Outdoor Unit, Air Conditioning System, Control Method Thereof, and Computer Readable Storage Medium

Abstract

The present application provides an outdoor unit, an air conditioning system, a control method thereof, and a computer-readable storage medium, including an outdoor heat exchanger, a compressor, and a first economizer. The exhaust port of the compressor is connected to the outdoor heat exchanger or a switching device. The first economizer is provided with a first main passage, a first auxiliary passage, and a first throttling device. One end of the first main passage is connected to the indoor unit through the switching device, and the other end is connected to the compressor through the outdoor heat exchanger and the first auxiliary passage respectively. The first throttling device is installed in the first auxiliary passage. The present application can adjust the refrigerant flow rate of the first auxiliary passage through the first throttling device, thereby adjusting the temperature difference between the inlet and outlet of the first main passage, and improving the low-temperature heating capacity; the modification and cost impact of the present application are small, the conversion operability is strong, the development cycle is short, and it can be quickly put on the market; moreover, it can reduce the production cost, improve the safety and reliability, and reduce the heating cost.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and particularly relates to an outdoor unit, an air conditioning system, a control method thereof, and a computer-readable storage medium. Background Art

[0002] In the related art, for some three-pipe air conditioning systems, they can achieve multiple modes such as all indoor units cooling, main cooling, all indoor units heating, and main heating.

[0003] Among them, in order to improve its heat exchange capacity, a three-pipe air conditioning system often adds an ejector enthalpy-increasing device. However, for the case of all indoor units heating or most indoor units heating, as the ambient temperature continuously decreases, its heating capacity will become worse and worse. For example, at -25°C, the maximum capacity of the air conditioning system in a stable state is basically only 44% of the rated capacity level, which is likely to cause user complaints when applied to household occasions and has poor market competitiveness.

[0004] In response to the above-mentioned low-temperature heating problem, the existing measure is to add an electric auxiliary heating function to the indoor unit. Since this measure can only be achieved through customization, the cycle is long, and the safety risk and reliability risk will increase. In addition, it will also cause the energy efficiency of the system to decrease, thus greatly increasing the heating cost of users. Summary of the Invention

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present application provides an outdoor unit, an air conditioning system, a control method thereof, and a computer-readable storage medium, aiming to improve the low-temperature heating capacity of the air conditioning system.

[0006] In a first aspect, an embodiment of the present application provides an outdoor unit, including:

[0007] An outdoor heat exchanger;

[0008] A compressor, the exhaust port of the compressor is used to communicate with the outdoor heat exchanger or communicate with a plurality of indoor units through a switching device, wherein the switching device is used to control the plurality of indoor units to execute a cooling mode, a heating mode, or a cooling and heating mixed mode;

[0009] A first economizer, which is provided with a first main path channel, a first auxiliary path channel, and a first throttling device. One end of the first main path channel is used to communicate with the plurality of indoor units through the switching device, and the other end is respectively communicated with the compressor through the outdoor heat exchanger and the first auxiliary path channel. The first throttling device is installed at one end where the first auxiliary path channel communicates with the first main path channel.

[0010] According to some embodiments of the present application, the first economizer is further provided with a first temperature sensor and a second temperature sensor. The first temperature sensor is installed at one end of the first main path channel communicating with the switching device, and the second temperature sensor is installed at one end of the first main path channel communicating with the outdoor heat exchanger.

[0011] According to some embodiments of the present application, the first economizer is further provided with a third temperature sensor and a fourth temperature sensor. The third temperature sensor is installed at one end of the first auxiliary path channel communicating with the first main path channel, and the fourth temperature sensor is installed at one end of the first auxiliary path channel communicating with the compressor.

[0012] According to some embodiments of the present application, the outdoor unit is further provided with a fifth temperature sensor for detecting the outdoor ambient temperature.

[0013] According to some embodiments of the present application, the outdoor unit further includes a second economizer, which is provided with a second main path channel, a second auxiliary path channel and a second throttling device. One end of the second main path channel communicates with the first main path channel, and the other end is used to communicate with a plurality of indoor units through the switching device, and also communicates with the suction port and the gas replenishing port of the compressor through the second auxiliary path channel. The second throttling device is installed at one end of the second auxiliary path channel communicating with the second main path channel.

[0014] According to some embodiments of the present application, the outdoor unit is further provided with a first branch channel and a second branch channel. The second auxiliary path channel communicates with the suction port of the compressor through the first branch channel, and the second auxiliary path channel communicates with the gas replenishing port of the compressor through the second branch channel. Wherein, flow regulating valves are installed in both the first branch channel and the second branch channel.

[0015] In a second aspect, embodiments of the present application provide an air conditioning system, including a switching device, a plurality of indoor units and the outdoor unit of the first aspect above. The switching device is arranged between the outdoor unit and the plurality of indoor units.

[0016] According to some embodiments of the present application, in the pure heating mode or the main heating mode, the refrigerant discharged from the exhaust port of the compressor flows through the switching device and the indoor units and then enters the first main path channel. A part of the refrigerant flowing out of the first main path channel flows through the outdoor heat exchanger and then enters the suction port of the compressor, and another part of the refrigerant flows through the first auxiliary path channel and then enters the suction port of the compressor. Wherein, in the main heating mode, the ratio of the number of indoor units in the heating mode to the number of indoor units in the cooling mode is greater than a preset value.

[0017] According to some embodiments of the present application, the switching device includes a plate heat exchanger. In the cooling and heating mixed mode, a plurality of the indoor units include a first indoor unit in the heating mode and a second indoor unit in the cooling mode; the refrigerant discharged from the exhaust port of the compressor flows through the switching device and then enters the first indoor unit, and a part of the refrigerant flowing out of the first indoor unit flows through the switching device and then enters the first main path channel, and another part of the refrigerant flows through the plate heat exchanger and the second indoor unit and then flows into the suction port of the compressor.

[0018] According to some embodiments of the present application, in the cooling mode, the refrigerant discharged from the exhaust port of the compressor flows through the outdoor heat exchanger and then enters the first main path channel, and the refrigerant flowing out of the first main path channel flows through the switching device and the indoor unit and then enters the suction port of the compressor.

[0019] In a third aspect, an embodiment of the present application provides a control method for an air conditioning system, which is applied to the air conditioning system in the second aspect above; the control method includes:

[0020] In the case of the main heating mode or the pure heating mode, obtain the outdoor ambient temperature and the current temperature difference between the inlet and the outlet of the first main path channel, wherein, in the main heating mode, the ratio of the number of indoor units in the heating mode to the number of indoor units in the cooling mode is greater than a preset value;

[0021] Determine the target temperature difference between the inlet and the outlet of the first main path channel according to the outdoor ambient temperature;

[0022] Adjust the opening degree of the first throttling device according to the current temperature difference and the target temperature difference.

