Cooling system and air conditioning unit

Abstract

The utility model provides a cooling system and an air conditioning unit, and the cooling system comprises a cooling device which is used for providing a refrigerant; the first cooling pipeline communicates with the first output port of the cooling device, a first heat exchanger is arranged on the first cooling pipeline, and the first heat exchanger is arranged in the first oil tank; and the second cooling pipeline communicates with a second output port of the cooling device, a second heat exchanger is arranged on the second cooling pipeline, and the second heat exchanger is arranged in a second oil tank communicating with the first oil tank. The cooling system solves the technical problem that a cooling system in an air conditioning unit in the prior art is poor in cooling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of cooling system technology, specifically to a cooling system and an air conditioning unit. Background Technology

[0002] In large air conditioning equipment, the temperature control of the lubricating oil in centrifugal compressors is indeed crucial to the cooling effect and stable operation of the equipment. Lubricating oil not only lubricates the compressor and ensures the normal operation of its internal components, but also plays a vital role in cooling the motor and bearings. Especially in large equipment such as centrifugal chillers and air conditioning units, the motor generates a large amount of heat during operation, and the bearings release heat when rotating at high speed. If this heat cannot be effectively dissipated, it will affect the compressor's efficiency and lifespan.

[0003] Typically, air conditioning equipment employs a specific oil circuit design to control the temperature of the lubricating oil. The lubricating oil is pumped from the oil tank, first passing through a plate heat exchanger to exchange heat with the refrigerant and lower its temperature. Then, the lubricating oil enters a high-level oil tank and is subsequently distributed to the motor interior for bearing lubrication and cooling. This design ensures that the lubricating oil operates at a suitable temperature, effectively lubricating and cooling while preventing deterioration due to excessively high temperatures, which would affect its lubricating performance.

[0004] In large-capacity high-temperature heat pump centrifugal chillers, where condensation temperatures can reach over 120 degrees Celsius, directly drawing refrigerant liquid from the condenser is insufficient to cool the lubricating oil due to its high temperature. Traditional cold oil flow paths are also inadequate for absorbing the heat released from the motor windings and bearings. Current technology involves drawing high-temperature refrigerant liquid from the condenser, pre-cooling it in a shell-and-tube heat exchanger, then throttling it before it enters a plate heat exchanger to cool the lubricating oil.

[0005] However, existing cooling systems use multi-stage heat exchangers to cool lubricating oil. The structure of multi-stage heat exchangers can easily lead to energy loss and complex control of the cooling system. This not only affects the overall cooling efficiency, but also makes it difficult to effectively reduce the temperature at the motor bearing in cooling loops that use indirect heat exchange. Furthermore, the cooling system cannot maintain stable operation under complex working conditions and high-temperature environments, which affects the service life of the entire system.

[0006] Therefore, existing technologies need further development. Utility Model Content

[0007] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide a cooling system and air conditioning unit to solve the technical problem of poor cooling efficiency of the cooling system in the air conditioning unit in the related art.

[0008] To achieve the above technical objectives, the present invention adopts the following technical solution: a cooling system and an air conditioning unit are provided, comprising: a cooling device for providing refrigerant; a first cooling pipe connected to a first output port of the cooling device, a first heat exchanger disposed on the first cooling pipe, the first heat exchanger being disposed inside a first oil tank; and a second cooling pipe connected to a second output port of the cooling device, a second heat exchanger disposed on the second cooling pipe, the second heat exchanger being disposed inside a second oil tank connected to the first oil tank.

[0009] Furthermore, the second heat exchanger includes a cooling coil connected to a second cooling pipeline, and the cooling coil is used to reduce the oil temperature in the second oil tank.

[0010] Furthermore, the cooling system includes: an oil return temperature sensor, which detects the oil return temperature of the first oil tank; and a control module, which is connected to the cooling device and the oil return temperature sensor.

[0011] Furthermore, a first switch for controlling the on / off state of the first cooling pipe is provided on the first cooling pipe. The first switch is located between the cooling device and the first oil tank, and the first switch is signal-connected to the control module.

[0012] Furthermore, a second switch for controlling the on / off state of the second cooling pipe is provided on the second cooling pipe. The second switch is located between the cooling device and the second oil tank, and the second switch is signal-connected to the control module.

