Magnetic levitation rotating machine

Abstract

The application provides a magnetic suspension rotating machine, which comprises a magnetic suspension bearing, a motor stator and a rotor; a thrust disc is arranged between an axial stator one and an axial stator two, a thrust disc air hole is arranged through the axial one end surface to the axial other end surface of the thrust disc, the axial stator one comprises a radial outer side one and a radial inner side one, the radial outer side one and the radial inner side one are arranged in the radial direction of the axial stator one, and a coil groove one is formed between the radial outer side one and the radial inner side one, a coil one is arranged in the coil groove one, the position of the first thrust disc air hole at one end of the axial one end surface of the thrust disc is opposite to the position of the coil groove one in the axial direction, and the motor rotor flow channel and the motor stator flow channel can be communicated with the bearing stator air hole one; the position of the first thrust disc air hole is not opposite to the magnetic pole position of the axial stator one. According to the application, the heat dissipation and cooling of the magnetic suspension bearing are improved, the influence on the magnetic suspension magnetic circuit is avoided, and sufficient magnetic suspension supporting force is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic suspension bearing, in particular to a kind of magnetic suspension rotating machinery. BACKGROUND

[0002] At present, the heat dissipation of magnetic suspension rotating machinery is mainly external cooling equipment, which is usually external cooling fan, water cooling system and heat exchanger etc., with high maintenance cost, complex structure system and increased safety hazard. Or in the form of negative pressure, the air is sucked from the inside of the magnetic suspension rotating machinery to guide the heat out, which cannot effectively realize the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearing, which affects the stable operation of magnetic suspension air compressor.

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft, and an axial force component, i.e. the thrust disc, is indispensable on the rotating shaft. The axial magnetic bearing and the thrust disc are made of pure iron solid structure, which has large self-loss, general heat conduction performance and small space. If not effectively cooled, it will heat up seriously. In general, in order to avoid high temperature rise of the axial magnetic bearing, forced air cooling is often applied to the magnetic bearing for heat dissipation. The cooling air is input from the outside and passes through the gap between the bearing stator and the thrust disc to dissipate heat from the axial magnetic bearing, but the heat dissipation efficiency is not high.

[0004] Since the magnetic suspension bearing in the rotating machinery of the prior art has the technical problems of poor cooling and heat dissipation effect, the present application designs a kind of magnetic suspension rotating machinery. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the defects of poor cooling and heat dissipation effect of the magnetic suspension bearing in the rotating machinery of the prior art, so as to provide a kind of magnetic suspension rotating machinery.

[0006] In order to solve the above problems, the present application provides a kind of magnetic suspension rotating machinery, which comprises:

[0007] Magnetic suspension bearing, motor stator and rotor, the motor stator is located in the radial outer periphery of part of the shaft section of the rotor, the motor stator is provided with motor stator flow channel in the axial direction, the rotor and the motor stator opposite part exists rotor air gap to form motor rotor flow channel, the motor stator flow channel and the motor rotor flow channel can flow gas;The magnetic suspension bearing is located on the axial side of the motor stator and can support the rotor;

[0008] The magnetic suspension bearing comprises an axial stator one, an axial stator two and a thrust disc, the thrust disc is arranged between the axial stator one and the axial stator two in the axial direction of the magnetic suspension bearing, the thrust disc is provided with a thrust disc air hole penetrating from the axial one end surface to the axial other end surface of the thrust disc, the axial stator one comprises a radial outer side one and a radial inner side one, the radial outer side one and the radial inner side one are arranged in the radial direction of the axial stator one and are spaced apart, and a coil groove one is formed between the radial outer side one and the radial inner side one, and a coil one is arranged in the coil groove one;

[0009] The thrust disc air hole comprises a first thrust disc air inlet hole extending from the axial one end surface of the thrust disc towards the inside of the thrust disc and a second thrust disc air inlet hole extending from the axial other end surface of the thrust disc towards the inside of the thrust disc, one end of the first thrust disc air inlet hole inside the thrust disc is communicated with one end of the second thrust disc air inlet hole inside the thrust disc, and after the communication, the communication is connected to the outer periphery of the thrust disc through a thrust disc air outlet hole, one end of the first thrust disc air inlet hole at the axial one end surface of the thrust disc is opposite to the position of the coil groove one in the axial direction, and the one end of the first thrust disc air inlet hole is not opposite to the position of the magnetic pole of the axial stator one;

[0010] The axial stator one further comprises an axial outer side one, the axial outer side one is arranged away from the thrust disc relative to the coil one in the axial direction of the magnetic suspension bearing,

[0011] The axial outer side one of the axial stator one is provided with a bearing stator air hole one penetrating from the axial one end surface to the axial other end surface of the axial outer side one, the bearing stator air hole one can be communicated with the first thrust disc air inlet hole; the motor rotor flow channel can be communicated with the bearing stator air hole one and the motor stator flow channel respectively;

[0012] Further comprising a front radial bearing and a front housing, the front radial bearing is located between the magnetic suspension bearing and the motor stator, and the front housing is located at the outer periphery of the front radial bearing.

[0013] In some embodiments,

[0014] Inside the coil groove one, a second gap is formed between the radial inner side of the coil one and the radial inner side one, forming a first gas flow path,

[0015] Inside the coil groove one, a third gap is also formed between the axial outer side one and the coil one, forming a bearing stator air groove one;

[0016] The bearing stator vent hole one is communicated with the bearing stator vent groove one, and further communicated to the first thrust disc air inlet hole through the first gas flow path.

[0017] In some embodiments,

[0018] Further comprising a cover plate one, which is located between the axial stator one and the thrust disc, and an axial one end surface of the cover plate one is in contact with the radial outer side one of the axial stator one, and an axial other end surface of the cover plate one is opposite to the thrust disc;

[0019] The magnetic pole position of the axial stator one includes the part opposite to the thrust disc of the cover plate one and the part opposite to the thrust disc of the radial inner side one, and the first gap is between the cover plate one and the radial inner side one, the first thrust disc air inlet hole is opposite to the first gap in the axial direction, and the radial dimension of the first gap is greater than or equal to the radial dimension of the first thrust disc air inlet hole.

[0020] In some embodiments,

[0021] In any radial section of the thrust disc, the magnetic path flow position cross-sectional area of the axial stator one is equal to the radial cross-sectional area of the part opposite to the axial stator one of the thrust disc minus the thrust disc air inlet hole cross-sectional area minus the thrust disc air outlet hole cross-sectional area, which is greater than or equal to the magnetic pole position cross-sectional area of the axial stator one.

[0022] In some embodiments,

[0023] In the axial direction of the thrust disc, the first thrust disc air inlet hole is a slanted hole structure whose extension direction is not parallel to the axis of the thrust disc, and in the observation direction from the axial one end surface to the axial other end surface of the thrust disc, the rotation direction of the thrust disc is toward the first rotation direction, the extension direction of the first thrust disc air inlet hole from the axial one end surface to the axial other end surface is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0024] In some embodiments,

[0025] The first thrust disc air inlet hole is a plurality of holes, and the plurality of first thrust disc air inlet holes are arranged at intervals along the circumferential direction of the thrust disc, and the extension direction of each of the first thrust disc air inlet holes from the axial one end surface to the axial other end surface is toward the second rotation direction, which is opposite to the first rotation direction of the thrust disc.

[0026] In some embodiments,

[0027] The axial stator two includes a radially outer portion two and a radially inner portion two, which are arranged in a radial direction of the axial stator two and form a coil slot two therebetween, and the coil two is arranged in the coil slot two, and the second thrust disc air inlet hole is located at one end of an axial end surface of the thrust disc opposite to a position of the coil slot two in the axial direction, and the one end of the second thrust disc air inlet hole is opposite to the magnetic pole position of the axial stator two.

[0028] The axial stator two further includes an axial outer portion two, which is arranged away from the thrust disc relative to the coil two in the axial direction of the magnetic suspension bearing,

[0029] The axial outer portion two of the axial stator two is provided with a bearing stator air vent two, which penetrates from an axial one end surface to an axial other end surface of the axial outer portion two, and the bearing stator air vent two can communicate with the second thrust disc air inlet hole;

[0030] The motor rotor flow channel communicates with the bearing stator air vent one or the bearing stator air vent two.

