Lubricating oil cooling recovery system, air conditioning equipment and control method

Abstract

The invention discloses a lubricating oil cooling and recycling system, air conditioning equipment and a control method. The lubricating oil cooling recovery system is applied to the air conditioning equipment, the air conditioning equipment comprises a compressor, and the compressor comprises an exhaust port, an air return port, an oil discharge port and an oil return port; the lubricating oil cooling recovery system comprises an oil return pipeline and a cooling device. Two ends of the oil return pipeline are respectively connected with the oil discharge port and the oil return port. The cooling device comprises an input port and a first output port, the input port is connected with a first connector of the air return pipeline, the first output port is connected with a second connector of the air return pipeline, and the air return pipeline is connected with the air return port. At least part of the oil return pipeline is located in the cooling device. And the cooling device can cool the lubricating oil in the oil return pipeline. In this way, it can be ensured that the temperature of the lubricating oil entering the oil return opening is not high, and therefore it is ensured that the lubricating effect of the lubricating oil on the compressor is good.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning equipment, and more specifically, to a lubricating oil cooling recovery system, air conditioning equipment and a control method. Background Art

[0002] In order to improve the efficiency and safety of the compressor, air conditioning equipment often uses lubricating oil to assist the compressor in operation. The temperature of the lubricating oil will have a relatively large impact on the properties of the lubricating oil, such as viscosity, which will affect the lubricating effect of the lubricating oil. Therefore, how to effectively cool the lubricating oil has become an urgent problem to be solved. Summary of the invention

[0003] Embodiments of the present application provide a lubricating oil cooling and recovery system, air conditioning equipment, and a control method.

[0004] The lubricating oil cooling and recovery system of the embodiment of the present application is applied to air conditioning equipment, the air conditioning equipment includes a compressor, the compressor includes an exhaust port, an air return port, an oil drain port and an oil return port; the lubricating oil cooling and recovery system includes an oil return pipeline and a cooling device. The two ends of the oil return pipeline are respectively connected to the oil drain port and the oil return port. The cooling device includes an input port and a first output port, the input port is connected to a first interface of the air return pipeline, the first output port is connected to a second interface of the air return pipeline, and the air return pipeline is connected to the air return port; at least a portion of the oil return pipeline is located in the cooling device.

[0005] In some embodiments, the air conditioning equipment also includes an evaporator and a condenser, the compressor, the evaporator and the condenser are connected in pairs, the return air pipeline includes at least a first pipeline between the return air port and the exhaust port of the evaporator, and the second interface is located in the first pipeline.

[0006] In certain embodiments, the return air pipeline includes a first pipeline between the return air port and the evaporator, and a second pipeline between the evaporator and the condenser, and the first interface is located in the second pipeline.

[0007] In certain embodiments, the lubricating oil cooling recovery system also includes a first ejector, a first input port of the first ejector is connected to the first interface, a second input port of the first ejector is connected to an exhaust pipeline, the exhaust pipeline is connected to the exhaust port of the compressor, and an output port of the first ejector is connected to an input port of the cooling device.

[0008] In certain embodiments, the lubricating oil cooling and recovery system further includes an electric regulating valve, and the electric regulating valve is connected to an input port of the cooling device.

[0009] In certain embodiments, the lubricating oil cooling and recovery system further includes a temperature sensor, and the temperature sensor is disposed in an oil return pipe connected to the oil return port of the compressor.

[0010] In certain embodiments, the cooling device further includes a first filter and a shell, the return oil pipeline at least partially extends into the shell, the first filter is located inside the shell, and the first filter is arranged near the first output port of the cooling device.

[0011] In certain embodiments, the lubricating oil cooling and recovery system also includes an oil tank, the oil tank includes a second filter, an oil pump and a casing, the casing is provided with a first input port of the oil tank, a first output port of the oil tank and a second output port of the oil tank; the oil tank is installed in the oil return pipeline, and the first input port of the oil tank is connected to the oil discharge port of the compressor, the first output port of the oil tank is connected to the return air port of the compressor, the second output port of the oil tank corresponds to the cooling device, the second filter and the oil pump are installed inside the casing, the second filter is arranged near the first output port of the oil tank, and the oil pump is arranged near the second output port of the oil tank.

[0012] In certain embodiments, the lubricating oil cooling and recovery system further comprises a second ejector, a first input port of the second ejector being connected to an exhaust pipeline, the exhaust pipeline being connected to an exhaust port of the compressor, a second input port of the second ejector being connected to a second output port of the cooling device, the second output port of the cooling device being located at the bottom of the cooling device, and an output port of the second ejector being connected to a second input port of the oil tank.

[0013] In certain embodiments, the lubricating oil cooling and recovery system further includes a solenoid valve installed between an output port of the second ejector and a second input port of the oil tank.

[0014] In certain embodiments, the cooling device further includes an oil level indicator and a housing, wherein the oil level indicator is located inside the housing and mounted on the bottom of the housing.

[0015] In certain embodiments, the cooling device includes a shell, and the oil return pipeline includes a heat exchange pipeline, a first connecting pipeline and a second connecting pipeline, the first connecting pipeline connects the input port of the heat exchange pipeline with the oil return port of the compressor, the second connecting pipeline connects the output port of the heat exchange pipeline with the oil discharge port of the compressor, the heat exchange pipeline is arranged inside the shell of the cooling device, and the heat exchange pipeline is spiral.

[0016] The air conditioning device of the embodiment of the present application comprises a compressor and a lubricating oil cooling and recovery system as described in any one of the above embodiments. The compressor comprises an exhaust port, an air return port, an oil discharge port and an oil return port.

[0017] The control method of the embodiment of the present application is applied to a lubricating oil cooling and recovery system, the control method is used for a lubricating oil cooling and recovery system, the lubricating oil cooling and recovery system is applied to an air-conditioning device, the air-conditioning device includes a compressor, the compressor includes an exhaust port, an air return port, an oil drain port and an oil return port; the lubricating oil cooling and recovery system includes an oil return pipeline, a cooling device and an electric regulating valve; the two ends of the oil return pipeline are respectively connected to the oil drain port and the oil return port; the cooling device includes an input port and a first output port, the input port is connected to a first interface of the air return pipeline, the first output port is connected to a second interface of the air return pipeline, and the air return pipeline is connected to the air return port; at least a portion of the oil return pipeline is located in the cooling device, the electric regulating valve is connected to the input port of the cooling device, and the electric regulating valve is connected to the input port of the cooling device, and the control method also includes: controlling the opening of the electric regulating valve according to the current oil temperature corresponding to the air return port.

[0018] In certain embodiments, the lubricating oil cooling and recovery system further includes a temperature sensor, and the temperature sensor is disposed in an oil return pipe connected to the oil return port of the compressor. The control method further includes: determining the current oil temperature based on a detection result of the temperature sensor.

[0019] In certain embodiments, the lubricating oil cooling and recovery system also includes an oil tank, a second ejector and a solenoid valve, the oil tank includes a second filter and an oil pump, the oil tank is installed on the return oil pipeline, and the first input port of the oil tank is connected to the oil discharge port of the compressor, the first output port of the oil tank is connected to the return air port of the compressor, the second output port of the oil tank corresponds to the cooling device, the first input port of the second ejector is connected to the exhaust pipeline, the exhaust pipeline is connected to the exhaust port of the compressor, the second input port of the second ejector is connected to the second output port of the cooling device, the second output port of the cooling device is located at the bottom of the cooling device, the output port of the second ejector is connected to the second input port of the oil tank, the solenoid valve is installed between the output port of the second ejector and the second input port of the oil tank, and the control method also includes: when the current oil level of the cooling device is greater than the preset oil level threshold, controlling the solenoid valve to open.

[0020] In some embodiments, the cooling device also includes an oil level indicator and a shell, the oil level indicator is located inside the shell and installed at the bottom of the shell, and the control method also includes: determining whether the current oil level of the cooling device is greater than a preset oil level threshold based on the detection result of the oil level indicator.

[0021] In some embodiments, determining the current oil level of the cooling device based on the detection result of the oil level indicator includes: after determining that the air-conditioning equipment is started and has run for a preset time, determining whether the current oil level of the cooling device is greater than a preset oil level threshold based on the detection result of the oil level indicator.

