High-speed permanent-magnet variable-frequency low-temperature pressurization system

Abstract

The invention relates to the technical field of low-temperature pressurization, in particular to a high-speed permanent magnet frequency conversion low-temperature pressurization system which comprises a magnetic suspension motor and a low-temperature pressurization part, and the low-temperature pressurization part comprises a fan volute, a partition plate, a sealing sleeve, a press wheel assembly and a diffusion assembly. The partition plate is arranged between the suspension magnetic levitation motor and the fan volute, one face of the partition plate is detachably connected with the suspension magnetic levitation motor, and the other face of the partition plate is detachably connected with the fan volute. The sealing sleeve is arranged in the partition plate; the diffusion assembly is arranged in the fan volute and is close to the partition plate. The compressor wheel assembly is arranged in the fan volute and connected with the diffusion assembly. The rotating shaft can penetrate through the diffusion assembly, is inserted into the press wheel assembly and is connected with the press wheel assembly, so that the partition plate, the sealing sleeve, the press wheel assembly and the diffusion assembly form a split type sealing structure, and the split type sealing structure has the advantages of deformation supplementation, flow field control and modular maintenance and is suitable for a low-temperature pressurization scene with the temperature of-190 DEG C or lower; and the overall reliability and adaptability of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature supercharging, and in particular to a high-speed permanent magnet variable-frequency low-temperature supercharging system. Background Art

[0002] In the field of cryogenic engineering, boosting technology is the core link in achieving efficient transportation of cryogenic media, especially in extreme working conditions at and below the liquid nitrogen temperature range. The performance of the boosting system directly determines the energy efficiency and reliability of the entire cryogenic device. The cryogenic booster unit increases the pressure of the cryogenic gas to the process requirement through mechanical work. The technical difficulty lies in how to overcome the challenges of material performance degradation, sudden changes in fluid characteristics, and dynamic seal failure caused by ultra-low temperature environments. Traditional boosting technology often draws on the design concept of normal temperature compressors, but faces severe adaptability bottlenecks in the cryogenic field, among which the performance defects of the sealing system are particularly prominent.

[0003] Currently, mainstream cryogenic booster units generally use labyrinth seals as their core sealing solution. This technology relies on a multi-stage tooth-groove structure to create throttling resistance to suppress fluid leakage. However, in cryogenic environments below -190°C, gas viscosity drops sharply, significantly weakening the labyrinth seal's throttling effect. In actual use, when the temperature drops below -185°C, labyrinth seal leakage increases exponentially. This trace amount of leaked cryogenic fluid can come into contact with the bearing lubrication system, causing the lubricant to solidify and form ice crystals, accelerating wear on the seal teeth. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-speed permanent magnet variable frequency low-temperature supercharging system to address the above-mentioned problems.

[0005] The technical solution adopted by the present invention is as follows: a high-speed permanent magnet variable frequency low-temperature supercharging system, comprising a suspended magnetic levitation motor and a low-temperature supercharging unit. The rotating shaft of the suspended magnetic levitation motor can be inserted into the low-temperature supercharging unit to drive the compressor wheel assembly to rotate, wherein the low-temperature supercharging unit includes a fan volute, a partition, a sealing sleeve, a compressor wheel assembly, and a diffuser assembly;

[0006] The partition is provided between the suspended magnetic levitation motor and the fan volute, and one side of the partition is detachably connected to the suspended magnetic levitation motor, and the other side of the partition is detachably connected to the fan volute;

[0007] The sealing sleeve is arranged in the partition plate and covers the outer circumference of the rotating shaft;

[0008] The pressure diffuser assembly is arranged in the fan volute and close to the partition;

[0009] The compressor wheel assembly is arranged in the fan volute and connected to the diffuser assembly;

[0010] The rotating shaft can pass through the diffuser assembly and be inserted into the press wheel assembly and connected to the press wheel assembly;

[0011] A fan channel is provided in the fan volute, and wind energy generated by the rotation of the compressor wheel assembly driven by the rotating shaft is discharged through the fan channel.

