Water cooling unit

Abstract

The utility model provides a water chilling unit. The water chilling unit comprises a refrigeration circulation system and a lubricating oil circulation system. The refrigeration circulation system comprises a compressor, a condenser, a throttler and an evaporator. The lubricating oil circulating system comprises an oil tank and a lubricating oil temperature adjusting system, and a refrigerant pipeline is arranged between the oil tank and the evaporator. The oil tank, the lubricating oil temperature adjusting system and the compressor are sequentially connected to form a lubricating oil circulation loop through which lubricating oil flows. The oil tank comprises an oil inlet and an oil outlet. The lubricating oil temperature adjusting system comprises a sub-compressor, a sub-condenser, a sub-throttler and a sub-evaporator which are connected in sequence. And the sub-condenser is in heat exchange connection with the oil inlet and is used for heating the lubricating oil. The sub-evaporator is in heat exchange connection with the oil outlet and used for cooling the lubricating oil. According to the water cooling unit, lubricating oil is heated through the sub-condenser, the lubricating oil is cooled through the sub-evaporator, and the viscosity of the lubricating oil under the condition that the water outlet temperature of the evaporator is high can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration units, and in particular to a water cooling unit. Background Art

[0002] With the rapid development of data centers, the outlet water temperature of the evaporator in the water cooling unit is required to be continuously increased to improve the cooling effect. As the outlet water temperature of the evaporator increases, the pressure in the evaporator also increases. The evaporator is connected to the oil tank containing the lubricating oil, which will also increase the pressure in the oil tank, causing more refrigerant to be dissolved in the lubricating oil, resulting in a decrease in the concentration of the lubricating oil, affecting the lubricating effect of the lubricating oil. Utility Model Content

[0003] The present application provides a water cooling unit to solve at least some of the problems in the related art.

[0004] The present application provides a water cooling unit, comprising:

[0005] A refrigeration cycle system, comprising a compressor, a condenser, a throttle and an evaporator; the compressor, the condenser, the throttle and the evaporator are connected in sequence to form a refrigerant circulation loop for flowing a refrigerant;

[0006] A lubricating oil circulation system, comprising an oil tank and a lubricating oil temperature regulating system, wherein a refrigerant pipeline is provided between the oil tank and the evaporator; the oil tank, the lubricating oil temperature regulating system and the compressor are sequentially connected to form a lubricating oil circulation loop for the lubricating oil to flow through;

[0007] Among them, the oil tank includes an oil inlet and an oil outlet; the lubricating oil temperature control system includes a sub-compressor, a sub-condenser, a sub-throttle and a sub-evaporator connected in sequence; the sub-condenser is heat-exchangedly connected to the oil inlet for heating the lubricating oil; the sub-evaporator is heat-exchangedly connected to the oil outlet for cooling the lubricating oil.

[0008] Optionally, the lubricating oil circulation system also includes a regulating valve connected between the oil tank and the sub-evaporator, the regulating valve including an oil inlet and an oil outlet, the oil inlet being connected to the oil tank, the oil outlet being respectively connected to the sub-evaporator and the compressor, the regulating valve being used to adjust the ratio of the amount of oil flowing through the sub-evaporator to the amount of oil at the oil inlet.

[0009] Optionally, the refrigeration cycle system further includes an economizer, which includes an inlet and an outlet, wherein the inlet is connected to the condenser, and the outlet is respectively connected to the compressor and the evaporator.

[0010] Optionally, the oil outlet is connected to the economizer and the sub-evaporator in sequence for heat exchange, and the economizer is used to cool the lubricating oil.

[0011] Optionally, the lubricating oil circulation system also includes a regulating valve connected between the economizer and the sub-evaporator, the regulating valve including an oil inlet and an oil outlet, the oil inlet being connected to the economizer, the oil outlet being respectively connected to the sub-evaporator and the compressor, the regulating valve being used to adjust the ratio of the amount of oil flowing through the sub-evaporator to the amount of oil at the oil inlet.