[0022] The lubricating oil cooling and recovery system, air conditioning equipment and control method of the embodiment of the present application, the lubricating oil cooling and recovery system includes a return oil pipeline and a cooling device, the high-temperature lubricating oil of the compressor of the air conditioning equipment can enter the cooling device through the return oil pipeline, and the input port of the cooling device is connected to the first interface of the return air pipeline. The cooling device can cool the lubricating oil in the return oil pipeline. The return air pipeline is connected to the return air port, for example, the return air pipeline may include a first pipeline directly connected to the return air port, and a low-temperature and low-pressure gaseous refrigerant flows in the first pipeline, and the first interface is connected to the first pipeline, so that the refrigerant in the return air pipeline can enter the cooling device through the first interface and cool the high-temperature lubricating oil entering the cooling device. For another example, the return air pipeline includes a second pipeline indirectly connected to the return air port through an evaporator, and the first interface is connected to the second pipeline. Liquid refrigerant flows in the second pipeline. The liquid refrigerant can be vaporized in the cooling device and absorb the heat of the high-temperature lubricating oil entering the cooling device to complete the cooling of the lubricating oil. In this way, under the joint action of the oil return pipeline, the air return pipeline and the cooling device, the lubricating oil can be effectively cooled to ensure that the temperature of the lubricating oil entering the oil return port is not high, thereby ensuring that the lubricating oil has a better lubricating effect on the compressor.

[0023] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is a schematic diagram of the structure of an air conditioning device according to some embodiments of the present application;

[0026] Figure 2 It is a structural schematic diagram of air conditioning equipment in other embodiments of the present application;

[0027] Figure 3is a schematic flow diagram of a lubricating oil cooling and recovery system according to certain embodiments of the present application;

[0028] Figure 4 is a schematic flow diagram of a lubricating oil cooling and recovery system according to certain embodiments of the present application;

[0029] Figure 5 is a schematic flow diagram of a lubricating oil cooling and recovery system according to certain embodiments of the present application;

[0030] Figure 6 It is a schematic flow diagram of a lubricating oil cooling and recovery system according to certain embodiments of the present application.

[0031] 1000, air conditioning equipment; 200, compressor; 300, evaporator; 400, condenser; 500, throttle valve;

[0032] 100. Lubricating oil cooling and recovery system;

[0033] 10. Oil return pipeline; 11. Heat exchange pipeline; 20. Cooling device; 21. Shell; 22. First filter; 23. Oil level indicator; 30. Air return pipeline; 31. First pipeline; 32. Second pipeline; 40. First ejector; 50. Oil tank; 51. Second filter; 52. Oil pump; 53. Shell; 60. Electric regulating valve; 70. Temperature sensor; 80. Second ejector; 90. Exhaust pipeline; 110. Solenoid valve;

[0034] Y1, exhaust port; Y2, air return port; Y3, oil drain port; Y4, oil return port; X1, first interface; X2, second interface. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as limiting the embodiments of the present application.

[0036] In order to improve the efficiency and safety of the compressor, air conditioning equipment often uses lubricating oil to assist the compressor in operation. The temperature of the lubricating oil has a relatively large impact on the properties of the lubricating oil, such as viscosity. The temperature of the lubricating oil discharged from the compressor is usually high, so how to reduce the temperature of the lubricating oil discharged from the compressor has become an urgent problem to be solved.

[0037] Existing cooling technologies include refrigerant cooling, that is, the supercooled liquid at the bottom of the condenser and the lubricating oil heated by lubricating the cooling bearing are exchanged through a heat exchanger (such as a plate heat exchanger), thereby realizing the cooling and temperature control of the lubricating oil. In the process of cooling the lubricating oil, the liquid refrigerant is heated to gas and then flows into the evaporator, compressed by the compressor, and then discharged into the condenser to be cooled into liquid, and this cycle repeats. This cooling system needs to be equipped with an efficient plate heat exchanger and an electronic expansion valve, which is costly. When the system operates under partial load or small pressure difference conditions, the lubricating oil is easily insufficiently cooled due to the decrease in system pressure difference and insufficient driving force. In addition, the gaseous refrigerant generated in the process of cooling the lubricating oil enters the evaporator, is sucked in by the compressor, compressed and discharged to the condenser, and the compressor needs to consume additional power when compressing this part of the gaseous refrigerant, which reduces the system efficiency. Another way to cool the lubricating oil is to use cooling water for cooling, which is called "water cooling". Water cooling has low heat exchange efficiency and requires additional power (such as a water pump), which reduces the system efficiency. In addition, water-cooled heat exchangers are prone to scaling and clogging, have low reliability and high maintenance costs.

[0038] In order to solve the above problems, the embodiment of the present application provides a lubricating oil cooling and recovery system. The lubricating oil cooling and recovery system of the present application will be described in detail below:

[0039] See also Figure 1 The embodiment of the present application provides a lubricating oil cooling and recovery system 100, and the lubricating oil cooling and recovery system 100 is applied to an air conditioning device 1000, and the air conditioning device 1000 includes a compressor 200, and the compressor 200 includes an exhaust port Y1, a return port Y2, an oil drain port Y3 and an oil return port Y4. The lubricating oil cooling and recovery system 100 includes an oil return pipeline 10 and a cooling device 20. The two ends of the oil return pipeline 10 are respectively connected to the oil drain port Y3 and the oil return port Y4. The cooling device 20 includes an input port and a first output port, the input port is connected to the first interface X1 of the return air pipeline 30, the first output port is connected to the second interface X2 of the return air pipeline 30, and the return air pipeline 30 is connected to the return air port Y2; at least a part of the return oil pipeline 10 is located in the cooling device 20.

[0040] Specifically, the compressor 200 is a core component of the air conditioning device 1000, and is mainly responsible for compressing and transmitting refrigerant vapor. It releases the energy in the refrigerant in the form of heat by changing the state of the refrigerant (from gaseous to liquid), thereby achieving a cooling effect. Lubricating oil can play a lubricating role in the compressor 200. Lubrication in the compressor 200 can not only reduce the friction and wear of the machine, but also play a role in sealing, cooling and reducing operating noise. Good lubrication conditions are an important guarantee for the long-term and reliable operation of the compressor 200.

[0041] The air conditioning device 1000 also includes an evaporator 300 and a condenser 400. The main function of the evaporator 300 is to absorb the heat in the system from the liquid refrigerant and convert it into steam, thereby generating a refrigeration effect. The function of the condenser 400 is to dissipate the heat and cool down the high-temperature and high-pressure refrigerant steam discharged from the compressor 200, so that it condenses into liquid high-pressure refrigerant.

[0042] The compressor 200, the evaporator 300 and the condenser 400 are connected in pairs, that is, the exhaust port Y1 of the compressor 200 is connected to the air intake port of the condenser 400, the exhaust port Y1 of the condenser 400 is connected to the air intake port of the evaporator 300, and the exhaust port Y1 of the evaporator 300 is connected to the air return port Y2 of the compressor 200. The refrigerant is sucked in and compressed in the compressor 200, and is transformed into a high-temperature and high-pressure gas state. Subsequently, the refrigerant enters the condenser 400, where the refrigerant maintains a certain pressure and temperature and gradually condenses from a gas state to a liquid state. After the condensation is completed, the refrigerant exists in a high-temperature and high-pressure liquid state. Next, the refrigerant flows through the evaporator 300, absorbs heat and vaporizes in the evaporator 300, and is transformed from a high-temperature and high-pressure liquid state to a low-temperature and low-pressure gas state. The final stage is evaporation, where the refrigerant absorbs heat and vaporizes in the evaporator 300, and becomes a low-temperature and low-pressure gas state, and is then sucked in by the compressor 200 again for a new round of compression. In particular, a throttle valve 500 may be provided between the evaporator 300 and the condenser 400. The throttle valve 500 may be used to reduce the pressure of the liquid refrigerant so that the refrigerant flowing to the air intake of the evaporator 300 is a high-temperature, low-pressure liquid.

[0043] The return air pipeline 30 is connected to the return air port Y2, so the return air pipeline 30 at least includes a first pipeline 31 directly connected to the return air port Y2, that is, the first pipeline 31 between the return air port Y2 and the exhaust port Y1 of the evaporator 300. Alternatively, the return air pipeline 30 may also include a pipeline indirectly connected to the return air port Y2, that is, a second pipeline 32 between the evaporator 300 and the condenser 400. In the case where the return air pipeline 30 only includes the first pipeline 31, the first interface X1 is located in the first pipeline 31. In the case where the return air pipeline 30 includes the first pipeline 31 and the second pipeline 32, the first interface X1 may be located in at least one of the first pipeline 31 and the second pipeline 32. The second interface X2 is located in the first pipeline 31. It can be understood that the first pipeline 31 flows with a low-temperature and low-pressure gaseous refrigerant, and the second pipeline 32 flows with a liquid refrigerant.

[0044] The two ends of the return oil pipeline 10 are respectively connected to the oil discharge port Y3 and the oil return port Y4. The lubricating oil discharged from the compressor 200 enters the return oil pipeline 10 through the oil discharge port Y3. After moving in the return oil pipeline 10, it can return to the compressor 200 through the oil return port Y4 to circulate again.