[0012] Furthermore, the press wheel assembly includes a press wheel sealing cover and a press wheel;

[0013] The press wheel sealing cover is provided with a turbine cavity, and the press wheel is arranged in the turbine cavity. The press wheel sealing cover is provided with a mounting mechanism, and is detachably connected to the diffuser assembly through the mounting mechanism.

[0014] A connecting groove is provided in the press wheel, and the rotating shaft can be inserted into the connecting groove and meshed with the key in the connecting groove.

[0015] Furthermore, a guide cone is provided at the end of the press wheel, and the guide cone is connected to the rotating shaft through a limit screw inserted into the connecting groove. The guide cone can guide the wind generated by the rotation of the press wheel assembly.

[0016] Furthermore, the middle part of the turbine cavity bulges inward, the opening on one side of the turbine cavity is small and the cavity bulges gently, and the opening on the other side of the turbine cavity is large and the cavity bulges steeply. The press wheel is located on the side with the small opening of the turbine cavity. The press wheel includes a wheel body and blades, and the shape of the blades is adapted to the shape of the cavity on the side with the small opening of the turbine cavity.

[0017] Furthermore, the pressure diffuser assembly includes a pressure plate and a guide plate, and the pressure plate and the guide plate are connected. A connecting cavity is provided in the pressure diffuser assembly, and the compressor wheel sealing cover and the partition can be inserted into the connecting cavity.

[0018] Furthermore, the press wheel sealing cover is detachably connected to the pressure plate, and the partition is detachably connected to the guide plate.

[0019] Furthermore, a magnetic levitation motor mounting groove is provided on one side of the partition, a protrusion is provided on the other side of the partition, and a sealing sleeve mounting groove is provided in the protrusion. A sealed cavity is provided in the partition, and the rotating shaft can pass through the sealed cavity. The sealing sleeve can be inserted into the partition from the sealing sleeve mounting groove and extend into the sealed cavity to cover the rotating shaft located in the sealed cavity.

[0020] Furthermore, the diameter of the sealing sleeve installation groove is larger than the diameter of the sealing cavity.

[0021] Furthermore, the protrusion can be inserted into the connecting cavity, a through hole is provided on the partition, and the partition, the suspended magnetic levitation motor and the fan volute can be connected by connecting bolts inserted into the through hole.

[0022] Furthermore, a sealing air duct is provided in the partition, and the sealing air duct is communicated with the sealing sleeve installation groove and the sealing cavity respectively.

[0023] The beneficial effects of the present invention include at least one of the following:

[0024] 1. A high-speed permanent magnet variable frequency low-temperature supercharging system comprising a partition, a sealing sleeve, a compressor wheel assembly, and a diffuser assembly is provided. The system comprises a split sealing structure composed of the partition, the sealing sleeve, the compressor wheel assembly, and the diffuser assembly. This system has the advantages of deformation compensation, flow field control, and modular maintenance. It is suitable for low-temperature supercharging scenarios at -190°C or lower, and improves the overall reliability and adaptability of the system.

[0025] 2. The pressure diffuser assembly consists of a pressure plate and a guide plate, which are plugged into the protruding part of the partition to form a multi-level sealing and buffering structure to improve deformation tolerance.

[0026] 3. In the compressor wheel assembly, the turbine cavity adopts a stepped cavity with a gentle small opening side and a steep large opening side. Combined with the streamlined surface of the guide cone, it forms a gradual flow field from low-pressure vortex to high-pressure laminar flow. At the same time, the guide plate is plugged into the compressor wheel sealing cover to construct a multi-stage expansion channel in the connecting cavity, which converts high-speed airflow into laminar flow and reduces turbulent leakage of the working medium.