[0012] Optionally, the throttle includes a first throttling orifice plate and a second throttling orifice plate, wherein the first throttling orifice plate is connected between the condenser and the economizer, and the second throttling orifice plate is connected between the economizer and the evaporator.

[0013] Optionally, the evaporator includes a water inlet and a water outlet, the water inlet is provided with a first temperature sensor, the first temperature sensor is used to detect the temperature in the water inlet; the water outlet is provided with a second temperature sensor, the second temperature sensor is used to detect the temperature in the water outlet.

[0014] Optionally, the compressor includes an oil inlet, and the oil inlet is provided with a third temperature sensor, and the third temperature sensor is used to detect the temperature of the lubricating oil in the oil inlet.

[0015] Optionally, a booster pump is also included, which is arranged at the oil outlet.

[0016] Optionally, it also includes an ejector connected between the evaporator and the oil tank to allow the lubricating oil vapor in the evaporator to flow back to the oil tank; the compressor is power-connected to the ejector to provide power for the ejector.

[0017] Compared with the related art, the water cooling unit provided by this application has the following beneficial effects:

[0018] The water-cooling unit provided in the present application includes a refrigeration cycle system and a lubricating oil circulation system. The lubricating oil circulation system includes an oil tank and a lubricating oil temperature control system. The oil tank includes an oil inlet and an oil outlet. By making the lubricating oil temperature control system include a sub-compressor, a sub-condenser, a sub-throttle and a sub-evaporator connected in sequence, and making the sub-condenser heat-exchange connected to the oil inlet for heating the lubricating oil, the temperature of the lubricating oil in the oil tank can be increased, and then the refrigerant dissolved in the lubricating oil can enter the evaporator from the refrigerant pipeline, thereby reducing the concentration of the refrigerant in the lubricating oil; by making the sub-evaporator heat-exchange connected to the oil outlet for cooling the lubricating oil, the temperature of the lubricating oil entering the compressor can be reduced, thereby improving the lubricating effect of the lubricant.

[0019] Compared with the related art, in which a separate heater is provided in the oil tank to heat the lubricating oil in the oil tank and the lubricating oil entering the compressor is cooled by the economizer of the refrigeration cycle system, the water-cooled unit provided by the present patent application heats the lubricating oil by the sub-condenser and cools the lubricating oil entering the compressor by the sub-evaporator, and no longer relies solely on the economizer in the refrigeration cycle system to cool the lubricating oil entering the compressor. This can avoid the temperature of the lubricating oil entering the compressor being subject to the temperature of the economizer in the refrigeration cycle system, and avoid the situation where the temperature cannot be reduced to the ideal temperature by relying solely on the economizer for cooling. Cooling the lubricating oil entering the compressor by the sub-evaporator and the economizer at the same time can reduce the heat exchange of the economizer and improve the energy efficiency ratio of the refrigeration cycle system where the economizer is located.

[0020] The sub-condenser used to heat the lubricating oil in the oil tank and the sub-evaporator used to cool the lubricating oil entering the compressor belong to the same independent refrigeration cycle system. The performance coefficient of the refrigeration cycle system is greater than 1. When the sub-compressor inputs a small power, the sub-evaporator can absorb a large amount of heat and the sub-condenser can release a large amount of heat. Energy can be saved when heating and cooling the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic structural diagram of a water cooling unit 1 provided in one embodiment of the present application;

[0022] Figure 2 Shown is a schematic structural diagram of a water cooling unit 1 provided in another embodiment of the present application.