[0013] Furthermore, the oil outlet of the first oil tank and the oil inlet of the second oil tank are connected through an oil supply pipeline, and a third switch is installed on the oil supply pipeline. The third switch is connected to the control module signal. The oil outlet of the second oil tank and the oil return port of the first oil tank are connected through a return oil pipeline, which flows through the area to be lubricated.

[0014] Furthermore, the cooling system includes an evaporator, and the outlets of the first cooling pipe and the second cooling pipe are both connected to the evaporator.

[0015] Furthermore, the cooling system includes a refrigerant cooling pipeline, with both ends of the refrigerant cooling pipeline connected to the evaporator. The refrigerant cooling pipeline flows through a cooling device to cool the refrigerant inside the cooling device. A fourth switch is installed on the refrigerant cooling pipeline, and the fourth switch is located between the evaporator and the cooling device.

[0016] Furthermore, the cooling system includes a refrigerant inlet pipe, one end of which is connected to the condenser, and the other end of which is connected to the refrigerant inlet of the cooling device. A fifth switch is provided on the refrigerant inlet pipe to control the on / off state of the refrigerant inlet pipe.

[0017] An air conditioning unit, comprising the aforementioned cooling system.

[0018] Beneficial effects:

[0019] 1. Through the above settings, the low-temperature refrigerant after being cooled by the cooling device is diverted to the first cooling pipe and the second cooling pipe. The heat exchanger is directly installed inside the first oil tank and the second oil tank, changing to a more direct internal cooling method. This directly cools and exchanges heat with the oil inside the first oil tank and the second oil tank, avoiding the need for multiple heat exchangers in the cooling system, avoiding energy loss caused by indirect heat exchange, simplifying the cooling system, reducing the cost of the cooling system, improving the stability of the cooling system under complex operating conditions and high-temperature environments, and solving the technical problem of poor cooling efficiency in air conditioning units in related technologies.

[0020] 2. By combining multiple pipelines and valves through the control module, multi-level regulation is achieved, thereby controlling the flow rate and refrigerant temperature in multiple refrigerant pipelines. This enables regulation of the return oil temperature of the first oil tank, achieving the goal of controlling the oil supply temperature of the oil tank, optimizing the oil supply temperature, and improving the cooling efficiency of the cooling system.

[0021] 3. In this embodiment of the air conditioning unit, the aim is to more effectively control the lubricating oil temperature and ensure stable operation of the system in high-temperature environments. By simplifying the cold oil flow path of the plate heat exchanger in the existing cooling system and replacing it with a more direct internal cooling method in the oil tank, as well as introducing intelligent multi-valve regulation control, more stable and optimized control of the lubricating oil temperature is achieved. This improved solution simplifies the cooling process, avoids energy loss and complex control caused by multi-stage heat exchangers, and improves the accuracy and stability of lubricating oil temperature control through direct cooling of the oil tank and high-level oil tank and multi-valve regulation control. It avoids the compressor motor bearing temperature rise caused by excessively high oil supply temperature, and ensures stable operation of the unit under complex operating conditions and high-temperature environments, extending the service life of the system, reducing maintenance costs, and improving the overall energy efficiency ratio and operational reliability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the cooling system used in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the cooling system to be lubricated in an embodiment of this utility model.

[0024] The above figures include the following reference numerals:

[0025] 1. Cooling device; 2. First cooling pipe; 21. First heat exchanger; 22. First switch; 3. First oil tank; 31. Oil supply pipe; 32. Third switch; 4. Second cooling pipe; 41. Second heat exchanger; 42. Second switch; 5. Second oil tank; 51. Lubrication point; 6. Oil return temperature sensor; 7. Evaporator; 8. Refrigerant cooling pipe; 81. Fourth switch; 9. Refrigerant input pipe; 91. Fifth switch; 92. Condenser. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0027] Example 1

[0028] According to an embodiment of this utility model, a cooling system and an air conditioning unit are provided. Please refer to [link / reference]. Figures 1 to 2 ,include:

[0029] Cooling device 1, cooling device 1 is used to provide refrigerant;

[0030] The first cooling pipe 2 is connected to the first output port of the cooling device 1. The first cooling pipe 2 is equipped with a first heat exchanger 21, which is located inside the first oil tank 3.

