Eight kilograms high-speed magnetic suspension and dry oil-free mixed motion centrifugal compressor whole machine structure

Abstract

The utility model discloses a kind of eight kilogram high-speed magnetic suspension and dry type oil-free mixed drive centrifugal compressor complete machine structure, it is related to magnetic suspension air compressor technical field, including magnetic suspension host computer, the air inlet pipe is provided in the first stage impeller inlet of the magnetic suspension host computer, the first stage interstage cooler is connected by pipeline to the first stage impeller outlet of the magnetic suspension host computer, the second stage air inlet pipe is connected to the second stage impeller inlet of the magnetic suspension host computer by the first stage interstage cooler, the second stage interstage cooler is connected by the second stage exhaust pipe to the second stage impeller outlet of the magnetic suspension host computer, the third stage air inlet pipe is connected to the third stage impeller inlet of the dry type oil-free host computer by the second stage interstage cooler, the third stage exhaust pipe is connected to the third stage impeller outlet of the dry type oil-free host computer, the input end of the magnetic suspension host computer is electrically connected with the output end of frequency converter one. The utility model constructs independent efficient closed-loop cooling system, realizes core component accurate temperature control and whole machine high-efficiency energy saving.

Description

Technical Field

[0001] This utility model relates to the field of magnetic levitation air compressor technology, specifically to the overall structure of an eight-kilogram high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor. Background Technology

[0002] Air compressors are widely used power sources in the industrial sector, and their energy consumption accounts for a significant proportion of a factory's total electricity consumption. Against the backdrop of the nation's vigorous promotion of the "dual-carbon" strategy, developing compressor products with higher energy efficiency and better alignment with sustainable development principles has become a crucial and urgent task for the industry. Simultaneously, with the upgrading of industries such as precision manufacturing, food, and pharmaceuticals, the demand for 100% oil-free, highly reliable compressed air is increasingly strong, driving air compressor technology towards cleaner and more intelligent directions.

[0003] In the pursuit of energy-saving and oil-free technologies, magnetic levitation centrifugal compressors are considered a breakthrough technology. By employing magnetic levitation bearings, they eliminate the frictional losses associated with traditional mechanical bearings, fundamentally improving mechanical efficiency and achieving significant energy savings. Simultaneously, because neither the compression chamber nor the bearing system requires lubrication, clean, oil-free air is naturally generated. To cope with the enormous heat generated during the compression process and motor operation, and to ensure stable equipment operation, existing technologies generally equip these compressors with cooling systems. One common approach is to use air cooling or simple open-loop water cooling to dissipate heat from some components. Another approach follows the traditional water cooling path, using external cooling water directly or indirectly to cool the compressed gas and the motor housing.

