Lubricating oil cooling and purifying device and method, heat pump unit and storage medium

Abstract

The invention discloses a lubricating oil cooling and purifying device and method, a heat pump unit and a storage medium. The lubricating oil cooling and purifying device comprises an air compressor, a vortex tube and a purifying tank, wherein a heat tube is arranged in the purifying tank; the vortex tube comprises an air inlet, a low-temperature air outlet and a high-temperature air outlet, the air inlet is connected to an outlet of the air compressor, the low-temperature air outlet is connected to the oil cooler, and the high-temperature air outlet is connected to a heat pipe inlet of the purification tank; the purification tank comprises a mixture inlet and an oil outlet, the mixture inlet is connected to the bottom of the evaporator, and the oil outlet is connected to the oil tank. The air compressor and the vortex tube are used as cold and heat sources, low-temperature air output by the vortex tube is used for cooling lubricating oil, the temperature of the low-temperature air is low, the cooling effect of the lubricating oil is improved, meanwhile, high-temperature air output by the vortex tube is used for heating and purifying a mixture, and purified oil is recycled into an oil tank; a heat pipe is arranged in the purification tank, so that the refrigerant in the mixture is fully evaporated, and the lubricating oil purification effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling and purifying compressor lubricating oil, and in particular to a lubricating oil cooling and purifying device, method, heat pump unit and storage medium. Background Art

[0002] For centrifugal heat pump unit systems, during the operation of their motor shafts and bearings, lubricating oil is used to lubricate the bearings and take away heat. In this process, on the one hand, the temperature of the lubricating oil continues to rise after lubrication, resulting in a decrease in kinematic viscosity, which cannot meet the bearing lubrication requirements and requires the lubricating oil to be cooled. On the other hand, the lubricating oil inevitably enters the refrigeration system through the gaps between the rotating parts of the compressor, causing the lubricating oil to leak into the refrigeration system and mix with the refrigerant to form a mixture of the lubricating oil and the refrigerant. The lubricating oil entering the refrigeration system needs to be purified and recovered.

[0003] like Figure 1 As shown, in the centrifugal heat pump unit system, the lubricating oil cooling scheme often used is: liquid refrigerant is taken from the bottom of the condenser 80, throttled by the cooling throttle valve 82 and enters the oil cooler 40, and heat is exchanged with the lubricating oil at the outlet of the oil pump 61. The refrigerant evaporates into a gaseous state and returns to the evaporator 50. After the lubricating oil is cooled, it passes through the oil filter 70 and enters the compressor high-level oil tank 71, and then enters the compressor bearing 72 through the internal oil circuit of the compressor to lubricate the compressor bearing 72. After taking away the heat of the bearing, the lubricating oil returns to the oil tank 60, and then is pressurized by the oil pump 61 to enter the next cycle. The frequently used lubricating oil purification and recovery scheme is: take high-pressure gaseous refrigerant from above the condenser 80, and inject the mixture of refrigerant and lubricating oil in the evaporator 50 into the oil tank 60 through the ejector 81. The refrigerant in the mixture of refrigerant and lubricating oil in the oil tank 60 evaporates into gas and returns to the evaporator 50 through the pipe at the top of the oil tank 60, while the lubricating oil does not evaporate due to the heat and is separated into the oil tank 60, thereby realizing the purification and recovery of the lubricating oil.

[0004] However, in the centrifugal heat pump system, especially the high-temperature heat pump unit, on the one hand, due to the high water temperature of the heat pump centrifugal condenser 80, the temperature of the liquid refrigerant in the condenser 80 is also high, which directly leads to the high temperature of the liquid refrigerant obtained from the bottom of the condenser 80 after throttling by the cooling throttle valve 82, and cannot effectively cool the lubricating oil, and it is difficult to achieve a more ideal cooling effect. The temperature of the refrigerant itself is even higher than the lubricating oil, and the lubricating oil cannot be cooled at all; on the other hand, in the oil return scheme of taking high-pressure gas from the condenser 80 to the evaporator 50 and injecting the refrigerant and oil mixture into the oil tank 60, the liquid refrigerant in the mixture only evaporates at the liquid surface of the oil tank. Due to the limitation of the oil tank volume, it cannot be fully evaporated, resulting in the low purity of the oil in the oil tank 60, the poor oil film lubrication effect, and the reduced bearing capacity of the bearing.

[0005] With regard to the problems in the prior art of poor cooling and purification effects of lubricating oil in heat pump units, no effective solution has been proposed yet. Summary of the invention

[0006] The embodiments of the present invention provide a lubricating oil cooling and purification device, method, heat pump unit and storage medium to at least solve the problem of poor cooling and purification effects of lubricating oil in the heat pump unit in the prior art.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides a lubricating oil cooling and purification device, comprising: an air compressor, a vortex tube and a purification tank, wherein a heat pipe is provided in the purification tank;

[0008] The vortex tube comprises an air inlet, a low-temperature air outlet and a high-temperature air outlet, the air inlet is connected to the outlet of the air compressor, the low-temperature air outlet is connected to the oil cooler, and the high-temperature air outlet is connected to the heat pipe inlet of the purification tank;

[0009] The purification tank includes a mixture inlet connected to the bottom of the evaporator and an oil drain port connected to the oil tank.

[0010] Optionally, the oil cooler comprises: an air pipeline and a lubricating oil pipeline;

[0011] The inlet of the air pipeline is connected to the low-temperature air outlet, and the outlet of the air pipeline is connected to the outside;

[0012] An inlet of the lubricating oil pipeline is connected to an oil pump, and an outlet of the lubricating oil pipeline is connected to an oil filter.

[0013] Optionally, a first valve with adjustable opening is provided on the connecting pipeline between the inlet of the air pipeline and the low-temperature air outlet; and a first oil temperature sensor is provided at the outlet of the lubricating oil pipeline.

