Air suspension bearing air supply system and refrigeration equipment

Abstract

The utility model provides an air suspension bearing air supply system and refrigeration equipment. The air suspension bearing air supply system comprises a compressor, a condenser and an evaporator, a shell of the compressor is provided with a bearing cavity, and a rotor is supported by an air suspension bearing arranged in the bearing cavity; a gas supply tank; the air supply tank is connected with the bearing cavity through the air supply pipeline; the inlet end of the exhaust pipeline is connected with the bearing cavity, and the outlet end is connected with the evaporator; the inlet end of the first refrigerant pipeline is connected with the condenser and configured to lead out a liquid refrigerant in the condenser, and the outlet end of the first refrigerant pipeline is connected with the gas supply tank; the inlet end of the second refrigerant pipeline is connected with the condenser and configured to lead out the gaseous refrigerant in the condenser, and the outlet end of the second refrigerant pipeline is connected with the gas supply tank; the condenser selectively provides refrigerants for the air supply tank through the first refrigerant pipeline and the second refrigerant pipeline, so that the gaseous refrigerants in the air supply tank are supplied to the bearing cavity through the air supply pipeline. According to the scheme, the air supply stability of the air suspension bearing air supply system can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of air suspension compressors, and particularly to an air suspension bearing air supply system and refrigeration equipment. Background Technology

[0002] Centrifugal chillers are now widely used in air conditioning systems for various buildings, including industrial, commercial, and residential buildings, and their reliability is widely recognized in the market. Typically, the compressor bearings in centrifugal chillers mainly use oil-lubricated bearings, magnetic bearings, and air-suspended bearings.

[0003] Air bearings utilize gas force to support the rotating shaft, offering the following advantages: 1. Compared to compressors using oil-lubricated bearings, they eliminate the need for oil supply, return, and cooling systems, thus eliminating the risk of lubricant leakage and saving on lubrication maintenance. During operation, the bearing is suspended, resulting in zero friction, reduced mechanical losses, and improved unit performance; 2. Compared to compressors using magnetic bearings, they eliminate the need for complex electrical control systems and abnormal power failure protection systems, and the bearing size is relatively smaller.

[0004] Based on the working principle of air bearings, which utilize gas force to support the shaft, the air supply system directly affects the reliability and operating range of the air bearing. To ensure the normal operation of air bearings, a reliable and stable air supply system is required. However, current air supply systems still need improvement in terms of stability. Utility Model Content

[0005] The purpose of this disclosure is to provide an air supply system and refrigeration equipment for air suspension bearings, so as to improve the stability of the air supply system for air suspension bearings.

[0006] The first aspect of this disclosure provides an air suspension bearing air supply system for supplying air to the air suspension bearing of a compressor in a refrigeration circuit, comprising:

[0007] A compressor, condenser, and evaporator for forming a refrigeration circuit, the compressor including a housing, a rotor, and an air-suspended bearing, the housing having a bearing cavity, the rotor being supported by the air-suspended bearing disposed in the bearing cavity;

[0008] Gas supply tank;

[0009] An air supply pipeline is provided, and the air supply tank is connected to the bearing cavity through the air supply pipeline.

[0010] The exhaust pipe has its inlet end connected to the bearing cavity and its outlet end connected to the evaporator.

[0011] A first refrigerant line, with its inlet end connected to the condenser and configured to draw out liquid refrigerant from the condenser, and its outlet end connected to the gas supply tank; and

[0012] The second refrigerant line has its inlet end connected to the condenser and configured to draw out the gaseous refrigerant in the condenser, and its outlet end connected to the gas supply tank.

[0013] The condenser can selectively supply refrigerant to the gas supply tank through the first refrigerant line and the second refrigerant line, so that the gaseous refrigerant in the gas supply tank is supplied to the bearing cavity through the gas supply line.

[0014] In some embodiments, the first refrigerant line is provided with a refrigerant pump, which is configured to deliver liquid refrigerant from the condenser to the gas supply tank; and / or, the second refrigerant line is provided with a control valve, which is configured to control the connection or disconnection of the inlet and outlet ends of the second refrigerant line.