[0004] However, existing technologies still have shortcomings in use: First, the heat exchange efficiency of air-cooled systems is relatively low, especially in high-temperature environments, making it difficult to ensure that core components always operate within their optimal temperature range, leading to efficiency degradation and increased energy consumption. Second, and more critically, existing water-cooling systems are often poorly designed, failing to manage the cooling medium and cooling path in a refined manner. They typically lack an independent, closed, and efficient circulating cooling loop, making it impossible to provide continuous and stable temperature control for the three core units most sensitive to temperature and generating the most concentrated heat: magnetic levitation bearings, high-speed motors, and frequency converters. This insufficient and uneven cooling becomes a bottleneck restricting further improvement in overall performance: on the one hand, it limits the equipment's ability to operate stably for extended periods under high-temperature or high-load conditions, potentially causing shutdowns due to localized overheating; on the other hand, when components operate at non-optimal temperatures, their electrical control efficiency and magnetic levitation accuracy decrease, resulting in energy waste and preventing the full realization of the inherent energy-saving potential of magnetic levitation technology. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide an overall structure of an 8 kg high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor. By constructing an independent and efficient closed-loop cooling system, it achieves precise temperature control of core components and high energy efficiency of the whole machine, which can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a complete structure of an 8 kg high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor, including a magnetic levitation main unit. The first-stage impeller inlet of the magnetic levitation main unit is provided with an intake duct. The first-stage impeller outlet of the magnetic levitation main unit is connected to a first-stage interstage cooler via a pipe. The first-stage interstage cooler is connected to the second-stage impeller inlet of the magnetic levitation main unit via a second-stage intake pipe. The second-stage impeller outlet of the magnetic levitation main unit is connected to the second-stage interstage cooler via a second-stage exhaust pipe. The second-stage interstage cooler is connected to the third-stage impeller inlet of the dry oil-free compressor via a third-stage intake pipe. The third-stage impeller outlet of the dry oil-free compressor is connected to a third-stage exhaust pipe. The input end of the magnetic levitation main unit is electrically connected to the output end of a frequency converter. The input terminal of the machine is electrically connected to the output terminal of the second frequency converter. The main water inlet pipe is connected to the inlet terminals of the first-stage intercooler, the second-stage intercooler, and the water cooler through the branch water pipes. The outlet terminals of the first-stage intercooler, the second-stage intercooler, and the water cooler are all connected to the main drain pipe through the branch water pipes. The inlet of the centrifugal water pump is connected to the outlet of the water tank. The outlet of the centrifugal water pump is connected to the coolant side inlet of the water cooler. The coolant side outlet of the water cooler is connected to the coolant inlets of the first frequency converter, the second frequency converter, the magnetic levitation main unit, and the dry oil-free main unit through pipelines. The coolant outlets of the first frequency converter, the second frequency converter, the magnetic levitation main unit, and the dry oil-free main unit are connected to the inlet of the water tank through pipelines, forming a coolant circulation loop.Ambient air is first drawn into the first-stage impeller of the magnetic levitation engine through the intake duct. The high-speed rotating first-stage impeller performs work on the air, increasing its pressure and temperature significantly. The high-temperature, high-pressure air discharged from the first-stage impeller is then piped into the first-stage interstage cooler. Here, the high-temperature air exchanges heat with cooling water from the main inlet pipe, resulting in a significant temperature reduction. The cooled air then enters the second-stage impeller of the magnetic levitation engine through the second-stage intake pipe, undergoing a second compression that further increases its pressure and temperature. The high-temperature air generated by the second compression enters the second-stage interstage cooler through the second-stage exhaust pipe, where it again exchanges heat with cooling water to achieve cooling. After two stages of cooling, the air enters the third-stage impeller of the dry-type oil-free engine through the third-stage intake pipe. The air undergoes final compression to reach the target pressure, and the resulting high-pressure air is delivered to the air-consuming equipment through a three-stage exhaust pipe. Throughout the operation, to cool inverter 1, inverter 2, the magnetic levitation main unit, and the dry-type oil-free main unit, a centrifugal water pump pumps out dedicated coolant stored in the water tank. The pumped coolant is first sent to the coolant-side flow channel of the water cooler. Inside the water cooler, the higher-temperature coolant exchanges heat with the lower-temperature cooling water from the main inlet pipe, thus initially cooling the coolant. The cooled coolant then flows out of the water cooler and is divided into multiple streams, flowing into the cooling channels inside inverter 1, inverter 2, the magnetic levitation main unit, and the dry-type oil-free main unit to absorb the large amount of heat generated by these high-power electrical components during operation. The high-temperature coolant, having absorbed heat, flows out from each cooled component and returns to the water tank after collection. Thus, driven by a centrifugal water pump, the coolant continuously circulates within the closed pipeline connecting the water tank, centrifugal water pump, water cooler, and each heat-generating component, continuously carrying away heat. Inverter 1 outputs adjustable frequency power to drive and precisely control the speed of the magnetic levitation main unit. Inverter 2 also outputs adjustable frequency power to independently drive and control the speed of the dry oil-free main unit. This allows both main units to perform stepless speed regulation according to actual gas demand, achieving on-demand gas supply.