[0023] According to some embodiments of the present application, the control method further includes:

[0024] Obtain the current exhaust superheat degree of the compressor;

[0025] Adjust the opening degree of the first throttling device according to the current exhaust superheat degree and a preset superheat degree.

[0026] According to some embodiments of the present application, the adjusting the opening degree of the first throttling device according to the current exhaust superheat degree and the preset superheat degree includes at least one of the following:

[0027] When the current exhaust superheat degree is less than a first preset superheat degree, control the first throttling device to close;

[0028] When the current exhaust superheat degree is greater than a second preset superheat degree, control the first throttling device to open, wherein the second preset superheat degree is greater than or equal to the first preset superheat degree.

[0029] According to some embodiments of the present application, the control method further includes:

[0030] When a defrosting signal or an oil return signal is received, control the first throttling device to close.

[0031] According to some embodiments of the present application, the air conditioning system further includes a second economizer, the second economizer is provided with a second main passage, a second auxiliary passage and a second throttling device, one end of the second main passage communicates with the first main passage, the other end communicates with a plurality of the indoor units through the switching device, and also communicates with the suction port and the gas replenishing port of the compressor through the second auxiliary passage, the second throttling device is installed at one end where the second auxiliary passage communicates with the second main passage; the control method further includes:

[0032] When a fault signal is received, control the first throttling device and the second throttling device to close, where the fault signal includes at least one of the following: a fault shutdown signal, a temperature reach shutdown signal, an inlet end sensor fault signal of the second throttling device, an outlet end sensor fault signal of the second throttling device.

[0033] In a fourth aspect, an embodiment of the present application provides a controller, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor runs the computer program, it executes the control method of the air conditioning system as described in the third aspect above.

[0034] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, storing computer-executable instructions, and the computer-executable instructions are used to execute the control method of the air conditioning system as described in the third aspect above.

[0035] According to the technical solution of the embodiment of the present application, it has at least the following beneficial effects: Since the first economizer is added to the outdoor unit in the embodiment of the present application, and the first economizer is provided with the first throttling device, the refrigerant flow rate of the first auxiliary passage can be adjusted through the first throttling device, so as to adjust the heat exchange degree between the first auxiliary passage and the first main passage, and further adjust the temperature difference between the inlet and the outlet of the first main passage, thereby improving the low-temperature heating capacity of the air conditioning system; Secondly, the modification and cost impact of the embodiment of the present application are small, the conversion and operability are strong, and the development cycle is short, and it can be quickly deployed in the market; In addition, the indoor unit of the embodiment of the present application does not need to be customized to increase the electric auxiliary heating function, so as to reduce the production cost of the air conditioning system, improve the safety and reliability, and also reduce the heating cost of users.

[0036] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned by practice of the present application. Description of the Drawings

[0037] The drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0038] Figure 1 is a schematic diagram of a system architecture platform for implementing the control method of an air conditioning system provided by an embodiment of the present application;

[0039] Figure 2 is a schematic structural diagram of an outdoor unit provided by an embodiment of the present application;

[0040] Figure 3 is a schematic structural diagram of an air conditioning system provided by an embodiment of the present application;

[0041] Figure 4 is a flowchart of the control method of an air conditioning system provided by an embodiment of the present application;

[0042] Figure 5 is a flowchart of the control method of an air conditioning system provided by another embodiment of the present application;

[0043] Figure 6 is a flowchart of the control method of an air conditioning system provided by another embodiment of the present application;

[0044] Figure 7 is a flowchart of the control method of an air conditioning system provided by another embodiment of the present application;

[0045] Figure 8 is a flowchart of the control method of an air conditioning system provided by another embodiment of the present application;

[0046] Figure 9 is a flowchart of the control method of an air conditioning system provided by another embodiment of the present application;

[0047] Figure 10 is the overall flowchart of the control method of an air conditioning system provided by an embodiment of the present application. Detailed Description of the Embodiments

[0048] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application.

[0049] In the description of the present application, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0050] In the description of the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the recited number, and understandings such as "above", "below", "within", etc. include the recited number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0051] In the description of the present application, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0052] In some cases, for some three-pipe air-conditioning systems, they can achieve multiple modes such as all indoor units cooling, main cooling, all indoor units heating, main heating, etc. Among them, in order to improve its own heat exchange capacity, a three-pipe air-conditioning system often adds an ejector enthalpy-increasing device. However, for the situation of all indoor units heating or most indoor units heating, as the ambient temperature continuously decreases, its heating capacity will become worse and worse. For example, at -25°C, the maximum capacity of the air-conditioning system in a stable state is basically only 44% of the nominal capacity level, which is likely to cause user complaints when applied to household occasions and has poor market competitiveness.

[0053] In response to this, in order to address the above-mentioned low-temperature heating problem, the existing measure is to add an electric auxiliary heating function to the indoor unit. Since this measure can only be implemented through customization, the cycle is long and the safety risk and reliability risk will increase. In addition, it will also cause the energy efficiency of the system to decrease, thus greatly increasing the heating cost of users.

[0054] Based on the above situation, the embodiments of the present application propose an outdoor unit, an air-conditioning system, its control method, and a computer-readable storage medium, aiming to improve the low-temperature heating capacity of the air-conditioning system.

[0055] The following further elaborates on the embodiments of the present application with reference to the drawings.

[0056] As Figure 1 shown, Figure 1 is a schematic diagram of a system architecture platform for executing the control method of an air-conditioning system provided by an embodiment of the present application.

[0057] The system architecture platform 100 of the embodiment of the present application includes one or more processors 110 and a memory 120. Figure 1 Taking one processor 110 and one memory 120 as an example.

[0058] The processor 110 and the memory 120 can be connected through a bus or other means. Figure 1 Taking the connection through a bus as an example.

[0059] The memory 120, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 120 can include high-speed random access memory, and can also include non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 120 optionally includes a memory 120 remotely set relative to the processor 110, and these remote memories can be connected to the system architecture platform 100 through a network. Examples of the above-mentioned network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0060] Those skilled in the art can understand that Figure 1 the device structure shown does not limit the system architecture platform 100, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0061] In Figure 1 the system architecture platform 100 shown, the processor 110 can be used to call the control program of the air-conditioning system stored in the memory 120, so as to implement the control method of the air-conditioning system.

[0062] Based on the hardware structure of the above system architecture platform 100, various embodiments of the outdoor unit and the air-conditioning system of the present application are proposed.

[0063] As Figures 2 to 3 shown, Figure 2 is a schematic structural diagram of an outdoor unit provided by an embodiment of the present application; Figure 3 is a schematic structural diagram of an air-conditioning system provided by an embodiment of the present application. Among them, Figure 2 and Figure 3 the solid arrows in are the heating directions, and the dashed arrows are the cooling directions.