[0015] In some embodiments, the air suspension bearing air supply system includes:

[0016] A condensing pressure detection device is configured to detect the gas pressure P1 of the gaseous refrigerant inside the condenser;

[0017] The gas supply tank pressure detection device is configured to detect the gas pressure P2 inside the gas supply tank;

[0018] A bearing cavity pressure detection device is configured to detect the gas pressure P3 at the gas outlet of the bearing cavity; and

[0019] The control device, connected to the condensing pressure detection device, the gas supply tank pressure detection device, the bearing cavity pressure detection device, the refrigerant pump, and the control valve, is configured to determine whether the refrigerant pump starts and whether the control valve connects the inlet and outlet ends of the second refrigerant pipeline based on the difference ΔP2 between the gas pressure P1 and the gas pressure P3, the difference ΔP0 between the gas pressure P2 and the gas pressure P3, and the target gas supply pressure difference ΔP.

[0020] In some embodiments, the air suspension bearing air supply system includes:

[0021] The gas supply tank pressure detection device is configured to detect the gas pressure P2 inside the gas supply tank;

[0022] A bearing cavity pressure detection device is configured to detect the gas pressure P3 at the gas outlet of the bearing cavity; and

[0023] The control device, together with the gas supply tank pressure detection device and the bearing cavity pressure detection device, is configured to adjust the frequency of the refrigerant pump based on the difference ΔP0 between the gas pressure P2 and the gas pressure P3 and the target gas supply pressure difference ΔP when the refrigerant pump is started.

[0024] In some embodiments, the control device is signal-connected to the compressor and configured to obtain the target gas supply pressure difference ΔP based on the compressor's operating frequency F1.

[0025] In some embodiments, the air suspension bearing air supply system includes:

[0026] The compressor, condenser, and evaporator are sequentially connected to form the refrigeration circuit; and

[0027] The control device, which is signal-connected to the refrigerant pump, the control valve, and the throttle valve, is configured to, when the refrigerant pump is in an abnormal operating state, cause the control valve to connect the inlet and outlet ends of the second refrigerant pipeline, de-energize the compressor, and close the throttle valve.

[0028] In some embodiments, the compressor has a motor cavity communicating with the bearing cavity, and the outlet of the gas supply line is located in the motor cavity so that the gaseous refrigerant supplied by the gas supply tank flows from the motor cavity into the bearing cavity.

[0029] A second aspect of this disclosure provides a refrigeration device, including the air suspension bearing air supply system described in the first aspect of this disclosure.

[0030] The air suspension bearing air supply system disclosed herein has two paths for supplying air to the air suspension bearing. In the first path, the refrigerant flows sequentially through the condenser, the first refrigerant line, the air supply tank, the air supply line, the bearing cavity, the exhaust line, and the evaporator. Under the action of the refrigerant pump, the liquid refrigerant in the condenser enters the air supply tank, pressurizing the gaseous refrigerant there. The gaseous refrigerant in the air supply tank then enters the air supply line under the pressure of the liquid refrigerant, and is subsequently supplied to the bearing cavity. In the second path, the refrigerant flows sequentially through the condenser, the second refrigerant line, the air supply tank, the air supply line, the bearing cavity, the exhaust line, and the evaporator. Due to the continuous work of the compressor, the pressure of the gaseous refrigerant in the condenser is higher than the pressure of the gaseous refrigerant in the air supply tank and the bearing cavity. Under the action of this pressure difference, the gaseous refrigerant can be supplied to the bearing cavity through the second refrigerant line, the air supply tank, and the air supply line.

[0031] Considering that the pressure difference between the gaseous refrigerant in the condenser and the gaseous refrigerant in the gas supply tank and bearing cavity changes accordingly under different compressor operating conditions, when the pressure difference is insufficient to guarantee the stiffness requirements of the air suspension bearing, gas can be supplied through the first path, that is, by using the pressure of the liquid refrigerant to generate a pressure difference for supplying gas to the air suspension bearing. When the pressure difference is sufficient to guarantee the stiffness requirements of the air suspension bearing, gas can be supplied through the second path, that is, by directly utilizing the pressure difference to supply gas to the air suspension bearing. Therefore, regardless of the compressor's operating state, the air suspension bearing gas supply system provided in this disclosure can generate a sufficient pressure difference to achieve stable gas supply and meet the stiffness requirements of the air suspension bearing. Furthermore, regardless of the gas supply method used, the gas supply tank itself can store a certain volume of gaseous refrigerant, which can play a role in balancing airflow and stabilizing gas pressure, thus helping to ensure the continuity and reliability of the gas supply.