[0007] Furthermore, a vent valve is installed on the third-stage exhaust pipe via a branch pipe, and the vent valve is connected to the interior of the third-stage exhaust pipe. When the gas consumption of the gas-using equipment suddenly decreases or the compressor is unloaded, the pressure inside the third-stage exhaust pipe will rise sharply. At this time, the control system issues a command to open the vent valve, and the excess high-pressure air in the third-stage exhaust pipe is quickly released directly to the atmosphere through the vent valve, thereby preventing the system pressure from becoming too high and playing a safety protection role.

[0008] Furthermore, a regulating valve is installed on the third-stage exhaust pipe via a branch pipe, and the regulating valve communicates with the interior of the third-stage exhaust pipe. The regulating valve and the vent valve are installed in parallel on the third-stage exhaust pipe. When the system pressure fluctuates but has not yet reached the level requiring full venting, the control system will precisely adjust the opening of the regulating valve to slightly throttle the vent pipeline, controlling the venting flow of a small portion of the gas. This achieves precise and continuous regulation of the pressure inside the third-stage exhaust pipe, maintaining stable outlet pressure and effectively suppressing surge.

[0009] Furthermore, an air intake filter is installed at the air intake port of the air intake duct. Before entering the air intake duct, ambient air first passes through the air intake filter. The filter material inside the air intake filter physically intercepts and adsorbs impurities such as dust and particulate matter in the air, ensuring that only clean air enters the compressor.

[0010] Furthermore, zero-air-consumption steam traps are installed at the condensate drain outlets of the primary and secondary intercoolers. When compressed air is cooled in the primary and secondary intercoolers, its temperature drops below the dew point, causing the water vapor in the air to condense into liquid water. This condensate accumulates at the bottom of the coolers. The zero-air-consumption steam traps, installed at the condensate drain outlets of the coolers, automatically drain the collected liquid water from the system while preventing uncondensed air from escaping.

[0011] Furthermore, the zero-gas-consumption steam trap is an automatic drain valve, and its drain outlet is connected to the sewage pipe. The automatic drain valve typically employs mechanisms such as a float, diaphragm, or electronic sensor. When condensate accumulates to a certain level, the float inside the valve rises or the diaphragm / sensor is triggered, causing the valve to automatically open and drain. After the water is drained, the float falls or the trigger signal disappears, and the valve automatically closes under the action of a spring or its own weight. The entire process is completely automatic.

[0012] Furthermore, the coolant stored in the water tank is antifreeze, consisting of 50% water and 50% ethylene glycol. In low-temperature environments, when the ambient temperature is below 0°C, pure water will freeze, while the mixture of 50% water and 50% ethylene glycol has a freezing point that can drop to approximately -35°C. This ensures that the centrifugal water pump can still pump liquid normally under extremely cold conditions, preventing the cooling circuit from freezing and blocking it, and protecting components such as the water cooler and magnetic levitation host from damage due to freezing.

[0013] Furthermore, an aftercooler is installed at the exhaust port of the three-stage exhaust pipe. For processes requiring extremely low-temperature compressed air, an aftercooler can be installed on the three-stage exhaust pipe after standard three-stage compression. The final compressed air discharged from the dry oil-free engine, which has undergone three-stage compression but is still at a relatively high temperature, enters the aftercooler before entering the user's pipeline network. There, it undergoes a final intense heat exchange with the internal cooling medium, further reducing its temperature to near ambient temperature.