[0014] Optionally, the purification tank further comprises a heat pipe outlet, and the heat pipe outlet is connected to the outside;

[0015] A second valve is provided on the connecting pipeline between the mixture inlet and the evaporator;

[0016] A third valve is arranged on the connecting pipeline between the oil discharge port and the oil tank.

[0017] Optionally, the purification tank further includes a refrigerant outlet located at the upper portion of the purification tank, and the refrigerant outlet is connected to the evaporator via a fourth valve. When a preset liquid level is reached in the purification tank, the fourth valve is opened to allow the separated gaseous refrigerant to return to the evaporator.

[0018] Optionally, the purification tank further comprises a gas inlet located at an upper portion of the purification tank, wherein the gas inlet is connected to a top portion of the condenser via a fifth valve, and oil discharge pressure is provided when the fifth valve is opened.

[0019] Optionally, the mixture inlet is located at the top of the purification tank, and the oil discharge port is located at the bottom of the purification tank.

[0020] Optionally, a heat exchanger is provided between the oil discharge port and the oil tank, and the heat exchanger is used to cool the purified lubricating oil;

[0021] The heat exchanger comprises a first pipeline and a second pipeline;

[0022] The inlet of the first pipeline is connected to the low-temperature gas outlet through a sixth valve with adjustable opening, and the outlet of the first pipeline is connected to the outside;

[0023] The inlet of the second pipeline is connected to the oil drain port, and the outlet of the second pipeline is connected to the oil tank;

[0024] A second oil temperature sensor is arranged at the outlet of the second pipeline.

[0025] The embodiment of the present invention further provides a lubricating oil cooling and purification method, which is applied to the lubricating oil cooling and purification device described in the embodiment of the present invention, and the method comprises:

[0026] Turn on the air compressor;

[0027] The lubricating oil at the outlet of the oil pump is cooled by the low-temperature air output by the vortex tube, and the flow rate of the low-temperature air entering the oil cooler from the vortex tube is controlled according to the outlet oil temperature of the oil cooler, so that the lubricating oil is within a preset temperature range;

[0028] The valve connected to the purification tank is controlled, and the mixture of the refrigerant and the lubricating oil drawn from the evaporator is heated and purified by using the high-temperature air output by the vortex tube in the purification tank, and the purified lubricating oil is recovered to the oil tank.

[0029] Optionally, controlling the low-temperature air flow rate entering the oil cooler from the vortex tube according to the outlet oil temperature of the oil cooler so as to keep the lubricating oil in a preset temperature range includes:

[0030] Obtaining the outlet oil temperature of the oil cooler;

[0031] If the outlet oil temperature of the oil cooler is lower than a first temperature threshold, reducing the opening of the first valve;

[0032] If the outlet oil temperature of the oil cooler is greater than a second temperature threshold, increasing the opening of the first valve;

[0033] If the outlet oil temperature of the oil cooler is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, maintaining the current opening of the first valve unchanged;

[0034] Wherein, the first valve is located on the connecting pipeline between the low-temperature air outlet of the vortex tube and the oil cooler.

[0035] Optionally, a valve connected to the purification tank is controlled, and the mixture of the refrigerant and the lubricating oil drawn from the evaporator is heated and purified by using the high-temperature air output by the vortex tube in the purification tank, and the purified lubricating oil is recovered to the oil tank, including:

[0036] Opening the second valve, and closing the third valve, the fourth valve, and the fifth valve, so as to utilize the high-temperature air to heat and purify the mixture;

[0037] When the recovery conditions are met, the third valve and the fifth valve are opened, and the second valve and the fourth valve are closed, so as to utilize the condenser to provide the oil discharge pressure to recover the purified lubricating oil to the oil tank;

[0038] Among them, the second valve is located on the connecting pipeline between the mixture inlet of the purification tank and the evaporator; the third valve is located on the connecting pipeline between the oil discharge port of the purification tank and the oil tank; the fourth valve is located on the connecting pipeline between the refrigerant outlet of the purification tank and the evaporator; the fifth valve is located on the connecting pipeline between the gas inlet of the purification tank and the condenser.

[0039] Optionally, before the third valve and the fifth valve are opened and the second valve and the fourth valve are closed to utilize the condenser to provide the oil discharge pressure so that the purified lubricating oil is recovered to the oil tank, the method further includes:

[0040] detecting the liquid level in the purification tank;

[0041] When the preset liquid level is reached, the fourth valve is opened, and the second valve, the third valve and the fifth valve are closed, so that the separated gaseous refrigerant returns to the evaporator;

[0042] When the refrigerant return operation is executed for a preset time, it is determined that the recovery condition is met.

[0043] Optionally, in the process of recovering the purified lubricating oil to the oil tank, the process further includes:

[0044] Get the outlet oil temperature of the heat exchanger;

[0045] If the outlet oil temperature of the heat exchanger is lower than the third temperature threshold, reducing the opening of the sixth valve;

[0046] If the outlet oil temperature of the heat exchanger is greater than a fourth temperature threshold, increasing the opening of the sixth valve;

[0047] If the outlet oil temperature of the heat exchanger is greater than or equal to the third temperature threshold and less than or equal to the fourth temperature threshold, the current opening of the sixth valve is kept unchanged;

[0048] Wherein, the heat exchanger is located between the oil discharge port of the purification tank and the oil tank, and the sixth valve is located on the connecting pipeline between the low-temperature air outlet of the vortex tube and the heat exchanger.

[0049] The embodiment of the present invention further provides a heat pump unit, comprising: the lubricating oil cooling and purification device described in the embodiment of the present invention.

[0050] The embodiment of the present invention further provides a non-volatile computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the lubricating oil cooling and purification method described in the embodiment of the present invention is implemented.

