Energy-saving magnetic suspension centrifugal compressor

Abstract

The invention provides an energy-saving magnetic suspension centrifugal compressor, and relates to the field of magnetic suspension centrifugal compressors. The energy-saving type magnetic suspension centrifugal compressor comprises a heat exchanger, a compressor body and a rotor shaft, the rotor shaft drives the compressor body and acts on the heat exchanger, the energy-saving type magnetic suspension centrifugal compressor further comprises two sets of magnetic suspension assemblies, a maintaining assembly and a gas supporting assembly, and the two ends, located outside a motor, of the rotor shaft are connected with the magnetic suspension assemblies and the maintaining assembly correspondingly. According to the energy-saving magnetic suspension centrifugal compressor, by arranging the maintaining assembly, the magnetic suspension assembly and the gas supporting assembly, a rotor and a bearing can be protected against damage, by arranging the gas supporting assembly, a motor shell is cooled, and wet gas or dust can be prevented from entering the magnetic suspension position of a rotor shaft; the magnetic suspension of the concentric disc is more stable, and stable high-speed operation can be kept even under the condition that one electromagnet is not stable.

Description

Technical Field

[0001] The invention relates to the field of magnetic suspension centrifugal compressors, in particular to an energy-saving magnetic suspension centrifugal compressor. Background Art

[0002] Magnetic levitation centrifugal compressors are widely used in refrigerators, air conditioners and other refrigeration and heating equipment. They mainly include a casing, a stator arranged in the casing and fixedly connected to the casing, a rotating shaft arranged in the stator, an impeller coaxially fixedly connected to the rotating shaft, a radial magnetic bearing for supporting the rotation of the rotating shaft, and an axial thrust bearing for maintaining the axial position of the rotating shaft. The magnetic levitation motor also includes a protective bearing (usually a roller bearing) arranged in the casing, which is used to carry the stationary rotating shaft. When the magnetic levitation centrifugal compressor is working, the radial magnetic bearing is energized to separate the rotating shaft from the protective bearing and suspend it. The magnetic levitation centrifugal compressor is the core component of the magnetic levitation refrigeration equipment. It mainly maintains the compressor motor bearing in a magnetic levitation state through the cooperation of permanent magnets and electromagnets, so that the device can operate without wear, effectively extending the service life of the device.

[0003] However, the existing magnetic suspension centrifugal compressor has the following problems: 1. When the magnetic levitation centrifugal compressor is powered off or the current and voltage are unstable, the magnetic force provided by the radial magnetic levitation bearing and the axial thrust bearing to the rotating shaft is not enough to keep the rotating shaft in a suspended state, causing the rotating shaft to hit the protective bearing, making the protective bearing easily damaged.

[0004] 2. In the existing magnetic levitation centrifugal compressor, when the stator of the centrifuge is in a suspended state and is affected by magnetic force, the stator can move inside the magnetic levitation box, resulting in insufficient sealing between the stator and the inside of the magnetic levitation box, thereby causing air to enter the magnetic levitation equipment. The moisture in the air comes into contact with the internal parts of the magnetic levitation equipment, causing the moisture to corrode the parts, and the corrosion reduces the service life of the magnetic levitation equipment. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an energy-saving magnetically suspended centrifugal compressor, which solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an energy-saving magnetic suspension centrifugal compressor, comprising a heat exchanger, a compressor body and a rotor shaft, wherein the rotor shaft drives the compressor body and acts on the heat exchanger, and further comprises two sets of magnetic suspension components, a retaining component and a gas support component, wherein the two ends of the rotor shaft outside the motor are respectively connected to the magnetic suspension component and the retaining component, and one end thereof passes through the magnetic suspension component and the retaining component and then is connected to the compressor body; The magnetic levitation assembly includes a magnetic levitation shell and a concentric disk. The concentric disk is suspended in the magnetic levitation shell. The rotor shaft is fixed through the center position of the concentric disk. The outer ring of the concentric disk is provided with a plurality of permanent magnets distributed at equal distances. The concentric disks of the permanent magnets are hinged. The side of the permanent magnet away from the concentric disk is an arc surface structure. The hinge direction of the permanent magnet and the concentric disk is parallel to the main axis direction of the concentric disk. The outer ring of the magnetic levitation shell is fixedly installed with a plurality of electromagnets distributed at equal distances. The magnetic end of the electromagnet is in the magnetic levitation shell and corresponds to the permanent magnet.