[0032] The refrigeration equipment provided in this disclosure has the advantages of the air suspension bearing system provided in this disclosure because it adopts the air suspension bearing system provided in this disclosure.

[0033] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings:

[0035] Figure 1 This is a schematic diagram of the air supply system for an air suspension bearing according to some embodiments of this disclosure.

[0036] Figure 1 In the figures, the labels represent:

[0037] 1. Compressor; 2. Condenser; 3. Throttling valve; 4. Evaporator; 5. Control valve; 6. Refrigerant pump; 7. First filter; 8. Gas supply tank; 9. Check valve; 10. Second filter; 11. Condensing pressure detection device; 12. Gas supply tank pressure detection device; 13. Bearing cavity pressure detection device; L1, First refrigerant line; L2, Second refrigerant line; L3, Gas supply line; L4, Exhaust line; C, Refrigeration circuit. Detailed Implementation

[0038] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0039] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0040] In the description of this disclosure, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0041] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0042] refer to Figure 1Some embodiments of this disclosure provide an air suspension bearing air supply system for supplying air to the air suspension bearing of compressor 1 in a refrigeration circuit C. The air suspension bearing air supply system includes compressor 1, condenser 2 and evaporator 4 for forming the refrigeration circuit C, as well as compressor 1, air supply tank 8, air supply line L3, exhaust line L4, first refrigerant line L1 and second refrigerant line L2.

[0043] The compressor 1 includes a housing, a rotor, and an air-suspended bearing. The housing has a bearing cavity, and the rotor is supported by the air-suspended bearing disposed in the bearing cavity. A refrigerant supply tank 8 is connected to the bearing cavity via a refrigerant supply line L3. The inlet end of the exhaust line L4 is connected to the bearing cavity, and the outlet end is connected to the evaporator 4. The inlet end of the first refrigerant line L1 is connected to the condenser 2 and configured to draw out liquid refrigerant from the condenser 2, and the outlet end is connected to the refrigerant supply tank 8. The inlet end of the second refrigerant line L2 is connected to the condenser 2 and configured to draw out gaseous refrigerant from the condenser 2, and the outlet end is connected to the refrigerant supply tank 8. The condenser 2 can selectively supply refrigerant to the refrigerant supply tank 8 via the first refrigerant line L1 and the second refrigerant line L2, so that the gaseous refrigerant in the refrigerant supply tank 8 is supplied to the bearing cavity via the refrigerant supply line L3.

[0044] Optionally, a check valve 9 is provided in the refrigeration circuit C between the compressor 1 and the condenser 2, and the check valve 9 is connected from the compressor 1 to the condenser 2.

[0045] The condenser 2 can selectively supply refrigerant to the gas supply tank 8 through the first refrigerant line L1 and the second refrigerant line L2. This means that the condenser 2 can supply refrigerant to the gas supply tank 8 through one of the first refrigerant line L1 and the second refrigerant line L2 alone, or it can supply refrigerant to the gas supply tank 8 through the first refrigerant line L1 and the second refrigerant line L2 simultaneously.

[0046] Figure 1 In the diagram, the arrows indicate the direction of refrigerant flow. The air suspension bearing air supply system provided in the embodiments of this disclosure has two paths for supplying air to the air suspension bearing. For the first path, the refrigerant flows sequentially along the condenser 2, the first refrigerant line L1, the air supply tank 8, the air supply line L3, the bearing cavity, the exhaust line L4, and the evaporator 4. Under the action of the refrigerant pump 6, the liquid refrigerant in the condenser 2 enters the air supply tank 8, pressurizing the gaseous refrigerant in the air supply tank 8. Under the pressure of the liquid refrigerant, the gaseous refrigerant in the air supply tank 8 enters the air supply line L3, and is then supplied to the bearing cavity. For the second path, the refrigerant flows in the following order: condenser 2, second refrigerant line L2, gas supply tank 8, gas supply line L3, bearing cavity, exhaust line L4, and evaporator 4. As the compressor 1 continuously performs work, the pressure of the gaseous refrigerant in the condenser 2 is higher than the pressure of the gaseous refrigerant in the gas supply tank 8 and the bearing cavity. Under the action of the pressure difference, the gaseous refrigerant can be supplied to the bearing cavity through the second refrigerant line L2, gas supply tank 8, and gas supply line L3.