[0051] By applying the technical solution of the present invention, an air compressor and a vortex tube are used as cold and heat sources, and the low-temperature air output by the vortex tube is used to cool the lubricating oil at the outlet of the oil pump. The temperature of the low-temperature air is relatively low, which can improve the cooling effect of the lubricating oil. At the same time, the high-temperature air output by the vortex tube is used to heat the mixture of refrigerant and lubricating oil in the evaporator, so that the refrigerant in the mixture is evaporated and purified, and the purified lubricating oil is recovered to the oil tank. A heat pipe is arranged in the purification tank to circulate the high-temperature air, so that the liquid refrigerant in the mixture entering the purification tank is fully evaporated, thereby ensuring that the lubricating oil is fully purified and improving the purification effect of the lubricating oil. The problems of poor cooling and purification effects of the lubricating oil in the heat pump unit are solved, thereby ensuring the stable operation of the unit and improving the reliability of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of cooling, purifying and recovering lubricating oil of a heat pump unit in the prior art;

[0053] Figure 2 is a schematic diagram of a lubricating oil cooling and purification device according to an embodiment of the present invention;

[0054] Figure 3 is another schematic diagram of the lubricating oil cooling and purification device according to an embodiment of the present invention;

[0055] Figure 4 is a flow chart of a lubricating oil cooling and purification method provided by an embodiment of the present invention;

[0056] Figure 5 This is a flow chart of cooling, purifying and recovering lubricating oil provided by an embodiment of the present invention;

[0057] Description of reference numerals:

[0058] Air compressor 10, vortex tube 20, purification tank 30, oil cooler 40, evaporator 50, oil tank 60, oil pump 61, oil filter 70, compressor high-level oil tank 71, compressor bearing 72, condenser 80, heat exchanger 90, first valve 41, first oil temperature sensor 42, second valve 31, third valve 32, fourth valve 33, fifth valve 34, sixth valve 91, second oil temperature sensor 92. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0061] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0062] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0063] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0064] The embodiment of the present invention provides a lubricating oil cooling and purification device, which can improve the lubricating oil cooling effect and lubricating oil purification effect. Figure 2Schematic diagram of a lubricating oil cooling and purification device provided in an embodiment of the present invention, Figure 2 As shown, the lubricating oil cooling and purification device comprises: an air compressor 10, a vortex tube 20 and a purification tank 30, and a heat pipe is arranged in the purification tank 30.

[0065] The vortex tube 20 includes an air inlet, a low-temperature air outlet and a high-temperature air outlet. The air inlet is connected to the outlet of the air compressor 10 , the low-temperature air outlet is connected to the oil cooler 40 , and the high-temperature air outlet is connected to the heat pipe inlet of the purification tank 30 .

[0066] The purification tank 30 includes a mixture inlet connected to the bottom of the evaporator 50 and an oil discharge port connected to the oil tank 60 .

[0067] The air compressor 10 compresses air into air with a certain pressure. The vortex tube 20 is used to process the incoming air to output low-temperature air and high-temperature air. Specifically, the air compressor 10 compresses the air into air with a certain pressure, which enters the nozzle of the vortex tube 20 and expands and accelerates. The accelerated airflow enters the cylindrical vortex generator, and the rotating airflow enters the inside of the heat pipe along the wall of the heat pipe at a high speed. The airflow in the heat pipe produces energy separation after the vortex exchange, and the airflow is divided into two airflows, one is a hot airflow and the other is a cold airflow. At the terminal of the heat pipe, a part of the compressed air is discharged in the form of hot air through the regulating valve, and the remaining compressed air returns at a lower speed through the center of the rotating airflow entering the heat pipe. This cold airflow passes through the center of the generator to form ultra-low temperature cold air and gathers at the cold air end for discharge. The vortex tube 20 can generate airflow with a temperature from -40°C to 110°C, and has a good cooling and heating effect.

[0068] The low-temperature air output by the vortex tube 20 is used to cool the lubricating oil at the outlet of the oil pump. The temperature of the low-temperature air is relatively low, and the cooling effect of the lubricating oil can be ensured.

[0069] Through the mixture inlet, the mixture of the refrigerant and the lubricating oil in the evaporator 50 can be introduced into the purification tank 30, and the high-temperature air output by the vortex tube 20 is used to heat and purify the mixture. In the purification tank 30, the high-temperature air flows through the heat pipe, so that the temperature of the heat pipe is increased, and the mixture drips on the surface of the heat pipe. The refrigerant in the mixture is heated and evaporated into a gaseous state, and the separation and purification of the refrigerant and the lubricating oil are realized. Preferably, the mixture inlet is located at the top of the purification tank 30, so that the mixture drips from top to bottom, and is fully contacted with the heat pipe arranged in the purification tank 30, so as to improve the heat exchange effect of the mixture and the high-temperature air, and ensure the full purification of the lubricating oil. In the purification tank 30, more heat pipes (for example, covered with heat pipes) can be arranged to increase the heat exchange area, so as to more fully realize the separation of the refrigerant and the lubricating oil.

[0070] The high-temperature air flows through the heat pipes in the purification tank 30, causing the temperature of the heat pipes to rise sharply. In the evaporator 50, a mixture of refrigerant and lubricant is taken and passed into the top of the purification tank 30. After the mixture drips on the surface of the heat pipe and is heated, the refrigerant evaporates. Due to the large surface area and large number of heat pipes, the evaporation surface area of ​​the mixture of refrigerant and lubricant is significantly increased, thereby significantly improving the evaporation efficiency and fully realizing the separation of refrigerant and lubricant. Since the vortex tube can produce high-temperature compressed air of up to 110°C, which is much higher than the temperature of the liquid refrigerant in the condenser, the purification effect obtained by using the high-temperature compressed air generated by the vortex tube 20 as the purification heat source is much better than the purification effect of using the refrigerant in the condenser as the purification heat source.

