An air-suspended high-speed centrifugal fan with a hybrid bearing structure

Abstract

The present invention discloses an air-suspended high-speed centrifugal fan with a hybrid bearing structure, which relates to the technical field of energy-saving centrifugal fans and comprises a motor part and an impeller part, wherein the motor part comprises a motor housing, a motor stator arranged in the motor housing and a motor shaft matched with the motor stator, the side surface of the motor shaft is sequentially provided with a motor rotor, a magnetic suspension rotor and a rotating part along the axial direction, and the inside of the motor housing is provided with a magnetic suspension electromagnet and a foil bearing at positions corresponding to the magnetic suspension rotor and the rotating part, wherein a bearing foil is arranged between the foil bearing and the rotating part, and the bearing foil controls the starting circuit of the magnetic suspension electromagnet based on the deformation generated by air pressure; during the start-stop stage of the motor rotor, the motor rotor, the magnetic suspension rotor and the rotating part on the motor shaft will not have sliding friction, thereby ensuring that no mechanical friction will occur between the motor shaft and the bearing foil, thereby greatly increasing the stability and service life of the motor shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving centrifugal fans, and in particular to an air-suspended high-speed centrifugal fan with a hybrid bearing structure. Background Art

[0002] Air suspension high-speed centrifugal fan, also known as air suspension centrifugal blower, is a new concept blower. It uses air suspension bearings, which have the advantages of high efficiency, high performance, low noise and low energy consumption. The air suspension bearing will contact the shaft before starting. However, after starting, the fluid dynamic field formed by the movement of the shaft will form radial buoyancy in the bearing, that is, air film. When the shaft is running, there is no physical contact point between the shaft and the bearing, no lubricating oil is required, energy loss is extremely low, and efficiency is extremely high.

[0003] Existing air-suspended high-speed centrifugal fans, such as an air-suspended high-speed centrifugal fan with a hybrid bearing structure disclosed in Chinese patent application publication number CN115822989A and an air-suspended centrifugal blower disclosed in Chinese patent publication number CN104179712A, use air-suspended bearings. When the impeller of such air-suspended high-speed centrifugal fans is rotating at a low speed during startup or shutdown, the air entering the air-suspended bearings may be insufficient to support the rotating shaft. As a result, the rotating shaft may violently mechanically collide with the inner surface of the air-suspended bearings, which may easily cause mechanical fatigue of the air-suspended bearings and the rotating shaft. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide an air-suspended high-speed centrifugal fan with a hybrid bearing structure, so as to solve the problem in the prior art that when the impeller is rotating at a low speed, the amount of air entering the air-suspended bearing is very limited, so that the air pressure generated by the air-suspended bearing is insufficient to support the rotation of the rotating shaft at the central axis position of the air-suspended bearing, so that the rotating shaft will rotate eccentrically, and the rotating shaft will produce a violent mechanical collision with the inner surface of the air-suspended bearing, resulting in the problem of mechanical fatigue of the air-suspended bearing and the rotating shaft.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] Specifically, an air-suspended high-speed centrifugal fan with a hybrid bearing structure is provided, which includes a motor part and an impeller part, wherein the motor part includes a motor housing, a motor stator arranged in the motor housing, and a motor shaft cooperating with the motor stator, and the side of the motor shaft is sequentially provided with a motor rotor, a magnetic suspension rotor and a rotating part along the axial direction, and the inside of the motor housing is provided with a magnetic suspension electromagnet and a foil bearing at positions corresponding to the magnetic suspension rotor and the rotating part, respectively, wherein a bearing foil is arranged between the foil bearing and the rotating part, and the bearing foil controls the starting circuit of the magnetic suspension electromagnet based on the deformation generated by air pressure.

[0007] As a further solution of the present invention: the bearing foil includes a cylindrical extruded foil surface, a plurality of arc-shaped elastic foil surfaces are distributed on the outside of the cylindrical extruded foil surface, a docking portion is connected between the plurality of arc-shaped elastic foil surfaces, one end of the cylindrical extruded foil surface is fixedly connected to a fixed end portion, the fixed end portion is fixedly connected to the inner side surface of the foil bearing, docking terminals are respectively provided at both ends of the cylindrical extruded foil surface, and a starting circuit of the magnetic levitation electromagnet is connected in series with the docking terminal.

[0008] As a further solution of the present invention, when the butt terminals at both ends of the cylindrical extruded foil surface are in contact, the diameter of the closed circular ring formed by the cylindrical extruded foil surface exceeds the maximum diameter of the rotating part by 4 to 10 microns.

