Air conditioning system and control method

Abstract

The present disclosure relates to an air conditioning system and control method. The air conditioning system includes: a compressor; at least two indoor heat exchangers; an outdoor heat exchanger; a first flow path and a second flow path connected in parallel; wherein the first flow path fluidly connects the compressor outlet, the outdoor heat exchanger, and at least one indoor heat exchanger; the second flow path fluidly connects the compressor outlet and at least one indoor heat exchanger; the first flow path and the second flow path are configured to operate selectively or simultaneously; an enthalpy increase pipeline, the first end of which is connected to the pipeline between the outdoor heat exchanger and the at least one indoor heat exchanger, and the second end is connected to the enthalpy increase port of the compressor; and a regulating valve provided on the enthalpy increase pipeline, the regulating valve being configured to regulate the on-off and flow rate of the enthalpy increase pipeline. The air conditioning system includes full cooling, full heating, main cooling, and main heating modes. In these modes, the regulating valve can be selectively opened to connect the enthalpy increase pipeline to achieve enthalpy increase of the compressor, thereby improving the energy efficiency and performance of the compressor.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to an air conditioning system and a control method thereof. Background Art

[0002] Compared with heat pump multi-split systems, heat recovery multi-split systems have more functional modes. In some related technologies, heat recovery multi-split systems use non-enthalpy-increasing compressors, which have problems such as average energy efficiency, average energy saving, high exhaust temperature, and few control methods. Summary of the Invention

[0003] Some embodiments of the present disclosure provide an air conditioning system and a control method for alleviating the problem of low energy efficiency.

[0004] In one aspect of the present disclosure, there is provided an air conditioning system, comprising:

[0005] compressor;

[0006] At least two indoor heat exchangers;

[0007] outdoor heat exchanger;

[0008] A first flow path and a second flow path connected in parallel; wherein the first flow path fluidly connects the compressor outlet, the outdoor heat exchanger, and at least one indoor heat exchanger; the second flow path fluidly connects the compressor outlet and at least one indoor heat exchanger; the first flow path and the second flow path are configured to work selectively or simultaneously;

[0009] an enthalpy-increasing pipeline, a first end of which is connected to a pipeline between the outdoor heat exchanger and at least one indoor heat exchanger, and a second end of which is connected to an enthalpy-increasing port of the compressor; and

[0010] The regulating valve is provided in the enthalpy increasing pipeline, and the regulating valve is configured to adjust the on-off and flow rate of the enthalpy increasing pipeline.

[0011] In some embodiments, the air conditioning system also includes a third flow path and a fourth flow path in parallel, wherein the third flow path fluid connects at least one indoor heat exchanger and the inlet of the compressor, and the fourth flow path fluid connects at least one indoor heat exchanger, the outdoor heat exchanger and the inlet of the compressor, and the third flow path and the fourth flow path are configured to work selectively or simultaneously.

[0012] In some embodiments, the air-conditioning system further includes a conversion unit, in which at least one indoor heat exchanger is an indoor condenser and at least one indoor heat exchanger is an indoor evaporator, the refrigerant of the indoor evaporator flows to the indoor condenser through the conversion unit, or the refrigerant of the indoor condenser flows to the indoor evaporator through the conversion unit.

[0013] In some embodiments, the air-conditioning system further includes a liquid storage component, a pressurizing valve and a first pipeline, wherein the liquid storage component is arranged on the pipeline between the outdoor heat exchanger and at least one indoor heat exchanger, the first end of the first pipeline is connected to the outlet of the compressor, the second end of the first pipeline is connected to the liquid storage component, and the pressurizing valve is arranged on the first pipeline.

[0014] In some embodiments, the air conditioning system further includes a subcooler, which is disposed on a pipeline between the outdoor heat exchanger and at least one indoor heat exchanger, and the first end of the enthalpy increase pipeline is connected to the subcooler.

[0015] In some embodiments, the air-conditioning system further includes a liquid storage component, a pressurizing valve and a first pipeline, wherein the liquid storage component is arranged on the pipeline between the outdoor heat exchanger and the subcooler, the first end of the first pipeline is connected to the outlet of the compressor, the second end of the first pipeline is connected to the liquid storage component, and the pressurizing valve is arranged on the first pipeline.

[0016] In some embodiments, the air-conditioning system further includes a second pipeline, a third pipeline, a fourth pipeline and a fifth pipeline, the subcooler includes a first branch and a second branch, the first end of the first branch is connected to the liquid storage component through the second pipeline, and the second end of the first branch is connected to at least one indoor heat exchanger through the third pipeline; the first end of the second branch is connected to the liquid storage component through the fourth pipeline, and the second end of the second branch is connected to the inlet of the compressor through the fifth pipeline.

[0017] In some embodiments, the air conditioning system further includes a first expansion valve, which is disposed in the fourth pipeline.

[0018] In some embodiments, the air conditioning system further includes a first valve, which is disposed on the fifth pipeline and configured to control the opening and closing of the pipeline between the fifth pipeline and the inlet of the compressor.

[0019] In some embodiments, the first end of the enthalpy increase line is connected to the fifth line, and the first valve is close to the inlet of the compressor relative to the connection between the first end of the enthalpy increase line and the fifth line.

[0020] In some embodiments, the air conditioning system further includes a first control valve, which includes a first state and a second state. When the first control valve is in the first state, the first flow path is connected. When the first control valve is in the second state, the first flow path is disconnected.

[0021] In some embodiments, the first control valve includes a first interface, a second interface, a third interface and a fourth interface, the first interface is connected to the outlet of the compressor, the second interface is connected to the outdoor heat exchanger, the third interface and the fourth interface are both connected to the inlet of the compressor, the first control valve is in the first state, the first interface is connected to the second interface, the third interface is connected to the fourth interface, the first control valve is in the second state, the first interface is connected to the third interface, and the second interface is connected to the fourth interface.

[0022] In some embodiments, the air conditioning system further includes a second control valve, which includes a third state and a fourth state. When the second control valve is in the third state, the second flow path is connected. When the second control valve is in the fourth state, the second flow path is disconnected.

[0023] In some embodiments, the second control valve includes a fifth interface, a sixth interface, a seventh interface and an eighth interface, the fifth interface is connected to the outlet of the compressor, the sixth interface is connected to at least one indoor heat exchanger, the seventh interface and the eighth interface are both inlets of the compressor, the second control valve is in the third state, the fifth interface is connected to the sixth interface, the seventh interface is connected to the eighth interface, the second control valve is in the fourth state, the fifth interface is connected to the seventh interface, and the sixth interface is connected to the eighth interface.

[0024] In some embodiments, the outdoor heat exchanger comprises a water-cooled plate heat exchanger.

[0025] In some embodiments, the air-conditioning system further includes a conversion unit, wherein the first flow path fluid is connected to the outlet of the compressor and the outdoor heat exchanger, and then is connected to at least one indoor heat exchanger through the conversion unit fluid; and the second flow path fluid is connected to the outlet of the compressor, and then is connected to at least one indoor heat exchanger through the conversion unit fluid.

[0026] In one aspect of the present disclosure, a control method for the air-conditioning system in the above embodiment is provided, comprising:

[0027] After the air conditioning system starts running for the first preset time,

[0028] In cooling mode, if the saturation temperature corresponding to the pressure at the compressor inlet is greater than or equal to the first preset temperature value T1;

[0029] In heating mode, if the saturation temperature corresponding to the pressure at the outlet of the compressor is less than or equal to the second preset temperature value T2, T2>T1;

[0030] and the difference between the actual exhaust temperature at the outlet of the compressor and the saturation temperature corresponding to the pressure at the outlet of the compressor is greater than or equal to the third preset temperature T3;

[0031] Then open the regulating valve, connect the enthalpy increase pipeline, and enter the enthalpy increase mode.

[0032] In some embodiments, after the air conditioning system enters the enthalpy increase mode, the following actions are performed:

[0033] The compressor runs at the frequency required for the set target temperature.

[0034] In cooling mode, if the saturation temperature corresponding to the pressure at the compressor inlet is lower than the saturation temperature corresponding to the pressure at the compressor inlet required for the set target temperature, the compressor frequency is reduced; otherwise, the compressor frequency is increased;

[0035] In heating mode, if the saturation temperature corresponding to the pressure at the compressor outlet is lower than the saturation temperature corresponding to the pressure at the compressor outlet required for the set target temperature, the frequency of the compressor is increased; otherwise, the frequency of the compressor is reduced.