[0023] Reference numerals:

[0024] Water-cooling unit 1, refrigeration cycle system 10, compressor 11, oil inlet 111, third temperature sensor 112, condenser 12, throttle 13, first throttling orifice 131, second throttling orifice 132, evaporator 14, water inlet 141, water outlet 142, first temperature sensor 143, second temperature sensor 144, economizer 15, inlet 151, outlet 152, refrigerant pipeline 16, lubricating oil circulation system 20, oil tank 30, oil inlet 31, oil outlet 32, booster pump 33, ejector 34, lubricating oil temperature control system 40, sub-compressor 41, sub-condenser 42, sub-throttle 43, sub-evaporator 44, regulating valve 45, oil inlet end 451, oil outlet end 452, refrigerant circulation loop 17, lubricating oil circulation loop 18. DETAILED DESCRIPTION

[0025] The water cooling unit 1 is a refrigeration device that uses water for cooling, and is generally used to cool the heat generated in large buildings or industrial equipment and large machine rooms. The water cooling unit 1 includes a refrigeration cycle system 10, and the refrigeration cycle system 10 includes a compressor 11, a condenser 12, a throttle 13 and an evaporator 14; the compressor 11, the condenser 12, the throttle 13 and the evaporator 14 are connected in sequence to form a refrigerant circulation loop 17 for the refrigerant to flow through. The compressor 11, the condenser 12, the throttle 13 and the evaporator 14, these components interact with each other to make the refrigerant circulate in different states to achieve a cooling effect.

[0026] The compressor 11 is the core component of the refrigeration cycle system 10, which is responsible for compressing the refrigerant gas into a high-pressure gas. Through compression, the temperature and pressure of the refrigerant will increase. The condenser 12 cools the high-temperature and high-pressure refrigerant gas into a liquid by heat dissipation. The condenser 12 usually takes the form of a heat sink or a pipe to exchange heat between the refrigerant and the external environment, so that it cools and releases heat. The throttle 13 is a key component connecting the condenser 12 and the evaporator 14. Its function is to control the flow rate and pressure of the refrigerant so that it becomes a low-temperature and low-pressure state after passing through the throttle 13. The evaporator 14 is a heat exchanger in the refrigeration cycle system 10, which is responsible for absorbing heat from the surrounding environment. The refrigerant changes from a low-temperature and low-pressure liquid state to a low-temperature and low-pressure vapor state in the evaporator 14, thereby absorbing heat and lowering the temperature of the surrounding environment.

[0027] The working process of the refrigeration cycle system 10 is cyclical. The refrigerant is circulated and driven by the compressor 11, and continuously circulates through the condenser 12, the throttle 13 and the evaporator 14 to absorb and release heat, thereby achieving the purpose of cooling.

[0028] With the rapid development of data centers, the outlet water temperature of the evaporator 14 in the water cooling unit 1 is required to be continuously increased to improve the cooling effect and reduce the cooling power consumption. The outlet water temperature of the evaporator 14 in the water cooling unit 1 is required to be increased from the original 18 degrees to 22 degrees or even 24 degrees. As the outlet water temperature of the evaporator 14 increases, the pressure in the evaporator 14 also increases. A refrigerant pipe 16 is provided between the oil tank 30 containing the lubricating oil and the evaporator 14, which is used to release the refrigerant gas in the oil tank 30 to the evaporator 14. Because the evaporator 14 is connected to the oil tank 30, the higher pressure in the evaporator 14 will cause the pressure in the oil tank 30 to be higher, thereby causing more refrigerant to be dissolved in the lubricating oil, resulting in a decrease in the concentration of the lubricating oil, reducing the viscosity of the lubricating oil, and affecting the lubricating effect of the lubricating oil.

[0029] The viscosity of lubricating oil is closely related to the refrigerant concentration in the lubricating oil and the temperature of the lubricating oil itself. The higher the refrigerant concentration of the lubricating oil, the lower the viscosity of the lubricating oil. The higher the temperature of the lubricating oil, the lower the viscosity.

