Single-connected or multi-connected air-cooled double-cold-source fluorine pump energy-saving air conditioning system

Abstract

The utility model provides a single-connected or multi-connected air-cooled double-cold-source fluorine pump energy-saving air-conditioning system, which comprises indoor units and outdoor units, the indoor units are arranged among rows of cabinets or air-conditioning rooms, and the outdoor units are arranged outside a machine room. According to the single-connected or multi-connected air-cooled double-cold-source fluorine pump energy-saving air conditioner, a single-connected mode can be adopted, and one outdoor unit and one indoor unit are installed in a one-to-one mode to form a refrigerating system; a multi-connection mode can also be adopted, and one outdoor unit is used for dragging a plurality of indoor units; an air-cooling double-cold-source cooling mode is adopted, compressor mechanical refrigeration and fluorine pump natural cold source refrigeration can be combined, the annual energy efficiency ratio of an air conditioning system is greatly increased, and overall energy saving of a machine room is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of heat removal in a high-density heat dissipation room, and relates to a double-cold-source fluorine pump energy-saving air conditioner, in particular to a single-joint or multi-joint air-cooled double-cold-source fluorine pump energy-saving air conditioner system. Background Art

[0002] In modern data centers and computer rooms, servers, storage devices and other IT equipment continuously generate a lot of heat during operation, resulting in a high ambient temperature inside the computer room. Therefore, special air conditioning equipment is needed to maintain the temperature inside the computer room, accurately control and adjust the internal environment of the computer room, and ensure that the equipment operates within a suitable temperature and humidity range. The electricity consumption of air conditioning equipment in the computer room accounts for a large proportion of the overall energy consumption. In the context of advocating energy conservation and reducing carbon emissions, some regions have formulated PUE limit policies for new and renovated data centers. How to achieve energy conservation in the computer room air conditioning system and reduce the overall PUE value of the data center has become the focus of industry attention.

[0003] At present, the existing energy efficiency optimization strategy technologies for computer room air conditioners mainly include several technical paths such as fresh air cooling, plate air heat exchange, and active optimization based on energy efficiency control. Among them, fresh air cooling technology is to introduce outdoor fresh air to cool the equipment in the computer room when the outdoor temperature is cooler in the transition season or winter. Although this technology can directly utilize outdoor natural cold sources and does not require additional refrigeration equipment, it can theoretically significantly reduce the cooling energy consumption of the computer room. However, the solution of directly introducing outdoor air is difficult to meet the air cleanliness and humidity control requirements in the computer room, and it causes great damage to the maintenance structure of the computer room. When the fresh air system stops working, there is a hidden danger of air leakage, which causes indoor cooling loss when the weather is hot. Filters need to be installed at the inlet and outlet of the fresh air system, and the filters not only increase the wind resistance of the system, but also need to be replaced frequently, which requires a lot of maintenance.

[0004] Plate air heat exchange technology uses plate air heat exchangers to introduce cold outdoor air into the room during the transition season or in winter when the outdoor temperature is cooler. This technology isolates indoor and outdoor air, avoiding air cleanliness and humidity control problems caused by directly introducing outdoor air. However, since the heat exchanger uses a honeycomb structure, the air flow channel is easily blocked by dust, so filters need to be installed at the inlet and outlet of the outdoor air flow channel, which requires a lot of maintenance.

[0005] Active optimization technology based on energy efficiency control is to improve the annual energy efficiency ratio of the traditional computer room precision air-conditioning system through a comprehensive energy efficiency indoor control unit, dynamically adjust the operating parameters of the air-conditioning equipment to adapt to the load changes and environmental conditions in the computer room, so as to maintain high energy efficiency under different operating conditions. Specifically, the system can automatically adjust the cooling capacity, air volume and other related parameters by real-time monitoring of the computer room temperature, humidity and equipment load. However, although this technology has improved the operating efficiency of the air-conditioning system to a certain extent, the overall energy saving is limited and cannot significantly reduce the PUE value of the data center.

