Oil cooling system for a refrigeration system and refrigeration system

Abstract

The application provides an oil cooling system for a refrigeration system and the refrigeration system, and the oil cooling system comprises an evaporative condenser, an oil cooler, an oil heat exchange pipeline and a first heat exchange pipeline; the evaporative condenser comprises a box body, a second heat exchange pipeline and a spraying device, the second heat exchange pipeline and the spraying device are sequentially arranged in the box body along the height direction of the box body; the first heat exchange pipeline is arranged in the box body, the oil cooler is arranged outside the box body, the first heat exchange pipeline, the oil heat exchange pipeline and the oil cooler form a first refrigeration working medium cooling loop for cooling lubricating oil in the oil cooler; the second heat exchange pipeline, the compressor and the evaporator form a second refrigeration working medium cooling loop for cooling a heat source of the refrigeration system. The oil cooling system for the refrigeration system is independently arranged, which is beneficial to the installation of the oil heat exchange pipeline and the improvement of the cooling efficiency of the lubricating oil.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to an oil cooling system and a refrigeration system for use in refrigeration systems. Background Technology

[0002] The compressor is a crucial component of the refrigeration system. Lubricating oil inside the compressor plays a vital role in lubrication, sealing, and cooling, and is essential for the stable operation of the compressor. When the lubricating oil is heated, its temperature rises. The high-temperature lubricating oil carried in the compressor exhaust needs to be cooled and filtered before reuse. Cooling the lubricating oil is a critical aspect of compressor operation.

[0003] In refrigeration systems, the most commonly used oil cooling systems include water-cooled oil cooling systems, air-cooled oil cooling systems, and thermosiphon oil cooling systems. Water-cooled oil cooling systems require a separate cooling tower to cool the water and are often used in shipboard cold storage rooms. Air-cooled oil cooling systems have larger cooling equipment and are mostly used in refrigeration systems with smaller cooling capacities. Thermosiphon oil cooling systems are the most commonly used oil cooling method in refrigeration systems, but they have high installation requirements; the siphon tank, oil cooler, and evaporative condenser must meet a suitable height difference, the piping structure is complex, and the cooling efficiency is not good. Summary of the Invention

[0004] This invention provides an oil cooling system and a refrigeration system for use in a refrigeration system, in order to solve the problem of poor cooling efficiency in existing oil cooling systems.

[0005] In a first aspect, the present invention provides an oil cooling system for a refrigeration system, comprising: an evaporative condenser, an oil cooler, an oil heat exchange pipeline, and a first heat exchange tube;

[0006] The evaporative condenser includes a housing, a second heat exchange tube, and a spray device, wherein the second heat exchange tube and the spray device are arranged sequentially inside the housing along the height direction of the housing.

[0007] The first heat exchange tube is located inside the housing, and the oil cooler is located outside the housing. The first heat exchange tube, the oil heat exchange pipeline, and the oil cooler form a first refrigerant cooling circuit for cooling the lubricating oil inside the oil cooler.

[0008] The second heat exchange tube is used to connect to the compressor and the evaporator. The second heat exchange tube, the compressor and the evaporator form a second refrigerant cooling circuit for cooling the heat source of the refrigeration system.

[0009] According to the present invention, an oil cooling system for a refrigeration system is provided, wherein the oil heat exchange pipeline includes a first pipeline and a second pipeline;

[0010] One end of the first pipeline is connected to the outlet of the first heat exchange tube, and the other end is connected to the refrigerant inlet of the oil cooler; one end of the second pipeline is connected to the refrigerant outlet of the oil cooler, and the other end is connected to the inlet of the first heat exchange tube.

[0011] According to the present invention, an oil cooling system for a refrigeration system is provided, wherein the first pipeline includes a first section and a second section connected in sequence, and at least one of the first section and the second section is arranged in a vertical direction.

[0012] According to an oil cooling system for a refrigeration system provided by the present invention, the second pipeline includes a third section and a fourth section connected in sequence; at least one of the third section and the fourth section is arranged in a vertical direction.

[0013] According to the present invention, an oil cooling system for a refrigeration system is provided, wherein a fan is provided on the top of the housing, and a first heat exchange tube is provided between the fan and the spray device.

[0014] According to the present invention, an oil cooling system for a refrigeration system further includes a refrigerant pump, which is disposed on the oil heat exchange pipeline and is used to drive the flow of refrigerant in the first refrigerant cooling circuit.

[0015] According to an oil cooling system for a refrigeration system provided by the present invention, the first heat exchange tube is disposed below the spraying device, and the spraying device is capable of spraying cooling water onto the first heat exchange tube.