[0030] In order to enable the water-cooling unit 1 to maintain a high viscosity of the lubricating oil when the outlet water temperature of the evaporator 14 is high, and to avoid affecting the operation of the compressor 11 due to insufficient viscosity of the lubricating oil, a heater is usually arranged in the oil tank 30 to increase the temperature in the oil tank 30, so that the refrigerant dissolved in the lubricating oil in the oil tank 30 evaporates and enters the evaporator 14 through the refrigerant pipe 16, thereby reducing the refrigerant concentration of the lubricating oil in the oil tank 30.

[0031] And because the viscosity of the lubricating oil is not only related to the concentration of the refrigerant in the lubricating oil, but also to the temperature of the lubricating oil, when the temperature of the lubricating oil increases, the viscosity of the lubricating oil decreases. In the related art, the refrigerant is usually cooled by the economizer 15 in the refrigeration cycle system 10.

[0032] However, the related technology has certain disadvantages. First, under high evaporation pressure, the lubricating oil concentration-temperature curve is very flat near the working point. When the lubricating oil is near the working point, the refrigerant concentration of the lubricating oil mainly depends on the pressure of the oil tank 30. When the oil temperature rises, the concentration of the refrigerant will decrease, but the lubricating oil needs to be heated to a larger temperature difference to effectively reduce the lubricating oil content of the lubricating oil. Second, the increase in the temperature of the oil tank 30 means that more heat exchange is required when cooling the oil temperature in the economizer 15 later, which requires the design of a larger heat exchanger. A larger electric heater is designed in the oil tank 30 to heat the lubricating oil, and the lubricating oil needs to be cooled later, resulting in energy waste of electric heating, which is not conducive to the energy efficiency ratio of the water-cooled unit 1. Third, the lubricating oil is cooled by the refrigerant in the economizer 15. The oil temperature heat exchange here is passive cooling. The lowest temperature to which the oil temperature drops is the liquid phase temperature of the economizer 15, and the liquid phase temperature of the economizer 15 mainly depends on the operating temperature. In applications with high condensate inlet temperature, because the liquid temperature of the economizer 15 is too high, the corresponding lubricating oil is cooled to the liquid temperature value of the economizer 15, but it is not reduced to a suitable temperature, and the viscosity of the lubricating oil still does not meet the requirements.

[0033] Please refer to Figure 1 , Figure 1 The figure shows a schematic diagram of the structure of a water cooling unit 1 provided in one embodiment of the present application. Figure 1 In the illustrated embodiment, the water cooling unit 1 includes a refrigeration cycle system 10 and a lubricating oil circulation system 20. The refrigeration cycle system 10 includes a compressor 11, a condenser 12, a throttle 13 and an evaporator 14. The compressor 11, the condenser 12, the throttle 13 and the evaporator 14 are connected in sequence to form a refrigerant circulation loop 17 for flowing refrigerant.

[0034] The lubricating oil circulation system 20 includes an oil tank 30 and a lubricating oil temperature control system 40, and a refrigerant pipe 16 is provided between the oil tank 30 and the evaporator 14. The oil tank 30, the lubricating oil temperature control system 40 and the compressor 11 are connected in sequence to form a lubricating oil circulation loop 18 for flowing lubricating oil.

[0035] The oil tank 30 includes an oil inlet 31 and an oil outlet 32. The lubricating oil temperature control system 40 includes a sub-compressor 41, a sub-condenser 42, a sub-throttle 43 and a sub-evaporator 44 connected in sequence. The sub-condenser 42 is connected to the oil inlet 31 for heat exchange, and is used to heat the lubricating oil. The sub-evaporator 44 is connected to the oil outlet 32 ​​for heat exchange, and is used to cool the lubricating oil.