[0006] In summary, the current computer room air conditioning system still faces many technical challenges in terms of energy saving. How to effectively combine the two different cooling source technologies of compressor cooling and natural cooling source cooling under the premise of meeting the strict environmental requirements in the computer room, realize the complementary advantages of the two, maximize the annual energy efficiency ratio of the air conditioning system, and thus significantly reduce the overall energy consumption of the computer room, is a technical problem that needs to be solved urgently. Utility Model Content

[0007] 1. Technical issues

[0008] In view of the deficiencies and characteristics of existing technologies and the PUE limit requirements of data centers, the utility model proposes a single- or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air-conditioning system, which adopts an air-cooled dual-cold-source cooling method, and can combine the mechanical refrigeration of the compressor and the natural cold source refrigeration of the fluorine pump to achieve complementary advantages between the two, greatly improve the energy efficiency ratio of the air-conditioning system throughout the year, thereby significantly reducing the overall energy consumption of the computer room and achieving overall energy saving in the computer room.

[0009] (II) Technical solution

[0010] The technical solution adopted by the utility model to solve its technical problems is:

[0011] A single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air conditioning system, used for effective temperature control in a closed space such as a data center air-conditioning room or a computer room, includes an indoor unit and an outdoor unit, wherein:

[0012] The indoor unit is used to absorb indoor heat and control indoor temperature through an evaporation process, and at least includes an indoor sheet metal shell and an evaporator and an indoor fan arranged in the indoor sheet metal shell;

[0013] The outdoor unit is used to release the heat taken out from the indoor unit through the condensation process and provide the circulation of the refrigerant, and at least includes an outdoor sheet metal shell and a condenser, an outdoor fan, a compressor, an expansion valve, a fluorine pump and a liquid storage tank arranged in the outdoor sheet metal shell;

[0014] The evaporator in the indoor unit and the compressor, condenser, liquid storage tank, fluorine pump and expansion valve in the outdoor unit are sequentially connected through pipelines to form a closed refrigeration circuit, and the compressor is connected in parallel with a bypass pipeline I, and the liquid storage tank and fluorine pump are connected in parallel with a bypass pipeline II;

[0015] The air conditioning system adopts a single-connection mode or a multi-connection mode. When the single-connection mode is adopted, one outdoor unit and one indoor unit are installed one-to-one to form a refrigeration system. When the multi-connection mode is adopted, one outdoor unit drives N indoor units to form a refrigeration system, and N≥2.

[0016] Preferably, the indoor unit is installed in an air-conditioning room or a machine room in the form of a vertical cabinet unit, or is installed between cabinets in a row in the form of a row air conditioner, or is installed on the top of a passage between two rows of cabinets in the form of a ceiling air conditioner.

[0017] Preferably, an air filter is optionally provided in the indoor sheet metal shell of the indoor unit. The air filter is installed on the return air side of the evaporator to filter dust and impurities in the indoor return air entering the evaporator, thereby improving the air quality and the operating efficiency of the system.

[0018] Preferably, the working modes of the outdoor unit include a fluorine pump natural cold source refrigeration mode, a fluorine pump natural cold source refrigeration and compressor refrigeration mixed mode, and a compressor refrigeration mode, and control valves are provided on the bypass pipeline I and the bypass pipeline II for opening or closing the corresponding bypass pipeline according to the working mode of the outdoor unit, thereby realizing the switching of the refrigerant flow circuit under different working modes.

[0019] Furthermore, when the outdoor temperature is low and the natural cold source meets the conditions, the air-conditioning system operates in the fluorine pump natural cold source refrigeration mode. At this time, only the fluorine pump is started, and the compressor is not started. The bypass line I is opened and the bypass line II is closed. After the liquid refrigerant in the evaporator absorbs the heat from the indoor return air and evaporates, it enters the condenser of the outdoor unit through the bypass line I and is condensed into liquid refrigerant using the natural cold source. After the liquid refrigerant enters the liquid storage tank, it is driven by the fluorine pump to flow back to the evaporator to continue absorbing heat and evaporating.

[0020] Furthermore, when the outdoor environment is in the transitional season, the air-conditioning system operates in a mixed mode of fluorine pump natural cold source refrigeration and compressor refrigeration. At this time, the fluorine pump and the compressor are started, and the bypass pipe I and the bypass pipe II are opened. The liquid refrigerant in the evaporator absorbs the heat from the indoor return air and evaporates, then passes through the compressor and the bypass pipe I and enters the condenser for condensation. The condensed liquid refrigerant enters the liquid storage tank one way and then runs through the fluorine pump for boosting assistance, and enters the bypass pipe II another way and then passes into the expansion valve. After throttling by the expansion valve, it flows back to the evaporator to continue absorbing heat and evaporating.

