Air conditioning system

Abstract

The utility model relates to the technical field of air conditioners and discloses an air conditioning system. The air conditioning system comprises a refrigerant circulation loop which comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device and an outdoor heat exchanger, the indoor heat exchanger communicates with the outdoor heat exchanger through a refrigerant communicating pipeline, and the throttling device is arranged on the refrigerant communicating pipeline; the economizer comprises an evaporation part and a condensation part which are arranged in a heat exchange mode, the condensation part is arranged on the refrigerant communicating pipeline and communicates with the refrigerant communicating pipeline, and the evaporation part communicates between the refrigerant communicating pipeline and the compressor; the first bypass pipeline is communicated between the first end of the condensation part and the inlet of the evaporation part, and the second bypass pipeline is communicated between the second end of the condensation part and the inlet of the evaporation part; the first electronic expansion valve is arranged on the first bypass pipeline and located on the upstream of the evaporation part. The second electronic expansion valve is arranged on the second bypass pipeline and located on the upstream of the evaporation part. Therefore, air supply and enthalpy increase can be carried out regardless of heating or refrigerating, and the air supply pressure can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, for example to an air conditioning system. BACKGROUND

[0002] At present, heat pump air conditioners are widely used in the north. In order to meet the needs of the northern market, low-temperature machines have gradually become the research object of major manufacturers, and the air supplement and enthalpy increase system can effectively solve the low-temperature heating problem.

[0003] In the related art, when a general compressor is used for heating in winter, the air supplement and enthalpy increase are performed by increasing the discharge amount by increasing the compressor frequency, or by increasing the electric auxiliary heating.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] In the related art, increasing the compressor frequency can cause the exhaust temperature to be too high, resulting in failure, and using electric auxiliary heating can cause the machine to consume a large amount of power, resulting in user complaints. Moreover, the air supplement and enthalpy increase system in the related art cannot ensure the amount of refrigerant supplemented into the compressor.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those skilled in the art. CONTENT OF THE INVENTION

[0007] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not a general review, nor does it determine the key / important components or delineate the protection scope of these embodiments, but serves as a prelude to the detailed description below.

[0008] The air conditioning system provided by the embodiments of the present disclosure can improve the refrigerant pressure of the air supplement and enthalpy increase compressor, improve the air supplement amount, and effectively supplement air in both cooling and heating modes.

[0009] The embodiment of the present disclosure provides an air conditioning system, which comprises: a refrigerant circulation loop comprising a compressor, a four-way valve, an indoor heat exchanger, a throttling device and an outdoor heat exchanger, the indoor heat exchanger and the outdoor heat exchanger are communicated through a refrigerant communication pipeline, and the throttling device is arranged in the refrigerant communication pipeline; an economizer comprising an evaporating part and a condensing part arranged in heat exchange, the condensing part is arranged in the refrigerant communication pipeline and communicated with the refrigerant communication pipeline, and the evaporating part is communicated between the refrigerant communication pipeline and the compressor; a bypass pipeline comprising a first bypass pipeline and a second bypass pipeline, the first bypass pipeline is communicated between a first end of the condensing part and an inlet of the evaporating part, and the second bypass pipeline is communicated between a second end of the condensing part and the inlet of the evaporating part; and electronic expansion valves comprising a first electronic expansion valve and a second electronic expansion valve, the first electronic expansion valve is arranged in the first bypass pipeline and located upstream of the evaporating part, and the second electronic expansion valve is arranged in the second bypass pipeline and located upstream of the evaporating part.

[0010] Optionally, when the air conditioning system operates in a cooling mode, the refrigerant of the condensing part flows from the first end of the condensing part to the second end of the condensing part, and the first electronic expansion valve is configured to throttle, and the second electronic expansion valve is closed; and / or, when the air conditioning system operates in a heating mode, the refrigerant of the condensing part flows from the second end of the condensing part to the first end of the condensing part, and the second electronic expansion valve is configured to throttle, and the first electronic expansion valve is closed.

[0011] Optionally, the air conditioning system further comprises a controller electrically connected with the first electronic expansion valve and the second electronic expansion valve, and the controller is configured to control the opening degree of the first electronic expansion valve or the second electronic expansion valve.

[0012] Optionally, the air conditioning system further comprises a first temperature sensor arranged at the inlet of the evaporating part and used for detecting the temperature of the refrigerant flowing out of the first electronic expansion valve and / or the second electronic expansion valve, and a second temperature sensor arranged at the outlet of the evaporating part and used for detecting the temperature of the refrigerant flowing out of the evaporating part, wherein the controller is electrically connected with the first temperature sensor and the second temperature sensor, and the controller is configured to control the opening degree of the first electronic expansion valve or the second electronic expansion valve according to the temperature of the refrigerant detected by the first temperature sensor and / or the second temperature sensor.

[0013] Optionally, the air conditioning system further comprises a pressure sensor arranged at the suction side of the compressor and used for detecting the suction pressure, wherein the controller is electrically connected with the compressor and the pressure sensor, and the controller is configured to control the working frequency of the compressor according to the temperature of the refrigerant flowing out of the evaporating part and the suction pressure.

[0014] Optionally, the air conditioning system further comprises: a third temperature sensor arranged at the first end of the condensing unit and configured to detect the refrigerant temperature at the first end of the condensing unit; and a fourth temperature sensor arranged at the second end of the condensing unit and configured to detect the refrigerant temperature at the second end of the condensing unit; wherein the controller is electrically connected to the third temperature sensor and the fourth temperature sensor, and is configured to control the opening degree of the first electronic expansion valve or the second electronic expansion valve according to the refrigerant temperature at the first end of the condensing unit and / or the refrigerant temperature at the second end of the condensing unit.

