Magnetic levitation high-speed centrifugal compressor

Abstract

The application relates to a magnetic suspension high-speed centrifugal compressor applied to the field of compressors. Through the arrangement of a water channel heat dissipation passage and an outer air channel heat dissipation passage, the compressor can be cooled from outside to inside, the temperature near the center rotor is reduced, the probability of the expansion deformation of the center rotor caused by overheating is effectively reduced, the inner air channel heat dissipation passage is arranged at the air gap between the center rotor and the stator, a large amount of heat near the air gap can be adsorbed, the low-temperature gas directly passes through the inner air channel heat dissipation passage to take away the heat, compared with the prior art, the targeted cooling of the air gap can be realized under the condition that the low-temperature gas does not directly contact the center rotor, the shaft jumping caused by the expansion deformation of the center rotor due to high temperature can be effectively reduced, the control difficulty of the bearing controller for maintaining the balance of the center rotor is not easily additionally increased due to the disturbance of the low-temperature gas, and the efficient operation of the compressor is effectively ensured.

Description

Technical Field

[0001] The present invention relates to a magnetically levitated high-speed centrifugal compressor, and more particularly to a magnetically levitated high-speed centrifugal compressor applied in the field of compressors. Background Technology

[0002] A magnetic levitation bearing is a type of bearing that uses a magnetic field to levitate the rotor, thus eliminating mechanical friction during rotation. Using magnetic levitation bearings in refrigeration compressors enables oil-free operation of the refrigeration system, avoiding the need for complex lubrication systems.

[0003] Although the magnetic levitation design reduces heat generation due to mechanical wear, the compressor's internal temperature can still be high during operation due to gas temperature rise during compression and electromagnetic losses. In severe cases, this can cause thermal expansion of the central shaft, leading to an increase in rotor diameter, a reduction in the air gap, and increased difficulty in magnetic control. In extreme cases, it can cause shaft imbalance and collision with the bearings.

[0004] Based on the above problems, some existing technologies have adopted a hollow shaft design and introduced low-temperature gas for cooling. For example, the motor cooling circuit through the hollow shaft disclosed in Chinese Patent Specification CN114629299A, or the cooling gas is sprayed out of the air gap to the central shaft to accelerate heat dissipation, keep the central shaft at a relatively low temperature, and maintain its stability. For example, a magnetic levitation fan with impeller self-cooling disclosed in Chinese Patent Specification CN113217426B.

[0005] However, regardless of whether the cryogenic fluid is introduced for heat dissipation inside or outside the central shaft, the inherent velocity of the gas will have a certain impact on the rotor, which will also cause a certain amount of vibration in the rotor shaft, increasing the difficulty for the bearing controller to control the rotor's balance and levitation. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the central rotor is prone to thermal expansion and deformation due to overheating, which leads to shaft runout.

[0007] To address the aforementioned problems, this invention provides a magnetic levitation high-speed centrifugal compressor, comprising a magnetic levitation drive unit and a primary compression volute and a double-channel volute fixedly installed at the left and right ends of the magnetic levitation drive unit. A connecting pipe is fixedly connected between the air outlet of the primary compression volute and the air inlet of the secondary compression volute. An external heat dissipation unit is fixedly wrapped around the outer end of the magnetic levitation drive unit. Bearing seats are fixedly connected to the left and right ends of the external heat dissipation unit by bolts. A base is fixedly connected to the lower end of each of the two bearing seats. The magnetic levitation drive unit includes a central rotor, magnetic levitation bearings installed at both ends of the central rotor, and a stator movably sleeved in the middle of the outer end of the central rotor. The stator, the central rotor, and the two magnetic levitation bearings are coaxially arranged and do not contact each other. The two magnetic levitation bearings are respectively fixedly coaxially to the two bearing seats. A temperature sensor is installed on the outer end of the magnetic levitation bearings near the secondary compression volute. An air gap is formed between the central rotor and the stator. An internal air channel heat dissipation channel is provided in the air gap. The internal air channel heat dissipation channel is movably sleeved outside the central rotor and does not contact the central rotor. The internal air channel heat dissipation channel is coaxial with the stator and fixedly connected to the inner wall of the stator.