[0036] In some embodiments, the air-conditioning system further comprises a subcooler, a liquid storage member, a second pipeline, a third pipeline, a fourth pipeline and a fifth pipeline, a first expansion valve and a first valve; the liquid storage member is arranged on the pipeline between the outdoor heat exchanger and the subcooler; the subcooler comprises a first branch and a second branch, the first end of the first branch is connected to the liquid storage member through the second pipeline, and the second end of the first branch is connected to at least one indoor heat exchanger through the third pipeline; the first end of the second branch is connected to the liquid storage member through the fourth pipeline, and the second end of the second branch is connected to the inlet of the compressor through the fifth pipeline; the first expansion valve is arranged on the fourth pipeline; the first valve is arranged on the fifth pipeline, and the first valve is configured to control the pipeline opening and closing between the fifth pipeline and the inlet of the compressor; the first end of the enthalpy increase pipeline is connected to the fifth pipeline, and the first valve is close to the inlet of the compressor relative to the connection between the first end of the enthalpy increase pipeline and the fifth pipeline;

[0037] After the air conditioning system enters the enthalpy increase mode, it also performs the following actions:

[0038] If the actual temperature difference between the outlet and inlet of the subcooler is greater than or equal to the target temperature difference between the outlet and inlet of the subcooler required for the set target temperature, the opening of the first expansion valve is increased; otherwise, the opening of the first expansion valve is decreased;

[0039] Close the first valve;

[0040] Open the regulating valve to its maximum degree.

[0041] In some embodiments, the air conditioning system exits the enthalpy increase mode when at least one of the following conditions is met:

[0042] Shut down the computer;

[0043] Shutdown;

[0044] After entering the enthalpy increase mode and operating for the second preset time, in the cooling mode, the saturation temperature corresponding to the pressure at the compressor inlet is ≤ the fourth preset temperature T4; in the heating mode, the saturation temperature corresponding to the pressure at the compressor outlet is ≥ the fifth preset temperature T5; wherein T5>T4;

[0045] After entering the enthalpy increase mode and running for the second preset time, the difference between the actual exhaust temperature at the outlet of the compressor and the saturation temperature corresponding to the pressure at the outlet of the compressor is less than the sixth preset temperature T6.

[0046] In some embodiments, when the air conditioning system exits the enthalpy increase mode, the following actions are performed:

[0047] The compressor maintains the current frequency operation;

[0048] If the actual temperature difference between the outlet and inlet of the subcooler is greater than the target temperature difference between the outlet and inlet of the subcooler required for the set target temperature, the opening of the first expansion valve is increased; otherwise, the opening of the first expansion valve is decreased;

[0049] Open the first valve;

[0050] Close the regulating valve.

[0051] In some embodiments, the air conditioning system further comprises a liquid storage member, a pressurizing valve, and a first pipeline, wherein the liquid storage member is provided on the pipeline between the outdoor heat exchanger and at least one indoor heat exchanger, a first end of the first pipeline is connected to the outlet of the compressor, and a second end is connected to the liquid storage member, and the pressurizing valve is provided on the first pipeline;

[0052] After the air-conditioning system starts to run for the first preset time, if the ratio of the target value of the required cooling capacity or heating capacity to the rated value of the cooling capacity or heating capacity of the air-conditioning system is ≤ the first preset value A, and after continuing to run for the third preset time, the saturation temperature corresponding to the pressure at the outlet of the compressor is ≤ the seventh preset temperature value T7, and the actual exhaust temperature at the outlet of the compressor is ≥ the eighth preset temperature value T8, then the pressurizing valve is opened, where T8>T7.

[0053] In some embodiments, the pressurizing valve is closed when at least one of the following conditions is met:

[0054] Shut down the computer;

[0055] Shutdown;

[0056] The pressurizing valve is opened and continues to operate for a second preset time, and the saturation temperature corresponding to the pressure at the outlet of the compressor is greater than or equal to the ninth preset temperature T9;

[0057] The pressurizing valve is opened and continues to operate for a second preset time, and the difference between the actual exhaust temperature at the compressor outlet and the saturation temperature corresponding to the pressure at the compressor outlet is less than the tenth preset temperature T10; wherein T9>T10.

[0058] Based on the above technical solution, the present disclosure has at least the following beneficial effects:

[0059] In some embodiments, the air-conditioning system includes a full cooling mode, a full heating mode, a main cooling mode, a main heating mode, etc. In these modes, the regulating valve can be selectively opened to connect the enthalpy increase pipeline to achieve enthalpy increase of the compressor, thereby improving the energy efficiency and performance of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0061] Figure 1 A schematic diagram of an air conditioning system according to some embodiments of the present disclosure;

[0062] Figure 2 A schematic diagram of a complete cooling enthalpy increase mode of an air-conditioning system according to some embodiments of the present disclosure;

[0063] Figure 3 A schematic diagram of a complete heating enthalpy increase mode of an air-conditioning system according to some embodiments of the present disclosure;

[0064] Figure 4 This is a schematic diagram of a heat recovery enthalpy increase mode of an air-conditioning system according to some embodiments of the present disclosure.

[0065] The reference numerals in the accompanying drawings are described as follows:

[0066] 1- compressor; 2- outdoor heat exchanger; 3- indoor heat exchanger; 4- first control valve; 5- subcooler; 6- liquid storage element; 7- pressurizing valve; 8- oil-gas separator; 9- gas-liquid separator; 10- second control valve; 101- enthalpy increase pipeline; 102- conversion unit;

[0067] 11-first pipeline; 12-second pipeline; 13-third pipeline; 14-fourth pipeline; 15-fifth pipeline; 16-sixth pipeline; 17-seventh pipeline; 18-eighth pipeline;

[0068] 21-first expansion valve; 22-regulating valve; 23-third expansion valve;

[0069] 31 - first valve; 32 - second valve; 33 - third valve; 34 - fourth valve; 35 - fifth valve; 36 - sixth valve;

[0070] 41 - first throttle valve; 42 - second throttle valve; 43 - third throttle valve; 44 - fourth throttle valve; 45 - fifth throttle valve;

[0071] 51-first branch road; 52-second branch road;

[0072] 61 - first one-way valve; 62 - second one-way valve; 63 - third one-way valve.

[0073] It should be understood that the size of each part shown in the drawings is not drawn according to the actual proportional relationship.In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0074] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions, and numerical values set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0075] The terms "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The terms "include" or "comprises" and similar terms mean that the elements before the term include the elements listed after the term, and do not exclude the possibility of also including other elements. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0076] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0077] All terms (including technical or scientific terms) used in this disclosure have the same meaning as those understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0078] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0079] Figure 1 Schematic diagram of the structure of some embodiments of the air conditioning system according to the present disclosure. Figure 1 In some embodiments, the air conditioning system includes a compressor 1 , at least two indoor heat exchangers 3 , an outdoor heat exchanger 2 , a first flow path and a second flow path connected in parallel, an enthalpy increasing pipeline 101 and a regulating valve 22 .

[0080] The first flow path fluidly connects the outlet of the compressor 1, the outdoor heat exchanger 2, and at least one indoor heat exchanger 3. The second flow path fluidly connects the outlet of the compressor 1 and at least one indoor heat exchanger 3. The first flow path and the second flow path are configured to operate selectively or simultaneously.

[0081] A first end of the enthalpy increasing pipeline 101 is connected to the pipeline between the outdoor heat exchanger 2 and at least one indoor heat exchanger 3 , and a second end of the enthalpy increasing pipeline 101 is connected to the enthalpy increasing port of the compressor 1 .

[0082] The regulating valve 22 is provided in the enthalpy increasing pipeline 101 , and the regulating valve 22 is configured to adjust the on-off and flow rate of the enthalpy increasing pipeline 101 .

[0083] In some embodiments, the compressor 1 comprises a jet enthalpy increase compressor.

[0084] The enthalpy increase port of the compressor 1 is arranged in the medium-pressure chamber of the compressor 1 .

[0085] In some embodiments, the regulating valve 22 includes an electronic expansion valve. Using a highly accurate electronic expansion valve can achieve smooth regulation of stepless heat injection and accurately control the amount of heat injection according to the unit state, thereby improving comfort and reliability and making energy efficiency transitions smoother.

[0086] In the embodiment of the present disclosure, the air-conditioning system includes an outdoor heat exchanger 2 and at least two indoor heat exchangers 3, and the at least two indoor heat exchangers 3 are connected in parallel. The air-conditioning system is a multi-split system.