[0015] Optionally, the number of throttling devices is plural, and the plural throttling devices comprise a first throttling device and a second throttling device arranged in sequence along the direction from the indoor heat exchanger to the outdoor heat exchanger; wherein the condensing unit is connected between the first throttling device and the second throttling device, and when the air conditioning system operates in the cooling mode, the first throttling device is configured to throttle, and the second throttling device is configured to be fully open, and the condensing unit and the first throttling device are arranged in sequence along the refrigerant flow direction in the refrigerant communication pipeline; when the air conditioning system operates in the heating mode, the second throttling device is configured to throttle, and the first throttling device is configured to be fully open, and the condensing unit and the second throttling device are arranged in sequence along the refrigerant flow direction in the refrigerant communication pipeline.

[0016] Optionally, the air conditioning system further comprises: a heat sink connected between the first throttling device and the second throttling device.

[0017] Optionally, the outlet end of the evaporating unit is connected to the medium-pressure cabin of the compressor.

[0018] Optionally, the first port of the four-way valve is connected to the exhaust port of the compressor, the second port of the four-way valve is connected to the suction port of the compressor, the third port of the four-way valve is connected to the indoor heat exchanger, and the fourth port of the four-way valve is connected to the indoor heat exchanger; the air conditioning system further comprises: a gas-liquid separator arranged between the second port of the four-way valve and the suction port of the compressor; wherein the indoor heat exchanger comprises a water-fluorine heat exchanger.

[0019] The air conditioning system provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] The air conditioning system of the embodiment of the present disclosure can switch the cooling or heating mode of the air conditioning system through the four-way valve, the refrigerant communication pipeline is communicated between the indoor heat exchanger and the outdoor heat exchanger, so that when the air conditioning system is in the cooling mode, the refrigerant of the outdoor heat exchanger flows to the indoor heat exchanger along the refrigerant communication pipeline after throttling by the throttling device. When the air conditioning system is in the heating mode, the refrigerant of the indoor heat exchanger flows to the outdoor heat exchanger along the refrigerant communication pipeline after throttling by the throttling device. The economizer comprises an evaporating portion and a condensing portion arranged in heat exchange, the evaporating portion is communicated with both ends of the refrigerant communication pipeline through two bypass pipelines, and each bypass pipeline is provided with an electronic expansion valve correspondingly, so that the electronic expansion valve can throttle the refrigerant flowing into the evaporating portion through the refrigerant communication pipeline, thereby reducing the refrigerant temperature of the evaporating portion, and the evaporating portion and the condensing portion are in heat exchange, the refrigerant in the evaporating portion absorbs heat to evaporate into gaseous refrigerant, and the gaseous refrigerant can be supplemented into the compressor, thereby supplementing the air of the compressor. In this way, it will not cause the fault caused by the too high exhaust temperature, and it will not cause the high power consumption of the machine. And by arranging the bypass pipeline and the electronic expansion valve in the compressor, not only the air can be supplemented, but also the refrigerant amount in the compressor can be supplemented. When the exhaust temperature of the compressor is too high, the gaseous refrigerant of the evaporating portion can be delivered into the compressor, and the temperature of the gaseous refrigerant of the evaporating portion is lower than the exhaust temperature of the compressor, so that the gaseous refrigerant entering the compressor can reduce the refrigerant temperature of the compressor, so that the refrigerant is compressed twice, the operation efficiency is improved, and a large amount of liquid refrigerant entering the compressor is prevented, causing liquid strike.

[0021] In addition, the first bypass pipeline is communicated with the first end of the condensing portion, and the second bypass pipeline is communicated with the second end of the condensing portion, so that the first electronic expansion valve and the second electronic expansion valve can be selectively opened according to the operation mode of the air conditioning system, so as to adjust the pressure of the refrigerant flowing into the evaporating portion, so as to ensure the pressure of the gaseous refrigerant flowing into the compressor, ensure the air supplementing pressure and the air supplementing amount. In this way, air supplementing and enthalpy increase can be performed during heating or cooling, the air supplementing pressure can be ensured, and the exhaust temperature of the compressor can be reduced, so that the refrigerant is compressed twice, the operation efficiency is improved.

[0022] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitation on the embodiments, elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute proportional limitation, and wherein:

[0024] Figure 1 is a structure schematic diagram of an air conditioning system provided by the embodiment of the present disclosure when cooling;

[0025] Figure 2is a structure schematic diagram of an air conditioning system provided by an embodiment of the present disclosure when heating;

[0026] Figure 3 is another structure schematic diagram of an air conditioner provided by an embodiment of the present disclosure when cooling;

[0027] Figure 4 is another structure schematic diagram of an air conditioning system provided by an embodiment of the present disclosure when heating;

[0028] Figure 5 is another structure schematic diagram of an air conditioning system provided by an embodiment of the present disclosure.

[0029] Reference signs:

[0030] 10, compressor; 101, four-way valve; 102, indoor heat exchanger; 103, outdoor heat exchanger; 104, gas-liquid separator; 105, refrigerant communication pipeline; 106, throttling device; 1061, first throttling device; 1062, second throttling device; 107, radiator; 108, pressure sensor; 109, high-pressure pressure sensor; 20, economizer; 201, bypass pipeline; 2011, first bypass pipeline; 2012, second bypass pipeline; 202, electronic expansion valve; 2021, first electronic expansion valve; 2022, second electronic expansion valve; 203, condensing part; 2031, third temperature sensor; 2032, fourth temperature sensor; 204, evaporating part; 2041, first temperature sensor; 2042, second temperature sensor. DETAILED DESCRIPTION

[0031] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.

[0032] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances in order to describe the embodiments of the present disclosure herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0033] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0034] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0035] Unless otherwise specified, the term "a plurality of" means two or more.

[0036] The term "and / or" is a description of the association relationship of the object, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, three relationships.

[0037] It should be noted that the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0038] For ease of description, the bold arrows in the drawings represent the flow path of the refrigerant flowing out of the evaporator, and the dashed lines represent the flow path of the refrigerant in the first bypass circuit or the second bypass circuit and the evaporator.

