Two-stage compression system of magnetically suspended centrifugal air compressor

Abstract

The present application relates to a two-stage compression system of a magnetic levitation centrifugal air compressor, wherein the system includes a first compression assembly, a motor, a magnetic levitation bearing assembly, a second compression assembly, a controller, a first cooling circulation subsystem and a second cooling circulation subsystem; the motor includes a motor cooling mechanism, a motor main shaft and a motor stator sleeved on the motor main shaft; the magnetic levitation bearing assembly is sleeved on both sides of the motor main shaft; the second compression control port is mechanically connected to the second end of the motor main shaft; the controller is electrically connected to the magnetic levitation bearing assembly; the first cooling circulation subsystem is cyclically connected to the motor cooling mechanism; the second cooling circulation subsystem is connected between the first exhaust port and the second air inlet, so as to realize the two-stage compression of the external input gas. The present application can realize an oil-free compression process, avoid pollution, and has low noise, thereby improving the compression energy efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a two-stage compression system of a magnetically suspended centrifugal air compressor. Background Art

[0002] Air compressors are basic products of industrial modernization. Air compressors are used to provide air source power. They are the core equipment of pneumatic systems and the main body of electromechanical air source devices. They are devices that convert the mechanical energy of the prime mover (usually an electric motor) into gas pressure energy. They are air pressure generating devices for compressed air. The compression methods of air compressors can include primary compression and secondary compression. The air pressure generated by secondary compression is high, and the service life of secondary compression is longer than that of primary compression at the same pressure. The energy consumption of secondary compression is higher at the same pressure and the same gas output, but the wear is smaller. At present, compressors using the secondary compression method are usually twin-screw two-stage compression air compressor systems, but the traditional twin-screw two-stage compression air compressor system needs to use lubricating oil during the compression process, which is easy to cause pollution, and has high noise and low compression efficiency.

[0003] During the implementation process, the inventors found that there are at least the following problems in the traditional technology: the traditional twin-screw two-stage compression air compressor system needs to use lubricating oil during the compression process, which is easy to cause pollution, has high noise and low compression efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide a magnetic levitation centrifugal air compressor two-stage compression system to address the problems that the traditional twin-screw two-stage compression air compressor system needs to use lubricating oil during the compression process, which is easy to cause pollution, has high noise and low compression efficiency.

[0005] In order to achieve the above object, an embodiment of the present invention provides a two-stage compression system of a magnetically suspended centrifugal air compressor, comprising:

[0006] A first compression assembly, the first compression assembly comprising a first air inlet, a first air outlet and a first compression control port; the first air inlet is used to receive external gas;

[0007] The motor includes a motor cooling mechanism, a motor main shaft, and a motor stator sleeved on the motor main shaft; a first end of the motor main shaft is mechanically connected to a first compression control port;

[0008] A magnetic bearing assembly is sleeved on both sides of the motor main shaft;

[0009] A second compression assembly, the second compression assembly comprising a second air inlet, a second exhaust port and a second compression control port; the second compression control port is mechanically connected to the second end of the motor main shaft; the second exhaust port is used to discharge the secondary compressed gas;

[0010] A controller electrically connected to the magnetic bearing assembly;

[0011] A first cooling circulation subsystem, the first cooling circulation subsystem is cyclically connected with the motor cooling mechanism;

[0012] The second cooling circulation subsystem, the input end of the second cooling circulation subsystem is connected through the first exhaust port; the output end of the second cooling circulation subsystem is connected through the second air inlet.

[0013] In one of the embodiments, it also includes a gas filter connected to the first gas inlet.

[0014] In one embodiment, the first cooling cycle subsystem includes a pump, a thermostatic valve and a heat exchanger;

[0015] The input end of the pump is connected to the first end of the thermostatic valve, and the output end is connected to the inlet of the motor cooling mechanism; the second end of the thermostatic valve is connected to the output end of the heat exchanger; the discharge port of the motor cooling mechanism is connected to the input end of the heat exchanger; the third end of the thermostatic valve is connected between the discharge port of the motor cooling mechanism and the input end of the heat exchanger.