[0045] The cooling device 20 includes a shell 21 and an input port and a first output port penetrating the shell 21. The input port of the cooling device 20 is connected to the first interface X1 of the return air pipeline 30, and the first output port of the cooling device 20 is connected to the second interface X2 of the return air pipeline 30. At least part of the return oil pipeline 10 is located in the cooling device 20. For example, the return oil pipeline 10 may include a heat exchange pipeline 11, a first connecting pipeline and a second connecting pipeline. The first connecting pipeline connects the output port of the heat exchange pipeline 11 and the return oil port Y4 of the compressor 200, and the second connecting pipeline connects the input port of the heat exchange pipeline 11 and the oil discharge port Y3 of the compressor 200. The heat exchange pipeline 11 is installed inside the shell 21 of the cooling device 20.

[0046] The shape of the heat exchange pipeline 11 can be various. In some embodiments, the heat exchange pipeline 11 is spiral to increase the heat exchange area of ​​the heat exchange pipeline 11, so as to improve the heat exchange efficiency. In some embodiments, the heat exchange pipeline 11 is linear to reduce the length of the heat exchange pipeline 11, so as to reduce the manufacturing cost of the heat exchange pipeline 11. The heat exchange pipeline 11 can be one or more, for example, one, four or six. In the case of one heat exchange pipeline 11, the input port of the heat exchange pipeline 11 is connected to the second connecting pipeline, and the output port of the heat exchange pipeline 11 is connected to the first connecting pipeline, so as to reduce the manufacturing cost of the heat exchange pipeline 11 while ensuring the heat exchange efficiency. In the case of multiple heat exchange pipelines 11, the input port of each heat exchange pipeline 11 is connected to the second connecting pipeline, and the output port of each heat exchange pipeline 11 is connected to the first connecting pipeline, so as to use multiple heat exchange pipelines 11 for heat exchange, so as to improve the heat exchange efficiency.

[0047] Please combine Figure 2 When the first interface X1 is located in the first pipeline 31, the low-temperature and low-pressure gaseous refrigerant in the first pipeline 31 can enter the accommodating space inside the cooling device 20 and contact the heat exchange pipeline 11, so that the low-temperature and low-pressure gaseous refrigerant can exchange heat with the high-temperature lubricating oil in the heat exchange pipeline 11 to reduce the temperature of the lubricating oil. The cooled lubricating oil can return to the compressor 200 through the oil return port Y4.

[0048] Please combine Figure 1, when the first interface X1 is located in the second pipeline 32, the liquid refrigerant in the second pipeline 32 can enter the accommodation space inside the cooling device 20. The first output port of the cooling device 20 is connected to the second interface X2 of the return air pipeline 30, that is, the first output port of the cooling device 20 is connected to the return air port Y2, so that a low pressure is formed inside the cooling device 20, so that the liquid refrigerant is vaporized into gas in the cooling device 20 in a low-pressure and high-temperature environment, and absorbs the heat of the high-temperature lubricating oil in the heat exchange pipeline 11. The refrigerant after heat exchange enters the return air pipeline 30 through the first output port of the cooling device 20, and re-enters the compressor 200 through the return air port Y2. The lubricating oil after cooling can return to the compressor 200 through the oil return port Y4. Of course, the input port of the cooling device 20 can be connected to the evaporator 300, the second pipeline 32 is connected to the evaporator 300, the first interface X1 is indirectly connected to the return air pipeline 30, and the liquid refrigerant in the second pipeline 32 is transported to the evaporator 300. The evaporator 300 actually stores liquid refrigerant inside during heat exchange. At this time, the liquid refrigerant in the evaporator 300 can be transported to the cooling device 20 to facilitate the subsequent cooling of the lubricating oil in the heat exchange pipeline 11.

[0049] The lubricating oil cooling and recovery system 100 of the embodiment of the present application includes an oil return pipeline 10 and a cooling device 20. The high-temperature lubricating oil of the compressor 200 of the air-conditioning equipment 1000 can enter the cooling device 20 through the oil return pipeline 10. The input port of the cooling device 20 is connected to the first interface X1 of the return air pipeline 30. The cooling device 20 can cool down the lubricating oil in the oil return pipeline 10. The return air pipeline 30 is connected to the return air port Y2. For example, the return air pipeline 30 may include a first pipeline 31 directly connected to the return air port Y2. A low-temperature and low-pressure gaseous refrigerant flows in the first pipeline 31. The first interface X1 is connected to the first pipeline 31, so that the refrigerant in the return air pipeline 30 can enter the cooling device 20 through the first interface X1 and cool down the high-temperature lubricating oil entering the cooling device 20. For another example, the return air pipeline 30 includes a second pipeline 32 indirectly connected to the return air port Y2 through the evaporator 300, the first interface X1 is connected to the second pipeline 32, and liquid refrigerant flows in the second pipeline 32. The liquid refrigerant can be vaporized in the cooling device 20 and absorb the heat of the high-temperature lubricating oil entering the cooling device 20 to complete the cooling of the lubricating oil. In this way, under the joint action of the return oil pipeline 10, the return air pipeline 30 and the cooling device 20, the lubricating oil can be effectively cooled to ensure that the temperature of the lubricating oil entering the return oil port Y4 is not high, thereby ensuring that the lubricating oil has a better lubricating effect on the compressor 200.

[0050] At the same time, compared to the traditional refrigerant heat exchange solution, the present application does not need to use an additional plate heat exchanger for heat exchange, and the structure of the cooling device 20 is relatively simple, and the function is also relatively easy to implement. The factory can even produce it by itself, and there is no need to purchase plate heat exchangers from a third party. Therefore, the cost of this application is relatively low. Compared with the traditional water-cooled cooling solution, the present application does not require an additional water pump, which reduces the power consumed when the system is running, making the system efficiency of this application higher. In addition, the present application uses refrigerant for heat exchange, so it can also avoid the problems of water-cooled heat exchangers being easy to scale and clog, having low reliability, and having high maintenance costs.

[0051] See also Figure 1 In some embodiments, the lubricating oil cooling recovery system 100 also includes a first ejector 40, a first input port of the first ejector 40 is connected to the first interface X1, a second input port of the first ejector 40 is connected to the exhaust pipeline 90, the exhaust pipeline 90 is connected to the exhaust port Y1 of the compressor 200, and an output port of the first ejector 40 is connected to the input port of the cooling device 20.

[0052] Specifically, the ejector is a mechanical device that uses a high-pressure and high-speed driving flow to eject and suck another fluid. The exhaust pipe 90 is connected to the exhaust pipe, so the high-temperature and high-pressure gas flows in the exhaust pipe 90, and the high-temperature and high-pressure gas can be used as the power source of the first ejector 40. The second input port of the first ejector 40 is connected to the exhaust pipe 90. In a certain embodiment, the second input port of the first ejector 40 is directly connected to the exhaust pipe 90, and the high-temperature and high-pressure gas in the exhaust pipe 90 is used as the power source of the first ejector 40. In another embodiment, the second input port of the first ejector 40 is indirectly connected to the exhaust pipe 90, and the exhaust pipe 90 can be connected to the condenser 400, and the condenser 400 is connected to the second input port of the first ejector 40. At this time, the high-temperature and high-pressure gas that is not heat exchanged in the condenser 400 can be used as the power source of the first ejector 40. The first input port of the first ejector 40 is connected to the first interface X1, and the output port of the first ejector 40 is connected to the input port of the cooling device 20.

[0053] Therefore, the first ejector 40 can use the high-temperature and high-pressure gas entering from the second input port of the first ejector 40 as a power source to eject the refrigerant of the first interface X1 into the cooling device 20. When the first interface X1 is located in the first pipeline 31, the low-temperature and low-pressure gaseous refrigerant of the first pipeline 31 will be ejected into the cooling device 20 and cool down the lubricating oil in the heat exchange pipeline 11. When the first interface X1 is located in the second pipeline 32, the liquid refrigerant of the second pipeline 32 will be ejected into the cooling device 20, and then vaporized in the cooling device 20 to absorb the heat of the lubricating oil and complete the temperature reduction.

[0054] In this way, the lubricating oil cooling recovery system 100 can utilize the first ejector 40 and use the high-temperature and high-pressure gas as a power source to smoothly eject the refrigerant from the first interface X1 into the cooling device 20, thereby ensuring that there is heat exchange between the refrigerant and the lubricating oil in the cooling device 20, thereby ensuring that the temperature of the lubricating oil entering the compressor 200 is not high.

[0055] See also Figure 1 In some embodiments, the lubricating oil cooling and recovery system 100 further includes an electric regulating valve 60 , which is connected to the input port of the cooling device 20 .