[0031] In some embodiments,

[0032] Inside the coil slot two, there is a fifth gap between the radially inner side of the coil two and the radially inner portion two, forming a second gas flow path,

[0033] Inside the coil slot two, there is also a sixth gap between the axial outer portion two and the coil two, forming a bearing stator air vent slot two;

[0034] The bearing stator air vent two communicates with the bearing stator air vent slot two and further communicates to the second thrust disc air inlet hole through the second gas flow path.

[0035] In some embodiments,

[0036] Further comprising a cover plate two, which is located between the axial stator two and the thrust disc, and an axial one end surface of the cover plate two is in contact with the radially outer portion two of the axial stator two, and an axial other end surface of the cover plate two is opposite to the thrust disc;

[0037] The magnetic pole position of the axial stator two includes a portion opposite to the thrust disc of the cover plate two and a portion opposite to the thrust disc of the radially inner portion two, and there is a fourth gap between the cover plate two and the radially inner portion two, the second thrust disc air inlet hole is opposite to the fourth gap in the axial direction, and the fourth gap has a radial dimension greater than or equal to a radial dimension of the second thrust disc air inlet hole.

[0038] In some embodiments,

[0039] In each radial section of the thrust disc, the magnetic circuit of the second axial stator flows through a position cross-sectional area = the radial cross-sectional area of the thrust disc and the opposite part of the second axial stator - the cross-sectional area of the thrust disc air inlet - the cross-sectional area of the thrust disc air outlet ≥ the pole position cross-sectional area of the second axial stator.

[0040] In some embodiments,

[0041] In the axial direction of the thrust disc, the second thrust disc air inlet is a inclined hole structure whose extension direction is not parallel to the axis of the thrust disc, and from the observation direction from the axial other end surface to the axial one end surface of the thrust disc, the rotation direction of the thrust disc is toward the third rotation direction, the extension direction of the second thrust disc air inlet from the axial other end surface to the axial one end surface is toward the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0042] In some embodiments,

[0043] The second thrust disc air inlet is a plurality of second thrust disc air inlets, and the extension direction of each of the plurality of second thrust disc air inlets from the axial other end surface to the axial one end surface is toward the fourth rotation direction, which is opposite to the third rotation direction of the thrust disc.

[0044] In some embodiments,

[0045] The first thrust disc air inlet, the thrust disc air outlet, and the second thrust disc air inlet correspond one-to-one to form a group of air outlet units, and the air outlet units are a plurality of groups, and the plurality of groups of air outlet units are arranged in the circumferential direction of the thrust disc.

[0046] In some embodiments,

[0047] The axial width of the magnetic circuit flow area of the thrust disc when the magnetic saturation is satisfied is N, and the axial hole diameter of the thrust disc air outlet = the axial thickness of the thrust disc - N.

[0048] In some embodiments,

[0049] The outer periphery of the first axial stator and the second axial stator further has a cylinder, and the position opposite to the thrust disc air outlet of the thrust disc of the cylinder is further provided with a bearing air outlet, which can be used to communicate with the thrust disc air outlet and exhaust air outward.

[0050] In some embodiments,

[0051] The rear end cover, the cooling impeller, the rear shell and the rear radial bearing, the cooling impeller is arranged at one axial end of the rotor and can rotate integrally with the rotor, the cooling impeller is arranged in the interior of the rear end cover, the central axis of the rear end cover is provided with an axial first air inlet, the first air inlet is opposite to the cooling impeller, and the magnetic suspension bearing and the motor stator are arranged in the interior of the barrel.

[0052] The rear shell is connected between the rear end cover and the barrel in the axial direction, and the rear shell is provided with a rear shell flow channel in the axial direction, one end of the rear shell flow channel can communicate with the motor rotor flow channel, and the other end of the rear shell flow channel can communicate with the impeller air outlet of the cooling impeller.

[0053] The air flow can sequentially pass through the first air inlet, the cooling impeller, the interior of the rear end cover and the rear shell flow channel and enter the motor rotor flow channel.

[0054] In some embodiments,

[0055] The front end cover, the front radial bearing flow channel between the front radial bearing and the outer periphery of the rotor, the front shell flow channel between the front shell and the outer periphery of the rotor, the front end cover arranged at the axial side of the barrel away from the rear end cover, the front shell third flow channel arranged on the outer periphery of the front radial bearing on the front shell, the front shell first flow channel and the front shell third flow channel can both communicate with the bearing stator vent two, the front shell second flow channel arranged on the outer periphery of the front shell third flow channel on the front shell, the front shell second flow channel extending in the axial direction and communicating with the bearing air outlet.

[0056] The outer periphery of the front end cover is provided with a volute, the axial other end of the rotor is provided with a main impeller, the main impeller is located in the volute, the central axis of the volute is provided with a second air inlet, the second air inlet is opposite to the main impeller, the main impeller and the front end cover have a leakage channel, the front end cover and the outer periphery of the rotor have a front end cover flow channel,

[0057] The second air inlet, the main impeller, the leakage channel, the front end cover flow channel and the bearing stator vent one of the magnetic suspension bearing are sequentially communicated, and then exhaust through the bearing air outlet.

[0058] The inner and outer peripheral walls of the barrel are provided with a motor air outlet, the motor air outlet is opposite to and communicates with the motor stator flow channel; the motor rotor flow channel, the motor stator flow channel and the motor air outlet are sequentially communicated.

[0059] The magnetic suspension rotating machine has the following beneficial effects:

[0060] 1. The present application can realize active air suction and heat exchange by the thrust disc ventilation hole and the thrust disc air outlet hole opened on the thrust disc, the thrust disc ventilation hole includes a first thrust disc air inlet hole extending from one axial end face of the thrust disc towards the inside of the thrust disc, and a second thrust disc air inlet hole extending from the other axial end face of the thrust disc towards the inside of the thrust disc, the gas flow entering is increased to accelerate the cooling of the axial magnetic bearing, the thrust disc itself is actively cooled, the cooling flow is increased to accelerate the heat dissipation of the axial coil, the cooling and heat dissipation effect of the magnetic suspension bearing is improved, the first thrust disc air inlet hole is not opposite to the magnetic pole position of the axial stator one, the thrust disc end face is not punched at the position opposite to the magnetic pole position of the axial stator one, the cooling air cannot directly reach the magnetic pole gap position, the influence of the cooling gas and the hole on the magnetic furnace structure is effectively avoided, the insufficient magnetic suspension supporting force is avoided, the cooling and heat dissipation of the magnetic suspension bearing is improved, the influence on the magnetic suspension magnetic circuit is avoided, the sufficient magnetic suspension supporting force is ensured, the influence of the gas force on the axial force is effectively reduced, the thrust disc ventilation hole is preferably arranged at the position opposite to the coil between the upper and lower magnetic poles in the axial direction, the hole diameter is less than or equal to the radial distance between the upper and lower magnetic poles of the axial stator, the thrust disc ventilation hole can further effectively avoid the magnetic pole position and further avoid the influence on the magnetic circuit, the thrust disc ventilation hole is connected to the ventilation path at both ends without obstruction, the airflow resistance at both ends of the thrust disc is small, and the flowability is good.

[0061] The present application further comprises a motor stator flow channel arranged on the motor stator and a motor rotor flow channel arranged on the rotor, the cooling gas in the air inlet enters the motor rotor from the rear shell, is then divided into two paths, one path flows out from the motor stator, and the other path flows out from the axial magnetic suspension bearing (thrust disc inclined hole + axial bearing stator ventilation hole), the airflow flow area of the magnetic suspension bearing and the motor stator is increased, the cooling and heat dissipation efficiency and performance of the magnetic suspension machine is further improved, the present application has two air inlets at both ends in the axial direction, the two paths of gas flow towards the magnetic suspension bearing, and are mixed in the inside of the thrust disc of the magnetic suspension bearing, and finally are discharged from the bearing air outlet, the airflow flow path of the magnetic suspension bearing is increased, the heat exchange area is increased, and the cooling and heat dissipation performance is improved.