[0071] The purified lubricating oil is accumulated in the purification tank 30 and can be recovered to the oil tank 60 through the oil drain port. Preferably, the oil drain port is located at the bottom of the purification tank 30 to facilitate the discharge of the purified lubricating oil.

[0072] The present embodiment uses an air compressor 10 and a vortex tube 20 as cold and heat sources, and the low-temperature air output by the vortex tube 20 is used to cool the lubricating oil at the outlet of the oil pump. The temperature of the low-temperature air is relatively low, which can improve the cooling effect of the lubricating oil. At the same time, the high-temperature air output by the vortex tube 20 is used to heat the mixture of refrigerant and lubricating oil in the evaporator 50, so that the refrigerant in the mixture is evaporated and purified, and the purified lubricating oil is recovered to the oil tank 60. A heat pipe is arranged in the purification tank 30 to circulate high-temperature air, so that the liquid refrigerant in the mixture entering the purification tank 30 is fully evaporated, ensuring that the lubricating oil is fully purified, improving the purification effect of the lubricating oil, solving the problem of poor cooling effect and poor purification effect of the lubricating oil in the heat pump unit, ensuring stable operation of the unit, and improving the reliability of the unit.

[0073] The oil cooler 40 includes an air pipeline and a lubricating oil pipeline. The inlet of the air pipeline is connected to the low-temperature air outlet, and the outlet of the air pipeline is connected to the outside. The inlet of the lubricating oil pipeline is connected to the oil pump 61, and the outlet of the lubricating oil pipeline is connected to the oil filter 70. In this embodiment, the low-temperature air generated by the vortex tube 20 is passed into the air pipeline of the oil cooler 40, and the oil pump 61 pressurizes the lubricating oil with a higher temperature in the oil tank 60 and passes it into the lubricating oil pipeline of the oil cooler 40. Through the heat exchange between the low-temperature air and the lubricating oil in the two pipelines, the low-temperature air cools the lubricating oil and is discharged into the ambient atmosphere. Since the temperature of the low-temperature air generated by the vortex tube 20 can be as low as -40°C, it can effectively cool the lubricating oil and ensure the cooling effect.

[0074] A first valve 41 with adjustable opening is arranged on the connecting pipeline between the inlet of the air pipeline and the low-temperature air outlet, and a first oil temperature sensor 42 is arranged at the outlet of the lubricating oil pipeline.

[0075] The opening of the first valve 41 is different, and the flow rate of low-temperature air entering the oil cooler 40 from the vortex tube 20 is different. The first oil temperature sensor 42 is used to detect the outlet oil temperature of the oil cooler 40. The opening of the first valve 41 can be controlled according to the outlet oil temperature of the oil cooler 40 to adjust the flow rate of low-temperature air entering the oil cooler 40 from the vortex tube 20, so that the lubricating oil is in a preset temperature range. Among them, the preset temperature range can be set to the oil temperature range corresponding to the best lubrication effect, for example, the preset temperature range is set to [30°C, 45°C]. Specifically, if the outlet oil temperature of the oil cooler 40 is in the preset temperature range, the current opening of the first valve 41 is maintained unchanged; if the outlet oil temperature of the oil cooler 40 is greater than the upper limit of the preset temperature range, the opening of the first valve 41 is increased; if the outlet oil temperature of the oil cooler 40 is less than the lower limit of the preset temperature range, the opening of the first valve 41 is reduced.

[0076] The present embodiment is provided with a first valve 41 and a first oil temperature sensor 42, and the opening of the first valve 41 can be adjusted according to the actual oil temperature to adjust the flow rate of low-temperature air entering the oil cooler 40, thereby accurately controlling the oil temperature and making the temperature of the lubricating oil entering the compressor high-level oil tank 71 controlled within a preset temperature range, at which time the oil film lubrication effect is best.

[0077] The purification tank 30 also includes a heat pipe outlet, which is connected to the outside. The high-temperature air generated by the vortex tube 20 flows through the heat pipe in the purification tank 30, heats and purifies the mixture, and then is discharged into the atmosphere. In this embodiment, through the heat pipe inlet and the heat pipe outlet, the high-temperature air can be discharged from the purification tank 30 in time and enter new high-temperature air for continued purification, thereby achieving continuous purification.

[0078] A second valve 31 is provided on the connecting pipeline between the mixture inlet and the evaporator 50. When the second valve 31 is opened, the mixture of the refrigerant and the lubricating oil in the evaporator 50 enters the purification tank 30. In this embodiment, the second valve 31 can control the mixture of the refrigerant and the lubricating oil in the evaporator 50 to enter the purification tank 30 for purifying the lubricating oil when oil return is required.

[0079] A third valve 32 is provided on the connecting pipeline between the oil discharge port and the oil tank 60. When the third valve 32 is opened, the purified lubricating oil accumulated in the purification tank 30 can be recovered to the oil tank 60. In this embodiment, the purified lubricating oil in the purification tank 30 can be recovered to the oil tank 60 through the third valve 32.

[0080] The purification tank 30 also includes a refrigerant outlet, which is located at the upper part of the purification tank 30. The refrigerant outlet is connected to the evaporator 50 through the fourth valve 33. When the preset liquid level is reached in the purification tank 30, the fourth valve 33 is opened to allow the separated gaseous refrigerant to return to the evaporator 50. Among them, the preset liquid level can be set according to the actual situation of the purification tank 30. When the preset liquid level is reached, it means that the separated lubricating oil in the purification tank 30 accumulates more. A liquid level gauge can be set in the purification tank 30 to detect the liquid level in the purification tank 30. In this embodiment, the fourth valve 33 can be used to allow the gaseous refrigerant obtained after separation to return to the evaporator 50 and continue to participate in the refrigerant cycle of the unit.

