 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 part 2 22. The second thrust plate air inlet hole 02 is opposite to the ventilation groove 2 04' in the axial direction, and the radial dimension of the ventilation groove 2 04' 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 the coil, and the aperture 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 avoiding the impact on the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, and can also make the airflow resistance at both ends of the thrust plate small and the fluidity 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 2 = the radial cross-sectional area of ​​the relative portion of the thrust plate and the axial stator 2 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 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 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, which can enable the thrust plate ventilation hole to further effectively avoid the magnetic pole position of the axial stator 2, further avoiding the impact on the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, and can also make the airflow resistance at both ends of the thrust plate small and the fluidity good.

[0100] In some embodiments,

[0101] An axial stator inner ring hole 203' is provided on the radial inner side portion 22 at a position opposite to the ventilation groove 204', so that the axial stator inner ring hole 203' is connected to 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 flow 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 2 23 through the axial stator inner ring hole 2 03 ′, and further connected to the thrust plate air outlet 05 through the second thrust plate air inlet 02 .

[0103] The present invention further accelerates the gas flow in the coil slot cavity of the axial stator 2 by providing a ventilation groove 2 and an axial stator inner ring hole 2 (multiple gas flow paths) on the radial inner side 2, 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 inside 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. 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 arranges the air inlet of the second thrust disk 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 disk). 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, thereby increasing the flow rate of the incoming gas, realizing active ventilation and heat exchange of the thrust disk itself, accelerating the 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 enters the middle from both sides and is discharged through the thrust plate air outlet holes.

[0108] To facilitate negative pressure air intake, the direction of the inner ring air inlet is opposite to the direction of rotation. The air inlet is circumferentially greater than 90° from the direction of rotation, and the air outlet is radially oriented at ≥90° from the direction of rotation. There are no specific requirements for the hole shape; for ease of machining and processing, circular, rectangular, 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 of 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 magnetic saturation is achieved, and the axial aperture of the thrust plate air outlet 05 is calculated as follows: the axial thickness of the thrust plate 3 - N. In the present invention, the thrust plate preferably has a minimum axial width of N for the magnetic circuit flow area when magnetic saturation is achieved, and the axial aperture of the air outlet is calculated as follows: the thickness of the thrust plate - N. This effectively ensures maximum heat dissipation while not affecting axial magnetic circuit conduction.

[0116] In some embodiments,

[0117] A bearing air outlet 26 is further provided on the cylinder 19 at a position 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 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 smooth flow of gas 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 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 bearings, the relative position of the thrust disc and the axial magnetic pole is the output position. That is, the thrust disc end face facing the magnetic pole position cannot be perforated to avoid insufficient axial force. At the same time, cooling air cannot directly reach the magnetic pole gap position, which can reduce the impact of gas force on the axial force. According to the requirements of axial magnetic circuit flow, to ensure that the magnetic field saturation does not occur at other positions before the magnetic pole position, the cross-sectional area of ​​the magnetic circuit flow position in the radial circumferential direction ≥ the cross-sectional area of ​​the magnetic pole position. If the thrust disc 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 disc and the bearing stator - the cross-sectional area of ​​the thrust disc ventilation hole - the cross-sectional area of ​​the thrust disc outlet hole ≥ the cross-sectional area of ​​the magnetic pole position. It is preferably located between the upper and lower axial magnetic poles directly opposite the coil, with the aperture size ≤ the radial spacing between the upper and lower axial stator magnetic poles, and connected to the ventilation path at both ends without obstruction. The airflow resistance at both ends of the thrust disc is low, and the flow is good.

[0121] The entire system preferably uses an active pure air-cooled cooling system for heat dissipation. The cold air is driven by the coaxial impeller at the other end of the main impeller or the rotor rotates to centrifugally intake 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 and 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] The motor further includes a rear end cover 120, a cooling impeller 10, a rear casing 130, a barrel 19, and a rear radial bearing 140. The cooling impeller 10 is disposed at one axial end of the rotor 6 so as to rotate integrally with the rotor 6. The cooling impeller 10 is disposed inside the rear end cover 120. An axially penetrating air inlet 121 is disposed at the central axis of the rear end cover 120. The air inlet 121 faces 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 provided 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. 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 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 in sequence and enter the barrel flow channel 240, the motor stator flow channel 230 and the motor rotor flow channel 250 respectively.