[0009] As a further solution of the present invention: the docking terminal includes a fixed arc-shaped conductor portion and a movable arc-shaped conductor portion.

[0010] As a further solution of the present invention: a first time-delayed joint portion and a second time-delayed joint portion are provided at the middle positions of both ends of the cylindrical extruded foil surface.

[0011] As a further solution of the present invention: the first time-delay combining part is a first combining magnet, the second time-delay combining part is a second combining magnet, and the polarities of the facing surfaces of the first combining magnet and the second combining magnet are opposite.

[0012] As a further solution of the present invention: the first time-delayed binding portion is a first binding card, and the second time-delayed binding portion is a second binding card, wherein the first binding card is provided with a plurality of first protrusions, and a first recessed portion is provided between the plurality of first protrusions; the second binding card is provided with a plurality of second protrusions, and a second recessed portion is provided between the plurality of second protrusions;

[0013] The first protrusions correspond to and match the second recesses in a one-to-one manner, and the second protrusions correspond to and match the first recesses in a one-to-one manner.

[0014] As a further solution of the present invention: a first receiving portion is formed at an end portion of the first protruding portion, and a second receiving portion is formed at an end portion of the second protruding portion.

[0015] As a further solution of the present invention: the first protrusion and the second protrusion are both made of memory metal, and the phase change temperature of the memory metal is above 150 degrees Celsius.

[0016] As a further solution of the present invention: the first delayed joint is a first wind pressure card, and the second delayed joint is a second wind pressure card, wherein the top surface of the first wind pressure card is provided with a first wedge-shaped air guide groove, and the top surface of the second wind pressure card is provided with a second wedge-shaped air guide groove.

[0017] Beneficial effects of the present invention:

[0018] In the present invention, a magnetic levitation electromagnet and a bearing foil are provided, and the deformation of the bearing foil based on the air pressure controls the starting circuit of the magnetic levitation electromagnet. Due to the deformation of the bearing foil, the contact portion on the bearing foil will separate, which will automatically disconnect the starting circuit of the magnetic levitation electromagnet, that is, automatically shut down the magnetic levitation electromagnet. However, since the gas forms a stable air film between the rotating part and the bearing foil at this time, and stably supports the rotating part to rotate inside the bearing foil through the wedge effect, even if the magnetic levitation electromagnet is automatically shut down and no longer provides support force for the magnetic levitation rotor, the motor rotor can still maintain stable rotation driven by the rotating part. Since the motor rotor, the magnetic levitation rotor and the rotating part on the motor shaft will not have sliding friction during the start and stop stages of the motor rotor, it is ensured that no mechanical friction will occur between the motor shaft and the bearing foil, thereby greatly increasing the stability and service life of the motor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a structural diagram of an air-suspended high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of an air-suspended high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of a motor stator in an air-suspended high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0023] Figure 4 This is a schematic structural diagram of a motor shaft in an air-suspended high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0024] Figure 5 This is a schematic structural diagram of a foil bearing in an air-suspended high-speed centrifugal fan of a hybrid bearing structure according to the present invention;

[0025] Figure 6This is a front view of a bearing foil in an air-suspended high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0026] Figure 7 yes Figure 6 A partial enlarged view of the unfolded bearing foil at point A in the middle;

[0027] Figure 8 yes Figure 6 A partial enlarged view of the bearing foil closure at point A;

[0028] Figure 9 This is a schematic diagram of the partial structure of a bearing foil in an air-suspended high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0029] Figure 10 This is a front view of a first combined magnet and a second combined magnet in an air suspension high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0030] Figure 11 This is a front view of a first coupling card and a second coupling card in an air suspension high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0031] Figure 12 This is an expanded front view of a first coupling card and a second coupling card in an air suspension high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0032] Figure 13 This is a front view of a first wind pressure card and a second wind pressure card in an air suspension high-speed centrifugal fan with a hybrid bearing structure according to the present invention;

[0033] Figure 14 The present invention is a schematic structural diagram of a motor housing in an air-suspended high-speed centrifugal fan with a hybrid bearing structure.

