Gas supply system for a floating bearing, control method and compressor

Abstract

The application relates to the refrigeration technical field, and in particular to a gas supply system for a suspension bearing, a control method and a compressor. The refrigeration main cycle of the gas supply system comprises an evaporator, a compressor, a check valve, a condenser and a first throttling valve connected in sequence, the compressor comprises a suspension bearing and a motor; a cooling branch is used for cooling the motor; a first heat exchanger is connected with the evaporator to reduce the temperature of the refrigerant in the cooling branch; a gas supply branch is located between the first heat exchanger and a second throttling valve, the gas supply branch comprises a third throttling valve and a liquid storage tank connected in sequence, the liquid storage tank is used for storing liquid refrigerant, and the liquid storage tank is used for supplying the suspension bearing with the liquid refrigerant heated in the liquid storage tank. Through the cooperation of the refrigeration main cycle, the cooling branch, the gas supply branch and a temperature detection assembly, the low-temperature refrigerant of the evaporator is used to cool the high-temperature refrigerant of the condenser, the effectiveness of the motor cooling is ensured, and the liquid refrigerant with a suitable temperature is provided for the liquid storage tank to heat and evaporate the gas supply.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to an air supply system, control method and compressor for a suspension bearing. Background Technology

[0002] Due to its advantages such as high efficiency, energy saving, and oil-free operation, static pressure air suspension bearing technology has been widely used in refrigeration compressor units, playing a vital role in ensuring the unit's cooling effect and stable operation. Existing bearing air supply schemes for static pressure air suspension units typically use an electric heater to continuously heat the liquid refrigerant in the storage tank, causing it to evaporate and generate gas, which is then used to supply air to the air suspension bearings. Some technical solutions add a small refrigeration cycle system to the air supply system, utilizing the heat released by the condenser of this system to heat the refrigerant in the storage tank, thereby reducing the energy consumption of the electric heater.

[0003] Existing technical solutions have limited application of static pressure air suspension bearings in high-temperature heat pump units and steam compressor units, and have failed to fully consider the temperature characteristics of the refrigerant in the system under high-temperature conditions and its impact on the stability of gas supply. Summary of the Invention

[0004] One embodiment of this application provides an air supply system, control method, and compressor for a suspension bearing, in order to address the shortcomings of existing technologies that have limited coverage of the application of static pressure air suspension bearings in high-temperature heat pump units and steam compressor units, and which fail to fully consider the temperature characteristics of the refrigerant in the system under high-temperature conditions and its impact on the stability of the air supply.

[0005] In a first aspect, one embodiment of this application provides an air supply system for a suspension bearing, comprising: The refrigeration main cycle includes an evaporator, a compressor, a check valve, a condenser, and a first throttle valve connected in sequence. The compressor includes a suspension bearing, a motor, and a frequency converter. The cooling branch includes a first heat exchanger connected to the condenser and a second throttle valve connected to the compressor. The first heat exchanger is connected to the second throttle valve. The cooling branch is used to cool the motor and the frequency converter. The first heat exchanger is connected to the evaporator. The low-temperature refrigerant in the evaporator can exchange heat with the high-temperature refrigerant in the condenser to reduce the temperature of the refrigerant in the cooling branch. A gas supply branch is located between the first heat exchanger and the second throttle valve. The gas supply branch includes a third throttle valve and a liquid storage tank connected in sequence. The liquid storage tank is used to store liquid refrigerant and to heat the liquid refrigerant inside the tank before supplying it to the suspension bearing. A temperature detection component is used to detect the temperature of the liquid storage tank and / or the cooling branch.

[0006] Optionally, the first heat exchanger has a first heat exchange channel and a second heat exchange channel. The first heat exchange channel is used to connect with the condenser to introduce a high-temperature refrigerant, and the second heat exchange channel is used to connect with the evaporator to introduce a low-temperature refrigerant. The first heat exchange channel and the second heat exchange channel exchange heat to reduce the temperature of the high-temperature refrigerant.

[0007] Optionally, a heating branch is provided between the condenser and the evaporator, and a second heat exchanger is provided on the heating branch. The second heat exchanger is located in the liquid storage tank, and the refrigerant in the heating branch flows from the condenser, through the second heat exchanger, and back to the evaporator.

[0008] Optionally, a first valve body is provided between the condenser and the liquid storage tank, and a second valve body is provided between the gas outlet of the liquid storage tank and the suspension bearing.

[0009] Optionally, the storage tank is equipped with a heater.

[0010] Optionally, the temperature detection assembly includes a first temperature detection element and a second temperature detection element, wherein the first temperature detection element is disposed in the liquid storage tank, and the second temperature detection element is disposed between the second throttle valve and the first heat exchanger.

[0011] Optionally, a third valve body is provided between the condenser and the first heat exchanger, and a fourth valve body is provided between the evaporator and the first heat exchanger.

[0012] Secondly, one embodiment of this application provides a control method for a gas supply system for a suspension bearing based on the first aspect of this application. The gas supply system for the suspension bearing includes a heating branch disposed between the condenser and the evaporator, a second heat exchanger disposed on the heating branch, a heater disposed in the liquid storage tank, and the first heat exchanger having a first heat exchange channel and a second heat exchange channel. The control method includes: Control the start of the main cooling cycle; The gas supply branch and the cooling branch are opened, and the heater is turned on so that the liquid refrigerant in the storage tank is heated into a gaseous state and then supplied to the suspension bearing; When the temperature of the cooling branch is detected to reach the first threshold, the flow rate of the low-temperature refrigerant flowing through the second heat exchange channel is increased, and the heating branch is opened, so that the high-temperature refrigerant drawn from the condenser enters the second heat exchanger to heat the liquid refrigerant in the storage tank. When the temperature of the liquid storage tank is detected to reach the second threshold, the refrigerant flow in the gas supply branch is maintained and the heater is turned off; when the temperature of the liquid storage tank is detected to be lower than the third threshold, the auxiliary heating of the heater is turned on. The main cooling cycle is shut down, while the heating branch is kept open and the heater is started to heat the liquid refrigerant in the storage tank. The refrigerant is then supplied to the suspension bearing through the gas supply branch until the rotor of the suspension bearing stops rotating.

[0013] Optionally, when the temperature of the storage tank is detected to be lower than the second threshold, the flow rate of the heating branch is increased.

[0014] Optionally, the control method further includes: after the unit stops due to a fault or power failure, controlling the heater to turn on, so that the heater heats the liquid refrigerant in the storage tank and supplies it to the suspension bearing until the rotor of the suspension bearing stops rotating.

[0015] Thirdly, one embodiment of this application provides a compressor, including a suspension bearing, a motor, a frequency converter, and an air supply system for the suspension bearing provided in the first aspect of this application.