[0087] In the embodiment of the present disclosure, the first flow path and the second flow path are fluid communication paths. In some working modes, along the flow direction of the refrigerant, the outlet of the compressor 1, the outdoor heat exchanger 2 and the at least one indoor heat exchanger 3 are sequentially fluidly connected as the first flow path. In other working modes, along the flow direction of the refrigerant, at least one indoor heat exchanger 3, the outdoor heat exchanger 2 and the inlet of the compressor 1 are sequentially fluidly connected. Therefore, in fact, some pipes of the air-conditioning system, the outdoor heat exchanger 2, the at least one indoor heat exchanger 3, etc. may be located in the first flow path, or may be located in other flow paths. Similarly, at least one indoor heat exchanger 3 may be located in the first flow path, or the second flow path, or may also be located in other flow paths. Therefore, the first flow path and the second flow path are not necessarily fixed pipes. Therefore, there are no numbers in the first flow path and the second flow path diagram.

[0088] In the disclosed embodiment, the first fluid path connects the outlet of the compressor 1, the outdoor heat exchanger 2, and at least one indoor heat exchanger 3. The at least one indoor heat exchanger 3 is an indoor evaporator, capable of cooling the room. The second fluid path connects the outlet of the compressor 1 and at least one indoor heat exchanger 3. The at least one indoor heat exchanger 3 is an indoor condenser, capable of heating the room. Furthermore, the first fluid path can operate independently, with all indoor heat exchangers 3 serving as indoor evaporators in a fully cooling mode. The second fluid path can operate independently, with all indoor heat exchangers 3 serving as indoor condensers in a fully heating mode. The first flow path and the second flow path can work at the same time, and when the number of indoor evaporators is greater than the indoor condensers, it is the main cooling mode. When the number of indoor condensers is greater than the indoor evaporators, it is the main heating mode. Therefore, the air-conditioning system provided by the embodiment of the present disclosure includes a full cooling mode, a full heating mode, a main cooling mode, a main heating mode, etc. In these modes, the regulating valve 22 can be selectively opened to connect the enthalpy increase pipeline 101 to achieve enthalpy increase of the compressor, thereby improving the energy efficiency and performance of the compressor.

[0089] In some embodiments, the at least two indoor heat exchangers 3 include two, three, four or more indoor heat exchangers.

[0090] In some embodiments, the air-conditioning system further includes a third flow path and a fourth flow path in parallel, the third flow path fluid connecting at least one indoor heat exchanger 3 and the inlet of the compressor 1, the fourth flow path fluid connecting at least one indoor heat exchanger 3, the outdoor heat exchanger 2 and the inlet of the compressor 1, and the third flow path and the fourth flow path are configured to work selectively or simultaneously.

[0091] The third flow path can be connected to the first flow path to form a circulation loop, and the fourth flow path can be connected to the second flow path to form a circulation loop. The third flow path and the fourth flow path also represent fluid communication paths, not necessarily fixed pipelines, so they are not shown in the figure.

[0092] refer to Figures 2 to 4 In some embodiments, the air-conditioning system further includes a conversion unit 102. When at least one of the at least two indoor heat exchangers 3 is an indoor condenser and at least one of the indoor heat exchangers 3 is an indoor evaporator, the refrigerant of the indoor evaporator can flow to the indoor condenser through the conversion unit 102, or the refrigerant of the indoor condenser can flow to the indoor evaporator through the conversion unit 102.

[0093] In the main cooling mode, the refrigerant of the indoor evaporator flows to the indoor condenser through the conversion unit 102, which can recover the heat in the room that needs cooling and send it to the room that needs heating. The outdoor heat exchanger 2 is not used, reducing energy consumption.

[0094] In the main heating mode, the refrigerant of the indoor condenser flows to the indoor evaporator through the conversion unit 102, which can recover the coldness in the room that needs heating and send it to the room that needs cooling. The outdoor heat exchanger 2 is not used, reducing energy consumption.

[0095] In some embodiments, the air conditioning system further includes a liquid storage component 6 , which is disposed on a connecting pipeline between the outdoor heat exchanger 2 and at least one indoor heat exchanger 3 .

[0096] In some embodiments, the air conditioning system further includes a first pipeline 11 , a first end of the first pipeline 11 is connected to the outlet of the compressor 1 , and a second end of the first pipeline 11 is connected to the liquid storage member 6 .

[0097] In some embodiments, the air conditioning system further includes a pressurizing valve 7 , which is disposed on the first pipeline 11 .

[0098] During low-temperature cooling or minimum cooling, or low-load heating, the frequency of compressor 1 is low due to the low demand for cooling capacity. Therefore, insufficient power will be caused to drive the refrigerant circulation, which will result in low low-temperature cooling or minimum cooling, or low-load heating capacity.

[0099] Based on this, the first end of the first pipe 11 in the embodiment of the present disclosure is connected to the outlet of the compressor 1, and the second end of the first pipe 11 is connected to the liquid storage part 6. During low-temperature startup, for example: low-temperature refrigeration, minimum refrigeration or low-load heating, the pressurizing valve 7 is opened, the first pipe 11 is connected, and the first pipe 11 directly draws out the high-pressure gaseous refrigerant from the outlet of the compressor 1, and directly pressurizes and injects it into the liquid storage part 6, which is equivalent to shielding the pressure loss of the outdoor heat exchanger 2, providing greater flow power for the liquid refrigerant in the liquid storage part 6, increasing the refrigerant flow to the indoor heat exchanger 3, and improving the refrigerant pushing capacity, thereby increasing the low-temperature startup speed, improving the ability of low-temperature refrigeration or minimum refrigeration, or low-load heating, and thus improving the operating capacity of the system.

[0100] In some embodiments, the air conditioning system further includes a subcooler 5 , which is disposed on a connecting pipeline between the outdoor heat exchanger 2 and at least one indoor heat exchanger 3 , and a first end of the enthalpy increase pipeline 101 is connected to the subcooler 5 .

[0101] In some embodiments, the air-conditioning system further includes a liquid storage component 6, a pressurizing valve 7 and a first pipeline 11. The liquid storage component 6 is arranged on the pipeline between the outdoor heat exchanger 2 and the subcooler 5. The first end of the first pipeline 11 is connected to the outlet of the compressor 1, the second end of the first pipeline 11 is connected to the liquid storage component 6, and the pressurizing valve 7 is arranged on the first pipeline 11.

[0102] In some embodiments, the air conditioning system includes a first throttle member 41 , which is disposed on the first pipeline 11 .

[0103] Optionally, the first throttle member 41 includes a capillary tube.

[0104] In some embodiments, the air conditioning system further includes a third expansion valve 23 , which is disposed on a connecting pipe between the liquid storage element 6 and the outdoor heat exchanger 2 .

[0105] Optionally, the third expansion valve 23 includes an electronic expansion valve.

[0106] In some embodiments, the air conditioning system also includes a first one-way valve 61, which is connected in parallel with the third expansion valve 23, the inlet of the first one-way valve 61 is connected to the outdoor heat exchanger 2, and the outlet of the first one-way valve 61 is connected to the liquid storage part 6.

[0107] In some embodiments, the air conditioning system further includes a second pipeline 12 , a third pipeline 13 , a fourth pipeline 14 and a fifth pipeline 15 .

[0108] The subcooler 5 includes a first branch 51 and a second branch 52 .

[0109] A first end of the first branch 51 is connected to the liquid storage member 6 through the second pipeline 12 , and a second end of the first branch 51 is connected to at least one indoor heat exchanger 3 through the third pipeline 13 .

[0110] A first end of the second branch 52 is connected to the liquid storage member 6 through the fourth pipeline 14 , and a second end of the second branch 52 is connected to the inlet of the compressor 1 through the fifth pipeline 15 .

[0111] In some embodiments, the air conditioning system further includes a first expansion valve 21 , which is disposed in the fourth pipeline 14 .

[0112] Optionally, the first expansion valve 21 includes an electronic expansion valve.

[0113] In some embodiments, the air conditioning system further includes an enthalpy increase pipeline 101 , a first end of the enthalpy increase pipeline 101 is connected to the fifth pipeline 15 , and a second end of the enthalpy increase pipeline 101 is connected to the enthalpy increase port of the compressor 1 .

[0114] The enthalpy increasing pipeline 101 is used to guide the refrigerant passing through the subcooler 5 to the enthalpy increasing port of the compressor 1 to achieve the jet enthalpy increasing effect of the compressor 1.

[0115] In some embodiments, the air conditioning system further includes a first valve 31 , which is disposed on the fifth pipeline 15 . The first valve 31 is configured to control the connection and disconnection of the pipeline between the fifth pipeline 15 and the inlet of the compressor 1 .

[0116] In some embodiments, the first valve 31 is close to the inlet of the compressor 1 relative to the connection between the first end of the enthalpy increasing line 101 and the fifth line 15 .