[0008] The external heat dissipation unit includes a double-casing shell fitted outside the stator, an air distribution shroud fixedly connected to the outer end of the double-casing shell near the first-stage compressor volute, and a diversion and ventilation ring fixedly connected to the outer end of the double-casing shell near the second-stage compressor volute. Two isolation rings are fixedly connected to the outer end of the stator. The double-casing shell includes an inner shell, an outer shell fixedly wrapped around the middle of the outer end of the inner shell, and a diversion strip fixedly connected to the outer end of the inner shell. The diversion strip is located inside the outer shell. The outer rings of the two isolation rings are in contact with the inner wall of the inner shell. Two horizontally parallel water passages are fixedly connected to the middle of the outer end of the outer shell. Both water passages communicate with the space enclosed by the outer shell and the inner shell. The outer shell, the inner shell, and the diversion strip form a water channel for heat dissipation. The air distribution shroud, the double-casing shell, and the diversion and ventilation ring together form an external air channel for heat dissipation.

[0009] In the aforementioned magnetic levitation high-speed centrifugal compressor, the external water cooling channel, the external air cooling channel, and the internal air cooling channel set between the central rotor and the stator can achieve cooling of both the inner and outer parts of the central rotor without the low-temperature gas directly contacting the central shaft. This facilitates the maintenance of its stability and does not increase the difficulty of the bearing controller in balancing the central rotor.

[0010] As a further improvement of this application, the flow divider has a spiral structure, and the outer end of the flow divider is in contact with the inner wall of the outer casing.

[0011] As a further improvement of this application, multiple air inlets and multiple exhaust outlets are respectively drilled at the left and right outer ends of the inner cover. The multiple air inlets are located inside the air distribution cover, and the multiple exhaust outlets are located inside the diversion and ventilation ring. Multiple air holes distributed in a ring array are drilled on the air isolation ring.

[0012] As a further improvement of this application, the gas equalization hood includes an air inlet half-hood and an air guide half-hood that are fixedly connected to each other by bolts. When the two are fixed together, their inner sides form a complete circle, and the circle matches the outer wall of the inner shell.

[0013] As a further improvement of this application, one of the exhaust inner holes is an arc-shaped elongated hole, and the other multiple exhaust inner holes are rectangular elongated holes. The diversion and ventilation ring includes a diversion seat corresponding to the arc-shaped elongated hole and a diversion ring body fixedly connected to the diversion seat. Fine holes are drilled on both the diversion seat and the diversion ring body. The air distribution hood, the air inlet hole, the exhaust inner hole, and the fine holes on the diversion and ventilation ring are connected in sequence.

[0014] As another improvement of this application, the internal air duct heat dissipation vent includes a double-layer cylinder and side rings fixedly connected to the left and right ends of the double-layer cylinder. Both side rings are fixedly connected to air guide pipes. In a side view, the two air guide pipes are symmetrical about the vertical center line of the double-layer cylinder. The double-layer cylinder is a hollow structure, and a partition strip is fixedly connected inside the double-layer cylinder. The partition strip is located between the two air guide pipes. Multiple evenly distributed temperature-sensing moving strips are also fixedly connected between the two side rings. The temperature-sensing moving strips are located inside the hollow double-layer cylinder.

[0015] As a further improvement to this application, the temperature-sensing moving strip includes a heat-absorbing wire located inside the double-layer cylinder, a follower wire and a temperature-sensing wire respectively fixedly connected to the left and right ends of the heat-absorbing wire, and two limiting balls respectively fixedly connected to the ends of the follower wire and the temperature-sensing wire. The two limiting balls are respectively fixedly connected to two side rings, and the follower wire and the temperature-sensing wire both move through the corresponding side rings.

[0016] As a further improvement to this application, the temperature sensing wire is made of a two-way memory alloy material, the follower wire is made of a high-temperature resistant elastic material, and the double-layer cylinder, the side ring, and the heat-absorbing wire are all made of materials with high thermal conductivity and low magnetic permeability.