[0007] Preferably, the gas support assembly includes a gas nozzle, a central ring tube and a gas supply pipe. The gas nozzle is fixedly mounted on the magnetic levitation shell. One end of the gas nozzle extends into the magnetic levitation shell. The number of gas nozzles is the same as the electromagnets, and any gas nozzle is located between two adjacent electromagnets. Any gas nozzle is fixed and connected to the central ring tube by a bent pipe, and the gas supply pipe is fixed and connected to the central ring tube.

[0008] Preferably, the middle thickness of the concentric disk is greater than the edge thickness, and a circle of equidistantly distributed airways are provided on both sides of the concentric disk. The airways are equidistantly distributed, and the ends of the airways that are away from each other penetrate the edge ends of the concentric disk, and the ends of the airways that are close to each other are inclined and converge toward the center of the concentric disk. The airways extend toward the center of the concentric disk and their depth becomes shallower and shallower.

[0009] Preferably, wind guide covers are fixedly installed on both ends of the left and right ends of the magnetic levitation shell. The wind guide covers are divided into a two-section structure. The wind guide covers are divided into two sections that are fixed to each other. The first section is fixed to the magnetic levitation shell. The diameter of the first section gradually decreases after it moves away from the magnetic levitation shell, and the diameter of the other section gradually increases after it moves away from the first section. The two sections are connected at the centers of the fixed positions to form a narrow structure, and there is an annular gap between the rotor shaft and the narrow opening for gas to pass through.

[0010] Preferably, the outer ring of the concentric disk is provided with a plurality of grooves, the permanent magnet is arranged in the grooves, there is no contact between the permanent magnet and the grooves, the permanent magnet comprises a metal seat and a magnetic sheet, the metal seat is hinged to the concentric disk, and the magnetic sheet is fixed to the side of the metal seat outside the groove.

[0011] Preferably, the retaining assembly includes a retainer housing, a bearing and an end cover, two end covers are provided, which are respectively fixed on the left and right ends of the retainer housing, the rotor shaft passes through the two end covers and the retainer housing, and there is an annular gap between the rotor shaft and the end cover for gas to pass through, the bearing is suspended in the center of the retainer housing, the inner ring of the bearing is fixedly mounted on the rotor shaft, the outer ring of the bearing is fixedly sleeved with a multi-plane rubber pad, three electric push rods are fixedly mounted on the outside of the retainer housing, the output ends of the electric push rods are located in the retainer housing, and the output ends of the electric push rods are fixedly mounted with rubber heads, which extend together and clamp the bearing when the electric push rods are energized.

[0012] Preferably, one end of the air guide cover away from the magnetic suspension housing is fixed to one of the end covers, and the internal cavities of the two are connected.

[0013] Preferably, a base is fixedly mounted on the heat exchanger, the magnetic suspension housing and the retainer housing are both fixedly mounted on the base, and the motor housing and the compressor body are both fixedly mounted on the base.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The energy-saving magnetic levitation centrifugal compressor is provided with a retaining component, a magnetic levitation component and a gas support component. After all the electromagnets are energized, the current of each electromagnet is adjusted according to the computer to exert a repulsive force on the permanent magnet, so that the concentric disk is suspended relative to the magnetic levitation shell. In the early stage, high-pressure gas can be introduced into the magnetic levitation shell through a gas nozzle, and the concentric disk is supported by the gas, and then combined with magnetic levitation, so that the equipment can also suspend the rotor shaft when the current is unstable. At the same time, when the current is unstable, the electric push rod can be energized to extend and clamp the bearing. After clamping the bearing, it does not affect the rotation of the rotor shaft, but can stabilize the rotor shaft. Therefore, when the power is off, just started or the voltage is unstable, the rotor shaft can be kept concentric or suspended, and the rotor and bearing can be protected from damage.

[0015] 2. This energy-saving magnetic levitation centrifugal compressor is equipped with a gas support assembly. When the rotor shaft is unstable or loses suspension, the gas supply pipe supplies high-pressure gas. The high-pressure gas can stabilize the concentric disk and keep the rotor shaft suspended. It can also discharge excess gas from the concentric disk, thereby cooling the motor casing and preventing moist gas or dust from entering the magnetic suspension position of the rotor shaft.