[0117] In some embodiments, the air conditioning system further includes a first control valve 4, which includes a first state and a second state. When the first control valve 4 is in the first state, the first flow path is connected. When the first control valve 4 is in the second state, the first flow path is disconnected.

[0118] In some embodiments, the first control valve 4 includes a first interface, a second interface, a third interface and a fourth interface, the first interface is connected to the outlet of the compressor 1, the second interface is connected to the outdoor heat exchanger 2, and the third interface and the fourth interface are both connected to the inlet of the compressor 1.

[0119] The first control valve 4 is in the first state, the first port is communicated with the second port, and the third port is communicated with the fourth port.

[0120] The first control valve 4 is in the second state, the first port is communicated with the third port, and the second port is communicated with the fourth port.

[0121] In some embodiments, the air conditioning system includes a sixth pipeline 16 , and the third interface of the first control valve 4 is connected to the inlet of the compressor 1 through the sixth pipeline 16 .

[0122] In some embodiments, the air conditioning system includes a fifth throttle member 45 , which is disposed on the sixth pipeline 16 .

[0123] Optionally, the fifth throttle member 45 includes a capillary tube.

[0124] In some embodiments, the first control valve 4 comprises a four-way valve.

[0125] In some embodiments, the air conditioning system further includes a second control valve 10, which includes a third state and a fourth state. When the second control valve 10 is in the third state, the second flow path is connected; when the second control valve 10 is in the fourth state, the second flow path is disconnected.

[0126] In some embodiments, the second control valve 10 includes a fifth interface, a sixth interface, a seventh interface and an eighth interface, the fifth interface is connected to the outlet of the compressor 1, the sixth interface is connected to at least one indoor heat exchanger 3, the seventh interface and the eighth interface are both the inlet of the compressor 1, the second control valve 10 is in the third state, the fifth interface is connected to the sixth interface, and the seventh interface is connected to the eighth interface, the second control valve 10 is in the fourth state, the fifth interface is connected to the seventh interface, and the sixth interface is connected to the eighth interface.

[0127] In some embodiments, the second control valve 10 includes a four-way valve.

[0128] In some embodiments, the air conditioning system further includes a fourth throttle member 44 , which is disposed on a pipeline connecting the seventh interface and the inlet of the compressor 1 .

[0129] Optionally, the fourth throttle member 44 includes a capillary tube.

[0130] In some embodiments, the outdoor heat exchanger 2 includes a water-cooled plate heat exchanger.

[0131] The water-cooled plate heat exchanger exchanges heat with the refrigerant through circulating water.

[0132] The disclosed embodiment adopts a water-cooled plate heat exchanger. Since the refrigerant directly exchanges heat with water, its heat exchange effect is much higher than that of an air source heat exchanger. Therefore, the outdoor unit is small in size, which is more conducive to the transportation and installation of the unit and occupies a smaller area. In addition, the water-cooled plate heat exchanger does not need to exchange heat with the air. Therefore, the water source can be installed in a small machine room without the need for dedicated air ducts and other equipment. By adopting a water-cooled plate heat exchanger, the unit has a smaller volume for storing refrigerant. By cooperating with the first pipeline 1 and the liquid storage part 6, the refrigerant can be more concentrated to drive the rapid flow of liquid refrigerant, thereby achieving a rapid response of the refrigerant fluidity, thereby improving the energy efficiency of the unit and improving the comfort of use.

[0133] In some embodiments, the air-conditioning system further includes a conversion unit 102. After the first flow path fluid is connected to the outlet of the compressor 1 and the outdoor heat exchanger 2, it is connected to at least one indoor heat exchanger 3 through the conversion unit 102 fluid; after the second flow path fluid is connected to the outlet of the compressor 1, it is connected to at least one indoor heat exchanger 3 through the conversion unit 102 fluid.

[0134] In some embodiments, the air conditioning system further includes an oil-gas separator 8 provided at the outlet of the compressor 1. The refrigerant discharged from the compressor 1 first passes through the oil-gas separator 8 before entering the indoor heat exchanger 3 or the outdoor heat exchanger 2. The oil-gas separator 8 is used to separate oil and gas.

[0135] In some embodiments, the air conditioning system further includes a second one-way valve 62, which is disposed on the connecting pipeline between the oil-gas separator 8 and the fifth port of the second control valve 10. The inlet of the second one-way valve 62 is connected to the oil-gas separator 8, and the outlet of the second one-way valve 62 is connected to the fifth port of the second control valve 10.

[0136] In some embodiments, the air conditioning system further includes a third one-way valve 63, which is disposed on the connecting pipeline between the oil-gas separator 8 and the first control valve 4. The inlet of the third one-way valve 63 is connected to the oil-gas separator 8, and the outlet of the third one-way valve 63 is connected to the first control valve 4.

[0137] In some embodiments, the air conditioning system further includes a seventh pipeline 17 and a second valve 32. A first end of the seventh pipeline 17 is connected to the oil-gas separator 8, and a second end of the seventh pipeline 17 is connected to the inlet of the compressor 1. The second valve 32 is provided on the seventh pipeline 17 and is used to control the opening and closing of the seventh pipeline 17.

[0138] In some embodiments, the air conditioning system further includes a second throttle valve 42 , which is disposed on the seventh pipeline 17 .

[0139] In some embodiments, the air-conditioning system further includes a gas-liquid separator 9 provided at the inlet of the compressor 1 . The refrigerant flowing through the outdoor heat exchanger 2 or the indoor heat exchanger 3 and returning to the inlet of the compressor 1 first passes through the gas-liquid separator 9 before entering the inlet of the compressor 1 .

[0140] In some embodiments, the fifth pipeline 15 is connected to the inlet of the compressor 1 through the gas-liquid separator 9. The first end of the fifth pipeline 15 is connected to the second branch 52, and the second end of the fifth pipeline 15 is connected to the gas-liquid separator 9, which is connected to the inlet of the compressor 1.

[0141] In some embodiments, the air conditioning system further includes an eighth pipeline 18 , a first end of the eighth pipeline 18 is connected to the indoor heat exchanger 3 , a second end of the eighth pipeline 18 is connected to the gas-liquid separator 9 , and the gas-liquid separator 9 is connected to the inlet of the compressor 2 .

[0142] In some embodiments, the air conditioning system further includes a third throttle valve 43 , which is disposed on the eighth pipeline 18 .

[0143] In some embodiments, the air conditioning system further includes a sixth valve 36, which is disposed on the connecting pipe between the sixth port of the second control valve 10 and the at least one indoor heat exchanger 3. The sixth valve 36 is used to control the connection and disconnection of the connecting pipe between the sixth port of the second control valve 10 and the at least one indoor heat exchanger 3.

[0144] The following combination Figures 1 to 4Some specific embodiments of the air-conditioning system, as well as the complete cooling enthalpy increase mode, the complete heating enthalpy increase mode and the heat recovery enthalpy increase mode of the air-conditioning system are described in detail.

[0145] like Figure 1 As shown, the outlet of the compressor 1 is connected to the oil-gas separator 8, which is respectively connected to the third one-way valve 63 and the seventh pipeline 17. The seventh pipeline 17 is connected to the inlet of the compressor 1, and the second valve 32 and the second throttle valve 42 are provided on the seventh pipeline 17.

[0146] The third one-way valve 63 is connected to the first port of the first control valve 4 via a pipeline. The second port of the first control valve 4 is connected to the outdoor heat exchanger 2. The third and fourth ports of the first control valve 4 are connected to a merging pipeline. The merging pipeline is divided into two routes: one route is connected to the indoor heat exchanger 3, and the other route is connected to the inlet of the compressor 1. The third port of the first control valve 4 is connected to the merging pipeline via the sixth pipeline 16, which is provided with a fifth throttle valve 45. The first port of the first control valve 4 can be connected to the second port, and the third port of the first control valve 4 can be connected to the fourth port. Alternatively, the first port of the first control valve 4 can be connected to the third port, and the second port of the first control valve 4 can be connected to the fourth port.

[0147] The third one-way valve 63 is also connected to the fifth port of the second control valve 10 via a pipeline. A second one-way valve 62 is provided on the pipeline connecting the fifth port of the second control valve 10 and the third one-way valve 63. The sixth port of the second control valve 10 is connected to the indoor heat exchanger 3. A sixth valve 36 is provided on the pipeline connecting the sixth port of the second control valve 10 and the indoor heat exchanger 3. The seventh and eighth ports of the second control valve 10 are connected and are both connected to the inlet of the compressor 1. A fourth throttle valve 44 is provided on the pipeline connecting the seventh port of the second control valve 10 and the inlet of the compressor 1.