[0017] In summary, by setting up external water cooling channels and external air cooling channels, the compressor can dissipate heat from the outside in, thereby reducing the temperature near the central rotor. At the same time, an internal air cooling channel is set in the air gap between the central rotor and the stator. The internal air cooling channel and its internal structure are made of high thermal conductivity materials, which can absorb a large amount of heat near the air gap. Then, low-temperature gas directly passes through the internal air cooling channel and carries away this heat, achieving cooling. Compared with existing technologies, targeted cooling of the air gap can be achieved without the low-temperature gas directly contacting the central rotor. This effectively reduces the occurrence of shaft runout caused by high-temperature expansion and deformation of the central rotor. At the same time, it is less likely that the bearing controller will face additional difficulties in maintaining the balance of the central rotor due to the disturbance of low-temperature gas, effectively ensuring the efficient operation of the compressor. Attached Figure Description

[0018] Figure 1 This is a perspective view of the first embodiment of this application from a frontal angle;

[0019] Figure 2 This is a perspective view of the rear view of the first embodiment of this application;

[0020] Figure 3 This is an exploded view of the first embodiment of this application;

[0021] Figure 4 This is an exploded view of the water channel heat dissipation passage portion according to the first embodiment of this application;

[0022] Figure 5 This is a partial cross-sectional schematic diagram of the first embodiment of this application;

[0023] Figure 6 for Figure 5 A schematic diagram at point A in the middle;

[0024] Figure 7 This is an exploded schematic diagram of the internal air duct heat dissipation channel between the stator and the central rotor according to the first embodiment of this application.

[0025] Figure 8 This is a perspective view of the internal airflow heat dissipation channel according to the first embodiment of this application;

[0026] Figure 9 This is a radial cross-sectional schematic diagram of the internal air duct heat dissipation channel according to the second embodiment of this application;

[0027] Figure 10 This is a comparative schematic diagram of the temperature-sensing moving strip before and after heating, according to the second embodiment of this application.

[0028] Explanation of the labels in the diagram:

[0029] 1. Primary compression volute, 2. Double-channel casing, 21. Outer casing, 22. Inner casing, 23. Diverter bar, 201. Base, 202. Water passage hole, 203. Isolation ring, 3. Secondary compression volute, 4. Connecting pipe, 5. Gas equalization hood, 51. Inlet half-hood, 52. Guide half-hood, 501. Inlet hole, 502. Exhaust inner hole, 6. Diverter vent ring, 61. Diverter seat, 62. Diverter ring body, 71. Central rotor, 72. Stator, 701. Magnetic levitation bearing, 702. Bearing seat, 8. Internal air passage heat dissipation channel, 81. Double-layer cylinder, 82. Side ring, 83. Guide pipe, 801. Separator bar, 9. Temperature sensing moving bar, 91. Heat absorption wire, 92. Follower wire, 93. Temperature sensing wire, 94. Limiting ball. Detailed Implementation

[0030] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0031] First implementation method:

[0032] Figure 1-2 This invention illustrates a magnetic levitation high-speed centrifugal compressor, comprising a magnetic levitation drive unit and a primary compression volute 1 and a secondary compression volute 3 fixedly mounted at the left and right ends of the magnetic levitation drive unit. A connecting pipe 4 is fixedly connected between the air outlet of the primary compression volute 1 and the air inlet of the secondary compression volute 3. An external heat dissipation unit is fixedly wrapped around the outer end of the magnetic levitation drive unit. Bearing seats 702 are fixedly connected to both ends of the external heat dissipation unit by bolts. Bases 201 are fixedly connected to the lower ends of both bearing seats 702. Figure 3 The magnetic levitation drive unit includes a central rotor 71, magnetic levitation bearings 701 installed at both ends of the central rotor 71, and a stator 72 movably sleeved in the middle of the outer end of the central rotor 71. The stator 72, the central rotor 71, and the two magnetic levitation bearings 701 are coaxially arranged and do not contact each other. The two magnetic levitation bearings 701 are coaxially fixed to two bearing seats 702 respectively. A temperature sensor is installed on the outer end of the central rotor 71 near the secondary compression volute 3, which can monitor the temperature change of the central rotor 71 in real time and facilitate the adjustment of the temperature of the introduced low-temperature gas and low-temperature water.