[0016] In one embodiment, it further includes a frequency converter electrically connected to the motor, and a frequency converter cooling mechanism for cooling the frequency converter;

[0017] The inverter cooling mechanism is connected between the discharge port of the motor cooling mechanism and the input end of the heat exchanger.

[0018] In one of the embodiments, the second cooling cycle subsystem includes a first cooler;

[0019] The input end of the first cooler is connected to the first exhaust port, and the output end is connected to the second intake port.

[0020] In one of the embodiments, a third cooling cycle subsystem is also included;

[0021] The input end of the third cooling circulation subsystem is connected to the second exhaust port; the output end of the third cooling circulation subsystem is used to discharge the cooled secondary compressed gas.

[0022] In one of the embodiments, the third cooling cycle subsystem includes a second cooler;

[0023] The input end of the second cooler is connected to the second exhaust port, and the output end is used to discharge the cooled secondary compressed gas.

[0024] In one of the embodiments, it also includes a speed regulating valve;

[0025] The speed regulating valve is connected between the second exhaust port and the input end of the second cooler.

[0026] In one embodiment, the magnetic bearing assembly includes a first radial magnetic bearing disposed at a first end of the motor shaft, and a second radial magnetic bearing disposed at a second end of the motor shaft;

[0027] The first radial magnetic bearing is electrically connected to the controller; the second radial magnetic bearing is electrically connected to the controller.

[0028] In one of the embodiments, the magnetic bearing assembly further includes an axial magnetic bearing disposed on the motor main shaft;

[0029] The axial magnetic bearing is electrically connected to the controller.

[0030] One of the above technical solutions has the following advantages and beneficial effects:

[0031] In each embodiment of the above-mentioned magnetic levitation centrifugal air compressor two-stage compression system, the first compression component includes a first air inlet, a first exhaust port and a first compression control port; the first air inlet is used to connect to external gas; the motor includes a motor cooling mechanism, a motor main shaft and a motor stator sleeved on the motor main shaft; the first end of the motor main shaft is mechanically connected to the first compression control port; the magnetic levitation bearing assembly is sleeved on both sides of the motor main shaft; the second compression component includes a second air inlet, a second exhaust port and a second compression control port; the second compression control port is mechanically connected to the second end of the motor main shaft; the second exhaust port is used to discharge the secondary compressed gas; the controller is electrically connected to the magnetic levitation bearing assembly; the first cooling circulation subsystem is cyclically connected to the motor cooling mechanism; the input end of the second cooling circulation subsystem is connected to the first exhaust port; the output end of the second cooling circulation subsystem is connected to the second air inlet, so as to realize the two-stage compression of the external input gas. The present application maintains the suspension of the motor main shaft through a magnetic bearing assembly, thereby realizing the suspension and rotation of the motor main shaft, driving the first compression assembly and the second compression assembly to work respectively, and the external gas is respectively output after the primary compression of the first compression assembly and the secondary compression of the second compression assembly, realizing an oil-free compression process, avoiding pollution, and having low noise. The motor is cooled by the first cooling circulation subsystem, the gas after the primary compression is cooled by the second cooling circulation subsystem, and the cooled gas is transmitted back to the second compression assembly for secondary compression, thereby improving the compression energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A first structural schematic diagram of a two-stage compression system of a magnetically suspended centrifugal air compressor in one embodiment;

[0033] Figure 2 A second structural schematic diagram of a two-stage compression system of a magnetically suspended centrifugal air compressor in one embodiment;

[0034] Figure 3is a first structural schematic diagram of a first cooling circulation subsystem in one embodiment;

[0035] Figure 4 A third structural schematic diagram of a two-stage compression system of a magnetically suspended centrifugal air compressor in one embodiment;