[0039] In combination Figures 1 to 5 As shown, the present disclosure provides an air conditioning system, which includes a refrigerant circulation loop, and the refrigerant circulation loop includes a compressor, a four-way valve, an indoor heat exchanger, a throttling device and an outdoor heat exchanger. As shown in Figure 2 and Figure 4 As shown, when the air conditioning system is heating, the indoor heat exchanger is a condenser, and the outdoor heat exchanger is an evaporator. As shown in Figure 1 and Figure 3 As shown, when the air conditioning system is cooling, the indoor heat exchanger is an evaporator, and the outdoor heat exchanger is a condenser. As shown in Figures 1 to 4As shown, when the air conditioning system is running, the high-temperature and high-pressure refrigerant flowing out of the compressor flows into the condenser through the four-way valve, is cooled in the condenser, and then flows into the throttling device for throttling. The throttled refrigerant becomes low-pressure refrigerant and flows into the evaporator. The refrigerant in the evaporator is evaporated into gaseous refrigerant, and then flows back to the compressor.

[0040] Optionally, the air conditioning system further comprises a refrigerant communication pipeline, the refrigerant communication pipeline being communicated between the indoor heat exchanger and the outdoor heat exchanger, and the throttling device being arranged in the refrigerant communication pipeline. Here, the throttling device is arranged in the refrigerant communication pipeline, so that the refrigerant flowing out of the condenser needs to pass through the throttling device for throttling before flowing to the evaporator for evaporation.

[0041] Optionally, the throttling device is a plurality of throttling devices, the plurality of throttling devices comprising a first throttling device and a second throttling device, the first throttling device and the second throttling device being arranged in the refrigerant communication pipeline in sequence along a direction from the indoor heat exchanger to the outdoor heat exchanger. When the air conditioning system is running in the cooling mode, the first throttling device throttles and the second throttling device is fully open, and the refrigerant flowing out of the outdoor heat exchanger passes through the first throttling device for throttling before flowing into the indoor heat exchanger. When the air conditioning system is running in the heating mode, the second throttling device throttles and the first throttling device is fully open, and the refrigerant flowing out of the indoor heat exchanger passes through the second throttling device for throttling before flowing into the outdoor heat exchanger.

[0042] Optionally, as shown, Figures 1 to 5 the economizer 20 is communicated between the first throttling device 1061 and the second throttling device 1062.

[0043] In the embodiments of the present disclosure, the economizer 20 is communicated between the first throttling device 1061 and the second throttling device 1062, so that the condensing portion 203 is also located between the first throttling device 1061 and the second throttling device 1062. Therefore, the refrigerant flowing out of the condenser first passes through the condensing portion 203 for further condensing to improve the condensing effect before flowing to the throttling device 106 for throttling, so as to ensure the normal operation of the air conditioning system.

[0044] Optionally, the condensing portion 203 is communicated between the first throttling device 1061 and the second throttling device 1062, as shown in Figure 1 and Figure 3 When the air conditioning system is running in the cooling mode, the first throttling device 1061 is configured to throttle, the second throttling device 1062 is configured to be fully open, and the condensing portion 203 and the first throttling device 1061 are arranged in sequence along the flow direction of the refrigerant in the refrigerant communication pipeline 105; as shown in Figure 2 and Figure 4As shown, when the air conditioning system operates in the heating mode, the second throttling device 1062 is configured to throttle, and the first throttling device 1061 is configured to be fully open. The condensing portion 203 and the second throttling device 1062 are sequentially arranged along the flow direction of the refrigerant in the refrigerant communication pipeline 105. In this way, no matter whether the air conditioning system operates in the cooling mode or the heating mode, the condensing portion 203 can further condense and dissipate the refrigerant flowing out of the condenser, and then the refrigerant flows to the throttling device 106 for throttling. This does not affect the normal operation of the air conditioning system, but also improves the condensing effect and the operating efficiency of the air conditioning system, and reduces energy consumption.

[0045] Optionally, the air conditioning system further comprises an economizer 20, a bypass pipeline 201 and an electronic expansion valve 202. The economizer 20 comprises a heat exchange arranged evaporating portion 204 and a condensing portion 203. The condensing portion 203 is arranged in the refrigerant communication pipeline 105 and communicates with the refrigerant communication pipeline 105. The evaporating portion 204 is communicated between the refrigerant communication pipeline 105 and the compressor 10. The bypass pipeline 201 comprises a first bypass pipeline 2011 and a second bypass pipeline 2012. The first bypass pipeline 2011 is communicated between the first end of the condensing portion 203 and the inlet of the evaporating portion 204. The second bypass pipeline 2012 is communicated between the second end of the condensing portion 203 and the inlet of the evaporating portion 204. The electronic expansion valve 202 comprises a first electronic expansion valve 2021 and a second electronic expansion valve 2022. The first electronic expansion valve 2021 is arranged in the first bypass pipeline 2011 and located upstream of the evaporating portion 204, and is used to control the on-off of the first bypass pipeline 2011. The second electronic expansion valve 2022 is arranged in the second bypass pipeline 2012 and located upstream of the evaporating portion 204, and is used to control the on-off of the second bypass pipeline 2012.