[0031] The second cooling pipe 4 is connected to the second output port of the cooling device 1. The second cooling pipe 4 is equipped with a second heat exchanger 41, which is located inside the second oil tank 5, which is connected to the first oil tank 3.

[0032] Through the above configuration, the low-temperature refrigerant cooled by the cooling device 1 is diverted to the first cooling pipe 2 and the second cooling pipe 4. The heat exchangers are directly installed inside the first oil tank 3 and the second oil tank 5, changing to a more direct internal cooling method. The oil inside the first oil tank 3 and the second oil tank 5 is directly cooled and heat exchanged, avoiding the need for multiple heat exchangers in the cooling system, avoiding energy loss caused by indirect heat exchange, simplifying the cooling system, reducing the cost of the cooling system, improving the stability of the cooling system under complex operating conditions and high-temperature environments, and solving the technical problem of poor cooling efficiency in air conditioning units in related technologies.

[0033] In the cooling system of this embodiment, see Figure 2The second heat exchanger 41 includes a cooling coil, which is connected to the second cooling pipe 4. The cooling coil is used to reduce the temperature of the oil in the second oil tank 5.

[0034] In some embodiments, the first heat exchanger 21 is also a cooling coil.

[0035] Specifically, by installing cooling coils, the contact area between the second heat exchanger 41 and the oil is increased, thereby further reducing the oil temperature in the second oil tank 5.

[0036] It should be noted that when the cooling system in this embodiment is applied to the heating flow path of the air conditioning unit, the second oil tank 5 is a high-level oil tank used to provide lubricating oil to lubricate the compressor bearing. The cooling system in this embodiment eliminates the traditional plate heat exchanger and instead inserts a cooling oil coil inside the first oil tank 3 and the second oil tank 5. This allows the high-temperature refrigerant drawn from the condenser to directly enter the first oil tank 3 and the second oil tank 5 after being pre-cooled by the cooling device 1. It then exchanges heat with the lubricating oil through the cooling coil, thereby directly and effectively reducing the temperature of the lubricating oil and cooling the bearing and the compressor.

[0037] It should be noted that the cooling system also includes a refrigerant flow path for the refrigeration motor that is also connected to the cooling device 1. In this embodiment, the cooling system directly adds a second cooling pipe 4 to the original refrigerant flow path of the refrigeration motor, without the need to draw a new flow path from the condenser 92, which saves costs and simplifies the flow path. The second cooling pipe 4 and the cooling coil directly cool the oil entering the bearing, preventing high temperature from causing bearing wear and unit failure.

[0038] In the cooling system of this embodiment, see Figure 1 The cooling system includes:

[0039] Return oil temperature sensor 6, the return oil temperature sensor 6 detects the return oil temperature of the first oil tank 3;

[0040] The control module is connected to the cooling device 1 and the return oil temperature sensor 6.

[0041] With the above settings, by detecting the return oil temperature of the first oil tank 3, the oil temperature of the return oil in the first oil tank 3 can be obtained, thereby obtaining the current operating condition of the cooling system, and adjusting the cooling efficiency of the cooling device 1 and controlling the flow rate of the refrigerant entering the first cooling pipe 2 and the second cooling pipe 4 according to different operating conditions.

[0042] In the cooling system of this embodiment, see Figure 1A first switch 22 is provided on the first cooling pipe 2 to control the on / off state of the first cooling pipe 2. The first switch 22 is located between the cooling device 1 and the first oil tank 3, and the first switch 22 is connected to the control module via a signal. By setting the first switch 22, the flow rate in the first cooling pipe 2 can be adjusted, thereby adjusting the heat exchange intensity of the first heat exchanger 21.

[0043] In the cooling system of this embodiment, see Figure 2 A second switch 42 is installed on the second cooling pipe 4 to control the on / off state of the second cooling pipe 4. The second switch 42 is located between the cooling device 1 and the second oil tank 5, and the second switch 42 is connected to the control module via a signal. By setting the second switch 42, the flow rate in the second cooling pipe 4 can be adjusted, thereby adjusting the heat exchange intensity of the second heat exchanger 41.