[0056] Specifically, the opening of the electric regulating valve 60 is adjustable, and the flow rate of the refrigerant entering the cooling device 20 can be adjusted by adjusting the opening of the electric regulating valve 60, thereby controlling the cooling effect of the cooling device 20. It can be understood that the greater the flow rate, the better the cooling effect. Therefore, the opening of the electric regulating valve 60 can be determined according to the temperature of the lubricating oil flowing out of the cooling device 20. For example, a preset temperature range can be set according to the temperature when the performance of the lubricating oil is high. If the temperature of the lubricating oil flowing out of the cooling device 20 is greater than the maximum value of the preset temperature range, the opening of the electric regulating valve 60 is increased. If the temperature of the lubricating oil flowing out of the cooling device 20 is less than the minimum value of the preset temperature range, the opening of the electric regulating valve 60 is reduced. If the temperature of the lubricating oil flowing out of the cooling device 20 is within the preset temperature range, the opening of the electric regulating valve 60 is kept unchanged. In this way, after adjusting the electric regulating valve 60, it can be ensured that the temperature of the lubricating oil re-entering the compressor 200 is maintained within a suitable range, thereby ensuring the lubricating effect of the lubricating oil on the compressor 200.

[0057] At the same time, the present application has relatively low requirements for the electric regulating valve 60. It only requires that the electric regulating valve 60 can adjust the flow rate of the refrigerant entering the cooling device 20. Therefore, the electric regulating valve 60 can be an electronic expansion valve or a lower-cost electric ball valve, which can reduce the manufacturing cost of the present application.

[0058] See also Figure 1 In some embodiments, the lubricating oil cooling and recovery system 100 further includes a temperature sensor 70 , which is disposed in an oil return pipe connected to the oil return port Y4 of the compressor 200 .

[0059] Specifically, the temperature sensor 70 is arranged in the return oil pipeline connected to the return oil port Y4 of the compressor 200, that is, installed in the return oil pipeline 10 between the return oil port Y4 of the compressor 200 and the heat exchange pipeline 11, so that the temperature sensor 70 can measure the temperature of the lubricating oil flowing out of the heat exchange pipeline 11. Therefore, during the operation of the lubricating oil cooling and recovery system 100, the temperature of the lubricating oil flowing through the heat exchange pipeline 11 can be measured according to the temperature sensor 70, and then the opening of the electric control valve 60 can be determined according to the measured temperature, and the higher the temperature, the larger the opening. In this way, it is possible to accurately judge whether the cooling effect of the cooling device 20 meets the requirements according to the temperature detected by the temperature sensor 70, so as to facilitate the precise control of the electric control valve 60 according to the detection result of the temperature sensor 70, and ensure that the temperature of the lubricating oil re-entering the compressor 200 is maintained within a suitable range.

[0060] See also Figure 1 In some embodiments, the cooling device 20 also includes a first filter 22 and a shell 21, the return oil pipeline 10 at least partially extends into the shell 21, the input port of the cooling device 20 and the first output port of the cooling device 20 are both located in the shell 21, the first filter 22 is installed inside the shell 21, and the first filter 22 is arranged near the first output port of the cooling device 20.

[0061] Specifically, when the compressor 200 is actually used, some lubricating oil will be discharged from the exhaust port Y1 of the compressor 200 together with the refrigerant, so it may be a mixture of refrigerant and lubricating oil that flows from the first interface X1 to the input port of the cooling device 20 and enters the cooling device 20. Too much lubricating oil mixed in the refrigerant will cause the system to lack oil and affect the operating efficiency of the air-conditioning device 1000. The first filter 22 is installed inside the housing 21. The first filter 22 can be used to filter oil droplets and oil mist contained in the gaseous refrigerant, and the lubricating oil cannot pass through the first filter 22.

[0062] The first filter 22 is disposed near the first output port of the cooling device 20. When the first interface X1 is connected to the first pipeline 31, the gaseous refrigerant and lubricating oil in the first pipeline 31 can enter the cooling device 20. After heat exchange, the gaseous refrigerant can directly pass through the first filter 22 and flow to the first output port of the cooling device 20, then flow to the return air pipeline 30, and finally return to the compressor 200. The lubricating oil cannot pass through the first filter 22 and gathers at the bottom of the cooling device 20.

[0063] When the first interface X1 is connected to the second pipeline 32, the liquid refrigerant and lubricating oil in the second pipeline 32 can enter the cooling device 20, and the liquid refrigerant will become gaseous refrigerant after being gasified in the cooling device 20. The gaseous refrigerant passes through the first filter 22. The relatively pure gaseous refrigerant after separation can pass through the first output port of the cooling device 20 and the return air pipeline 30 in sequence, and finally return to the compressor 200 to achieve recirculation. The lubricating oil cannot pass through the first filter 22 and gathers at the bottom of the cooling device 20.

[0064] See also Figure 1 In some embodiments, the lubricating oil cooling and recovery system 100 further includes an oil tank 50, the oil tank 50 includes a second filter 51, an oil pump 52 and a housing 53, and the housing 53 is provided with a first input port of the oil tank 50, a first output port of the oil tank 50 and a second output port of the oil tank 50. The oil tank 50 is installed in the oil return pipeline 10, and the first input port of the oil tank 50 is connected to the oil discharge port Y3 of the compressor 200, the first output port of the oil tank 50 is connected to the return port Y2 of the compressor 200, and the second output port of the oil tank 50 corresponds to the cooling device 20. The second filter 51 and the oil pump 52 are installed inside the housing 53, the second filter 51 is arranged near the first output port of the oil tank 50, and the oil pump 52 is arranged near the second output port of the oil tank 50.

[0065] Specifically, the second filter 51 can be used to filter the oil droplets and oil mist contained in the gaseous refrigerant, and the lubricating oil cannot pass through the second filter 51. During the operation of the compressor 200, part of the refrigerant may be discharged from the oil discharge port Y3 of the compressor 200 together with the lubricating oil. The second filter 51 is arranged near the first output port of the oil tank 50. At this time, the second filter 51 of the oil tank 50 can be used to separate the gaseous refrigerant and the lubricating oil. The separated lubricating oil gathers at the bottom of the oil tank 50, and the gaseous refrigerant flows to the return air port Y2 of the compressor 200 through the first output port of the oil tank 50, thereby returning to the compressor 200. The oil pump 52 can be used to drive the flow of the lubricating oil, and the oil pump 52 is arranged near the second output port of the oil tank 50. The second output port of the oil tank 50 corresponds to the cooling device 20. Therefore, the oil pump 52 can drive the lubricating oil to flow out from the second output port of the oil tank 50, so that the lubricating oil can flow into the heat exchange pipeline 11 located in the cooling device 20 for heat exchange. Therefore, during the operation of the lubricating oil cooling and recovery system 100, the lubricating oil heated by absorbing the heat generated by the mechanical bearings inside the compressor 200 during operation flows back to the oil tank 50 and is then transported to the heat exchange pipeline 11 located in the cooling device 20 through the oil pump 52.

[0066] In this way, the oil tank 50 can be used to achieve gas-liquid separation, so as to realize the recovery of lubricating oil and refrigerant, so that the refrigerant discharged from the oil discharge port Y3 of the compressor 200 can be returned to the compressor 200, and the oil pump 52 can be used to provide power to the lubricating oil in the oil tank 50, ensuring that the lubricating oil can flow to the heat exchange pipeline 11 for heat exchange and return to the compressor 200, thereby ensuring that the lubricating oil can complete the cooling on the one hand, and ensuring that the lubricating oil discharged from the compressor 200 can be returned to the compressor 200 on the other hand, thereby preventing the compressor 200 from wearing due to lack of oil.

[0067] See also Figure 1 In some embodiments, the lubricating oil cooling recovery system 100 also includes a second ejector 80, a first input port of the second ejector 80 is connected to an exhaust pipe 90, the exhaust pipe 90 is connected to an exhaust port Y1 of the compressor 200, a second input port of the second ejector 80 is connected to a second output port of the cooling device 20, the second output port of the cooling device 20 is located at the bottom of the cooling device 20, and an output port of the second ejector 80 is connected to a second input port of the oil tank 50.

[0068] Specifically, after a certain period of separation of the mixture of lubricating oil and refrigerant in the cooling device 20, a large amount of lubricating oil will accumulate in the cooling device 20. In order to effectively recover this part of the lubricating oil into the oil tank 50, a second ejector 80 may also be provided.