[0033] like Figure 3 The external heat dissipation unit includes a double-channel housing 2 fitted outside the stator 72, an air distribution cover 5 fixedly connected to the outer end of the double-channel housing 2 near the first-stage compressor volute 1, and a flow-diverting and venting ring 6 fixedly connected to the outer end of the double-channel housing 2 near the second-stage compressor volute 3. Two air-blocking rings 203 are fixedly connected to the outer end of the stator 72. The double-channel housing 2 includes an inner cover 22, an outer cover 21 fixedly wrapped around the middle of the outer end of the inner cover 22, and a flow-diverting strip 23 fixedly connected to the outer end of the inner cover 22. The flow-diverting strip 23 is located inside the outer cover 21. The outer rings of the two air-blocking rings 203 are in contact with the inner wall of the inner cover 22. During use, low-temperature water can be passed into the water channel heat dissipation channel through the water passage 202, so that it will circulate internally and then flow out, which can carry away more heat, so that the temperature of the compressor during operation will not be too high, thereby preventing the operating temperature of the central rotor 71 from being too high and reducing the risk of thermal deformation.

[0034] like Figure 4 Two horizontally parallel water passage holes 202 are fixedly connected to the middle of the outer end of the outer casing 21. One of them serves as a water inlet and the other as a water outlet. Both water passage holes 202 communicate with the space enclosed by the outer casing 21 and the inner casing 22. The outer casing 21, the inner casing 22, and the diverter strip 23 form a water channel for heat dissipation. The diverter strip 23 has a spiral structure, and the outer end of the diverter strip 23 contacts the inner wall of the outer casing 21, making the water channel for heat dissipation spiral-shaped. This makes the water flow path within it longer and improves the utilization rate of water when cooling the compressor.

[0035] The air distribution hood 5, the double-channel shell 2, and the diversion and ventilation ring 6 form an external air duct heat dissipation channel. Multiple air inlets 501 and multiple exhaust outlets 502 are respectively drilled at the left and right outer ends of the inner shell 22. The multiple air inlets 501 are located inside the air distribution hood 5, and the multiple exhaust outlets 502 are located inside the diversion and ventilation ring 6. Multiple air holes arranged in a ring-shaped array are drilled on the air isolation ring 203. The air distribution hood 5 includes an air inlet half-hood 51 and an air guide half-hood 52 that are fixedly connected to each other by bolts. When the two are fixed together, their inner sides form a complete circle, which matches the outer wall of the inner shell 22.

[0036] like Figure 4 One of the exhaust inner holes 502 is an arc-shaped elongated hole, while the other exhaust inner holes 502 are rectangular elongated holes. The flow-dividing vent ring 6 includes a flow-dividing seat 61 corresponding to the arc-shaped elongated hole and a flow-dividing ring body 62 fixedly connected to the flow-dividing seat 61. Both the flow-dividing seat 61 and the flow-dividing ring body 62 have fine holes drilled on them. The flow-dividing vent ring 6 blocks multiple exhaust inner holes 502, preventing external debris from accidentally entering the compressor due to excessively large gaps. The air distribution cover 5, the air inlet 501, the exhaust inner holes 502, and the fine holes on the flow-dividing vent ring 6 are sequentially connected, forming a complete passage for the external air duct heat dissipation channel. When this compressor is in use, the opening in the middle of the intake half cover 51 can be connected to an air pump or blower. By blowing air or other low-temperature gases into the heat dissipation channel of the external air passage, the gas enters the interior of the double-channel housing 2 along the gas equalization cover 5 and surrounds the outside of the stator. Then, it passes through the air holes on the air isolation ring 203, the exhaust inner hole 502, and the flow-dividing permeable ring 6, thereby carrying away the heat inside the compressor and discharging it. This part of the heat is mainly the heat outside the stator, thereby further reducing the temperature of the compressor and preventing the temperature of the central rotor 71 from becoming too high, reducing the possibility of it expanding and deforming due to overheating.