[0014] Based on the above technical solution, the beneficial effects achieved by the overall structure of the 8kg high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor of this utility model after practical application are as follows: 1. This utility model provides precise temperature control for core heat-generating components by constructing an independent and closed coolant circulation loop, thereby fully releasing the energy-saving potential of magnetic levitation technology. The system is driven by a centrifugal water pump to carry a special coolant in the water tank. After initial cooling by the water cooler, the coolant is then sent to inverter one, inverter two, the magnetic levitation host, and the dry oil-free host for forced heat exchange. This design completely solves the problem of uneven and insufficient cooling in existing technologies, ensuring that the magnetic levitation bearing, high-speed motor, and power electronic devices are always at the optimal operating temperature. It avoids the decline in electrical efficiency and magnetic levitation control accuracy caused by overheating of components, enabling the magnetic levitation host and the dry oil-free host to operate continuously at the highest efficiency, transforming the inherent energy-saving advantages of magnetic levitation technology into real, continuous, and stable low operating energy consumption.

[0015] 2. This utility model utilizes a water cooler, a highly efficient heat exchange device, to achieve isolated heat exchange between the coolant and the external cooling water. This balances efficient heat dissipation with system reliability. The coolant circulates within a closed loop, responsible for absorbing heat from the core components. The external cooling water flows in another loop formed by the main inlet pipe and the main outlet pipe, carrying away the heat from the coolant as it passes through the water cooler. This heat exchange mode not only utilizes the high efficiency of water cooling and ensures strong heat dissipation capacity, but also completely physically isolates the cooling circuit of the core components from the potentially poor-quality external cooling water. This prevents scaling, blockage, and corrosion from damaging the cooling channels of precision components, greatly improving the long-term operational reliability and service life of core components such as the magnetic levitation main unit.

[0016] 3. This utility model significantly expands the environmental adaptability of the whole machine and further ensures its reliability by using antifreeze with a specific composition as the cooling medium in the water tank. The antifreeze is composed of 50% water and 50% ethylene glycol, and its freezing point is much lower than that of pure water. In low-temperature environments, it can effectively prevent the centrifugal water pump, water cooler and internal flow channel of the main unit in the entire coolant circulation loop from being damaged or unable to start due to freezing. This ensures the normal operation and standby safety of the equipment in cold climates and solves the fatal weakness of existing simple water cooling systems in terms of antifreeze. Attached Figure Description

[0017] Figure 1 This is a front-view perspective three-dimensional schematic diagram of the gas passage structure of this utility model.

[0018] Figure 2 This is a rear-view three-dimensional schematic diagram of the air passage structure of this utility model.

[0019] Figure 3 This is a front-view perspective three-dimensional schematic diagram of the water channel structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the control flow of this utility model.