[0034] Explanation of the reference numerals: 1. motor housing; 11. motor stator; 12. motor shaft; 13. magnetic levitation electromagnet; 14. foil bearing; 15. motor rotor; 16. magnetic levitation rotor; 17. rotating member; 18. bearing foil; 181. cylindrical extruded foil surface; 182. arc-shaped elastic foil surface; 183. docking portion; 184. fixed end portion; 185. fixed arc-shaped conductor portion; 186. movable arc-shaped conductor portion; 187. first time-delay coupling portion; 188. second time-delay coupling portion; 187a. first coupling magnet; 188a. second coupling magnet; 187b. first coupling card ;188b, second combining card;187b1, first protrusion;187b2, first recessed portion;187b3, first receiving portion;188b1, second protrusion;188b2, second recessed portion;188b3, second receiving portion;187c, first wind pressure card;187c1, first wedge-shaped air guide groove;188c, second wind pressure card;188c1, second wedge-shaped air guide groove;2, motor base;3, first air inlet channel;31, first impeller;4, second air inlet channel;41, second impeller;5, first air outlet channel;6, second air outlet channel;61, docking channel. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] As an embodiment of the present invention, Figures 1-9As shown, an air suspension high-speed centrifugal fan with a hybrid bearing structure is disclosed, including a motor part and an impeller part, wherein the motor part includes a motor housing 1, a motor stator 11 arranged in the motor housing 1, and a motor shaft 12 matched with the motor stator 11. The bottom surface of the motor housing 1 is connected to the motor base 2 by bolts. The motor base 2 is used to support the motor housing 1. The side of the motor shaft 12 is sequentially provided with a motor rotor 15, a magnetic suspension rotor 16 and a rotating member 17 along the axial direction. The inside of the motor housing 1 is provided with magnetic suspension electromagnetic rotors 16 and rotating member 17 at positions corresponding to the magnetic suspension rotor 16 and the rotating member 17. The rotor 17 includes a rotor 13 and a foil bearing 14, wherein a bearing foil 18 is provided between the foil bearing 14 and the rotating member 17. The bearing foil 18 controls the starting circuit of the magnetic levitation electromagnet 13 based on the deformation generated by the air pressure. It should be noted that when the motor portion and the impeller portion are not connected to an external power source, the motor stator 11 and the magnetic levitation electromagnet 13 are both in a power-off state, and therefore, neither generates magnetic force. At this time, the motor shaft 12 is stationary between the motor stator 11 and the magnetic levitation electromagnet 13. When the motor portion and the impeller portion are connected to an external power source, the air-suspended high-speed centrifugal fan operates in the following manner:

[0037] First, before the motor and impeller are connected to an external power source, no external air enters the motor, and therefore no gas pressure is generated between the rotating member 17 and the bearing foil 18. From the end of the bearing foil 18, the bearing foil 18 forms a complete ring under the action of its own elastic force. The starting circuit of the magnetic levitation electromagnet 13 passes through the bearing foil 18. Therefore, when the bearing foil 18 is in a complete ring, the bearing foil 18 can close the starting circuit of the magnetic levitation electromagnet 13. When the motor is connected to an external power source, the electrical energy of the external power source can be transmitted to the magnetic levitation electromagnet 13 through the closed starting circuit, causing the magnetic levitation electromagnet 13 to generate magnetic force and operate normally.

[0038] When the magnetic levitation electromagnet 13 generates magnetic force, it cooperates with the magnetic levitation rotor 16 on the side of the motor shaft 12, generating a repulsive force between the magnetic levitation electromagnet 13 and the magnetic levitation rotor 16. That is, the magnetic poles of the outer surface of the magnetic levitation rotor 16 and the inner surface of the magnetic levitation electromagnet 13 are the same. In this way, the magnetic levitation rotor 16 is repelled by the magnetic force generated by the magnetic levitation electromagnet 13, causing the magnetic levitation rotor 16 to float in the middle of the inner side of the magnetic levitation electromagnet 13. Since the magnetic levitation rotor 16 is fixedly embedded in the side of the motor shaft 12, it also causes the motor shaft 12 to float, ensuring that the rotating member 17 is out of contact with the bearing foil 18.

[0039] Since the magnetic levitation electromagnet 13 generates magnetic force synchronously with the motor stator 11, the suspended motor shaft 12 rotates under the action of the magnetic field of the motor stator 11. The rotating motor rotor 15 drives the rotating member 17 to rotate synchronously. At this time, the rotating member 17 is out of contact with the bearing foil 18. Therefore, when the motor shaft 12 is just started, no sliding friction occurs between the rotating member 17 and the bearing foil 18.