[0027] 4. The partition is inserted into the connecting cavity of the diffuser assembly through the protrusion and fixed with through-hole bolts to achieve rapid separation of the suspended magnetic levitation motor, the fan volute and the sealing components fixed by the partition. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of a high-speed permanent magnet variable frequency low-temperature boost system;

[0029] Figure 2 This is a schematic diagram of the internal structure of a high-speed permanent magnet variable frequency low-temperature boost system;

[0030] Figure 3 A schematic diagram of a partition structure;

[0031] Figure 4 A schematic structural diagram of a partition from another perspective;

[0032] Figure 5 This is a schematic diagram of the front structure of a partition;

[0033] Figure 6 Schematic diagram of a sealing sleeve structure;

[0034] Figure 7 This is a schematic diagram of the structure of a press wheel sealing cover;

[0035] Figure 8 This is a schematic diagram of a press wheel structure;

[0036] Figure 9 This is a schematic diagram of the front structure of a press wheel;

[0037] Figure 10 This is a schematic diagram of the structure of a pressure diffuser assembly;

[0038] Figure 11 This is a schematic diagram of the internal structure of a diffuser assembly;

[0039] Figure 12 Schematic diagram of a guide cone structure;

[0040] Figure 13 This is a control diagram of a high-speed permanent magnet variable frequency low-temperature boost system.

[0041] In the picture:

[0042] 1 is a limit screw, 2 is a guide cone, 3 is a key, 4 is a first sealing ring, 5 is a compressor wheel sealing cover, 6 is a fan volute, 7 is a first gasket, 8 is a second gasket, 9 is a diffuser assembly, 10 is a compressor wheel, 11 is a second sealing ring, 12 is a partition, 13 is a sealing sleeve, 14 is a limit nut, 15 is a third sealing ring, 16 is a fourth sealing ring, 17 is a suspended magnetic levitation motor, 18 is a stud, 19 is a rotating shaft, 20 is a sealing chamber, 21 is a suspended magnetic levitation motor mounting groove, 22 is a through hole, 23 is a sealing sleeve mounting groove, 24 is an inner groove, 25 is a turbine chamber, 26 is a connecting groove, 27 is a pressure plate, 28 is a guide plate, and 29 is a connecting chamber. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described in the drawings herein can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0045] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0047] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0049] like Figure 1 and 2 As shown, a high-speed permanent magnet variable frequency low-temperature supercharging system includes a suspended magnetic levitation motor 17 and a low-temperature supercharging unit. The rotating shaft 19 in the suspended magnetic levitation motor 17 can be inserted into the low-temperature supercharging unit and drive the compressor wheel assembly to rotate. It is characterized in that the low-temperature supercharging unit includes a fan volute 6, a partition 12, a sealing sleeve 13, a compressor wheel assembly and a diffuser assembly 9;

[0050] The partition 12 is provided between the suspended magnetic levitation motor 17 and the fan volute 6, and one side of the partition 12 is detachably connected to the suspended magnetic levitation motor 17, and the other side of the partition 12 is detachably connected to the fan volute 6;

[0051] The sealing sleeve 13 is arranged in the partition 12 and covers the outer circumference of the rotating shaft 19;

[0052] The pressure diffuser assembly 9 is arranged in the fan volute 6 and is close to the partition 12;

[0053] The compressor wheel assembly is arranged in the fan volute 6 and is connected to the diffuser assembly 9;

[0054] The rotating shaft 19 can pass through the diffuser assembly 9 and be inserted into the press wheel assembly and connected to the press wheel assembly;

[0055] A fan channel is provided in the fan volute 6 , and wind energy generated by the rotation of the press wheel assembly driven by the rotating shaft 19 is discharged through the fan channel.

[0056] The purpose of this design is to provide a high-speed permanent magnet variable frequency low-temperature supercharging system including a partition, a sealing sleeve, a compressor wheel assembly and a diffuser assembly. The partition, the sealing sleeve, the compressor wheel assembly and the diffuser assembly form a split sealing structure, which has the advantages of deformation supplementation, flow field control and modular maintenance. It is suitable for low-temperature supercharging scenarios of -190°C or lower, and improves the overall reliability and adaptability of the system.

[0057] Take nitrogen as an example, the target medium has a flow rate of 1800 Nm 3 / h0℃,101.3kPa, inlet pressure 10 kPa(G), outlet pressure 100 kPa(G), inlet temperature -190℃, outlet temperature -166℃.