[0064] In one embodiment, the outdoor unit 200 of the embodiments of the present application includes, but is not limited to, a compressor 210, an outdoor heat exchanger 220, and a first economizer 230. Specifically, the exhaust port of the compressor 210 is communicated with the outdoor heat exchanger 220 or is communicated with a plurality of indoor units 400 through a switching device 300. Among them, the switching device 300 can control the plurality of indoor units 400 to execute a cooling and heating hybrid mode, a heating mode, or a cooling mode. In addition, the first economizer 230 is provided with a first main passage 231, a first auxiliary passage 232, and a first throttling device EEVC1. One end of the first main passage 231 is communicated with the plurality of indoor units 400 through the switching device 300, and the other end is respectively communicated with the compressor 210 through the outdoor heat exchanger 220 and the first auxiliary passage 232. The first throttling device EEVC1 is installed at one end where the first auxiliary passage 232 is communicated with the first main passage 231.

[0065] Since the embodiments of the present application add a first economizer 230 to the outdoor unit 200, and the first economizer 230 is provided with a first throttling device EEVC1, the refrigerant flow rate of the first auxiliary passage 232 can be adjusted through the first throttling device EEVC1, so as to adjust the heat exchange degree between the first auxiliary passage 232 and the first main passage 231, and further adjust the temperature difference between the inlet and outlet of the first main passage 231, thereby improving the low-temperature heating capacity of the air-conditioning system. Secondly, the modifications and cost impacts of the embodiments of the present application are small, the conversion operability is strong, the development cycle is short, and it can be quickly deployed in the market. In addition, the indoor unit 400 of the embodiments of the present application does not need to be customized to increase the electric auxiliary heating function, so as to reduce the production cost of the air-conditioning system, improve the safety and reliability, and also reduce the heating cost of users.

[0066] It should be noted that in the heating mode or the heating and cooling hybrid mode, first, the refrigerant discharged from the exhaust port of the compressor 210 will flow through the switching device 300 and the indoor unit 400 for heat exchange. Then, the heat-exchanged refrigerant will continue to flow into the first main passage 231 of the first economizer 230 of the outdoor unit 200. Next, a part of the refrigerant passing through the first main passage 231 will flow through the outdoor heat exchanger 220 for heat exchange and flow into the suction port of the compressor 210, while another part of the refrigerant will flow through the first auxiliary passage 232 and flow into the suction port of the compressor 210.

[0067] In addition, it should be noted that in the cooling mode, first, the refrigerant discharged from the exhaust port of the compressor 210 will flow through the outdoor heat exchanger 220 for heat exchange. Then, the heat-exchanged refrigerant will continue to flow into the first main passage 231 of the first economizer 230. Next, the refrigerant passing through the first main passage 231 will flow through the switching device 300 and the indoor unit 400 for heat exchange. Finally, the heat-exchanged refrigerant will flow into the suction port of the compressor 210.

[0068] It should be noted that for the above-mentioned first economizer 230, the first main passage 231 and the first auxiliary passage 232 are close to each other and isolated at the same time. Since the refrigerant will become a low-temperature and low-pressure refrigerant after passing through the first throttling device EEVC1, the refrigerant flowing through the first auxiliary passage 232 is a low-temperature and low-pressure refrigerant, so that it can exchange heat with the refrigerant in the first main passage 231, thereby cooling the refrigerant in the first main passage 231.

[0069] It can be understood that the above-mentioned first economizer 230 can be a plate heat exchanger, a shell-and-tube heat exchanger, a flash evaporator, or other structural forms. The embodiment of the present application does not specifically limit the structural form of the first economizer 230.

[0070] In addition, it can be understood that the above-mentioned first throttling device EEVC1 can be an electronic expansion valve, and its structure can be composed of three parts: detection, control, and execution. Its advantages are a large flow regulation range, high control accuracy, suitable for intelligent control, and can adapt to the rapid change of the refrigerant flow rate with high efficiency. In other words, the electronic expansion valve can be regarded as an intelligent capillary tube with a variable inner diameter.

[0071] In an embodiment, the outdoor unit 200 of the embodiment of the present application further includes, but is not limited to, a first temperature sensor T1 and a second temperature sensor T2. Among them, the first temperature sensor T1 is installed at one end of the first main passage 231 communicating with the switching device 300, and the second temperature sensor T2 is installed at one end of the first main passage 231 communicating with the outdoor heat exchanger 220.

[0072] Specifically, the embodiment of the present application can detect the first refrigerant temperature at one end of the first main passage 231 communicating with the switching device 300 through the first temperature sensor T1, and can also detect the second refrigerant temperature at one end of the first main passage 231 communicating with the outdoor heat exchanger 220 through the second temperature sensor T2. Then, by calculating the difference between the first refrigerant temperature and the second refrigerant temperature, the temperature difference before and after the refrigerant flows through the first main passage 231 can be obtained, thereby inferring the current heat exchange degree of the first main passage 231 of the first economizer 230.

[0073] For example, in the case of the heating mode or the heating and cooling hybrid mode, the refrigerant flowing out of the switching device 300 will flow through the first main path channel 231 of the first economizer 230 to the outdoor heat exchanger 220. That is, one end of the first main path channel 231 connected to the switching device 300 is the inlet of the first main path channel 231, and one end of the first main path channel 231 connected to the outdoor heat exchanger 220 is the outlet of the first main path channel 231. During operation, the embodiment of the present application can monitor the refrigerant temperature at the inlet of the first main path channel 231 in real time through the first temperature sensor T1, and at the same time monitor the refrigerant temperature at the outlet of the first main path channel 231 in real time through the second temperature sensor T2. Then, subtracting the outlet refrigerant temperature from the inlet refrigerant temperature can calculate the refrigerant temperature difference between the inlet and the outlet of the first main path channel 231, so as to infer the current heat exchange degree of the first main path channel 231 of the first economizer 230.

[0074] It should be noted that if the refrigerant temperature difference is large, it indicates that the heat exchange effect between the refrigerant in the first main path channel 231 and the refrigerant in the first auxiliary path channel 232 is strong, and it can also be inferred that the current opening degree of the first throttling device EEVC1 is large; if the refrigerant temperature difference is small, it indicates that the heat exchange effect between the refrigerant in the first main path channel 231 and the refrigerant in the first auxiliary path channel 232 is weak, and it can also be inferred that the current opening degree of the first throttling device EEVC1 is small.

[0075] It can be understood that the above-mentioned first temperature sensor T1 and second temperature sensor T2 refer to sensors that can sense temperature and convert it into an available output signal. According to the measurement method, they can be divided into two categories: contact type and non-contact type. According to the sensor material and electronic component characteristics, they are divided into two categories: thermal resistance and thermocouple.