[0037] like Figure 5-7An air gap is formed between the central rotor 71 and the stator 72. An internal air channel heat dissipation vent 8 is installed within this air gap. The internal air channel heat dissipation vent 8 is movably sleeved outside the central rotor 71 without contacting it. The internal air channel heat dissipation vent 8 is coaxial with the stator 72 and fixedly connected to the inner wall of the stator 72. The internal air channel heat dissipation vent 8 includes a double-layered cylindrical body 81 and side rings 82 fixedly connected to the left and right ends of the double-layered cylindrical body 81. Air guide pipes 83 are fixedly connected to the outer ends of both side rings 82. From a side view, the two air guide pipes 83 are symmetrical about the vertical centerline of the double-layered cylindrical body 81. The double-layered cylindrical body 81 is a hollow structure, and a partition strip 801 is fixedly connected inside the double-layered cylindrical body 81, located between the two air guide pipes 83. In use, the internal air channel heat dissipation vent 8 can absorb a large amount of heat from the air gap. When low-temperature gas is introduced into the air guide pipe 83 near the secondary compressor volute 3, the low-temperature gas circulates around the internal space of the internal air channel heat dissipation vent 8 and is discharged through another air guide pipe 83. This low-temperature gas can quickly exchange heat with the internal air channel heat dissipation vent 8, thereby directly driving most of the heat in the air gap. At this time, the low-temperature gas flowing in the internal air channel heat dissipation vent 8 does not directly contact the central rotor 71, so it is not easy to be impacted by gas fluctuations. This effectively ensures the stability of the central rotor 71 when targeted heat dissipation is applied to the air gap, so that the bearing controller does not have to increase the difficulty of maintaining the balance and floating of the central rotor 71.

[0038] In summary, by setting up external water cooling channels and external air cooling channels, the compressor can be cooled from the outside in, thereby reducing the temperature near the central rotor 71 and lowering the risk of thermal deformation of the central rotor 71. At the same time, an internal air cooling channel 8 is set in the air gap between the central rotor 71 and the stator 72. The internal air cooling channel 8 is made of a high thermal conductivity material, which can absorb a large amount of heat near the air gap. Then, the low-temperature gas directly passes through the interior of the internal air cooling channel 8 and carries away this heat, achieving cooling. Compared with the existing technology, targeted cooling of the air gap can be achieved without the low-temperature gas directly contacting the central rotor 71, effectively reducing the occurrence of shaft runout caused by high-temperature expansion and deformation of the central rotor 71. At the same time, it is less likely that the bearing controller will face additional difficulties in maintaining the balance of the central rotor 71 due to the disturbance of the low-temperature gas, effectively ensuring the efficient operation of the compressor.

[0039] Second implementation method:

[0040] This embodiment adds a temperature-sensing moving strip 9 to the first embodiment, while the rest remains the same as the first embodiment.

[0041] Figure 9-10As shown, multiple evenly distributed temperature-sensing moving strips 9 are fixedly connected between the two edge rings 82. The temperature-sensing moving strips 9 are located inside the hollow double-layer cylinder 81. Each temperature-sensing moving strip 9 includes a heat-absorbing wire 91 located inside the double-layer cylinder 81, a follower wire 92 and a temperature-sensing wire 93 fixedly connected to the left and right ends of the heat-absorbing wire 91, and two limiting balls 94 fixedly connected to the ends of the follower wire 92 and the temperature-sensing wire 93, respectively. The two limiting balls 94 are fixedly connected to the two edge rings 82, and the follower wire 92 and the temperature-sensing wire 93 are fixedly connected to the ends of the two edge rings 82, respectively. The three moving parts are connected through the corresponding side ring 82. The temperature sensing wire 93 is made of double-pass memory alloy material. Above the critical temperature, the temperature sensing wire 93 is spiral-shaped, and below the critical temperature, it is straight. The following wire 92 is made of high-temperature resistant elastic material. The double-layer cylinder 81, the side ring 82 and the heat-absorbing wire 91 are all made of materials with high thermal conductivity and low magnetic permeability, so that the internal air channel heat dissipation passage 8 and the temperature sensing moving strip 9 are not likely to affect the magnetic field between the central rotor 71 and the stator 72.