[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 casing, the rear radial bearing and the cooling impeller structure. The cooling impeller can rotate as the rotor rotates as a whole, sucking gas from the air inlet into the interior of the rear end cover, and supplying it to the cylinder flow channel, the motor stator flow channel and the motor rotor flow channel respectively through the rear casing 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 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 cylinder 19 away from the rear end cover 120, and an accommodating space is formed between the front end cover 20 and the front housing 18, a front housing channel 27 is provided axially through the front housing 18, one end of the front housing channel 27 is opposite to and communicated with the accommodating space, and the other end is opposite to and communicated with the cylinder flow channel 240;

[0129] The airflow can 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 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 it 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 interior of the magnetic levitation bearing stator (especially the coil part), and discharge it 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 of the magnetic levitation rotating machinery of the present invention (preferably a blower, etc.), 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 assembled 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. The magnetic levitation 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 for cooling the impeller and a rear end cover 120 to increase air flow conduction and reduce flow resistance. Several corresponding ventilation holes or ventilation slots are opened on the rear housing 130, the cylinder 19, the front housing 18, the magnetic levitation axial bearing and other parts to facilitate 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: passes through the cylinder flow channel 240 → front shell channel 27 → front radial bearing 17 and then passes through the axial stator inner ring hole 03, ventilation groove 04 and thrust plate Y-type inclined hole at the axial magnetic bearing to cool the axial bearing and thrust plate 3, and is discharged from the bearing outlet 26 to the cylinder 19; the second path: passes through the motor stator flow channel 230 to cool the motor stator 15; the third path: first cools the rear radial bearing 140 and then passes through the motor rotor flow channel 250 to cool the rotor 6 and the motor stator 15, and converges 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 thrust plate 3, and is discharged from the bearing outlet 26 to the cylinder 19. This flow channel structure arrangement can effectively cool the heat-generating components such as the motor stator, rotor, radial bearings, and axial bearings. At the same time, a Y-shaped inclined hole is provided on the thrust plate of the high-heat-generating components 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 entire 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. This invention provides Y-shaped inclined holes on the thrust plate for high-heat-generating components. Negative pressure is used to draw heat out through the Y-shaped inclined hole flow channel. Inclined holes are drilled on both sides of the thrust plate between the two magnetic poles until they converge in the middle. Further inclined holes are drilled upward to the outer ring surface of the thrust plate. A through hole on the inner ring surface of the axial stator cooperates with the Y-shaped hole air inlet of the thrust plate, enabling active cooling and accelerating heat dissipation, increasing cooling flow, and not affecting the axial magnetic circuit.

[0134] 2. The present invention provides an integrated, efficient, pure air-cooled heat dissipation system. The active pure air-cooled heat dissipation system reduces heat dissipation costs. 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 levitation rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator or a compressor), which includes the aforementioned magnetic levitation bearing.