[0016] According to the present invention, an oil cooling system for a refrigeration system is provided, wherein the first heat exchange tube is disposed above the second heat exchange tube.

[0017] According to an oil cooling system for a refrigeration system provided by the present invention, the evaporative condenser further includes a water supply assembly;

[0018] The water supply assembly includes a water supply pipeline and a circulating water pump. One end of the water supply pipeline is connected to the bottom of the tank, and the other end of the water supply pipeline is connected to the top of the tank. The circulating water pump is located on the water supply pipeline.

[0019] Secondly, the present invention provides a refrigeration system, including the oil cooling system for the refrigeration system described above.

[0020] The present invention provides an oil cooling system and a refrigeration system for a refrigeration system. A first heat exchange tube and a second heat exchange tube are disposed within a housing. The first heat exchange tube, the oil heat exchange pipeline, and the oil cooler form a first refrigerant cooling circuit. The first refrigerant circulates in the first refrigerant cooling circuit to cool the lubricating oil. The second heat exchange tube, the compressor, and the evaporator form a second refrigerant cooling circuit. The second refrigerant circulates in the second refrigerant cooling circuit to cool the heat source of the refrigeration system. The oil cooling system is independently configured, which facilitates the installation of the oil heat exchange pipeline and improves the cooling efficiency of the lubricating oil. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is one of the structural schematic diagrams of an oil cooling system for a refrigeration system provided by the present invention;

[0023] Figure 2 This is the second schematic diagram of the structure of the oil cooling system for refrigeration systems provided by the present invention;

[0024] Figure 3 This is the third schematic diagram of the structure of the oil cooling system for refrigeration systems provided by the present invention;

[0025] Reference numerals in the attached drawings: 1: Evaporative condenser; 101: Housing; 102: Second heat exchange tube; 1021: Inlet of the second heat exchange tube; 1022: Outlet of the second heat exchange tube; 103: Spray device; 104: Water storage tank; 105: Fan; 106: Water supply pipeline; 107: Circulating water pump; 2: Oil cooler; 3: First pipeline; 4: Second pipeline; 5: First heat exchange tube; 501: Inlet of the first heat exchange tube; 502: Outlet of the first heat exchange tube; 6: Refrigerant pump. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] The following is combined with Figures 1 to 3 This invention describes an oil cooling system for a refrigeration system according to an embodiment of the present invention.

[0029] like Figure 1 As shown, the oil cooling system for a refrigeration system provided in this embodiment of the invention includes: an evaporative condenser 1, an oil cooler 2, an oil heat exchange pipeline, and a first heat exchange tube 5; the evaporative condenser 1 includes a housing 101, a second heat exchange tube 102, and a spray device 103, the second heat exchange tube 102 and the spray device 103 being arranged sequentially inside the housing 101 along the height direction of the housing 101; the first heat exchange tube 5 is located inside the housing 101, and the oil cooler 2 is located outside the housing 101, the first heat exchange tube 5, the oil heat exchange pipeline, and the oil cooler 2 forming a first refrigerant cooling circuit for cooling the lubricating oil inside the oil cooler 2; the second heat exchange tube 102 is used to connect to the compressor and the evaporator, the second heat exchange tube 102, the compressor, and the evaporator forming a second refrigerant cooling circuit for cooling the heat source of the refrigeration system.

[0030] Specifically, the evaporative condenser 1 includes a housing 101, a second heat exchange tube 102, and a spray device 103. The second heat exchange tube 102 and the spray device 103 are arranged sequentially along the height of the housing 101 inside the housing 101. The top of the housing 101 is open, and a fan 105, which can be an axial flow fan, is installed on the top of the housing 101. The spray device 103 is connected to a water supply pipe 106, which supplies cooling water to the spray device 103, which sprays cooling water onto the second heat exchange tube 102. A water storage tank 104 is provided at the bottom of the housing 101 for storing cooling water.

[0031] The oil cooler 2 is located outside the housing 101 and spaced apart from it. There is a height difference between the oil cooler 2 and the first heat exchange tube 5, with the oil cooler 2 positioned vertically below the first heat exchange tube 5. The oil cooler 2 has a refrigerant inlet, a refrigerant outlet, an oil inlet, and an oil outlet. Inside the oil cooler 2 is a refrigerant pipeline with a refrigerant inlet and outlet at both ends. The refrigerant filling the pipeline is either a refrigerant or a heat transfer fluid. When the refrigerant is a refrigerant, this refrigerant is defined as the first refrigerant.