[0021] Furthermore, when the outdoor temperature is high, the air conditioning system operates in the compressor cooling mode. At this time, only the compressor is started, and the fluorine pump is not started. The bypass line II is opened and the bypass line I is closed. At this time, the liquid refrigerant in the evaporator absorbs the heat from the indoor return air and evaporates, then passes through the compressor and enters the condenser for condensation. The condensed liquid refrigerant passes through the bypass line II and enters the expansion valve for throttling, and then flows back to the evaporator to continue absorbing heat and evaporating.

[0022] Preferably, the air conditioning system is further provided with an indoor control unit and an outdoor control unit, wherein:

[0023] The indoor control unit at least includes a controller I disposed on the indoor sheet metal shell and a temperature sensor disposed at the air inlet and air outlet of the indoor sheet metal shell and connected to the controller I in communication, and the controller I is also connected to the indoor fan in communication;

[0024] The outdoor control unit at least includes a controller II disposed on an outdoor sheet metal housing and a temperature sensor disposed at an air inlet of the outdoor sheet metal housing and communicatively connected to the controller II, and the controller II is at least also communicatively connected to an outdoor fan;

[0025] The controller I and controller II control the operating state of the indoor fan, the operating state of the outdoor fan and the working mode of the outdoor unit at least according to the detected inlet and outlet temperature parameters of the indoor unit and the inlet temperature of the outdoor unit.

[0026] Furthermore, the indoor control unit also includes a pressure sensor arranged at the refrigerant inlet and / or refrigerant outlet of the evaporator and communicatively connected to the controller I, and the outdoor control unit also includes a pressure sensor arranged at the refrigerant inlet and / or refrigerant outlet of the condenser and communicatively connected to the controller II. The controllers I and II determine whether the refrigeration circuit is under low pressure or high pressure based on the refrigerant pressure difference between the indoor unit and the outdoor unit.

[0027] Furthermore, a humidification module and a humidity sensor arranged at the air inlet of the indoor sheet metal shell are optionally provided in the indoor sheet metal shell of the indoor unit. The humidification module and the humidity sensor are both communicatively connected with the controller I. The controller I determines whether the humidification module needs to be turned on according to the detected indoor unit inlet air humidity parameters.

[0028] Furthermore, the indoor control unit also includes a display that is communicatively connected to the controller I, and the display is used to display the operating status parameters of the system.

[0029] (III) Technical Effect

[0030] It can be seen from the above technical solutions that the single-link or multi-link air-cooled dual-cold-source fluorine pump energy-saving air conditioning system of the utility model has at least the following significant technical effects:

[0031] (1) The single-link or multi-link air-cooled dual-cold-source fluorine pump energy-saving air conditioning system of the present invention adopts a flexible installation method. It can adopt a single-link method, where one outdoor unit and one indoor unit are installed one-to-one to form a refrigeration system, which is suitable for the temperature control needs of a smaller-scale computer room or a specific area; it can also adopt a multi-link method, where one outdoor unit drags multiple indoor units, which is suitable for large data centers or complex environments that require zoning control. This flexibility allows the system to meet the refrigeration needs of data centers of different sizes and can adapt to various application scenarios.

[0032] (2) The single- or multi-connected air-cooled dual-cold-source fluorine pump energy-saving air-conditioning system of the present invention adopts an air-cooled dual-cold-source cooling method, which can combine the mechanical refrigeration of the compressor and the natural cold source refrigeration of the fluorine pump. It not only utilizes the advantages of the compressor in efficient refrigeration, but also makes full use of the natural cold source in the low temperature season to realize the natural cold source refrigeration of the fluorine pump. This combination greatly improves the energy efficiency ratio of the air-conditioning system throughout the year, so that the system can maintain efficient operation in different seasons and climatic conditions, and realizes the overall energy saving of the computer room.

[0033] (3) The air conditioning system of the present invention can monitor indoor and outdoor environmental parameters in real time and adjust the operating state of the system through the temperature sensor, humidity sensor and pressure sensor in the control system. The control system can intelligently switch between the fluorine pump natural cold source refrigeration mode, the fluorine pump natural cold source refrigeration and compressor refrigeration mixed mode, and the compressor refrigeration mode to ensure that the most energy-saving operating mode can be selected under any environmental conditions. This flexible control method not only improves the operating efficiency of the system, but also extends the service life of the equipment and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a single- or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air-conditioning system of the utility model.