[0036] The water-cooling unit 1 provided in the present application includes a refrigeration cycle system 10 and a lubricating oil circulation system 20. The lubricating oil circulation system 20 includes an oil tank 30 and a lubricating oil temperature control system 40. The oil tank 30 includes an oil inlet 31 and an oil outlet 32. The lubricating oil temperature control system 40 includes a sub-compressor 41, a sub-condenser 42, a sub-throttle 43 and a sub-evaporator 44 connected in sequence, and the sub-condenser 42 is connected to the oil inlet 31 for heat exchange so as to heat the lubricating oil. The temperature of the lubricating oil in the oil tank 30 can be increased, and the refrigerant dissolved in the lubricating oil can enter the evaporator 14 from the refrigerant pipe 16, thereby reducing the concentration of the refrigerant in the lubricating oil. The sub-evaporator 44 is connected to the oil outlet 32 ​​for heat exchange so as to cool the lubricating oil. The temperature of the lubricating oil entering the compressor 11 can be reduced, thereby improving the lubricating effect of the lubricant.

[0037] Compared with the related art, in which a separate heater is provided in the oil tank 30 to heat the lubricating oil in the oil tank 30 and the lubricating oil entering the compressor 11 is cooled by the economizer 15 of the refrigeration cycle system 10, the water cooling unit 1 provided in the present patent application heats the lubricating oil by the sub-condenser 42, and no heater is provided in the oil tank 30, so that the volume of the oil tank 30 can be reduced. The lubricating oil entering the compressor 11 is no longer cooled by the economizer 15 in the refrigeration cycle system 10 alone, so that the temperature of the lubricating oil entering the compressor 11 can be avoided from being restricted by the temperature of the economizer 15 in the refrigeration cycle system 10, and the situation that the temperature cannot be reduced to the ideal temperature by cooling only by the economizer 15 can be avoided. The lubricating oil entering the compressor 11 is cooled by the sub-evaporator 44 and the economizer 15 is also cooled, so that the heat exchange of the economizer 15 can be reduced, and the energy efficiency ratio of the refrigeration cycle system 10 where the economizer 15 is located can be improved.

[0038] The sub-condenser 42 for heating the lubricating oil in the oil tank 30 and the sub-evaporator 44 for cooling the lubricating oil entering the compressor 11 belong to the same independent refrigeration cycle. The performance coefficient of the refrigeration cycle is greater than 1. When the sub-compressor 41 inputs a small power, the sub-evaporator 44 can absorb a large amount of heat and the sub-condenser 42 can release a large amount of heat. Energy can be saved when heating and cooling the lubricating oil.

[0039] Please refer to Figure 2 , Figure 2 The figure shows a schematic diagram of the structure of a water cooling unit 1 provided in another embodiment of the present application. Figure 2 In the illustrated embodiment, the lubricating oil circulation system 20 further includes a regulating valve 45, which is connected between the oil tank 30 and the sub-evaporator 44. The regulating valve 45 includes an oil inlet 451 and an oil outlet 452. The oil inlet 451 is connected to the oil tank 30, and the oil outlet 452 is connected to the sub-evaporator 44 and the compressor 11, respectively. The regulating valve 45 is used to adjust the ratio of the amount of oil flowing through the sub-evaporator 44 to the amount of oil at the oil inlet 451. With such a configuration, the regulating valve 45 can be used to allow a portion of the lubricating oil flowing from the oil tank 30 to the compressor 11 to flow directly from the oil tank 30 to the compressor 11, and the other portion to flow to the compressor 11 after cooling through the sub-evaporator 44. The regulating valve 45 is used to adjust the ratio of the amount of oil flowing through the sub-evaporator 44 to the amount of oil at the oil inlet 451, thereby achieving the regulation of the temperature of the lubricating oil flowing to the compressor 11. It can be understood that when the temperature of the lubricating oil flowing to the compressor 11 needs to be significantly reduced, the regulating valve 45 can be adjusted to increase the proportion of the lubricating oil that is cooled by the sub-evaporator 44 and then flows to the compressor 11. When the temperature of the lubricating oil flowing to the compressor 11 needs to be slightly reduced, the regulating valve 45 can be adjusted to reduce the proportion of the lubricating oil that is cooled by the sub-evaporator 44 and then flows to the compressor 11.