[0076] For example, the main types of temperature sensors include the following: thermocouples, thermistors, resistance temperature detectors (RTDs), and IC temperature sensors. Among them, a thermocouple is a temperature-sensing element that can directly measure temperature and convert the temperature signal into a thermoelectromotive force signal, which is then converted into the temperature of the measured medium through an electrical instrument. The basic principle of thermocouple temperature measurement is that a closed loop is formed by two conductors of different materials. When there is a temperature gradient at both ends, there will be current flowing through the loop, and at this time, there is an electromotive force between the two ends, that is, the Seebeck effect. Secondly, the main component of a thermistor sensor is a thermistor. When there is thermal radiation around the thermosensitive material, it will absorb the radiant heat, causing the temperature to rise and the resistance value of the material to change. Secondly, resistance temperature detectors usually use platinum, copper, or nickel, which have a large temperature coefficient, respond quickly to temperature changes, can resist thermal fatigue, and are easy to process into precise coils. In addition, an IC temperature sensor is made using silicon semiconductor integration technology. It is a dedicated IC that integrates a temperature sensor on a chip and can complete temperature measurement and analog signal output functions. The main characteristics of an analog integrated temperature sensor are single function, small temperature measurement error, low price, fast response speed, long transmission distance, small size, low power consumption, etc. It is suitable for long-distance temperature measurement and detection, does not require nonlinear calibration, and has a simple peripheral circuit.

[0077] In one embodiment, the outdoor unit 200 of the embodiment of the present application further includes, but is not limited to, a third temperature sensor T3 and a fourth temperature sensor T4. Among them, the third temperature sensor T3 is installed at one end where the first auxiliary passage 232 communicates with the first main passage 231, and the fourth temperature sensor T4 is installed at one end where the first auxiliary passage 232 communicates with the compressor 210.

[0078] Specifically, the embodiment of the present application can detect the third refrigerant temperature at one end where the first auxiliary passage 232 communicates with the first main passage 231 through the third temperature sensor T3, and can also detect the fourth refrigerant temperature at one end where the first auxiliary passage 232 communicates with the return air port through the fourth temperature sensor T4. Then, by calculating the difference between the third refrigerant temperature and the fourth refrigerant temperature, the temperature difference before and after the refrigerant flows through the first auxiliary passage 232 can be obtained, thereby inferring the current heat exchange degree of the first auxiliary passage 232 of the first economizer 230.

[0079] For example, in the case of the heating mode or the heating and cooling hybrid mode, the refrigerant flowing out of the switching device 300 will flow through the first main path channel 231 of the first economizer 230 to the outdoor heat exchanger 220. That is, one end of the first main path channel 231 connected to the switching device 300 is the inlet of the first main path channel 231, and one end of the first main path channel 231 connected to the outdoor heat exchanger 220 is the outlet of the first main path channel 231. Then, a part of the refrigerant at the outlet of the first main path channel 231 will flow through the first throttling device EEVC1 through the first auxiliary path channel 232. That is, one end of the first auxiliary path channel 232 connected to the outlet of the first main path channel 231 is the inlet of the first auxiliary path channel 232, and one end of the first auxiliary path channel 232 connected to the suction port of the compressor 210 is the outlet of the first auxiliary path channel 232. During operation, the embodiment of the present application can monitor the refrigerant temperature at the inlet of the first auxiliary path channel 232 in real time through the third temperature sensor T3, and at the same time monitor the refrigerant temperature at the outlet of the first auxiliary path channel 232 in real time through the fourth temperature sensor T4. Then, subtracting the inlet refrigerant temperature from the outlet refrigerant temperature can calculate the refrigerant temperature difference between the outlet and the inlet of the first auxiliary path channel 232, so as to infer the current heat exchange degree of the first auxiliary path channel 232 of the first economizer 230.

[0080] It should be noted that if the refrigerant temperature difference is large, that is, the temperature rise amplitude of the refrigerant in the first auxiliary path channel 232 is large, it can be inferred that the refrigerant amount in the first auxiliary path channel 232 may be small, that is, it indicates that the current opening degree of the first throttling device EEVC1 is small; if the refrigerant temperature difference is small, that is, the temperature rise amplitude of the refrigerant in the first auxiliary path channel 232 is small, it can be inferred that the refrigerant amount in the first auxiliary path channel 232 may be large, that is, it indicates that the current opening degree of the first throttling device EEVC1 is large.

[0081] It can be understood that the above-mentioned third temperature sensor T3 and fourth temperature sensor T4 refer to sensors that can sense temperature and convert it into an available output signal. According to the measurement method, they can be divided into two categories: contact type and non-contact type. According to the sensor material and electronic component characteristics, they are divided into two categories: thermal resistance and thermocouple.

[0082] For example, the main types of temperature sensors include the following: thermocouples, thermistors, resistance temperature detectors (RTDs), and IC temperature sensors. Among them, a thermocouple is a temperature-sensing element that can directly measure temperature and convert the temperature signal into a thermoelectromotive force signal, which is then converted into the temperature of the measured medium through an electrical instrument. The basic principle of thermocouple temperature measurement is that a closed loop is formed by two conductors of different compositions. When there is a temperature gradient at both ends, there will be current flowing through the loop, and at this time, there is an electromotive force between the two ends, that is, the Seebeck effect. Secondly, the main component of a thermistor sensor is a thermistor. When there is thermal radiation around the thermosensitive material, it will absorb the radiant heat, resulting in a temperature increase and causing a change in the resistance of the material. Secondly, resistance temperature detectors usually use platinum, copper, or nickel, which have a large temperature coefficient, respond quickly to temperature changes, can resist thermal fatigue, and are easy to process into precise coils. In addition, an IC temperature sensor is made using silicon semiconductor integration technology. It is a dedicated IC that integrates a temperature sensor on a chip and can complete temperature measurement and analog signal output functions. The main characteristics of an analog integrated temperature sensor are single function, small temperature measurement error, low price, fast response speed, long transmission distance, small size, low power consumption, etc. It is suitable for long-distance temperature measurement and detection, does not require non-linear calibration, and has a simple peripheral circuit.

[0083] In one embodiment, the outdoor unit 200 of the embodiment of the present application further includes, but is not limited to, a fifth temperature sensor, where the fifth temperature sensor can be installed at any position capable of measuring the outdoor ambient temperature.

[0084] Specifically, the embodiment of the present application can detect the current outdoor ambient temperature through the fifth temperature sensor, and then determine the current low temperature degree according to the current outdoor ambient temperature, so as to facilitate the adjustment of the valve size of the first throttling device EEVC1 in the subsequent stage.

[0085] It can be understood that the above-mentioned fifth temperature sensor refers to a sensor that can sense temperature and convert it into an available output signal. According to the measurement method, it can be divided into two categories: contact type and non-contact type. According to the sensor material and electronic component characteristics, it can be divided into two categories: thermal resistance and thermocouple.