[0036] Figure 5 A fourth structural schematic diagram of a two-stage compression system of a magnetically suspended centrifugal air compressor in one embodiment;

[0037] Figure 6 Schematic diagram of the structure of a magnetic bearing assembly in one embodiment. DETAILED DESCRIPTION

[0038] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0040] In order to solve the problem that the traditional twin-screw two-stage compression air compressor system needs to use lubricating oil during compression, which is easy to cause pollution, has high noise and low compression efficiency. In one embodiment, Figure 1 As shown, a magnetic suspension centrifugal air compressor two-stage compression system is provided, the system comprising:

[0041] A first compression assembly 110, the first compression assembly 110 comprises a first air inlet, a first air outlet and a first compression control port; the first air inlet is used to receive external gas;

[0042] The motor 120 includes a motor cooling mechanism 122, a motor main shaft 124, and a motor stator 126 sleeved on the motor main shaft 124; a first end of the motor main shaft 124 is mechanically connected to a first compression control port;

[0043] A magnetic bearing assembly 130, wherein the magnetic bearing assembly 130 is sleeved on both sides of the motor main shaft 124;

[0044] A second compression assembly 140, the second compression assembly 140 comprises a second air inlet, a second exhaust port and a second compression control port; the second compression control port is mechanically connected to the second end of the motor main shaft 124; the second exhaust port is used to discharge the secondary compressed gas;

[0045] A controller 150 , the controller 150 is electrically connected to the magnetic bearing assembly 130 ;

[0046] A first cooling circulation subsystem 160, the first cooling circulation subsystem 160 is cyclically connected with the motor cooling mechanism 122;

[0047] The second cooling circulation subsystem 170, the input end of the second cooling circulation subsystem 170 is connected through the first exhaust port; the output end of the second cooling circulation subsystem 170 is connected through the second air inlet.

[0048] Among them, the first compression assembly 110 can be used to compress external input gas. The first compression assembly 110 may include a first compression chamber, and the first compression chamber is provided with a first impeller mechanically connected to the motor main shaft 124. In one example, external gas enters the first compression chamber through the first air inlet of the first compression assembly 110, and the motor main shaft 124 rotates to drive the first impeller to rotate, so that the compressed gas input into the first compression chamber is compressed, and the gas after the first stage of compression is output through the first exhaust port. It should be noted that the motor main shaft 124 can be mechanically connected to the first impeller through the first compression control port of the first compression assembly.

[0049] The motor 120 may be a permanent magnet synchronous motor. In one example, the motor 120 may be a permanent magnet direct drive high-speed motor. The motor cooling mechanism 122 is used to cool the motor 120. In one example, the motor cooling mechanism 122 may include a flow channel for transmitting coolant, and the coolant is transmitted in the flow channel for motor cooling to carry away the heat of the motor, thereby achieving cooling of the motor 120. The motor spindle 124 refers to the rotating part in the motor. The motor stator 126 may be the stationary part of the motor. The motor stator 126 may be composed of three parts: a stator core, a stator winding and a frame. The main function of the motor stator 126 is to generate a rotating magnetic field so that the motor spindle rotates.

[0050] The magnetic bearing assembly 130 refers to a bearing assembly that can generate magnetic force through the principle of electromagnetic induction. The magnetic bearing assembly 130 can be used to maintain the motor spindle 124 suspended. When the magnetic bearing assembly 130 maintains the motor spindle 124 suspended, the magnetic bearing assembly 130 and the motor spindle 124 are not in contact, and no lubricating oil needs to be added.

[0051] The second compression assembly 140 can be used to compress the primary compressed gas transmitted by the first compression assembly 110. The second compression assembly 140 may include a second compression chamber, and a second impeller mechanically connected to the motor main shaft 124 is provided in the second compression chamber. In one example, the primary compressed gas enters the second compression chamber through the second air inlet of the second compression assembly 140, and the motor main shaft 124 rotates to drive the second impeller to rotate, so that the compressed gas input into the second compression chamber is compressed, and the gas after the secondary compression is output through the second exhaust port. It should be noted that the motor main shaft 124 can be mechanically connected to the second impeller through the second compression control port of the second compression assembly.

