An air conditioning system

Abstract

The present application relates to the technical field of air-conditioning systems, and provides an air-conditioning system, including a refrigerant circulation loop and a cooling loop, wherein the refrigerant circulation loop includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected by a refrigerant pipeline; the cooling loop includes a cooling tower, a filter, a liquid storage tank and a pump body connected to the outdoor heat exchanger by a coolant pipeline; in the outdoor heat exchanger, the coolant pipeline is used to perform heat exchange with the refrigerant pipeline. The heat of the refrigerant in the refrigerant circulation loop can be effectively released to the coolant in the outdoor heat exchanger, effectively reducing the temperature of the refrigerant and significantly improving the heat exchange efficiency; and a filter and a liquid storage tank are provided in the cooling loop, and the filter is used to filter the coolant flowing out of the cooling tower to ensure the cooling quality of the coolant and extend the number of cooling cycles; and when the air-conditioning system is shut down, the coolant can be stored in the liquid storage tank, and there is no need to discharge the coolant out of the pipeline, thereby reducing the waste of water resources and improving the utilization rate.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning systems, and in particular provides an air-conditioning system. Background Art

[0002] With the rapid development of artificial intelligence computing power and 5G communication technology, the heat generated by equipment in data centers and communication base stations is increasing. Therefore, the air conditioners in data centers / communication base stations need to work for a long time to maintain the temperature and humidity environment requirements required by the computer room, resulting in increasing air conditioning energy consumption. This puts higher requirements on the design and development of air conditioning products.

[0003] In current technology, water cooling is used to exchange heat for the outdoor unit of the air conditioner. The heat generated during the air conditioning refrigeration process is absorbed by the cooling water in the cooling tower. When the outdoor unit of the air conditioner releases heat, the heat is transferred to the cooling tower. The cooling tower dissipates the heat into the atmosphere through heat exchange with the air, thereby reducing the temperature of the cooling water. In this way, the heat generated in the air conditioning refrigeration circuit is released, preparing for the next round of refrigeration cycle and reducing the energy consumption of the air conditioner.

[0004] However, the cooling water circulating in the existing cooling tower is in direct contact with the outside air and is easily contaminated by pollutants in the external environment, which leads to a decrease in the quality of the cooling water and affects the heat exchange efficiency. In addition, in order to prevent the cooling water from being polluted during equipment downtime or freezing in winter, the cooling water is usually discharged directly outside the pipeline, resulting in a large amount of water waste and increasing the system's operation and maintenance costs. Summary of the invention

[0005] The purpose of the embodiment of the present application is to provide an air-conditioning system, aiming to solve the problem that the cooling water circulating in the cooling tower of the existing air-conditioning system is easily contaminated by pollutants in the external environment, resulting in a decrease in the quality of the cooling water; and the cooling water is difficult to store.

[0006] To achieve the above purpose, the technical solution adopted in this application is:

[0007] In the first aspect, an embodiment of the present application provides an air-conditioning system, including a refrigerant circulation loop and a cooling loop, the refrigerant circulation loop including a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected through a refrigerant pipeline; the cooling circuit includes a cooling tower, a filter, a liquid storage tank and a pump body connected to the outdoor heat exchanger through a coolant pipeline; in the outdoor heat exchanger, the coolant pipeline is used for heat exchange with the refrigerant pipeline.

[0008] The beneficial effect of the present application is that, through the cooling circuit, the heat of the refrigerant in the refrigerant circulation circuit can be effectively released to the coolant in the outdoor heat exchanger, effectively reducing the temperature of the refrigerant; the coolant further exchanges heat with the outdoor air in the cooling tower and discharges the heat into the atmosphere, effectively reducing the temperature of the coolant, significantly improving the heat exchange efficiency, improving the operating efficiency of the air conditioning system, and effectively reducing energy consumption. A filter and a liquid storage tank are provided in the cooling circuit. The filter is used to filter the coolant flowing out of the cooling tower to ensure the cooling quality of the coolant and extend the number of cooling cycles; and when the air conditioning system is shut down, the coolant can be stored in the liquid storage tank, and there is no need to discharge the coolant out of the pipeline, reducing the waste of water resources and improving the utilization rate.

[0009] In some embodiments, a heating device is provided in the liquid storage tank, and the heating device is used to heat the coolant in the liquid storage tank.

[0010] By adopting the above technical solution, the electric heating device can effectively heat the coolant, prevent the pipeline from freezing in winter, and ensure smooth flow of the coolant pipeline.