[0016] 3. The energy-saving magnetic levitation centrifugal compressor is provided with movable permanent magnets. When the electromagnet releases the mutual repulsion between the electromagnet and the permanent magnet, since the permanent magnet has a certain swing amplitude but cannot rotate completely, any permanent magnet has a certain buffer adjustment amount. Therefore, when all the electromagnets jointly exert repulsion, the concentric disk magnetic levitation is more stable, and even when one of the electromagnets is unstable, stable high-speed operation can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a front view of the structure of the present invention; Figure 3 It is a partial structural schematic diagram of the present invention; Figure 4 It is a structural diagram of the magnetic suspension assembly and the clamping assembly of the present invention; Figure 5A top view of the structure of the magnetic suspension assembly of the present invention; Figure 6 A top cross-sectional view of the magnetic suspension assembly of the present invention; Figure 7 It is an axial cross-sectional view of the magnetic suspension assembly of the present invention; Figure 8 is a cross-sectional view of the clamping assembly of the present invention; Fig. 9 It is the internal structure diagram of the magnetic suspension assembly and the clamping assembly of the present invention; Fig.10 It is a structural schematic diagram of the concentric disk of the present invention.

[0018] In the figure: 1. heat exchanger; 2. compressor body; 3. rotor shaft; 4. magnetic suspension assembly; 401. magnetic suspension housing; 402. concentric disk; 403. permanent magnet; 4031. metal seat; 4032. magnetic sheet; 404. electromagnet; 405. air duct; 406. wind guide cover; 407. groove; 5. retaining assembly; 501. retainer housing; 502. bearing; 503. end cover; 504. flat rubber pad; 505. electric push rod; 6. gas support assembly; 601. gas nozzle; 602. central ring pipe; 603. gas supply pipe; 604. elbow; 7. base. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0023] like Figure 1-10 As shown, an energy-saving magnetic levitation centrifugal compressor includes a heat exchanger 1, a compressor body 2 and a rotor shaft 3. The rotor shaft 3 drives the compressor body 2 and acts on the heat exchanger 1. It also includes two groups of magnetic levitation components 4, a retaining component 5 and a gas support component 6. The two ends of the rotor shaft 3 outside the motor are respectively connected to the magnetic levitation component 4 and the retaining component 5, and one end passes through the magnetic levitation component 4 and the retaining component 5 and then connects to the compressor body 2.

[0024] The magnetic levitation component 4 includes a magnetic levitation shell 401 and a concentric disk 402. The concentric disk 402 is suspended in the magnetic levitation shell 401. The rotor shaft 3 is fixed through the center position of the concentric disk 402. The outer ring of the concentric disk 402 is provided with a plurality of permanent magnets 403 distributed at equal distances. The concentric disk 402 of the permanent magnet 403 is hinged. The side of the permanent magnet 403 away from the concentric disk 402 is a curved surface structure. The hinge direction of the permanent magnet 403 and the concentric disk 402 is parallel to the main axis direction of the concentric disk 402. The outer ring of the magnetic levitation shell 401 is fixedly installed with a plurality of electromagnets 404 distributed at equal distances. The magnetic end of the electromagnet 404 is in the magnetic levitation shell 401 and corresponds to the permanent magnet 403.

[0025] The compressor body 2 is a centrifugal compression part, which includes an impeller: it rotates at high speed, accelerates the gas and increases kinetic energy. Diffuser: it converts the kinetic energy of the gas into pressure energy. Volute: it collects the compressed gas and guides it to the outlet. The motor is a high-speed motor, which is used to drive the rotor shaft 3 to rotate, and the speed can reach tens of thousands of revolutions per minute. The equipment also includes a frequency converter: it adjusts the motor speed and optimizes the performance. The control system: it is used to adjust the electromagnetic force of the electromagnet 404 to ensure stable suspension; the position sensor: it monitors the rotor position in real time and feeds back to the control system and various magnetic bearings. The gas cooler: it reduces the temperature of the compressed gas to prevent overheating. The bearing cooling system: it cools the magnetic suspension bearing to prevent high temperature failure. The gas seal: it prevents gas leakage and ensures efficiency. The shaft seal: it isolates the compression chamber from the external environment. PLC / DCS: it realizes automatic control and monitoring. The sensor network: it monitors parameters such as temperature, pressure, and vibration. The fault diagnosis system: it analyzes the operating status in real time and warns of potential faults. The lubrication system: it provides lubrication for traditional bearings (partial design). The filter system: it filters impurities in the gas to protect the equipment.

[0026] The concentric disk 402 is a solid metal disk with a certain rotational inertia, and the rotor shaft 3 is stably fixed to the concentric disk 402 .