[0062] 2. The application further comprises: in any radial section of the thrust disc, the axial stator one magnetic circuit flows through the position cross-sectional area = the radial cross-sectional area of the thrust disc and the axial stator one opposite part - the thrust disc vent hole cross-sectional area - the thrust disc air outlet hole cross-sectional area ≥ the axial stator one magnetic pole position cross-sectional area, so that the other magnetic circuit part on the thrust disc that is different from the magnetic pole position will not appear magnetic field saturation before the magnetic pole position, ensuring the formation of a normal magnetic flux loop and ensuring the continuous and effective provision of magnetic suspension support force; the first thrust disc air inlet hole is set to extend from the axial one end surface to the axial other end surface in the direction of the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disc), so that negative pressure is generated when the rotor drives the thrust disc to rotate at high speed, hot air at one end is sucked out and discharged to the outside, the gas flow is increased, the thrust disc is actively ventilated and heat exchanged, the gas flow is accelerated, the energy consumption is saved, the heat dissipation performance is improved, and the energy efficiency is improved; at the same time, the axial outer part one is provided with a bearing stator vent hole one, a stator vent groove one and a gas flow path (a plurality of gas flow paths) in the axial stator coil groove, which can further accelerate the gas flow in the axial stator coil groove cavity and realize effective and independent heat dissipation of the axial coil and the thrust disc. BRIEF DESCRIPTION OF DRAWINGS

[0063] Figure 1 is a longitudinal sectional view of the magnetic suspension bearing of the magnetic suspension rotating machine of the application;

[0064] Figure 2 is Figure 1 is a three-dimensional internal structure diagram of the thrust disc structure in

[0065] Figure 3 is a three-dimensional structure diagram of the axial stator core of the magnetic suspension bearing of the application;

[0066] Figure 4 is a longitudinal sectional view of the magnetic suspension rotating machine of the application.

[0067] The reference signs are as follows:

[0068] 1, axial stator one; 11, radial outer side one; 12, radial inner side one; 13, coil slot one; 14, axial outer side one; 2, axial stator two; 21, radial outer side two; 22, radial inner side two; 23, coil slot two; 24, axial outer side two; 3, thrust disc; 4, cover plate one; 4', cover plate two; 5, coil one; 5', coil two; 6, rotor; 10, cooling impeller; 110, guide plate; 120, rear end cover; 121, first 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; 25, motor rotor flow channel; 26, bearing air outlet; 28, motor air outlet; 29, leakage passage; 30, main impeller; 31, volute; 311, second air inlet; 32, stator housing; 33, flow channel four; 35, protection bearing; 35, flow channel five; 36, front housing second flow channel; 37, front housing third flow channel;

[0069] 01, first thrust disc air inlet; 02, second thrust disc air inlet; 03, bearing stator air hole one; 03', bearing stator air hole two; 04, bearing stator air groove one; 04', bearing stator air groove two; 05, first gap; 06, first gas flow path; 07, fourth gap; 08, second gas flow path; 09, thrust disc air outlet. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0071] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0072] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0073] In the description of the present application, it is to be understood that the orientation terms such as "front", "back", "up", "down", "left", "right", "transverse", "vertical", "horizontal", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings generally for the purpose of describing and simplifying the present application, and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

[0074] For the purpose of description, spatial relative terms, such as "above", "upper", "up", "below", "lower", etc., can be used herein for describing the spatial relationship between one device or feature and another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, the device described as "above" or "above" the other device or structure will be positioned "below" or "below" the other device or structure. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein should be interpreted accordingly.

[0075] In addition, it should be noted that the use of the terms "first", "second", etc. to describe various components is merely intended to distinguish one component from another, and the above terms do not have special meanings unless otherwise stated, and therefore cannot be construed as limiting the scope of protection of the present application.

[0076] As Figures 1-4As shown, the application provides a magnetic suspension rotating machine, characterized in that it comprises:

[0077] A magnetic suspension bearing, a motor stator 15 located at the radial outer periphery of a partial shaft section of the rotor 6, and a rotor 6, the motor stator 15 is provided with a motor stator flow channel 230 in the axial direction, and the rotor 6 opposite to the motor stator is provided with a rotor air gap to form a motor rotor flow channel 25 (i.e. the motor rotor flow channel is formed between the rotor and the stator), the motor stator flow channel 230 and the motor rotor flow channel 25 can flow through the gas; the magnetic suspension bearing is located on one side of the motor stator in the axial direction and can support the rotor 6;

[0078] The magnetic suspension bearing comprises an axial stator one 1, an axial stator two 2 and a thrust disc 3, in the axial direction of the magnetic suspension bearing, the thrust disc 3 is arranged between the axial stator one 1 and the axial stator two 2, the thrust disc 3 is provided with a thrust disc ventilation hole from the axial one end surface to the axial other end surface, the axial stator one 1 comprises a radial outer side one 11 and a radial inner side one 12, the radial outer side one 11 and the radial inner side one 12 are arranged in the radial direction of the axial stator one 1, and a coil groove one 13 is formed between them, and a coil one 5 is arranged in the coil groove one 13;

[0079] The thrust disc ventilation hole comprises a first thrust disc air inlet hole 01 extending from the axial one end surface of the thrust disc 3 to the inside of the thrust disc 3, and a second thrust disc air inlet hole 02 extending from the axial other end surface of the thrust disc 3 to the inside of the thrust disc 3, one end of the first thrust disc air inlet hole 01 inside the thrust disc 3 communicates with one end of the second thrust disc air inlet hole 02 inside the thrust disc 3, and then communicates to the outer periphery of the thrust disc 3 through a thrust disc air outlet hole 09, one end of the first thrust disc air inlet hole 01 at the axial one end surface of the thrust disc 3 is opposite to the position of the coil groove one 13 in the axial direction, and the one end of the first thrust disc air inlet hole 01 is not opposite to the position of the magnetic pole of the axial stator one 1;

[0080] The axial stator one 1 further comprises an axial outer side one 14, which is arranged away from the thrust disc 3 relative to the coil one 5 in the axial direction of the magnetic suspension bearing,

[0081] The axial outer side one 14 of the axial stator one 1 is provided with a bearing stator ventilation hole one 03, which penetrates from the axial one end surface to the axial other end surface of the axial outer side one 14, and the bearing stator ventilation hole one 03 can communicate with the first thrust disc air inlet hole 01; the motor rotor flow channel 25 can respectively communicate with the bearing stator ventilation hole one 03 and the motor stator flow channel 230.

[0082] Also included are a front radial bearing 17 located between the magnetic levitation bearing and the motor stator, and a front housing 18 located at the outer periphery of the front radial bearing 17.

[0083] The present application can realize active air suction and heat exchange by the thrust disc air hole and the thrust disc air outlet hole, increase the air flow, accelerate the axial magnetic bearing cooling, actively cool the thrust disc, increase the cooling flow, accelerate the axial coil heat dissipation, improve the cooling and heat dissipation effect of the magnetic levitation bearing, and the first thrust disc air inlet hole is not opposite to the magnetic pole position of the axial stator one, so that the thrust disc end face is not punched at the position opposite to the magnetic pole position of the axial stator one, the cooling air cannot directly reach the magnetic pole gap position, the influence of the cooling gas and the hole on the magnetic furnace structure can be effectively avoided, the magnetic levitation supporting force is avoided, the cooling and heat dissipation of the magnetic levitation bearing are improved, the influence on the magnetic levitation magnetic circuit is avoided, the sufficient magnetic levitation supporting force is ensured, the influence of the gas force on the axial force is effectively reduced, the axial stator ventilation hole one is arranged on the first axial outer part, the axial stator ventilation hole one can communicate with the first thrust disc air inlet hole, the airflow circulation channel can be provided, the axial stator coil slot cavity gas flow can be further accelerated, and the effective independent heat dissipation of the axial coil and the thrust disc is realized.

[0084] The present application can realize active air suction and heat exchange by the thrust disc air hole and the thrust disc air outlet hole, increase the air flow, accelerate the axial magnetic bearing cooling, actively cool the thrust disc, increase the cooling flow, accelerate the axial coil heat dissipation, improve the cooling and heat dissipation effect of the magnetic levitation bearing, and the first thrust disc air inlet hole is not opposite to the magnetic pole position of the axial stator one, so that the thrust disc end face is not punched at the position opposite to the magnetic pole position of the axial stator one, the cooling air cannot directly reach the magnetic pole gap position, the influence of the cooling gas and the hole on the magnetic furnace structure can be effectively avoided, the magnetic levitation supporting force is avoided, the cooling and heat dissipation of the magnetic levitation bearing are improved, the influence on the magnetic levitation magnetic circuit is avoided, the sufficient magnetic levitation supporting force is ensured, the influence of the gas force on the axial force is effectively reduced, the axial stator ventilation hole one is arranged on the first axial outer part, the axial stator ventilation hole one can communicate with the first thrust disc air inlet hole, the airflow circulation channel can be provided, the axial stator coil slot cavity gas flow can be further accelerated, and the effective independent heat dissipation of the axial coil and the thrust disc is realized.