[0044] In the cooling system of this embodiment, see Figure 1 The oil outlet of the first oil tank 3 and the oil inlet of the second oil tank 5 are connected through the oil supply pipeline 31. A third switch 32 is installed on the oil supply pipeline 31, and the third switch 32 is connected to the control module signal.

[0045] The oil outlet of the second oil tank 5 and the oil return port of the first oil tank 3 are connected by a return oil pipeline, which flows through the lubrication point 51.

[0046] Specifically, the oil pump supplies oil, and the lubricating oil in the first oil tank 3 enters the second oil tank 5 after passing through the oil pump and filter. After lubricating the bearing, it returns to the first oil tank 3 and is cooled by the cold oil coil in the first oil tank 3. The third switch 32 controls the flow rate of the lubricating oil entering the second oil tank 5.

[0047] Preferably, the part to be lubricated 51 is a bearing in the compressor, and the oil is preferably lubricating oil, which lubricates and cools the bearing.

[0048] Specifically, by setting the third switch 32, the flow rate of oil entering the second oil tank 5 can be controlled, thereby adjusting the cooling and lubrication effects of the part to be lubricated 51.

[0049] In the cooling system of this embodiment, see Figure 1 The cooling system includes an evaporator 7, and the output ports of the first cooling pipe 2 and the second cooling pipe 4 are both connected to the evaporator 7.

[0050] With the above setup, the refrigerant in the first cooling pipe 2 and the second cooling pipe 4 returns to the evaporator 7 to participate in the refrigeration cycle after cooling is completed.

[0051] In the cooling system of this embodiment, see Figure 1The cooling system includes a refrigerant cooling pipe 8, with both ends of the refrigerant cooling pipe 8 connected to the evaporator 7. The refrigerant cooling pipe 8 flows through the cooling device 1 to cool the refrigerant in the cooling device 1. A fourth switch 81 is installed on the refrigerant cooling pipe 8, and the fourth switch 81 is located between the evaporator 7 and the cooling device 1.

[0052] With the above settings, by drawing a refrigerant from the evaporator 7 as the cold source for the cooling device 1, the temperature of the refrigerant in the cooling device 1 is reduced, thereby further improving the cooling efficiency of the cooling system. By setting the fourth switch 81, the opening degree of the refrigerant cooling pipe 8 can be controlled, thereby achieving the effect of adjusting the cooling efficiency of the cooling device 1. When the opening degree of the refrigerant cooling pipe 8 increases, the cooling efficiency of the cooling device 1 increases; when the opening degree of the refrigerant cooling pipe 8 decreases, the cooling efficiency of the cooling device 1 decreases.

[0053] Preferably, the cooling device 1 is a shell-and-tube oil cooler. Low-temperature refrigerant is drawn from the evaporator 7 and enters the shell side of the shell-and-tube oil cooler. The refrigerant in the refrigerant cooling pipe 8 returns to the evaporator 7 after passing through the shell-and-tube oil cooler.

[0054] In the cooling system of this embodiment, see Figure 1 The cooling system includes a refrigerant inlet pipe 9, one end of which is connected to the condenser 92, and the other end of which is connected to the refrigerant inlet of the cooling device 1. A fifth switch 91 is provided on the refrigerant inlet pipe 9 to control the on / off state of the refrigerant inlet pipe 9.

[0055] By setting up a refrigerant input pipe 9, the refrigerant in the condenser 92 is led out to the cooling device 1 for pre-cooling. After pre-cooling, the refrigerant enters the first cooling pipe 2 and the second cooling pipe 4 respectively. The flow rate of the low-temperature refrigerant entering the refrigerant input pipe 9 can be adjusted by the fifth switch 91, which is the total flow rate of the refrigerant entering the cooling system.

[0056] It is understood that the switches in this embodiment can be any type of valve body, such as ball valve, gate valve, solenoid valve, angle valve, etc.

[0057] Understandably, by using a control module to combine multiple pipelines and valves to achieve multi-level regulation, the flow rate and temperature of the refrigerant in multiple refrigerant pipelines are controlled, thereby regulating the return oil temperature of the first oil tank 3, achieving the goal of controlling the oil supply temperature of the oil tank, optimizing the oil supply temperature, and improving the cooling efficiency of the cooling system.