[0040] Both ends of the motor shaft 12 are connected to the impeller part, which includes a first air inlet channel 3 and a second air inlet channel 4, wherein the first air inlet channel 3 is provided with a first impeller 31 that fits with the first air inlet channel 3, and the second air inlet channel 4 is provided with a second impeller 41 that fits with the second air inlet channel 4. A first air outlet channel 5 is opened on the side of the first air inlet channel 3. When the first impeller 31 inside the first air inlet channel 3 rotates at a high speed, the air entering the first air inlet channel 3 can be discharged from the first air outlet channel 5 by centrifugal force, as shown in FIG. Figure 14 As shown, a docking channel 61 is provided on the inner side of the motor housing 1 near the gap between the foil bearing 14 and the first impeller 31. The motor housing 1 is also fixedly connected to a second air outlet channel 6 connected to the docking channel 61. The air output by the foil bearing 14 can be discharged into the second air outlet channel 6 through the docking channel 61 and then discharged from the second air outlet channel 6. The two ends of the motor shaft 12 are respectively fixedly connected to the first impeller 31 and the second impeller 41. The first impeller 31 is the main impeller of the air suspension high-speed centrifugal fan. The second impeller 41 provides flowing gas to the interior of the air suspension high-speed centrifugal fan. Therefore, when the motor shaft 12 rotates, the motor shaft 12 will drive the second impeller 41 to rotate synchronously. The rotating second impeller 41 will suck the external air into the interior of the motor housing 1 through the second air inlet channel 4, and then pass through the gap between the motor stator 11 and the motor rotor 15, the gap between the magnetic suspension electromagnet 13 and the magnetic suspension rotor 16, and reach the gap between the rotating member 17 and the bearing foil 18;

[0041] It should be emphasized that, when the motor shaft 12 is just started, the gas sucked into the motor housing 1 from the second air inlet channel 4 is very limited, so the gas entering the gap between the rotating member 17 and the bearing foil 18 is also very limited. At this time, due to the small amount of gas flow, the gas cannot form a stable air film between the rotating member 17 and the bearing foil 18, and is therefore insufficient to support the rotation of the rotating member 17. When the speed of the motor shaft 12 increases, the amount of gas sucked into the motor housing 1 from the second air inlet channel 4 increases, so the gas entering the gap between the rotating member 17 and the bearing foil 18 also increases. Due to the wedge effect, the gas between the rotating member 17 and the bearing foil 18 will generate sufficient air pressure to make the rotating member 17 rotate stably inside the bearing foil 18. The air pressure will also act on the bearing foil 18, causing the bearing foil 18 to deform.

[0042] Since the bearing foil 18 is deformed, the contact portion on the bearing foil 18 will separate, which will automatically disconnect the starting circuit of the magnetic levitation electromagnet 13, that is, automatically shut down the magnetic levitation electromagnet 13. However, since the gas forms a stable gas film between the rotating part 17 and the bearing foil 18 at this time, and the wedge effect is used to support the rotating part 17 to stably rotate inside the bearing foil 18, even if the magnetic levitation electromagnet 13 is automatically shut down and no longer provides support for the magnetic levitation rotor 16, the motor rotor 15 can still maintain stable rotation driven by the rotating part 17. Moreover, since no sliding friction occurs between the motor rotor 15, the magnetic levitation rotor 16 and the rotating part 17 on the motor shaft 12 during the entire operation process of the motor rotor 15 (including the start and stop stages), it is ensured that no mechanical friction occurs between the motor shaft 12 and the bearing foil 18, thereby greatly increasing the stability and service life of the motor shaft 12.

[0043] In particular, when the speed of the motor shaft 12 of the air suspension high-speed centrifugal fan becomes unstable due to objective factors, the amount of gas entering the motor housing 1 through the second air inlet channel 4 is also unstable due to the unstable speed of the motor shaft 12, thereby destroying the air film formed by the gas between the rotating part 17 and the bearing foil 18. In this way, the air pressure between the rotating part 17 and the bearing foil 18 is insufficient to support the rotating part 17, and the bearing foil 18 will automatically shrink due to its own elastic force, that is, it will re-form a complete ring, and the magnetic suspension electromagnetic The starting circuit of the magnetic levitation electromagnet 13 passes through the bearing foil 18. Therefore, when the bearing foil 18 is in a complete circular state, the bearing foil 18 can reclose the starting circuit of the magnetic levitation electromagnet 13, so that the magnetic levitation electromagnet 13 will automatically generate magnetic force to support the magnetic levitation rotor 16. In other words, when the speed of the motor shaft 12 of the air-suspended high-speed centrifugal fan becomes unstable due to objective factors, the magnetic levitation electromagnet 13 will automatically intervene to support the rotation of the motor shaft 12 through the magnetic levitation rotor 16, thereby ensuring the stability of the overall rotation of the motor shaft 12.