[0058] In the specific implementation, Figures 7 to 9 、 Figure 12 As shown, the press wheel assembly includes a press wheel sealing cover 5 and a press wheel 10;

[0059] The press wheel sealing cover 5 is provided with a turbine cavity 25, and the press wheel 10 is provided in the turbine cavity 25. The press wheel sealing cover 5 is provided with a mounting mechanism, and is detachably connected to the diffuser assembly 9 through the mounting mechanism.

[0060] A connecting groove 26 is provided in the press wheel, and the rotating shaft 19 can be inserted into the connecting groove 26 and engage with the key 3 in the connecting groove 26 .

[0061] At the same time, a guide cone 2 is provided at the end of the press wheel 10. The guide cone 2 is connected to the rotating shaft 19 through a limit screw 1 inserted into the connecting groove 26. The guide cone 2 can guide the wind generated by the rotation of the press wheel assembly.

[0062] In addition, the middle part of the turbine cavity 25 bulges inward, the opening on one side of the turbine cavity 25 is small and the cavity bulges gently, and the opening on the other side of the turbine cavity 25 is large and the cavity bulges steeply. The press wheel 10 is located on the side with the small opening of the turbine cavity 25. The press wheel 10 includes a wheel body and blades, and the shape of the blades is adapted to the shape of the cavity on the side with the small opening of the turbine cavity 25.

[0063] The purpose of this design is that in the compressor wheel assembly part, the turbine cavity adopts a stepped cavity with a gentle small opening side and a steep large opening side, combined with the streamlined surface of the guide cone to form a gradual flow field from low-pressure vortex to high-pressure laminar flow. At the same time, the guide plate is plugged into the compressor wheel sealing cover to construct a multi-stage diffusion channel in the connecting cavity, which converts high-speed airflow into laminar flow and reduces turbulent leakage of the working fluid.

[0064] like Figure 10 and Figure 11As shown, the diffuser assembly 9 includes a pressure plate 27 and a guide plate 28, and the pressure plate 27 and the guide plate 28 are connected. A connecting cavity 29 is provided in the diffuser assembly 9, and the compressor wheel sealing cover 5 and the partition 12 can be inserted into the connecting cavity 29.

[0065] At the same time, the press wheel sealing cover 5 is detachably connected to the pressure plate 27 , and the partition plate 12 is detachably connected to the guide plate 28 .

[0066] The purpose of this design is to use a diffuser assembly consisting of a pressure plate and a guide plate, and to connect it with the protruding part of the partition to form a multi-stage sealing and buffering structure to improve the deformation tolerance capability.

[0067] It should be noted that the guide cone 2 of the compressor wheel assembly and the pressure plate 27 of the diffuser assembly form a flow field coupling during use, reducing airflow disturbances. This reduces the radial vibration amplitude of the shaft. Simultaneously, the optimized flow field improves the exhaust efficiency of the fan duct of the fan volute 6 and reduces the total power consumption of the system.

[0068] like Figures 3 to 5 As shown, a suspension magnetic levitation motor mounting groove 21 is provided on one side of the partition 12, a protrusion is provided on the other side of the partition 12, and a sealing sleeve mounting groove 23 is provided in the protrusion. A sealed cavity 20 is provided in the partition 12, and the rotating shaft 19 can pass through the sealed cavity 20. The sealing sleeve 13 can be inserted into the partition 12 from the sealing sleeve mounting groove 23 and extend into the sealed cavity 20 to cover the rotating shaft 19 located in the sealed cavity 20.

[0069] At the same time, the diameter of the sealing sleeve installation groove 23 is larger than the diameter of the sealing cavity 20 .

[0070] Furthermore, the protrusion can be inserted into the connecting cavity 29 , and the partition 12 is provided with a through hole 22 , and the partition 12 , the suspended magnetic levitation motor 17 and the fan volute 6 can be connected by connecting bolts inserted into the through hole 22 .