[0021] In the diagram: 1-Intake duct, 2-Magnetic levitation main unit, 3-First-stage interstage cooler, 4-Second-stage intake pipe, 5-Second-stage exhaust pipe, 6-Second-stage interstage cooler, 7-Third-stage intake pipe, 8-Dry oil-free system, 9-Third-stage exhaust pipe, 10-Vent valve, 11-Regulating valve, 12-Main water inlet pipe, 13-Main drain pipe, 14-Centrifugal water pump, 15-Water cooler, 16-Water tank. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4This embodiment provides a technical solution: an 8kg high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor structure, including a magnetic levitation main unit 2. The first-stage impeller inlet of the magnetic levitation main unit 2 is equipped with an intake duct 1. The first-stage impeller outlet of the magnetic levitation main unit 2 is connected to a first-stage interstage cooler 3 via a pipe. The first-stage interstage cooler 3 is connected to the second-stage impeller inlet of the magnetic levitation main unit 2 via a second-stage intake pipe 4. The second-stage impeller outlet of the magnetic levitation main unit 2 is connected to a second-stage interstage cooler 6 via a second-stage exhaust pipe 5. The second-stage interstage cooler 6 is connected to the third-stage impeller inlet of the dry oil-free compressor 8 via a third-stage intake pipe 7. The third-stage impeller outlet of the dry oil-free compressor 8 is connected to a third-stage exhaust pipe 9. The input end of the magnetic levitation main unit 2 is electrically connected to the output end of inverter one, and the input end of the dry oil-free compressor 8 is connected to inverter two. The output end is electrically connected. The main water inlet pipe 12 is connected to the inlet of the first-stage intercooler 3, the second-stage intercooler 6 and the water cooler 15 through the branch water pipe. The outlet of the first-stage intercooler 3, the second-stage intercooler 6 and the water cooler 15 are all connected to the main drain pipe 13 through the branch water pipe. The inlet of the centrifugal water pump 14 is connected to the outlet of the water tank 16. The outlet of the centrifugal water pump 14 is connected to the coolant side inlet of the water cooler 15. The coolant side outlet of the water cooler 15 is connected to the coolant inlet of the frequency converter 1, the frequency converter 2, the magnetic levitation host 2 and the dry oil-free host 8 through the pipeline. The coolant outlet of the frequency converter 1, the frequency converter 2, the magnetic levitation host 2 and the dry oil-free host 8 is connected to the inlet of the water tank 16 through the pipeline, forming a coolant circulation loop.Ambient air is first drawn into the first-stage impeller of the magnetic levitation main unit 2 through the intake duct 1. The high-speed rotating first-stage impeller performs work on the air, increasing its pressure and temperature significantly. The high-temperature, high-pressure air discharged from the first-stage impeller is then introduced into the first-stage interstage cooler 3 through a pipe. Here, the high-temperature air exchanges heat with the cooling water from the main water inlet pipe 12, resulting in a significant temperature reduction. The cooled air is then introduced into the second-stage impeller of the magnetic levitation main unit 2 through the second-stage intake pipe 4 for a second compression, further increasing its pressure and temperature. The high-temperature air generated by the second compression enters the second-stage interstage cooler 6 through the second-stage exhaust pipe 5, where it exchanges heat with the cooling water again to achieve cooling. After two stages of cooling, the air enters the third-stage impeller of the dry-type oil-free main unit 8 through the third-stage intake pipe 7 for further cooling. Finally, the air is compressed to reach the target pressure, and the high-pressure air is delivered to the air-consuming equipment through the three-stage exhaust pipe 9. Throughout the operation, to cool inverter 1, inverter 2, magnetic levitation main unit 2, and dry oil-free main unit 8, centrifugal water pump 14 pumps out dedicated coolant stored in water tank 16. The pumped coolant is first sent to the coolant-side flow channel of water cooler 15. Inside water cooler 15, the higher-temperature coolant exchanges heat with the lower-temperature cooling water from the main inlet pipe 12, thus initially cooling the coolant. The cooled coolant then flows out of water cooler 15 and is divided into multiple streams, flowing into the cooling channels inside inverter 1, inverter 2, magnetic levitation main unit 2, and dry oil-free main unit 8 respectively, absorbing the large amount of heat generated by these high-power electrical components during operation. The high-temperature coolant, having absorbed heat, flows out from each cooled component and returns to the water tank 16 after collection. Thus, driven by the centrifugal water pump 14, the coolant continuously circulates in the closed pipeline of the water tank 16, the centrifugal water pump 14, the water cooler 15, each heat-generating component, and the water tank 16, continuously carrying away heat. Inverter 1 outputs adjustable frequency power to drive and precisely control the speed of the magnetic levitation host 2. Inverter 2 also outputs adjustable frequency power to independently drive and control the speed of the dry oil-free host 8. This allows both hosts to perform stepless speed regulation according to actual gas demand, achieving on-demand gas supply.

[0024] Furthermore, a vent valve 10 is installed on the third-stage exhaust pipe 9 via a branch pipe, and the vent valve 10 is connected to the interior of the third-stage exhaust pipe 9. When the gas consumption of the gas-using equipment suddenly decreases or the compressor is unloaded, the pressure inside the third-stage exhaust pipe 9 will rise sharply. At this time, the control system issues a command to open the vent valve 10, and the excess high-pressure air in the third-stage exhaust pipe 9 is quickly released directly to the atmosphere through the vent valve 10, thereby preventing the system pressure from becoming too high and playing a safety protection role.