[0016] The technical solution provided in this application, compared with the prior art, has the following advantages: An embodiment of this application provides a gas supply system for a suspension bearing. By setting up a main refrigeration cycle, a complete refrigerant circulation basis is provided for the gas supply system of the suspension bearing, ensuring the overall stability of the system operation. By setting up a cooling branch and connecting the first heat exchanger to the evaporator, the low-temperature refrigerant in the evaporator exchanges heat with the high-temperature refrigerant drawn from the condenser, reducing the temperature of the refrigerant in the cooling branch. This allows the cooling branch to cool the compressor motor and inverter with a lower-temperature refrigerant, preventing insufficient cooling of the motor and inverter due to excessively high refrigerant temperature under high-temperature operating conditions. By setting up a gas supply branch and arranging it between the first heat exchanger and the second throttling valve, the refrigerant cooled by the first heat exchanger can enter the liquid storage tank after being throttled and depressurized by the third throttling valve. The liquid storage tank heats and evaporates the liquid refrigerant and directly supplies gas to the suspension bearing. This achieves an integrated design of the gas supply branch and the cooling branch, simplifying the system structure. By setting up temperature detection components to monitor the temperature of the liquid storage tank and / or cooling circuits, the evaporation status of the refrigerant in the liquid storage tank and the cooling effect of the cooling circuits on the motor and frequency converter can be monitored in real time, providing accurate temperature feedback for system regulation. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1 A schematic diagram of an air supply system for a suspension bearing provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the liquid storage tank provided in the embodiments of this application; Figure 3 A flowchart illustrating the steps of a control method based on an air supply system for a suspension bearing, provided in an embodiment of this application. Figure 4 A flowchart of step S300 of the control method provided in the embodiments of this application; Figure 5 A flowchart of step S400 of the control method provided in the embodiments of this application.

[0021] Explanation of reference numerals in the attached figures: 1. Refrigeration main cycle; 11. Evaporator; 12. Compressor; 13. Check valve; 14. Condenser; 15. First throttle valve; 2. Cooling branch; 21. First heat exchanger; 22. Second throttle valve; 23. Third valve body; 24. Fourth valve body; 211. First heat exchange channel; 212. Second heat exchange channel; 3. Gas supply branch; 31. Third throttle valve; 32. Liquid storage tank; 33. Second valve body; 34. Heater; 4. Temperature detection assembly; 41. First temperature detection element; 42. Second temperature detection element; 5. Heating branch; 51. Second heat exchanger; 52. First valve body. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0024] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0025] To address the shortcomings of existing technologies in the application of static pressure air suspension bearings in high-temperature heat pump units and steam compressor units, which fail to fully consider the temperature characteristics of the refrigerant within the system under high-temperature conditions and its impact on the stability of the gas supply, this application provides an embodiment of a gas supply system for suspension bearings. Through the coordinated operation of the main refrigeration cycle, cooling branch, gas supply branch, and temperature detection components, the system utilizes the low-temperature refrigerant in the evaporator to cool the high-temperature refrigerant in the condenser. This ensures the effectiveness of cooling the motor and frequency converter while providing the liquid storage tank with a suitable temperature for heating and evaporation of the gas supply.

[0026] Figure 1 and Figure 2An embodiment of this application provides an air supply system for a suspension bearing, comprising a main refrigeration cycle 1, a cooling branch 2, an air supply branch 3, and a temperature detection component 4. The main refrigeration cycle 1 includes an evaporator 11, a compressor 12, a check valve 13, a condenser 14, and a first throttle valve 15 connected in sequence. The compressor 12 includes a suspension bearing, a motor, and a frequency converter. The cooling branch 2 includes a first heat exchanger 21 connected to the condenser 14 and a second throttle valve 22 connected to the compressor 12. The first heat exchanger 21 is connected to the second throttle valve 22. The cooling branch 2 is used for cooling... The motor and frequency converter are excluded; the first heat exchanger 21 is connected to the evaporator 11, and the low-temperature refrigerant of the evaporator 11 can exchange heat with the high-temperature refrigerant of the condenser 14 to reduce the temperature of the refrigerant in the cooling branch 2; the gas supply branch 3 is located between the first heat exchanger 21 and the second throttle valve 22, and the gas supply branch 3 includes a third throttle valve 31 and a liquid storage tank 32 connected in sequence. The liquid storage tank 32 is used to store liquid refrigerant and to supply the suspended bearing after heating the liquid refrigerant inside it; the temperature detection component 4 is used to detect the temperature of the liquid storage tank 32 and / or the cooling branch 2.

[0027] In this embodiment, the main refrigeration cycle 1 includes an evaporator 11, a compressor 12, a check valve 13, a condenser 14, and a first throttle valve 15 connected in sequence. The compressor 12 further includes a suspension bearing, a motor, and a frequency converter, thus forming a complete refrigerant circulation loop. The cooling branch 2 includes a first heat exchanger 21 connected to the condenser 14 and a second throttle valve 22 connected to the compressor 12. The first heat exchanger 21 is connected to the second throttle valve 22 and is also connected to the evaporator 11, allowing the low-temperature refrigerant in the evaporator 11 to exchange heat with the high-temperature refrigerant drawn from the condenser 14 in the first heat exchanger 21, thereby reducing the temperature of the refrigerant in the cooling branch 2. This cooling branch 2 is used to cool the motor and frequency converter of the compressor 12. The gas supply branch 3 is located between the first heat exchanger 21 and the second throttle valve 22 and includes a third throttle valve 31 and a liquid receiver 32 connected in sequence. The liquid receiver 32 is used to store liquid refrigerant and heats the liquid refrigerant inside it before supplying it to the suspension bearing of the compressor 12. Temperature detection component 4 is used to detect the temperature of liquid storage tank 32 and / or cooling branch 2 to monitor the gas supply temperature and cooling temperature.