[0086] For example, the main types of temperature sensors include the following: thermocouples, thermistors, resistance temperature detectors (RTDs), and IC temperature sensors. Among them, a thermocouple is a temperature-sensing element that can directly measure temperature, convert the temperature signal into a thermal electromotive force signal, and convert it into the temperature of the measured medium through an electrical instrument. The basic principle of thermocouple temperature measurement is that a closed loop is composed of two conductors of different materials. When there is a temperature gradient at both ends, there will be current passing through the loop, and at this time, there is an electromotive force between the two ends, that is, the Seebeck effect. Secondly, the main component of a thermistor sensor is a thermistor. When there is thermal radiation around the thermosensitive material, it will absorb the radiant heat, cause the temperature to rise, and cause the resistance value of the material to change. Secondly, resistance temperature detectors usually use platinum, copper, or nickel, which have a large temperature coefficient, respond quickly to temperature changes, can resist thermal fatigue, and are easy to process into precision coils. In addition, an IC temperature sensor is made by using a silicon semiconductor integration process. It is a dedicated IC that integrates a temperature sensor on a chip and can complete temperature measurement and analog signal output functions. The main characteristics of an analog integrated temperature sensor are single function, small temperature measurement error, low price, fast response speed, long transmission distance, small volume, low power consumption, etc. It is suitable for long-distance temperature measurement and detection, does not require non-linear calibration, and has a simple peripheral circuit.

[0087] In one embodiment, the outdoor unit 200 of the embodiment of the present application further includes, but is not limited to, a second economizer 240. Among them, the second economizer 240 is provided with a second main passage 241, a second auxiliary passage 242, and a second throttling device EEVC2. One end of the second main passage 241 is communicated with the first main passage 231, and the other end is communicated with a plurality of indoor units 400 through a switching device 300, and is also communicated with the suction port and the gas replenishing port of the compressor 210 through the second auxiliary passage 242. In addition, the second throttling device EEVC2 is installed at one end where the second auxiliary passage 242 is communicated with the second main passage 241.

[0088] It should be noted that for the second economizer 240 in the embodiment of the present application, the refrigerant flow rate of the second auxiliary passage 242 can be adjusted through the second throttling device EEVC2, so as to adjust the heat exchange degree between the second auxiliary passage 242 and the second main passage 241, and further adjust the temperature difference between the inlet and outlet of the second main passage 241, thereby improving the low-temperature heating capacity of the air-conditioning system.

[0089] In addition, it should be noted that in the heating mode or the heating and cooling hybrid mode, first, the refrigerant discharged from the exhaust port of the compressor 210 flows through the switching device 300 and the indoor unit 400 for heat exchange. Then, a part of the refrigerant after heat exchange flows into the second main passage 241 of the second economizer 240, and another part of the refrigerant flows through the second auxiliary passage 242 of the second economizer 240 and flows into the suction port and the gas injection port of the compressor 210. Next, the refrigerant passing through the second main passage 241 flows into the first main passage 231 of the first economizer 230. Then, a part of the refrigerant passing through the first main passage 231 flows through the outdoor heat exchanger 220 for heat exchange and flows into the suction port of the compressor 210, while another part of the refrigerant flows through the first auxiliary passage 232 and flows into the suction port of the compressor 210.

[0090] In addition, it should be noted that in the cooling mode, first, the refrigerant discharged from the exhaust port of the compressor 210 flows through the outdoor heat exchanger 220 for heat exchange. Then, the refrigerant after heat exchange continues to flow into the first main passage 231 of the first economizer 230. Next, the refrigerant passing through the first main passage 231 flows through the second main passage 241 of the second economizer 240. Then, the refrigerant passing through the second main passage 241 flows through the switching device 300 and the indoor unit 400 for heat exchange. Finally, the refrigerant after heat exchange flows into the suction port of the compressor 210.

[0091] It should be noted that for the above-mentioned second economizer 240, the second main passage 241 and the second auxiliary passage 242 are close to each other and isolated at the same time. Since the refrigerant becomes a low-temperature and low-pressure refrigerant after passing through the second throttling device EEVC2, the refrigerant flowing through the second auxiliary passage 242 is a low-temperature and low-pressure refrigerant, so that it can exchange heat with the refrigerant in the second main passage 241, thereby cooling the refrigerant in the second main passage 241.

[0092] It can be understood that for the above-mentioned second economizer 240, it can be a plate heat exchanger, a shell-and-tube heat exchanger, a flash evaporator, or other structural forms. The embodiments of the present application do not specifically limit the structural form of the second economizer 240.

[0093] In addition, it can be understood that for the above-mentioned second throttling device EEVC2, it can be an electronic expansion valve, and its structure can be composed of three parts: detection, control, and execution. Its advantages are a large flow regulation range, high control accuracy, suitable for intelligent control, and can adapt to the rapid change of the refrigerant flow rate with high efficiency. In other words, the electronic expansion valve can be considered as an intelligent capillary tube with a variable inner diameter.

[0094] In one embodiment, the outdoor unit 200 of the embodiments of the present application is further provided with a first branch channel 251 and a second branch channel 252. The second auxiliary channel 242 is connected to the suction port of the compressor 210 through the first branch channel 251, and the second auxiliary channel 242 is connected to the gas supplement port of the compressor 210 through the second branch channel 252. Wherein, flow regulating valves are installed in both the first branch channel 251 and the second branch channel 252, such as Figure 2 SV1 and SV2 in

[0095] Specifically, a part of the refrigerant flowing through the second auxiliary channel 242 can flow into the suction port of the compressor 210 through the first branch channel 251, and another part of the refrigerant can flow into the gas supplement port of the compressor 210 through the second branch channel 252. In addition, the embodiments of the present application can also turn on or off the flow regulating valves SV1 and SV2 according to the heat exchange capacity of the current system.

[0096] In one embodiment, the outdoor unit 200 of the embodiments of the present application further includes, but is not limited to, an oil separator 260 and a gas-liquid separator 270. The inlet of the oil separator 260 is connected to the exhaust port of the compressor 210. One outlet of the oil separator 260 is connected to the switching device 300, the outdoor heat exchanger 220 and the gas-liquid separator 270, and the other outlet is connected to the gas-liquid separator 270. In addition, one end of the gas-liquid separator 270 is connected to the oil separator 260, the outdoor heat exchanger 220 and the switching device 300, and the other end is connected to the suction port of the compressor 210.

[0097] It can be understood that regarding the above-mentioned oil separator 260, it can filter the refrigeration oil in the exhaust gas of the compressor 210.

[0098] In addition, it can be understood that regarding the above-mentioned gas-liquid separator 270, it can be a separation device that uses the principles of centrifugal separation and wire mesh filtration to achieve liquid removal, and can be composed of main components such as a cylinder body, a cyclone separator, a high-efficiency foam-breaking net, and a drain valve.

[0099] In one embodiment, the outdoor unit 200 of the embodiments of the present application further includes, but is not limited to, a four-way valve 280. The four-way valve 280 is respectively connected to the outdoor heat exchanger 220, the oil separator 260 and the gas-liquid separator 270.