[0148] The third one-way valve 63 is further connected to the liquid storage member 6 through a first pipeline 11 , and the first throttling member 41 and the pressurizing valve 7 are provided on the first pipeline 11 .

[0149] The outdoor heat exchanger 2 is also sequentially connected to the third expansion valve 23, the liquid storage element 6, and the subcooler 5. The first one-way valve 61 is connected in parallel with the third expansion valve 23.

[0150] Subcooler 5 includes a first branch 51 and a second branch 52. A first end of first branch 51 is connected to liquid reservoir 6 via second pipeline 12, and a second end of first branch 51 is connected to at least one indoor heat exchanger 3 via third pipeline 13. A first end of second branch 52 is connected to liquid reservoir 6 via fourth pipeline 14, and a second end of second branch 52 is connected to the inlet of compressor 1 via fifth pipeline 15. First expansion valve 21 is provided on fourth pipeline 14.

[0151] The first end of the enthalpy-increasing pipeline 101 is connected to the fifth pipeline 15, and the second end of the enthalpy-increasing pipeline 101 is connected to the enthalpy-increasing port of the compressor 1. The regulating valve 22 is provided on the enthalpy-increasing pipeline 101. The first valve 31 is provided on the fifth pipeline 15, and the first valve 31 is closer to the inlet of the compressor 1 relative to the connection between the enthalpy-increasing pipeline 101 and the fifth pipeline 15.

[0152] The fifth pipeline 15 is connected to the inlet of the compressor 1 through the gas-liquid separator 9. The first end of the fifth pipeline 15 is connected to the second branch 52, and the second end of the fifth pipeline 15 is connected to the gas-liquid separator 9. The gas-liquid separator 9 is connected to the inlet of the compressor 1.

[0153] A first end of the eighth pipe 18 is connected to the indoor heat exchanger 3 , a second end of the eighth pipe 18 is connected to the gas-liquid separator 9 , and the gas-liquid separator 9 is connected to the inlet of the compressor 2 . A third throttle valve 43 is provided on the eighth pipe 18 .

[0154] A third valve 33 for controlling the on-off of the third pipeline 13 is provided on the pipeline connecting the third pipeline 13 and at least one indoor heat exchanger 3 .

[0155] A fourth valve 34 for controlling the on-off of the pipeline is provided on the pipeline connecting at least one indoor heat exchanger 3 and the inlet of the compressor 2 .

[0156] The eighth pipeline 18 is further provided with a fifth valve 35 for controlling the on-off of the eighth pipeline 18 .

[0157] like Figure 2 As shown in the figure, the refrigerant flow direction and function of the air-conditioning system when it is in full cooling mode and enthalpy is increased at the same time.

[0158] Main circuit: high-temperature and high-pressure gas refrigerant discharged from the outlet of compressor 1 -> oil-gas separator 8 -> first interface and second interface of the first control valve 4 -> outdoor heat exchanger 2 (function: condensation and heat release) -> third expansion valve 23 (state: fully open) -> liquid storage part 6 -> second pipeline 12 -> first branch 51 of subcooler 5 -> third pipeline 13 -> third valve 33 -> conversion unit 102 (function: to realize mode diversion of refrigerant, that is, to divert the cooling or heating refrigerant to the corresponding indoor unit) -> indoor heat exchanger 3 (function: evaporator, evaporation and heat absorption, lowering the indoor temperature) -> conversion unit 102 -> gas-liquid separator 9 -> the inlet of compressor 1 (compressor 1 performs the next compression cycle).

[0159] Pressurization branch: When low-temperature cooling or light-load heating is used, the pressurization valve 7 opens, and the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 is directly pressed into the liquid storage part 6, providing greater flow power for the liquid refrigerant in the liquid storage part 6, thereby achieving an increase in the mass flow rate of the indoor unit and ultimately improving the capacity at low load.

[0160] The refrigerant flowing out of the liquid storage member 6 is divided into two paths, one path flows to the first branch 51 of the subcooler 5 , and the other path passes through the first expansion valve 21 into the second branch 52 of the subcooler 5 and then enters the fifth pipeline 15 .

[0161] The refrigerant in the second branch 52 of the subcooler 5 flows to the fifth pipeline 15. When the first valve 31 is closed, the refrigerant enters the enthalpy increasing pipeline 101 and enters the enthalpy injection port of the compressor 1 through the regulating valve 22 to increase the enthalpy and improve the efficiency of the compressor 1.

[0162] The refrigerant in the second branch 52 of the subcooler 5 flows to the fifth pipeline 15 , the first valve 31 is opened, and the refrigerant enters the gas-liquid separator 9 through the first valve 31 and then enters the inlet of the compressor 1 through the gas-liquid separator 9 .

[0163] In the refrigeration enthalpy increase mode, since the enthalpy difference entering and exiting the indoor unit remains unchanged, although the refrigerant density will be slightly reduced due to the existence of the enthalpy increase pipeline, the mass flow rate will increase slightly or remain unchanged due to the increase in the refrigerant flow rate flowing into the indoor unit, and the enthalpy increase system will also increase the supercooling degree. At the same time, under the same target capacity, compressor 1 can achieve frequency reduction, which greatly increases the system power reduction and thus improves the refrigeration energy efficiency.

[0164] like Figure 3 As shown in the figure, the refrigerant flow direction and function when the air-conditioning system is in full heating mode and enthalpy is increased at the same time.

[0165] Main route: high-temperature and high-pressure gas refrigerant at the outlet of compressor 1 -> oil-gas separator 8 -> second control valve 10 -> conversion unit 102 -> indoor heat exchanger 3 (function: condenser, condensation releases heat, increases indoor temperature) -> conversion unit 102 -> subcooler 5 -> liquid storage part 6 -> third expansion valve 23 (state: throttling and pressure reduction) -> outdoor heat exchanger 2 (function: evaporation and heat absorption) -> first control valve 4 -> gas-liquid separator 9 -> inlet of compressor 1 (compressor 1 performs the next compression cycle).

[0166] Pressurization branch: When low-temperature cooling or light-load heating is used, the pressurization valve 7 opens, and the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 is directly pressed into the liquid storage part 6, providing greater flow power for the liquid refrigerant in the liquid storage part 6, thereby achieving an increase in the mass flow rate of the indoor unit and ultimately improving the capacity at low load.

[0167] The refrigerant flowing out of the liquid storage member 6 is divided into two paths, one path flows to the first branch 51 of the subcooler 5 , and the other path passes through the first expansion valve 21 into the second branch 52 of the subcooler 5 and then enters the fifth pipeline 15 .

[0168] The refrigerant in the second branch 52 of the subcooler 5 flows to the fifth pipeline 15. When the first valve 31 is closed, the refrigerant enters the enthalpy increasing pipeline 101 and enters the enthalpy injection port of the compressor 1 through the regulating valve 22 to increase the enthalpy and improve the efficiency of the compressor 1.

[0169] The refrigerant in the second branch 52 of the subcooler 5 flows to the fifth pipeline 15 , the first valve 31 is opened, and the refrigerant enters the gas-liquid separator 9 through the first valve 31 and then enters the inlet of the compressor 1 through the gas-liquid separator 9 .

[0170] In the heating enthalpy increase mode, the subcooler 5 can increase the enthalpy difference between the evaporator inlet and outlet, increase the refrigerant flow at the compressor outlet, and improve the work done in the compression process, thereby significantly increasing the heating capacity of the system.

[0171] Refrigerant flow direction and function when heat recovery mode and enthalpy increase are simultaneously performed:

[0172] Main cooling:

[0173] Refrigeration indoor unit flow direction: compressor 1 -> first control valve 4 -> outdoor heat exchanger 2 -> third electronic expansion unit 23 -> liquid storage element 6 -> subcooler 5 -> conversion unit 102 -> indoor heat exchanger 3 for cooling -> conversion unit 102 -> fourth valve 34 -> gas-liquid separator 9 -> compressor 1 .

[0174] Flow direction of the heating indoor unit: compressor 1 -> second control valve 10 -> conversion unit 102 -> indoor heat exchanger 3 for heating -> conversion unit 102 (mixed with refrigerant from the liquid valve) -> indoor heat exchanger 3 for cooling -> conversion unit 102 -> fourth valve 34 -> gas-liquid separator 9 -> compressor 1.

[0175] Pressurization branch: When low-temperature cooling or light-load heating is used, the pressurization valve 7 opens, and the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 is directly pressed into the liquid storage part 6, providing greater flow power for the liquid refrigerant in the liquid storage part 6, thereby achieving an increase in the mass flow rate of the indoor unit and ultimately improving the capacity at low load.