[0032] The structure of the oil heat exchange pipeline is not specifically limited. For example, the oil heat exchange pipeline includes a first pipeline 3 and a second pipeline 4 arranged at intervals. The first heat exchange tube 5 is located inside the housing 101. One end of the first pipeline 3 is connected to the outlet 502 of the first heat exchange tube, and the other end of the first pipeline 3 is connected to the refrigerant inlet of the oil cooler 2. One end of the second pipeline 4 is connected to the refrigerant outlet of the oil cooler 2, and the other end of the second pipeline 4 is connected to the inlet 501 of the first heat exchange tube. Thus, a first refrigerant cooling circuit is formed between the first heat exchange tube 5, the first pipeline 3, the oil cooler 2, and the second pipeline 4. The first refrigerant circulates within the first refrigerant cooling circuit, which can cool the lubricating oil in the oil cooler 2.

[0033] The compressor's oil circuit is connected to the oil cooler 2. One port of the oil circuit is connected to the oil inlet of the oil cooler 2, and the other port of the oil circuit is connected to the oil outlet of the oil cooler 2. The lubricating oil in the oil circuit flows into the oil cooler 2 through the oil inlet. The high-temperature lubricating oil in the oil cooler 2 can exchange heat with the first refrigerant in the refrigerant pipeline, and the high-temperature lubricating oil is cooled and its temperature decreases.

[0034] The inlet 1021 of the second heat exchange tube is connected to the exhaust port of the compressor, and the outlet 1022 of the second heat exchange tube is connected to the evaporator. The evaporator is connected to the inlet of the compressor. Thus, a second refrigerant cooling circuit is formed between the second heat exchange tube 102, the evaporator, and the compressor. The second refrigerant circulates within the second refrigerant cooling circuit, absorbing heat from the heat source of the refrigeration system to achieve a cooling effect.

[0035] The following is a detailed description of the operation of the oil cooling system. Cooling water in the water storage tank 104 is pumped to the spray device 103 via the circulating water pump 107 along the water supply pipeline 106. The spray device 103 has multiple nozzles, through which the cooling water is sprayed onto the surface of the second heat exchange tube 102, forming a thin water film. The rotation of the fan 105 causes the air entering the housing 101 to move vertically upwards, and the water film on the surface of the second heat exchange tube 102 evaporates under the action of the rapidly flowing air. The compressor discharges a high-temperature, high-pressure gaseous second refrigerant. The gaseous second refrigerant enters the second heat exchange tube 102 through the inlet 1021. The gaseous second refrigerant cools down and condenses into a liquid second refrigerant due to water film evaporation and rapid air flow. The liquid second refrigerant flows out through the outlet 1022 of the second heat exchange tube. After passing through the expansion valve, the liquid second refrigerant flows into the evaporator. The evaporator absorbs heat from the heat source of the refrigeration system, realizing the transformation of the second refrigerant between the liquid and gaseous states, and achieving the cooling effect on the heat source of the refrigeration system.

[0036] The high-temperature lubricating oil discharged from the compressor is separated by an oil separator and flows into the oil cooler 2 through the oil inlet. The liquid refrigerant in the oil cooler 2 exchanges heat with the high-temperature lubricating oil, cooling the oil and lowering its temperature. Part of the liquid refrigerant absorbs heat from the lubricating oil and transforms into a gaseous state. Liquid refrigerant flows in the first pipe 3, while a gas-liquid mixture flows in the second pipe 4. The pure liquid refrigerant in the first pipe 3 and the gas-liquid mixture in the second pipe 4 have a density difference. Due to this density difference, the gaseous refrigerant in the oil cooler 2 flows along the second pipe 4 into the first heat exchange tube 5. The gaseous refrigerant exchanges heat with the rapidly flowing air outside the first heat exchange tube 5, transforming into a liquid refrigerant. The liquid refrigerant flows through the outlet 502 of the first heat exchange tube and flows into the oil cooler 2 under gravity. Thus, the cooling of the lubricating oil is achieved through the conversion of the refrigerant between liquid and gaseous states.