[0052] The controller 150 may be used to control the magnetic bearing assembly 130 so that the magnetic bearing assembly 130 maintains the motor shaft 124 suspended. In one example, the controller 150 may be a PLC controller.

[0053] The first cooling circulation subsystem 160 can be used to cool the motor 120. The first cooling circulation subsystem 160 can be connected to the motor cooling mechanism 122 through a coolant transmission channel. The second cooling circulation subsystem 170 can be used to cool the primary compressed gas output by the first compression assembly 110. The second cooling circulation subsystem 170 can be connected to the first exhaust port of the first compression assembly 110 and the second air inlet of the second compression assembly 110 through a coolant transmission channel.

[0054] Specifically, the system is powered on and started, and the controller 150 controls the operation of the magnetic bearing assembly 130, and the magnetic bearing assembly 130 generates magnetic force to maintain the motor main shaft 124 suspended. The motor main shaft 124 rotates and drives the first compression assembly 110 and the second compression assembly 140 to work respectively. When external gas enters the first compression assembly 110, the first compression assembly 110 performs primary compression on the external gas, and the compressed gas flows into the second cooling circulation subsystem 170 through a pipeline. The second cooling circulation subsystem 170 cools the gas after primary compression and transmits the cooled compressed gas to the second compression assembly 170. The second compression assembly 170 performs secondary compression on the cooled compressed gas, and then outputs the secondary compressed gas, thereby realizing highly efficient and energy-saving compressed gas.

[0055] Furthermore, based on the circular through-connection between the first cooling circulation subsystem 160 and the motor cooling mechanism 122, coolant can be poured into the first cooling circulation subsystem 160. The coolant circulates in the motor cooling mechanism 122 to take away the heat generated by the motor 120, thereby cooling the motor 120 and preventing the motor from overheating and causing malfunctions when the system is working.

[0056] In the embodiment of the above-mentioned magnetic levitation centrifugal air compressor two-stage compression system, the first compression component includes a first air inlet, a first exhaust port and a first compression control port; the first air inlet is used to connect to external gas; the motor includes a motor cooling mechanism, a motor main shaft and a motor stator sleeved on the motor main shaft; the first end of the motor main shaft is mechanically connected to the first compression control port; the magnetic levitation bearing assembly is sleeved on both sides of the motor main shaft; the second compression component includes a second air inlet, a second exhaust port and a second compression control port; the second compression control port is mechanically connected to the second end of the motor main shaft; the second exhaust port is used to discharge the secondary compressed gas; the controller is electrically connected to the magnetic levitation bearing assembly; the first cooling circulation subsystem is cyclically connected to the motor cooling mechanism; the input end of the second cooling circulation subsystem is connected to the first exhaust port; the output end of the second cooling circulation subsystem is connected to the second air inlet, so as to realize the two-stage compression of the external input gas. The motor main shaft is kept suspended by the magnetic bearing assembly, thereby realizing the suspended rotation of the motor main shaft, driving the first compression assembly and the second compression assembly to work respectively. The external gas is respectively compressed by the first compression assembly and the second compression assembly and then output, realizing an oil-free compression process, avoiding pollution, and having low noise. The motor is cooled by the first cooling circulation subsystem, and the gas after the first compression is cooled by the second cooling circulation subsystem, and the cooled gas is transmitted back to the second compression assembly for the second compression, thereby improving the compression energy efficiency.