[0028] The first heat exchanger 21 can be a shell-and-tube heat exchanger, with its tube side connected to the cooling branch 2 to carry the high-temperature liquid refrigerant drawn from the condenser 14, and its shell side connected to the evaporator 11 to introduce low-temperature refrigerant, achieving heat exchange between the refrigerants on both sides through the tube wall; the second throttle valve 22 and the third throttle valve 31 can both be electronic expansion valves to accurately adjust the refrigerant flow rate according to the system load; the temperature detection component 4 can include at least one temperature sensor, which can be installed inside the liquid storage tank 32 to detect the refrigerant temperature inside the liquid storage tank 32, and / or installed on the pipeline of the cooling branch 2 to detect the refrigerant temperature inside the cooling branch 2. Through the above structural design, the condenser 14 in the main refrigeration cycle 1 draws out high-temperature liquid refrigerant into the cooling branch 2. It first exchanges heat with the low-temperature refrigerant drawn out by the evaporator 11 through the first heat exchanger 21 to cool down, and then enters the compressor 12 after being throttled by the second throttling valve 22 to cool the motor and frequency converter. At the same time, part of the refrigerant is drawn out from the pipeline between the first heat exchanger 21 and the second throttling valve 22, and enters the liquid storage tank 32 after being throttled and depressurized by the third throttling valve 31. The liquid storage tank 32 heats and evaporates the liquid refrigerant inside and supplies it to the suspension bearing to realize the bearing gas supply. The temperature detection component 4 detects the temperature of the liquid storage tank 32 and / or the cooling branch 2 in real time to provide data basis for system operation control.

[0029] This embodiment provides a complete refrigerant circulation foundation for the suspension bearing gas supply system by setting up the main refrigeration cycle 1, ensuring the overall stability of the system operation. By setting up a cooling branch 2 and connecting the first heat exchanger 21 to the evaporator 11, the low-temperature refrigerant in the evaporator 11 exchanges heat with the high-temperature refrigerant drawn from the condenser 14, reducing the temperature of the refrigerant in the cooling branch 2. This allows the cooling branch 2 to cool the motor and inverter of the compressor 12 with a lower-temperature refrigerant, preventing insufficient cooling of the motor and inverter due to excessively high refrigerant temperature under high-temperature operating conditions. By setting up a gas supply branch 3 and arranging it between the first heat exchanger 21 and the second throttle valve 22, the refrigerant cooled by the first heat exchanger 21 can be throttled and depressurized by the third throttle valve 31 before entering the liquid storage tank 32. The liquid storage tank 32 heats and evaporates the liquid refrigerant and directly supplies gas to the suspension bearing, realizing the integrated design of the gas supply branch 3 and the cooling branch 2, simplifying the system structure. By setting up temperature detection component 4 to detect the temperature of liquid storage tank 32 and / or cooling branch 2, the evaporation state of the refrigerant in liquid storage tank 32 and the cooling effect of cooling branch 2 on the motor and frequency converter can be monitored in real time, providing accurate temperature feedback for system adjustment. This gas supply system, through the coordinated operation of the main refrigeration cycle 1, cooling branch 2, gas supply branch 3, and temperature detection component 4, utilizes the low-temperature refrigerant in evaporator 11 to cool the high-temperature refrigerant in condenser 14. This ensures effective cooling of the motor and frequency converter, provides liquid refrigerant at a suitable temperature for heating and evaporation in liquid storage tank 32, and enables real-time monitoring of the operating status through temperature detection, thus improving the overall system integration and operational reliability.

[0030] Please see Figure 1 In one embodiment, the first heat exchanger 21 has a first heat exchange channel 211 and a second heat exchange channel 212, which are disposed within the same heat exchanger shell and isolated from each other, and achieve heat conduction through a shared heat exchange wall surface. Specifically, the first heat exchange channel 211 and the second heat exchange channel 212 can be respectively formed as a tube-side channel and a shell-side channel, with the first heat exchange channel 211 being the tube side and the second heat exchange channel 212 being the shell side; the first heat exchange channel 211 and the second heat exchange channel 212 can also be adjacent and isolated inter-plate channels in a plate heat exchanger; the first heat exchange channel 211 and the second heat exchange channel 212 can also be the inner tube channel and the annular channel in a shell-and-tube heat exchanger. The first heat exchange channel 211 is used to connect to the condenser 14, and its inlet end is connected to the outlet of the condenser 14 to introduce the high-temperature refrigerant discharged from the condenser 14. The second heat exchange channel 212 is used to connect to the evaporator 11, and its inlet end is connected to the outlet of the evaporator 11 to introduce the low-temperature refrigerant discharged from the evaporator 11. The first heat exchange channel 211 and the second heat exchange channel 212 exchange heat non-contactly through the heat exchange wall between them. The heat of the high-temperature refrigerant is transferred to the low-temperature refrigerant through the heat exchange wall, thereby reducing the temperature of the high-temperature refrigerant. The high-temperature refrigerant discharged from the condenser 14 enters the first heat exchange channel 211, and the low-temperature refrigerant discharged from the evaporator 11 enters the second heat exchange channel 212. The two exchange heat through the isolation wall in the first heat exchanger 21, and the high-temperature refrigerant releases heat to the low-temperature refrigerant, thereby reducing the temperature of the high-temperature refrigerant.

[0031] By integrating the first heat exchange channel 211 and the second heat exchange channel 212 into the same first heat exchanger 21, high-temperature and low-temperature refrigerants can exchange heat within the same device, eliminating the need for separate cooling cycles or heat exchange equipment and reducing the number of system components. By connecting the first heat exchange channel 211 to the condenser 14 to introduce the high-temperature refrigerant and the second heat exchange channel 212 to the evaporator 11 to introduce the low-temperature refrigerant, the existing high-temperature refrigerant in the condenser 14 and the low-temperature refrigerant in the evaporator 11 within the main refrigeration cycle 1 are directly utilized, eliminating the need for external cooling media and achieving heat recovery within the system. The heat exchange between the first and second heat exchange channels 211 and 212 lowers the temperature of the high-temperature refrigerant, reducing it to a level that meets the requirements of subsequent piping and preventing insufficient cooling or unstable operation caused by the high-temperature refrigerant directly entering subsequent components. The first heat exchanger 21, through its dual-channel structure and connection with the condenser 14 and the evaporator 11, enables the system to directly utilize the low-temperature refrigerant discharged from the evaporator 11 to cool the high-temperature refrigerant discharged from the condenser 14. This achieves the cascade utilization of the refrigerant heat within the system, reducing the temperature of the high-temperature refrigerant while improving the system's energy utilization efficiency. Furthermore, it eliminates the need for additional external cooling equipment, simplifying the system structure and reducing costs.

[0032] Please see Figure 1 and Figure 2 In this embodiment, a heating branch 5 is provided between the condenser 14 and the evaporator 11. This heating branch 5 forms a separate connecting pipe between the outlet of the condenser 14 and the inlet of the evaporator 11, used to introduce the high-temperature refrigerant discharged from the condenser 14 into the liquid storage tank 32 to provide a heat source for heat exchange. A second heat exchanger 51 is provided on the heating branch 5. The second heat exchanger 51 is a heat exchange coil structure, and its heat exchange surface is immersed in the liquid refrigerant in the liquid storage tank 32 or attached to the inner wall of the liquid storage tank 32 to achieve efficient heat transfer to the liquid refrigerant in the liquid storage tank 32. The second heat exchanger 51 is located inside the liquid storage tank 32, and its entirety or the main heat exchange part is located in the internal space of the liquid storage tank 32, in direct contact with or close to the liquid refrigerant in the liquid storage tank 32. The refrigerant in heating branch 5 flows through the following path: after being drawn from condenser 14, the refrigerant enters heating branch 5, flows through second heat exchanger 51, and exchanges heat with the liquid refrigerant in storage tank 32 in second heat exchanger 51 to release heat. Then it flows out of second heat exchanger 51 and returns to evaporator 11, completing the cycle of heating branch 5.