[0011] In some embodiments, the filter is disposed between the cooling tower and the liquid storage tank, and the liquid storage tank is disposed at the lowest point of the cooling circuit in the direction of gravity.

[0012] By adopting the above technical solution, the coolant can flow into the liquid storage tank by gravity, which is convenient for liquid storage.

[0013] In some embodiments, the coolant pipeline is provided with pipeline valves at both ends of the liquid storage tank.

[0014] By adopting the above technical solution, when there is no need to perform heat exchange on the refrigerant in the condenser, the coolant in the coolant pipeline can be discharged into the liquid storage tank, and then the pipeline valve can be closed to store the coolant in the liquid storage tank to avoid shutdown pollution.

[0015] In some embodiments, the cooling tower is provided with a dust screen and / or a fan filter at the air inlet.

[0016] By adopting the above technical solution, the dust screen and the fan filter can filter impurities and particulate matter in the air to prevent these impurities from entering the interior of the cooling tower.

[0017] In some embodiments, the liquid storage tank is provided with a liquid inlet valve assembly independent of the coolant pipeline.

[0018] By adopting the above technical solution, the liquid in the liquid storage tank can be replaced, injected or chemical agents can be added through the liquid inlet.

[0019] In some embodiments, the coolant in the coolant pipeline is injected into the cooling tower by spraying.

[0020] By adopting the above technical solution, the spray coolant in the cooling tower directly contacts the incoming air for heat exchange, and the heat exchange effect is better.

[0021] In some embodiments, the refrigerant circulation loop also includes a reheater; the refrigerant pipeline includes a first branch connected to the indoor heat exchanger, the reheater, the compressor and the outdoor heat exchanger, and a second branch connected to the indoor heat exchanger, the throttling device, the reheater and the outdoor heat exchanger; in the reheater, the refrigerant in the first branch is used for heat exchange with the refrigerant in the second branch.

[0022] By adopting the above technical solution, the refrigerant flowing out from the indoor heat exchanger in the first branch will exchange heat with the refrigerant flowing out from the outdoor heat exchanger in the second branch in the regenerator, so as to increase the compressor intake superheat and the throttling device inlet subcooling. The heat of the refrigerant in the circulation loop itself passing through the regenerator can be reasonably utilized to improve energy utilization efficiency, so that the air conditioner has higher performance.

[0023] In some embodiments, the refrigerant circulation loop further includes a fluorine pump, which is connected in series on the second branch between the heat regenerator and the outdoor heat exchanger. The refrigerant circulation loop has a compressor mode, a mixed mode and a fluorine pump mode.

[0024] By adopting the above technical solution, when the outdoor temperature is high, such as in summer, the compressor mode is operated for efficient cooling; when the outdoor ambient temperature is slightly lower than the compressor starting temperature and higher than the fluorine pump starting temperature, the air-conditioning system will adopt a mixed mode, that is, the compressor and the fluorine pump work at the same time, but the compressor runs at a lower frequency, thereby optimizing energy consumption; when the outdoor temperature is low, such as in winter, the fluorine pump mode is operated to use natural cold sources for cooling, thereby achieving efficient energy saving.

[0025] In some embodiments, the air conditioning system further includes a sensor assembly, and the sensor assembly is used to detect the temperature, pressure and flow in the refrigerant circulation loop and the cooling loop.

[0026] By adopting the above technical solution, the temperature, pressure and flow rate at various positions of the air-conditioning system are detected through the sensor component, thereby effectively controlling the stable operation of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the structure of an air conditioning system provided in one embodiment of the present application.

[0029] Among them, the reference numerals in the figure are:

[0030] 100. refrigerant circulation circuit; 110. refrigerant pipeline;

[0031] 200, cooling circuit; 210, coolant pipeline;

[0032] 1. Indoor heat exchanger; 2. Compressor; 3. Oil separator; 4. Outdoor heat exchanger; 5. Refrigerant tank; 6. Fluorine pump; 7. Regenerator; 8. Dry filter; 9. Sight glass; 10. Throttling device; 11. First one-way valve; 12. Second one-way valve; 13. Return oil capillary; 14. Cooling tower; 15. Filter; 16. Liquid storage tank; 17. Electric heating device; 18. Pump body; 19. Third pipeline valve; 20. First pipeline valve; 21. Second pipeline valve; 22. Liquid inlet valve assembly. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0034] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0038] For the convenience of description, unless otherwise specified, the directions of up, down, left, right, front and back in this article are all based on the state of the air-conditioning system when it is in use. The door of the air-conditioning system is the front, the opposite direction is the rear, and the vertical direction is the up and down direction.