[0044] As an embodiment of the present invention, Figure 6 、 Figure 7 and Figure 8 As shown, the bearing foil 18 includes a cylindrical extruded foil surface 181, and a plurality of arc-shaped elastic foil surfaces 182 are distributed on the outer side of the cylindrical extruded foil surface 181. A docking portion 183 is connected between the plurality of arc-shaped elastic foil surfaces 182. One end of the cylindrical extruded foil surface 181 is fixedly connected to a fixed end portion 184, and the fixed end portion 184 is fixedly connected to the inner side surface of the foil bearing 14. The two ends of the cylindrical extruded foil surface 181 are respectively provided with docking terminals. The starting circuit of the magnetic levitation electromagnet 13 is connected in series with the docking terminals. It should be noted that since the docking portion 183 is connected between the plurality of arc-shaped elastic foil surfaces 182, the plurality of arc-shaped elastic foil surfaces 183 are connected to the inner side surface of the foil bearing 14. The foil surface 182 can be formed into a whole by the docking portion 183, and the arc-shaped elastic foil surface 182 at one end close to the fixed end portion 184 is fixedly connected to the outer side surface of the cylindrical extruded foil surface 181. However, the other arc-shaped elastic foil surfaces 182 and the outer side surface of the cylindrical extruded foil surface 181 are sliding. Therefore, when the cylindrical extruded foil surface 181 is subjected to the air pressure on its inner side surface, the cylindrical extruded foil surface 181 will act on the arc-shaped elastic foil surface 182 on its outer side surface, causing the arc-shaped elastic foil surface 182 to undergo elastic deformation. The elastically deformed arc-shaped elastic foil surface 182 will slide on the outer side surface of the cylindrical extruded foil surface 181.

[0045] The two ends of the cylindrical extruded foil surface 181 are respectively provided with docking terminals. When the cylindrical extruded foil surface 181 is closed, the docking terminals at both ends of the cylindrical extruded foil surface 181 are closed. When the cylindrical extruded foil surface 181 is deformed by the action of air pressure, the docking terminals at both ends of the cylindrical extruded foil surface 181 will also open.

[0046] A fixing groove that fits with the fixed end 184 is opened on the inner side surface of the foil bearing 14 near the fixed end 184, and one end of the cylindrical extruded foil surface 181 can be fixed to the inner side surface of the foil bearing 14 through the cooperation between the fixed end 184 and the fixing groove.

[0047] As an embodiment of the present invention, Figures 1-9 As shown, when the butt terminals at both ends of the cylindrical extruded foil surface 181 abut against each other, the diameter of the closed circular ring formed by the cylindrical extruded foil surface 181 exceeds the maximum diameter of the rotating member 17 by 4 to 10 microns. It should be noted that when the air suspension high-speed centrifugal fan is in the shutdown state, there is no gas inside the motor housing 1, so that the inner side surface of the cylindrical extruded foil surface 181 will not be affected by air pressure. Therefore, the elastic force of the arc-shaped elastic foil surface 182 on the outer side surface of the cylindrical extruded foil surface 181 will act on the cylindrical extruded foil surface 181, causing the cylindrical extruded foil surface 181 to automatically close and form a circular ring, and the diameter of the circular ring exceeds the maximum diameter of the rotating member 17 by 4 to 10 microns. Therefore, when the rotating member 17 is in the middle position of the inner side surface of the cylindrical extruded foil surface 181, there is a gap between the outer side surface of the rotating member 17 and the inner side surface of the cylindrical extruded foil surface 181. In this way, the rotation of the rotating member 17 will not rub against the inner side surface of the cylindrical extruded foil surface 181, that is, the rotation of the rotating member 17 is not affected.

[0048] When the air suspension high-speed centrifugal fan is in the on state, the interior of the motor housing 1 is filled with flowing air, so that the inner side of the cylindrical extruded foil surface 181 will be affected by the air pressure. After being affected by the air pressure, the cylindrical extruded foil surface 181 will overcome the elastic force of the arc-shaped elastic foil surface 182, and the cylindrical extruded foil surface 181 will automatically deform and expand, and then the gap between the inner side of the cylindrical extruded foil surface 181 and the rotating part 17 will increase, generally to 20 microns to 50 microns.