[0047] Considering that the pressure difference between the gaseous refrigerant in the condenser 2 and the gaseous refrigerant in the gas supply tank 8 and the bearing cavity changes accordingly under different operating conditions of the compressor 1, when the pressure difference is insufficient to guarantee the stiffness requirements of the air suspension bearing, gas can be supplied through the first path, that is, by using the pressure of the liquid refrigerant to generate a pressure difference to supply gas to the air suspension bearing. When the pressure difference is sufficient to guarantee the stiffness requirements of the air suspension bearing, gas can be supplied through the second path, that is, by directly using the pressure difference to supply gas to the air suspension bearing. Therefore, regardless of the operating state of the compressor 1, the air suspension bearing gas supply system provided by the embodiments of this disclosure can generate a sufficient pressure difference to achieve stable gas supply and meet the stiffness requirements of the air suspension bearing. Furthermore, regardless of the gas supply method used, the gas supply tank 8 itself can store a certain volume of gaseous refrigerant, which can play a role in balancing airflow and stabilizing gas pressure, thus helping to ensure the continuity and reliability of gas supply.

[0048] In some embodiments, the first refrigerant line L1 is provided with a refrigerant pump 6, which is configured to deliver liquid refrigerant from the condenser 2 to the gas supply tank 8.

[0049] In some embodiments, the second refrigerant line L2 is provided with a control valve 5, which is configured to control the connection or disconnection of the inlet and outlet ends of the second refrigerant line L2.

[0050] In this embodiment, when the refrigerant pump 6 starts, the condenser 2 can supply liquid refrigerant to the gas supply tank 8 through the first refrigerant line L1; when the refrigerant pump 6 stops working, the condenser 2 no longer supplies liquid refrigerant to the gas supply tank 8 through the first refrigerant line L1. By changing the operating state of the control valve 5, when both ends of the second refrigerant line L2 are connected and the pressure difference between the gaseous refrigerant in the condenser 2 and the gaseous refrigerant in the gas supply tank 8 and the bearing cavity is large enough, the condenser 2 can supply gaseous refrigerant to the gas supply tank 8 through the second refrigerant line L2; when both ends of the second refrigerant line L2 are disconnected, the condenser 2 no longer supplies liquid refrigerant to the gas supply tank 8 through the second refrigerant line L2.

[0051] Optionally, the first refrigerant line L1 is equipped with a first filter 7, which is located upstream of the refrigerant pump 6 along the refrigerant flow direction. Optionally, the gas supply line L3 is equipped with a second filter 10. The first filter 7 and the second filter 10 can filter the refrigerant in their respective lines, thereby ensuring the reliability of the refrigerant pump 6 and the compressor 1.

[0052] In some embodiments, the air suspension bearing air supply system includes a condensing pressure detection device 11, an air supply tank pressure detection device 12, a bearing cavity pressure detection device 13, and a control device. The condensing pressure detection device 11 is configured to detect the gas pressure P1 of the gaseous refrigerant in the condenser 2. The air supply tank pressure detection device 12 is configured to detect the gas pressure P2 in the air supply tank 8. The bearing cavity pressure detection device 13 is configured to detect the gas pressure P3 at the gas outlet of the bearing cavity. The control device is signal-connected to the condensing pressure detection device 11, the bearing cavity pressure detection device 13, the refrigerant pump 6, and the control valve 5, and is configured to determine whether the refrigerant pump 6 is started and whether the control valve 5 connects the inlet and outlet ends of the second refrigerant pipeline L2 based on the difference between gas pressure P1 and gas pressure P3 (ΔP2), the difference between gas pressure P2 and gas pressure P3 (ΔP0), and the target air supply pressure difference (ΔP).