[0035] Figure 2 This is a working principle diagram of the single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air-conditioning system of the utility model when only the fluorine pump natural cold source refrigeration mode is adopted.

[0036] Figure 3 The utility model is a working principle diagram of a single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air-conditioning system adopting a mixed mode of fluorine pump natural cold source refrigeration and compressor refrigeration.

[0037] Figure 4 This is a working principle diagram of the single- or multi-connected air-cooled dual-cold-source fluorine pump energy-saving air-conditioning system of the utility model when the compressor refrigeration mode is adopted.

[0038] Description of reference numerals:

[0039] Indoor unit 1, evaporator 1-1, indoor fan 1-2, air filter 1-3, indoor control unit 1-4, display 1-4-1, controller I 1-4-2, indoor sheet metal shell 1-5, outdoor unit 2, condenser 2-1, outdoor fan 2-2, compressor 2-3, expansion valve 2-4, fluorine pump 2-5, liquid storage tank 2-6, outdoor sheet metal shell 2-7, outdoor control unit 2-8, controller II 2-8-1, bypass pipe I 3, bypass pipe II 4. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail with reference to the accompanying drawings and examples. In the accompanying drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the utility model, not all of them, and are intended to be used to explain the utility model, but should not be understood as limitations on the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0041] Example 1

[0042] Figure 1 This is a schematic diagram of the structure of the single- or multi-connected air-cooled dual-cold-source fluorine pump energy-saving air conditioning system of the utility model. Figure 1 As shown, the single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air conditioner of the utility model comprises an indoor unit 1 and an outdoor unit 2, wherein the indoor unit 1 comprises an evaporator 1-1, an indoor fan 1-2, an air filter 1-3, an indoor control unit 1-4, an indoor sheet metal shell 1-5, etc.; the evaporator 1-1, the indoor fan 1-2, the air filter 1-3, the indoor control unit 1-4, etc. are installed in the indoor sheet metal shell 1-5; the air filter 1-3 is installed on the return air side of the evaporator 1-1; the outdoor unit 2 comprises a condenser 2-1, an outdoor fan 2-2, a compressor 2-3, an expansion valve 2- 4, fluorine pump 2-5, liquid storage tank 2-6, outdoor sheet metal shell 2-7, outdoor control unit 2-8, etc.; condenser 2-1, outdoor fan 2-2, compressor 2-3, expansion valve 2-4, fluorine pump 2-5, liquid storage tank 2-6, outdoor control unit 2-8, etc. are installed in the outdoor sheet metal shell 2-7; evaporator 1-1, compressor 2-3, condenser 2-1, liquid storage tank 2-6, fluorine pump 2-5, expansion valve 2-4 are connected in sequence through pipelines to form a refrigeration system; compressor 2-3 is connected in parallel with bypass pipeline Ⅰ3, and liquid storage tank 2-6 and fluorine pump 2-5 are connected in parallel with bypass pipeline Ⅱ4.

[0043] The single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air-conditioning system of the utility model adopts a single-joint mode or a multi-joint mode. When the single-joint mode is adopted, one outdoor unit 2 and one indoor unit 1 are installed one-to-one to form a refrigeration system; when the multi-joint mode is adopted, one outdoor unit 2 drives N indoor units 1, and at this time N≥2.

[0044] In some preferred embodiments, the indoor unit 1 can be installed in an air-conditioned room or a machine room in the form of a vertical cabinet, or installed between cabinets in a row in the form of an inter-row air conditioner, or installed on the top of a passage between two rows of cabinets in the form of a top-mounted air conditioner. These installation methods can be flexibly selected according to the layout and cooling requirements of different data centers or machine rooms to ensure the best cooling effect and space utilization. At the same time, these methods are also easy to maintain and operate, and improve the overall efficiency and reliability of the system.