[0069] The first input port of the second ejector 80 can be directly connected to the exhaust pipe 90, and the second ejector 80 can directly obtain the high-temperature gas in the exhaust pipe 90 as a power source. The first input port of the second ejector 80 can also be indirectly connected to the exhaust pipe 90, for example, the first input port of the second ejector 80 is connected to the condenser 400, and the exhaust pipe 90 is connected to the condenser 400, and the second ejector 80 can use the high-temperature gas in the condenser 400 as a power source. The second output port of the cooling device 20 is located at the bottom of the cooling device 20, so that the lubricating oil stored in the cooling device 20 can be discharged from the cooling device 20 through the second output port of the cooling device 20. Of course, the second output port of the cooling device 20 can also be located in the area near the bottom of the side wall of the cooling device 20. Therefore, the second ejector 80 can use the high-temperature gas in the exhaust pipe 90 or the high-temperature gas in the condenser 400 as a power source to eject the lubricating oil into the oil tank 50. After the lubricating oil is delivered to the oil tank 50, it can flow to the heat exchange pipeline 11 through the oil return pipeline 10 for heat exchange. After the heat exchange is completed, the lubricating oil can flow to the oil return port Y4 of the compressor 200, thereby returning to the compressor 200. At the same time, if the second ejector 80 is working, a small amount of liquid refrigerant is also ejected into the oil tank 50, then the second filter 51 of the oil tank 50 can also separate the small amount of lubricating oil contained in the liquid refrigerant, and the separated lubricating oil can be gathered in the oil tank 50, and the separated relatively pure gaseous refrigerant can be returned to the return port Y2 of the compressor 200 through the first output port of the oil tank 50 for recirculation.

[0070] In this way, the lubricating oil stored in the cooling device 20 can be moved to the oil tank 50 under the action of the second ejector 80, so that the lubricating oil can be cooled subsequently and enter the compressor 200 after cooling, thereby facilitating the oil return of the compressor 200 and preventing the compressor 200 from lack of oil and wear.

[0071] See also Figure 1 In some embodiments, the lubricating oil cooling and recovery system 100 further includes a solenoid valve 110 , which is installed between the output port of the second ejector 80 and the second input port of the oil tank 50 .

[0072] Specifically, the solenoid valve 110 is installed between the output port of the second ejector 80 and the second input port of the oil tank 50. It can be understood that when the solenoid valve 110 is turned on, the output port of the second ejector 80 is connected to the second input port of the oil tank 50, and the second ejector 80 can eject the lubricating oil in the cooling device 20 to the oil tank 50. When the solenoid valve 110 is closed, the output port of the second ejector 80 is not connected to the second input port of the oil tank 50, and the second ejector 80 cannot eject the lubricating oil in the cooling device 20 to the oil tank 50. Therefore, the solenoid valve 110 can be used as a device for starting the second ejector 80, that is, as a starting device for returning oil to the cooling device 20. In the case where the cooling device 20 stores a lot of lubricating oil, the solenoid valve 110 can be started so that the lubricating oil in the cooling device 20 can be ejected into the oil tank 50, and the subsequent lubricating oil can return to the compressor 200 along the oil return pipeline 10, ensuring that too much lubricating oil is not stored in the cooling device 20, and preventing the compressor 200 from lacking oil. When the cooling device 20 stores less lubricating oil, the solenoid valve 110 may be closed to prevent the solenoid valve 110 from being in the start-up state for a long time, so as to reduce unnecessary energy consumption of the solenoid valve 110 .

[0073] See also Figure 1 In some embodiments, the cooling device 20 further includes an oil level indicator 23 and a shell 21 , wherein the oil level indicator 23 is located inside the shell 21 and is installed at the bottom of the shell 21 .

[0074] Specifically, the oil level indicator 23 can provide an electronic signal to feedback the oil level, and the oil level indicator 23 is located inside the shell 21 and installed at the bottom of the shell 21, so that the oil level indicator 23 can detect the oil level in the cooling device 20.

[0075] The oil level indicator 23 can be an oil level switch that feeds back a switch quantity control signal. When the oil level in the cooling device 20 is higher than the oil level threshold, the switch quantity signal is closed. The oil level indicator 23 can also be a liquid level gauge that can accurately reflect the oil level height based on the analog control signal. The oil level indicator 23 can be used to reflect the oil level in the cooling device 20. At this time, the oil level threshold can be set according to the need for oil return. When the oil level indicator 23 shows that the oil level in the cooling device 20 is higher than the oil level threshold, the solenoid valve 110 can be opened to inject the lubricating oil in the cooling device 20 into the oil tank 50. When the oil level in the cooling device 20 is lower than the oil level threshold, the solenoid valve 110 can be closed to prevent part of the liquid refrigerant from being injected into the oil tank 50 by the second injector 80 before being gasified after the lubricating oil in the cooling device 20 is evacuated.

[0076] In this way, the oil level indicator 23 can be used to accurately determine the oil return time of the cooling device 20, so as to prevent excessive lubricating oil from being stored in the cooling device 20, thereby preventing the compressor 200 from being short of oil, and reducing unnecessary energy consumption of the solenoid valve 110.

[0077] For the oil return system, the existing technical solution usually adopts the method of directly introducing the mixture of lubricating oil and refrigerant into the oil tank 50. The liquid refrigerant flashes into gas due to the pressure reduction and flows into the return port Y2 of the compressor 200 through the return gas balance pipe. After compression, it is discharged into the condenser 400 and cooled into liquid refrigerant and lubricating oil. After circulation, it enters the evaporator 300, and the cycle repeats. However, a large amount of liquid refrigerant evaporates into gas in the oil tank 50 and absorbs heat, causing the temperature of the lubricating oil to drop. After the oil temperature drops, the solubility of the refrigerant increases and the viscosity of the lubricating oil decreases. At the same time, the liquid refrigerant flashes at the inlet of the refrigerant pump, causing the oil supply to be unstable, and the lubricating oil cooling and recovery system 100 will alarm and shut down, and even damage the bearings. In addition, a large amount of gas refrigerant in the oil tank 50 entrains oil droplets and escapes through the return gas balance pipe at a higher flow rate. The separation efficiency of the filter screen in the oil tank 50 is reduced, causing the unit to leak oil into the system, affecting the heat exchange efficiency and reducing the system performance. In serious cases, the unit will be unable to operate due to lack of oil.

[0078] The oil tank 50 of the present application receives gaseous refrigerant and lubricating oil, and the oil tank 50 has a gas-liquid separation function. The gaseous refrigerant can be directly returned to the compressor 200, and the lubricating oil can be cooled by the cooling device 20, so that the temperature of the lubricating oil returned to the compressor 200 is within a suitable range, and the viscosity of the lubricating oil is better. The mixture of lubricating oil and refrigerant in the evaporator 300 is injected into the cooling device 20, and the liquid refrigerant can be gasified in the cooling device 20 to form a gaseous refrigerant. Under the action of the first filter 22, the lubricating oil and the gaseous refrigerant can be separated smoothly, and the separated lubricating oil can be stored in the cooling device 20, and then the oil is returned. The separated gaseous refrigerant can return to the compressor 200 along the first output port of the cooling device 20. In this way, the cooling device 20 and the oil tank 50 can also play the role of gas-liquid separation, so that the cooling device 20 can effectively realize the cooling and recovery of the lubricating oil, so as to facilitate the subsequent return of the lubricating oil, so that the compressor 200 will not be short of oil in the future, thereby facilitating the improvement of heat exchange efficiency and system performance. At the same time, under the gas-liquid separation effect of the oil tank 50 and the cooling device 20, it can be ensured that no large amount of liquid refrigerant will appear in the oil return port Y4 of the compressor 200, thereby ensuring the stable oil supply of the compressor 200 and preventing alarm shutdown or even damage to the bearings.

[0079] It should be noted that the heat exchange pipeline 11 can be an internal pipeline of the cooling device 20. In this case, the oil return pipeline 10 includes the heat exchange pipeline 11 which is the internal pipeline of the cooling device 20, and the external pipeline outside the cooling device 20. In this way, the cooling device 20 actually includes a shell, a first filter 22, an oil level indicator 23 and a heat exchange pipeline 11, and these devices are easy to obtain, and the structure of the cooling device 20 is relatively simple. In actual use, each factory can even produce the cooling device 20 by itself, without the need to purchase a third-party plate heat exchanger as in the existing refrigerant cooling technology solution. Therefore, the present application can further reduce the manufacturing cost.