[0081] Considering that the gaseous refrigerant moves upward, preferably, the refrigerant outlet is located at the top of the purification tank 30 so that the gaseous refrigerant can return to the evaporator 50 smoothly and quickly.

[0082] The pressure of the components in the unit is from high to low: condenser > oil tank > purification tank > evaporator. When the unit is running, the compressor works on the low-pressure gaseous refrigerant in the evaporator to compress it into high-temperature and high-pressure gaseous refrigerant and discharge it into the condenser. The condenser is the component with the highest pressure in the refrigeration and heating cycle. The return of oil from the compressor to the oil tank is carried out through pressure difference. A balance pipe is usually set on the top of the oil tank and connected to the compressor suction port to reduce the internal pressure of the oil tank so that the oil in the compressor can return to the oil tank smoothly. Therefore, the condenser pressure is greater than the oil tank pressure.

[0083] The purification tank 30 further includes a gas inlet located at the upper portion of the purification tank 30, and the gas inlet is connected to the top of the condenser 80 through the fifth valve 34, and provides oil discharge pressure when the fifth valve 34 is opened. In this embodiment, high-pressure gas can be taken from the top of the condenser 80 to enter the purification tank 30 through the fifth valve 34. Since the pressure of the condenser 80 is higher than the pressure of the oil tank 60, the purified lubricating oil accumulated at the bottom of the purification tank 30 can be pressed back to the oil tank 60 to achieve the recovery of the lubricating oil.

[0084] Preferably, the gas inlet is located at the top of the purification tank 30 to ensure that the purified lubricating oil is better pressed back into the oil tank 60.

[0085] Considering that the temperature of the heat pipe in the purification tank 30 is very high, resulting in a very high temperature of the lubricating oil after purification, a heat exchanger can be set on the oil return pipe to cool the recovered lubricating oil, such as Figure 3 As shown, a heat exchanger 90 is arranged between the oil discharge port and the oil tank 60, and the heat exchanger 90 is used to cool down the purified lubricating oil. The heat exchanger 90 includes a first pipeline and a second pipeline. The inlet of the first pipeline is connected to the low-temperature air outlet through a sixth valve 91 with an adjustable opening, and the outlet of the first pipeline is connected to the outside. The inlet of the second pipeline is connected to the oil discharge port, and the outlet of the second pipeline is connected to the oil tank 60. A second oil temperature sensor 92 is arranged at the outlet of the second pipeline. The low-temperature air outlet and the two low-temperature air outlets separated therefrom can be connected by a three-way pipe.

[0086] The opening of the sixth valve 91 is different, and the flow rate of low-temperature air entering the heat exchanger 90 from the vortex tube 20 is different. The second oil temperature sensor 92 is used to detect the outlet oil temperature of the heat exchanger 90 (i.e., the oil temperature recovered to the oil tank 60). The opening of the sixth valve 91 can be controlled according to the outlet oil temperature of the heat exchanger 90 to adjust the flow rate of low-temperature air entering the heat exchanger 90 from the vortex tube 20, so that the lubricating oil is in a set temperature range. Among them, the set temperature range can be set according to actual conditions, and the set temperature range can be the same or different from the above-mentioned preset temperature range. Specifically, if the outlet oil temperature of the heat exchanger 90 is in the set temperature range, the current opening of the sixth valve 91 is kept unchanged, if the outlet oil temperature of the heat exchanger 90 is greater than the upper limit of the set temperature range, the opening of the sixth valve 91 is increased, and if the outlet oil temperature of the heat exchanger 90 is less than the lower limit of the set temperature range, the opening of the sixth valve 91 is reduced.

[0087] In this embodiment, a heat exchanger 90 is provided between the oil discharge port and the oil tank 60, and the lubricating oil recovered to the oil tank 60 is cooled by the low-temperature air generated by the vortex tube 20, so that the lubricating oil temperature is reduced before returning to the oil tank 60, thereby preventing the oil temperature of the oil tank from being too high, resulting in the oil temperature in the subsequent oil cooler 40 not being significantly reduced. By providing the sixth valve 91 and the second oil temperature sensor 92, the opening of the sixth valve 91 can be adjusted according to the actual oil temperature to adjust the flow rate of low-temperature air entering the heat exchanger 90, thereby accurately controlling the oil temperature.

[0088] The embodiment of the present invention further provides a lubricating oil cooling and purification method, which is applied to the lubricating oil cooling and purification device described in the above embodiment. Figure 4 Flow chart of the lubricating oil cooling and purification method provided by the embodiment of the present invention, such as Figure 4 As shown, the method comprises the following steps:

[0089] S401, start the air compressor 10.

[0090] S402, using the low-temperature air output by the vortex tube 20 to cool the lubricating oil at the outlet of the oil pump, and controlling the flow rate of low-temperature air entering the oil cooler 40 from the vortex tube 20 according to the outlet oil temperature of the oil cooler 40 to keep the lubricating oil in a preset temperature range.

[0091] S403, controlling the valve connected to the purification tank 30, heating and purifying the mixture of refrigerant and lubricating oil drawn from the evaporator 50 using the high-temperature air output by the vortex tube 20 in the purification tank 30, and recovering the purified lubricating oil to the oil tank 60.

[0092] The present embodiment uses an air compressor 10 and a vortex tube 20 as cold and heat sources, and the low-temperature air output by the vortex tube 20 is used to cool the lubricating oil at the outlet of the oil pump. The temperature of the low-temperature air is relatively low, which can improve the cooling effect of the lubricating oil. At the same time, the high-temperature air output by the vortex tube 20 is used to heat the mixture of refrigerant and lubricating oil in the evaporator 50, so that the refrigerant in the mixture is evaporated and purified, and the purified lubricating oil is recovered to the oil tank 60. A heat pipe is arranged in the purification tank 30 to circulate high-temperature air, so that the liquid refrigerant in the mixture entering the purification tank 30 is fully evaporated, ensuring that the lubricating oil is fully purified, improving the purification effect of the lubricating oil, solving the problem of poor cooling effect and poor purification effect of the lubricating oil in the heat pump unit, ensuring stable operation of the unit, and improving the reliability of the unit.