[0042] It is worth noting that the critical temperature of the temperature sensing wire 93 is located within the preset threshold range of the temperature sensor, and is the middle value of the regional threshold range. Furthermore, the threshold range is close to the safe operating temperature range of the central rotor 71 and is within the safe operating temperature range.

[0043] The temperature sensing wire 93 is located on the side of the heat-absorbing wire 91 near the secondary compression volute 3. Due to the dual-stage compression, the temperature on the side of the secondary compression volute 3 is relatively high. Therefore, during cooling, low-temperature gas is introduced from the gas guide pipe 83 near this side. As the low-temperature gas is introduced, the temperature difference between the low-temperature gas and this side becomes larger. With the stable introduction of the low-temperature gas, the temperature in the air gap gradually decreases. When the temperature drops below the critical temperature of the temperature sensing wire 93, the temperature sensing wire 93 gradually becomes spiral-shaped and shortens. At this time, the heat-absorbing wire 91 can be pulled towards the side of the secondary compression volute 3 and converge. At this time, the heat-absorbing wire 91 can absorb heat on the side near the secondary compression volute 3. When the temperature drops below the low value of the preset threshold range in the temperature sensor, the introduction of low-temperature gas can be stopped, or the introduction temperature of low-temperature gas can be increased, thereby saving the investment cost of the cold source.

[0044] As the low-temperature gas stops being introduced, the temperature gradually rises. When the temperature rises to the critical temperature of the sensing wire 93, the sensing wire 93 gradually becomes straight, thereby generating a thrust on the heat-absorbing wire 91. At the same time, under the action of the restoring elasticity of the moving wire 92, the heat-absorbing wire 91, which has absorbed some heat, moves towards the side of the first-stage compression volute 1, making it closer to the side of the first-stage compression volute 1. Due to its high heat absorption efficiency, some heat can be accumulated on the side close to the first-stage compression volute 1, thereby effectively alleviating the temperature difference caused by the first-stage compression volute 1 and the second-stage compression volute 3 themselves, and reducing the accumulation of heat on the side of the second-stage compression volute 3.

[0045] As the temperature rises further, when it reaches the high end of the threshold range, the supply of low-temperature gas is restored, thereby regulating the central rotor 71 to operate within a safe temperature range and reducing the probability of its thermal expansion deformation.

[0046] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A magnetically levitated high-speed centrifugal compressor, characterized in that: The system includes a magnetic levitation drive unit and a primary compression volute (1) and a double-channel volute (2) fixedly installed at the left and right ends of the magnetic levitation drive unit. A connecting pipe (4) is fixedly connected between the air outlet of the primary compression volute (1) and the air inlet of the secondary compression volute (3). An external heat dissipation unit is fixedly wrapped around the outer end of the magnetic levitation drive unit. Bearing seats (702) are fixedly connected to the left and right ends of the external heat dissipation unit by bolts. A base (201) is fixedly connected to the lower end of each of the two bearing seats (702). The magnetic levitation drive unit includes a central rotor (71), magnetic levitation bearings (701) installed at both ends of the central rotor (71), and a stator movably sleeved in the middle of the outer end of the central rotor (71). (72), the stator (72), the central rotor (71) and the two magnetic levitation bearings (701) are coaxially arranged and do not contact each other. The two magnetic levitation bearings (701) are coaxially fixed to the two bearing seats (702) respectively. A temperature sensor is installed on the outer end of the magnetic levitation bearing (701) near the secondary compression volute (3). An air gap is formed between the central rotor (71) and the stator (72). An internal air channel heat dissipation channel (8) is provided in the air gap. The internal air channel heat dissipation channel (8) is movably sleeved outside the central rotor (71) and does not contact the central rotor (71). The internal air channel heat dissipation channel (8) is coaxial with the stator (72) and is fixedly connected to the inner wall of the stator (72). The external heat dissipation unit includes a double-channel shell (2) fitted outside the stator (72), an air distribution shroud (5) fixedly connected to the outer end of the double-channel shell (2) near the first-stage compression volute (1), and a diversion and ventilation ring (6) fixedly connected to the outer end of the double-channel shell (2) near the second-stage compression volute (3). Two air-blocking rings (203) are fixedly connected to the outer end of the stator (72). The double-channel shell (2) includes an inner shell (22), an outer shell (21) fixedly wrapped around the middle of the outer end of the inner shell (22), and a diversion strip (23) fixedly connected to the outer end of the inner shell (22). The diversion strip (23) is located inside the outer shell (21). The outer rings of the two air-sealing rings (203) are in contact with the inner wall of the inner shell (22). Two horizontally parallel water holes (202) are fixedly connected to the middle of the outer end of the outer shell (21). The two water holes (202) are connected to the space enclosed by the outer shell (21) and the inner shell (22). The outer shell (21), the inner shell (22) and the diversion strip (23) form a water channel for heat dissipation. The air distribution cover (5), the double shell (2) and the diversion and ventilation ring (6) form an external air channel for heat dissipation.