[0033] A solenoid valve can be installed at the outlet of the condenser 14 to control the on / off state of the heating branch 5. The second heat exchanger 51 can adopt a coil structure, with the coils spirally arranged along the inner wall of the liquid storage tank 32 or arranged in multiple layers along the height direction of the liquid storage tank 32 to increase the heat exchange area. The connection point of the heating branch 5 returning to the evaporator 11 can be located on the low-pressure side of the inlet pipe of the evaporator 11, so that the refrigerant after heat release can merge with the low-temperature and low-pressure refrigerant in the evaporator 11. Part of the high-temperature refrigerant discharged from the condenser 14 enters the second heat exchanger 51 in the liquid storage tank 32 through the heating branch 5. The second heat exchanger 51 transfers the heat of the high-temperature refrigerant to the liquid refrigerant in the liquid storage tank 32. The refrigerant after heat release flows out from the second heat exchanger 51 and returns to the evaporator 11, thereby realizing the function of using the unit's own high-temperature heat source to heat the liquid storage tank 32.

[0034] This embodiment provides a heating branch 5 between the condenser 14 and the evaporator 11, offering a heat source path independent of the electric heater 34 for heating the liquid storage tank 32. This allows the system to utilize the high-temperature refrigerant discharged from the condenser 14 in the main refrigeration cycle 1 as a heat source. By installing a second heat exchanger 51 on the heating branch 5 and placing it inside the liquid storage tank 32, the heat from the high-temperature refrigerant can be directly and efficiently transferred to the liquid refrigerant in the tank 32, achieving heating and evaporation of the refrigerant and providing a stable gas source for the suspension bearing. The refrigerant in the heating branch 5 flows through the condenser 14 and the second heat exchanger 51 before returning to the evaporator 11. After releasing heat in the second heat exchanger 51, the high-temperature refrigerant returns to the evaporator 11 side of the main refrigeration cycle 1, achieving refrigerant recycling and avoiding refrigerant waste. The installation of the heating branch 5 and the second heat exchanger 51 enables the system to directly use the high-temperature refrigerant discharged from the condenser 14 as a heat source to heat the liquid refrigerant in the storage tank 32 without the need for additional independent heating equipment or refrigeration cycle system. While reducing the usage time of the electric heater 34 and reducing system energy consumption, it also realizes the recovery and utilization of the unit's own heat, improves the overall energy efficiency of the system, and ensures the stability of the air supply to the suspension bearing.

[0035] Please see Figure 1 and Figure 2 In one embodiment, a first valve body 52 is provided on the pipeline between the condenser 14 and the liquid storage tank 32. This first valve body 52 controls the on / off state or flow rate of refrigerant supplied from the condenser 14 to the liquid storage tank 32. The first valve body 52 can be a solenoid valve, which opens or closes the pipeline by receiving a control signal; alternatively, it can be a ball valve, which controls the on / off state or flow rate regulation by rotating the valve core. A second valve body 33 is provided on the pipeline between the outlet of the liquid storage tank 32 and the suspension bearing. This second valve body 33 controls the on / off state or flow rate of gas supplied from the liquid storage tank 32 to the suspension bearing. The second valve body 33 can be a solenoid valve, which opens or closes the gas supply path electrically; alternatively, it can be a ball valve, which controls the on / off state or flow rate regulation by rotating the valve core. The refrigerant discharged from the condenser 14 enters the liquid storage tank 32 after being controlled by the first valve body 52. ​​The gas generated by heating and evaporation in the liquid storage tank 32 is supplied to the suspension bearing after being controlled by the second valve body 33. The first valve body 52 and the second valve body 33 independently control the liquid inlet passage and the gas outlet passage of the liquid storage tank 32, respectively.

[0036] By installing a first valve body 52 between the condenser 14 and the liquid storage tank 32, the timing and flow rate of refrigerant delivery from the condenser 14 to the liquid storage tank 32 can be controlled, enabling on-demand on / off or adjustment of the liquid inlet to the liquid storage tank 32 and preventing overcharging or insufficient refrigerant supply. By installing a second valve body 33 between the gas outlet of the liquid storage tank 32 and the suspension bearing, the timing and flow rate of gas supply from the liquid storage tank 32 to the suspension bearing can be controlled, ensuring a stable gas source for the suspension bearing when needed and preventing gas backflow into the liquid storage tank 32. The first valve body 52 and the second valve body 33 are respectively installed on the liquid inlet side and the gas outlet side of the liquid storage tank 32, realizing independent control of the liquid inlet and gas outlet paths of the liquid storage tank 32. This allows the system to adjust the liquid level replenishment of the liquid storage tank 32 and the bearing gas supply according to the operating status, improving the control accuracy and operational reliability of the gas supply system.

[0037] Please see Figure 2 In this embodiment, the liquid storage tank 32 is a tank structure with an internal sealed cavity for containing and storing liquid refrigerant. A heater 34 is provided within the internal space of the liquid storage tank 32. This heater 34 is a heating device capable of converting electrical energy into heat energy. The heater 34 can be an electric heating rod, the main body of which extends along the height of the liquid storage tank 32 and is immersed in the liquid refrigerant; the heater 34 can also be an electric heating coil, coiled along the inner wall of the liquid storage tank 32; the heater 34 can be fixed to the inner bottom surface or inner side wall of the liquid storage tank 32 by a bracket or fasteners. The liquid storage tank 32 provides an internal space to contain the liquid refrigerant. The heater 34 is disposed within this internal space and is in direct contact with the liquid refrigerant. The heat generated by the heater 34 during operation is directly transferred to the liquid refrigerant within the liquid storage tank 32, causing it to evaporate and produce gas.

[0038] By incorporating a liquid storage tank 32, a sealed container is provided for the storage and heating / evaporation of the liquid refrigerant. A heater 34 is placed within the liquid storage tank 32, placing it within the same cavity as the liquid refrigerant. The heat generated by the heater 34 can be directly transferred to the liquid refrigerant, reducing heat loss during transfer. The heater 34 within the liquid storage tank 32 allows the system to directly heat and evaporate the liquid refrigerant within the tank, providing a stable gas source for the suspension bearing. Furthermore, the compact layout of the internal structure within the liquid storage tank 32 reduces external heat transfer losses, improves heating efficiency, and ensures the reliability of the bearing's gas supply.