[0093] In one embodiment, the low-temperature air flow rate entering the oil cooler 40 from the vortex tube 20 is controlled according to the outlet oil temperature of the oil cooler 40 so that the lubricating oil is in a preset temperature range, including: obtaining the outlet oil temperature of the oil cooler 40; if the outlet oil temperature of the oil cooler 40 is less than the first temperature threshold, reducing the opening of the first valve 41; if the outlet oil temperature of the oil cooler 40 is greater than the second temperature threshold, increasing the opening of the first valve 41; if the outlet oil temperature of the oil cooler 40 is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, keeping the current opening of the first valve 41 unchanged. Wherein, the first valve 41 is located on the connecting pipeline between the low-temperature air outlet of the vortex tube 20 and the oil cooler 40. The outlet oil temperature of the oil cooler 40 can be obtained by the first oil temperature sensor 42.

[0094] This embodiment adjusts the opening of the first valve 41 according to the actual oil temperature to adjust the low-temperature air flow entering the oil cooler 40, thereby accurately controlling the oil temperature so that the temperature of the lubricating oil entering the compressor high-level oil tank 71 is controlled within a preset temperature range, at which time the oil film lubrication effect is best.

[0095] In one embodiment, the valve connected to the purification tank 30 is controlled, and the high-temperature air output by the vortex tube 20 is used in the purification tank 30 to heat and purify the mixture of refrigerant and lubricating oil drawn from the evaporator 50, and the purified lubricating oil is recovered to the oil tank 60, including: opening the second valve 31, closing the third valve 32, the fourth valve 33 and the fifth valve 34, so as to heat and purify the mixture by using the high-temperature air; when the recovery conditions are met, opening the third valve 32 and the fifth valve 34, closing the second valve 31 and the fourth valve 33, and using the condenser 80 to provide the oil discharge pressure to recover the purified lubricating oil to the oil tank 60.

[0096] Among them, the second valve 31 is located on the connecting pipeline between the mixture inlet of the purification tank 30 and the evaporator 50; the third valve 32 is located on the connecting pipeline between the oil discharge port of the purification tank 30 and the oil tank 60; the fourth valve 33 is located on the connecting pipeline between the refrigerant outlet of the purification tank 30 and the evaporator 50; the fifth valve 34 is located on the connecting pipeline between the gas inlet of the purification tank 30 and the condenser 80.

[0097] In this embodiment, by controlling the second valve 31, the third valve 32, the fourth valve 33 and the fifth valve 34 when oil return is required, the mixture of refrigerant and lubricating oil in the evaporator 50 can enter the purification tank 30, and the high-temperature air output by the vortex tube 20 is used to heat and purify the mixture to separate the refrigerant and the lubricating oil. A heat pipe is arranged in the purification tank 30 to circulate the high-temperature air so that the liquid refrigerant in the mixture entering the purification tank 30 is fully evaporated, thereby ensuring that the lubricating oil is fully purified and improving the purification effect of the lubricating oil; and high-pressure gas can be taken from the top of the condenser 80 to enter the purification tank 30. Since the pressure of the condenser 80 is higher than the pressure of the oil tank 60, the lubricating oil purified at the bottom of the purification tank 30 can be pressed back into the oil tank 60 to realize the recovery of the lubricating oil.

[0098] Furthermore, before the third valve 32 and the fifth valve 34 are opened, the second valve 31 and the fourth valve 33 are closed, and the purified lubricating oil is recovered to the oil tank 60 by using the condenser 80 to provide the oil discharge pressure, the process also includes: detecting the liquid level in the purification tank 30; when the preset liquid level is reached, the fourth valve 33 is opened, and the second valve 31, the third valve 32 and the fifth valve 34 are closed, so that the separated gaseous refrigerant returns to the evaporator 50; when the refrigerant return operation is executed for a preset time, it is determined that the recovery condition is met, and the operation of recovering the lubricating oil can be executed at this time (i.e., the third valve 32 and the fifth valve 34 are opened, and the second valve 31 and the fourth valve 33 are closed). Among them, the preset time can be set according to the actual situation, and the preset time ensures that the separated gaseous refrigerant can return to the evaporator 50.

[0099] In this embodiment, when the preset liquid level is reached in the purification tank 30, the fourth valve 33 is opened in time, so that the gaseous refrigerant obtained after separation returns to the evaporator 50 to continue to participate in the refrigerant cycle of the unit. Returning the refrigerant first and then recovering the lubricating oil can ensure that there is enough discharge pressure to press the lubricating oil back to the oil tank 60, avoiding the simultaneous return of refrigerant and recovery of lubricating oil, which causes the high-pressure gaseous refrigerant of the condenser 80 to directly return to the evaporator 50 with the lowest pressure after passing into the purification tank 30 and cannot provide discharge pressure, and also avoids the situation where the high-pressure refrigerant of the condenser 80 cannot enter the purification tank 30 and cannot provide discharge pressure due to the gaseous refrigerant filling the purification tank 30 after the refrigerant is returned.