[0058] The cooling system in this embodiment operates as follows: After the unit is started, the oil pump is turned on first, and the oil supply line 31 operates. After the oil pump continuously supplies oil for a period of time, the refrigerant pump is turned on, and the cooling flow path operates. Subsequently, the unit starts up, and the temperature of the compressor bearing windings rises. However, since the cooling flow path and oil supply line 31 are already operating stably, the bearing and winding temperatures will remain within a stable range. Let the return oil temperature be T1, and the normal range be t2>T1≥t1. During normal operation of the unit, the fifth switch 91, the fourth switch 81, the second switch 42, and the first switch 22 are normally open. When the return oil temperature T1 ≥ t2, the first switch 22 opens wider to reduce the internal temperature of the first oil tank 3, the second switch 42 opens wider to increase the flow rate of refrigerant entering the second oil tank 5, the fifth switch 91 opens wider to increase the total flow rate of cooling refrigerant, and the fourth switch 81 opens wider to reduce the temperature of the cold oil and refrigerant, thus lowering the supply oil temperature. When the return oil temperature T1 < t1, the first switch 22 closes slightly to reduce the flow rate of cold oil, the second switch 42 closes slightly to reduce the flow rate of refrigerant entering the second oil tank 5, the fifth switch 91 closes slightly to reduce the total flow rate of cold oil and refrigerant, and the fourth switch 81 closes slightly to increase the temperature of the cold oil and refrigerant, thus increasing the supply oil temperature. When the return oil temperature T1 returns to the normal range, all valves remain open. The priority of the above actions is: first switch 22 > second switch 42 > fifth switch 91 > fourth switch 81. Each action does not run simultaneously; the interval time is set according to the specific example test.

[0059] Example 2

[0060] In this embodiment, the air conditioning unit includes the cooling system described above.

[0061] In the air conditioning unit of this embodiment, the low-temperature refrigerant after being cooled by the cooling device 1 is diverted to the first cooling pipe 2 and the second cooling pipe 4. The heat exchanger is directly installed inside the first oil tank 3 and the second oil tank 5 to directly cool and exchange heat with the oil inside the first oil tank 3 and the second oil tank 5. This avoids the need to install multiple heat exchangers in the cooling system, avoids energy loss caused by indirect heat exchange, simplifies the cooling system, reduces the cost of the cooling system, improves the stability of the cooling system under complex operating conditions and high-temperature environments, and solves the technical problem of poor cooling efficiency in air conditioning units in related technologies.

[0062] In this embodiment of the air conditioning unit, the traditional plate heat exchanger is eliminated, and instead, a cooling coil is inserted inside the first oil tank 3. This allows the high-temperature refrigerant drawn from the condenser 92 to enter the first oil tank 3 directly after pre-cooling by the shell-and-tube heat exchanger, and exchange heat with the lubricating oil through the cooling coil, thereby directly and effectively reducing the temperature of the lubricating oil.

[0063] In the air conditioning unit of this embodiment, the cooling coil in the second oil tank 5 directly cools the oil entering the bearing, preventing high temperature from causing bearing wear and unit failure. In addition, it directly increases the flow of refrigerant from the original refrigeration motor, eliminating the need to draw a new flow path from the condenser 92, thus saving costs.

[0064] In the air conditioning unit of this embodiment, a multi-valve regulation control system is incorporated to more precisely control the lubricating oil temperature. The fifth switch 91 controls the refrigerant flow rate in the refrigerant input pipe 9; the fourth switch 81 controls the flow rate of the low-temperature refrigerant entering the cooling device 1 through the refrigerant cooling pipe 8, thereby controlling the refrigerant temperature in the refrigerant input pipe 9; the first switch 22 controls the refrigerant flow rate in the first cooling pipe 2, thereby directly controlling the temperature inside the first oil tank 3; the third switch 32 controls the flow rate of lubricating oil entering the high-level oil tank through the oil supply pipe 31; and the second switch 42 controls the flow rate of refrigerant entering the second oil tank 5 through the second cooling pipe 4, thereby directly controlling the temperature in the second oil tank 5. By adjusting the refrigerant and oil flow rates in these multiple flow paths, the lubricating oil temperature is ensured to be within the optimal range, responding in real-time to oil temperature changes and load requirements, thus ensuring the stability of the lubricating oil temperature.