[0085] In some embodiments,

[0086] Inside the coil groove one 13, the radial inner side of the coil one 5 and the radial inner side one 12 have a second gap, forming a first gas flow path 06,

[0087] In the inside of the coil slot 13, the third gap is formed between the axial outer side 14 and the coil 5, forming the bearing stator ventilation slot 04;

[0088] The bearing stator ventilation hole 03 is communicated with the bearing stator ventilation slot 04, and further communicated with the first thrust disc air inlet hole 01 through the first gas flow path 06.

[0089] The present application is provided with the bearing stator ventilation hole 03, the stator ventilation slot 04 and the gas flow path in the axial stator coil slot, which can form multiple gas flow paths from both sides to the thrust disc ventilation hole of the thrust disc, and further accelerate the gas flow in the axial stator coil slot, realizing the effective and independent heat dissipation of the axial coil and the thrust disc.

[0090] In some embodiments,

[0091] Further comprising a cover plate 04, which is located between the axial stator 01 and the thrust disc 03, and the axial one end surface of the cover plate 04 is connected with the radial outer side 11 of the axial stator 01, and the axial other end surface of the cover plate 04 is opposite to the thrust disc 03;

[0092] The magnetic pole position of the axial stator 01 includes the part opposite to the thrust disc 03 of the cover plate 04 and the part opposite to the thrust disc 03 of the radial inner side 12, and the first gap 05 is formed between the cover plate 04 and the radial inner side 12, the first thrust disc air inlet hole 01 is opposite to the first gap 05 in the axial direction, and the radial size of the first gap 05 is greater than or equal to the radial size of the first thrust disc air inlet hole 01.

[0093] The present application further preferably sets the thrust disc ventilation hole at the position opposite to the coil between the upper and lower magnetic poles in the axial direction, and the hole diameter is less than or equal to the radial distance between the upper and lower magnetic poles of the axial stator, which can make the first thrust disc air inlet hole further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the thrust disc ventilation hole is communicated with the ventilation path at both ends without obstruction, which can also make the air flow resistance at both ends of the thrust disc small and the flowability good; and the bearing stator ventilation hole 03, the bearing stator ventilation slot 04, the first gas flow path 06, the first gap 05 and the first thrust disc air inlet hole 01 are sequentially communicated to form the gas flow path.

[0094] In some embodiments,

[0095] In any radial section of the thrust disc 03, the cross-sectional area of the magnetic circuit flowing position of the axial stator 01 is equal to the radial cross-sectional area of the part opposite to the axial stator 01 of the thrust disc minus the cross-sectional area of the thrust disc ventilation hole minus the cross-sectional area of the thrust disc air outlet hole 09, which is greater than or equal to the cross-sectional area of the magnetic pole position of the axial stator 01.

[0096] The application further comprises the following arrangement in any radial section of the thrust disc: the position section area of the magnetic circuit of the axial stator one = the radial section area of the thrust disc and the relative part of the axial stator one - the section area of the thrust disc air inlet hole - the section area of the thrust disc air outlet hole ≥ the pole position section area of the axial stator one, so that the other magnetic circuit part on the thrust disc different from the pole position does not appear magnetic field saturation before the pole position, and normal magnetic flux loop is formed, and the continuous and effective magnetic suspension supporting force is ensured.

[0097] In some embodiments,

[0098] In the axial direction of the thrust disc 3, the first thrust disc air inlet hole 01 is a inclined hole structure whose extension direction is not parallel to the axis of the thrust disc 3, and in the observation direction from the axial one end surface of the thrust disc 3 to the axial other end surface, the rotation direction of the thrust disc 3 is toward the first rotation direction, the extension direction of the first thrust disc air inlet hole 01 from the axial one end surface to the axial other end surface is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0099] The application further comprises the following arrangement in any radial section of the thrust disc: the position section area of the magnetic circuit of the axial stator one = the radial section area of the thrust disc and the relative part of the axial stator one - the section area of the thrust disc air inlet hole - the section area of the thrust disc air outlet hole ≥ the pole position section area of the axial stator one, so that the other magnetic circuit part on the thrust disc different from the pole position does not appear magnetic field saturation before the pole position, and normal magnetic flux loop is formed, and the continuous and effective magnetic suspension supporting force is ensured.

[0100] The application is convenient for negative pressure air inlet, the air inlet hole is opposite to the rotation direction in the circumferential direction, and the air outlet hole is opposite to the rotation direction in the radial direction. The hole type is not required, and a circular hole, a rectangular circular hole or an oval hole is preferred for machining and process.

[0101] In some embodiments,

[0102] The first thrust disc air inlet hole 01 is multiple, multiple first thrust disc air inlet holes 01 are arranged in the circumferential direction of the thrust disc 3, and the extension direction of each first thrust disc air inlet hole 01 from the axial one end surface to the axial other end surface is toward the second rotation direction, and opposite to the first rotation direction of the thrust disc 3.

[0103] The application provides a magnetic suspension rotating machine (preferably a blower) with active and efficient heat dissipation, wherein a Y-shaped inclined hole scheme is adopted in a thrust disc to realize active air suction and heat exchange at high rotating speed, increase the flow of the air entering, accelerate the pushing of the axial magnetic bearing cooling, and simultaneously cooperate with the overall active pure air cooling of the magnetic suspension rotating machine to realize cooling by the coaxial impeller at the other end of the main impeller or the rotating negative pressure of the rotor or the leakage of the main impeller, so that the heat dissipation is changed from the previous external passive heat dissipation to internal active heat dissipation, the heat dissipation efficiency is improved, and the heat dissipation cost is reduced. The cooling scheme of the magnetic suspension rotating machine can effectively realize ventilation and heat dissipation of the motor stator, the motor rotor and the magnetic bearing, and can also better realize heat dissipation of the axial magnetic bearing, and improve the stability of the magnetic suspension system.

[0104] In some embodiments,

[0105] The axial stator two 2 comprises a radial outer side two 21 and a radial inner side two 22, the radial outer side two 21 and the radial inner side two 22 are arranged in a radial direction of the axial stator two 2, and a coil groove two 23 is formed between the radial outer side two 21 and the radial inner side two 22, a coil two 5' is arranged in the coil groove two 23, the second thrust disc air inlet hole 02 is located at one end of an axial end face of the thrust disc 3, and the one end of the second thrust disc air inlet hole 02 is opposite to the position of the coil groove two 23 in the axial direction, and the one end of the second thrust disc air inlet hole 02 is not opposite to the magnetic pole position of the axial stator two 2;

[0106] The axial stator two 2 further comprises an axial outer side two 24, which is arranged away from the thrust disc 3 relative to the coil two 5' in the axial direction of the magnetic suspension bearing,

[0107] The axial outer side two 24 of the axial stator two 2 is provided with a bearing stator air hole two 03', the bearing stator air hole two 03' penetrates from an axial one end face to an axial other end face of the axial outer side two 24, and the bearing stator air hole two 03' can communicate with the second thrust disc air inlet hole 02;

[0108] The motor rotor flow channel 25 communicates with the bearing stator air hole one 03 or the bearing stator air hole two 03'.

[0109] The application further enables the end face of the thrust disc to be not punched at the position directly opposite the magnetic pole position of the second axial stator by locating the second thrust disc air inlet hole at the axial position of the other end face of the thrust disc and not opposite the magnetic pole position of the second axial stator, so that the cooling air cannot directly reach the magnetic pole gap position of the second axial stator, and the influence of the cooling gas and the hole on the magnetic furnace structure can be further effectively avoided, the magnetic suspension axial supporting force can be further avoided, the heat dissipation and cooling of the magnetic suspension bearing can be further improved while the influence on the magnetic suspension magnetic circuit is avoided, the magnetic suspension supporting force is further improved, and the influence of the gas force on the axial force can be effectively reduced.