[0071] At the same time, a sealing air pipeline is also provided in the partition plate 12 , and the sealing air pipeline is communicated with the sealing sleeve installation groove 23 and the sealing cavity 20 respectively.

[0072] The purpose of this design is that the partition is inserted into the connecting cavity of the diffuser assembly through the protrusion and fixed with through-hole bolts, so as to achieve rapid separation of the suspended magnetic levitation motor, the fan volute and the sealing components fixed by the partition.

[0073] like Figure 6 As shown, in this embodiment, a sealing gas pipeline is further provided in the partition 12, and the sealing gas pipeline is communicated with the sealing sleeve installation groove 23 and the sealing cavity 20 respectively.

[0074] The purpose of this design is that the sealing sleeve can be removed separately from the sealing sleeve mounting groove 23 without removing the rotating shaft 19. In addition, since sealing gas can be injected online for secondary sealing, the overall sealing effect is greatly improved.

[0075] It should be pointed out that in order to further improve the sealing effect, a first sealing ring 4 is provided at the connection between the compressor wheel sealing cover and the fan turbine, which is O-shaped, and a second sealing ring 11 is provided at the connection between the diffuser assembly and the partition, which is O-shaped. Since the sealing sleeve is T-shaped, a third sealing ring 15 and a fourth sealing ring 16 are provided at the connection between it and the partition respectively, wherein the third sealing ring is located at the connection between the outside of the sealing sleeve and the partition, and the fourth sealing ring is the connection between the sealing sleeve extending into the partition and the partition. The sealing rings in the two areas are both O-shaped. At the same time, in order to improve the covering effect of the sealing sleeve on the rotating shaft, an inner groove 24 is provided on its inner wall, which can adapt to the rotating shaft 19.

[0076] Since it is necessary to reduce the instability of the connection between the partition and the suspended magnetic levitation motor due to loose bolts during use, the bolts inserted into the through holes 22 usually include a limit nut 14 and a double-headed stud 18, and 12 groups of through holes are set on the front of the partition.

[0077] The entire system must be designed and installed in accordance with the following standards and specifications, including:

[0078] GB150 Steel Pressure Vessels

[0079] GB151 Steel Shell and Tube Heat Exchanger

[0080] GB / T19000 series of "Quality Management Standards"

[0081] JB4730.1~4730.6 Nondestructive Testing of Pressure Equipment

[0082] TSG R004 "Regulations on Safety Technical Supervision of Stationary Pressure Vessels"

[0083] JB / T7672 "Flowchart Graphic Symbols and Text Codes for Air Separation Equipment"

[0084] GB1497 Basic Standard for Low Voltage Electrical Appliances

[0085] GB4720 "Electronic Control Equipment Part 1 Low Voltage Electrical Apparatus and Electronic Control Equipment"

[0086] GB7251 Low Voltage Switchgear Assemblies

[0087] GB / T13384 General Technical Requirements for Packaging of Electromechanical Products

[0088] GB 4208 Degrees of protection provided by enclosures

[0089] HG20592 Steel Pipe Flange (PN Series)

[0090] GB / T5996 "Instructions for use of industrial products" and "Compilation of instructions for use of electromechanical products"

[0091] JB / T 6443-2006 Axial and centrifugal compressors and expansion ends for the petroleum, chemical and gas industries - Compressors

[0092] Inspections of other equipment, materials and engineering construction shall be carried out in accordance with relevant national industry and manufacturer standards.

[0093] like Figure 13 As shown, a high-speed permanent magnet variable frequency low-temperature boost system control method is provided, which includes speed control, boost pressure control, temperature control, and vibration status monitoring.

[0094] The speed control section uses a suspended magnetic levitation motor driven by a frequency converter. The frequency converter receives a speed reference signal from an external control system or a local operator. The motor has a built-in resolver, which feeds actual speed and position information back to the frequency converter in the form of a resolver signal. Based on the deviation between the reference speed and the resolver feedback, the frequency converter precisely controls the motor speed by adjusting the output frequency, achieving closed-loop control of the fan speed.