[0027] Electromagnet 404 is a pure electromagnet, relying only on the electromagnetic coil, with more flexible control, rated power of 500W, cooling form can use natural cooling or external forced cooling, protection level is usually IP54 or higher, to ensure stable operation in harsh environment.

[0028] The gas support assembly 6 includes a gas nozzle 601, a central ring tube 602 and a gas supply pipe 603. The gas nozzle 601 is fixedly mounted on the magnetic levitation housing 401. One end of the gas nozzle 601 extends into the magnetic levitation housing 401. The number of the gas nozzles 601 is the same as the electromagnets 404, and any gas nozzle 601 is located between two adjacent electromagnets 404. Any gas nozzle 601 is fixed and connected to the central ring tube 602 by a bent pipe 604, and the gas supply pipe 603 is fixed and connected to the central ring tube 602.

[0029] The outer end of the gas supply pipe 603 is connected to the pneumatic module through a pipeline, which is used to supply high-pressure gas to the central ring pipe 602. An electromagnetic gas valve is installed at the connection between the gas supply pipe 603 and the central ring pipe 602. The opening and closing is controlled by a computer signal, and the central ring pipe 602 of the box can be opened instantly to apply high-pressure gas.

[0030] One end of the gas nozzle 601 acting in the magnetic suspension housing 401 is a gas jet port, and the gas pressure applied is sufficient to push the concentric disk 402 to move.

[0031] The middle thickness of the concentric disk 402 is greater than the edge thickness. A circle of equally spaced air passages 405 are provided on both sides of the concentric disk 402. The air passages 405 are equally spaced. The ends of the air passages 405 that are away from each other penetrate the edge ends of the concentric disk 402. The ends of the air passages 405 that are close to each other are inclined and converge toward the center of the concentric disk 402. The air passages 405 extend toward the center of the concentric disk 402 and their depth becomes increasingly shallow.

[0032] When the high-pressure gas is discharged from the magnetic suspension housing 401, it will be discharged along the airway 405, so the high-pressure gas can also assist the electromagnet 404 in supporting the concentric disk 402 to suspend, and the gas discharged from the airway 405 has a faster flow rate.

[0033] Wind guide covers 406 are fixedly installed at both ends of the magnetic levitation shell 401. The wind guide covers 406 are divided into two sections of fixed structures. The first section is fixed to the magnetic levitation shell 401. The diameter of the first section gradually decreases after it moves away from the magnetic levitation shell 401, and the diameter of the other section gradually increases after it moves away from the first section. The two sections are fixed to each other at the center and form a narrow structure. There is an annular gap between the rotor shaft 3 and the narrow opening for gas to pass through.

[0034] The gas with an ultra-fast flow rate will be discharged through the wind guide cover 406. The narrow mouth structure can increase the air flow rate, and the gas flowing out of the annular gap can also help keep the rotor shaft 3 suspended. The high-pressure gas flowing outward can minimize the entry of external dust into the magnetic suspension device.

[0035] The outer ring of the concentric disk 402 is provided with a plurality of grooves 407 , and the permanent magnet 403 is arranged in the groove 407 . The permanent magnet 403 and the groove 407 do not contact each other. The permanent magnet 403 includes a metal seat 4031 and a magnetic sheet 4032 . The metal seat 4031 is hinged to the concentric disk 402 , and the magnetic sheet 4032 is fixed on the side of the metal seat 4031 outside the groove 407 .

[0036] The magnetic sheet 4032 can be made of high-performance permanent magnetic materials such as neodymium iron boron (NdFeB) and samarium cobalt (SmCo). The static magnetic field provided by the magnetic sheet 4032 can reduce the energy consumption of the electromagnet 404. The metal seat 4031 is made of aluminum alloy, and is provided with a wear-resistant small shaft, each of which is connected to the concentric disk 402 by a micro bearing.

[0037] The retaining assembly 5 includes a retainer housing 501, a bearing 502 and an end cover 503. Two end covers 503 are provided, which are fixed on the left and right ends of the retainer housing 501 respectively. The rotor shaft 3 passes through the two end covers 503 and the retainer housing 501. There is an annular gap between the rotor shaft 3 and the end cover 503 for gas to pass through. The bearing 502 is suspended in the center of the retainer housing 501. The inner ring of the bearing 502 is fixedly installed on the rotor shaft 3. The outer ring of the bearing 502 is fixedly sleeved with a multi-plane rubber pad 504. Three electric push rods 505 are fixedly installed on the outside of the retainer housing 501. The output ends of the electric push rods 505 are located in the retainer housing 501. The output ends of the electric push rods 505 are fixedly installed with rubber heads. When the electric push rods 505 are energized, they extend together and clamp the bearing 502.