[0039] Please see Figure 1In one embodiment, the temperature detection component 4 includes a first temperature detection element 41 and a second temperature detection element 42, which together constitute a monitoring structure for the temperature of key parts of the system. Both the first temperature detection element 41 and the second temperature detection element 42 can be temperature sensors, such as thermocouples or resistance temperature detectors (RTDs). The first temperature detection element 41 is disposed in the liquid storage tank 32 to detect the temperature state inside the liquid storage tank 32; the first temperature detection element 41 can be disposed on the side wall of the liquid storage tank 32 to detect the refrigerant temperature inside the tank, or disposed at the outlet of the liquid storage tank 32 to detect the outlet gas temperature. The second temperature detection element 42 is disposed between the second throttle valve 22 and the first heat exchanger 21 to detect the refrigerant temperature in this section of the pipeline; the second temperature detection element 42 can be disposed on the outer wall of the pipeline between the second throttle valve 22 and the first heat exchanger 21 to detect the pipe wall temperature, or disposed in the internal flow channel of this section of the pipeline to directly detect the refrigerant temperature. The first temperature detection element 41 detects the temperature of the liquid storage tank 32 in real time, and the second temperature detection element 42 detects the refrigerant temperature of the pipeline between the second throttle valve 22 and the first heat exchanger 21 in real time. The two work together to obtain the temperature information of the key nodes of the liquid storage tank 32 and the cooling branch 2.

[0040] By setting up temperature detection component 4, the system's operating temperature is monitored. Temperature detection component 4 includes a first temperature sensor 41 and a second temperature sensor 42, enabling the system to simultaneously detect the temperature of key nodes in the liquid storage tank 32 and the cooling branch 2. By placing the first temperature sensor 41 in the liquid storage tank 32, the temperature data of the refrigerant inside the tank can be obtained in real time, thereby determining the heating and evaporation state of the liquid refrigerant and whether the supply temperature meets the requirements of the suspension bearing. By placing the second temperature sensor 42 between the second throttle valve 22 and the first heat exchanger 21, the temperature of the refrigerant after heat exchange in the first heat exchanger 21 and before entering the second throttle valve 22 can be obtained in real time, thereby determining the heat exchange effect of the first heat exchanger 21 and whether the refrigerant temperature in the cooling branch 2 meets the cooling requirements of the motor and frequency converter. The first temperature sensor 41 and the second temperature sensor 42 are respectively arranged at key positions between the liquid storage tank 32, the second throttle valve 22 and the first heat exchanger 21, realizing separate monitoring of the gas supply temperature of the liquid storage tank 32 and the refrigerant temperature of the cooling branch 2. This provides accurate temperature basis for the system to make corresponding adjustments according to the heating state of the liquid storage tank 32 and the cooling effect of the cooling branch 2, thereby improving the accuracy of system control and operational reliability.

[0041] Please see Figure 1In this embodiment, a third valve body 23 is provided on the pipeline between the condenser 14 and the first heat exchanger 21. This third valve body 23 is used to control the on / off state or flow rate of the high-temperature refrigerant supplied from the condenser 14 to the first heat exchanger 21. The third valve body 23 can be a solenoid valve, which opens or closes the high-temperature refrigerant pipeline via an electrical control signal; alternatively, it can be a ball valve, which adjusts the flow rate of the high-temperature refrigerant by rotating the valve core. A fourth valve body 24 is provided on the pipeline between the evaporator 11 and the first heat exchanger 21. This fourth valve body 24 is used to control the on / off state or flow rate of the low-temperature refrigerant supplied from the evaporator 11 to the first heat exchanger 21. The fourth valve body 24 can be a solenoid valve, which controls the on / off state of the low-temperature refrigerant pipeline via electrical control; alternatively, it can be a ball valve, which adjusts the flow rate of the low-temperature refrigerant. The high-temperature refrigerant discharged from the condenser 14 enters the first heat exchange channel 211 of the first heat exchanger 21 after being controlled by the third valve body 23. The low-temperature refrigerant discharged from the evaporator 11 enters the second heat exchange channel 212 of the first heat exchanger 21 after being controlled by the fourth valve body 24. The third valve body 23 and the fourth valve body 24 independently control the on / off or flow rate of the refrigerant entering the two channels of the first heat exchanger 21.

[0042] By installing a third valve 23 between the condenser 14 and the first heat exchanger 21, the timing and flow rate of high-temperature refrigerant entering the first heat exchanger 21 can be controlled, enabling on-demand opening or adjustment of the high-temperature refrigerant side passage. By installing a fourth valve 24 between the evaporator 11 and the first heat exchanger 21, the timing and flow rate of low-temperature refrigerant entering the first heat exchanger 21 can be controlled, enabling on-demand opening or adjustment of the low-temperature refrigerant side passage. When both the third valve 23 and the fourth valve 24 are solenoid valves, the system can quickly respond to and control the flow of refrigerant on both sides based on the temperature detection signal. The third valve body 23 and the fourth valve body 24 are respectively located between the condenser 14 and the first heat exchanger 21 and between the evaporator 11 and the first heat exchanger 21, realizing independent control of the refrigerant entering the channels on both sides of the first heat exchanger 21. This allows the system to adjust the flow rate or on / off state of the high-temperature refrigerant and the low-temperature refrigerant according to the actual operating conditions, ensuring the refrigerant flow rate matching on both sides of the first heat exchanger 21, improving heat exchange efficiency and control flexibility. At the same time, it is convenient to independently cut off the corresponding refrigerant passage in the system start-up, shutdown or abnormal state, enhancing the safety and reliability of system operation.

[0043] Secondly, please refer to Figures 3 to 5 This embodiment provides a control method based on the above-described air supply system for suspension bearings. The control method is implemented for an air supply system that includes a heating branch 5 between the condenser 14 and the evaporator 11 (on which a second heat exchanger 51 is provided), a heater 34 in the liquid storage tank 32, and a first heat exchanger 21 having a first heat exchange channel 211 and a second heat exchange channel 212.

[0044] Step S100: Control the main refrigeration cycle 1 to start, so that the compressor 12, condenser 14, evaporator 11 and the first throttle valve 15 establish a basic refrigeration cycle, providing a refrigerant circulation basis for system operation.