[0046] In the embodiment of the present disclosure, the high-temperature refrigerant flowing out of the condenser flows into the condensing portion 203 through the refrigerant communication pipeline 105, and can also flow into the evaporating portion 204 through the refrigerant communication pipeline 105, but before flowing into the evaporating portion 204, the high-temperature refrigerant passes through the throttling and cooling of the electronic expansion valve 202, so that the refrigerant after throttling and cooling can exchange heat with the condensing portion 203 in the evaporating portion 204, so that the refrigerant temperature of the condensing portion 203 is reduced, and the condensing effect of the refrigerant of the air conditioning system is improved. At the same time, the refrigerant in the evaporating portion 204 absorbs heat and evaporates into gaseous refrigerant, and the gaseous refrigerant flows into the compressor 10, so that the gaseous refrigerant can be supplemented into the compressor 10 to supplement the compressor 10 and provide refrigeration or heating effect. And the high-temperature refrigerant in the compressor 10 mixes with the gaseous refrigerant supplemented by the evaporating portion 204, so that the refrigerant temperature in the compressor 10 can be reduced, and the mixed refrigerant is compressed again and discharged from the compressor 10 again, so that the operation efficiency is improved, and a large amount of liquid refrigerant is prevented from entering the compressor 10 to cause liquid hammer. In the embodiment, the two bypass pipelines 201 are connected at both ends of the condensing portion 203, and each bypass pipeline 201 is provided with an electronic expansion valve 202, so that the electronic expansion valve 202 can be selectively opened for throttling according to the refrigeration or heating mode of the air conditioning system, or according to the inlet and outlet pressures of the condensing portion 203, so that the pressure of the refrigerant flowing into the evaporating portion 204 can be adjusted, and the gas supplementing pressure flowing into the compressor 10 is ensured, and the gas supplementing effect is improved. In this way, the air conditioning system can effectively supplement gas in both refrigeration and heating modes, and can ensure the gas supplementing pressure in the refrigeration or heating mode, reduce the exhaust temperature of the compressor 10, improve the exhaust volume, and improve the operation effect and effect.

[0047] Optionally, as shown in Figure 1 , when the air conditioning system operates in the refrigeration mode, the refrigerant of the condensing portion 203 flows from the first end of the condensing portion 203 to the second end of the condensing portion 203, and the first electronic expansion valve 2021 is configured to throttle, and the second electronic expansion valve 2022 is closed; and / or, as shown in Figure 2 , when the air conditioning system operates in the heating mode, the refrigerant of the condensing portion 203 flows from the second end of the condensing portion 203 to the first end of the condensing portion 203, and the second electronic expansion valve 2022 is configured to throttle, and the first electronic expansion valve 2021 is closed.

[0048] In the embodiment of the present disclosure, when the air conditioning system operates in the cooling mode, the first electronic expansion valve 2021 throttles, and the second electronic expansion valve 2022 is closed, so that the first bypass pipeline 2011 is connected, and the second bypass pipeline 2012 is disconnected. The refrigerant flowing out of the outdoor heat exchanger 103 (condenser) flows into the refrigerant communication pipeline 105. Part of the refrigerant flows into the condensing part 203 along the refrigerant communication pipeline 105, and then flows into the indoor heat exchanger 102 along the refrigerant communication pipeline 105 after throttling by the throttling device 106. Another part of the refrigerant flows into the first bypass pipeline 2011 through the refrigerant communication pipeline 105, and then flows into the evaporating part 204 after throttling by the first electronic expansion valve 2021 of the first bypass pipeline 2011. In this way, in the cooling mode, the refrigerant flowing into the evaporating part 204 is the refrigerant at the inlet of the condensing part 203. The pressure of the refrigerant at the inlet side of the condensing part 203 is higher than the pressure of the refrigerant at the outlet of the condensing part 203. In this way, the pressure of the refrigerant flowing into the evaporating part 204 can be increased, and the supercharging pressure of the gaseous refrigerant flowing from the condensing part 203 to the compressor 10 can be increased, so as to improve the supercharging effect. Similarly, when the air conditioning system operates in the heating mode, the second electronic expansion valve 2022 throttles, and the first electronic expansion valve 2021 is closed, so that the second bypass pipeline 2012 is connected, and the first bypass pipeline 2011 is disconnected. The refrigerant flowing out of the indoor heat exchanger 102 (condenser) flows into the refrigerant communication pipeline 105. Part of the refrigerant in the refrigerant communication pipeline 105 flows into the condensing part 203, exchanges heat with the evaporating part 204, and then flows into the throttling device 106 after throttling, and then flows into the outdoor heat exchanger 103. Another part of the refrigerant flowing out of the indoor heat exchanger 102 flows into the second bypass pipeline 2012 through the refrigerant communication pipeline 105, and then flows into the evaporating part 204 after throttling by the second electronic expansion valve 2022 of the second bypass pipeline 2012. In this way, the throttled and cooled refrigerant exchanges heat with the condensing part 203 in the evaporating part 204. In this way, in the heating mode, the refrigerant flowing into the evaporating part 204 is the refrigerant at the inlet of the condensing part 203. The pressure of the refrigerant at the inlet side of the condensing part 203 is higher than the pressure of the refrigerant at the outlet of the condensing part 203. In this way, the pressure of the refrigerant flowing into the evaporating part 204 can be increased, and the supercharging pressure of the gaseous refrigerant flowing from the condensing part 203 to the compressor 10 can be increased, so as to improve the supercharging effect. In this way, the air conditioning system of the embodiment of the present disclosure can not only supercharge and increase the enthalpy in the cooling and heating modes, but also ensure the supercharging pressure, so as to ensure that the refrigerant can be supercharged into the compressor 10, improve the exhaust capacity and the ability. Moreover, the liquid taking point of the compressor supercharging is after the first condensation in the cooling or heating mode, which can effectively improve the temperature and pressure of the supercharging.

[0049] In other optional embodiments, as Figure 3As shown, when the air conditioning system operates in the cooling mode, the refrigerant of the condensing portion 203 flows from the first end of the condensing portion 203 to the second end of the condensing portion 203, and the first electronic expansion valve 2021 is configured to be closed and the second electronic expansion valve 2022 is throttled; and / or, as shown, Figure 4 As shown, when the air conditioning system operates in the heating mode, the refrigerant of the condensing portion 203 flows from the second end of the condensing portion 203 to the first end of the condensing portion 203, and the second electronic expansion valve 2022 is configured to be closed and the first electronic expansion valve 2021 is throttled.