[0037] In this embodiment of the invention, the first heat exchange tube 5 and the second heat exchange tube 102 are disposed inside the housing 101. The first heat exchange tube 5, the oil heat exchange pipeline and the oil cooler 2 form a first refrigerant cooling circuit. The first refrigerant circulates in the first refrigerant cooling circuit to cool the lubricating oil. The second heat exchange tube 102, the compressor and the evaporator form a second refrigerant cooling circuit. The second refrigerant circulates in the second refrigerant cooling circuit to cool the heat source of the refrigeration system. The oil cooling system is set up independently, which is beneficial for the installation of the oil heat exchange pipeline and also helps to improve the cooling efficiency of the lubricating oil.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, in an optional embodiment, the oil heat exchange pipeline includes a first pipeline 3 and a second pipeline 4; one end of the first pipeline 3 is connected to the outlet 502 of the first heat exchange tube, and the other end is connected to the refrigerant inlet of the oil cooler 2; one end of the second pipeline 4 is connected to the refrigerant outlet of the oil cooler 2, and the other end is connected to the inlet 501 of the first heat exchange tube.

[0039] Specifically, the first heat exchange tube 5 is located inside the housing 101. One end of the first pipe 3 is connected to the outlet 502 of the first heat exchange tube, and the other end of the first pipe 3 is connected to the refrigerant inlet of the oil cooler 2. One end of the second pipe 4 is connected to the refrigerant outlet of the oil cooler 2, and the other end of the second pipe 4 is connected to the inlet 501 of the first heat exchange tube. Thus, the first heat exchange tube 5, the first pipe 3, the oil cooler 2, and the second pipe 4 form a first refrigerant cooling circuit.

[0040] The first pipe 3 and the second pipe 4 are arranged alternately, so that a suitable height difference is formed between the first heat exchange tube 5 and the oil cooler 2. The pipe structure is simple and conducive to the compactness and integration of the oil cooling system structure.

[0041] In an optional embodiment, the first pipeline 3 includes a first section and a second section connected in sequence, at least one of the first section and the second section being arranged in a vertical direction.

[0042] Specifically, the first section can be horizontally arranged, and the second section can be vertically arranged. One end of the first section is connected to the outlet 502 of the first heat exchange tube, and the other end of the first section is connected to one end of the second section. The other end of the second section is connected to the refrigerant inlet of the oil cooler 2. The vertical arrangement of the second section facilitates the smooth flow of the liquid first refrigerant to the oil cooler 2 under the action of gravity.

[0043] Furthermore, one end of the first section is detachably connected to the outlet 502 of the first heat exchange tube, the other end of the first section is detachably connected to one end of the second section, and the other end of the second section is detachably connected to the refrigerant inlet of the oil cooler 2. This detachable connection facilitates installation and disassembly, and makes maintenance easier.

[0044] In an optional embodiment, the second conduit 4 includes a third section and a fourth section connected in sequence; at least one of the third section and the fourth section is arranged in a vertical direction.

[0045] Specifically, the third section can be set horizontally, the fourth section can be set vertically, one end of the third section is connected to the inlet 501 of the first heat exchange tube, the other end of the third section is connected to one end of the second section, and the other end of the second section is connected to the refrigerant outlet of the oil cooler 2.

[0046] Furthermore, one end of the third section is detachably connected to the inlet 501 of the first heat exchange tube, the other end of the third section is detachably connected to one end of the fourth section, and the other end of the fourth section is detachably connected to the refrigerant outlet of the oil cooler 2. This detachable connection facilitates installation and disassembly, and makes maintenance easier.

[0047] Furthermore, the first heat exchange tube 5 is serpentine in shape and runs vertically, with its outlet 502 located below its inlet 501, and the first section located below the third section. This vertical arrangement of the second and fourth sections facilitates a more compact piping system.

[0048] Furthermore, the diameter of the second pipe 4 is larger than that of the first pipe 3. The larger diameter of the second pipe 4 facilitates the smooth flow of the gaseous first refrigerant, while the smaller diameter of the first pipe 3 is sufficient to ensure the smooth flow of the liquid first refrigerant.

[0049] like Figure 1 As shown, in an optional embodiment, a fan 105 is provided on the top of the housing 101, and a first heat exchange pipe 5 is provided between the fan 105 and the spray device 103.

[0050] Specifically, a fan is installed on the top of the housing 101, and the number of fans is set according to actual needs. The first heat exchange tube 5 is installed above the spray device 103 and below the fan 105. There is a height difference between the oil cooler 2 and the first heat exchange tube 5, and the value of the height difference is set according to actual needs. The first heat exchange tube 5 is located above the spray device 103, and the second heat exchange tube 102 is located below the spray device 103.