[0045] In step S200, the gas supply branch 3 and the cooling branch 2 are opened, and the heater 34 is turned on, so that the liquid refrigerant in the liquid storage tank 32 is heated and evaporated into gaseous state under the action of the heater 34. The gaseous refrigerant is supplied to the suspension bearing through the gas supply branch 3 to realize the bearing gas supply in the initial stage of unit start-up. The opening of the gas supply branch 3 can be achieved by controlling the third throttle valve 31 to conduct, the opening of the cooling branch 2 can be achieved by controlling the second throttle valve 22, and the opening of the heater 34 can be triggered by an electronic control signal.

[0046] In step S300, the first threshold can be a preset temperature value of the cooling branch 2 pipe. When the temperature of the cooling branch 2 is detected to reach the first threshold, it indicates that the temperature of the refrigerant in the cooling branch 2 has reached or exceeded the upper limit of the temperature required for cooling the motor and the frequency converter. At this time, the opening of the fourth valve body 24 is increased to increase the flow rate of the low-temperature refrigerant flowing through the second heat exchange channel 212, that is, to increase the supply of low-temperature refrigerant from the evaporator 11 to the second heat exchange channel 212 of the first heat exchanger 21, so as to enhance the cooling effect on the high-temperature refrigerant from the condenser 14 in the first heat exchange channel 211. At the same time, the first valve body 52 can also be opened to open the heating branch 5, so that the high-temperature refrigerant drawn out from the condenser 14 enters the second heat exchanger 51 located in the liquid storage tank 32, and the liquid refrigerant in the liquid storage tank 32 is heated by the high-temperature heat source of the condenser 14 itself. Conversely, when the temperature of cooling branch 2 is detected to be less than the first threshold, it indicates that the refrigerant temperature in cooling branch 2 has not exceeded the upper limit of the temperature required for cooling the motor and frequency converter. At this time, the opening of the fourth valve body 24 is reduced to reduce the flow rate of the low-temperature refrigerant flowing through the second heat exchange channel 212, that is, to reduce the supply of low-temperature refrigerant from the evaporator 11 to the second heat exchange channel 212 of the first heat exchanger 21, so as to weaken the cooling effect on the high-temperature refrigerant from the condenser 14 in the first heat exchange channel 211; at the same time, the first valve body 52 can be closed to shut down the heating branch 5.

[0047] In step S400, when the temperature of the liquid storage tank 32 reaches the second threshold, it indicates that the heat provided by the second heat exchanger 51 is sufficient to maintain the evaporation gas supply demand of the liquid refrigerant in the liquid storage tank 32. At this time, the opening of the first valve body 52 remains unchanged to maintain the refrigerant flow in the gas supply branch 3 and the heater 34 is turned off to stop the use of electric heating. When the temperature of the liquid storage tank 32 is detected to be lower than the third threshold, it indicates that the heat provided by the second heat exchanger 51 is insufficient. At this time, the heater 34 is controlled to turn on auxiliary heating to supplement the heating of the liquid refrigerant in the liquid storage tank 32. The second threshold and the third threshold can be preset temperature values ​​of the refrigerant in the liquid storage tank 32, and the second threshold is higher than the third threshold to form a temperature control range. When the temperature of the liquid storage tank 32 is lower than the second threshold but not lower than the third threshold, the flow of the heating branch is increased. When the temperature of the liquid storage tank 32 is lower than the third threshold, the heater is turned on based on the increased flow of the heating branch.

[0048] In step S500, the main refrigeration cycle 1 is shut down. During normal system shutdown, heating branch 5 remains open, and heater 34 is activated. This allows the second heat exchanger 51 and heater 34 to jointly heat the liquid refrigerant in the storage tank 32. Gas is continuously supplied to the suspension bearing via gas supply branch 3 until the rotor of the suspension bearing stops rotating, thus providing bearing protection gas supply during shutdown. Through the combination of the above control steps, the system operates according to the following sequential logic: "start-up, initial electric heating gas supply, activation of the first heat exchanger for heat exchange and condensation heating after the cooling branch 2 reaches the target temperature, shutdown of electric heating after the storage tank 32 reaches the target temperature, electric heating assistance when the temperature is insufficient, and continuous combined heating gas supply after shutdown." This achieves segmented control of the gas supply system under different operating conditions.

[0049] This embodiment establishes the basic refrigeration cycle for system operation by controlling the activation of the main refrigeration cycle 1, providing a refrigerant source and pressure foundation for the subsequent cooling branch 2, gas supply branch 3, and heating branch 5. By controlling the activation of the gas supply branch 3 and cooling branch 2, and activating the heater 34, a cooling and gas supply path is established at the initial stage of system startup. Simultaneously, the heater 34 directly heats the liquid refrigerant in the storage tank 32, ensuring that the suspension bearing can obtain a stable gas source in a timely manner during the unit startup phase. By setting the temperature of cooling branch 2 to reach a first threshold, the flow rate of low-temperature refrigerant in the second heat exchange channel 212 is increased, and the heating branch 5 is activated. This allows the system to automatically adjust the heat exchange intensity of the first heat exchanger 21 according to the actual temperature of cooling branch 2. At the same time, the high-temperature refrigerant discharged from the condenser 14 is used to heat the storage tank 32 through the second heat exchanger 51, realizing the linkage response between cooling and heating demands. By setting the heater 34 to shut off when the temperature of the liquid storage tank 32 reaches a second threshold and stopping electric heating when the second heat exchanger 51 can provide sufficient heat, the operating time and energy consumption of the heater 34 are reduced. By setting the auxiliary heating of the heater 34 to start when the temperature of the liquid storage tank 32 is below a third threshold and automatically activating the heater 34 to supplement heat when the second heat exchanger 51 is insufficient, the continuity and stability of the gas supply to the liquid storage tank 32 are ensured. By controlling the main refrigeration cycle 1 to remain open after it is shut down, and keeping the heating branch 5 and heater 34 open and continuously supplying gas until the rotor stops rotating, a stable gas source is ensured for the suspension bearing during rotor coasting during shutdown, preventing rotor damage from falling. This control method, through temperature threshold triggering and a phased control strategy, achieves automated gas supply management throughout the system startup, stable operation, and shutdown processes. While ensuring the stability of the gas supply to the suspension bearing, it effectively utilizes the unit's own high-temperature heat source to replace or assist electric heating, reducing system energy consumption and improving operational reliability.