[0110] In some embodiments,

[0111] Inside the coil groove two 23, the fifth gap is formed between the radial inner side of the coil two 5' and the radial inner side two 22, forming a second gas flow path 08,

[0112] Inside the coil groove two 23, the sixth gap is also formed between the axial outer side two 24 and the coil two 5', forming a bearing stator ventilation groove two 04';

[0113] The bearing stator ventilation hole two 03' communicates with the bearing stator ventilation groove two 04', and further communicates with the second thrust disc air inlet hole 02 through the second gas flow path 08.

[0114] The application is provided with the bearing stator ventilation hole two on the axial outer side two, and the stator ventilation groove two and the gas flow path in the axial stator coil groove, which can form multiple gas flow paths from the thrust disc ventilation holes of the thrust disc on both sides to the middle thrust disc, further accelerate the gas flow in the axial stator coil groove cavity, and realize effective and independent heat dissipation of the axial coil and the thrust disc.

[0115] In some embodiments,

[0116] Further comprising a cover plate two 4', which is located between the axial stator two 2 and the thrust disc 3, and the axial one end face of the cover plate two 4' is connected with the radial outer side two 21 of the axial stator two 2, and the axial other end face of the cover plate two 4' is opposite to the thrust disc 3;

[0117] The pole position of the axial stator two 2 includes the part of the cover plate two 4' opposite to the thrust disc 3 and the part of the radially inner side two 22 opposite to the thrust disc 3, the fourth gap 07 is between the cover plate two 4' and the radially inner side two 22, the second thrust disc air inlet hole 02 is opposite to the fourth gap 07 in the axial direction, and the size of the fourth gap 07 in the radial direction is greater than or equal to the radial size of the second thrust disc air inlet hole 02.

[0118] The application also preferably sets the second thrust disc air inlet hole at the position opposite to the coil between the upper and lower poles of the axial stator two, and the size of the hole is less than or equal to the radial distance between the upper and lower poles of the axial stator two, so that the second thrust disc air inlet hole can effectively avoid the pole position, further avoid affecting the magnetic circuit, and the thrust disc air hole is connected to the ventilation path at both ends without obstruction, so that the air flow resistance at both ends of the thrust disc is small and the flowability is good; and the bearing stator ventilation hole two, the bearing stator ventilation groove two, the second gas flow path, the second gap and the second thrust disc air inlet hole are sequentially connected to form a gas flow channel.

[0119] In some embodiments,

[0120] In each radial section of the thrust disc 3, the magnetic circuit flow position cross-sectional area of the axial stator two 2 is equal to the radial cross-sectional area of the part of the thrust disc opposite to the axial stator two 2 minus the thrust disc air hole cross-sectional area minus the thrust disc air outlet hole 09 cross-sectional area, which is greater than or equal to the pole position cross-sectional area of the axial stator two 2.

[0121] The application further sets the thrust disc air hole at the position opposite to the coil between the upper and lower poles of the axial stator two, so that the size of the thrust disc air hole is less than or equal to the radial distance between the upper and lower poles of the axial stator two, which can effectively avoid the pole position of the axial stator two, further avoid affecting the magnetic circuit, and the thrust disc air hole is connected to the ventilation path at both ends without obstruction, so that the air flow resistance at both ends of the thrust disc is small and the flowability is good.

[0122] In some embodiments,

[0123] In the axial direction of the thrust disc 3, the second thrust disc air inlet hole 02 is a inclined hole structure whose extension direction is not parallel to the axis of the thrust disc 3, from the observation direction of the other end surface to the one end surface of the thrust disc 3 in the axial direction, the rotation direction of the thrust disc 3 is toward the third rotation direction, the extension direction of the second thrust disc air inlet hole 02 from the other end surface to the one end surface in the axial direction is toward the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0124] The application can also realize active ventilation and heat exchange of the thrust disc itself, accelerate the flow of gas, save energy consumption, improve the heat dissipation performance, and improve the energy efficiency by setting the second thrust disc air inlet hole to extend from the other axial end surface to the one axial end surface in the fourth rotation direction opposite to the third rotation direction (the rotation direction of the thrust disc) when the rotor drives the thrust disc to rotate at high speed to generate negative pressure to suck out the hot air from one end and discharge it to the outside, thereby increasing the flow of the gas entering.

[0125] In the direction from the one axial end surface to the other axial end surface, the first rotation direction is the third rotation direction, the fourth rotation direction is the same as the second rotation direction, and the first and second thrust disc air inlet holes and the thrust disc air outlet hole jointly form a Y-shaped inclined hole to intake air from both sides to the middle and discharge it through the thrust disc air outlet hole.

[0126] In order to facilitate negative pressure air intake, the air inlet hole is >90° to the rotation direction in the circumferential direction, and the air outlet hole is ≥90° to the rotation direction in the radial direction. The hole type is not required, and a circular hole, a rectangular circular hole or an elliptical hole is preferred for machining and process.

[0127] In some embodiments,

[0128] The second thrust disc air inlet hole 02 is a plurality of second thrust disc air inlet holes 02 arranged at intervals along the circumferential direction of the thrust disc 3, and each second thrust disc air inlet hole 02 extends from the other axial end surface to the one axial end surface in the fourth rotation direction opposite to the third rotation direction of the thrust disc 3.

[0129] In some embodiments,

[0130] The first thrust disc air inlet hole 01, the thrust disc air outlet hole 09 and the second thrust disc air inlet hole 02 correspond to each other to form a group of air outlet units, and the air outlet units are a plurality of groups of air outlet units arranged at intervals along the circumferential direction of the thrust disc 3.

[0131] The application can increase the flow area and flow rate of the airflow in the circumferential direction by the plurality of air outlet units to further improve the cooling and heat dissipation effect of the magnetic suspension bearing.

[0132] In some embodiments,

[0133] The axial width of the magnetic circuit flow area of the thrust disc 3 when satisfying magnetic saturation is minimum N, and the axial hole diameter of the thrust disc air outlet hole 09 is equal to the axial thickness of the thrust disc 3 minus N. The application preferably sets the axial width of the magnetic circuit flow area of the thrust disc to be minimum N when satisfying magnetic saturation, and the axial hole diameter of the air outlet is equal to the thickness of the thrust disc minus N, which can effectively ensure the maximum heat dissipation channel without affecting the axial magnetic circuit conduction.

[0134] In some embodiments,

[0135] The outer periphery of the axial stator one 1 and the axial stator two 2 is further provided with a cylinder body 6, and the position of the cylinder body 6 opposite to the thrust disc air outlet hole 09 of the thrust disc 3 is further provided with a bearing air outlet 26, which can be used for communication with the thrust disc air outlet hole 09 and exhaust air outward.

[0136] The bearing air outlet provided on the cylinder body at the outermost periphery is opposite to the thrust disc air outlet, can guide the gas discharged from the thrust disc air outlet hole, and the gas entering the first and second thrust disc air inlet holes from the two sides respectively is discharged from the bearing air outlet after cooling the coil, rotor and other structures of the magnetic suspension bearing, so that the smoothness of the gas flow is ensured, and the cooling effect is improved.

[0137] The axial magnetic bearing preferably adopts active ventilation cooling, the thrust disc is installed on the rotor, two inclined holes are punched to the middle from both sides of the position close to the inner ring of the part of the thrust disc opposite to the axial bearing ventilation groove, a through hole is further punched upward to the outer ring surface of the thrust disc, a plurality of Y-shaped inclined holes are arranged in the part of the thrust disc opposite to the axial bearing ventilation groove in the circumferential direction, the direction of the air inlet is opposite to the direction of rotation of the rotor, and when the thrust disc is driven to rotate at high speed by the rotor, negative pressure is generated to suck out hot air at one end and discharge it to the outside, so that the flow of the inlet gas is increased, the thrust disc is actively ventilated and heat exchanged, and the ventilation holes and the ventilation groove in the coil groove of the axial stator are matched to accelerate the gas flow in the cavity area of the axial bearing, so that the axial magnetic bearing is effectively and independently cooled.