[0176] The refrigerant flowing out of the liquid storage member 6 is divided into two paths, one path flows to the first branch 51 of the subcooler 5 , and the other path passes through the first expansion valve 21 into the second branch 52 of the subcooler 5 and then enters the fifth pipeline 15 .

[0177] The refrigerant in the second branch 52 of the subcooler 5 flows to the fifth pipeline 15. When the first valve 31 is closed, the refrigerant enters the enthalpy increasing pipeline 101 and enters the enthalpy injection port of the compressor 1 through the regulating valve 22 to increase the enthalpy and improve the efficiency of the compressor 1.

[0178] The refrigerant in the second branch 52 of the subcooler 5 flows to the fifth pipeline 15 , the first valve 31 is opened, and the refrigerant enters the gas-liquid separator 9 through the first valve 31 and then enters the inlet of the compressor 1 through the gas-liquid separator 9 .

[0179] like Figure 4 As shown, the main heating:

[0180] Flow direction of the heating indoor unit: compressor 1 -> second control valve 10 -> conversion unit 102 -> indoor heat exchanger 3 for heating -> conversion unit 102 -> subcooler 5 -> liquid storage element 6 -> third electronic expansion device 23 -> outdoor heat exchanger 2 -> first control valve 4 -> gas-liquid separator 9 -> compressor 1.

[0181] Refrigeration unit flow direction: refrigerant from the indoor heat exchanger 3 for heating -> conversion unit 102 -> indoor heat exchanger 3 for cooling -> conversion unit 102 -> fourth valve 34 -> gas-liquid separator 9 -> compressor 1 .

[0182] Pressurization branch: When low-temperature cooling or light-load heating is used, the pressurization valve 7 opens, and the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 1 is directly pressed into the liquid storage part 6, providing greater flow power for the liquid refrigerant in the liquid storage part 6, thereby achieving an increase in the mass flow rate of the indoor unit and ultimately improving the capacity at low load.

[0183] The refrigerant flowing out of the liquid storage member 6 is divided into two paths, one path flows to the first branch 51 of the subcooler 5 , and the other path passes through the first expansion valve 21 into the second branch 52 of the subcooler 5 and then enters the fifth pipeline 15 .

[0184] The refrigerant in the second branch 52 of the subcooler 5 flows to the fifth pipeline 15. When the first valve 31 is closed, the refrigerant enters the enthalpy increasing pipeline 101 and enters the enthalpy injection port of the compressor 1 through the regulating valve 22 to increase the enthalpy and improve the efficiency of the compressor 1.

[0185] The refrigerant in the second branch 52 of the subcooler 5 flows to the fifth pipeline 15 , the first valve 31 is opened, and the refrigerant enters the gas-liquid separator 9 through the first valve 31 and then enters the inlet of the compressor 1 through the gas-liquid separator 9 .

[0186] Through the description of the above embodiments, the air conditioning system provided by the present disclosure can realize the full cooling mode and the full cooling mode, and also has:

[0187] Main cooling mode: Most indoor units can run in cooling mode, and a small number of indoor units can run in heating mode at the same time.

[0188] Main heating air conditioning system: Most indoor units can operate in heating mode, and a small number of indoor units can operate in cooling mode at the same time.

[0189] Full heat recovery mode: The number of indoor cooling units and indoor heating units is basically the same. At this time, the outdoor heat exchanger does not participate in the work. In this mode, some indoor heat exchangers serve as condensers and some indoor heat exchangers serve as evaporators, and the heat exchange capacity remains the same. The beneficial effect is that the heat exchange between different indoor rooms can be directly used to meet the needs of simultaneous cooling and heating.

[0190] In the three modes of full heat recovery mode, main cooling mode, and main heating mode, the system can utilize the energy exchange between different indoor rooms (such as a room is mainly used for cooling and another room is mainly used for heating. Therefore, the system can absorb heat from the cooling room, and through the vapor compression of the compressor, the low-level thermal energy is increased to high-level thermal energy, and then discharged to the indoor unit of the heating room to release heat). In this process, since the energy exchange mainly comes from indoor rooms of different modes, the energy exchange from the outside (outdoor or water source side) can be greatly reduced or eliminated, thereby reducing energy consumption (such as reducing the opening or operation of the cooling tower (when cooling) or the boiler (when heating) (including the water pump)). Therefore, the air-conditioning system provided by the embodiment of the present disclosure can further reduce the energy consumption of the entire system and improve energy saving.

[0191] Some embodiments further provide a method for controlling the air conditioning system, comprising:

[0192] After the air conditioning system starts running for the first preset time,

[0193] In cooling mode, if the saturation temperature corresponding to the pressure at the inlet of the compressor 1 is greater than or equal to the first preset temperature value T1;

[0194] In heating mode, if the saturation temperature corresponding to the pressure at the outlet of the compressor 1 is less than or equal to the second preset temperature value T2, T2>T1;

[0195] and the difference between the actual exhaust temperature at the outlet of the compressor 1 and the saturation temperature corresponding to the pressure at the outlet of the compressor 1 is greater than or equal to the third preset temperature T3;

[0196] Then, the regulating valve 22 is opened, the enthalpy increasing pipeline 101 is connected, and the enthalpy increasing mode is entered.

[0197] In some embodiments, the first preset temperature value T1 ranges from 3° C. to 13° C. Optionally, the first preset temperature value T1 is 8° C.

[0198] In some embodiments, the second preset temperature value T2 ranges from 35° C. to 45° C. Optionally, the second preset temperature value T2 is 40° C.

[0199] In some embodiments, the third preset temperature T3 is in the range of 15° C. to 25° C. Optionally, the third preset temperature T3 is 20° C.

[0200] In some embodiments, the first preset time ranges from 0 min to 10 min. Optionally, the first preset time is 5 min.

[0201] The pressure at the outlet of the compressor 1 is detected by a pressure detection element, and the saturation temperature corresponding to the pressure at the outlet of the compressor 1 is obtained by looking up a table.

[0202] The pressure at the inlet of the compressor 1 is detected by a pressure detection element, and the saturation temperature corresponding to the pressure at the inlet of the compressor 1 is obtained by looking up a table.

[0203] In some embodiments, after the air conditioning system enters the enthalpy increase mode, the following actions are performed:

[0204] Compressor 1 runs at the frequency required by the set target temperature.

[0205] In cooling mode, if the saturation temperature corresponding to the pressure at the inlet of compressor 1 is lower than the saturation temperature corresponding to the pressure at the inlet of compressor 1 required for the set target temperature, the frequency of compressor 1 is reduced; otherwise, the frequency of compressor 1 is increased;

[0206] In heating mode, if the saturation temperature corresponding to the outlet pressure of compressor 1 is lower than the saturation temperature corresponding to the outlet pressure of compressor 1 required for the set target temperature, the frequency of compressor 1 is increased; otherwise, the frequency of compressor 1 is reduced.

[0207] In some embodiments, the air conditioning system further includes a subcooler 5, a liquid storage member 6, a second pipeline 12, a third pipeline 13, a fourth pipeline 14 and a fifth pipeline 15, a first expansion valve 21 and a first valve 31; the liquid storage member 6 is provided on the pipeline between the outdoor heat exchanger 2 and the subcooler 5; the subcooler 5 includes a first branch 51 and a second branch 52, the first end of the first branch 51 is connected to the liquid storage member 6 through the second pipeline 12, and the second end of the first branch 51 is connected to at least one indoor heat exchanger 3 through the third pipeline 13; the second branch The first end of the branch line 52 is connected to the liquid storage member 6 via the fourth pipeline 14, and the second end of the second branch line 52 is connected to the inlet of the compressor 1 via the fifth pipeline 15; the first expansion valve 21 is provided on the fourth pipeline 14; the first valve 31 is provided on the fifth pipeline 15, and the first valve 31 is configured to control the connection and disconnection of the pipeline between the fifth pipeline 15 and the inlet of the compressor 1; the first end of the enthalpy increase pipeline 101 is connected to the fifth pipeline 15, and the first valve 31 is closer to the inlet of the compressor 1 relative to the connection between the first end of the enthalpy increase pipeline 101 and the fifth pipeline 15;

[0208] After the air conditioning system enters the enthalpy increase mode, it also performs the following actions:

[0209] If the actual temperature difference between the outlet and the inlet of the second branch 52 of the subcooler 5 is greater than or equal to the target temperature difference between the outlet and the inlet of the second branch 52 of the subcooler 5 required for the set target temperature, the opening of the first expansion valve 21 is increased; otherwise, the opening of the first expansion valve 21 is decreased;

[0210] Close the first valve 31;

[0211] The regulating valve 22 is opened to the maximum.