[0053] In the description of this disclosure, the target gas supply pressure difference ΔP is a calculated value, the specific value of which can be determined according to the model and operating status of compressor 1.

[0054] The air supply pressure difference is a direct factor affecting the stiffness of the air suspension bearing. In this embodiment, if the difference between air pressure P1 and air pressure P3, ΔP2, is greater than the target air supply pressure difference, ΔP, and can be maintained for a preset time T1, it indicates that the pressure difference generated by the current work of compressor 1 is sufficient to maintain the normal and stable operation of the air suspension bearing. At this time, refrigerant pump 6 stops working, control valve 5 connects the inlet and outlet ends of the second refrigerant pipeline L2, and air supply tank 8 supplies air to the air suspension bearing based on the pressure difference, which can meet the air supply pressure requirements. If the difference between air pressure P1 and air pressure P3, ΔP2, is less than the target supply pressure difference, ΔP, it indicates that the pressure difference generated by the compressor 1 is insufficient to maintain the normal operation of the air suspension bearing. At this time, the refrigerant pump 6 starts at a certain frequency, and the control valve 5 connects the inlet and outlet of the second refrigerant pipeline L2. The air supply tank 8 simultaneously supplies air to the air suspension bearing based on the pressure difference and the action of the refrigerant pump 6, ensuring sufficient supply pressure. If, after a period of time, the difference between air pressure P2 and air pressure P3, ΔP0, is greater than the target supply pressure difference, the control valve 5 disconnects the inlet and outlet of the second refrigerant pipeline L2. The air supply tank 8 then supplies air to the air suspension bearing based on the action of the refrigerant pump 6, thus meeting the supply pressure requirements.

[0055] In some embodiments, the air suspension bearing air supply system includes an air tank pressure detection device 12, a bearing cavity pressure detection device 13, and a control device. The air tank pressure detection device 12 is configured to detect the air pressure P2 within the air tank 8. The bearing cavity pressure detection device 13 is configured to detect the air pressure P3 at the gas outlet of the bearing cavity. The control device, along with the air tank pressure detection device 12 and the bearing cavity pressure detection device 13, is configured to adjust the frequency of the refrigerant pump 6 when the refrigerant pump 6 is running, based on the difference ΔP0 between air pressure P2 and air pressure P3 and the target air supply pressure difference ΔP.

[0056] Optionally, when the refrigerant pump 6 starts, the frequency of the refrigerant pump 6 is set to an initial frequency F2.

[0057] In this embodiment, when the refrigerant pump 6 is running, if the difference between gas pressure P2 and gas pressure P3, ΔP0, is greater than the target gas supply pressure difference, ΔP, it indicates that the refrigerant pump 6 has sufficient gas supply pressure at the current operating frequency. In this case, appropriately reducing the frequency of the refrigerant pump 6 can also meet the gas supply pressure requirement. If the difference between gas pressure P2 and gas pressure P3, ΔP0, is less than the target gas supply pressure difference, it indicates that the refrigerant pump 6 has insufficient gas supply pressure at the current operating frequency. In this case, it is necessary to appropriately increase the frequency of the refrigerant pump 6 to meet the gas supply pressure requirement.

[0058] In some embodiments, the control device is signal-connected to the compressor 1 and configured to obtain the target gas supply pressure difference ΔP based on the operating frequency F1 of the compressor 1.

[0059] Optionally, the air suspension bearing air supply system includes a speed detection device configured to detect the speed of compressor 1 to obtain the operating frequency F1 of compressor 1.

[0060] In this embodiment, the target air supply pressure difference ΔP can be obtained according to the operating frequency F1 of the compressor 1, and the air supply mode of the air suspension bearing can be determined according to the working state of the compressor 1, so that the air supply system can stably supply air to the air suspension bearing when the compressor 1 is in different working states.