[0057] In one embodiment, Figure 2 As shown, a two-stage compression system of a magnetic suspension centrifugal air compressor is provided, which includes a first compression assembly 210, a motor 220, a magnetic suspension bearing assembly 230, a second compression assembly 240, a controller 250, a first cooling circulation subsystem 260 and a second cooling circulation subsystem 270; wherein the first compression assembly 210 includes a first air inlet, a first exhaust port and a first compression control port; the first air inlet is used to connect external air; the motor 220 includes a motor cooling mechanism 222, a motor main shaft 224 and a motor stator 226 sleeved on the motor main shaft 224; the first end of the motor main shaft 224 is mechanically Connected to the first compression control port; the magnetic suspension bearing assembly 230 is sleeved on both sides of the motor main shaft 224; the second compression assembly 240 includes a second air inlet, a second exhaust port and a second compression control port; the second compression control port is mechanically connected to the second end of the motor main shaft 224; the second exhaust port is used to discharge the secondary compressed gas; the controller 250 is electrically connected to the magnetic suspension bearing assembly 230; the first cooling circulation subsystem 260 is cyclically connected with the motor cooling mechanism 222; the input end of the second cooling circulation subsystem 270 is connected to the first exhaust port; the output end of the second cooling circulation subsystem 270 is connected to the second air inlet. The system also includes a gas filter 280 connected to the first air inlet.

[0058] The gas filter 280 may be used to filter impurities such as particles in the external gas input into the first compression assembly 210. In one example, the gas filter 280 may be a sponge filter plate.

[0059] Specifically, after the system is powered on and started, the external gas enters the first compression assembly 210 through the gas filter 280, and the dust particles and other impurities in the external gas are filtered out by the gas filter 280 to prevent the impurities carried by the external gas from damaging the internal mechanism of the system. The first compression assembly 210 performs primary compression on the external gas, and the compressed gas flows into the second cooling circulation subsystem 270 through a pipeline. The second cooling circulation subsystem 270 cools the gas after primary compression and transmits the cooled compressed gas to the second compression assembly 240. The second compression assembly 240 performs secondary compression on the cooled compressed gas, and then outputs the secondary compressed gas, thereby realizing high-efficiency and energy-saving compressed gas.

[0060] In one embodiment, Figure 3 As shown, the first cooling cycle subsystem includes a pump 362 , a thermostatic valve 364 , and a heat exchanger 366 .

[0061] The input end of the pump 362 is connected to the first end of the thermostatic valve 364, and the output end is connected to the inlet of the motor cooling mechanism 322; the second end of the thermostatic valve 364 is connected to the output end of the heat exchanger 366; the exhaust port of the motor cooling mechanism 322 is connected to the input end of the heat exchanger 366; the third end of the thermostatic valve 364 is connected between the exhaust port of the motor cooling mechanism 322 and the input end of the heat exchanger 366.

[0062] Wherein, pump 362 may be a water pump. Pump 362 may be used to provide power for the circulation of coolant. Thermostatic valve 364 may be used to control the constant temperature outflow of coolant. Heat exchanger 366 refers to a device used to transfer heat from hot fluid to cold fluid. Heat exchanger 366 may be, but is not limited to, a wall heat exchanger, a hybrid heat exchanger, a heat storage heat exchanger, or a shell-and-tube heat exchanger.

[0063] Specifically, the input end of the pump 362 is connected to the first end of the thermostatic valve 364, and the output end is connected to the inlet of the motor cooling mechanism 322; the second end of the thermostatic valve 364 is connected to the output end of the heat exchanger 366; the discharge port of the motor cooling mechanism 322 is connected to the input end of the heat exchanger 366; the third end of the thermostatic valve 364 is connected between the discharge port of the motor cooling mechanism 322 and the input end of the heat exchanger 366. The coolant flows into the heat exchanger 366, and under the force provided by the pump 362, the coolant flows into the inlet of the motor cooling mechanism 322 through the thermostatic valve 364, and flows back to the heat exchanger 366 from the discharge port of the motor cooling mechanism 322, so as to be discharged through the heat exchanger 366, so as to cool the motor and prevent the motor from being damaged by the internal mechanism of the system due to excessive temperature during the gas compression process.