[0045] In some preferred embodiments, the air-conditioning system is further provided with an indoor control unit and an outdoor control unit, wherein: the indoor control unit 1-4 includes a display 1-4-1, a controller Ⅰ1-4-2, a temperature sensor, a humidity sensor, a pressure sensor, etc., and the outdoor control unit 2-8 includes a controller Ⅱ2-8-1, a temperature sensor, a pressure sensor, etc.; the display 1-4-1 can display the system operation status parameters, the controller Ⅰ1-4-2 and the controller Ⅱ2-8-1 can control the operation status of the indoor fan 1-2, the operation status of the outdoor fan 2-2 and the working mode of the outdoor unit 2 according to the detected inlet and outlet temperature parameters of the indoor unit 1 and the inlet temperature of the outdoor unit 2; the controller Ⅰ1-4-2 and the controller Ⅱ2-8-1 can determine whether the refrigeration system is under low pressure or under high pressure according to the pressure difference alarm signal of the indoor unit 1 and the outdoor unit 2.

[0046] In some preferred embodiments, the indoor unit 1 may be optionally equipped with a humidification function. A humidification module and a humidity sensor are optionally provided in the indoor sheet metal shell of the indoor unit 1 at the air inlet of the indoor sheet metal shell. The humidification module and the humidity sensor are both communicatively connected with the controller I. The controller I determines whether the humidification module needs to be turned on based on the detected indoor unit air inlet humidity parameters.

[0047] In some preferred examples, the working modes of the outdoor unit 2 include fluorine pump natural cold source refrigeration mode, fluorine pump natural cold source refrigeration and compressor refrigeration mixed mode, and compressor refrigeration mode, and control valves are provided on bypass pipe I and bypass pipe II for opening or closing the corresponding bypass pipe according to the working mode of the outdoor unit, thereby realizing the switching of the refrigerant flow circuit under different working modes.

[0048] Example 2

[0049] Figure 2 This is a working principle diagram of the utility model's single-joint or multi-joint air-cooled dual-cold source fluorine pump energy-saving air conditioning system when only the fluorine pump natural cold source refrigeration mode is used. Figure 2 As shown, when the outdoor temperature is low and the natural cold source meets the conditions, only the fluorine pump natural cold source cooling mode is started. At this time, only the low-power fluorine pump 2-5 is started, and the compressor cooling mode is not started. The bypass line I is opened and the bypass line II is closed. At this time, the liquid refrigerant in the evaporator 1-1 of the indoor unit 1 absorbs the heat from the indoor return air and evaporates. Then, it enters the condenser 2-1 of the outdoor unit 2 through the bypass line I3 and is condensed into refrigerant liquid by the natural cold source. After the refrigerant liquid enters the liquid storage tank 2-6, it is driven by the fluorine pump 2-5 to the liquid pipe and flows back to the evaporator 1-1 to continue absorbing heat and evaporating, thereby transferring the indoor return air heat out of the machine room.

[0050] At this time, the flow direction of refrigerant in the system is shown by arrow A in the figure; the flow direction of return and supply air of indoor top-return and bottom-supply cabinet units is shown by arrow B in the figure; the flow direction of return and supply air of indoor front-air-in and back-out row air conditioners is shown by arrow C in the figure; the flow direction of return and supply air of indoor both-side return and bottom-supply ceiling air conditioners is shown by arrow D in the figure; the flow direction of outdoor intake and exhaust air is shown by arrow E in the figure.

[0051] Example 3

[0052] Figure 3 This is a working principle diagram of the utility model's single-joint or multi-joint air-cooled dual-cold source fluorine pump energy-saving air conditioning system when the fluorine pump natural cold source refrigeration and compressor refrigeration mixed mode is adopted. Figure 3 As shown, when the outdoor is in the transition season, the system runs the mixed mode of fluorine pump natural cold source refrigeration and compressor refrigeration. At this time, the bypass pipeline I and bypass pipeline II are opened, and the low-power fluorine pump 2-5 boosting system is started to assist the operation of compressor 2-3, reduce the system condensing temperature, reduce the power consumption of compressor 2-3, and improve the energy efficiency ratio of the whole machine. At this time, the liquid refrigerant in the evaporator 1-1 of the indoor unit 1 absorbs the heat from the indoor return air and evaporates, and then enters the compressor 2-3 and bypass pipeline I3 through the air pipe and enters the condenser 2-1 of the outdoor unit 2 for condensation. The condensed refrigerant liquid enters the liquid storage tank 2-6 at the same time, and then passes through the fluorine pump 2-5 boosting auxiliary operation and bypass pipeline II4, and then throttles through the expansion valve 2-4 and flows back to the evaporator 1-1 to continue absorbing heat and evaporating, thereby transferring the indoor return air heat out of the machine room.