[0051] The following describes the working process of an air-cooled oil cooling system. The first refrigerant flowing in the first refrigerant cooling circuit is Freon or ammonia, etc., and the second refrigerant flowing in the second refrigerant cooling circuit is Freon or ammonia, etc. The circulating water pump 107 draws cooling water from the water storage tank 104. The cooling water is pressurized and transported to the spray device 103. The cooling water is sprayed through nozzles onto the surface of the second heat exchange tube 102 to form a water film. The fan 105 rotates to accelerate the airflow inside the housing 101. The water film evaporates under the action of the rapidly flowing air, absorbing heat during the evaporation process. The high-temperature, high-pressure gaseous second refrigerant discharged from the compressor enters the second heat exchange tube 102 through the inlet 1021. The gaseous second refrigerant cools down and condenses into a liquid second refrigerant due to the evaporation of the external water film and the rapid flow of air. The liquid second refrigerant flows out through the outlet 1022 of the second heat exchange tube. After passing through the expansion valve, the liquid second refrigerant flows into the evaporator, realizing the transformation of the second refrigerant between the liquid and gaseous states, thereby achieving the cooling effect on the heat source of the refrigeration system.

[0052] The high-temperature lubricating oil carried by the compressor exhaust flows into the oil cooler 2 through the oil inlet. The liquid first refrigerant in the oil cooler 2 exchanges heat with the high-temperature lubricating oil in the oil cooler 2. The liquid first refrigerant evaporates and turns into gaseous first refrigerant. The evaporation process absorbs heat from the lubricating oil, and the lubricating oil is cooled and its temperature decreases. The low-temperature lubricating oil flows back into the compressor through the oil outlet of the oil cooler 2. The first pipe 3 carries a liquid refrigerant, while the second pipe 4 carries a gas-liquid mixture of refrigerants. Specifically, the lower half of the vertical section of the second pipe 4 carries the gas-liquid mixture, while the upper half of the vertical section and the horizontal section carry the gaseous refrigerant. The pure liquid refrigerant in the first pipe 3 and the gas-liquid mixture in the second pipe 4 have a density difference. Due to this density difference, the gaseous refrigerant in the oil cooler 2 flows along the second pipe 4 and enters the first heat exchange tube 5 through the inlet 501. The gaseous refrigerant flowing into the first heat exchange tube 5 exchanges heat with the rapidly flowing air outside the tube and condenses into a liquid refrigerant. This liquid refrigerant then flows through the outlet 502 of the first heat exchange tube and, under gravity, flows along the first pipe 3 into the oil cooler 2, thus achieving circulating cooling of the lubricating oil.

[0053] In this embodiment of the invention, there is a height difference between the first heat exchange tube 5 and the oil cooler 2. A circulation loop for the first refrigerant is constructed through the first heat exchange tube 5, the first pipeline 3, the oil cooler 2, and the second pipeline 4. This eliminates the need for a separate siphon tank, reducing the height requirement between the evaporative condenser 1 and the oil cooler 2 compared to traditional siphon oil cooling systems. It also simplifies the system piping, promoting a more compact and integrated overall structure. Based on the thermosiphon principle, the first refrigerant circulates within the first refrigerant cooling loop without the need for a drive pump or external mechanical input. The first and second refrigerant cooling loops are independent, and changes in the lubricating oil cooling load do not affect the high-pressure liquid supply flow regulation of the refrigeration system, ensuring a stable high-pressure liquid supply flow. Furthermore, the first refrigerant flowing in the first refrigerant cooling loop can use different types of Freon, avoiding the use of ammonia, the same refrigerant as the second refrigerant. This helps reduce the ammonia charge in the entire refrigeration system, meeting the relevant ammonia charge requirements and achieving ammonia reduction.

[0054] like Figure 2 As shown, in an optional embodiment, the oil cooling system further includes a refrigerant pump 6, which is located on the oil heat exchange pipeline and is used to drive the flow of refrigerant in the first refrigerant cooling circuit.

[0055] Specifically, a refrigerant pump 6 is installed on the first pipeline 3. The oil cooler 2, the first pipeline 3, the second pipeline 4, the refrigerant pump 6, and the first heat exchange tube 5 constitute the first refrigerant cooling circuit. The first refrigerant flowing in the first refrigerant cooling circuit is a refrigerant, which can be water, brine, or other alcohol solutions. An example using an ethylene glycol solution as the refrigerant will be provided.