[0040] It is understandable that when cooling the lubricating oil, the lubricating performance and economy of the lubricating oil should be comprehensively considered, and the temperature of the lubricating oil should be reduced to a temperature that meets the operation of the compressor 11, avoiding the one-sided pursuit of reducing the lubricating oil temperature and causing excessive energy consumption.

[0041] Please also refer to Figure 1 and Figure 2 ,exist Figure 1 and Figure 2 In the illustrated embodiment, the refrigeration cycle system 10 further includes an economizer 15 . The economizer 15 includes an inlet 151 and an outlet 152 . The inlet 151 is connected to the condenser 12 , and the outlet 152 is connected to the compressor 11 and the evaporator 14 , respectively.

[0042] The economizer 15 is usually arranged between the evaporator 14 and the condenser 12 of the refrigeration cycle system 10 to achieve heat exchange with the refrigerant. At the condenser 12 end, the economizer 15 can help the refrigerant release more heat and improve the heat dissipation effect. At the evaporator 14 end, the economizer 15 can help the refrigerant absorb more heat, thereby improving the refrigeration effect. The design principle of the economizer 15 is to use the latent heat absorbed or released during the phase change of the refrigerant to perform heat exchange, thereby improving the efficiency of the system. Through the economizer 15, the refrigeration cycle system 10 can achieve a larger cooling capacity at the same refrigerant flow rate, or reduce the refrigerant flow rate at the same cooling capacity, thereby achieving the purpose of energy saving and cost reduction.

[0043] The outlet 152 of the economizer 15 is connected to the compressor 11, and part of the coolant can be sent from the evaporator 14 to the compressor 11 in liquid form, which reduces the compressor 11's compression workload on the coolant, thereby reducing the power consumption of the compressor 11. By providing the coolant in liquid form to enter the compressor 11, the cooling and lubrication conditions of the compressor 11 can be improved, thereby increasing its working efficiency and life.

[0044] The outlet 152 of the economizer 15 is connected to the evaporator 14, which can improve the heat exchange effect of the evaporator 14. By expanding part of the coolant in the economizer 15 to release heat before entering the evaporator 14, the heat exchange area of ​​the evaporator 14 can be increased, thereby improving its refrigeration effect. The liquid coolant content in the evaporator 14 can also be reduced. The economizer 15 can convert part of the coolant into gaseous state, reduce the liquid coolant content in the evaporator 14, and thus improve the heat transfer efficiency of the evaporator 14.

[0045] exist Figure 1 and Figure 2 In the embodiment shown, the oil outlet 32 ​​is connected to the economizer 15 and the sub-evaporator 44 in heat exchange connection in sequence, and the economizer 15 is used to cool the lubricating oil. In this arrangement, the lubricating oil can be cooled by the economizer 15 first, and then by the sub-evaporator 44. The cooling effect is ensured, and the temperature of the lubricating oil can be quickly reduced.

[0046] When the refrigeration cycle system 10 includes the economizer 15 and the lubricating oil circulation system 20 includes the regulating valve 45, the regulating valve 45 is connected between the economizer 15 and the sub-evaporator 44, and the regulating valve 45 includes an oil inlet end 451 and an oil outlet end 452, the oil inlet end 451 is connected to the economizer 15, and the oil outlet end 452 is respectively connected to the sub-evaporator 44 and the compressor 11, and the regulating valve 45 is used to adjust the ratio of the amount of oil flowing through the sub-evaporator 44 to the amount of oil at the oil inlet end 451. The temperature of the lubricating oil flowing to the compressor 11 can be adjusted by adjusting the regulating valve 45.

[0047] In some preferred embodiments, the throttle 13 includes a first throttling orifice plate 131 and a second throttling orifice plate 132 , the first throttling orifice plate 131 is connected between the condenser 12 and the economizer 15 , and the second throttling orifice plate 132 is connected between the economizer 15 and the evaporator 14 .