[0039] With the rapid development of artificial intelligence computing power and 5G communication technology, the heat dissipation of data centers and communication base stations is increasing, resulting in the increasing energy consumption of data center / communication base station air conditioning products, which puts higher requirements on the design and development of air conditioning products. In the current technology, the heat generated in the air conditioning refrigeration process is absorbed by the cooling water of the cooling tower. When the air conditioning outdoor unit releases heat, the heat will be transferred to the cooling tower. The cooling tower dissipates the heat into the atmosphere through heat exchange with the air, so that the temperature of the cooling water is reduced. In this way, the heat generated in the air conditioning refrigeration circuit is released, preparing for the next round of refrigeration cycle and reducing the energy consumption of the air conditioning. However, the cooling water circulating in the existing cooling tower is in direct contact with the outside air and is easily contaminated by pollutants in the external environment, resulting in a decrease in the quality of the cooling water and affecting the heat exchange efficiency. In addition, in order to prevent the cooling water from being contaminated during equipment downtime or freezing in winter, the cooling water is usually discharged directly to the outside of the pipeline, resulting in a large amount of water resources Waste, also increased the operation and maintenance cost of the system.

[0040] Based on this, in order to solve the above problems, the present application designs an air conditioning system. Through the cooling circuit, the heat of the refrigerant in the refrigerant circulation circuit can be effectively released to the coolant in the outdoor heat exchanger, effectively reducing the temperature of the refrigerant; the coolant further exchanges heat with the outdoor air in the cooling tower and discharges the heat into the atmosphere, effectively reducing the temperature of the coolant, significantly improving the heat exchange efficiency, improving the operating efficiency of the air conditioning system, and effectively reducing energy consumption. A filter and a liquid storage tank are provided in the cooling circuit. The filter is used to filter the coolant flowing out of the cooling tower to ensure the cooling quality of the coolant and extend the number of cooling cycles; and when the air conditioning system is shut down, the coolant can be stored in the liquid storage tank, and there is no need to discharge the coolant out of the pipeline, reducing the waste of water resources and improving the utilization rate.

[0041] refer to Figure 1 An embodiment of the present application provides an air-conditioning system, including a refrigerant circulation loop 100 and a cooling loop 200. The refrigerant circulation loop 100 includes a compressor 2, an outdoor heat exchanger 4, a throttling device 10 and an indoor heat exchanger 1 connected through a refrigerant pipeline 110; the cooling loop 200 includes a cooling tower 14, a filter 15, a liquid storage tank 16 and a pump body 18 connected to the outdoor heat exchanger 4 through a coolant pipeline 210; in the outdoor heat exchanger 4, the coolant pipeline 210 is used for heat exchange with the refrigerant pipeline 110.

[0042] Specifically, the refrigerant circulation loop 100 and the cooling loop 200 are two independent loops, and heat exchange occurs only in the outdoor heat exchanger 4. The refrigerant circulation loop 100 is used to achieve air conditioning refrigeration, and the compressor 2, the outdoor heat exchanger 4, the throttling device 10 and the indoor heat exchanger 1 form a closed loop through the refrigerant pipeline 110, and the refrigerant pipeline 110 is filled with refrigerant.

[0043] It can be understood that when the air conditioning system is working, through the refrigerant circulation loop 100, the refrigerant absorbs indoor heat in the indoor heat exchanger 1, so that the indoor temperature is reduced; correspondingly, the refrigerant exchanges heat with the cooling water in the coolant pipeline 210 through the outdoor heat exchanger 4, and then releases the heat to the cooling water, and the refrigerant can be used for the next round of refrigeration cycle. Through the cooling circuit 200, the coolant takes away the heat of the refrigerant and flows to the cooling tower 14 through the pump body 18. The coolant exchanges heat with the outdoor air in the cooling tower 14 and discharges the heat back to normal temperature. The coolant can be used for the next round of cooling cycle. Through the cooling circuit 200, the heat of the refrigerant is effectively released in the outdoor heat exchanger 4, and the heat exchange efficiency is significantly improved; the operating efficiency of the air conditioning system is improved, and energy consumption is effectively reduced.