[0056] The following describes the workflow of another air-cooled oil-cooled system. The circulating water pump 107 draws cooling water from the water storage tank 104. The cooling water is pressurized and transported to the spray device 103. The cooling water is sprayed through nozzles onto the surface of the second heat exchange tube 102, forming a water film. The fan rotation accelerates the airflow inside the housing 101, and the water film evaporates under the action of the rapidly flowing air, absorbing heat during the evaporation process. The high-temperature, high-pressure gaseous second refrigerant discharged from the compressor enters the second heat exchange tube 102 through the inlet 1021. The gaseous second refrigerant cools and condenses into a liquid state under the action of water film evaporation and rapid airflow, flowing out through the outlet 1022 of the second heat exchange tube. The liquid second refrigerant flows through the expansion valve and into the evaporator, realizing the conversion of the second refrigerant between liquid and gaseous states, achieving the cooling effect on the heat source of the refrigeration system.

[0057] The high-temperature lubricating oil carried by the compressor exhaust flows into the oil cooler 2 through the oil inlet. The ethylene glycol solution in the oil cooler 2 exchanges heat with the high-temperature lubricating oil. The refrigerant pump 6 drives the heat-exchanged high-temperature ethylene glycol solution to flow along the second pipeline 4, entering the first heat exchange tube 5 through the inlet 501. The high-temperature ethylene glycol solution in the first heat exchange tube 5 exchanges heat with the rapidly flowing air outside the first heat exchange tube 5, transforming into a low-temperature ethylene glycol solution. Driven by the refrigerant pump 6, the low-temperature ethylene glycol solution flows out from the outlet 502 of the first heat exchange tube, entering the oil cooler 2 along the first pipeline 3. The circulating flow of the ethylene glycol solution cools the lubricating oil.

[0058] A refrigerant circulation loop is constructed via the first heat exchange tube 5, the third pipeline, the refrigerant pump 6, the first pipeline 3, the oil cooler 2, and the second pipeline 4. This eliminates the need for a siphon tank, reducing the installation height requirement between the evaporative condenser 1 and the oil cooler 2 compared to traditional siphon oil cooling systems. It also simplifies the system piping, promoting a more compact and integrated overall structure. The first and second refrigerant cooling loops are independent, ensuring that changes in the lubricating oil cooling load do not affect the high-pressure liquid supply flow regulation of the refrigeration system. Furthermore, the first refrigerant flowing in the first refrigerant cooling loop is not ammonia, avoiding the use of the same refrigerant as the second refrigerant. This helps reduce the overall ammonia charge in the refrigeration system, ensuring it meets the required ammonia charge and achieving ammonia reduction.

[0059] The refrigerant can be water, brine, or other alcohol solutions. Refrigerants are readily available and easy to fill into the refrigerant piping of the oil cooler 2. The refrigerant filling of the oil cooler 2 can be completed in the manufacturing workshop; only piping connection is required at the installation site. This facilitates standardized production and convenient maintenance in the later stages of use.

[0060] like Figure 3 As shown, in an optional embodiment, the first heat exchange tube 5 is located below the spray device 103, and the spray device 103 can spray cooling water onto the first heat exchange tube 5.

[0061] Specifically, the first heat exchange tube 5 and the second heat exchange tube 102 are both installed below the spray device 103, and there is a height difference between the oil cooler 2 and the first heat exchange tube 5. The first heat exchange tube 5 can be arranged parallel to the second heat exchange tube 102; the first heat exchange tube 5 can also be located above the second heat exchange tube 102 and below the spray device 103.

[0062] The first heat exchange tube 5, the first pipeline 3, the oil cooler 2, and the second pipeline 4 constitute the first refrigerant cooling circuit. The first refrigerant flowing in the first refrigerant cooling circuit is Freon or ammonia, etc.

[0063] The following describes the working process of the evaporative cooling oil cooling system. The circulating water pump 107 draws cooling water from the water storage tank 104. The cooling water is pressurized and transported to the spray device 103. The cooling water is sprayed through nozzles onto the surface of the first heat exchange tube 5 and the surface of the second heat exchange tube 102 to form a water film. The fan 105 rotates to accelerate the airflow inside the housing 101.

[0064] The water film on the surface of the second heat exchange tube 102 evaporates under the action of rapidly flowing air, absorbing heat during the evaporation process. The high-temperature, high-pressure gaseous second refrigerant discharged from the compressor enters the second heat exchange tube 102 through the inlet 1021. The gaseous second refrigerant cools down and condenses into a liquid second refrigerant under the action of external water film evaporation and rapid air flow, and flows out through the outlet 1022 of the second heat exchange tube. The liquid second refrigerant flows through the expansion valve and then into the evaporator, realizing the transformation of the second refrigerant between liquid and gaseous states, achieving the cooling effect on the heat source of the refrigeration system.