[0064] In a specific embodiment, Figure 3 As shown, the magnetic levitation centrifugal air compressor two-stage compression system also includes a frequency converter 372 electrically connected to the motor 320, and a frequency converter cooling mechanism 374 for cooling the frequency converter; the frequency converter cooling mechanism 374 is connected between the exhaust port of the motor cooling mechanism 322 and the input end of the heat exchanger 366.

[0065] The inverter 372 can control the motor 320 by changing the frequency of the motor power supply. The inverter cooling mechanism 374 can include a flow channel for transmitting coolant. The coolant is transmitted in the flow channel of the inverter cooling mechanism 374 to carry away the heat of the inverter 372, thereby cooling the inverter 372.

[0066] Specifically, the motor 320 is electrically connected to the frequency converter 372, and the frequency converter 372 can control the operation of the motor 320 by changing the frequency of the motor power supply. The frequency converter cooling mechanism 374 is connected between the discharge port of the motor cooling mechanism 322 and the input end of the heat exchanger 366, and the coolant flows into the heat exchanger 366. Under the force provided by the pump 362, the coolant flows into the inlet of the motor cooling mechanism 322 through the thermostatic valve 364, and is discharged from the discharge port of the motor cooling mechanism 322, and flows back to the heat exchanger 366 after passing through the frequency converter cooling mechanism 374, and is discharged through the heat exchanger 366, so as to achieve cooling of the motor 320 and the frequency converter 372, and prevent the motor or frequency converter from being too hot and damaging the internal mechanism of the system during the gas compression process.

[0067] In one embodiment, Figure 4As shown, a two-stage compression system of a magnetic suspension centrifugal air compressor is provided, which includes a first compression assembly 410, a motor 420, a magnetic suspension bearing assembly 430, a second compression assembly 440, a controller 450, a first cooling circulation subsystem 460 and a second cooling circulation subsystem 470. The second cooling circulation subsystem 470 includes a first cooler 472. The input end of the first cooler 472 is connected to the first exhaust port, and the output end is connected to the second air inlet.

[0068] The first cooler 472 refers to a heat exchange device that can be used to cool the gas compressed by the first compression assembly 410. The first cooler 472 can be, but is not limited to, a tube-in-tube cooler, a plate cooler, and an air-cooled cooler.

[0069] Specifically, the input end of the first cooler 472 is connected to the first exhaust port, and the output end is connected to the second air inlet. When external gas enters the first compression assembly 410, the first compression assembly 410 performs primary compression on the external gas, and the compressed gas flows into the first cooler 472 through a pipeline. The first cooler 472 cools the gas after primary compression, and transmits the cooled compressed gas to the second compression assembly 440. The second compression assembly 440 performs secondary compression on the cooled compressed gas, and then outputs the secondary compressed gas, thereby realizing high-efficiency and energy-saving compressed gas.

[0070] In a specific embodiment, Figure 4 As shown, the magnetic suspension centrifugal air compressor two-stage compression system further includes a third cooling circulation subsystem 480. The input end of the third cooling circulation subsystem 480 is connected to the second exhaust port; the output end of the third cooling circulation subsystem 480 is used to discharge the cooled two-stage compressed gas.

[0071] The third cooling circulation subsystem 480 can be used to cool down the secondary compressed gas output by the second compression assembly 440. The third cooling circulation subsystem 480 can be connected to the second exhaust port of the second compression assembly through a coolant transmission channel.

[0072] Specifically, when external gas enters the first compression assembly 410, the first compression assembly 410 performs primary compression on the external gas, and the compressed gas flows into the second cooling circulation subsystem 470 through a pipeline, and the second cooling circulation subsystem 470 cools the primary compressed gas and transmits the cooled compressed gas to the second compression assembly 440. The second compression assembly 440 performs secondary compression on the cooled compressed gas, and transmits the secondary compressed gas to the third cooling circulation subsystem 480, and the gas is cooled and cooled by the third cooling circulation subsystem 480 before being output, thus further achieving high efficiency and energy saving of the compressed gas.