[0044] A filter 15 is provided in the cooling circuit 200, and the filter 15 is used to filter the coolant flowing out of the water outlet of the cooling tower 14. When the coolant exchanges heat with the outdoor air in the cooling tower 14, it is in direct contact with the outside air and is easily contaminated by pollutants in the outside environment, resulting in a decrease in the cooling quality of the coolant circulation and affecting the heat exchange efficiency; the coolant flowing out of the cooling tower 14 can be filtered through the filter 15 to ensure the cooling quality of the coolant, increase the number of cooling cycles of the coolant, and reduce the number of times the coolant is replenished in the cooling circuit 200.

[0045] The liquid storage tank 16 is used to store coolant. That is, when the air conditioning system is shut down, the pump body 18 stops running, and the coolant can be stored in the liquid storage tank 16 for use when the air conditioning system is restarted. There is no need to discharge the coolant out of the pipeline, reducing the waste of water resources.

[0046] The air conditioning system of the present application, through the cooling circuit 200, the heat of the refrigerant in the refrigerant circulation circuit 100 can be effectively released to the coolant in the outdoor heat exchanger 4, effectively reducing the temperature of the refrigerant; the coolant further exchanges heat with the outdoor air in the cooling tower 14 and discharges the heat into the atmosphere, effectively reducing the temperature of the coolant, significantly improving the heat exchange efficiency, improving the operating efficiency of the air conditioning system, and effectively reducing energy consumption. In addition, a filter 15 and a liquid storage tank 16 are provided in the cooling circuit 200. The filter 15 is used to filter the coolant flowing out of the cooling tower 201 to ensure the cooling quality of the coolant and extend the number of cooling cycles; and when the air conditioning system is shut down, the coolant can be stored in the liquid storage tank 16, and there is no need to discharge the coolant out of the pipeline, reducing the waste of water resources and improving the utilization rate.

[0047] In some embodiments, a heating device 17 is provided in the liquid storage tank 16 , and the heating device 17 is used to heat the coolant in the liquid storage tank 16 .

[0048] The heating device 17 is a liquid heater, and the heating device 17 heats the coolant in the liquid storage tank 16 by being energized by a power supply device.

[0049] It is understandable that in a low temperature environment, the coolant in the coolant pipeline 210 may freeze, blocking the flow of the coolant; the electric heating device 17 can effectively heat the cooling water in the liquid storage tank 16, increase the temperature of the coolant, and prevent the pipeline from freezing in winter, thereby ensuring smooth flow of liquid in the coolant pipeline 210.

[0050] Specifically, the heating device 17 has an antifreeze working state and a thawing operating state.

[0051] In the antifreeze working state, the air conditioning system is in operation, the electric heating device is turned on, and the temperature of the water storage tank is controlled to reach the antifreeze set temperature.

[0052] In the defrosting working state, the air conditioning system is in a shutdown state, the electric heating device is turned on, and the temperature in the water storage tank is controlled to reach the antifreeze set temperature.

[0053] In some embodiments, the filter 15 is disposed between the cooling tower 14 and the liquid storage tank 16 , and the liquid storage tank 16 is disposed at the lowest point of the cooling circuit in the direction of gravity.

[0054] Specifically, the coolant filtered by the filter 15 flows into the liquid storage tank 16 , so that the liquid storage tank 16 stores only clean coolant, thereby preventing impurities from causing scaling, corrosion, and bacterial growth in the liquid storage tank 16 .

[0055] The liquid storage tank 16 is arranged at the lowest point of the cooling circuit in the direction of gravity, that is, when the air conditioning system is shut down, the coolant in the coolant pipeline 210 can flow into the liquid storage tank 16 by gravity, so that all the coolant in the pipeline can be stored in the liquid storage tank 16.

[0056] In some embodiments, pipeline valves are respectively provided at both ends of the cooling liquid pipeline 210 and the liquid storage tank 16 .

[0057] Specifically, the pipeline valve includes a first pipeline valve 20 disposed on one side of the liquid storage tank 16 close to the filter 15 and a second pipeline valve 21 disposed on the other side of the liquid storage tank 16 .

[0058] By adopting the above technical solution, when there is no need to perform heat exchange on the refrigerant in the outdoor heat exchanger 4, the coolant in the coolant pipeline 210 can be discharged into the liquid storage tank 16 through the pump body 18. After it is determined that the coolant in the cooling circuit stops flowing into the liquid storage tank 16, the first pipeline valve 20 and the second pipeline valve 21 are closed to realize shutdown water storage, thereby preventing the coolant from being contaminated by the outside world when the air-conditioning system is shut down.