[0050] In the embodiments of the present disclosure, when the air conditioning system operates, the refrigerant of the evaporating portion 204 can also be taken from the outlet of the condensing portion 203, so that the heat exchange effect of the economizer 20 can also be ensured, and the temperature of the refrigerant flowing into the bypass pipeline 201 is lower, and the temperature of the refrigerant can be further reduced by the throttling device 106, thereby further reducing the temperature of the refrigerant of the evaporating portion 204, improving the heat exchange effect, improving the evaporation effect of the evaporating portion 204, and ensuring the amount of gaseous refrigerant.

[0051] Optionally, the air conditioning system further comprises a controller, the controller is electrically connected with the first electronic expansion valve 2021 and the second electronic expansion valve 2022, and the controller is configured to control the opening and closing of the first electronic expansion valve 2021 or the second electronic expansion valve 2022.

[0052] In the embodiments of the present disclosure, the first electronic expansion valve 2021 and the second electronic expansion valve 2022 are controlled to open and close by the controller, so that the air conditioning system can automatically adjust the opening and closing of the first electronic expansion valve 2021 and the second electronic expansion valve 2022 according to the operating mode or other parameters of the air conditioning system, improve the automation of the operation of the air conditioning system, and ensure the accuracy of the air supplementing process.

[0053] Optionally, as shown, Figures 1 to 4 As shown, the air conditioning system further comprises a first temperature sensor 2041 and a second temperature sensor 2042, the first temperature sensor 2041 is arranged at the inlet of the evaporating portion 204 and is used to detect the temperature of the refrigerant flowing out of the first electronic expansion valve 2021 and / or the second electronic expansion valve 2022; the second temperature sensor 2042 is arranged at the outlet of the evaporating portion 204 and is used to detect the temperature of the refrigerant flowing out of the evaporating portion 204; wherein the controller is electrically connected with the first temperature sensor 2041 and the second temperature sensor 2042, and the controller is configured to control the opening degree of the first electronic expansion valve 2021 or the second electronic expansion valve 2022 according to the temperature of the refrigerant detected by the first temperature sensor 2041 and / or the second temperature sensor 2042.

[0054] In the embodiments of the present disclosure, the second temperature sensor 2042 and the first temperature sensor 2041 are arranged at the outlet of the evaporating unit 204 and the inlet of the evaporating unit 204 respectively, so that the evaporation condition of the refrigerant in the evaporating unit 204 can be monitored in real time, and then the opening degree of the first electronic expansion valve 2021 or the second electronic expansion valve 2022 is controlled according to the evaporation condition, so as to adjust the evaporation effect of the evaporating unit 204, so that the refrigerant supplied to the compressor 10 by the evaporating unit 204 is all gaseous refrigerant, and liquid refrigerant is prevented from flowing into the compressor 10.

[0055] Optionally, the controller is configured to control the first electronic expansion valve 2021 or the second electronic expansion valve 2022 to reduce the opening degree when the temperature of the refrigerant flowing out of the evaporating unit 204 is less than the evaporation temperature threshold, and control the first electronic expansion valve 2021 or the second electronic expansion valve 2022 to maintain the opening degree when the temperature of the refrigerant flowing out of the evaporating unit 204 is greater than or equal to the evaporation temperature threshold.

[0056] In the embodiments of the present disclosure, the evaporation effect of the evaporating unit 204 is judged according to the temperature of the refrigerant at the outlet of the evaporating unit 204, so as to judge whether the refrigerant at the outlet of the evaporating unit 204 is completely evaporated into gaseous refrigerant. When the temperature of the refrigerant at the outlet of the evaporating unit 204 is greater than or equal to the evaporation temperature threshold, it is confirmed that the refrigerant at the outlet of the evaporating unit 204 is completely evaporated. When the temperature of the refrigerant at the outlet of the evaporating unit 204 is less than the evaporation temperature threshold, it is confirmed that the refrigerant at the outlet of the evaporating unit 204 is not completely evaporated, which indicates that the refrigerant flowing out of the evaporating unit 204 is not completely gaseous refrigerant. At this time, the opening degree of the electronic expansion valve 202 is adjusted to ensure that the refrigerant is completely evaporated into gaseous refrigerant, so as to avoid liquid refrigerant flowing into the compressor 10. The evaporation temperature threshold is calculated according to the temperature of the refrigerant at the inlet of the evaporating unit 204 detected by the first temperature sensor 2041.

[0057] Optionally, the air conditioning system further comprises a pressure sensor 108 arranged at the suction side of the compressor 10 and used for detecting the suction pressure; the pressure sensor 108 is electrically connected with the controller, and the controller is configured to receive the suction pressure of the compressor 10 detected by the pressure sensor 108, and control the working frequency of the compressor 10 according to the temperature of the refrigerant flowing out of the evaporating unit 204 and the suction pressure.

[0058] In the embodiments of the present disclosure, the suction pressure refers to the pressure of the refrigerant gas at the suction port of the compressor 10 in the air conditioning system. The suction pressure detected by the pressure sensor 108 can be used to calculate the refrigerant pressure after primary compression in the compressor 10, and then the temperature of the refrigerant at the outlet of the evaporating unit 204 can be used to calculate the charge pressure. According to the charge pressure and the refrigerant pressure after primary compression in the compressor 10, it can be judged whether the charge is smooth, and the working frequency of the compressor 10 is adjusted to ensure the smoothness of the charge.

[0059] Optionally, the controller is configured to obtain the refrigerant pressure of the first compressor 10 in the compressor 10 according to the suction pressure, and obtain the supercharging pressure of the refrigerant flowing out of the evaporating section 204, and in the case that the supercharging pressure is less than the refrigerant pressure of the first compressor 10 in the compressor 10, the controller controls the compressor 10 to increase the frequency until the supercharging pressure is greater than or equal to the refrigerant pressure of the first compressor 10 in the compressor 10.