[0095] In the boost pressure control section, the fan outlet pressure is monitored in real time by a PT401 pressure transmitter. The control system compares the actual outlet pressure measured by the PT401 with the set pressure value, generating a deviation signal. Based on this deviation, a PID control algorithm automatically adjusts the opening of the electric regulating valve TV421 between the fan outlet and the "seal gas inlet." When the outlet pressure exceeds the set value, the TV421 valve is opened wide, allowing some of the boost gas to flow back through the bypass, thereby reducing the effective pressure entering the downstream pipeline network. When the pressure falls below the set value, the TV421 valve is closed, increasing the amount of gas entering the pipeline network. This is a typical closed-loop control circuit for outlet pressure.

[0096] In the temperature control part, it is divided into:

[0097] Motor Cooling Control: Regulating valve V423, the cooling air chamber pressure regulating valve, controls the cooling air pressure entering the motor stator cooling chamber, ensuring effective cooling of key heat-generating components such as the stator windings. This valve can be PID-controlled by a temperature controller based on motor stator temperatures (e.g., "Stator First Temperature PT100" and "Stator Second Temperature PT100"), or it can be manually set.

[0098] Bearing heating control: In low-temperature environments or before startup, a heating medium, such as dry air or a dedicated heating gas, is introduced into the bearing area through the "bearing heating gas inlet." This heating process is typically controlled by an independent temperature controller using PID control based on feedback from the bearing temperature sensor to prevent bearing failure due to low temperatures.

[0099] Temperature Monitoring: The system monitors multiple key temperature points in real time, including but not limited to: "Stator First Temperature PT100", "Stator Second Temperature PT100", "Rear Bearing Temperature PT100", "Front Bearing Temperature PT100", and "Motor Front Chamber Temperature 4-20mA". These temperature signals are used for display and trend analysis, as well as as feedback input for temperature control loops such as motor cooling and bearing heating, or as trigger conditions for protective interlocks.

[0100] Regarding vibration status monitoring, the system uses vibration sensors to monitor the wind turbine shaft's "shaft radial vibration 1" and "shaft radial vibration 2" in real time. The vibration signals are typically converted to standard analog or digital signals by a transmitter before being fed into the control system. The vibration amplitude is used as a key indicator for assessing the equipment's mechanical health, and two thresholds are set: a warning threshold and an interlocking protection threshold. When the vibration value exceeds the warning threshold, an alarm is issued; when it exceeds the protection threshold, a protective interlocking shutdown is triggered.

[0101] At the same time, it also involves comprehensive protection and interlocking control, including the alarm function: when any controlled parameter or monitoring parameter approaches the limit value of its allowable range, the system will issue an audible and visual alarm.

[0102] Protective interlock shutdown: When any of the key operating parameters—stator first temperature PT100, rear bearing temperature PT100, or shaft radial vibration—exceeds its safe operating limit, the interlock system immediately activates, outputting a trip signal to the inverter and shutting the motor down to prevent serious mechanical or electrical failures. Simultaneously, relevant fault information is recorded and an alarm is issued.

[0103] Inverter protection: The inverter itself also has multiple protection functions such as overcurrent, overvoltage, undervoltage, overheating, etc., and will automatically take protective measures under abnormal working conditions.

[0104] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-speed permanent magnet variable frequency low-temperature supercharging system, comprising a suspended magnetic levitation motor (17) and a low-temperature supercharging unit, wherein a rotating shaft (19) in the suspended magnetic levitation motor (17) can be inserted into the low-temperature supercharging unit and drive the compressor wheel assembly to rotate, characterized in that: The low-temperature boosting section comprises a fan volute (6), a partition (12), a sealing sleeve (13), a compressor wheel assembly and a diffuser assembly (9); The partition (12) is provided between the suspended magnetic levitation motor (17) and the fan volute (6), and one side of the partition (12) is detachably connected to the suspended magnetic levitation motor (17), and the other side of the partition (12) is detachably connected to the fan volute (6); The sealing sleeve (13) is arranged in the partition (12) and covers the outer circumference of the rotating shaft (19); The pressure diffuser assembly (9) is disposed in the fan volute (6) and is close to the partition (12); The compressor wheel assembly is arranged in the fan volute (6) and is connected to the diffuser assembly (9); The rotating shaft (19) can pass through the diffuser assembly (9) and be inserted into the press wheel assembly, and be connected to the press wheel assembly; A fan channel is provided in the fan volute (6), and wind energy generated by the rotation of the compressor wheel assembly driven by the rotating shaft (19) is discharged through the fan channel.