[0050] Please see Figures 3 to 5In one embodiment, the temperature of the liquid storage tank 32 is detected by a temperature detection component 4. This component 4 may include a first temperature detection element 41 disposed on the liquid storage tank 32 to acquire the temperature status of the refrigerant or the tank body within the liquid storage tank 32 in real time. A second threshold is set as the criterion for judging the temperature of the liquid storage tank 32. This second threshold can be preset based on the minimum temperature required for the evaporation of the liquid refrigerant in the liquid storage tank 32 or the lower limit of the target gas supply temperature. When the temperature of the liquid storage tank 32 is detected to be lower than the second threshold, it indicates that the heat provided by the second heat exchanger 51 to the liquid storage tank 32 is insufficient, and the evaporation rate of the liquid refrigerant in the liquid storage tank 32 decreases or the temperature is too low. At this time, the flow rate of the heating branch 5 is increased, that is, by adjusting the valve opening on the heating branch 5, the flow rate of the high-temperature refrigerant supplied by the condenser 14 to the second heat exchanger 51 is increased. The heating branch 5 is provided with a first valve body 52 (solenoid valve or ball valve), and the flow rate is increased by increasing the opening of the solenoid valve or ball valve or increasing its duty cycle. Temperature detection component 4 continuously detects the temperature of liquid storage tank 32. When the temperature is lower than the preset second threshold, the system automatically controls the flow rate of heating branch 5 to increase, so that more high-temperature refrigerant flows through the second heat exchanger 51, thereby increasing the heat transferred from the second heat exchanger 51 to the liquid refrigerant in the liquid storage tank 32.

[0051] By detecting the temperature of the liquid storage tank 32, the heating status and temperature level of the refrigerant inside the tank can be monitored in real time, providing accurate temperature feedback for system control. By setting a second threshold, a quantitative standard for judging whether the heat inside the liquid storage tank 32 is sufficient is established, enabling the system to make logical judgments based on the actual temperature of the tank. By setting the flow rate of the heating branch 5 to increase when the temperature of the liquid storage tank 32 is lower than the second threshold, the system achieves an automatic response to low temperatures in the liquid storage tank 32, enhancing its heating capacity without manual intervention. Increasing the flow rate of the heating branch 5 allows more high-temperature refrigerant discharged from the condenser 14 to flow through the second heat exchanger 51, thereby increasing the heat exchange between the second heat exchanger 51 and the liquid refrigerant inside the liquid storage tank 32, promoting the evaporation of the liquid refrigerant. The control logic, through the closed-loop coordination of temperature detection in the liquid storage tank 32, second threshold judgment, and flow regulation in the heating branch 5, prioritizes increasing the flow rate in the heating branch 5 to enhance the heating capacity of the second heat exchanger 51 when the temperature of the liquid storage tank 32 is insufficient. It makes full use of the high-temperature refrigerant heat source discharged from the unit's own condenser 14, maintaining the continuous evaporation of liquid refrigerant in the liquid storage tank 32 and ensuring the stability of the air supply to the suspension bearing, while reducing the dependence on the electric heater 34 and lowering the system energy consumption.

[0052] Please see Figures 3 to 5In this embodiment, the control method further includes an emergency gas supply control step after a unit failure shutdown or power outage. A unit failure shutdown can be a compressor 12 failure shutdown, a refrigeration main cycle 1 pressure abnormality shutdown, or a protective shutdown triggered by a control system failure. The heater 34 in the gas supply system and all valves in the system are powered by an additional power source to ensure normal gas supply even during a power outage. Upon detecting the aforementioned shutdown condition, the system controls the heater 34 to activate, supplying power to the heater 34 located in the liquid storage tank 32 to put it into operation. The heater 34 can be an electric heating rod or an electric heating coil, which heats up after being energized and directly heats the surrounding liquid refrigerant; the coiled structure can also increase the contact area with the liquid refrigerant. After the heater 34 is activated, it directly heats the liquid refrigerant in the liquid storage tank 32, causing it to evaporate and turn into a gaseous state. The heater 34 can be immersed in the liquid refrigerant at the bottom of the liquid storage tank 32, directly heating the liquid refrigerant through heat conduction. The gaseous refrigerant generated by evaporation is supplied to the suspension bearing through gas supply branch 3. The gaseous refrigerant can enter the air inlet of the suspension bearing through the outlet of the liquid storage tank 32 and the corresponding pipeline. The heater 34 continuously heats and supplies gas until the rotor of the suspension bearing stops rotating. Whether the rotor has stopped rotating can be determined by monitoring the speed of the compressor 12 or the vibration signal of the suspension bearing; by setting a delay time, heating and gas supply can continue for a period of time after shutdown until the rotor completely coasts to a stop. After the unit fails to shut down or is shut down due to power failure, the system immediately controls the heater 34 to turn on. The heater 34 directly heats the liquid refrigerant in the liquid storage tank 32 to generate gas, which is continuously supplied to the suspension bearing through gas supply branch 3 until the rotor completely stops rotating.

[0053] By adding emergency control steps to the control method after unit failure or power outage shutdown, the system retains bearing protection capabilities under abnormal shutdown conditions. By controlling the heater 34 to activate under these conditions, the heater 34 built into the liquid storage tank 32 can be immediately activated as an independent heat source when the main refrigeration cycle 1 stops operating and the second heat exchanger 51 cannot obtain a high-temperature refrigerant heat source. The heater 34 heats the liquid refrigerant in the liquid storage tank 32, ensuring that the tank continues to produce gaseous refrigerant after an abnormal shutdown, maintaining gas supply capacity. By supplying the generated gaseous refrigerant to the suspension bearing, a stable gas source support is ensured during rotor coasting after shutdown. Continuous gas supply until the suspension bearing rotor stops rotating prevents the rotor from falling or wearing due to loss of gas source support before it has completely stopped. This control method controls the heater 34 to turn on and continuously supply air until the rotor stops rotating after a fault shutdown or power failure. In abnormal operating conditions where neither the main refrigeration cycle 1 nor the condensation heating branch 5 can work properly, the built-in heater 34 in the liquid storage tank 32 is used as an emergency heat source to ensure continuous air supply to the suspension bearing during the stop coasting period, prevent the rotor from falling and being damaged, and improve the safety and reliability of the system.

[0054] This embodiment provides a compressor, which includes a suspension bearing, a motor, a frequency converter, and a gas supply system for the suspension bearing provided in the first aspect of this application. The suspension bearing is a non-contact bearing that uses gas pressure to suspend the rotor, and is located at both ends of the compressor rotor or at key support positions to support the rotor and achieve oil-free operation. The motor is a power component that drives the compressor rotor to rotate and is connected to the rotor drive. The frequency converter is an electrical device that controls the motor speed and is electrically connected to the motor to adjust its operating frequency. The gas supply system for the suspension bearing is the system described in the first aspect of this application, including a refrigeration main cycle, a cooling branch, a gas supply branch, a temperature detection component, a heating branch, and corresponding valve bodies, heat exchangers, and other components. This gas supply system is integrated with the compressor's suspension bearing, motor, and frequency converter, providing a stable gas source for the suspension bearing and providing cooling to the motor and frequency converter through the cooling branch. When the compressor is running, the air supply system provides a stable air source to the suspension bearing to suspend the rotor. At the same time, the cooling branch uses low-temperature refrigerant to cool the motor and frequency converter. The temperature detection component monitors key temperature nodes. The heating branch uses high-temperature refrigerant from the condenser to heat the liquid storage tank. The heater serves as an auxiliary or emergency heat source. All components work together to ensure the stable operation of the compressor.