[0060] In the embodiments of the present disclosure, the supercharging pressure is less than the refrigerant pressure of the first compressor 10 in the compressor 10, which indicates that the supercharging pressure is insufficient, and the refrigerant flowing out of the evaporating section 204 cannot flow into the compressor 10 smoothly. By increasing the frequency of the compressor 10, the working efficiency of the compressor 10 is improved, and thus the pressure of the refrigerant in the refrigerant circulation loop is increased, and the temperature of the refrigerant flowing out of the evaporating section 204 is also increased, so that the supercharging pressure is increased, and thus the refrigerant of the evaporating section 204 can flow into the compressor 10 smoothly, and the supercharging effect and the supercharging amount are ensured.

[0061] Optionally, as shown in Figure 5 The air conditioning system further comprises a third temperature sensor 2031 and a fourth temperature sensor 2032. The third temperature sensor 2031 is arranged at the first end of the condensing section 203 and is used to detect the refrigerant temperature at the first end of the condensing section 203. The fourth temperature sensor 2032 is arranged at the second end of the condensing section 203 and is used to detect the refrigerant temperature at the second end of the condensing section 203. The controller is electrically connected with the third temperature sensor 2031 and the fourth temperature sensor 2032, and is configured to control the opening degree of the first electronic expansion valve 2021 or the second electronic expansion valve 2022 according to the refrigerant temperature at the first end of the condensing section 203 and / or the refrigerant temperature at the second end of the condensing section 203.

[0062] In the embodiments of the present disclosure, both ends of the condensing section 203 are communicated with the refrigerant communication pipeline 105, that is, the condensing section 203 is arranged on the main path of the indoor heat exchanger 102 and the outdoor heat exchanger 103, and the condensing section 203 can further reduce the condensing temperature to ensure the condensing effect of the air conditioning system. By detecting the refrigerant temperature at the first end of the condensing section 203 and the refrigerant temperature at the second end of the condensing section 203, the condensing effect of the condensing section 203 can be confirmed, and the opening degree of the first electronic expansion valve 2021 or the second electronic expansion valve 2022 is controlled according to the condensing effect of the condensing section 203 to adjust the temperature of the refrigerant of the evaporating section 204, which can also adjust the condensing effect of the condensing section 203, and thus improve the condensing effect of the air conditioning system.

[0063] It can be understood that when the air conditioning system is in cooling mode, the refrigerant temperature at the first end of the condensing unit 203 is the inlet refrigerant temperature of the condensing unit 203, and the refrigerant temperature at the second end of the condensing unit 203 is the outlet refrigerant temperature of the condensing unit 203; when the air conditioning system is in heating mode, the second end of the condensing unit 203 is the inlet refrigerant temperature of the condensing unit 203, and the first end of the condensing unit 203 is the outlet temperature of the condensing unit 203.

[0064] Optionally, the controller is configured to control the first electronic expansion valve 2021 or reduce the opening degree when the inlet refrigerant temperature of the condensing unit 203 is greater than the condensation temperature threshold.

[0065] Here, when the first temperature sensor 2041 detects that the temperature of the inlet refrigerant of the condensing unit 203 is less than the condensation temperature threshold, it indicates that the refrigerant flowing out of the condenser is not completely condensed, at this time, the first electronic expansion valve 2021 or the second electronic expansion valve 2022 is controlled to reduce the opening degree, which can reduce the temperature of the refrigerant downstream of the first electronic expansion valve 2021 or the second electronic expansion valve 2022, thereby reducing the temperature of the evaporating unit 204, and further improving the heat exchange effect between the evaporating unit 204 and the condensing unit 203, reducing the temperature of the condensing unit 203, and improving the heat dissipation effect of the condensing unit 203.

[0066] Optionally, when the opening degree of the electronic expansion valve 202 is reduced to the first opening degree, and the real-time temperature of the outlet refrigerant of the condensing unit 203 is greater than or equal to the condensation temperature threshold, the controller controls the electronic expansion valve 202 to reset and increase the opening degree until the outlet refrigerant temperature of the condensing unit 203 is less than or equal to the condensation temperature threshold.

[0067] In the embodiments of the present disclosure, when the refrigerant of the condenser is not completely condensed, the controller controls the electronic expansion valve 202 to reduce the opening degree to reduce the temperature of the evaporating unit 204, and further improve the condensing effect of the condensing unit 203. When the opening degree of the electronic expansion valve 202 is reduced to the first opening degree, but the outlet refrigerant temperature of the condensing unit 203 is still high, it indicates that the refrigerant of the condensing unit 203 is still not completely condensed, at this time, the electronic expansion valve 202 is reset, and then the opening degree of the electronic expansion valve 202 is increased, which can increase the flow of the evaporating unit 204, so that the electronic expansion valve 202 still has a throttling effect, but the refrigerant flow of the evaporating unit 204 is increased, and the refrigerant flow for heat exchange with the condensing unit 203 is also increased, which can also improve the heat dissipation effect of the condensing unit 203, so that the temperature of the evaporating unit 204 after the electronic expansion valve 202 is less than the temperature of the condensing unit 203, and the temperature of the condensing unit 203 can be reduced, and the condensing effect is improved.

[0068] Optionally, the air conditioning system further comprises a heat sink 107, and the heat sink 107 is connected between the first throttling device 1061 and the second throttling device 1062.

[0069] In the embodiment of the present disclosure, the heat sink 107 can further condense the refrigerant flowing out of the condenser, and further improve the condensing effect.