[0053] At this time, the flow direction of refrigerant in the system is shown by arrow F in the figure; the flow direction of return and supply air of indoor top-return and bottom-supply cabinet units is shown by arrow B in the figure; the flow direction of return and supply air of indoor front-air-in and back-out row air conditioners is shown by arrow C in the figure; the flow direction of return and supply air of indoor both-side return and bottom-supply ceiling air conditioners is shown by arrow D in the figure; the flow direction of outdoor intake and exhaust air is shown by arrow E in the figure.

[0054] Example 4

[0055] Figure 4 This is a working principle diagram of the single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air conditioning system of the utility model when the compressor refrigeration mode is adopted. Figure 4 As shown, when the outdoor temperature is high, the system operates in the compressor cooling mode. At this time, only the compressor is started, and the fluorine pump is not started. The bypass line II is opened and the bypass line I is closed. The liquid refrigerant in the evaporator 1-1 of the indoor unit 1 absorbs the heat from the indoor return air and evaporates. It enters the compressor 2-3 through the air pipe to increase the temperature and pressure, and then enters the condenser 2-1 of the outdoor unit 2 for condensation. The condensed refrigerant liquid enters the bypass line II4 and is throttled by the expansion valve 2-4 before returning to the evaporator 1-1 to continue absorbing heat and evaporating, thereby transferring the indoor return air heat out of the machine room.

[0056] At this time, the flow direction of refrigerant in the system is shown by arrow G in the figure; the flow direction of return and supply air of indoor top-return and bottom-supply cabinet units is shown by arrow B in the figure; the flow direction of return and supply air of indoor front-air-in and back-out row air conditioners is shown by arrow C in the figure; the flow direction of return and supply air of indoor both-side return and bottom-supply ceiling air conditioners is shown by arrow D in the figure; the flow direction of outdoor intake and exhaust air is shown by arrow E in the figure.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A single- or multi-connected air-cooled dual-cold-source fluorine pump energy-saving air conditioning system, comprising an indoor unit and an outdoor unit, characterized in that: The indoor unit is used to absorb indoor heat and control indoor temperature through an evaporation process, and at least includes an indoor sheet metal shell and an evaporator and an indoor fan arranged in the indoor sheet metal shell; The outdoor unit is used to release the heat taken out from the indoor unit through the condensation process and provide the circulation of the refrigerant, and at least includes an outdoor sheet metal shell and a condenser, an outdoor fan, a compressor, an expansion valve, a fluorine pump and a liquid storage tank arranged in the outdoor sheet metal shell; The evaporator in the indoor unit and the compressor, condenser, liquid storage tank, fluorine pump and expansion valve in the outdoor unit are sequentially connected through pipelines to form a closed refrigeration circuit, and the compressor is connected in parallel with a bypass pipeline I, and the liquid storage tank and fluorine pump are connected in parallel with a bypass pipeline II; The air conditioning system adopts a single-connection mode or a multi-connection mode. When the single-connection mode is adopted, one outdoor unit and one indoor unit are installed one-to-one to form a refrigeration system. When the multi-connection mode is adopted, one outdoor unit drives N indoor units to form a refrigeration system, and N≥2.

2. The single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air conditioning system according to claim 1, characterized in that: The indoor unit is installed in an air-conditioning room or a machine room in the form of a vertical cabinet, or installed between cabinets in a row in the form of an inter-row air conditioner, or installed on the top of a passage between two rows of cabinets in the form of a ceiling air conditioner.

3. The single-connected or multi-connected air-cooled dual-cold-source fluorine pump energy-saving air conditioning system according to claim 1, characterized in that: An air filter is optionally provided in the indoor sheet metal housing of the indoor unit. The air filter is installed on the return air side of the evaporator to filter dust and impurities in the indoor return air entering the evaporator, thereby improving the air quality and the operating efficiency of the system.