[0080] In summary, please refer to Figure 1 The first interface X1 of the lubricating oil cooling and recovery system 100 of the present application is located in the second pipeline 32, the input port of the cooling device 20 can be connected to the evaporator 300, the second pipeline 32 is connected to the evaporator 300, and the first interface X1 is indirectly connected to the return air pipeline 30. The working process of the lubricating oil cooling and recovery system 100 can be as follows:

[0081] The lubricating oil of the compressor 200 can be discharged from the oil discharge port Y3 of the compressor 200, and then moved to the oil tank 50 through the oil return line 10, and moved to the heat exchange pipe located in the cooling device 20 under the action of the oil pump 52. At the same time, the gaseous refrigerant discharged from the oil discharge port Y3 of the compressor 200 together with the lubricating oil can be separated from the lubricating oil by the action of the second filter 51, and flow to the return port Y2 of the compressor 200, thereby returning to the compressor 200. The high-pressure gas in the condenser 400 can be used as a power source for the first ejector 40 to eject the mixture of the liquid refrigerant and the lubricating oil in the evaporator 300, pass through the electric regulating valve 60, and flow into the cooling device 20. Since the cooling device 20 is connected to the return gas pipeline 30, a low-pressure environment is formed in the cooling device 20, and the liquid refrigerant can be vaporized and absorb the heat of the lubricating oil in the heat exchange pipeline 11, so that the temperature of the lubricating oil flowing out of the heat exchange pipeline 11 is low, and the subsequent lubricating oil can continue to return to the compressor 200 along the return oil pipeline 10. The vaporized liquid refrigerant can flow out from the first output port of the cooling device 20 and return to the compressor 200. At the same time, the temperature sensor 70 can detect the temperature of the lubricating oil flowing out of the heat exchange pipeline 11, so the opening of the electric regulating valve 60 can be adjusted according to the temperature of the lubricating oil flowing out of the heat exchange pipeline 11 to control the temperature of the lubricating oil flowing out of the heat exchange pipeline 11, and ensure that the temperature of the lubricating oil entering the compressor 200 can be within a suitable range.

[0082] Under the action of the first filter 22 of the cooling device 20, the lubricating oil entering the cooling device 20 will be stored. When the oil level indicator 23 shows that the oil level of the cooling device 20 is higher than the preset oil level threshold, the electric valve can be opened. At this time, the second ejector 80 can use the high-pressure gas in the condenser 400 as a power source to eject the lubricating oil of the cooling device 20 into the oil tank 50. Then the lubricating oil can return to the compressor 200 along the oil return line 10, thereby completing the oil return.

[0083] See also Figure 1 An embodiment of the present application provides an air conditioning device 1000, the air conditioning device 1000 includes a compressor 200 and a lubricating oil cooling and recovery system 100 as described in any of the above embodiments, the compressor 200 includes an exhaust port Y1, an air return port Y2, an oil discharge port Y3 and an oil return port Y4.

[0084] The lubricating oil cooling and recovery system 100 of the air-conditioning device 1000 of the embodiment of the present application includes an oil return pipeline 10 and a cooling device 20. The high-temperature lubricating oil of the compressor 200 of the air-conditioning device 1000 can enter the cooling device 20 through the oil return pipeline 10. The input port of the cooling device 20 is connected to the first interface X1 of the return air pipeline 30. The return air pipeline 30 is connected to the return air port Y2. For example, the return air pipeline 30 may include a first pipeline 31 directly connected to the return air port Y2. A low-temperature and low-pressure gaseous refrigerant flows in the first pipeline 31. The first interface X1 is connected to the first pipeline 31, so that the refrigerant in the return air pipeline 30 can enter the cooling device 20 through the first interface X1, and the high-temperature lubricating oil entering the cooling device 20 is cooled down. For another example, the return air pipeline 30 includes a second pipeline 32 indirectly connected to the return air port Y2 through the evaporator 300, the first interface X1 is connected to the second pipeline 32, and liquid refrigerant flows in the second pipeline 32. The liquid refrigerant can be vaporized in the cooling device 20 and absorb the heat of the high-temperature lubricating oil entering the cooling device 20 to complete the cooling of the lubricating oil. In this way, under the joint action of the return oil pipeline 10, the return air pipeline 30 and the cooling device 20, the lubricating oil can be effectively cooled to ensure that the temperature of the lubricating oil entering the return oil port Y4 is not high, thereby ensuring that the lubricating oil has a better lubricating effect on the compressor 200.

[0085] Thus, compared with the prior art, the lubricating oil cooling and recovery system 100 and the air conditioning device 1000 of the present application have the following advantages:

[0086] 1. Improve efficiency: Compared with the traditional "refrigerant cooling" and "water cooling" methods, the lubricating oil cooling and recovery system 100 of the present application can achieve energy exchange without the aid of additional liquid refrigerant and cooling water, so no additional work is required, which helps to improve system efficiency. Furthermore, the present application can efficiently recover the lubricating oil in the system while achieving lubricating oil cooling, avoiding the reduction of heat exchange efficiency after the lubricating oil and refrigerant are mixed, resulting in a reduction in system performance.

[0087] 2. Safe and reliable: The lubricating oil cooling and recovery system 100 of the present application can effectively realize the cooling and recovery of lubricating oil. First, the cooling temperature of high-temperature lubricating oil can be accurately controlled through the temperature sensor 70 and the electric regulating valve 60. At the same time, through the oil tank 50 and the cooling device 20, the lubricating oil cooling and recovery system 100 of the present application can realize the efficient separation of the lubricating oil and refrigerant mixture and the recovery of the separated lubricating oil.

[0088] On the one hand, the lubricating oil cooling and recovery system 100 of the present application can avoid the abnormal shutdown of the air-conditioning equipment 1000 caused by the limitation of the system operation range in the traditional refrigerant cooling scheme and the scaling and clogging of the system in the traditional water-cooling cooling scheme. On the other hand, while the cooling device 20 realizes the cooling of the lubricating oil, the mixture of the lubricating oil and the refrigerant injected into the cooling device 20 is heated, and the separation of the lubricating oil and the refrigerant can be realized, and the separated lubricating oil is recovered again into the oil tank 50. The lubricating oil cooling and recovery system 100 of the present application can avoid the problem of unstable oil supply caused by the large solubility of the refrigerant in the lubricating oil in the traditional scheme of introducing a large amount of the mixture of the lubricating oil and the refrigerant into the oil tank 50, and the liquid refrigerant is vaporized in the oil tank 50 to reduce the oil temperature, thereby causing the refrigerant in the lubricating oil to increase. At the same time, it can also avoid the problem of a large amount of gaseous refrigerant escaping from the oil tank 50 in the traditional scheme, reducing the efficiency of the separation filter of the oil tank 50 and causing the system to leak oil.

[0089] 3. Reduce costs: The lubricating oil cooling and recovery system 100 of the present application does not need to use expensive plate heat exchangers and electronic expansion valves, which helps to reduce costs.

[0090] It should be noted that the air conditioning device 1000 of the present application adopts a chiller, the functions of the evaporator 300 and the condenser 400 are fixed, and the moving direction of the refrigerant in the air conditioning device 1000 is fixed. When the air conditioning device 1000 needs to be cooled, the circulating water exchanges heat with the evaporator 300 to produce cold water, and then the cold water can enter the room and exchange heat with the indoor air to complete the cooling. When the air conditioning device 1000 needs to be heated, the circulating water exchanges heat with the condenser 400 to produce hot water, and then the hot water can enter the room and exchange heat with the indoor air to complete the heating. Therefore, the working mode of the air conditioning device 1000 does not affect the flow direction of the refrigerant and the lubricating oil. In both the cooling and heating modes, the present application can achieve the above-mentioned beneficial effects.

[0091] See also Figure 1 and Figure 3 The embodiment of the present application provides a control method, the control method is used for a lubricating oil cooling and recovery system 100, the lubricating oil cooling and recovery system 100 is applied to an air conditioning device 1000, the air conditioning device 1000 includes a compressor 200, the compressor 200 includes an exhaust port Y1, a return port Y2, an oil discharge port Y3 and an oil return port Y4; the lubricating oil cooling and recovery system 100 includes an oil return pipeline 10, a cooling device 20 and an electric regulating valve 60, the two ends of the oil return pipeline 10 are respectively connected to the oil discharge port Y3 and the oil return port Y4; the cooling device 20 includes an input port and a first output port, the input port is connected to the first interface X1 of the return air pipeline 30, the first output port is connected to the second interface X2 of the return air pipeline 30, and the return air pipeline 30 is connected to the return air port Y2; at least part of the oil return pipeline 10 is located in the cooling device 20, the electric regulating valve 60 is connected to the input port of the cooling device 20, and the electric regulating valve 60 is connected to the input port of the cooling device 20, and the control method also includes:

[0092] Step 01: Adjust the opening of the electric regulating valve 60 according to the current oil temperature corresponding to the first output port of the cooling device 20, so that the oil temperature corresponding to the oil return port Y4 of the compressor 200 is within a preset oil temperature range after adjustment.

[0093] Specifically, the lubricating oil cooling and recovery system 100 may further include a controller, which is used to execute the control method. The oil temperature has an impact on the performance of the lubricating oil, so the preset oil temperature range can be set according to the oil temperature when the lubricating oil has better performance, or the target setting value can be set according to the oil temperature when the lubricating oil has the best performance, and then the preset oil temperature range is determined in combination with the control tolerance.