2. A high-speed permanent magnet variable frequency low-temperature supercharging system according to claim 1, characterized in that: The press wheel assembly comprises a press wheel sealing cover (5) and a press wheel (10); The press wheel sealing cover (5) is provided with a turbine cavity (25), and the press wheel (10) is provided in the turbine cavity (25). The press wheel sealing cover (5) is provided with a mounting mechanism, and is detachably connected to the diffuser assembly (9) via the mounting mechanism. A connecting groove (26) is provided in the press wheel, and the rotating shaft (19) can be inserted into the connecting groove (26) and meshed with a key (3) in the connecting groove (26).

3. A high-speed permanent magnet variable frequency low-temperature supercharging system according to claim 2, characterized in that: A guide cone (2) is provided at the end of the press wheel (10), and the guide cone (2) is connected to the rotating shaft (19) via a limit screw (1) inserted into the connecting groove (26). The guide cone (2) can guide the wind generated by the rotation of the press wheel assembly.

4. A high-speed permanent magnet variable frequency low-temperature supercharging system according to claim 2, characterized in that: The middle portion of the turbine cavity (25) bulges inward, one side of the turbine cavity (25) has a small opening and the cavity bulges gently, and the other side of the turbine cavity (25) has a large opening and the cavity bulges steeply. The press wheel (10) is located on the side of the turbine cavity (25) with a small opening. The press wheel (10) includes a wheel body and blades, and the shape of the blades is adapted to the shape of the cavity on the side of the turbine cavity (25) with a small opening.

5. The high-speed permanent magnet variable frequency low-temperature supercharging system according to claim 2, characterized in that: The pressure diffuser assembly (9) includes a pressure plate (27) and a guide plate (28), and the pressure plate (27) and the guide plate (28) are connected. A connecting cavity (29) is provided in the pressure diffuser assembly (9), and the press wheel sealing cover (5) and the partition (12) can be inserted into the connecting cavity (29).

6. A high-speed permanent magnet variable frequency low-temperature supercharging system according to claim 5, characterized in that: The press wheel sealing cover (5) is detachably connected to the pressure plate (27), and the partition plate (12) is detachably connected to the guide plate (28).

7. The high-speed permanent magnet variable frequency low-temperature supercharging system according to claim 6, characterized in that: The partition (12) is provided with a suspension magnetic levitation motor mounting groove (21) on one side, and a protrusion is provided on the other side of the partition (12), and a sealing sleeve mounting groove (23) is provided in the protrusion. A sealing cavity (20) is provided in the partition (12), and the rotating shaft (19) can pass through the sealing cavity (20). The sealing sleeve (13) can be inserted into the partition (12) through the sealing sleeve mounting groove (23) and extend into the sealing cavity (20) to cover the rotating shaft (19) located in the sealing cavity (20).

8. The high-speed permanent magnet variable frequency low-temperature supercharging system according to claim 7, characterized in that: The diameter of the sealing sleeve installation groove (23) is larger than the diameter of the sealing cavity (20).

9. The high-speed permanent magnet variable frequency low-temperature supercharging system according to claim 7, characterized in that: The protrusion can be inserted into the connecting cavity (29), a through hole (22) is provided on the partition (12), and the partition (12), the suspended magnetic levitation motor (17) and the fan volute (6) can be connected by connecting bolts inserted into the through hole (22).

10. A high-speed permanent magnet variable frequency low-temperature supercharging system feeding method according to claim 7, characterized in that: A sealing air duct is also provided in the partition (12), and the sealing air duct is communicated with the sealing sleeve installation groove (23) and the sealing cavity (20) respectively.

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