4. The single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air conditioning system according to claim 1, characterized in that: The working modes of the outdoor unit include a fluorine pump natural cold source refrigeration mode, a fluorine pump natural cold source refrigeration and compressor refrigeration mixed mode, and a compressor refrigeration mode, and control valves are provided on the bypass pipeline I and the bypass pipeline II for opening or closing the corresponding bypass pipeline according to the working mode of the outdoor unit, thereby realizing the switching of the refrigerant flow circuit under different working modes.

5. The single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air conditioning system according to claim 4, characterized in that: When the outdoor temperature is low and the natural cold source meets the conditions, the air conditioning system operates in the fluorine pump natural cold source refrigeration mode. At this time, only the fluorine pump is started, and the compressor is not started. The bypass line I is opened and the bypass line II is closed. After the liquid refrigerant in the evaporator absorbs the heat from the indoor return air and evaporates, it enters the condenser of the outdoor unit through the bypass line I and is condensed into liquid refrigerant using the natural cold source. After the liquid refrigerant enters the liquid storage tank, it is driven by the fluorine pump to flow back to the evaporator to continue absorbing heat and evaporating.

6. The single-connected or multi-connected air-cooled dual-cold-source fluorine pump energy-saving air conditioning system according to claim 4, characterized in that: When the outdoor environment is in the transitional season, the air conditioning system operates in a mixed mode of fluorine pump natural cold source refrigeration and compressor refrigeration. At this time, the fluorine pump and the compressor are started, and the bypass pipe I and bypass pipe II are opened. The liquid refrigerant in the evaporator absorbs the heat from the indoor return air and evaporates, then passes through the compressor and bypass pipe I and enters the condenser for condensation. The condensed liquid refrigerant enters the liquid storage tank one way and then runs through the fluorine pump for boosting assistance, and enters the bypass pipe II another way and then enters the expansion valve. After throttling by the expansion valve, it flows back to the evaporator to continue absorbing heat and evaporating.

7. The single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air conditioning system according to claim 4, characterized in that: When the outdoor temperature is high, the air conditioning system runs in the compressor cooling mode. At this time, only the compressor is started, and the fluorine pump is not started. The bypass line II is opened and the bypass line I is closed. At this time, the liquid refrigerant in the evaporator absorbs the heat from the indoor return air and evaporates, then passes through the compressor and enters the condenser for condensation. The condensed liquid refrigerant passes through the bypass line II and enters the expansion valve for throttling, then flows back to the evaporator to continue absorbing heat and evaporating.

8. The single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air conditioning system according to claim 1, characterized in that: The air conditioning system is also provided with an indoor control unit and an outdoor control unit, wherein: The indoor control unit at least includes a controller I disposed on the indoor sheet metal shell and a temperature sensor disposed at the air inlet and air outlet of the indoor sheet metal shell and connected to the controller I in communication, and the controller I is also connected to the indoor fan in communication; The outdoor control unit at least includes a controller II disposed on an outdoor sheet metal housing and a temperature sensor disposed at an air inlet of the outdoor sheet metal housing and communicatively connected to the controller II, and the controller II is at least also communicatively connected to an outdoor fan; The controller I and controller II control the operating state of the indoor fan, the operating state of the outdoor fan and the working mode of the outdoor unit at least according to the detected inlet and outlet temperature parameters of the indoor unit and the inlet temperature of the outdoor unit.

9. The single-joint or multi-joint air-cooled dual-cold-source fluorine pump energy-saving air conditioning system according to claim 8, characterized in that: The indoor control unit also includes a pressure sensor arranged at the refrigerant inlet and / or refrigerant outlet of the evaporator and communicated with the controller I. The outdoor control unit also includes a pressure sensor arranged at the refrigerant inlet and / or refrigerant outlet of the condenser and communicated with the controller II. The controllers I and II determine whether the refrigeration circuit is under low pressure or high pressure based on the refrigerant pressure difference between the indoor unit and the outdoor unit.

10. The single-connected or multi-connected air-cooled dual-cold-source fluorine pump energy-saving air conditioning system according to claim 8, characterized in that: A humidification module and a humidity sensor arranged at the air inlet of the indoor sheet metal shell are optionally provided in the indoor sheet metal shell of the indoor unit. The humidification module and the humidity sensor are both communicatively connected with the controller I. The controller I determines whether the humidification module needs to be turned on based on the detected indoor unit inlet air humidity parameters.

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