[0059] In some embodiments, the cooling tower 14 is provided with a dust screen (not shown) at the air inlet.

[0060] In some embodiments, the cooling tower 14 is provided with a fan filter (not shown) at the air inlet.

[0061] It can be understood that by setting up a dustproof net, impurities and particulate matter in the air can be filtered, thereby avoiding scaling, corrosion and bacterial growth inside the cooling tower 14 and the coolant pipeline 210; reducing the wear on the cooling tower 14 and the coolant pipeline 210, reducing maintenance costs; and preventing sediment from clogging the air inlet of the cooling tower 14, ensuring smooth air circulation and improving cooling efficiency.

[0062] The cooling tower 14 is provided with a fan at the air inlet, and the fan is used to promote air flow, improve heat exchange efficiency and increase evaporation efficiency. The air flow inside the cooling tower 14 is increased by blowing air through the fan, which helps to accelerate the heat exchange process and make the cooling water dissipate heat faster. Secondly, the fan increases the contact area and contact time between the air and the coolant by increasing the air flow speed, thereby improving the heat exchange efficiency. By setting a fan filter, the air entering the fan is filtered to prevent dust and impurities from entering the fan, protect the fan blades and internal mechanical components, and extend their service life; clean air entering the fan can improve the operating efficiency of the fan and improve the cooling efficiency.

[0063] In some embodiments, the liquid storage tank 16 is provided with a liquid inlet valve assembly 22 which is independent of the coolant pipeline 210 .

[0064] Specifically, the coolant in the liquid storage tank 16 can be replaced, replenished, and added with agents through the liquid inlet valve assembly 22; and the coolant in the liquid storage tank 16 is isolated from the outside air by closing the liquid inlet valve assembly 22.

[0065] Specifically, the liquid replacement process is: control the cooling circuit 200 to stop running, open the liquid inlet valve assembly 22, pump a certain amount of new coolant or a certain proportion of ethylene glycol aqueous solution from the liquid inlet valve assembly 22, and then close the liquid inlet valve assembly 22.

[0066] The process of adding the agent is as follows: the cooling circuit 200 is controlled to stop running, the liquid inlet valve assembly 22 is opened, a fixed amount of the agent is pumped into the filling port of the liquid inlet valve assembly 22, and then the liquid inlet valve assembly 22 is closed. The role of the agent can be to increase the cooling effect of the coolant, or to improve the antifreeze ability of the coolant.

[0067] In some embodiments, the coolant in the coolant pipeline 210 is injected into the cooling tower 14 in a spraying manner.

[0068] Specifically, refer to Figure 1 The cooling tower 14 is an open cooling tower. The coolant pipe 210 located on one side of the outdoor heat exchanger 4 is connected to the cooling tower 14, and the water inlet spray port is deep inside the cooling tower 14; the air outlet of the cooling tower 14 is located at the top of the cooling tower; the water outlet of the cooling tower 14 is located at the bottom and is connected to the filter 15 through the coolant pipe 210. The cooling tower 14 has a built-in fan and is immediately below the air outlet. The spray water inside it is in direct contact with the air in countercurrent for heat exchange.

[0069] It can be understood that the spray coolant in the cooling tower 14 directly contacts the incoming air in the cooling tower 14 for heat exchange, and the heat exchange effect is better.

[0070] refer to Figure 1In some embodiments, the refrigerant circulation loop 100 also includes a reheater 7; the refrigerant pipeline 110 includes a first branch 111 connected to the indoor heat exchanger 1, the reheater 7, the compressor 2 and the outdoor heat exchanger 4, and a second branch 112 connected to the indoor heat exchanger 1, the throttling device 10, the reheater 7 and the outdoor heat exchanger 4; in the reheater 7, the refrigerant in the first branch 111 is used for heat exchange with the refrigerant in the second branch 112.

[0071] It can be understood that by providing the reheater 7 in the refrigerant circulation loop 100, the refrigerant flowing out of the indoor heat exchanger 1 in the first branch 111 will exchange heat with the refrigerant flowing out of the outdoor heat exchanger 4 in the second branch 112 in the reheater to increase the intake superheat of the compressor 2 and the inlet subcooling of the throttling device 10. The heat of the refrigerant in the circulation loop itself passing through the reheater 7 can be reasonably utilized to improve energy utilization efficiency, so that the air conditioner has higher performance.