[0094] At least part of the oil return line 10 is located in the cooling device 20, and the part of the oil return line 10 located in the cooling device 20 can be considered as the heat exchange line 11. The lubricating oil of the compressor 200 can flow along the oil return line 10 until it flows to the heat exchange line 11. The refrigerant of the first interface X1 of the return air line 30 can enter the cooling device 20 through the input port of the cooling device 20, and heat the lubricating oil in the heat exchange line 11. Then, the current oil temperature corresponding to the oil return port Y4 of the compressor 200 can be obtained. For example, the lubricating oil cooling and recovery system 100 also includes a temperature sensor 70, and the temperature sensor 70 is arranged in the oil return pipeline connected to the oil return port Y4 of the compressor 200. At this time, the current oil temperature can be determined according to the detection result of the temperature sensor 70, that is, the oil temperature of the lubricating oil flowing out of the heat exchange pipeline can be determined. Then, the opening of the electric regulating valve 60 is adjusted according to the current oil temperature and the preset oil temperature range corresponding to the oil return port Y4 of the compressor 200. For example, proportional-integral-derivative (PID) adjustment can be performed according to the current oil temperature and the preset oil temperature range. When the current oil temperature is greater than the maximum value of the preset oil temperature range, the opening of the electric regulating valve 60 is increased, and when the current oil temperature is less than the minimum value of the preset oil temperature range, the opening of the electric regulating valve 60 is reduced. The lubricating oil flowing out of the heat exchange pipeline 11 has completed heat exchange, and the lubricating oil that has completed heat exchange can continue to return to the compressor 200 along the oil return pipeline 10. The refrigerant that has completed heat exchange can flow to the return air port Y2 of the compressor 200 through the first output port of the cooling device 20, thereby circulating again.

[0095] In this way, the amount of refrigerant flowing into the cooling device 20 can be adjusted according to the electric regulating valve 60 to adjust the cooling effect of the cooling device 20, so that the oil temperature of the return oil port Y4 of the compressor 200 after adjustment can be within the preset oil temperature range, so as to ensure that the oil temperature of the lubricating oil entering the compressor 200 is within the preset oil temperature range, thereby ensuring the performance of the lubricating oil, so that the lubricating oil has a better lubricating effect on the compressor 200.

[0096] The lubricating oil cooling and recovery system 100 of the embodiment of the present application includes a compressor 200, an oil return pipeline 10 and a cooling device 20. The high-temperature lubricating oil of the compressor 200 can enter the cooling device 20 through the oil return pipeline 10. The input port of the cooling device 20 is connected to the first interface X1 of the return air pipeline 30. The return air pipeline 30 is connected to the return air port Y2. For example, the return air pipeline 30 may include a first pipeline 31 directly connected to the return air port Y2. A low-temperature and low-pressure gaseous refrigerant flows in the first pipeline 31. The first interface X1 is connected to the first pipeline 31, so that the refrigerant in the return air pipeline 30 can enter the cooling device 20 through the first interface X1, and the high-temperature lubricating oil entering the cooling device 20 is cooled down. For another example, the return air pipeline 30 includes a second pipeline 32 indirectly connected to the return air port Y2 through the evaporator 300, the first interface X1 is connected to the second pipeline 32, and liquid refrigerant flows in the second pipeline 32. The liquid refrigerant can be vaporized in the cooling device 20 and absorb the heat of the high-temperature lubricating oil entering the cooling device 20 to complete the cooling of the lubricating oil. At the same time, the opening of the electric regulating valve 60 can be adjusted according to the current oil temperature corresponding to the return oil port Y4 of the compressor 200, so that the oil temperature of the return oil port Y4 of the compressor 200 after adjustment can be within the preset oil temperature range, so as to effectively cool the lubricating oil and ensure that the oil temperature of the lubricating oil entering the compressor 200 is within the preset oil temperature range, thereby ensuring that the lubricating oil has a better lubrication effect on the compressor 200.

[0097] See also Figure 1 and Figure 4 In some embodiments, the lubricating oil cooling and recovery system 100 further includes an oil tank 50, a second ejector 80 and a solenoid valve 110. The oil tank 50 includes a second filter 51 and an oil pump 52. The oil tank 50 is installed on the oil return pipeline 10, and the first input port of the oil tank 50 is connected to the oil discharge port Y3 of the compressor 200, the first output port of the oil tank 50 is connected to the return air port Y2 of the compressor 200, the second output port of the oil tank 50 corresponds to the cooling device 20, the first input port of the second ejector 80 is connected to the exhaust pipeline 90, the exhaust pipeline 90 is connected to the exhaust port Y1 of the compressor 200, the second input port of the second ejector 80 is connected to the second output port of the cooling device 20, the second output port of the cooling device 20 is located at the bottom of the cooling device 20, the output port of the second ejector 80 is connected to the second input port of the oil tank 50, the solenoid valve 110 is installed between the output port of the second ejector 80 and the second input port of the oil tank 50, and the control method further includes:

[0098] Step 02: When the current oil level of the cooling device 20 is greater than a preset oil level threshold, the solenoid valve 110 is controlled to open.

[0099] Specifically, the second ejector 80 can use the high-pressure gas in the exhaust pipe 90 as a power source to eject the lubricating oil stored in the cooling device 20 into the oil tank 50, and the opening and closing of the solenoid valve 110 can be used to control the opening and closing of the second ejector 80, that is, to control the oil return of the cooling device 20. When the lubricating oil cooling and recovery system 100 is started, the solenoid valve 110 is in a closed state, and the solenoid valve 110 is in an open state only when oil return is required.

[0100] First, a preset oil level threshold value when the cooling device 20 needs to return oil can be set. When the oil level of the cooling device 20 is greater than the preset oil level threshold value, the solenoid valve 110 can be opened to return oil. During the operation of the lubricating oil cooling and recovery system 100, the current oil level of the cooling device 20 can be obtained. When the current oil level of the cooling device 20 is greater than the preset oil level threshold value, it can be considered that the cooling device 20 stores more lubricating oil and needs to return oil. Therefore, the solenoid valve 110 can be controlled to open so that the second ejector 80 can eject the lubricating oil stored in the cooling device 20 into the oil tank 50. After the lubricating oil flows into the oil tank 50, it can enter the oil return pipeline 10 through the oil pump 52, and then enter the heat exchange pipeline 11 to exchange heat with the refrigerant in the cooling device 20. After the heat exchange, it continues to flow along the oil return pipeline 10 until it enters the compressor 200, so that the oil return is completed. When the oil level of the cooling device 20 is less than the preset oil level threshold value, the solenoid valve 110 can be closed to stop the oil return.

[0101] In this way, the oil return of the cooling device 20 can be controlled by the solenoid valve 110. When the current oil level of the cooling device 20 is greater than the preset oil level threshold, the solenoid valve 110 is controlled to open, so that the lubricating oil of the cooling device 20 is injected into the oil tank 50, so that the lubricating oil can re-enter the compressor 200 along the oil return pipeline 10, so as to ensure that too much lubricating oil is not stored in the cooling device 20, and prevent the compressor 200 from being short of oil.

[0102] See also Figure 1 and Figure 5 In some embodiments, the cooling device 20 further includes an oil level indicator 23 and a housing 21, the oil level indicator 23 is located inside the housing 21 and is installed at the bottom of the housing 21, and the control method further includes:

[0103] Step 03: Determine whether the current oil level of the cooling device 20 is greater than a preset oil level threshold value based on the detection result of the oil level indicator 23.

[0104] Specifically, the oil level indicator 23 can be used to detect whether the current oil level of the cooling device 20 is greater than the preset oil level threshold. In one embodiment, the oil level indicator 23 is an oil level switch that feeds back a switch control signal. When the oil level in the cooling device 20 is higher than the preset oil level threshold, the switch signal is closed. At this time, the detection result of the oil level indicator 23 is the switch signal. Therefore, when the switch signal is closed, it can be determined that the current oil level is greater than the preset oil level threshold. If the switch signal is not closed, it means that the current oil level is less than the preset oil level threshold. In another embodiment, the oil level indicator 23 is a liquid level gauge that can accurately reflect the oil level height based on an analog control signal. At this time, the detection result of the oil level indicator 23 is the oil level height. After obtaining the oil level height of the current oil level, it can be combined with the preset oil level threshold to determine whether the current oil level is greater than the preset oil level threshold.

[0105] In this way, the oil level indicator 23 in the cooling device 20 can be used to accurately determine the oil return time, so that the switch of the solenoid valve 110 can be controlled according to the detection result of the oil level indicator 23 to ensure that too much lubricating oil is not stored in the cooling device 20 and prevent the compressor 200 from being short of oil.

[0106] See also Figure 1 and Figure 6 In some embodiments, step 03: determining whether the current oil level of the cooling device 20 is greater than a preset oil level threshold value according to the detection result of the oil level indicator 23, includes:

[0107] Step 031: After determining that the air conditioning device 1000 is started and has run for a preset time, determine whether the current oil level of the cooling device 20 is greater than a preset oil level threshold value based on the detection result of the oil level indicator 23.