[0070] Optionally, the heat sink 107 is located between the economizer 20 and the second throttling device 1062. In this way, when the air conditioner operates in the cooling mode, the refrigerant flowing out of the outdoor heat exchanger 103 (condenser) first flows through the heat sink 107 to be cooled, and then flows into the condensing part 203 and the evaporating part 204. In this way, the condensing effect of the condensing part 203 can be ensured, the electronic expansion valve 202 can be prevented from adjusting for the condensing effect of the condensing part 203, the evaporating effect of the evaporating part 204 can be ensured, and the refrigerant flowing into the compressor 10 can be ensured to be gaseous refrigerant. When the air conditioner operates in the heating mode, the refrigerant flowing out of the condensing part 203 flows into the heat sink 107 to be cooled. In this way, the electronic expansion valve 202 can be prevented from adjusting for the condensing effect of the condensing part 203, the evaporating effect of the evaporating part 204 can be ensured, and the refrigerant flowing into the compressor 10 can be ensured to be gaseous refrigerant.

[0071] Optionally, the outlet end of the evaporating part 204 is in communication with the middle-pressure cabin of the compressor 10.

[0072] In the embodiment of the present disclosure, the gaseous refrigerant flowing out of the evaporating part 204 flows into the middle-pressure cabin of the compressor 10, so that the gaseous refrigerant can be mixed with the refrigerant in the middle-pressure cabin, the temperature of the middle-pressure cabin is reduced, the refrigerant is compressed again, the operation efficiency is improved, and a large amount of liquid refrigerant is prevented from entering the compressor 10.

[0073] It can be understood that the outlet of the evaporating part 204 can also be in communication with the low-pressure cabin of the compressor 10, so as to reduce the temperature of the refrigerant in the low-pressure cabin of the compressor 10.

[0074] Optionally, the first port (d port) of the four-way valve 101 is in communication with the exhaust port of the compressor 10, the second port (s port) of the four-way valve 101 is in communication with the suction port of the compressor 10, the indoor heat exchanger 102 is in communication with the third port (e port) of the four-way valve 101, and the outdoor heat exchanger 103 is in communication with the fourth port (c port) of the four-way valve 101. The air conditioning system further comprises a gas-liquid separator 104, which is arranged between the second port of the four-way valve 101 and the suction port of the compressor 10. When the air conditioning system operates in the cooling mode, the evaporator comprises the indoor heat exchanger 102, and the condenser comprises the outdoor heat exchanger 103. When the air conditioning system operates in the heating mode, the evaporator comprises the outdoor heat exchanger 103, and the condenser comprises the indoor heat exchanger 102. The indoor heat exchanger 102 comprises a water-fluorine heat exchanger.

[0075] In the embodiments of the present disclosure, the gas-liquid separator 104 is arranged between the second port of the four-way valve 101 and the suction port of the compressor 10, so that the refrigerant flowing out of the second port of the four-way valve 101 enters the gas-liquid separator 104 to perform gas-liquid separation, and then the gaseous refrigerant flows into the compressor 10 to realize the backflow of the compressor 10.

[0076] For example, when the air conditioning system operates in the cooling mode, the first port and the fourth port of the four-way valve 101 are communicated, and the second port and the third port of the four-way valve 101 are communicated. The high-temperature and high-pressure refrigerant flowing out of the compressor 10 flows into the outdoor heat exchanger 103 (condenser) through the first port and the fourth port of the four-way valve 101. At this time, the second throttling device 1062 is fully opened and does not play a throttling role. The refrigerant flowing out of the outdoor heat exchanger 103 is cooled by the radiator 107, and then part of the refrigerant flows into the condensing portion 203, and the other part flows into the first bypass pipeline 2011, is throttled by the first electronic expansion valve 2021, and then flows into the evaporating portion 204. After the evaporating portion 204 and the condensing portion 203 of the economizer 20 exchange heat, the gaseous refrigerant of the evaporating portion 204 flows into the compressor 10 to perform backflow. The refrigerant of the condensing portion 203 is further condensed, throttled by the first throttling device 1061, and then flows into the indoor heat exchanger 102 (evaporator) to evaporate. Finally, the refrigerant sequentially flows into the gas-liquid separator 104 through the third port and the second port of the four-way valve 101 to perform gas-liquid separation, and the gaseous refrigerant flows back into the compressor 10.

[0077] When the air conditioning system operates in the heating mode, the first port and the third port of the four-way valve 101 are communicated, and the second port and the fourth port of the four-way valve 101 are communicated. The high-temperature and high-pressure refrigerant flowing out of the compressor 10 sequentially flows into the indoor heat exchanger 102 (condenser) through the first port and the third port of the four-way valve 101 to perform condensation and heat dissipation. At this time, the first throttling device 1061 is fully opened and does not play a throttling role. Then, part of the refrigerant flows into the condensing portion 203, and the other part of the refrigerant flows into the second bypass pipeline 2012, is throttled by the second electronic expansion valve 2022, and then flows into the evaporating portion 204. After the refrigerant of the condensing portion 203 and the evaporating portion 204 exchanges heat, the gaseous refrigerant of the evaporating portion 204 flows into the compressor 10 to perform backflow. The refrigerant of the condensing portion 203 flows into the radiator 107 to perform recooling and condensation, and then flows into the outdoor heat exchanger 103 (evaporator) to perform evaporation and heat absorption. Then, the refrigerant sequentially flows into the gas-liquid separator 104 through the fourth port and the second port of the four-way valve 101 to perform gas-liquid separation, and the gaseous refrigerant after the separation flows back into the compressor 10.

[0078] Optionally, the indoor heat exchanger 102 comprises a water-fluorine heat exchanger. The fluorine side of the water-fluorine heat exchanger is communicated with the compressor 1010 and the outdoor heat exchanger 103, and the water side of the water-fluorine heat exchanger is communicated with a water heat exchange system, which can be a floor heating system or a water heater.

[0079] Optionally, the water-fluorine heat exchanger is a plate heat exchanger or a double-pipe heat exchanger.

[0080] Optionally, when the water circuit of the water-fluorine heat exchanger is communicated with the floor heating, the air conditioning system further comprises an air disc, which is arranged in parallel with the floor heating between the water inlet and the water outlet of the water circuit of the water-fluorine heat exchanger.