[0073] In a specific embodiment, Figure 4 As shown, the third cooling cycle subsystem 480 includes a second cooler 482. The input end of the second cooler 482 is connected to the second exhaust port, and the output end is used to discharge the cooled secondary compressed gas.

[0074] The second cooler 482 refers to a heat exchange device that can be used to cool the gas compressed by the second compression assembly. The second cooler 482 can be, but is not limited to, a tube-in-tube cooler, a plate cooler, and an air-cooled cooler.

[0075] Specifically, the input end of the second cooler 482 is connected to the second exhaust port of the second compression assembly 440. When external gas enters the first compression assembly 410, the first compression assembly 410 performs primary compression on the external gas, and the compressed gas flows into the first cooler 472 through the pipeline. The first cooler 472 cools the gas after primary compression, and transmits the cooled compressed gas to the second compression assembly 440. The second compression assembly 440 performs secondary compression on the cooled compressed gas, and outputs the gas after secondary compression after cooling through the second cooler 482, thereby realizing highly efficient and energy-saving compressed gas.

[0076] In one embodiment, Figure 5 As shown, a magnetic suspension centrifugal air compressor two-stage compression system is provided, which includes a first compression assembly 510, a motor 520, a magnetic suspension bearing assembly 530, a second compression assembly 540, a controller 550, a first cooling circulation subsystem 560 and a second cooling circulation subsystem 570; wherein the second cooling circulation subsystem 570 includes a first cooler 572. The input end of the first cooler 572 is connected to the first exhaust port of the first compression assembly 510, and the output end is connected to the second air inlet of the second compression assembly 540; the third cooling circulation subsystem 580 includes a second cooler 582; the input end of the second cooler 582 is connected to the second exhaust port, and the output end is used to discharge the cooled secondary compressed gas. The system also includes a speed regulating valve 590; the speed regulating valve 590 is connected between the second exhaust port of the second compression assembly 540 and the input end of the second cooler 582.

[0077] The speed regulating valve 590 refers to a combination valve formed by connecting a differential pressure reducing valve and a throttle valve in series.

[0078] Since the speed regulating valve 590 is connected between the second exhaust port and the input end of the second cooler 582, after the second compression assembly 540 outputs the secondary compressed gas, the output speed of the secondary compressed gas can be controlled by the speed regulating valve 590, thereby achieving adjustable output speed of the gas after secondary compression.

[0079] In one embodiment, Figure 6As shown, the magnetic bearing assembly 630 includes a first radial magnetic bearing 632 disposed at a first end of the motor main shaft 624 , and a second radial magnetic bearing 634 disposed at a second end of the motor main shaft 624 .

[0080] The first radial magnetic bearing 632 is electrically connected to the controller 650 ; the second radial magnetic bearing 634 is electrically connected to the controller 650 .

[0081] The first radial magnetic bearing 632 is an annular magnetic bearing; the first radial magnetic bearing 632 refers to a magnetic bearing capable of generating radial magnetic force. The second radial magnetic bearing 634 is an annular magnetic bearing; the second radial magnetic bearing 634 refers to a magnetic bearing capable of generating radial magnetic force. The first radial magnetic bearing 632 and the second radial magnetic bearing 634 are respectively sleeved on the motor main shaft 624.

[0082] Specifically, the controller 650 can control the first radial magnetic bearing 632 and the second radial magnetic bearing 634 to work respectively, so that the first radial magnetic bearing 632 and the second radial magnetic bearing 634 generate radial magnetic force, thereby maintaining the motor main shaft 624 suspended.