[0055] This application enables the compressor rotor to operate in a non-contact, suspended manner by incorporating a floating bearing, eliminating the mechanical friction and lubrication requirements of traditional bearings and improving compressor efficiency and reliability. A motor provides rotational drive to the compressor rotor, enabling refrigerant compression. A frequency converter allows for adjustment of the motor's operating speed, adapting the compressor to different refrigeration loads. By integrating the air supply system for the floating bearing provided in the first aspect of this application into the compressor, the compressor possesses its own bearing air supply and motor cooling capabilities, eliminating the need for external independent air supply or cooling equipment. Through the integrated design of the floating bearing, motor, frequency converter, and air supply system, this compressor achieves highly efficient, oil-free operation while simultaneously enabling integrated management of bearing air supply and motor cooling via the air supply system. This simplifies the compressor's system configuration and improves the overall integration and operational stability.

[0056] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0057] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0058] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An air supply system for a suspension bearing, characterized in that, include: The refrigeration main cycle (1) includes an evaporator (11), a compressor (12), a check valve (13), a condenser (14), and a first throttle valve (15) connected in sequence. The compressor (12) includes a suspension bearing, a motor, and a frequency converter. Cooling branch (2), the cooling branch (2) includes a first heat exchanger (21) connected to the condenser (14) and a second throttle valve (22) connected to the compressor (12), the first heat exchanger (21) is connected to the second throttle valve (22), the cooling branch (2) is used to cool the motor and the frequency converter; the first heat exchanger (21) is connected to the evaporator (11), the low temperature refrigerant of the evaporator (11) can exchange heat with the high temperature refrigerant of the condenser (14) to reduce the temperature of the refrigerant in the cooling branch (2); Gas supply branch (3), the gas supply branch (3) is located between the first heat exchanger (21) and the second throttle valve (22), the gas supply branch (3) includes a third throttle valve (31) and a liquid storage tank (32) connected in sequence, the liquid storage tank (32) is used to store liquid refrigerant, the liquid storage tank (32) is used to heat the liquid refrigerant inside and supply it to the suspension bearing; Temperature detection component (4) is used to detect the temperature of the liquid storage tank (32) and / or the cooling branch (2).

2. The air supply system for a suspension bearing according to claim 1, characterized in that, The first heat exchanger (21) has a first heat exchange channel (211) and a second heat exchange channel (212). The first heat exchange channel (211) is used to connect with the condenser (14) to introduce high-temperature refrigerant, and the second heat exchange channel (212) is used to connect with the evaporator (11) to introduce low-temperature refrigerant. The first heat exchange channel (211) and the second heat exchange channel (212) exchange heat to reduce the temperature of the high-temperature refrigerant.

3. The air supply system for a suspension bearing according to claim 1, characterized in that, A heating branch (5) is provided between the condenser (14) and the evaporator (11). A second heat exchanger (51) is provided on the heating branch (5). The second heat exchanger (51) is located in the liquid storage tank (32). The refrigerant in the heating branch (5) flows from the condenser (14), through the second heat exchanger (51), and then flows back to the evaporator (11).

4. The air supply system for a suspension bearing according to claim 3, characterized in that, A first valve body (52) is provided between the condenser (14) and the liquid storage tank (32), and a second valve body (33) is provided between the outlet of the liquid storage tank (32) and the suspension bearing.

5. The air supply system for a suspension bearing according to claim 1, characterized in that, The storage tank (32) is equipped with a heater (34).

6. The air supply system for a suspension bearing according to claim 1, characterized in that, The temperature detection component (4) includes a first temperature detection element (41) and a second temperature detection element (42). The first temperature detection element (41) is located in the liquid storage tank (32), and the second temperature detection element (42) is located between the second throttle valve (22) and the first heat exchanger (21).

7. The air supply system for a suspension bearing according to claim 1, characterized in that, A third valve body (23) is provided between the condenser (14) and the first heat exchanger (21), and a fourth valve body (24) is provided between the evaporator (11) and the first heat exchanger (21).

8. A control method for an air supply system for a suspension bearing based on any one of claims 1-7, characterized in that, The air supply system for the suspension bearing includes a heating branch (5) located between the condenser (14) and the evaporator (11), a second heat exchanger (51) is provided on the heating branch (5), a heater (34) is provided in the liquid storage tank (32), the first heat exchanger (21) has a first heat exchange channel (211) and a second heat exchange channel (212), and the control method includes: Control the start of the main cooling cycle (1); Control the opening of the gas supply branch (3) and the cooling branch (2), and turn on the heater (34) so ​​that the liquid refrigerant in the storage tank (32) is heated into a gaseous state and then supplied to the suspension bearing; When the temperature of the cooling branch (2) is detected to reach the first threshold, the flow rate of the low-temperature refrigerant flowing through the second heat exchange channel (212) is increased, and the heating branch (5) is opened, so that the high-temperature refrigerant drawn from the condenser (14) enters the second heat exchanger (51) to heat the liquid refrigerant in the storage tank (32). When the temperature of the liquid storage tank (32) is detected to reach the second threshold, the refrigerant flow in the gas supply branch (3) is maintained and the heater (34) is turned off; when the temperature of the liquid storage tank (32) is detected to be lower than the third threshold, the auxiliary heating of the heater (34) is turned on. The main cooling cycle (1) is shut down, the heating branch (5) is kept open and the heater (34) is started to heat the liquid refrigerant in the storage tank (32) together, and the refrigerant is supplied to the suspension bearing through the gas supply branch (3) until the rotor of the suspension bearing stops rotating.

9. The control method according to claim 8, characterized in that, When the temperature of the storage tank (32) is detected to be lower than the second threshold, the flow rate of the heating branch (5) is increased.

10. The control method according to claim 8, characterized in that, Also includes: After the unit stops due to a malfunction or power failure, the heater (34) is turned on to heat the liquid refrigerant in the storage tank (32) and supply it to the suspension bearing until the rotor of the suspension bearing stops rotating.

11. A compressor, characterized in that, It includes a suspension bearing, a motor, a frequency converter, and an air supply system for the suspension bearing as described in any one of claims 1-7.

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