[0212] In some embodiments, the air conditioning system exits the enthalpy increase mode when at least one of the following conditions is met:

[0213] Shut down the computer;

[0214] Shutdown (including shutdown after reaching the target temperature);

[0215] After entering the enthalpy increase mode and running for the second preset time, in the cooling mode, the saturation temperature corresponding to the pressure at the inlet of the compressor 1 is ≤ the fourth preset temperature T4; in the heating mode, the saturation temperature corresponding to the pressure at the outlet of the compressor 1 is ≥ the fifth preset temperature T5; wherein T5>T4;

[0216] After entering the enthalpy increase mode and running for the second preset time, the difference between the actual exhaust temperature at the outlet of the compressor 1 and the saturation temperature corresponding to the pressure at the outlet of the compressor 1 is less than the sixth preset temperature T6.

[0217] In some embodiments, the second preset time ranges from 5 minutes to 15 minutes. Optionally, the second preset time is 10 minutes.

[0218] In some embodiments, the fourth preset temperature T4 is in the range of -10°C to 0°C. Optionally, the fourth preset temperature T4 is -5°C.

[0219] In some embodiments, the fifth preset temperature T5 ranges from 45° C. to 55° C. Optionally, the fifth preset temperature T5 is 50° C.

[0220] In some embodiments, the sixth preset temperature T6 ranges from 0° C. to 10° C. Optionally, the sixth preset temperature T6 is 5° C.

[0221] In some embodiments, when the air conditioning system exits the enthalpy increase mode, the following actions are performed:

[0222] Compressor 1 maintains the current frequency operation;

[0223] If the actual temperature difference between the outlet and the inlet of the second branch 52 of the subcooler 5 is greater than the target temperature difference between the outlet and the inlet of the second branch 52 of the subcooler 5 required for the set target temperature, the opening of the first expansion valve 21 is increased; otherwise, the opening of the first expansion valve 21 is decreased;

[0224] Open the first valve 31;

[0225] Close the regulating valve 22.

[0226] In some embodiments, the air-conditioning system further includes a liquid storage component 6, a pressurizing valve 7 and a first pipeline 11. The liquid storage component 6 is arranged on the pipeline between the outdoor heat exchanger 2 and at least one indoor heat exchanger 3. The first end of the first pipeline 11 is connected to the outlet of the compressor 1, the second end of the first pipeline 11 is connected to the liquid storage component 6, and the pressurizing valve 7 is arranged on the first pipeline 11.

[0227] After the air-conditioning system starts to run for the first preset time, if the ratio of the target value of the required cooling capacity or heating capacity to the rated value of the cooling capacity or heating capacity of the air-conditioning system is ≤ the first preset value A, and after continuing to run for the third preset time, the saturation temperature corresponding to the pressure at the outlet of the compressor 1 is ≤ the seventh preset temperature value T7, and the actual exhaust temperature at the outlet of the compressor 1 is ≥ the eighth preset temperature value T8, then the pressurizing valve 7 is opened, where T8>T7.

[0228] In some embodiments, the third preset time ranges from 0 min to 10 min. Optionally, the third preset time is 5 min.

[0229] In some embodiments, the first preset value A ranges from 15% to 25%. Optionally, the first preset value A is 20%.

[0230] In some embodiments, the seventh preset temperature value T7 ranges from 20° C. to 30° C. Optionally, the seventh preset temperature value T7 is 25° C.

[0231] In some embodiments, the eighth preset temperature value T8 is in the range of 45° C. to 55° C. Optionally, the eighth preset temperature value T8 is 50° C.

[0232] In some embodiments, the pressurizing valve 7 is closed when at least one of the following conditions is met:

[0233] Shut down the computer;

[0234] Shutdown (including shutdown after reaching the target temperature);

[0235] The pressurizing valve 7 is opened and continues to operate for a second preset time, and the saturation temperature corresponding to the pressure at the outlet of the compressor 1 is greater than or equal to the ninth preset temperature T9;

[0236] The pressurizing valve 7 is opened and continues to operate for a second preset time, and the difference between the actual exhaust temperature at the outlet of the compressor 1 and the saturation temperature corresponding to the pressure at the outlet of the compressor 1 is less than the tenth preset temperature T10; wherein T9>T10.

[0237] In some embodiments, the ninth preset temperature T9 is in the range of 30° C. to 40° C. Optionally, the ninth preset temperature T9 is 35° C.

[0238] In some embodiments, the tenth preset temperature T10 ranges from 0° C. to 10° C. Optionally, the tenth preset temperature T10 is 5° C.

[0239] The air-conditioning system provided by the embodiment of the present disclosure has the beneficial effects of improving energy efficiency, reducing costs, reducing weight, and high reliability.

[0240] Based on the above-mentioned embodiments of the present disclosure, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0241] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An air conditioning system, characterized in that: include: compressor (1); at least two indoor heat exchangers (3); outdoor heat exchanger (2); A first flow path and a second flow path are connected in parallel; wherein the first flow path fluid is connected to the outlet of the compressor (1), the outdoor heat exchanger (2) and at least one indoor heat exchanger (3); the second flow path fluid is connected to the outlet of the compressor (1) and at least one indoor heat exchanger (3); the first flow path and the second flow path are configured to work selectively or simultaneously; An enthalpy-increasing pipeline (101), a first end of which is connected to a pipeline between the outdoor heat exchanger (2) and at least one indoor heat exchanger (3), and a second end of which is connected to an enthalpy-increasing port of the compressor (1); as well as a regulating valve (22) provided on the enthalpy increasing pipeline (101), the regulating valve (22) being configured to regulate the on-off and flow rate of the enthalpy increasing pipeline (101); The invention also includes a third flow path and a fourth flow path connected in parallel, wherein the third flow path fluidly connects at least one indoor heat exchanger (3) and the inlet of the compressor (1), and the fourth flow path fluidly connects at least one indoor heat exchanger (3), the outdoor heat exchanger (2) and the inlet of the compressor (1), and the third flow path and the fourth flow path are configured to work selectively or simultaneously; It also includes a conversion unit (102), in which, when at least one indoor heat exchanger (3) is an indoor condenser and at least one indoor heat exchanger (3) is an indoor evaporator, the refrigerant of the indoor evaporator flows to the indoor condenser through the conversion unit (102), or the refrigerant of the indoor condenser flows to the indoor evaporator through the conversion unit (102).

2. The air conditioning system according to claim 1, wherein: The invention also includes a liquid storage component (6), a pressurizing valve (7) and a first pipeline (11), wherein the liquid storage component (6) is arranged on the pipeline between the outdoor heat exchanger (2) and at least one indoor heat exchanger (3), a first end of the first pipeline (11) is connected to the outlet of the compressor (1), a second end of the first pipeline (11) is connected to the liquid storage component (6), and the pressurizing valve (7) is arranged on the first pipeline (11).

3. The air conditioning system according to claim 1, wherein: It also includes a subcooler (5), which is arranged on the pipeline between the outdoor heat exchanger (2) and at least one indoor heat exchanger (3), and the first end of the enthalpy increase pipeline (101) is connected to the subcooler (5).

4. The air conditioning system according to claim 3, wherein: The invention also includes a liquid storage component (6), a pressurizing valve (7) and a first pipeline (11), wherein the liquid storage component (6) is arranged on the pipeline between the outdoor heat exchanger (2) and the subcooler (5), a first end of the first pipeline (11) is connected to the outlet of the compressor (1), a second end of the first pipeline (11) is connected to the liquid storage component (6), and the pressurizing valve (7) is arranged on the first pipeline (11).

5. The air conditioning system according to claim 4, wherein: The subcooler (5) further comprises a second pipeline (12), a third pipeline (13), a fourth pipeline (14) and a fifth pipeline (15); the subcooler (5) comprises a first branch (51) and a second branch (52); the first end of the first branch (51) is connected to the liquid storage member (6) through the second pipeline (12); the second end of the first branch (51) is connected to at least one indoor heat exchanger (3) through the third pipeline (13); the first end of the second branch (52) is connected to the liquid storage member (6) through the fourth pipeline (14); the second end of the second branch (52) is connected to the inlet of the compressor (1) through the fifth pipeline (15).

6. The air conditioning system according to claim 5, wherein: It also includes a first expansion valve (21), wherein the first expansion valve (21) is provided in the fourth pipeline (14).

7. The air conditioning system according to claim 5, wherein: The invention also includes a first valve (31), which is provided on the fifth pipeline (15). The first valve (31) is configured to control the opening and closing of the pipeline between the fifth pipeline (15) and the inlet of the compressor (1).