[0072] The refrigerant circulation loop 100 is divided into two sides: the indoor side and the outdoor side; the indoor side includes: an indoor heat exchanger 1, a compressor 2, an oil separator 3, a heat regenerator 7, a drying filter 8, a sight glass 9, a throttling assembly 10, a first one-way valve 11, and a third pipeline valve 19.

[0073] The outdoor side includes: an outdoor heat exchanger 4 , a refrigerant tank 5 , a fluorine pump 6 , and a second one-way valve 12 ; the cooling circuit 200 is located on the outdoor side and connected to the outdoor heat exchanger 4 .

[0074] Specifically, the indoor heat exchanger 1 is a fin-tube evaporator or a plate-fin evaporator, and the heat exchange fluids on both sides thereof are the refrigerant in the refrigerant pipeline 110 and the indoor air respectively. The refrigerant absorbs heat and evaporates, thereby reducing the temperature of the incoming air.

[0075] The outdoor heat exchanger 4 is a plate type heat exchanger, a shell and tube type heat exchanger or a sleeve type heat exchanger, and the fluids on both sides thereof are respectively the refrigerant in the refrigerant pipeline 110 and the coolant in the coolant pipeline 210; the refrigerant releases heat and condenses, and the coolant absorbs heat and heats up.

[0076] The oil separator 3 is used to separate the high-temperature and high-pressure gas and refrigeration oil discharged from the compressor 2, and includes an inlet and two outlets. The inlet is located on one side of the oil separator 3, and the high-temperature and high-pressure oil-gas mixture compressed by the compressor 2 enters the cavity from here; one of the outlets is located at the top of the oil separator 3, and the separated high-temperature and high-pressure gas is discharged from here and enters the outdoor heat exchanger 4; the other outlet is located at the bottom of the oil separator 3, and the separated high-temperature refrigeration oil flows from here to the compressor 2.

[0077] An oil return circuit is also provided between the oil separator 3 and the compressor 2, and the separated high-temperature refrigeration oil flows back to the compressor 2 through the oil return capillary 13; and an oil return capillary 13 is provided on the oil return circuit, and the oil return capillary 13 is used to transport the high-temperature refrigeration oil separated by the oil separator 3 to the compressor 2 at a certain flow rate. The oil return capillary 13 is located on the outdoor side, and releases heat and cools down on the outdoor side, thereby reducing the overheating damage of the refrigeration oil to the compressor 2. The third pipeline valve 19 is provided on the oil return circuit between the compressor 2 and the oil return capillary 13.

[0078] The throttling device 10 of the present application is an electronic expansion valve, whose main function is to automatically adjust the flow and pressure of the refrigerant entering the indoor heat exchanger 1 according to the indoor temperature and pressure signals, to ensure the normal operation of the air-conditioning system and to make the cooling effect of the air-conditioning system more uniform and stable.

[0079] In some embodiments, the electronic expansion valve PID (proportional (P), integral (I) and differential (D)) is a technology used to accurately control the refrigerant flow in the air conditioning system. When the air conditioning system is running, the PID adjustment method of the electronic expansion valve is:

[0080] E(k)=E(k-1)+△E

[0081] △E=Kpe*[e(k)-e(k-1)]+Kie*e(k)

[0082] Among them, E(k) is the opening of the electronic expansion valve; E(k-1) is the opening of the electronic expansion valve in the previous cycle; △E is the PID calculated adjustment value of the electronic expansion valve opening; e(k) is the difference in suction superheat of compressor 2, that is, the measured suction superheat of compressor 2 - the target suction superheat of compressor 2; e(k-1) is the difference in suction superheat of compressor 2 in the previous cycle; Kpe, Kie are PID adjustment constants of the electronic expansion valve opening, which are determined through debugging.

[0083] Compressor 2 suction superheat = compressor 2 suction temperature - evaporation temperature.

[0084] In some embodiments, the refrigerant circulation loop 100 further includes a fluorine pump 6 , which is connected in series to a second branch 112 between the regenerator 7 and the outdoor heat exchanger 4 .

[0085] The refrigerant circulation loop 100 is specifically divided into three operating modes: compressor mode, mixed mode, and fluorine pump mode.