[0025] Furthermore, a regulating valve 11 is installed on the third-stage exhaust pipe 9 via a branch pipe, and the regulating valve 11 is connected to the interior of the third-stage exhaust pipe 9. The regulating valve 11 is installed in parallel with the vent valve 10 on the third-stage exhaust pipe 9. When the system pressure fluctuates but has not yet reached the level requiring full venting, the control system will precisely adjust the opening of the regulating valve 11 to slightly throttle the vent pipeline, controlling the venting flow of a small portion of the gas. This achieves fine and continuous regulation of the pressure inside the third-stage exhaust pipe 9, maintains stable outlet pressure, and effectively suppresses surge.

[0026] Furthermore, an air intake filter is installed at the air intake port of the air intake duct 1. Before entering the air intake duct 1, the ambient air first passes through the air intake filter. The filter material inside the air intake filter physically intercepts and adsorbs impurities such as dust and particulate matter in the air, ensuring that only clean air enters the compressor.

[0027] Furthermore, zero-air-consumption steam traps are installed at the condensate drain outlets of the primary intercooler 3 and the secondary intercooler 6. When compressed air is cooled in the primary intercooler 3 and the secondary intercooler 6, its temperature drops below the dew point, causing the water vapor contained in the air to condense into liquid water. This condensate accumulates at the bottom of the cooler. The zero-air-consumption steam traps installed on the condensate drain outlets of the coolers can automatically drain the collected liquid water from the system while preventing uncondensed air from escaping.

[0028] Furthermore, the zero-gas-consumption steam trap is an automatic drain valve, and its drain outlet is connected to the sewage pipe. The automatic drain valve typically employs mechanisms such as a float, diaphragm, or electronic sensor. When condensate accumulates to a certain level, the float inside the valve rises or the diaphragm / sensor is triggered, causing the valve to automatically open and drain. After the water is drained, the float falls or the trigger signal disappears, and the valve automatically closes under the action of a spring or its own weight. The entire process is completely automatic.

[0029] Furthermore, the coolant stored in water tank 16 is antifreeze, consisting of 50% water and 50% ethylene glycol. In low-temperature environments, when the ambient temperature is below 0°C, pure water will freeze, while the mixture of 50% water and 50% ethylene glycol has a freezing point that can drop to approximately -35°C. This ensures that the centrifugal water pump 14 can still pump liquid normally under extremely cold conditions, preventing the cooling circuit from freezing and blocking it, and protecting components such as the water cooler 15 and the magnetic levitation host 2 from damage due to freezing.

[0030] Furthermore, an aftercooler is installed at the exhaust port of the third-stage exhaust pipe 9. For processes requiring extremely low-temperature compressed air, an aftercooler can be installed on the third-stage exhaust pipe 9 after the standard three-stage compression. The final compressed air discharged from the dry oil-free main unit 8, which has undergone three-stage compression but is still at a relatively high temperature, enters the aftercooler before entering the user's pipeline network. There, it undergoes a final intense heat exchange with the internal cooling medium, further reducing its temperature to near ambient temperature.