[0083] In a specific embodiment, the magnetic bearing assembly 630 further includes an axial magnetic bearing 636 disposed on the motor main shaft 624 ; the axial magnetic bearing 636 is electrically connected to the controller 650 .

[0084] The axial magnetic bearing 636 refers to a magnetic bearing capable of generating axial magnetic force.

[0085] Specifically, the axial magnetic bearing 636 is disposed on the motor main shaft 624 , and the controller 650 controls the operation of the axial magnetic bearing 636 , so that the axial magnetic bearing 636 generates an axial magnetic force, thereby maintaining the motor main shaft 624 axially fixed.

[0086] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A two-stage compression system of a magnetically suspended centrifugal air compressor, characterized in that: include: a first compression assembly, the A compression assembly includes a first air inlet, a first air outlet, and a first compression control port; The first air inlet is used to access the outside gas; The motor comprises a motor cooling mechanism, a motor main shaft and a motor stator sleeved on the motor main shaft; the motor The first end of the machine main shaft is mechanically connected to the first compression control port; A magnetic bearing assembly, wherein the magnetic bearing assembly is sleeved on both sides of the motor main shaft; a second compression assembly, the second compression assembly comprising a second intake port, a second exhaust port, and a second compression control port; The said The second compression control port is mechanically connected to the second end of the motor main shaft; the second exhaust port is used to discharge the secondary compressed gas; A controller, the controller being electrically connected to the magnetic bearing assembly; A first cooling circulation subsystem, the first cooling circulation subsystem is cyclically connected with the motor cooling mechanism; a second cooling circulation subsystem, wherein an input end of the second cooling circulation subsystem is connected through the first exhaust port; The output end of the second cooling circulation subsystem is connected to the second air inlet; Wherein, the first cooling circulation subsystem includes a pump, a thermostatic valve and a heat exchanger; the input end of the pump is connected to the The first end of the thermostatic valve and the output end are connected to the inlet of the motor cooling mechanism; the second end of the thermostatic valve is connected to the The outlet of the motor cooling mechanism is connected to the input end of the heat exchanger; The third end of the thermostatic valve is connected between the discharge port of the motor cooling mechanism and the input end of the heat exchanger; The second cooling circulation subsystem includes a first cooler; the input end of the first cooler is connected to the first exhaust The output end is connected to the second air inlet; The magnetic suspension centrifugal air compressor two-stage compression system also includes a frequency converter electrically connected to the motor, and a cooling The inverter cooling mechanism of the inverter; the inverter cooling mechanism is connected to the exhaust port of the motor cooling mechanism through Between the input end of the heat exchanger; The magnetic suspension centrifugal air compressor two-stage compression system also includes a third cooling circulation subsystem; The input end of the system is connected to the second exhaust port; the output end of the third cooling circulation subsystem is used to discharge the cooled Secondary compressed gas; The third cooling circulation subsystem includes a second cooler; the input end of the second cooler is connected to the second exhaust The output port is used to discharge the cooled secondary compressed gas; The magnetic suspension centrifugal air compressor two-stage compression system also includes a speed regulating valve; the speed regulating valve is connected through the second row between the air port and the input end of the second cooler.

2. The magnetic levitation centrifugal air compressor two-stage compression system according to claim 1, characterized in that: It also includes penetration Connect a gas filter to the first gas inlet.

3. The magnetic levitation centrifugal air compressor two-stage compression system according to claim 1, characterized in that: The magnetic levitation The bearing assembly includes a first radial magnetic suspension bearing disposed at a first end of the motor main shaft and a a second radial magnetic bearing at the second end; The first radial magnetic bearing is electrically connected to the controller; the second radial magnetic bearing is electrically connected to the controller device.

4. The magnetic levitation centrifugal air compressor two-stage compression system according to claim 3, characterized in that: The magnetic levitation The bearing assembly also includes an axial magnetic suspension bearing arranged on the main shaft of the motor; The axial magnetic bearing is electrically connected to the controller.

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