[0136] Figure 1 The figure shows the internal axial bearing cooling path of a magnetically levitated rotating machine (preferably a blower) according to the present invention. The three oblique holes, namely the first thrust disc air inlet hole 01 (an oblique hole), the second thrust disc air inlet hole 02 (an oblique hole), and the thrust disc air outlet hole 05 (an oblique hole), form a Y-shaped thrust disc oblique hole. The axial stator inner ring hole 1 03 and ventilation groove 1 04 cooperate with the thrust disc Y-shaped hole air inlet. This cooling path is as follows: cooling gas passes through the axial stator inner ring hole 1 03 (axial stator inner ring hole 2 03') → ventilation groove 1 04 (ventilation groove 2 04'), and then converges from the first thrust disc air inlet hole 01 and the second thrust disc air inlet hole 02 on both sides of the thrust disc to the thrust disc air outlet hole 05, effectively dissipating heat from the axial stator and axial winding. During operation, the air intake direction of the first and second thrust disc air inlet holes is opposite to the direction of rotor rotation. Negative pressure is used to draw the gas in the ventilation grooves into the thrust disc oblique holes before discharging it to dissipate heat. This cooling path achieves effective self-dissipating heat dissipation. In order to make the thrust plate take in negative pressure air, the air 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 air intake direction and the rotor rotation direction. If the rotation direction of the air 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 air 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. The same applies vice versa. 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 merely 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 principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A magnetic levitation rotating machine, characterized in that: include: A cylinder (19), a magnetic suspension bearing, a motor stator and a rotor (6), wherein the motor stator is located on the radial outer periphery of a portion of the shaft section of the rotor (6), the magnetic suspension 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 through the motor stator, a portion of the rotor (6) opposite to the motor stator forms a motor rotor flow channel (250) in the rotor air gap, and the cylinder flow channel (240), the motor stator flow channel (230) and the motor rotor flow channel (250) are all capable of circulating gas; the magnetic suspension bearing is located on one axial side 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 disc (3); in the axial direction of the magnetic bearing, the thrust disc (3) is arranged between the axial stator 1 (1) and the axial stator 2 (2); a thrust disc ventilation hole is provided on the thrust disc (3) from one axial end face to the other axial end face; 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 spaced apart in the radial direction of the axial stator 1 (1), and a coil slot 1 (13) is formed between the two, and a coil 1 (5) is provided 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 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), wherein 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 discharged 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 the axial end surface of the thrust plate (3) and is opposite to and connected to the position of the coil slot one (13) in the axial direction, the cylindrical 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 one (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 disk (3), and an axial end face of the cover plate (4) being connected to the radial outer portion (11) of the axial stator (1), and the other axial end face of the cover plate (4) being opposite to the thrust disk (3); The magnetic pole position of the axial stator 1 (1) includes a portion of the cover plate 1 (4) opposite to the thrust disk (3), and a portion of the radial inner portion 1 (12) opposite to the thrust disk (3); a ventilation groove 1 (04) is provided between the cover plate 1 (4) and the radial inner portion 1 (12); the first thrust disk air inlet hole (01) and the ventilation groove 1 (04) are opposite to each other in the axial direction, and the radial dimension of the ventilation groove 1 (04) is greater than or equal to the 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 of the axial stator (1) = the radial cross-sectional area of ​​the relative portion of the thrust disk and 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).

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 (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 (01) in sequence to flow 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 the 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 the 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), and the plurality of first thrust plate air inlet holes (01) are arranged at intervals along the circumferential direction of the thrust plate (3), and the extension direction of each first thrust plate air inlet hole (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).

7. The magnetic levitation rotating machine according to claim 1, characterized in that: The axial stator 2 (2) includes a radial outer portion 2 (21) and a radial inner portion 2 (22), 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 second thrust plate air inlet (02) is located at one end of the other axial end face of the thrust plate (3) and is opposite to and connected to the position of the coil slot 2 (23) in the axial direction, the motor stator flow channel (230) and the motor rotor flow channel (250) can both be connected to the second thrust plate air inlet (02); and the one end of the second thrust plate air inlet (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 cover plate 2 (4'), the cover plate 2 (4') is located between the axial stator 2 (2) and the thrust disk (3), and one axial end surface of the cover plate 2 (4') is connected to the radial outer portion 2 (21) of the axial stator 2 (2), and the other axial end surface of the cover plate 2 (4') is opposite to the thrust disk (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 the radial dimension of the ventilation groove 2 (04') is greater than or equal to the 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 relative 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 on the radial inner side portion 2 (22) at a position 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 (05) through the second thrust plate air inlet (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 (02) in sequence to flow to the thrust plate air outlet (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 (05) through the second thrust plate air inlet (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 viewed 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), and the plurality of 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).

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. 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).

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 circuit flow area of ​​N when magnetic saturation is achieved, and the axial aperture of the thrust disk air outlet (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 13, characterized in that: A bearing air outlet (26) is also provided on the cylinder (19) at a position opposite to the thrust plate air outlet (05) of the thrust plate (3), and can be used to connect with the thrust plate air outlet (05) and exhaust air outward.

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 be able 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 provided at the central axis position of the rear end cover (120), and 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 provided 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); 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).

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 cylinder (19) away from the rear end cover (120), and an accommodating 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 axial direction, one end of the front housing channel (27) is opposite to and communicates with the accommodating space, and the other end is opposite to and communicates with the cylinder flow channel (240); The airflow is allowed to sequentially 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, 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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