[0031] The working principle of the eight-kilogram high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor provided by this utility model is as follows: In operation, external air first enters the magnetic levitation host 2 through the intake duct 1 for primary compression. After being cooled by the primary interstage cooler 3, it achieves near-isothermal compression, significantly reducing energy consumption. The cooled gas continues to enter the secondary impeller of the magnetic levitation host 2 for further pressurization, and then enters the dry oil-free host 8 for final compression after being cooled by the secondary interstage cooler 6. This alternating process of multi-stage compression and cooling greatly improves thermodynamic efficiency. At the same time, a dedicated coolant flows out from the water tank 16 driven by the centrifugal water pump 14. It is first cooled by external cooling water in the water cooler 15, and then distributed to inverter one, inverter two, magnetic levitation host 2, and dry oil-free host. The internal components of the system precisely absorb heat and return it to the water tank 16. This closed-loop cycle provides continuous and stable cooling for the core components, avoiding overheating, efficiency degradation, and malfunctions, and ensuring the full utilization of the high-efficiency and energy-saving characteristics of magnetic levitation. The zero-air-consumption drain valves configured in the first-stage intercooler 3 and the second-stage intercooler 6 automatically discharge condensate, ensuring dry intake and oil-free quality for the next stage of compression. Finally, the compressed air is output through the third-stage exhaust pipe 9, and its pressure is intelligently regulated by the vent valve 10 and the regulating valve 11 to effectively prevent surge and ensure stable air supply. Through process integration, the entire system simultaneously achieves extreme energy saving, completely oil-free output, high reliability, and maintenance-free operation.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A complete structure of an 8 kg high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor, comprising a magnetic levitation main unit, wherein the first-stage impeller inlet of the magnetic levitation main unit is provided with an air inlet duct, the first-stage impeller outlet of the magnetic levitation main unit is connected to a first-stage interstage cooler via a pipe, the first-stage interstage cooler is connected to the second-stage impeller inlet of the magnetic levitation main unit via a second-stage air inlet pipe, the second-stage impeller outlet of the magnetic levitation main unit is connected to the second-stage interstage cooler via a second-stage exhaust pipe, the second-stage interstage cooler is connected to the third-stage impeller inlet of the dry oil-free compressor via a third-stage air inlet pipe, the third-stage impeller outlet of the dry oil-free compressor is connected to a third-stage exhaust pipe, the input end of the magnetic levitation main unit is electrically connected to the output end of a frequency converter one, and the input end of the dry oil-free compressor is electrically connected to the output end of a frequency converter two, characterized in that: The main inlet pipe is connected to the inlet of the primary interstage cooler, the secondary interstage cooler, and the water cooler via branch pipes. The outlets of the primary interstage cooler, the secondary interstage cooler, and the water cooler are all connected to the main drain pipe via branch pipes. The inlet of the centrifugal water pump is connected to the outlet of the water tank. The outlet of the centrifugal water pump is connected to the coolant side inlet of the water cooler. The coolant side outlet of the water cooler is connected to the coolant inlets of inverter one, inverter two, the magnetic levitation host, and the dry oil-free host via pipelines. The coolant outlets of inverter one, inverter two, the magnetic levitation host, and the dry oil-free host are connected to the inlet of the water tank via pipelines, forming a coolant circulation loop.

2. The overall structure of the 8 kg high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor according to claim 1, characterized in that: The third-stage exhaust pipe is equipped with a vent valve via a branch pipe, and the vent valve is connected to the interior of the third-stage exhaust pipe.

3. The overall structure of the eight-kilogram high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor according to claim 2, characterized in that: The third-stage exhaust pipe is equipped with a regulating valve via a branch pipe, and the regulating valve is connected to the interior of the third-stage exhaust pipe.

4. The overall structure of the eight-kilogram high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor according to claim 1, characterized in that: An air intake filter is provided at the air intake port of the air intake duct.

5. The overall structure of the 8 kg high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor according to claim 1, characterized in that: Zero-gas-consumption steam traps are installed at the condensate drain outlets of the primary and secondary intercoolers.

6. The overall structure of the eight-kilogram high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor according to claim 5, characterized in that: The zero-air-consumption steam trap is an automatic drain valve, and the drain outlet of the automatic drain valve is connected to the sewage pipe.

7. The overall structure of the 8 kg high-speed magnetic levitation and dry oil-free hybrid centrifugal compressor according to claim 1, characterized in that: An aftercooler is installed at the exhaust port of the three-stage exhaust pipe.

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