[0049] As an embodiment of the present invention, Figure 7 and Figure 8 As shown, the butt-jointed terminal includes a fixed arc-shaped conductor portion 185 and a movable arc-shaped conductor portion 186. It should be noted that the butt-jointed surface between the fixed arc-shaped conductor portion 185 and the movable arc-shaped conductor portion 186 is arc-shaped to avoid a tip discharge effect between the fixed arc-shaped conductor portion 185 and the movable arc-shaped conductor portion 186. Figure 7 185 is a diagram showing a state in which the fixed arc-shaped conductor portion 185 and the movable arc-shaped conductor portion 186 are separated. Figure 8The diagram shows the fixed arc-shaped conductor portion 185 and the movable arc-shaped conductor portion 186 in contact with each other. The docking terminals at both ends of the cylindrical extruded foil surface 181 are the fixed arc-shaped conductor portion 185 and the movable arc-shaped conductor portion 186. The fixed arc-shaped conductor portion 185 and the movable arc-shaped conductor portion 186 are connected in series with the starting circuit of the magnetic levitation electromagnet 13. When the fixed arc-shaped conductor portion 185 and the movable arc-shaped conductor portion 186 are separated, the starting circuit of the magnetic levitation electromagnet 13 is disconnected, and the magnetic levitation electromagnet 13 does not generate magnetic force. When the fixed arc-shaped conductor portion 185 and the movable arc-shaped conductor portion 186 are in contact with each other, the starting circuit of the magnetic levitation electromagnet 13 is closed, and the magnetic levitation electromagnet 13 generates magnetic force. In this way, the magnetic levitation electromagnet 13 generates a supporting force on the magnetic levitation rotor 16, causing the magnetic levitation rotor 16 to float inside the magnetic levitation electromagnet 13.

[0050] As an embodiment of the present invention, Figure 6 and Figure 9 As shown, a first delay combination portion 187 and a second delay combination portion 188 are provided at the middle positions of both ends of the cylindrical extruded foil surface 181. It should be noted that when the bearing foil 18 is in a closed circular ring state, the air pressure between the bearing foil 18 and the rotating member 17 reaches a certain pressure, so that the first delay combination portion 187 and the second delay combination portion 188 are separated. There is an interaction force between the first delay combination portion 187 and the second delay combination portion 188. Therefore, the air pressure threshold between the bearing foil 18 and the rotating member 17 is controlled according to the magnitude of the interaction force between the first delay combination portion 187 and the second delay combination portion 188. When the air pressure between the bearing foil 18 and the rotating member 17 reaches the air pressure threshold, the interaction force between the first delay combination portion 187 and the second delay combination portion 188 is overcome, so that the first delay combination portion 187 and the second delay combination portion 188 are separated. In this way, it can be ensured that the air pressure between the bearing foil 18 and the rotating member 17 reaches stability before the bearing foil 18 is expanded and deformed from the closed state.

[0051] Therefore, by providing the first delay coupling portion 187 and the second delay coupling portion 188, it is ensured that after the air pressure between the bearing foil 18 and the rotating member 17 reaches stability, the circuit of the magnetic levitation electromagnet 13 is automatically disconnected, so that the magnetic levitation electromagnet 13 is automatically turned off, which saves electric energy and ensures frictionless rotation of the motor shaft 12.

[0052] In particular, when the gas inside the air-suspended high-speed centrifugal fan experiences multiple small-frequency fluctuations within a certain time period, the first delay combination 187 and the second delay combination 188 can prevent the bearing foil 18 from undergoing multiple elastic deformations within the time period, and prevent the magnetic suspension electromagnet 13 from being repeatedly started and shut down, thereby ensuring the stability of the operation of the motor shaft 12.

[0053] As an embodiment of the present invention, Figure 6 、 Figure 9 and Figure 10 As shown, the first delay combining part 187 is the first combining magnet 187a, and the second delay combining part 188 is the second combining magnet 188a. The polarities of the opposing surfaces of the first combining magnet 187a and the second combining magnet 188a are opposite. It should be noted that since the polarities of the opposing surfaces of the first combining magnet 187a and the second combining magnet 188a are opposite, mutual attraction will be generated between the first combining magnet 187a and the second combining magnet 188a. The size of the mutual attraction between the first combining magnet 187a and the second combining magnet 188a is adaptively selected by technical personnel in this field according to the air pressure threshold, including selecting the material and size of the first combining magnet 187a and the second combining magnet 188a.