[0061] The operating frequency F1 of compressor 1 corresponds to the minimum supply pressure difference ΔP1 required to meet the stiffness requirements of the air suspension bearing. In this embodiment, the target supply pressure difference ΔP can be calculated from the minimum supply pressure difference ΔP1: ΔP = A1 * ΔP1 + B1, where A1 and B1 are constants, and their values ​​can be determined according to the model of compressor 1. The target supply pressure difference ΔP is greater than the minimum supply pressure difference ΔP1, and the two are kept at a certain distance. This avoids the situation where the target supply pressure difference ΔP is smaller than the minimum supply pressure difference ΔP1 during the adjustment of the refrigerant pump 6 frequency.

[0062] In some embodiments, the air suspension bearing air supply system includes a throttle valve 3 and a control device. The compressor 1, condenser 2, throttle valve 3, and evaporator 4 are sequentially connected to form a refrigeration circuit C. The control device is signal-connected to the refrigerant pump 6, control valve 5, and throttle valve 3, and is configured to, when the refrigerant pump 6 is malfunctioning, cause control valve 5 to connect the inlet and outlet ends of the second refrigerant line L2, thereby de-energizing the compressor 1 and closing the throttle valve 3.

[0063] The operating status of refrigerant pump 6 can be determined in several ways. For example, a corresponding relay can be installed in the electrical circuit of refrigerant pump 6, and the signal changes of refrigerant pump 6 during operation can be checked to see if they match the signal changes of the relay. If they match, refrigerant pump 6 is operating normally; if they do not match, refrigerant pump 6 is operating abnormally. Alternatively, a refrigerant pump 6 capable of generating its own fault signal can be selected; the detection of the fault signal indicates that refrigerant pump 6 has malfunctioned.

[0064] When the refrigerant pump 6 malfunctions, the throttle valve 3 closes, stopping the refrigeration cycle. However, the compressor 1 rotor does not immediately stop rotating after power is cut off. Because the inlet and outlet of the second refrigerant line L2 are connected, the high-pressure gaseous refrigerant in the condenser 2 flows through the second refrigerant line L2 to the gas supply tank 8, and then from the gas supply tank 8 to the bearing cavity. This ensures a supply pressure differential for a period of time after the refrigerant pump 6 malfunctions and before the compressor 1 rotor stops rotating, giving the air suspension bearing sufficient rigidity to operate normally during this period and reducing the risk of compressor shaft damage.

[0065] In some embodiments, the compressor 1 has a motor cavity communicating with the bearing cavity, and the outlet of the air supply line L3 is located in the motor cavity so that the gaseous refrigerant supplied by the air supply tank 8 flows from the motor cavity into the bearing cavity.

[0066] Considering that the supply air temperature is also a direct factor affecting the stiffness of the air suspension bearing, in this embodiment, regardless of whether the condenser 2 supplies gaseous refrigerant to the supply tank 8 through the first refrigerant line L1 or the second refrigerant line L2, the gaseous refrigerant supplied by the supply tank 8 first enters the motor cavity of the compressor 1. The gaseous refrigerant first exchanges heat with the motor windings located in the motor cavity, and then enters the bearing cavity connected to the motor cavity. The gaseous refrigerant can remove the heat generated by the motor when the compressor 1 is working, which on the one hand ensures the supply air temperature of the bearing cavity, giving the air suspension bearing sufficient stiffness, and on the other hand cools the motor, ensuring the reliability of the motor during operation.

[0067] Some embodiments of this disclosure also provide a refrigeration device, including the air suspension bearing air supply system provided in the embodiments of this disclosure.

[0068] Refrigeration equipment can be, for example, a centrifugal chiller or other type of chiller.

[0069] The refrigeration equipment provided in the embodiments of this disclosure has the advantages of the air suspension bearing system provided in the embodiments of this disclosure because it adopts the air suspension bearing system provided in the embodiments of this disclosure.

[0070] In some embodiments, the control device described above may be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described herein.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and not to limit them; although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this disclosure or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this disclosure.