[0048] The first throttle orifice plate 131 and the second throttle orifice plate 132 play an important role in the refrigeration cycle system 10. The first throttle orifice plate 131 is usually located at the inlet of the throttle 13, while the second throttle orifice plate 132 is located at the outlet 152. The function of the first throttle orifice plate 131 is to restrict the flow of the refrigerant so that it partially evaporates when the pressure drops, thereby absorbing heat and reducing the temperature. It helps to ensure that the refrigerant has reached a certain degree of superheat before entering the downstream components to improve the performance of the system.

[0049] The second throttle orifice plate 132 further reduces the pressure of the refrigerant and controls its flow rate to ensure proper evaporation before entering the evaporator 14. This helps maintain the appropriate refrigerant flow and pressure to meet the refrigeration needs of the system. By properly designing and installing the first and second throttle orifice plates 132, the superheat and evaporation effect of the refrigerant can be effectively controlled, thereby improving the efficiency and performance of the entire refrigeration cycle system 10.

[0050] In some preferred embodiments, the evaporator 14 includes a water inlet 141 and a water outlet 142. The water inlet 141 is provided with a first temperature sensor 143, and the first temperature sensor 143 is used to detect the temperature in the water inlet 141. The water outlet 142 is provided with a second temperature sensor 144, and the second temperature sensor 144 is used to monitor the temperature in the water outlet 142.

[0051] By respectively arranging the first temperature sensor 143 and the second temperature sensor 144 at the water inlet 141 and the water outlet 142 of the evaporator 14, the temperature change of the refrigerant can be monitored. The first temperature sensor 143 is located at the water inlet 141, and the temperature of the refrigerant entering the evaporator 14 can be measured in real time. The evaporation process can also be detected. The second temperature sensor 144 is located at the water outlet 142, and the temperature of the refrigerant flowing out of the evaporator 14 can be measured. By comparing the temperature difference between the water inlet 141 and the water outlet 142, the heat exchange effect of the evaporator 14 and the evaporation degree of the refrigerant can be evaluated. If the temperature difference is large, it may indicate that the heat transfer effect of the evaporator 14 is good and the refrigerant has been fully evaporated. The refrigeration cycle can also be controlled. The operation of the refrigeration cycle system 10 can be controlled by the data of the first temperature sensor 143 and the second temperature sensor 144. According to the feedback of the temperature of the water inlet 141 and the water outlet 142, the working state of the evaporator 14 can be adjusted to maintain a proper refrigeration effect and stable operation of the system.

[0052] In some preferred embodiments, the compressor 11 includes an oil inlet 111, and the oil inlet 111 is provided with a third temperature sensor 112, and the third temperature sensor 112 is used to detect the temperature of the lubricating oil in the oil inlet 111. In this way, the temperature of the lubricating oil entering the compressor 11 can be monitored to avoid the temperature of the lubricating oil entering the compressor 11 being too high, which affects the viscosity of the lubricating oil, and when it is found that the temperature of the lubricating oil in the compressor 11 is too high or too low, the extent of cooling the lubricating oil can be adjusted by adjusting the regulating valve 45.

[0053] In some preferred embodiments, the lubricating oil temperature control system 40 further includes a booster pump 33, which is disposed at the oil outlet 32. By providing the booster pump 33, power can be provided for the lubricating oil to flow between the oil tank 30 and the compressor 11, thereby increasing the speed at which the lubricating oil flows between the oil tank 30 and the compressor 11, and improving the lubricating effect of the lubricating oil on the compressor 11.