[0100] In one embodiment, in the process of recovering the purified lubricating oil to the oil tank, it also includes: obtaining the outlet oil temperature of the heat exchanger 90; if the outlet oil temperature of the heat exchanger 90 is less than the third temperature threshold, reducing the opening of the sixth valve 91; if the outlet oil temperature of the heat exchanger 90 is greater than the fourth temperature threshold, increasing the opening of the sixth valve 91; if the outlet oil temperature of the heat exchanger 90 is greater than or equal to the third temperature threshold and less than or equal to the fourth temperature threshold, keeping the current opening of the sixth valve 91 unchanged. Wherein, the heat exchanger 90 is located between the oil discharge port of the purification tank 30 and the oil tank 60, and the sixth valve 91 is located on the connecting pipeline between the low-temperature outlet of the vortex tube 20 and the heat exchanger 90. The outlet oil temperature of the heat exchanger 90 can be obtained by the second oil temperature sensor 92.

[0101] In this embodiment, a heat exchanger 90 is arranged between the oil discharge port and the oil tank 60, and the low-temperature air generated by the vortex tube 20 is used to cool the lubricating oil recovered to the oil tank 60, so that the temperature of the lubricating oil is reduced before returning to the oil tank 60, thereby avoiding the lubricating oil temperature in the oil tank being too high, resulting in the oil temperature in the subsequent oil cooler 40 not being significantly reduced; and the opening of the sixth valve 91 can be adjusted according to the actual oil temperature to adjust the flow rate of low-temperature air entering the heat exchanger 90, thereby accurately controlling the oil temperature.

[0102] Combine the following Figure 5 The above lubricating oil cooling and purification scheme is described, however, it is worth noting that this specific embodiment is only for better illustrating the present application and does not constitute an improper limitation on the present application. The explanation of terms that are the same or corresponding to the above embodiment will not be repeated in this embodiment.

[0103] like Figure 5 As shown, it is a flow chart of lubricating oil cooling, purification and recovery, which includes the following steps:

[0104] S501, unit operation.

[0105] S502, start the air compressor 10, and the vortex tube 20 outputs low-temperature air and high-temperature air.

[0106] S503, the low-temperature air output by the vortex tube 20 is used to cool the lubricating oil, and the opening of the first valve 41 is controlled according to the outlet oil temperature of the oil cooler 40, so as to accurately control the oil temperature and ensure the best oil film lubrication effect.

[0107] S504, the high-temperature air output by the vortex tube 20 enters the purification tank 30, the second valve 31 is opened, and the third valve 32, the fourth valve 33 and the fifth valve 34 are closed, so that the mixture of refrigerant and lubricating oil in the evaporator 50 enters the purification tank 30 to purify the lubricating oil.

[0108] S505, when the liquid level in the purification tank 30 reaches the preset liquid level, that is, the liquid level is high and the separated lubricating oil accumulates more, the fourth valve 33 is opened, and the second valve 31, the third valve 32 and the fifth valve 34 are closed to allow the separated gaseous refrigerant to return to the evaporator 50.

[0109] S506, when the refrigerant return operation is executed for the preset time, the third valve 32 and the fifth valve 34 are opened, the second valve 31 and the fourth valve 33 are closed, and high-pressure gas is taken from the top of the condenser 80 into the purification tank 30. Since the pressure of the condenser 80 is higher than the pressure of the oil tank 60, the oil discharge pressure is provided, and the lubricating oil purified at the bottom of the purification tank 30 can be pressed back to the oil tank 60, thereby realizing the purification and recovery of the lubricating oil.

[0110] S507, during the recovery process, the low-temperature air output by the vortex tube 20 enters the heat exchanger 90, and the opening of the sixth valve 91 is controlled according to the outlet oil temperature of the heat exchanger 90, so that the lubricating oil temperature is reduced to a suitable temperature before being recovered to the oil tank 60, so as to avoid the lubricating oil temperature in the oil tank being too high, resulting in the oil temperature in the subsequent oil cooler 40 not being significantly reduced.

[0111] The lubricating oil cooling, purification and recovery scheme proposed in the embodiment of the present invention uses an air compressor 10 and a vortex tube 20 as cold and heat sources, and the low-temperature air output by the vortex tube 20 is used for cooling the oil at the oil pump outlet. At the same time, the high-temperature air output by the vortex tube 20 is used to heat the mixture of refrigerant and lubricating oil in the evaporator 50, so that the refrigerant evaporates and is purified, and the purified lubricating oil is cooled by a heat exchanger 90 and then recovered to the oil tank 60, thereby improving the cooling effect and purification effect of the lubricating oil, solving the problems of poor cooling effect and poor purification effect of the lubricating oil in the current heat pump unit, ensuring the stable operation of the unit, and improving the reliability of the unit.

[0112] The embodiment of the present invention further provides a heat pump unit, comprising: the lubricating oil cooling and purification device described in the above embodiment. The heat pump unit may be a centrifugal heat pump unit.

[0113] An embodiment of the present invention further provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the lubricating oil cooling and purification method described in the above embodiment is implemented.

[0114] An embodiment of the present invention further provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the lubricating oil cooling and purification method described in the above embodiment when executing the computer program.

[0115] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lubricating oil cooling and purification device, characterized in that: include: An air compressor, a vortex tube and a purification tank, wherein a heat pipe is provided in the purification tank; The vortex tube comprises an air inlet, a low-temperature air outlet and a high-temperature air outlet, the air inlet is connected to the outlet of the air compressor, the low-temperature air outlet is connected to the oil cooler, and the high-temperature air outlet is connected to the heat pipe inlet of the purification tank; The purification tank includes a mixture inlet connected to the bottom of the evaporator and an oil drain port connected to the oil tank.

2. The lubricating oil cooling and purification device according to claim 1, characterized in that: The oil cooler comprises: an air pipeline and a lubricating oil pipeline; The inlet of the air pipeline is connected to the low-temperature air outlet, and the outlet of the air pipeline is connected to the outside; An inlet of the lubricating oil pipeline is connected to an oil pump, and an outlet of the lubricating oil pipeline is connected to an oil filter.