[0086] In the compressor mode, the refrigerant circulation mode of the refrigerant circulation loop 100 is: compressor 2-oil separator 3-outdoor heat exchanger 4-refrigerant tank 5-second one-way valve 12-drying filter 8-sight glass 9-throttling device 10-indoor heat exchanger 1-compressor 2. At this time, the first one-way valve 11 is disconnected, and the second one-way valve 12 is connected. In the compressor mode, the refrigerant is compressed by the compressor 2 into a high-temperature and high-pressure gas refrigerant, and the refrigerant circulation is driven; the fluorine pump 6 does not operate.

[0087] In the fluorine pump mode, the refrigerant circulation mode of the refrigerant circulation loop 100 is: fluorine pump 6-drying filter 8-sight glass 9-throttling device 10-indoor heat exchanger 1-first one-way valve 11-outdoor heat exchanger 1-refrigerant tank 5-fluorine pump 6. At this time, the first one-way valve 11 is connected and the second one-way valve 12 is disconnected. In the fluorine pump mode, the compressor 2 does not run, the refrigerant is cooled to a supercooled liquid in the outdoor heat exchanger 4 and then flows through the refrigerant tank 5 and enters the fluorine pump 310, and the fluorine pump 6 provides power for the refrigerant circulation. For example, the fluorine pump 6 is a special type of pump, which is mainly used to transport Freon or other refrigerants; it creates a pressure difference to circulate the refrigerant in the system, thereby realizing the transfer and transfer of heat; then, the fluorine pump mode uses natural cold sources to cool down, which is highly efficient and energy-saving, reduces the frequency of use of the compressor 2, and extends its service life.

[0088] In the mixed mode, the refrigerant circulation mode of the refrigerant circulation loop 100 is: compressor 2-oil separator 3-outdoor heat exchanger 4-refrigerant tank 5-fluorine pump 6-drying filter 8-sight glass 9-throttling device 10-indoor heat exchanger 1-compressor 2. At this time, the first one-way valve 11 is disconnected, the second one-way valve 12 is disconnected, the compressor 2 and the fluorine pump 6 are both running, but the compressor 2 runs at a lower frequency, thereby optimizing energy consumption.

[0089] In some embodiments, the air conditioning system further includes a sensor assembly (not shown), which is used to detect the temperature, pressure and flow rate in the refrigerant circulation loop 100 and the cooling loop 200 .

[0090] It can be understood that the temperature, pressure and flow rate at various locations of the air-conditioning system are detected by the sensor components, so as to control the start and stop of each circuit accordingly, and effectively control the stable operation of the air-conditioning system.

[0091] In some embodiments, the present application also provides a control method for starting and stopping the air conditioning system:

[0092] The startup control method of the air conditioning system includes:

[0093] The cooling circuit 200 is running; the first pipeline valve 20 and the second pipeline valve 21 are controlled to be connected, and the liquid valve assembly 22 is closed; after the components of the cooling circuit 200 are ready, the pump body 18 is operated, and the coolant in the coolant pipeline 210 circulates.

[0094] The refrigerant circulation loop 100 is running; the fan at the indoor heat exchanger 1 is started, and the refrigerant circulation loop 100 is started to cool the room.

[0095] During the operation of the air conditioning system, when it is detected that the temperature of the coolant on the outlet side of the outdoor heat exchanger 4 reaches a set temperature difference relative to the initial temperature, the fan in the cooling tower 14 is started to improve the heat exchange efficiency between the coolant and the air.

[0096] In some embodiments of the present application, the air conditioning system determines whether the refrigerant circulation loop 100 adopts the compressor mode, the fluorine pump mode, or the mixed mode for cooling according to the outdoor ambient temperature.

[0097] Specifically, the judgment conditions for the operation of the compressor mode, the mixed mode, and the fluorine pump mode are: the air conditioning system is preset with a compressor start-up temperature and a fluorine pump start-up temperature, and the fluorine pump start-up temperature is less than the compressor start-up temperature;

[0098] When the outdoor wet-bulb temperature is detected to be ≥ the compressor start temperature, the compressor mode is operated;

[0099] When it is detected that the fluorine pump starting temperature is ≤ the outdoor wet bulb temperature < the compressor starting temperature, the mixed mode is operated;

[0100] When it is detected that the outdoor wet-bulb temperature is less than the fluorine pump start temperature, the fluorine pump mode is operated.