[0138] According to the principle of the axial magnetic suspension bearing, the relative position of the thrust disc and the axial magnetic pole is the output position, that is, the end face of the thrust disc cannot be punched in the position opposite to the magnetic pole to avoid insufficient axial force, and the cooling air cannot directly reach the magnetic pole gap position to reduce the influence of the gas reaction force on the axial force, so the magnetic suspension bearing requires that the cooling hole cannot be opposite to the magnetic pole gap position. According to the axial magnetic circuit flow requirement, in order to ensure that the remaining positions will not be saturated with magnetic field earlier than the magnetic pole position, in the radial circumferential direction, the cross-sectional area of the magnetic circuit flowing position is greater than or equal to the cross-sectional area of the magnetic pole position. The air inlet is located at the position opposite to the coil between the upper and lower axial magnetic poles, and the hole diameter is less than or equal to the radial distance between the upper and lower magnetic poles of the axial stator. In each radial circumferential direction, the cross-sectional area of the magnetic circuit flowing position is equal to the radial circumferential cross-sectional area of the thrust disc minus the cross-sectional area of the hole in the same direction, which is greater than or equal to the cross-sectional area of the magnetic pole position. Preferably, when the thrust disc satisfies the magnetic saturation, the minimum axial width of the magnetic circuit flow area is N, and the axial hole diameter of the air outlet is equal to the thickness of the thrust disc minus N, so that the maximum heat dissipation channel is ensured without affecting the conduction of the axial magnetic circuit. In order to facilitate negative pressure air inlet, the direction of the air inlet hole is opposite to the direction of rotation, the air inlet hole is greater than 90 degrees in the circumferential direction with respect to the direction of rotation, and the air outlet hole is greater than or equal to 90 degrees in the radial direction with respect to the direction of rotation. There is no requirement for the hole type, and a circular hole, a rectangular circular hole or an elliptical hole is preferred for machining and process.

[0139] The whole system adopts a passive pure air cooling system, cold air is driven by a coaxial impeller at the other end of the main impeller or is rotated by a rotor to centrifugally intake air or to leak air into the main impeller, without an additional cooling driving motor, the cooling air flow is adjusted by the motor speed, without an additional controller, the internal flow channel layout guides the cold air to the components for targeted cooling, the whole cooling system is simple in structure and efficient and reliable in cooling process.

[0140] In some embodiments,

[0141] Further comprising a rear end cover 120, a cooling impeller 10 arranged at an axial end of the rotor 6 to rotate integrally with the rotor 6, the cooling impeller 10 is arranged inside the rear end cover 120, the center axis of the rear end cover 120 is provided with an axial first air inlet 121, the first air inlet 121 is opposite to the cooling impeller 10, the magnetic suspension bearing and the motor stator are located inside the cylinder 19;

[0142] The rear housing 130 is connected between the rear end cover 120 and the cylinder 19 in the axial direction, and the rear housing 130 is provided with a rear housing flow channel 220 in the axial direction, one end of the rear housing flow channel 220 can communicate with the motor rotor flow channel 25, and the other end of the rear housing flow channel 220 can communicate with the impeller air outlet 210 of the cooling impeller 10;

[0143] So that the airflow can pass through the first air inlet 121, the cooling impeller 10, the inside of the rear end cover 120 and the rear housing flow channel 220 in sequence and enter the motor rotor flow channel 25.

[0144] This is the structure of the magnetic suspension rotating machine of the present application located at the axial side of the magnetic suspension bearing, including the structure of the rear end cover, the rear housing, the rear radial bearing and the cooling impeller, which can absorb air from the first air inlet into the inside of the rear end cover through the cooling impeller rotating integrally with the rotor, and supply the motor rotor flow channel through the rear housing flow channel, and then supply the magnetic suspension bearing and the motor stator flow channel, which improves the airflow circulation path, increases the heat dissipation area of the motor stator and the rotor part and the magnetic suspension bearing, and improves the cooling performance.

[0145] In some embodiments,

[0146] Further comprising a front end cover 20, the front radial bearing 17 and the outer periphery of the rotor 6 have a front radial bearing flow channel, the front housing 18 and the outer periphery of the rotor 6 have a front housing first flow channel, the front end cover 20 is arranged on the axial side of the cylinder body 19 away from the rear end cover 120, the front housing 18 is arranged with a front housing third flow channel 37 at the outer periphery of the front radial bearing 17, the front housing first flow channel and the front housing third flow channel 37 can communicate with the bearing stator vent hole two 03', the outer periphery of the front housing third flow channel 37 on the front housing 18 is further arranged with a front housing second flow channel 36, the front housing second flow channel 36 extends in the axial direction and can communicate with the bearing air outlet 26;

[0147] The outer periphery of the front end cover 20 is arranged with a volute 31, the other end of the rotor 6 in the axial direction is arranged with a main impeller 30, the main impeller 30 is located in the volute 31, the center axis of the volute 31 is arranged with a second air inlet 311, the second air inlet 311 is opposite to the main impeller 30, the main impeller 30 and the front end cover 20 have a leakage passage 29, the front end cover 20 and the outer periphery of the rotor 6 have a front end cover flow channel,

[0148] So that the second air inlet 311, the main impeller 30, the leakage passage 29, the front end cover flow channel and the bearing stator vent hole one 03 of the magnetic suspension bearing are sequentially communicated, and then exhaust through the bearing air outlet 26;

[0149] The inner and outer circumferential walls of the cylinder body 19 are arranged with a motor air outlet 28, the motor air outlet 28 is opposite to and communicates with the motor stator flow channel 230; so that the motor rotor flow channel 25, the motor stator flow channel 230 and the motor air outlet 28 are sequentially communicated.

[0150] This is the structure of the magnetic suspension rotating machine of the present application located on the other side of the magnetic suspension bearing, including the structure of the main impeller, the front end cover, the front housing, the front radial bearing and the like, which can heat exchange the gas sucked by the main impeller, the front radial bearing and the magnetic suspension bearing, the gas entering through the second air inlet is heated exchanged with the gas entering the magnetic bearing through a part of the motor rotor flow channel after being heated exchanged with the magnetic bearing, and then is combined and discharged from the bearing air outlet, thereby forming a flow path for heat dissipation of the magnetic bearing and the motor in multiple ways, which can further improve the cooling performance of the magnetic suspension machine; and the front housing third flow channel arranged at the front housing can cool and dissipate heat for the outer periphery of the front radial bearing, and the front housing second flow channel can cool and dissipate heat for the front housing.

[0151] Figure 4The cooling channel path scheme of the magnetic suspension rotating machine of the application (preferably a blower) is shown, which adopts an active pure air cooling heat dissipation system, cold air is provided by the leakage of the cooling impeller and the main impeller, without the need for an additional heat dissipation driving motor, the main impeller 30 is assembled at the front end of the rotor, the cooling impeller 10 is assembled at the rear end of the rotor, the rear radial bearing 14 is located between the cooling impeller 10 and the motor stator 15, the front radial bearing 17 and the axial bearing are located between the main impeller 30 and the motor stator 15 respectively, the protection bearing 34 is located between the main impeller 30 and the front end cover 20, the rear shell is provided with a guide plate 11 for guiding the cooling impeller and a rear end cover 12 to increase the air flow conduction and reduce the flow resistance, and a plurality of corresponding air vents or air grooves are formed on the rear shell 13, the cylinder body 19, the front shell 18, the radial bearing, the axial bearing and other parts to facilitate air flow conduction, the cooling gas is dissipated in four ways, the first way: first, cool the rear radial bearing 14, then cool the rotor 6 and the motor stator 15 through the motor rotor flow channel 25, and finally cool the motor stator again through the motor stator flow channel 230, and then discharge from the motor air outlet 28; the second way: first, cool the rear radial bearing 14, then cool the rotor 6 and the motor stator 15 through the motor rotor flow channel 25, then cool the front shell assembly through the front shell second flow channel 36 on the front shell 18, and finally discharge through the bearing air outlet 26; the third way: first, cool the rear radial bearing 14, then cool the motor rotor and the stator through the rotor flow channel 25, cool the front radial bearing 17 through the gap between the front radial bearing 17 and the rotor 6 and the front shell third flow channel 37, then cool the axial bearing and the thrust disc 3 through the bearing stator air vent 203' and the thrust disc Y-shaped inclined hole, and finally discharge from the bearing air outlet 26 on the cylinder body 19; the fourth way: the leakage gas of the main impeller 30 passes through the rear leakage flow channel 29 and the flow channel four 33, then passes through the protection bearing 34 to cool the protection bearing, then passes through the flow channel five 35, the bearing stator air vent 103 and the thrust disc Y-shaped inclined hole to cool the axial bearing and the thrust disc 3, and finally discharges from the bearing air outlet 26 on the cylinder body 19. This flow channel structure arrangement utilizes the leakage and cooling air flow of the main impeller to effectively cool the motor stator, rotor, radial bearing, axial bearing, protection bearing and other heat generating components, and Y-shaped inclined holes are arranged on the high heat generating component thrust disc to utilize negative pressure to suck out hot air through the Y-shaped inclined hole flow channel, thereby realizing effective ventilation cooling of the whole blower heat generating component, the whole heat dissipation system structure is simple, the heat dissipation process is efficient and reliable, and the stability of the magnetic suspension system is improved.