[0065] The high-temperature lubricating oil carried by the compressor exhaust flows into the oil cooler 2 through the oil inlet. The liquid first refrigerant in the oil cooler 2 exchanges heat with the high-temperature lubricating oil, causing the liquid first refrigerant to evaporate and transform into a gaseous state. This evaporation process absorbs heat from the lubricating oil, cooling it and lowering its temperature. The low-temperature lubricating oil then flows back into the compressor through the oil outlet of the oil cooler 2. The first pipeline 3 carries liquid first refrigerant, while the second pipeline 4 carries a gas-liquid mixture of first refrigerant. The pure liquid first refrigerant in the first pipeline 3 and the gas-liquid mixture in the second pipeline 4 have a density difference. Under the influence of this density difference, the gaseous first refrigerant in the oil cooler 2 flows along the second pipeline 4 and enters the first heat exchange tube 5 through the inlet 501. The gaseous first refrigerant flowing into the first heat exchange tube 5 evaporates and condenses into a liquid first refrigerant after exchanging heat with the rapidly flowing air and water film outside the first heat exchange tube 5. The liquid first refrigerant flows through the outlet 502 of the first heat exchange tube and then flows into the oil cooler 2 along the first pipeline 3 under the action of gravity, thereby realizing the circulating cooling of the lubricating oil.

[0066] There is a height difference between the first heat exchange tube 5 and the oil cooler 2. A circulation loop for the first refrigerant is constructed through the first heat exchange tube 5, the first pipeline 3, the oil cooler 2, and the second pipeline 4. This eliminates the need for a siphon tank, reducing the height requirement between the evaporative condenser 1 and the oil cooler 2 compared to traditional siphon oil cooling systems. It also simplifies the system piping, contributing to a more compact and simpler overall structure. Based on the thermosiphon principle, the first refrigerant circulates within the first refrigerant cooling loop without the need for a drive pump or external mechanical input. The first and second refrigerant cooling loops are independent, and changes in the lubricating oil cooling load do not affect the high-pressure liquid supply flow regulation of the refrigeration system. Furthermore, the first refrigerant flowing within the first refrigerant cooling loop can use different types of Freon, avoiding the use of ammonia, the same refrigerant as the second refrigerant. This helps reduce the overall ammonia charge in the refrigeration system, ensuring it meets the relevant ammonia charge requirements and achieving ammonia reduction.

[0067] like Figure 3 As shown, in an optional embodiment, the first heat exchange tube 5 is disposed above the second heat exchange tube 102.

[0068] Specifically, the first heat exchange tube 5 is located above the second heat exchange tube 102, which is beneficial to the overall layout of the system, to creating a height difference between the first heat exchange tube 5 and the oil cooler 2, and to facilitating the smooth flow of the first refrigerant in the first refrigerant cooling circuit.

[0069] like Figure 1 , Figure 2 and Figure 3As shown, in an optional embodiment, the evaporative condenser 1 further includes a water supply assembly; the water supply assembly includes a water supply pipe 106 and a circulating water pump 107, one end of the water supply pipe 106 is connected to the bottom of the housing 101, the other end of the water supply pipe 106 is connected to the top of the housing 101, and the circulating water pump 107 is mounted on the water supply pipe 106.

[0070] Specifically, the water supply assembly includes a water supply pipeline 106 and a circulating water pump 107. The water supply pipeline 106 includes a supply pipe and a return pipe, and the circulating water pump 107 is installed between the supply pipe and the return pipe. The circulating water pump 107 is spaced apart from the bottom of the housing 101. One end of the return pipe is connected to the water storage tank 104 inside the housing 101, and the other end is connected to the inlet of the circulating water pump 107. One end of the supply pipe is connected to the outlet of the circulating water pump 107, and the other end is connected to the spray device 103. The circulating water pump 107 pumps the cooling water in the water storage tank 104 along the return pipe and the supply pipe to the spray device 103, realizing the circulation of cooling water and spraying the first heat exchange tube 5 and the second heat exchange tube 102.

[0071] The spray device 103 includes multiple nozzles, which are spaced apart. These nozzles can be spaced apart along the length of the housing 101, along the width of the housing 101, or simultaneously along both the length and width of the housing 101. The multiple nozzles improve the uniformity of the spray, which in turn facilitates the formation of water films on the surfaces of the first heat exchange tube 5 and the second heat exchange tube 102. This helps ensure the condensation efficiency of the first refrigerant in the first heat exchange tube 5 and the second refrigerant in the second heat exchange tube 102, thereby contributing to the stable operation of the refrigeration system.

[0072] This invention also provides a refrigeration system, which includes the oil cooling system described above.