[0101] Understandably, when the outdoor temperature is high, such as in summer, the compressor mode is operated for efficient cooling. If the outdoor ambient temperature is slightly lower than the compressor start temperature and higher than the fluorine pump start temperature, the air conditioning system will adopt a mixed mode, that is, the compressor and the fluorine pump work at the same time, but the compressor runs at a lower frequency, thereby optimizing energy consumption. When the outdoor temperature is low, such as in winter, the fluorine pump mode is operated to use natural cold sources for cooling and achieve efficient energy saving.

[0102] In some embodiments, the startup control method under the compressor mode is: run compressor 2; adjust the opening of the electronic expansion valve to control the suction superheat of compressor 2 to a1°C; determine that the exhaust pressure of compressor 2 - the suction pressure of compressor 2 ≥ b1bar, and open the third pipeline valve 19.

[0103] In some other embodiments, the startup control method in the mixed mode is: run the compressor 2, run the fluorine pump 6; adjust the opening of the electronic expansion valve, control the suction superheat of the compressor 2 to be a2°C; judge that the exhaust pressure of the compressor 2 - the suction pressure of the compressor 2 ≥ b2bar, and open the third pipeline valve 19.

[0104] In some other embodiments, the startup control method in the fluorine pump mode is: adjusting the opening of the electronic expansion valve; and running the fluorine pump 6.

[0105] The parameter values ​​of a1, a2, b1, and b2 are determined by the actual system debugging setting values.

[0106] The shutdown control methods of the air conditioning system include:

[0107] Turn off the fan of the cooling tower 14; control the refrigerant circulation loop 100 to stop running, and turn off the fan at the indoor heat exchanger 1; finally, turn off the pump body 18 and stop the water storage.

[0108] In some embodiments, the shutdown control method in the compressor mode is: closing the third pipeline valve 11, closing the compressor 2, and adjusting the opening of the electronic expansion valve to 50 steps.

[0109] In some other embodiments, the shutdown control method in the mixed mode is: closing the third pipeline valve 11, closing the fluorine pump 6, closing the compressor 2, and adjusting the opening of the electronic expansion valve to 50 steps.

[0110] In other embodiments, the shutdown control method in the fluorine pump mode is: turning off the fluorine pump 6 and adjusting the opening of the electronic expansion valve to 50 steps.

[0111] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An air conditioning system, characterized in that: include: A refrigerant circulation loop, including a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected by a refrigerant pipeline; The cooling circuit includes a cooling tower, a filter, a liquid storage tank and a pump body connected to the outdoor heat exchanger through a coolant pipeline; in the outdoor heat exchanger, the coolant pipeline is used for heat exchange with the refrigerant pipeline.

2. The air conditioning system according to claim 1, characterized in that: The liquid storage tank is provided with a heating device, and the heating device is used to heat the cooling water in the liquid storage tank.

3. The air conditioning system according to claim 1, characterized in that: The filter is arranged between the cooling tower and the liquid storage tank, and the liquid storage tank is arranged at the lowest point of the cooling circuit in the gravity direction.

4. The air conditioning system according to claim 3, characterized in that: The coolant pipeline is provided with pipeline valves at both ends of the liquid storage tank.

5. The air conditioning system according to claim 1, characterized in that: The cooling tower is provided with a dust screen and / or a fan filter screen at the air inlet.

6. The air conditioning system according to claim 1 or 2, characterized in that: The liquid storage tank is provided with a liquid inlet valve assembly which is independent of the coolant pipeline.

7. The air conditioning system according to claim 1, characterized in that: The coolant in the coolant pipeline is injected into the cooling tower in a spraying manner.

8. The air conditioning system according to claim 1, characterized in that: The refrigerant circulation loop also includes a reheater; the refrigerant pipeline includes a first branch connected to the indoor heat exchanger, the reheater, the compressor and the outdoor heat exchanger, and a second branch connected to the indoor heat exchanger, the throttling device, the reheater and the outdoor heat exchanger; in the reheater, the refrigerant in the first branch is used for heat exchange with the refrigerant in the second branch.

9. The air conditioning system according to claim 8, characterized in that: The refrigerant circulation loop also includes a fluorine pump, which is connected in series on the second branch between the regenerator and the outdoor heat exchanger. The refrigerant circulation loop has a compressor mode, a mixed mode and a fluorine pump mode.

10. The air conditioning system according to any one of claims 1 to 9, characterized in that: The air conditioning system further comprises a sensor assembly, and the sensor assembly is used to detect the temperature, pressure and flow in the refrigerant circulation loop and the cooling loop.

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