[0152] The beneficial effects of the application are as follows:

[0153] 1. The application sets Y-shaped inclined holes on the thrust disc for high heat generating components, utilizes negative pressure to suck out heat through the Y-shaped inclined hole flow channel, and makes inclined holes on both sides of the two magnetic poles of the thrust disc to the middle, then makes inclined holes upward to the outer ring surface of the thrust disc, the inner ring surface of the axial stator is provided with air inlets matched with the Y-shaped holes of the thrust disc, which can actively cool and accelerate the heat dissipation, increase the cooling flow and not affect the axial magnetic circuit.

[0154] 2. The application provides a one-piece high-efficiency pure air cooling system, which is a positive pure air cooling system and can effectively accelerate cooling and improve reliability by targeted ventilation of heat generating parts, can ensure that the magnetic suspension rotating machine has sufficient cooling air volume under various working conditions, and has simple control logic and high reliability of the cooling system.

[0155] The application also provides a magnetic suspension rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator or a compressor), which comprises the magnetic suspension bearing.

[0156] Figure 1 The axial bearing cooling path of the magnetic suspension rotating machine (preferably a blower) of the application is shown, the first thrust disc air inlet hole 01 (an inclined hole), the second thrust disc air inlet hole 02 (an inclined hole) and the thrust disc air outlet hole 09 (an inclined hole) form a Y-shaped inclined hole of the thrust disc, the air inlet of the Y-shaped hole of the thrust disc is located opposite the coil between the axial inner and outer magnetic poles, and corresponds to the ventilation position of the slot. Ventilation grooves and ventilation holes are formed in the axial stator, the ventilation holes are connected to the ventilation grooves, and the ventilation grooves (the first and second gas flow paths) are radially, annularly or helically arranged, etc. The cooling path is: cooling gas passes through the bearing stator ventilation hole one 03 (the bearing stator ventilation hole two 03') → the bearing stator ventilation groove one 04 (the bearing stator ventilation groove two 04') → the first gas flow path 06 (the second gas flow path 08) → the first gap 05 (the fourth gap 07), and is collected 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 09 for exhaust, thereby effectively cooling the axial stator and the axial winding. During operation, the air inlet direction of the first and thrust disc air inlet inclined holes is opposite to the rotation direction of the rotor, and the gas in the ventilation groove is sucked into the thrust disc inclined hole and then discharged for heat dissipation by using negative pressure. This kind of cooling path can achieve effective and autonomous heat dissipation effect. In order to make the thrust disc have negative pressure air inlet, the air inlet direction needs to be always opposite to the rotation direction of the rotor, so the rotation direction of the thrust disc inclined hole is related to the air inlet direction of the thrust disc and the rotation direction of the rotor. If the air inlet direction of the left end of the thrust disc is clockwise rotation from the right end, the thrust disc is a right-handed inclined hole. If the air inlet direction of the left end of the thrust disc is counterclockwise rotation from the right end, the thrust disc is a left-handed inclined hole. Conversely, the same applies. If the directions do not match, the heat dissipation effect is weakened and the heat dissipation efficiency is reduced.

[0157] The above description is only the preferred embodiment of the application and is not intended to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application. The above description is only the preferred embodiment of the application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the application, a number of improvements and modifications can be made, which should be regarded as the protection scope of the application.

Claims

1. A magnetic bearing rotary machine characterized by: The application relates to a magnetic suspension bearing, a motor stator (15) and a rotor (6), the motor stator (15) is located at the radial outer periphery of a partial shaft section of the rotor (6), a motor stator flow channel (230) is formed on the motor stator in the axial direction, a rotor air gap exists between the rotor (6) and the motor stator to form a motor rotor flow channel (25), the motor stator flow channel (230) and the motor rotor flow channel (25) can flow gas, and the magnetic suspension bearing is located at one side of the motor stator in the axial direction and can support the rotor (6). The magnetic suspension bearing comprises an axial stator one (1), an axial stator two (2) and a thrust disc (3), the thrust disc (3) is arranged between the axial stator one (1) and the axial stator two (2) in the axial direction of the magnetic suspension bearing, a thrust disc ventilation hole is formed through the thrust disc (3) from one axial end surface to the other axial end surface, the axial stator one (1) comprises a radial outer side one (11) and a radial inner side one (12), the radial outer side one (11) and the radial inner side one (12) are arranged in the radial direction of the axial stator one (1) and are spaced apart from each other, and a coil groove one (13) is formed between the radial outer side one (11) and the radial inner side one (12), and a coil one (5) is arranged in the coil groove one (13). The thrust disc ventilation hole comprises a first thrust disc air inlet hole (01) extending from one axial end surface of the thrust disc (3) to the inside of the thrust disc (3) and a second thrust disc air inlet hole (02) extending from the other axial end surface of the thrust disc (3) to the inside of the thrust disc (3), one end of the first thrust disc air inlet hole (01) in the inside of the thrust disc (3) is communicated with one end of the second thrust disc air inlet hole (02) in the inside of the thrust disc (3), and the communication is communicated to the outer periphery of the thrust disc (3) through a thrust disc air outlet hole (09), one end of the first thrust disc air inlet hole (01) at the one axial end surface of the thrust disc (3) is opposite to the position of the coil groove one (13) in the axial direction, and the one end of the first thrust disc air inlet hole (01) is not opposite to the position of the magnetic pole of the axial stator one (1). The axial stator one (1) further comprises an axial outer side one (14), the axial outer side one (14) is arranged away from the thrust disc (3) relative to the coil one (5) in the axial direction of the magnetic suspension bearing, The axial outer side one (14) of the axial stator one (1) is provided with a bearing stator ventilation hole one (03) penetrating from one axial end surface to the other axial end surface of the axial outer side one (14), the bearing stator ventilation hole one (03) can be communicated with the first thrust disc air inlet hole (01), and the motor rotor flow channel (25) can be communicated with the bearing stator ventilation hole one (03) and the motor stator flow channel (230) respectively. ​ Further comprising a front radial bearing (17) located between the magnetic bearing and the motor stator, and a front housing (18) located at the outer periphery of the front radial bearing (17).

2. The magnetic levitation rotating machine according to claim 1, wherein: Inside the coil slot one (13), a second gap is formed between the radial inner side of the coil one (5) and the radial inner side one (12), forming a first gas flow path (06), Inside the coil slot one (13), a third gap is also formed between the axial outer side one (14) and the coil one (5), forming a bearing stator vent slot one (04); The bearing stator vent hole one (03) is in communication with the bearing stator vent slot one (04), and further in communication with the first thrust disc air inlet hole (01) through the first gas flow path (06).

3. The magnetic levitation rotating machine according to claim 1, wherein: Further comprising a cover plate one (4) located between the axial stator one (1) and the thrust disc (3), and an axial one end surface of the cover plate one (4) is in contact with the radial outer side one (11) of the axial stator one (1), and an axial other end surface of the cover plate one (4) is opposite to the thrust disc (3); The magnetic pole position of the axial stator one (1) includes a portion opposite to the thrust disc (3) and a portion opposite to the radial inner side one (12), and a first gap (05) is formed between the cover plate one (4) and the radial inner side one (12), the first thrust disc air inlet hole (01) is opposite to the first gap (05) in the axial direction, and the radial dimension of the first gap (05) is greater than or equal to the radial dimension of the first thrust disc air inlet hole (01).

4. The magnetic levitation rotating machine according to claim 3, wherein: In any radial cross section of the thrust disc (3), the cross-sectional area of the magnetic circuit flow position of the axial stator one (1) is equal to the radial cross-sectional area of the portion opposite to the thrust disc (3) minus the cross-sectional area of the thrust disc air inlet hole (09) minus the cross-sectional area of the thrust disc air outlet hole (09), which is greater than or equal to the cross-sectional area of the magnetic pole position of the axial stator one (1).