[0100] In one embodiment, the outdoor unit 200 of the embodiments of the present application further includes, but is not limited to, a controller, and the controller can include, for example Figure 1The processor 110 and the memory 120 shown in the figure. The controller can be communicatively connected to the compressor 210, the first temperature sensor T1, the second temperature sensor T2, the third temperature sensor T3, the fourth temperature sensor T4, the fifth temperature sensor, the first throttling device EEVC1, and the second throttling device EEVC2, so that the controller can adjust the operating frequency of the compressor 210, obtain the refrigerant temperature detected by the first temperature sensor T1, obtain the refrigerant temperature detected by the second temperature sensor T2, obtain the refrigerant temperature detected by the third temperature sensor T3, obtain the refrigerant temperature detected by the fourth temperature sensor T4, obtain the outdoor ambient temperature detected by the fifth temperature sensor, adjust the valve size of the first throttling device EEVC1, and adjust the valve size of the second throttling device EEVC2.

[0101] Those skilled in the art can understand that the described structure does not limit the outdoor unit 200, and it may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0102] Based on the hardware structure of the outdoor unit 200 in the above embodiments, various embodiments of the air conditioning system of the present application are proposed.

[0103] As Figure 3 shown, the air conditioning system of the embodiments of the present application includes, but is not limited to, a switching device 300, a plurality of indoor units 400, and the outdoor unit 200 of any of the above embodiments. Among them, the switching device 300 is disposed between the outdoor unit 200 and the plurality of indoor units 400.

[0104] It should be noted that since the air conditioning system of the embodiments of the present application includes the outdoor unit 200 of any of the above embodiments, therefore, the specific implementation manners and technical effects of the air conditioning system of the embodiments of the present application can refer to the specific implementation manners and technical effects of the outdoor unit 200 of any of the above embodiments.

[0105] It should be noted that in the case of the pure heating mode or the main heating mode, first, the refrigerant discharged from the exhaust port of the compressor 210 will flow through the switching device 300 and the indoor unit 400 for heat exchange. Then, the heat-exchanged refrigerant will continue to flow into the first main path 231 of the first economizer 230 of the outdoor unit 200. Next, a part of the refrigerant passing through the first main path 231 will flow through the outdoor heat exchanger 220 for heat exchange and flow into the suction port of the compressor 210, while the other part of the refrigerant will flow through the first auxiliary path 232 and flow into the suction port of the compressor 210. Among them, in the main heating mode, the ratio of the number of indoor units in the heating mode to the number of indoor units in the cooling mode is greater than a preset value.

[0106] It should be noted that regarding the above-mentioned pure heating mode, it means that the modes of all indoor units currently in operation are heating modes; and regarding the above-mentioned main heating mode, it means that the modes of most indoor units currently in operation are heating modes. For example, in the embodiments of the present application, the ratio of the number of indoor units in the heating mode to the number of indoor units in the cooling mode can be calculated. If this ratio is higher than a preset value, it can be considered that the current operating mode is the main heating mode.

[0107] In addition, it should be noted that in the cooling mode, first, the refrigerant discharged from the exhaust port of the compressor 210 will flow through the outdoor heat exchanger 220 for heat exchange. Then, the heat-exchanged refrigerant will continue to flow into the first main path channel 231 of the first economizer 230. Next, the refrigerant passing through the first main path channel 231 will flow through the switching device 300 and the indoor unit 400 for heat exchange. Finally, the heat-exchanged refrigerant will flow into the suction port of the compressor 210.

[0108] It is worth noting that the switching device 300 in the embodiments of the present application includes a plate heat exchanger 310. In the cooling and heating mixed mode, multiple indoor units 400 include a first indoor unit 400 in the heating mode and a second indoor unit 400 in the cooling mode; the refrigerant discharged from the exhaust port of the compressor 210 enters the first indoor unit 400 after flowing through the switching device 300. A part of the refrigerant flowing out of the first indoor unit 400 enters the first main path channel 231 after flowing through the switching device 300, and another part of the refrigerant flows through the plate heat exchanger 310 and the second indoor unit 400 and then flows into the suction port of the compressor 210.

[0109] Specifically, the switching device 300 is an MS device, and the switching device 300 is used to control multiple indoor units 400 to execute the cooling mode, the heating mode, or the cooling and heating mixed mode. In order to achieve the function of partial cooling and partial heating of different indoor units 400 in the air conditioning system, a switching device 300 is added between the indoor unit 400 and the outdoor unit 200, and the refrigerant is converted by the switching device 300 to different indoor units 400. In the cooling and heating mixed mode, the switching device 300 sets subcooling control to solve the refrigerant flow noise, that is, a part of the high-pressure gas-liquid two-phase refrigerant sent by the outdoor unit 200 is throttled and then heat-exchanged with the main path refrigerant through the plate heat exchanger 310, so that the refrigerant entering the indoor unit 400 is cooled into a liquid refrigerant as much as possible, and then enters each indoor unit 400 for evaporation and refrigeration.

[0110] Based on the above system architecture platform 100, the hardware structures of the outdoor unit and the air conditioning system, various embodiments of the control method of the air conditioning system of the present application are proposed.

[0111] As Figure 4 shown, Figure 4It is a flowchart of a control method for an air conditioning system provided by an embodiment of the present application. This control method can be applied to the above-mentioned air conditioning system and may include, but is not limited to, steps S100, S200, S300, and S400.

[0112] Step S100: In the case of the main heating mode or the pure heating mode;

[0113] Step S200: Obtain the outdoor ambient temperature and the current temperature difference between the inlet and the outlet of the first main path channel;

[0114] Step S300: Determine the target temperature difference between the inlet and the outlet of the first main path channel according to the outdoor ambient temperature;

[0115] Step S400: Adjust the opening degree of the first throttling device according to the current temperature difference and the target temperature difference.

[0116] In an embodiment, if the current working mode of the air conditioning system is the main heating mode or the pure heating mode, then at this time, the opening degree of the first throttling device can be adjusted to improve the low-temperature heating capacity of the air conditioning system. Specifically, in the main heating mode or the pure heating mode, first, the embodiment of the present application can detect the inlet refrigerant temperature at the inlet of the first main path channel through the first temperature sensor, and at the same time detect the outlet refrigerant temperature at the outlet of the first main path channel through the second temperature sensor, and also detect the outdoor ambient temperature through the fifth temperature sensor; then, the embodiment of the present application can perform a difference calculation on the inlet refrigerant temperature and the outlet refrigerant temperature to obtain the current temperature difference between the inlet and the outlet of the first main path channel; at the same time, the embodiment of the present application can also determine the corresponding target temperature difference according to the outdoor ambient temperature, where the target temperature difference can be preset and can change accordingly according to the magnitude of the outdoor ambient temperature; finally, the embodiment of the present application will compare the current temperature difference with the target temperature difference and adjust the opening degree of the first throttling device according to the comparison result. Among them, if the current temperature difference is less than the target temperature difference, it indicates that the current temperature difference does not meet the requirements, then the embodiment of the present application will increase the opening degree of the first throttling device to enhance the heat exchange effect between the first auxiliary path channel and the first main path channel; if the current temperature difference is greater than or equal to the target temperature difference, it indicates that the current temperature difference has met the requirements, then the embodiment of the present application will appropriately reduce the opening degree of the first throttling device to reduce the heat exchange effect between the first auxiliary path channel and the first main path channel.