[0038] Bearing 502 is a lightweight bearing, preferably made of titanium alloy, such as Ti-6Al-4V, which has high strength and light weight and is suitable for high-load scenarios. Depending on the budget, lightweight steel can also be selected, that is, high-strength, low-density steel is developed through alloying or heat treatment processes.

[0039] The flat rubber pad 504 is a rubber ring, which is fixedly adhered to the outer ring of the bearing 502 by chemical glue, and can quickly stabilize the bearing 502 when clamping.

[0040] Selecting lightweight bearings can reduce the gravity burden on the rotor shaft 3 after it is suspended, thereby breaking through the speed limit of the rotor shaft 3 when the rotor shaft 3 is suspended and rotates at high speed.

[0041] One end of the air guide cover 406 away from the magnetic suspension housing 401 is fixed to one of the end covers 503, and the internal cavities of the two are in communication.

[0042] The air guide cover 406 is made of aluminum alloy and is used to reduce the wind resistance of the high-pressure gas flow. After the high-pressure gas is discharged from the air guide cover 406, it can enter the retainer housing 501 to cool the bearing 502 or provide further support.

[0043] A base 7 is fixedly mounted on the heat exchanger 1 , the magnetic suspension housing 401 and the retainer housing 501 are both fixedly mounted on the base 7 , and the motor housing and the compressor body 2 are both fixedly mounted on the base 7 .

[0044] When in use, after all the electromagnets 404 are energized, the current of each electromagnet 404 is adjusted according to the computer to exert a repulsive force on the permanent magnet 403, so that the concentric disk 402 is suspended relative to the magnetic suspension housing 401. When the electromagnet 404 releases the mutual repulsive force with the permanent magnet 403, since the permanent magnet 403 has a certain swing amplitude but cannot rotate completely, any permanent magnet 403 has a certain buffer adjustment amount. Therefore, when all the electromagnets 404 exert a repulsive force together, the magnetic suspension of the concentric disk 402 is more stable, and even in the case of instability of one of the electromagnets 404, stable high-speed operation can be maintained; When the power is off, just started or the voltage is unstable, high-pressure gas can be introduced into the magnetic suspension housing 401 through the gas nozzle 601, and the concentric disk 402 can be supported by the gas, and combined with magnetic suspension, the device can also suspend the rotor shaft 3 when the current is unstable. At the same time, when the current is unstable, the electric push rod 505 can be intermittently energized to stretch and clamp the bearing 502. After clamping the bearing 502, it does not affect the rotation of the rotor shaft 3, but can stabilize the rotor shaft 3. When the rotor shaft 3 is stable, the clamping of the electric push rod 505 is released, which does not affect the rotation speed of the rotor shaft 3. When the rotor shaft 3 is in an unstable state or loses suspension, the gas supply pipe 603 supplies high-pressure gas. The high-pressure gas can stabilize the concentric disk 402 to keep the rotor shaft 3 suspended, and can also discharge excess gas from the concentric disk 402, which not only cools the motor casing, but also cleans the rotor shaft 3 through the wind guide cover 406, preventing humid gas or dust from entering the magnetic suspension position of the rotor shaft 3.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0046] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving magnetically suspended centrifugal compressor, comprising a heat exchanger (1), a compressor body (2) and a rotor shaft (3), wherein the rotor shaft (3) drives the compressor body (2) and acts on the heat exchanger (1), and is characterized in that: It also includes two groups of magnetic suspension components (4), a retaining component (5) and a gas support component (6), wherein the two ends of the rotor shaft (3) outside the motor are respectively connected to the magnetic suspension component (4) and the retaining component (5), and one end thereof passes through the magnetic suspension component (4) and the retaining component (5) and is then connected to the compressor body (2); The magnetic suspension component (4) comprises a magnetic suspension housing (401) and a concentric disk (402); the concentric disk (402) is suspended in the magnetic suspension housing (401); the rotor shaft (3) is fixedly passed through the center of the concentric disk (402); the outer ring of the concentric disk (402) is provided with a plurality of permanent magnets (403) distributed at equal distances; the concentric disk (402) of the permanent magnet (403) is hinged; a side of the permanent magnet (403) away from the concentric disk (402) is a curved surface structure; the hinge direction of the permanent magnet (403) and the concentric disk (402) is parallel to the main axis direction of the concentric disk (402); the outer ring of the magnetic suspension housing (401) is fixedly provided with a plurality of electromagnets (404) distributed at equal distances; the magnetic ends of the electromagnets (404) are located in the magnetic suspension housing (401) and correspond to the permanent magnets (403).