[0065] In this embodiment of the air conditioning unit, the aim is to more effectively control the lubricating oil temperature and ensure stable operation of the system in high-temperature environments. By simplifying the cold oil flow path of the plate heat exchanger in the existing cooling system and replacing it with a more direct internal cooling method in the oil tank, as well as introducing intelligent multi-valve regulation control, more stable and optimized control of the lubricating oil temperature is achieved. This improved solution simplifies the cooling process, avoids energy loss and complex control caused by multi-stage heat exchangers, and improves the accuracy and stability of lubricating oil temperature control through direct cooling of the oil tank and high-level oil tank and multi-valve regulation control. This prevents the compressor motor bearing temperature from rising due to excessively high oil supply temperature, and ensures stable operation of the unit under complex operating conditions and high-temperature environments, extending the service life of the system, reducing maintenance costs, and improving the overall energy efficiency ratio and operational reliability.

[0066] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0067] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0068] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0069] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0070] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A cooling system, characterized in that, include: Cooling device (1), the cooling device (1) is used to provide refrigerant; The first cooling pipe (2) is connected to the first output port of the cooling device (1). The first cooling pipe (2) is provided with a first heat exchanger (21), which is located inside the first oil tank (3). The second cooling pipe (4) is connected to the second output port of the cooling device (1). The second cooling pipe (4) is provided with a second heat exchanger (41), which is located inside the second oil tank (5) connected to the first oil tank (3).

2. The cooling system according to claim 1, characterized in that, The second heat exchanger (41) includes a cooling coil connected to the second cooling pipeline (4), and the cooling coil is used to reduce the oil temperature in the second oil tank (5).

3. The cooling system according to claim 1, characterized in that, The cooling system includes: Return oil temperature sensor (6), the return oil temperature sensor (6) detects the return oil temperature of the first oil tank (3); The control module is connected to the cooling device (1) and the return oil temperature sensor (6).

4. The cooling system according to claim 3, characterized in that, The first cooling pipe (2) is provided with a first switch (22) for controlling the opening and closing of the first cooling pipe (2). The first switch (22) is located between the cooling device (1) and the first oil tank (3). The first switch (22) is signal connected to the control module.

5. The cooling system according to claim 3, characterized in that, A second switch (42) for controlling the on / off state of the second cooling pipe (4) is provided on the second cooling pipe (4). The second switch (42) is located between the cooling device (1) and the second oil tank (5). The second switch (42) is signal-connected to the control module.

6. The cooling system according to claim 3, characterized in that, The oil outlet of the first oil tank (3) and the oil inlet of the second oil tank (5) are connected through an oil supply pipeline (31). A third switch (32) is provided on the oil supply pipeline (31), and the third switch (32) is signal-connected to the control module. The oil outlet of the second oil tank (5) and the oil return port of the first oil tank (3) are connected by a return oil pipeline, which flows through the lubrication point (51).

7. The cooling system according to claim 1, characterized in that, The cooling system includes an evaporator (7), and the output ports of the first cooling pipe (2) and the second cooling pipe (4) are both connected to the evaporator (7).

8. The cooling system according to claim 7, characterized in that, The cooling system includes a refrigerant cooling pipe (8), the two ends of which are connected to the evaporator (7). The refrigerant cooling pipe (8) flows through the cooling device (1) to cool the refrigerant in the cooling device (1). A fourth switch (81) is provided on the refrigerant cooling pipe (8), and the fourth switch (81) is located between the evaporator (7) and the cooling device (1).

9. The cooling system according to claim 1, characterized in that, The cooling system includes a refrigerant inlet pipe (9), one end of which is connected to the condenser (92), and the other end of which is connected to the refrigerant inlet of the cooling device (1). A fifth switch (91) is provided on the refrigerant inlet pipe (9) for controlling the on / off state of the refrigerant inlet pipe (9).

10. An air conditioning unit, characterized in that, The air conditioning unit includes the cooling system as described in any one of claims 1 to 9.

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