5. The magnetic levitation rotating machine according to claim 1, wherein: In the axial direction of the thrust disc (3), the first thrust disc air inlet hole (01) is a slanted hole structure whose extension direction is not parallel to the axis of the thrust disc (3), and from the observation direction of the axial one end surface to the axial other end surface of the thrust disc (3), the rotation direction of the thrust disc (3) is towards the first rotation direction, the extension direction of the first thrust disc air inlet hole (01) from the axial one end surface to the axial other end surface is towards 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, wherein: The first thrust disc air inlet hole (01) is multiple, multiple first thrust disc air inlet holes (01) are arranged along the circumferential direction of the thrust disc (3), and the extension direction of each first thrust disc air inlet hole (01) from one axial end surface to the other axial end surface is towards the second rotation direction, opposite to the first rotation direction of the thrust disc (3).

7. The magnetic bearing rotating machine of claim 1, wherein: The axial stator two (2) includes a radial outer side two (21) and a radial inner side two (22), the radial outer side two (21) and the radial inner side two (22) are arranged in the radial direction of the axial stator two (2), and a coil slot two (23) is formed therebetween, the coil slot two (23) is provided with a coil two (5'), the second thrust disc air inlet hole (02) is located at one end of the other axial end surface of the thrust disc (3) in the axial direction, opposite to the position of the coil slot two (23), and the one end of the second thrust disc air inlet hole (02) is not opposite to the magnetic pole position of the axial stator two (2); The axial stator two (2) further includes an axial outer side two (24), which is arranged away from the thrust disc (3) relative to the coil two (5') in the axial direction of the magnetic bearing, The axial outer side two (24) of the axial stator two (2) is provided with a bearing stator air hole two (03'), which penetrates from one axial end surface to the other axial end surface of the axial outer side two (24), and the bearing stator air hole two (03') can communicate with the second thrust disc air inlet hole (02); The motor rotor flow channel (25) communicates with the bearing stator air hole one (03) or the bearing stator air hole two (03').

8. The magnetic bearing rotating machine of claim 7, wherein: Inside the coil slot two (23), there is a fifth gap between the radial inner side of the coil two (5') and the radial inner side two (22), forming a second gas flow path (08), Inside the coil slot two (23), there is also a sixth gap between the axial outer side two (24) and the coil two (5'), forming a bearing stator air slot two (04'); The bearing stator air hole two (03') communicates with the bearing stator air slot two (04'), and further communicates to the second thrust disc air inlet hole (02) through the second gas flow path (08).

9. The magnetic bearing rotating machine of claim 7, wherein: Further comprising a cover plate two (4'), which is located between the axial stator two (2) and the thrust disc (3), and the axial one end surface of the cover plate two (4') is connected with the radial outer side two (21) of the axial stator two (2), and the other axial end surface of the cover plate two (4') is opposite to the thrust disc (3). The pole position of the axial stator two (2) includes the part of the cover plate two (4') opposite to the thrust disc (3) and the part of the radial inner side two (22) opposite to the thrust disc (3), the fourth gap (07) is provided between the cover plate two (4') and the radial inner side two (22), the second thrust disc air inlet hole (02) is opposite to the fourth gap (07) in the axial direction, and the radial direction size of the fourth gap (07) is greater than or equal to the radial size of the second thrust disc air inlet hole (02).

10. The magnetic suspension rotating machine according to claim 9, characterized in that: In each radial section of the thrust disc (3), the magnetic circuit of the axial stator two (2) flows through a position cross-sectional area = the radial cross-sectional area of the part of the thrust disc opposite to the axial stator two (2) - the thrust disc air inlet hole cross-sectional area - the thrust disc air outlet hole (09) cross-sectional area ≥ the pole position cross-sectional area of the axial stator two (2).

11. The magnetic suspension rotating machine according to any one of claims 1-10, characterized in that: Along the axial direction of the thrust disc (3), the second thrust disc air inlet hole (02) is a slant hole structure whose extension direction is not parallel to the axis of the thrust disc (3), from the observation direction of the axial other end surface of the thrust disc (3) to the axial one end surface, the rotation direction of the thrust disc (3) is toward the third rotation direction, the extension direction of the second thrust disc air inlet hole (02) from the axial other end surface to the axial one end surface is toward the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

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

13. The magnetic suspension rotating machine according to claim 12, characterized in that: The first thrust disc air inlet hole (01), the thrust disc air outlet hole (09) and the second thrust disc air inlet hole (02) correspond one by one to form a group of air outlet units, and the air outlet units are a plurality of groups arranged at intervals along the circumferential direction of the thrust disc (3).

14. The magnetic suspension rotating machine according to any one of claims 1-13, characterized in that: The axial width of the magnetic circuit flow area of the thrust disc (3) when satisfying the magnetic saturation is N at least, and the axial hole diameter of the thrust disc air outlet hole (09) = the axial thickness of the thrust disc (3) - N.

15. The magnetic suspension rotating machine according to claim 7, characterized in that: The outer periphery of the axial stator one (1) and the axial stator two (2) further has a cylinder body (19), and a bearing air outlet (26) is further arranged at a position of the cylinder body (19) opposite to the thrust disc air outlet hole (09) of the thrust disc (3), which can be used for being communicated with the thrust disc air outlet hole (09) and exhausting air outward.

16. The magnetic bearing rotary machine of claim 15, wherein: Further comprising a rear end cover (120), a cooling impeller (10), a rear shell (130) and a rear radial bearing (140), the cooling impeller (10) is arranged at an axial end of the rotor (6) and can rotate integrally with the rotor (6), the cooling impeller (10) is arranged inside the rear end cover (120), a first air inlet (121) is arranged at a central axis of the rear end cover (120) and penetrates axially, and the first air inlet (121) is opposite to the cooling impeller (10), the magnetic bearing and the motor stator are located inside the cylinder body (19); The rear shell (130) is connected between the rear end cover (120) and the cylinder body (19) in the axial direction, and a rear shell flow channel (220) is arranged on the rear shell (130) in the axial direction, one end of the rear shell flow channel (220) can be communicated with the motor rotor flow channel (25), and the other end of the rear shell flow channel (220) can be communicated with an impeller air outlet (210) of the cooling impeller (10); So that the air flow can pass through the first air inlet (121), the cooling impeller (10), the inside of the rear end cover (120) and the rear shell flow channel (220) in sequence and enter the motor rotor flow channel (25).

17. The magnetic bearing rotary machine of claim 16, wherein: Further comprising a front end cover (20), the front radial bearing (17) and the outer periphery of the rotor (6) have a front radial bearing flow channel, the front shell (18) and the outer periphery of the rotor (6) have a front shell first flow channel, the front end cover (20) is arranged at an axial side of the cylinder body (19) away from the rear end cover (120), the front shell (18) is provided with a front shell third flow channel (37) at the outer periphery of the front radial bearing (17), the front shell first flow channel and the front shell third flow channel (37) can be communicated with the bearing stator air hole two (03'), the front shell (18) is further provided with a front shell second flow channel (36) at the outer periphery of the front shell third flow channel (37), the front shell second flow channel (36) extends in the axial direction and can be communicated with the bearing air outlet (26); The outer periphery of the front end cover (20) is provided with a volute (31), the axial other end of the rotor (6) is provided with a main impeller (30), the main impeller (30) is located in the volute (31), the central axis position of the volute (31) is provided with a second air inlet (311), the second air inlet (311) is opposite to the main impeller (30), the main impeller (30) and the front end cover (20) have a leakage channel (29), the front end cover (20) and the outer periphery of the rotor (6) have a front end cover flow channel, So that the second air inlet (311), the main impeller (30), the leakage channel (29), the front end cover flow channel and the bearing stator vent hole (03) of the magnetic suspension bearing are communicated in turn, and then exhaust through the bearing air outlet (26); The inner and outer peripheral walls of the cylinder (19) are provided with a motor air outlet (28) penetratingly, the motor air outlet (28) is opposite to and communicated with the motor stator flow channel (230); so that the motor rotor flow channel (25), the motor stator flow channel (230) and the motor air outlet (28) are communicated in turn.

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