[0117] It should be noted that regarding the above-mentioned pure heating mode, it means that the modes of all indoor units currently in operation are heating modes; and regarding the above-mentioned main heating mode, it means that the modes of most indoor units currently in operation are heating modes. For example, in the embodiments of the present application, the ratio of the number of indoor units in the heating mode to the number of indoor units in the cooling mode can be calculated. If this ratio is higher than a preset value, the current working mode can be considered the main heating mode.

[0118] It is worth noting that the lower the outdoor ambient temperature, the greater the target temperature difference between the inlet and outlet of the first main path; on the contrary, the higher the outdoor ambient temperature, the smaller the target temperature difference between the inlet and outlet of the first main path.

[0119] In addition, it is worth noting that when the outdoor ambient temperature is low and the current temperature difference is less than the target temperature difference, the adjustment step of the first throttling device will be larger; on the contrary, when the outdoor ambient temperature is high and the current temperature difference is less than the target temperature difference, the adjustment step of the first throttling device will be smaller.

[0120] Since in the embodiments of the present application, a first economizer is added to the outdoor unit, and the first economizer is provided with a first throttling device, it is possible to adjust the refrigerant flow rate of the first auxiliary path through the first throttling device, thereby adjusting the heat exchange degree between the first auxiliary path and the first main path, and further adjusting and achieving the current temperature difference between the inlet and outlet of the first main path to the target temperature difference corresponding to the current outdoor ambient temperature, so as to improve the low-temperature heating capacity of the air-conditioning system; secondly, the modifications and cost impacts in the embodiments of the present application are small, the conversion operability is strong, and the development cycle is short, and it can be quickly deployed in the market; in addition, the indoor units in the embodiments of the present application do not need to be customized to add the electric auxiliary heating function, which can reduce the production cost of the air-conditioning system, improve the safety and reliability, and also reduce the heating cost of users.

[0121] In addition, as Figure 5 shown, Figure 5 is a flowchart of a control method for an air-conditioning system provided by another embodiment of the present application. During the period of adjusting the opening degree of the first throttling device, the control method in the embodiments of the present application may further include but is not limited to step S510 and step S520.

[0122] Step S510: Obtain the current exhaust superheat degree of the compressor;

[0123] Step S520: Adjust the opening degree of the first throttling device according to the current exhaust superheat degree and the preset superheat degree.

[0124] In one embodiment, during the period of adjusting the opening degree of the first throttling device, the embodiments of the present application may also adjust the opening degree of the first throttling device according to the current exhaust superheat degree of the compressor and the preset superheat degree.

[0125] It should be noted that, regarding the adjustment of the opening degree of the first throttling device according to the current exhaust superheat degree and the preset superheat degree in the above step S520, it may include but is not limited to Figure 6 or Figure 7 the following two implementation cases, specifically as follows:

[0126] As Figure 6 shown, Figure 6 is a flowchart of a control method for an air-conditioning system provided by another embodiment of the present application. Regarding the above step S520, it may include but is not limited to step S600.

[0127] Step S600: When the current exhaust superheat degree is less than the first preset superheat degree, control the first throttling device to close, where the first preset superheat degree is the minimum exhaust superheat degree set by the compressor.

[0128] As Figure 7 shown, Figure 7 is a flowchart of a control method for an air-conditioning system provided by another embodiment of the present application. Regarding the above step S520, it may include but is not limited to step S700.

[0129] Step S700: When the current exhaust superheat degree is greater than the second preset superheat degree, control the first throttling device to open, where the second preset superheat degree is greater than or equal to the first preset superheat degree.

[0130] In one embodiment, if the current exhaust superheat degree of the compressor is less than the set minimum exhaust superheat degree, then the embodiment of the present application will respond to close the first throttling device; if the current exhaust superheat degree of the compressor is greater than the set second preset superheat degree, then the embodiment of the present application will respond to open the first throttling device.

[0131] It should be noted that regarding the magnitude relationship between the minimum exhaust superheat degree and the second preset superheat degree, the second preset superheat degree may be greater than or equal to the minimum exhaust superheat degree.

[0132] In addition, it should be noted that in order to avoid the situation where the first throttling device may continuously open and close, the second preset superheat degree in the embodiment of the present application may be greater than the minimum exhaust superheat degree, and the difference between the two should be greater than a certain amplitude, so as to reduce the problem of continuous fluctuating adjustment of the first throttling device.

[0133] In addition, as Figure 8 shown, Figure 8 is a flowchart of a control method for an air-conditioning system provided by another embodiment of the present application. During the adjustment of the opening degree of the first throttling device, the control method of the embodiment of the present application may further include but is not limited to step S800.

[0134] Step S800: When a defrost signal or an oil return signal is received, control the first throttling device to close.

[0135] In one embodiment, during the period of adjusting the opening degree of the first throttling device, if the embodiment of the present application receives a defrost signal or an oil return signal, then the embodiment of the present application will respond to close the first throttling device.

[0136] In addition, as Figure 9 shown, Figure 9 FIG. is a flowchart of a control method for an air conditioning system provided by another embodiment of the present application. During the period of adjusting the opening degree of the first throttling device, the control method of the embodiment of the present application may further include, but is not limited to, step S900.

[0137] Step S900: When a fault signal is received, control the first throttling device and the second throttling device to close, where the fault signal includes at least one of the following: a fault shutdown signal, a temperature-reached shutdown signal, an inlet-end sensor fault signal of the second throttling device, and an outlet-end sensor fault signal of the second throttling device.

[0138] In one embodiment, during the period of adjusting the opening degree of the first throttling device, if the embodiment of the present application receives a fault signal, then the embodiment of the present application will respond to close the first throttling device.

[0139] Based on the control methods for the air conditioning system in the above respective embodiments, specific embodiments of the control method for the air conditioning system of the present application are respectively proposed below.

[0140] As Figure 10 shown, Figure 10 FIG. is an overall flowchart of a control method for an air conditioning system provided by an embodiment of the present application, which may specifically include, but is not limited to, the following steps S1010, step S1020, step S1030, step S1040, step S1050, and step S1060.

[0141] Step S1010: The unit receives a startup signal and starts to operate.