[0081] Optionally, the water inlet pipe of the floor heating is provided with a valve, which can control the on-off of the floor heating and the water circuit of the water-fluorine heat exchanger.

[0082] Optionally, the air conditioning system further comprises a water tank, which comprises a hot water area and a cold water area, the hot water area is communicated with the water outlet of the water-fluorine heat exchanger, the cold water area is communicated with an external water source, the water tank has a water outlet, the water outlet is communicated with the cold water area and the hot water area, the water outlet is communicated with the hot water area through a first pipe, the water outlet is communicated with the cold water pipe through a second pipe, the first pipe is provided with a first switch, and the second pipe is provided with a second switch, so that by controlling the opening and closing of the first switch and the second switch, the water outlet can flow out the water of the cold water area, or the water of the hot water area, or the mixed water of the cold water and the hot water, so as to meet different use requirements of users.

[0083] Optionally, the air conditioning system further comprises a liquid storage tank, which is arranged between the throttling device 106 and the condenser.

[0084] Optionally, the air conditioning system further comprises a high-pressure pressure sensor 109, which is arranged between the exhaust port of the compressor 10 and the four-way valve 101, and is used for detecting the high-pressure pressure of the air conditioning system.

[0085] The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable one skilled in the art to practice them. Other embodiments can include structural and other changes. The embodiments represent only the possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be changed. Parts and features of some embodiments can be included or replaced by parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and can be variously modified and changed without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An air conditioning system, characterized in that, include: The refrigerant circulation loop includes a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger. The indoor and outdoor heat exchangers are connected through a refrigerant connection pipe, and the throttling device is located in the refrigerant connection pipe. An economizer includes an evaporator and a condenser with heat exchange facilities. The condenser is located in and connected to the refrigerant connection pipeline, and the evaporator is connected between the refrigerant connection pipeline and the compressor. The bypass pipeline includes a first bypass pipeline and a second bypass pipeline. The first bypass pipeline is connected between the first end of the condenser section and the inlet of the evaporator section, and the second bypass pipeline is connected between the second end of the condenser section and the inlet of the evaporator section. The electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve. The first electronic expansion valve is located in the first bypass pipeline and upstream of the evaporation section; the second electronic expansion valve is located in the second bypass pipeline and upstream of the evaporation section.

2. The air conditioning system according to claim 1, characterized in that, When the air conditioning system is operating in cooling mode, the refrigerant in the condenser flows from the first end of the condenser to the second end of the condenser, and the first electronic expansion valve is configured to throttle, while the second electronic expansion valve is closed; and / or, when the air conditioning system is operating in heating mode, the refrigerant in the condenser flows from the second end of the condenser to the first end of the condenser, and the second electronic expansion valve is configured to throttle, while the first electronic expansion valve is closed.

3. The air conditioning system according to claim 1, characterized in that, Also includes: The controller is electrically connected to both the first and second electronic expansion valves, and is configured to control the opening degree of either the first or the second electronic expansion valve.

4. The air conditioning system according to claim 3, characterized in that, Also includes: The first temperature sensor is located at the inlet of the evaporator section and is used to detect the temperature of the refrigerant flowing out of the first electronic expansion valve and / or the second electronic expansion valve. The second temperature sensor is located at the outlet of the evaporator section and is used to detect the temperature of the refrigerant flowing out of the evaporator section. The controller is electrically connected to both the first and second temperature sensors, and is configured to control the opening degree of the first or second electronic expansion valve based on the refrigerant temperature detected by the first and / or second temperature sensors.

5. The air conditioning system according to claim 4, characterized in that, Also includes: A pressure sensor, located on the suction side of the compressor, is used to detect suction pressure; The controller is electrically connected to both the compressor and the pressure sensor. The controller is configured to control the operating frequency of the compressor based on the temperature of the refrigerant flowing out of the evaporator and the suction pressure.

6. The air conditioning system according to claim 3, characterized in that, Also includes: The third temperature sensor is located at the first end of the condenser section and is used to detect the refrigerant temperature at the first end of the condenser section. The fourth temperature sensor is located at the second end of the condenser section and is used to detect the refrigerant temperature at the second end of the condenser section. The controller is electrically connected to both the third and fourth temperature sensors. The controller is configured to control the opening degree of the first or second electronic expansion valve based on the refrigerant temperature at the first end of the condenser and / or the refrigerant temperature at the second end of the condenser.

7. The air conditioning system according to claim 1, characterized in that, The number of throttling devices is multiple, including a first throttling device and a second throttling device arranged sequentially along the direction from the indoor heat exchanger to the outdoor heat exchanger; The condenser section is connected between the first throttling device and the second throttling device. When the air conditioning system is operating in cooling mode, the first throttling device is configured to throttle, and the second throttling device is configured to be fully open. The condenser section and the first throttling device are arranged sequentially along the refrigerant flow direction in the refrigerant connecting pipe. When the air conditioning system is operating in heating mode, the second throttling device is configured to throttle, and the first throttling device is configured to be fully open. The condenser section and the second throttling device are arranged sequentially along the refrigerant flow direction in the refrigerant connecting pipe.

8. The air conditioning system according to claim 7, characterized in that, Also includes: A radiator is connected between the first throttling device and the second throttling device.

9. The air conditioning system according to claim 1, characterized in that, The outlet of the evaporator is connected to the intermediate pressure chamber of the compressor.

10. The air conditioning system according to any one of claims 1 to 9, characterized in that, The first port of the four-way valve is connected to the compressor's exhaust port, the second port of the four-way valve is connected to the compressor's suction port, the third port of the four-way valve is connected to the indoor heat exchanger, and the fourth port of the four-way valve is connected to the indoor heat exchanger. The air conditioning system also includes: A gas-liquid separator is located between the second port of the four-way valve and the suction port of the compressor; The indoor heat exchanger includes a water-fluorine heat exchanger.

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