[0054] As an embodiment of the present invention, Figure 6 、 Figure 9 、 Figure 11 and Figure 12 As shown, the first delay combining portion 187 is a first combining card 187b, and the second delay combining portion 188 is a second combining card 188b, wherein the first combining card 187b is provided with a plurality of first protrusions 187b1, and a first recessed portion 187b2 is provided between the plurality of first protrusions 187b1, and the second combining card 188b is provided with a plurality of second protrusions 188b1, and a second recessed portion 188b2 is provided between the plurality of second protrusions 188b1, and the plurality of first protrusions 187b1 and the plurality of second recessed portions 188b2 correspond to and match one by one, and the plurality of second protrusions 188b1 and the plurality of first recessed portions 187b2 correspond to and match one by one, and the end portion of the first protrusion 187b1 is provided with a first receiving portion 187b3, and the end portion of the second protrusion 188b1 is provided with a second receiving portion 188b3. It should be noted that when the bearing When the foil 18 is closed, the first recessed portion 187b2 on the first coupling card 187b will cooperate with the second protruding portion 188b1 on the second coupling card 188b, and the first protruding portion 187b1 on the first coupling card 187b will cooperate with the second recessed portion 188b2, so that the first coupling card 187b and the second coupling card 188b can generate a mutual attraction. When gas enters the interior of the motor housing 1, that is, the gap between the rotating member 17 and the bearing foil 18, the gas will generate air pressure due to the wedge effect and act on the inner surface of the bearing foil 18. When the air pressure on the inner surface of the bearing foil 18 is greater than the mutual attraction between the first coupling card 187b and the second coupling card 188b, the first coupling card 187b and the second coupling card 188b will separate, and the bearing foil 18 will also deform and expand, so that the magnetic levitation electromagnet 13 will automatically disconnect.

[0055] Since the first receiving portion 187b3 is formed at the end of the first protruding portion 187b1, when the first protruding portion 187b1 is subjected to the deformation force of the bearing foil 18, the end of the first protruding portion 187b1 will elastically deform toward the first receiving portion 187b3, so that the first protruding portion 187b1 can automatically disengage from the second recessed portion 188b2 on the second coupling card 188b;

[0056] The same is true for the second coupling card 188b. When the second protrusion 188b1 is subjected to the deformation force of the bearing foil 18, the end of the second protrusion 188b1 will elastically deform toward the second receiving portion 188b3, so that the second protrusion 188b1 can automatically detach from the first recessed portion 187b2 on the first coupling card 187b.

[0057] The first protrusion 187b1 and the second protrusion 188b1 are both made of memory metal, and the phase transition temperature of the memory metal is above 150 degrees Celsius. It should be noted that the phase transition temperature of the memory metal is between 150 degrees Celsius and 170 degrees Celsius. When the temperature inside the rotating part 17 and the bearing foil 18 reaches 150 degrees Celsius to 170 degrees Celsius, it means that the rotation of the rotating part 17 is in an abnormal state, so the temperature will rise abnormally. At this time, the first protrusion 187b1 and the second protrusion 188b1 will automatically undergo phase change. That is, the end of the first protrusion 187b1 is deformed toward the first receiving portion 187b3, and the end of the second protrusion 188b1 is deformed toward the second receiving portion 188b3, automatically releasing the mutual attraction between the first combining card 187b and the second combining card 188b, facilitating the elastic deformation of the bearing foil 18, thereby increasing the gap between the inner surface of the bearing foil 18 and the rotating part 17, increasing the gas flow between the inner surface of the bearing foil 18 and the rotating part 17, and reducing the temperature between the inner surface of the bearing foil 18 and the rotating part 17.

[0058] As an embodiment of the present invention, Figure 6 、 Figure 9 and 13As shown, the first time-delay joint 187 is a first wind pressure card 187c, and the second time-delay joint 188 is a second wind pressure card 188c, wherein the top surface of the first wind pressure card 187c is provided with a first wedge-shaped wind guide groove 187c1, and the top surface of the second wind pressure card 188c is provided with a second wedge-shaped wind guide groove 188c1. It should be noted that the volume of the first wedge-shaped wind guide groove 187c1 gradually decreases along the direction of gas flow, and the volume of the second wedge-shaped wind guide groove 188c1 gradually decreases along the direction of gas flow. When gas flow occurs between the outer side surface of the rotating part 17 and the inner side surface of the bearing foil 18, The gas will produce a wedge effect between the first wedge-shaped air guide groove 187c1 and the second wedge-shaped air guide groove 188c1, and act on the inner side surfaces of the first wedge-shaped air guide groove 187c1 and the second wedge-shaped air guide groove 188c1, which will generate an interaction force between the first wind pressure card 187c and the second wind pressure card 188c. The specifications of the first wedge-shaped air guide groove 187c1 and the second wedge-shaped air guide groove 188c1 are set by technical personnel in this field according to the size of the gas threshold. The specifications of the first wedge-shaped air guide groove 187c1 and the second wedge-shaped air guide groove 188c1 include width, slope, length and depth.