[0108] Specifically, a certain amount of lubricating oil will be stored in the cooling device 20 only after the air conditioning device 1000 has been running for a period of time. Therefore, the preset time can be determined according to the speed at which the cooling device 20 stores lubricating oil after the air conditioning device 1000 has been running for a period of time. Only after the air conditioning device 1000 has been running for a preset time is it considered that a certain amount of lubricating oil is stored in the cooling device 20, and the issue of whether oil return is needed needs to be considered later. Therefore, after determining that the air conditioning device 1000 has been started and running for a preset time, the detection result of the oil level indicator 23 is obtained, and it is determined whether the current oil level of the cooling device 20 is greater than the preset oil level threshold.

[0109] When the air conditioning device 1000 is just started, it can be considered that the lubricating oil in the cooling device 20 is less, and the detection result of the oil level indicator 23 is not obtained at this time, so as to reduce the energy consumption of the controller when obtaining the oil level indicator 23. The detection result of the oil level indicator 23 is obtained after the air conditioning device 1000 runs for a preset time, so as to timely find that the current oil level is greater than the preset oil level threshold, thereby ensuring that the lubricating oil cooling recovery system 100 and the air conditioning device 1000 can achieve accurate oil return and prevent the compressor 200 from lacking oil.

[0110] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0111] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0112] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A lubricating oil cooling and recovery system, characterized in that: Applied to air conditioning equipment, the air conditioning equipment includes a compressor, the compressor includes an exhaust port, an air return port, an oil discharge port and an oil return port; the lubricating oil cooling and recovery system includes: An oil return pipeline, the two ends of which are respectively connected to the oil discharge port and the oil return port; A cooling device, the cooling device comprising an input port and a first output port, the input port of the cooling device being connected to a first interface of a return air pipeline, the first output port of the cooling device being connected to a second interface of the return air pipeline, the return air pipeline being connected to the return air port, and at least a portion of the return oil pipeline being located within the cooling device.

2. The lubricating oil cooling and recovery system according to claim 1, characterized in that: The air conditioning equipment also includes an evaporator and a condenser. The compressor, the evaporator and the condenser are connected in pairs. The return air pipeline at least includes a first pipeline between the return air port and the exhaust port of the evaporator. The second interface is located in the first pipeline.

3. The lubricating oil cooling and recovery system according to claim 2, characterized in that: The return air pipeline includes a first pipeline between the return air port and the evaporator, and a second pipeline between the evaporator and the condenser, and the first interface is located in the second pipeline.

4. The lubricating oil cooling and recovery system according to claim 2 or 3, characterized in that: The lubricating oil cooling and recovery system also includes a first ejector, a first input port of the first ejector is connected to the first interface, a second input port of the first ejector is connected to an exhaust pipeline, the exhaust pipeline is connected to the exhaust port of the compressor, and an output port of the first ejector is connected to an input port of the cooling device.

5. The lubricating oil cooling and recovery system according to claim 1, characterized in that: The lubricating oil cooling and recovery system further comprises an electric regulating valve, and the electric regulating valve is connected to the input port of the cooling device.

6. The lubricating oil cooling and recovery system according to claim 5, characterized in that: The lubricating oil cooling and recovery system further comprises a temperature sensor, and the temperature sensor is arranged in an oil return pipeline connected to the oil return port of the compressor.

7. The lubricating oil cooling and recovery system according to claim 1, characterized in that: The cooling device also includes a first filter and a shell, the return oil pipeline at least partially extends into the shell, the input port of the cooling device and the first output port of the cooling device are both located in the shell, the first filter is located inside the shell, and the first filter is arranged close to the first output port of the cooling device.

8. The lubricating oil cooling and recovery system according to claim 1, characterized in that: The lubricating oil cooling and recovery system further comprises an oil tank, the oil tank comprises a second filter screen, an oil pump and a housing, the housing is provided with a first input port of the oil tank, a first output port of the oil tank and a second output port of the oil tank; The oil tank is installed on the oil return pipeline, and the first input port of the oil tank is connected to the oil discharge port of the compressor, the first output port of the oil tank is connected to the return air port of the compressor, the second output port of the oil tank corresponds to the cooling device, the second filter screen and the oil pump are installed inside the shell, the second filter screen is arranged near the first output port of the oil tank, and the oil pump is arranged near the second output port of the oil tank.

9. The lubricating oil cooling and recovery system according to claim 8, characterized in that: The lubricating oil cooling and recovery system also includes a second ejector, a first input port of the second ejector is connected to an exhaust pipeline, the exhaust pipeline is connected to the exhaust port of the compressor, a second input port of the second ejector is connected to a second output port of the cooling device, the second output port of the cooling device is located at the bottom of the cooling device, and the output port of the second ejector is connected to the second input port of the oil tank.

10. The lubricating oil cooling and recovery system according to claim 9, characterized in that: The lubricating oil cooling and recovery system further comprises a solenoid valve, which is installed between the output port of the second ejector and the second input port of the oil tank.

11. The lubricating oil cooling and recovery system according to claim 10, characterized in that: The cooling device further comprises an oil level indicator and a shell. The oil level indicator is located inside the shell and is installed at the bottom of the shell.

12. The lubricating oil cooling and recovery system according to claim 1, characterized in that: The cooling device includes a shell, and the oil return pipeline includes a heat exchange pipeline, a first connecting pipeline and a second connecting pipeline. The first connecting pipeline connects the input port of the heat exchange pipeline with the oil return port of the compressor, and the second connecting pipeline connects the output port of the heat exchange pipeline with the oil discharge port of the compressor. The heat exchange pipeline is arranged inside the shell of the cooling device, and the heat exchange pipeline is spiral.

13. An air conditioning device, characterized in that: include: A compressor, the compressor comprising an exhaust port, an air return port, an oil discharge port and an oil return port; and The lubricating oil cooling and recovery system according to any one of claims 1 to 12.

14. A control method, the control method is used for a lubricating oil cooling and recovery system, the lubricating oil cooling and recovery system is applied to air conditioning equipment, the air conditioning equipment includes a compressor, the compressor includes an exhaust port, an air return port, an oil drain port and an oil return port; the lubricating oil cooling and recovery system includes an oil return pipeline, a cooling device and an electric regulating valve; the two ends of the oil return pipeline are respectively connected to the oil drain port and the oil return port; the cooling device includes an input port and a first output port, the input port is connected to a first interface of the air return pipeline, the first output port is connected to a second interface of the air return pipeline, and the air return pipeline is connected to the air return port; at least part of the oil return pipeline is located in the cooling device, the electric regulating valve is connected to the input port of the cooling device, and the electric regulating valve is connected to the input port of the cooling device, and the control method also includes: The opening of the electric regulating valve is adjusted according to the current oil temperature corresponding to the first output port of the cooling device, so that the oil temperature corresponding to the oil return port of the compressor after adjustment is within a preset oil temperature range.

15. The control method according to claim 14, characterized in that: The lubricating oil cooling and recovery system further includes a temperature sensor, and the temperature sensor is arranged in an oil return pipeline connected to the oil return port of the compressor. The control method further includes: The current oil temperature is determined according to the detection result of the temperature sensor.

16. The control method according to claim 14, characterized in that: The lubricating oil cooling and recovery system also includes an oil tank, a second ejector and a solenoid valve, the oil tank includes a second filter and an oil pump, the oil tank is installed on the oil return pipeline, and the first input port of the oil tank is connected to the oil discharge port of the compressor, the first output port of the oil tank is connected to the return air port of the compressor, the second output port of the oil tank corresponds to the cooling device, the first input port of the second ejector is connected to the exhaust pipeline, the exhaust pipeline is connected to the exhaust port of the compressor, the second input port of the second ejector is connected to the second output port of the cooling device, the second output port of the cooling device is located at the bottom of the cooling device, the output port of the second ejector is connected to the second input port of the oil tank, the solenoid valve is installed between the output port of the second ejector and the second input port of the oil tank, and the control method also includes: When the current oil level of the cooling device is greater than a preset oil level threshold, the solenoid valve is controlled to open.

17. The control method according to claim 16, characterized in that: The cooling device further includes an oil level indicator and a housing, wherein the oil level indicator is located inside the housing and mounted on the bottom of the housing, and the control method further includes: Determine whether the current oil level of the cooling device is greater than a preset oil level threshold value according to the detection result of the oil level indicator.

18. The control method according to claim 17, characterized in that: Determining the current oil level of the cooling device according to the detection result of the oil level indicator includes: After determining that the air conditioning equipment is started and has been running for a preset time, determining whether the current oil level of the cooling device is greater than a preset oil level threshold value according to the detection result of the oil level indicator.

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