2. The energy-saving magnetic suspension centrifugal compressor according to claim 1 is characterized in that: The gas support assembly (6) comprises a gas nozzle (601), a central ring tube (602) and a gas supply pipe (603); the gas nozzle (601) is fixedly mounted on the magnetic suspension housing (401); one end of the gas nozzle (601) extends into the magnetic suspension housing (401); the number of the gas nozzles (601) is the same as the number of the electromagnets (404); any gas nozzle (601) is located between two adjacent electromagnets (404); any gas nozzle (601) is fixed and connected to the central ring tube (602) by a bent tube (604); and the gas supply pipe (603) is fixed and connected to the central ring tube (602).

3. The energy-saving magnetic suspension centrifugal compressor according to claim 2 is characterized in that: The middle thickness of the concentric disk (402) is greater than the edge thickness. A circle of air channels (405) distributed at equal distances are provided on both sides of the concentric disk (402). The air channels (405) are distributed at equal distances. The ends of the air channels (405) that are away from each other penetrate the edge ends of the concentric disk (402), and the ends of the air channels (405) that are close to each other are inclined and gathered toward the center of the concentric disk (402). The depth of the air channels (405) becomes shallower and shallower as they extend toward the center of the concentric disk (402).

4. The energy-saving magnetic suspension centrifugal compressor according to claim 3 is characterized in that: The left and right ends of the magnetic suspension housing (401) are both fixedly mounted with an air guide cover (406), the air guide cover (406) being divided into two sections of a structure fixed to each other, the first section being fixed to the magnetic suspension housing (401), the diameter of the first section gradually decreasing as it moves away from the magnetic suspension housing (401), and the diameter of the other section gradually increasing as it moves away from the first section, the two sections being connected at their fixed positions at the center to form a narrow opening structure, and an annular gap for gas to pass through is provided between the rotor shaft (3) and the narrow opening.

5. The energy-saving magnetic suspension centrifugal compressor according to claim 4 is characterized in that: The outer ring of the concentric disk (402) is provided with a plurality of grooves (407), the permanent magnet (403) is arranged in the groove (407), the permanent magnet (403) and the groove (407) are not in contact with each other, the permanent magnet (403) comprises a metal seat (4031) and a magnetic sheet (4032), the metal seat (4031) is hinged to the concentric disk (402), and the magnetic sheet (4032) is fixed to a side of the metal seat (4031) that is outside the groove (407).

6. The energy-saving magnetic suspension centrifugal compressor according to claim 5, characterized in that: The retaining assembly (5) comprises a retainer housing (501), a bearing (502) and an end cover (503), wherein two end covers (503) are provided and are fixed to the left and right ends of the retainer housing (501), respectively; the rotor shaft (3) passes through the two end covers (503) and the retainer housing (501); an annular gap for gas to pass through exists between the rotor shaft (3) and the end cover (503); the bearing (502) is suspended in the center of the retainer housing (501); the inner ring of the bearing (502) is fixedly mounted on the rotor shaft (3); the outer ring of the bearing (502) is fixedly sleeved with a multi-plane rubber pad (504); three electric push rods (505) are fixedly mounted on the outside of the retainer housing (501); the output ends of the electric push rods (505) are located in the retainer housing (501); the output ends of the electric push rods (505) are fixedly mounted with rubber heads; when the electric push rods (505) are energized, they extend together and clamp the bearing (502).

7. The energy-saving magnetic suspension centrifugal compressor according to claim 6, characterized in that: One end of the wind guide cover (406) away from the magnetic suspension housing (401) is fixed to one of the end covers (503), and the internal cavities of the two are in communication.

8. The energy-saving magnetic suspension centrifugal compressor according to claim 7, characterized in that: The heat exchanger (1) is fixedly mounted with a base (7), the magnetic suspension housing (401) and the retainer housing (501) are both fixedly mounted on the base (7), and the motor housing and the compressor body (2) are both fixedly mounted on the base (7).

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