[0059] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An air-suspended high-speed centrifugal fan with a hybrid bearing structure, characterized in that: include: A motor part and an impeller part, wherein the motor part comprises a motor housing (1), a motor stator (11) disposed in the motor housing (1), and a motor shaft (12) matched with the motor stator (11); The motor rotor (15), the magnetic suspension rotor (16) and the rotating member (17) are sequentially arranged on the side of the motor shaft (12) along the axial direction. The positions of the magnetic suspension rotor (16) and the rotating member (17) are respectively arranged inside the motor housing (1), wherein a magnetic suspension electromagnet (13) and a foil bearing (14) are arranged between the foil bearing (14) and the rotating member (17). The bearing foil (18) controls the starting circuit of the magnetic suspension electromagnet (13) based on the deformation generated by air pressure. When no gas pressure is generated between the rotating member (17) and the bearing foil (18), the bearing foil (18) is elastically supported by itself when viewed from the end position of the bearing foil (18). Under the action of the force, a complete circular ring is formed, and the starting circuit of the magnetic levitation electromagnet (13) passes through the bearing foil (18), and the bearing foil (18) closes the starting circuit of the magnetic levitation electromagnet (13); when the amount of gas entering the gap between the rotating part (17) and the bearing foil (18) increases, the gas will generate sufficient air pressure between the rotating part (17) and the bearing foil (18) due to the wedge effect, so that the rotating part (17) rotates stably inside the bearing foil (18), and the air pressure will also act on the bearing foil (18), causing the bearing foil (18) to deform; the contact part on the bearing foil (18) will separate, so that the starting circuit of the magnetic levitation electromagnet (13) is automatically disconnected; The bearing foil (18) comprises a cylindrical extruded foil surface (181), a plurality of arc-shaped elastic foil surfaces (182) are distributed on the outer side of the cylindrical extruded foil surface (181), a docking portion (183) is connected between the plurality of arc-shaped elastic foil surfaces (182), one end of the cylindrical extruded foil surface (181) is fixedly connected to a fixed end portion (184), the fixed end portion (184) is fixedly connected to the inner side surface of the foil bearing (14), and docking terminals are respectively provided at both ends of the cylindrical extruded foil surface (181). The starting circuit of (13) is connected in series with the docking terminal; when the docking terminals at both ends of the cylindrical extruded foil surface (181) abut against each other, the diameter of the closed ring formed by the cylindrical extruded foil surface (181) exceeds the maximum diameter of the rotating member (17) by 4 microns to 10 microns; the docking terminal includes a fixed arc-shaped conductor part (185) and a movable arc-shaped conductor part (186); a first delay joint part (187) and a second delay joint part (188) are provided at the middle position of the two ends of the cylindrical extruded foil surface (181).

2. The air suspension high-speed centrifugal fan with a hybrid bearing structure according to claim 1, characterized in that: The first time-delay combining portion (187) is a first combining magnet (187a), the second time-delay combining portion (188) is a second combining magnet (188a), and the polarities of the opposing surfaces of the first combining magnet (187a) and the second combining magnet (188a) are opposite.

3. The air-suspended high-speed centrifugal fan with a hybrid bearing structure according to claim 2, characterized in that: The first time-delayed combining portion (187) is a first combining card (187b), and the second time-delayed combining portion (188) is a second combining card (188b), wherein the first combining card (187b) is provided with a plurality of first protruding portions (187b1), and a first recessed portion (187b2) is provided between the plurality of first protruding portions (187b1); and the second combining card (188b) is provided with a plurality of second protruding portions (188b1), and a second recessed portion (188b2) is provided between the plurality of second protruding portions (188b1); The plurality of first protruding portions (187b1) and the plurality of second recessed portions (188b2) correspond one-to-one and match each other, and the plurality of second protruding portions (188b1) and the plurality of first recessed portions (187b2) correspond one-to-one and match each other.

4. The air-suspended high-speed centrifugal fan with a hybrid bearing structure according to claim 3, characterized in that: A first receiving portion (187b3) is provided at the end of the first protruding portion (187b1), and a second receiving portion (188b3) is provided at the end of the second protruding portion (188b1).

5. The air-suspended high-speed centrifugal fan with a hybrid bearing structure according to claim 4, characterized in that: The first protrusion (187b1) and the second protrusion (188b1) are both made of memory metal, and the phase change temperature of the memory metal is above 150 degrees Celsius.

6. The air-suspended high-speed centrifugal fan with a hybrid bearing structure according to claim 5, characterized in that: The first time-delay joint (187) is a first wind pressure card (187c), and the second time-delay joint (188) is a second wind pressure card (188c), wherein the top surface of the first wind pressure card (187c) is provided with a first wedge-shaped wind guide groove (187c1), and the top surface of the second wind pressure card (188c) is provided with a second wedge-shaped wind guide groove (188c1).

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