8. The air conditioning system according to claim 7, wherein: The first end of the enthalpy increasing pipeline (101) is connected to the fifth pipeline (15), and the first valve (31) is close to the inlet of the compressor (1) relative to the connection between the first end of the enthalpy increasing pipeline (101) and the fifth pipeline (15).

9. The air conditioning system according to claim 1, wherein: The invention also includes a first control valve (4), wherein the first control valve (4) includes a first state and a second state. When the first control valve (4) is in the first state, the first flow path is connected. When the first control valve (4) is in the second state, the first flow path is disconnected.

10. The air conditioning system according to claim 9, wherein: The first control valve (4) comprises a first interface, a second interface, a third interface and a fourth interface, wherein the first interface is connected to the outlet of the compressor (1), the second interface is connected to the outdoor heat exchanger (2), and the third interface and the fourth interface are both connected to the inlet of the compressor (1). When the first control valve (4) is in the first state, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface. When the first control valve (4) is in the second state, the first interface is communicated with the third interface, and the second interface is communicated with the fourth interface.

11. The air conditioning system according to claim 1, wherein: The invention also includes a second control valve (10), wherein the second control valve (10) includes a third state and a fourth state. When the second control valve (10) is in the third state, the second flow path is connected. When the second control valve (10) is in the fourth state, the second flow path is disconnected.

12. The air conditioning system according to claim 11, wherein: The second control valve (10) includes a fifth interface, a sixth interface, a seventh interface and an eighth interface, the fifth interface is connected to the outlet of the compressor (1), the sixth interface is connected to at least one indoor heat exchanger (3), the seventh interface and the eighth interface are both inlets of the compressor (1), the second control valve (10) is in the third state, the fifth interface is connected to the sixth interface, the seventh interface is connected to the eighth interface, and the second control valve (10) is in the fourth state, the fifth interface is connected to the seventh interface, and the sixth interface is connected to the eighth interface.

13. The air conditioning system according to claim 1, wherein: The outdoor heat exchanger (2) comprises a water-cooled plate heat exchanger.

14. The air conditioning system according to claim 1, wherein: The invention also includes a conversion unit (102), wherein the first flow path fluid is connected to the outlet of the compressor (1) and the outdoor heat exchanger (2), and then the fluid is connected to at least one indoor heat exchanger (3) through the conversion unit (102); and the second flow path fluid is connected to the outlet of the compressor (1), and then the fluid is connected to at least one indoor heat exchanger (3) through the conversion unit (102).

15. A method for controlling an air conditioning system according to any one of claims 1 to 14, comprising: After the air conditioning system starts running for the first preset time, In the cooling mode, if the saturation temperature corresponding to the pressure at the inlet of the compressor (1) is greater than or equal to the first preset temperature value T1; In the heating mode, if the saturation temperature corresponding to the pressure at the outlet of the compressor (1) is less than or equal to the second preset temperature value T2, T2>T1; and the difference between the actual exhaust temperature at the outlet of the compressor (1) and the saturation temperature corresponding to the pressure at the outlet of the compressor (1) is greater than or equal to a third preset temperature T3; Then, the regulating valve (22) is opened, the enthalpy increasing pipeline (101) is connected, and the enthalpy increasing mode is entered.

16. The control method of the air conditioning system according to claim 15, wherein after the air conditioning system enters the enthalpy increase mode, the following actions are performed: The compressor (1) operates at the frequency required for the set target temperature. In cooling mode, if the saturation temperature corresponding to the pressure at the inlet of the compressor (1) is lower than the saturation temperature corresponding to the pressure at the inlet of the compressor (1) required for the set target temperature, the frequency of the compressor (1) is reduced; otherwise, the frequency of the compressor (1) is increased; In the heating mode, if the saturation temperature corresponding to the pressure at the outlet of the compressor (1) is lower than the saturation temperature corresponding to the pressure at the outlet of the compressor (1) required for the set target temperature, the frequency of the compressor (1) is increased; otherwise, the frequency of the compressor (1) is reduced.

17. The control method of the air-conditioning system according to claim 16, wherein the air-conditioning system further comprises a subcooler (5), a liquid storage member (6), a second pipeline (12), a third pipeline (13), a fourth pipeline (14) and a fifth pipeline (15), a first expansion valve (21) and a first valve (31); the liquid storage member (6) is provided on the pipeline between the outdoor heat exchanger (2) and the subcooler (5); the subcooler (5) comprises a first branch (51) and a second branch (52), a first end of the first branch (51) being connected to the liquid storage member (6) through the second pipeline (12), and a second end of the first branch (51) being connected to at least one indoor heat exchanger (3) through the third pipeline (13); the second branch (52) The first end of the branch (52) is connected to the liquid storage member (6) through the fourth pipeline (14), and the second end of the second branch (52) is connected to the inlet of the compressor (1) through the fifth pipeline (15); the first expansion valve (21) is provided on the fourth pipeline (14); the first valve (31) is provided on the fifth pipeline (15), and the first valve (31) is configured to control the on-off of the pipeline between the fifth pipeline (15) and the inlet of the compressor (1); the first end of the enthalpy increase pipeline (101) is connected to the fifth pipeline (15), and the first valve (31) is close to the inlet of the compressor (1) relative to the connection between the first end of the enthalpy increase pipeline (101) and the fifth pipeline (15); After the air conditioning system enters the enthalpy increase mode, it also performs the following actions: If the actual temperature difference between the outlet and the inlet of the subcooler (5) is greater than or equal to the target temperature difference between the outlet and the inlet of the subcooler (5) required for the set target temperature, the opening of the first expansion valve (21) is increased; otherwise, the opening of the first expansion valve (21) is decreased; closing the first valve (31); The regulating valve (22) is set to the maximum opening.

18. The control method of the air conditioning system according to claim 17, wherein: The air conditioning system exits the enthalpy increase mode when at least one of the following conditions is met: Shut down the computer; Shutdown; After entering the enthalpy increase mode and running for a second preset time, in the cooling mode, the saturation temperature corresponding to the pressure at the inlet of the compressor (1) is ≤ a fourth preset temperature T4; in the heating mode, the saturation temperature corresponding to the pressure at the outlet of the compressor (1) is ≥ a fifth preset temperature T5; wherein T5>T4; After entering the enthalpy increase mode and running for the second preset time, the difference between the actual exhaust temperature at the outlet of the compressor (1) and the saturation temperature corresponding to the pressure at the outlet of the compressor (1) is less than the sixth preset temperature T6.

19. The control method of the air conditioning system according to claim 18, wherein: The air conditioning system performs the following actions when exiting the enthalpy increase mode: The compressor (1) maintains the current frequency operation; If the actual temperature difference between the outlet and the inlet of the subcooler (5) is greater than the target temperature difference between the outlet and the inlet of the subcooler (5) required for the set target temperature, the opening of the first expansion valve (21) is increased; otherwise, the opening of the first expansion valve (21) is decreased; Opening the first valve (31); Close the regulating valve (22).

20. The control method of an air-conditioning system according to claim 15, wherein the air-conditioning system further comprises a liquid storage element (6), a pressurizing valve (7) and a first pipeline (11), wherein the liquid storage element (6) is provided on the pipeline between the outdoor heat exchanger (2) and at least one indoor heat exchanger (3), a first end of the first pipeline (11) is connected to the outlet of the compressor (1), and a second end is connected to the liquid storage element (6), and the pressurizing valve (7) is provided on the first pipeline (11); After the air conditioning system starts to run for a first preset time, if the ratio of the target value of the required cooling capacity or heating capacity to the rated value of the cooling capacity or heating capacity of the air conditioning system is less than or equal to the first preset value A, and after the system continues to run for a third preset time, the saturation temperature corresponding to the pressure at the outlet of the compressor (1) is less than or equal to the seventh preset temperature value T7, and the actual exhaust temperature at the outlet of the compressor (1) is greater than or equal to the eighth preset temperature value T8, then the pressurizing valve (7) is opened, wherein, T8>T7.

21. The control method of the air conditioning system according to claim 20, When at least one of the following conditions is met, the pressure valve (7) is closed: Shut down the computer; Shutdown; The pressurizing valve (7) is opened and continues to operate for a second preset time, and the saturation temperature corresponding to the pressure at the outlet of the compressor (1) is greater than or equal to a ninth preset temperature T9; The pressurizing valve (7) is opened and continues to operate for a second preset time, and the difference between the actual exhaust temperature at the outlet of the compressor (1) and the saturation temperature corresponding to the pressure at the outlet of the compressor (1) is less than the tenth preset temperature T10; wherein, T9>T10.

Images