[0073] The evaporative condenser 1 includes a housing 101, a second heat exchange tube 102, a spray device 103, and a water supply assembly. A fan 105 is installed on the top of the housing 101, and a water storage tank 104 is located at the bottom of the housing 101. The second heat exchange tube 102 and the first heat exchange tube 5 are both located inside the housing 101. The first heat exchange tube 5, the oil heat exchange pipeline, and the oil cooler 2 form a first refrigerant cooling circuit. The first refrigerant can be a refrigerant or a heat transfer fluid. The first refrigerant circulates in the first refrigerant cooling circuit to cool the lubricating oil. The second heat exchange tube 102, the compressor, and the evaporator form a second refrigerant cooling circuit. The second refrigerant circulates in the second refrigerant cooling circuit to cool the heat source of the refrigeration system. The first and second refrigerant cooling circuits are set up independently, which is beneficial to improving the cooling efficiency of the lubricating oil.

[0074] There is a height difference between the first heat exchange tube 5 and the oil cooler 2. The first refrigerant circulation loop is constructed through the first heat exchange tube 5, the first pipeline 3, the oil cooler 2 and the second pipeline 4. There is no need to set up a siphon tank. Compared with the traditional siphon oil cooling system, the installation height requirement between the evaporative condenser 1 and the oil cooler 2 is reduced. At the same time, the system piping is simplified, which is conducive to the compactness and simplification of the overall structure.

[0075] The first refrigerant circulates within the first refrigerant cooling circuit, requiring no drive pump and no external mechanical work input. The first and second refrigerant cooling circuits are independent, and changes in the lubricating oil cooling load do not affect the high-pressure liquid supply flow regulation of the refrigeration system. Furthermore, the first refrigerant flowing in the first refrigerant cooling circuit can use Freon, avoiding the use of ammonia, the same refrigerant used in the second refrigerant. This helps reduce the overall ammonia charge in the refrigeration system, ensuring it meets relevant ammonia charge requirements and achieving ammonia reduction.

[0076] The oil cooler 2 can be charged with the first refrigerant or secondary refrigerant in the manufacturing workshop. Only the pipeline needs to be connected at the installation site. It is easy to standardize production and easy to maintain in the later stage of use.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil cooling system for a refrigeration system, characterized in that, include: Evaporative condenser, oil cooler, oil heat exchange pipeline and first heat exchange tube; The evaporative condenser includes a housing, a second heat exchange tube, and a spray device, wherein the second heat exchange tube and the spray device are arranged sequentially inside the housing along the height direction of the housing. The first heat exchange tube is located inside the housing, and the oil cooler is located outside the housing. The first heat exchange tube, the oil heat exchange pipeline, and the oil cooler form a first refrigerant cooling circuit for cooling the lubricating oil inside the oil cooler. The second heat exchange tube is used to connect to the compressor and the evaporator. The second heat exchange tube, the compressor and the evaporator form a second refrigerant cooling circuit for cooling the heat source of the refrigeration system. The oil heat exchange pipeline includes a first pipeline and a second pipeline; one end of the first pipeline is connected to the outlet of the first heat exchange tube, and the other end is connected to the refrigerant inlet of the oil cooler. One end of the second pipeline is connected to the refrigerant outlet of the oil cooler, and the other end is connected to the inlet of the first heat exchange tube; the first pipeline includes a first section and a second section connected in sequence, at least one of the first section and the second section being arranged in a vertical direction; the second pipeline includes a third section and a fourth section connected in sequence, at least one of the third section and the fourth section being arranged in a vertical direction; A fan is provided on the top of the housing, and the first heat exchange tube is located between the fan and the spray device; the first heat exchange tube is located below the spray device, and the spray device can spray cooling water onto the first heat exchange tube.

2. The oil cooling system for a refrigeration system according to claim 1, characterized in that, The oil cooling system also includes a refrigerant pump, which is located on the oil heat exchange pipeline and is used to drive the flow of refrigerant in the first refrigerant cooling circuit.

3. The oil cooling system for a refrigeration system according to claim 1, characterized in that, The first heat exchange tube is positioned above the second heat exchange tube.

4. The oil cooling system for a refrigeration system according to claim 1, characterized in that, The evaporative condenser also includes a water supply assembly; The water supply assembly includes a water supply pipeline and a circulating water pump. One end of the water supply pipeline is connected to the bottom of the tank, and the other end of the water supply pipeline is connected to the top of the tank. The circulating water pump is located on the water supply pipeline.

5. A refrigeration system, characterized in that, Including the oil cooling system for a refrigeration system as described in any one of claims 1 to 4.

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