Claims

1. An air suspension bearing air supply system for supplying air to the air suspension bearing of the compressor (1) in a refrigeration circuit (C), characterized in that, include: A compressor (1), a condenser (2), and an evaporator (4) for forming a refrigeration circuit (C), the compressor (1) comprising a housing, a rotor, and an air suspension bearing, the housing having a bearing cavity, the rotor being supported by the air suspension bearing disposed in the bearing cavity; Gas supply tank (8); Gas supply line (L3), the gas supply tank (8) is connected to the bearing cavity through the gas supply line (L3); The exhaust pipe (L4) has its inlet end connected to the bearing cavity and its outlet end connected to the evaporator (4); The first refrigerant line (L1) has its inlet end connected to the condenser (2) and configured to draw out the liquid refrigerant from the condenser (2), and its outlet end connected to the gas supply tank (8); and The second refrigerant line (L2) has its inlet end connected to the condenser (2) and configured to draw out the gaseous refrigerant in the condenser (2), and its outlet end connected to the gas supply tank (8). The condenser (2) can selectively supply refrigerant to the gas supply tank (8) through the first refrigerant line (L1) and the second refrigerant line (L2) so that the gaseous refrigerant in the gas supply tank (8) is supplied to the bearing cavity through the gas supply line (L3).

2. The air supply system for the air suspension bearing according to claim 1, characterized in that, The first refrigerant line (L1) is equipped with a refrigerant pump (6), which is configured to deliver liquid refrigerant from the condenser (2) to the gas supply tank (8); and / or The second refrigerant line (L2) is equipped with a control valve (5), which is configured to control the connection or disconnection of the inlet and outlet ends of the second refrigerant line (L2).

3. The air supply system for the air suspension bearing according to claim 2, characterized in that, include: A condensing pressure detection device (11) is configured to detect the gas pressure P1 of the gaseous refrigerant inside the condenser (2); The gas tank pressure detection device (12) is configured to detect the gas pressure P2 inside the gas tank (8); The bearing cavity pressure detection device (13) is configured to detect the gas pressure P3 at the gas outlet of the bearing cavity; and The control device, connected to the condensing pressure detection device (11), the gas supply tank pressure detection device (12), the bearing cavity pressure detection device (13), the refrigerant pump (6), and the control valve (5), is configured to determine whether the refrigerant pump (6) is started and whether the control valve (5) connects the inlet and outlet ends of the second refrigerant pipeline (L2) based on the difference ΔP2 between the gas pressure P1 and the gas pressure P3, the difference ΔP0 between the gas pressure P2 and the gas pressure P3, and the target gas supply pressure difference ΔP.

4. The air supply system for the air suspension bearing according to claim 2, characterized in that, include: The gas tank pressure detection device (12) is configured to detect the gas pressure P2 inside the gas tank (8); The bearing cavity pressure detection device (13) is configured to detect the gas pressure P3 at the gas outlet of the bearing cavity; and The control device, together with the gas tank pressure detection device (12) and the bearing cavity pressure detection device (13), is configured to adjust the frequency of the refrigerant pump (6) according to the difference ΔP0 between the gas pressure P2 and the gas pressure P3 and the target gas supply pressure difference ΔP when the refrigerant pump (6) is started.

5. The air supply system for the air suspension bearing according to claim 4, characterized in that, The control device is signal-connected to the compressor (1) and is configured to obtain the target gas supply pressure difference ΔP based on the operating frequency F1 of the compressor (1).

6. The air supply system for the air suspension bearing according to claim 2, characterized in that, include: The compressor (1), condenser (2), throttle valve (3) and evaporator (4) are connected in sequence to form the refrigeration circuit (C); and The control device, which is signal-connected to the refrigerant pump (6), the control valve (5), and the throttle valve (3), is configured to, when the refrigerant pump (6) is in an abnormal working state, cause the control valve (5) to control the inlet and outlet of the second refrigerant pipeline (L2) to be connected, thereby de-energizing the compressor (1) and closing the throttle valve (3).

7. The air supply system for air suspension bearings according to any one of claims 1 to 6, characterized in that, The compressor (1) has a motor cavity that communicates with the bearing cavity, and the outlet of the air supply line (L3) is located in the motor cavity so that the gaseous refrigerant supplied by the air supply tank (8) flows from the motor cavity into the bearing cavity.

8. A refrigeration device, characterized in that, Includes the air supply system for the air suspension bearing according to any one of claims 1 to 7.

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