2. The magnetic levitation high-speed centrifugal compressor according to claim 1, characterized in that: The diverter bar (23) has a spiral structure, and the outer end of the diverter bar (23) is in contact with the inner wall of the outer casing (21).

3. The magnetic levitation high-speed centrifugal compressor according to claim 1, characterized in that: The inner cover (22) has multiple air inlets (501) and multiple exhaust holes (502) respectively drilled on the left and right outer ends. The multiple air inlets (501) are located inside the air distribution cover (5), and the multiple exhaust holes (502) are located inside the diversion and ventilation ring (6). The air isolation ring (203) has multiple air holes arranged in a ring array.

4. A magnetically levitated high-speed centrifugal compressor according to claim 3, characterized in that: The air distribution cover (5) includes an air intake half cover (51) and an air guide half cover (52) that are fixed to each other by bolts. When the two are fixed to each other, their inner sides form a complete circle, and the circle matches the outer wall of the inner cover shell (22).

5. A magnetically levitated high-speed centrifugal compressor according to claim 4, characterized in that: One of the exhaust inner holes (502) is an arc-shaped elongated hole, and the other exhaust inner holes (502) are rectangular elongated holes. The diversion and ventilation ring (6) includes a diversion seat (61) corresponding to the arc-shaped elongated hole and a diversion ring body (62) fixedly connected to the diversion seat (61). Both the diversion seat (61) and the diversion ring body (62) have fine holes. The air equalization cover (5), the air inlet (501), the exhaust inner hole (502) and the fine holes on the diversion and ventilation ring (6) are connected in sequence.

6. A magnetically levitated high-speed centrifugal compressor according to claim 1, characterized in that: The internal air channel heat dissipation duct (8) includes a double-layer cylinder (81) and side rings (82) fixedly connected to the left and right ends of the double-layer cylinder (81). The outer ends of the two side rings (82) are fixedly connected to air guide pipes (83). From the side view angle, the two air guide pipes (83) are symmetrical about the vertical center line of the double-layer cylinder (81). The double-layer cylinder (81) is a hollow structure, and a partition strip (801) is fixedly connected inside the double-layer cylinder (81). The partition strip (801) is located between the two air guide pipes (83).

7. A magnetically levitated high-speed centrifugal compressor according to claim 6, characterized in that: Multiple uniformly distributed temperature-sensing moving strips (9) are fixedly connected between the two side rings (82). The temperature-sensing moving strips (9) are located inside the hollow double-layer cylinder (81). The temperature-sensing moving strips (9) include a heat-absorbing wire (91) located inside the double-layer cylinder (81), a follower wire (92) and a temperature-sensing wire (93) fixedly connected to the left and right ends of the heat-absorbing wire (91) respectively, and two limiting balls (94) fixedly connected to the ends of the follower wire (92) and the temperature-sensing wire (93) respectively. The two limiting balls (94) are fixedly connected to the two side rings (82) respectively. The follower wire (92) and the temperature-sensing wire (93) both move through the corresponding side rings (82).

8. A magnetically levitated high-speed centrifugal compressor according to claim 7, characterized in that: The temperature sensing wire (93) is made of a two-way memory alloy material, the follower wire (92) is made of a high-temperature resistant elastic material, and the double-layer cylinder (81), the side ring (82) and the heat-absorbing wire (91) are all made of materials with high thermal conductivity and low magnetic permeability.

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