3. The lubricating oil cooling and purification device according to claim 2, characterized in that: A first valve with adjustable opening is arranged on the connecting pipeline between the inlet of the air pipeline and the low-temperature air outlet; and a first oil temperature sensor is arranged at the outlet of the lubricating oil pipeline.

4. The lubricating oil cooling and purification device according to claim 1, characterized in that: The purification tank also includes a heat pipe outlet, and the heat pipe outlet is connected to the outside; A second valve is provided on the connecting pipeline between the mixture inlet and the evaporator; A third valve is arranged on the connecting pipeline between the oil discharge port and the oil tank.

5. The lubricating oil cooling and purification device according to claim 1, characterized in that: The purification tank also includes a refrigerant outlet located at the upper portion of the purification tank. The refrigerant outlet is connected to the evaporator via a fourth valve. When a preset liquid level is reached in the purification tank, the fourth valve is opened to allow the separated gaseous refrigerant to return to the evaporator.

6. The lubricating oil cooling and purification device according to claim 1, characterized in that: The purification tank further comprises a gas inlet located at the upper portion of the purification tank, wherein the gas inlet is connected to the top of the condenser via a fifth valve, and oil discharge pressure is provided when the fifth valve is opened.

7. The lubricating oil cooling and purification device according to claim 1, characterized in that: The mixture inlet is located at the top of the purification tank, and the oil discharge port is located at the bottom of the purification tank.

8. The lubricating oil cooling and purification device according to any one of claims 1 to 7, characterized in that: A heat exchanger is arranged between the oil discharge port and the oil tank, and the heat exchanger is used to cool down the purified lubricating oil; The heat exchanger comprises a first pipeline and a second pipeline; The inlet of the first pipeline is connected to the low-temperature gas outlet through a sixth valve with adjustable opening, and the outlet of the first pipeline is connected to the outside; The inlet of the second pipeline is connected to the oil drain port, and the outlet of the second pipeline is connected to the oil tank; A second oil temperature sensor is arranged at the outlet of the second pipeline.

9. A method for cooling and purifying lubricating oil, characterized in that: The lubricating oil cooling and purification device applied to any one of claims 1 to 8, the method comprising: Turn on the air compressor; The lubricating oil at the outlet of the oil pump is cooled by the low-temperature air output by the vortex tube, and the flow rate of the low-temperature air entering the oil cooler from the vortex tube is controlled according to the outlet oil temperature of the oil cooler, so that the lubricating oil is within a preset temperature range; The valve connected to the purification tank is controlled, and the mixture of the refrigerant and the lubricating oil drawn from the evaporator is heated and purified by using the high-temperature air output by the vortex tube in the purification tank, and the purified lubricating oil is recovered to the oil tank.

10. The method according to claim 9, characterized in that Controlling the low-temperature air flow rate entering the oil cooler from the vortex tube according to the outlet oil temperature of the oil cooler so as to keep the lubricating oil within a preset temperature range includes: Obtaining the outlet oil temperature of the oil cooler; If the outlet oil temperature of the oil cooler is lower than a first temperature threshold, reducing the opening of the first valve; If the outlet oil temperature of the oil cooler is greater than a second temperature threshold, increasing the opening of the first valve; If the outlet oil temperature of the oil cooler is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, maintaining the current opening of the first valve unchanged; Wherein, the first valve is located on the connecting pipeline between the low-temperature air outlet of the vortex tube and the oil cooler.

11. The method according to claim 9, characterized in that Controlling the valve connected to the purification tank, using the high-temperature air output by the vortex tube in the purification tank to heat and purify the mixture of refrigerant and lubricating oil drawn from the evaporator, and recovering the purified lubricating oil to the oil tank, including: Opening the second valve, and closing the third valve, the fourth valve, and the fifth valve, so as to utilize the high-temperature air to heat and purify the mixture; When the recovery conditions are met, the third valve and the fifth valve are opened, and the second valve and the fourth valve are closed, so as to utilize the condenser to provide the oil discharge pressure to recover the purified lubricating oil to the oil tank; Among them, the second valve is located on the connecting pipeline between the mixture inlet of the purification tank and the evaporator; the third valve is located on the connecting pipeline between the oil discharge port of the purification tank and the oil tank; the fourth valve is located on the connecting pipeline between the refrigerant outlet of the purification tank and the evaporator; the fifth valve is located on the connecting pipeline between the gas inlet of the purification tank and the condenser.

12. The method according to claim 11, characterized in that Before the third valve and the fifth valve are opened and the second valve and the fourth valve are closed to utilize the condenser to provide the oil discharge pressure so that the purified lubricating oil can be recovered to the oil tank, the method further includes: detecting the liquid level in the purification tank; When the preset liquid level is reached, the fourth valve is opened, and the second valve, the third valve and the fifth valve are closed, so that the separated gaseous refrigerant returns to the evaporator; When the refrigerant return operation is executed for a preset time, it is determined that the recovery condition is met.

13. The method according to any one of claims 9 to 12, characterized in that The process of recovering the purified lubricating oil to the oil tank also includes: Get the outlet oil temperature of the heat exchanger; If the outlet oil temperature of the heat exchanger is lower than the third temperature threshold, reducing the opening of the sixth valve; If the outlet oil temperature of the heat exchanger is greater than a fourth temperature threshold, increasing the opening of the sixth valve; If the outlet oil temperature of the heat exchanger is greater than or equal to the third temperature threshold and less than or equal to the fourth temperature threshold, the current opening of the sixth valve is kept unchanged; Wherein, the heat exchanger is located between the oil discharge port of the purification tank and the oil tank, and the sixth valve is located on the connecting pipeline between the low-temperature air outlet of the vortex tube and the heat exchanger.

14. A heat pump unit, characterized in that: include: The lubricating oil cooling and purification device according to any one of claims 1 to 8.

15. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the lubricating oil cooling and purification method according to any one of claims 9 to 13 is implemented.

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