[0054] In some preferred embodiments, the water cooling unit 1 further includes an ejector 34, which is connected between the evaporator 14 and the oil tank 30, so that the lubricating oil vapor in the evaporator 14 flows back to the oil tank 30. The ejector 34 can create a negative pressure area in the pipeline, so that liquid or gas can be drawn into the system. The compressor 11 is connected to the ejector 34 for providing power to the ejector 34. By providing the ejector 34, the lubricating oil in the evaporator 14 can enter the oil tank 30 through the lubricating oil pipeline provided between the oil tank 30 and the evaporator 14, so as to achieve the purpose of saving lubricating oil and protecting the environment.

Claims

1. A water cooling unit, characterized in that: The water cooling unit comprises: A refrigeration cycle system, comprising a compressor, a condenser, a throttle and an evaporator; the compressor, the condenser, the throttle and the evaporator are connected in sequence to form a refrigerant circulation loop for flowing a refrigerant; A lubricating oil circulation system, comprising an oil tank and a lubricating oil temperature regulating system, wherein a refrigerant pipeline is provided between the oil tank and the evaporator; the oil tank, the lubricating oil temperature regulating system and the compressor are sequentially connected to form a lubricating oil circulation loop for the lubricating oil to flow through; Among them, the oil tank includes an oil inlet and an oil outlet; the lubricating oil temperature control system includes a sub-compressor, a sub-condenser, a sub-throttle and a sub-evaporator connected in sequence; the sub-condenser is heat-exchangedly connected to the oil inlet for heating the lubricating oil; the sub-evaporator is heat-exchangedly connected to the oil outlet for cooling the lubricating oil.

2. The water cooling unit according to claim 1, characterized in that: The lubricating oil circulation system also includes a regulating valve connected between the oil tank and the sub-evaporator, the regulating valve includes an oil inlet end and an oil outlet end, the oil inlet end is connected to the oil tank, and the oil outlet end is respectively connected to the sub-evaporator and the compressor, and the regulating valve is used to adjust the ratio of the oil amount flowing through the sub-evaporator to the oil amount at the oil inlet end.

3. The water cooling unit according to claim 1, characterized in that: The refrigeration cycle system further includes an economizer, which includes an inlet and an outlet, wherein the inlet is connected to the condenser, and the outlet is respectively connected to the compressor and the evaporator.

4. The water cooling unit according to claim 3, characterized in that: The oil outlet is connected to the economizer and the sub-evaporator in sequence for heat exchange, and the economizer is used to cool the lubricating oil.

5. The water cooling unit according to claim 4, characterized in that: The lubricating oil circulation system also includes a regulating valve connected between the economizer and the sub-evaporator. The regulating valve includes an oil inlet end and an oil outlet end. The oil inlet end is connected to the economizer, and the oil outlet end is respectively connected to the sub-evaporator and the compressor. The regulating valve is used to adjust the ratio of the amount of oil flowing through the sub-evaporator to the amount of oil at the oil inlet end.

6. The water cooling unit according to claim 3, characterized in that: The throttle includes a first throttle orifice plate and a second throttle orifice plate, wherein the first throttle orifice plate is connected between the condenser and the economizer, and the second throttle orifice plate is connected between the economizer and the evaporator.

7. The water cooling unit according to claim 1, characterized in that: The evaporator includes a water inlet and a water outlet. The water inlet is provided with a first temperature sensor, which is used to detect the temperature in the water inlet; the water outlet is provided with a second temperature sensor, which is used to detect the temperature in the water outlet.

8. The water cooling unit according to claim 1, characterized in that: The compressor comprises an oil inlet, and the oil inlet is provided with a third temperature sensor, and the third temperature sensor is used to detect the temperature of the lubricating oil in the oil inlet.

9. The water cooling unit according to claim 1, characterized in that: It also includes a booster pump, which is arranged at the oil outlet.

10. The water cooling unit according to claim 1, characterized in that: It also includes an ejector connected between the evaporator and the oil tank to allow the lubricating oil vapor in the evaporator to flow back to the oil tank; the compressor is power-connected to the ejector to provide power for the ejector.

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