[0142] Step S1020: Determine the operation mode. If the current mode is the main heating or pure heating mode, then execute step three; where the operation mode includes four modes: pure cooling, main cooling, main heating, and pure heating.

[0143] Step S1030: Detect the outdoor ambient temperature T4, which is refreshed once a minute. The first throttling device EEVC1 is controlled according to the temperature range of the outdoor ambient temperature T4 and the temperature difference between the refrigerant temperature T1 at the inlet of the first main path channel and the refrigerant temperature T2 at the outlet, and the adjustment range is 52 to 480P, that is:

[0144] When T4 ≤ -18°C, the target temperature difference (T1 - T2)target between the inlet and outlet of the first main path channel is D.

[0145] When -5 ≤ T4 < -18°C, the target temperature difference (T1 - T2)target between the inlet and outlet of the first main path channel is D - 18.

[0146] When 7 ≤ T4 < -5°C, the target temperature difference (T1 - T2)target between the inlet and outlet of the first main path channel is D - 22.

[0147] When T4 > 7°C, the target temperature difference (T1 - T2)target between the inlet and outlet of the first main path channel is D - 38.

[0148] Among them, the value of D is confirmed according to the system configuration, and the initial opening of EEVC1 is 0.

[0149] Step S1040: EEVC1 judges and adjusts every X seconds, where the range of X is 30 to 60 seconds.

[0150] When T4 ≤ -18°C and T1 - T2 < D, the current opening of EEVC1 + 3N.

[0151] When -5 ≤ T4 < -18°C and T1 - T2 < D - 18, the current opening of EEVC1 + 2N.

[0152] When 7 ≤ T4 < -5°C and T1 - T2 < D - 22, the current opening of EEVC1 + N.

[0153] When T4 > 7°C and T1 - T2 < D - 38, the current opening of EEVC1 - N / 2.

[0154] When T1 - T2 > (T1 - T2) target then EEVC1 - N every 30 seconds until it is less than or equal to (T1 - T2) target - 2.

[0155] Step S1050: 1. During the adjustment of EEVC1, if the current superheat degree T of the compressor DSH < the minimum value required by the compressor continuously for 1 minute, then EEVC1 closes immediately; when it is detected that the current superheat degree T of the compressor DSH > 10°C for 30 seconds continuously, then EEVC1 restarts. 2. When the unit receives the defrosting and oil return signals, EEVC1 closes immediately and can only restart 5 minutes after completion.

[0156] Step S1060: When receiving signals such as defrosting, fault shutdown, temperature - reaching shutdown, and faults of the inlet or outlet sensors of the second throttling device EEVC2, EEVC2 and EEVC1 close and the count is cleared.

[0157] Based on the control methods of the air-conditioning systems according to the above various embodiments, the following will separately present various embodiments of the controller, the air-conditioning system, and the computer-readable storage medium of the present application.

[0158] In addition, an embodiment of the present application provides a controller, which includes: a processor, a memory, and a computer program stored on the memory and executable on the processor.

[0159] The processor and the memory can be connected through a bus or other means.

[0160] It should be noted that the controller in this embodiment may include the processor and the memory in the embodiment shown in Figure 1 As shown, the two belong to the same inventive concept, so they have the same implementation principle and beneficial effects, which will not be elaborated here.

[0161] The non-transitory software program and instructions required to implement the control method of the air-conditioning system of the above embodiment are stored in the memory, and when executed by the processor, they execute the control method of the air-conditioning system of the above embodiment.

[0162] According to the technical solution of the controller of the embodiment of the present application, since a first economizer is added to the outdoor unit in the embodiment of the present application, and the first economizer is provided with a first throttling device, the refrigerant flow rate of the first auxiliary passage can be adjusted through the first throttling device, so as to adjust the heat exchange degree between the first auxiliary passage and the first main passage, and further adjust and reach the target temperature difference corresponding to the current outdoor ambient temperature for the current temperature difference between the inlet and outlet of the first main passage, thereby improving the low-temperature heating capacity of the air-conditioning system; secondly, the modification and cost impact of the embodiment of the present application are small, the conversion operability is strong, and the development cycle is short, so it can be quickly deployed in the market; in addition, the indoor unit of the embodiment of the present application does not need to be customized to add an electric auxiliary heating function, which can reduce the production cost of the air-conditioning system, improve safety and reliability, and also reduce the heating cost of users.

[0163] It should be noted that since the controller of the embodiment of the present application can execute the control method of the air-conditioning system of any of the above embodiments, the specific implementation manners and technical effects of the controller of the embodiment of the present application can refer to the specific implementation manners and technical effects of the control method of the air-conditioning system of any of the above embodiments.

[0164] In addition, an embodiment of the present application further provides an air-conditioning system, which includes the controller of any of the above embodiments.

[0165] According to the technical solution of the air conditioning system according to the embodiments of the present application, since a first economizer is added to the outdoor unit in the embodiments of the present application, and the first economizer is provided with a first throttling device, the refrigerant flow rate of the first auxiliary passage can be adjusted through the first throttling device, thereby adjusting the heat exchange degree between the first auxiliary passage and the first main passage, and further adjusting and reaching the target temperature difference corresponding to the current outdoor ambient temperature for the current temperature difference between the inlet and outlet of the first main passage, so as to improve the low-temperature heating capacity of the air conditioning system; secondly, the modification and cost impact of the embodiments of the present application are small, the conversion operability is strong, the development cycle is short, and it can be quickly deployed in the market; in addition, the indoor unit of the embodiments of the present application does not need to be customized to add an electric auxiliary heating function, so as to reduce the production cost of the air conditioning system, improve safety and reliability, and also reduce the heating cost of users.

[0166] It should be noted that since the air conditioning system according to the embodiments of the present application includes the controller of any of the above embodiments, and the controller of any of the above embodiments can execute the control method of the air conditioning system of any of the above embodiments, therefore, the specific implementation manners and technical effects of the air conditioning system according to the embodiments of the present application can refer to the specific implementation manners and technical effects of the control method of the air conditioning system of any of the above embodiments.

[0167] In addition, an embodiment of the present application also provides a computer-readable storage medium, which stores computer-executable instructions for executing the control method of the above air conditioning system. Exemplarily, execute the Figures 4 to 10 method steps described above.

[0168] According to the technical solution of the computer-readable storage medium according to the embodiments of the present application, since a first economizer is added to the outdoor unit in the embodiments of the present application, and the first economizer is provided with a first throttling device, the refrigerant flow rate of the first auxiliary passage can be adjusted through the first throttling device, thereby adjusting the heat exchange degree between the first auxiliary passage and the first main passage, and further adjusting and reaching the target temperature difference corresponding to the current outdoor ambient temperature for the current temperature difference between the inlet and outlet of the first main passage, so as to improve the low-temperature heating capacity of the air conditioning system; secondly, the modification and cost impact of the embodiments of the present application are small, the conversion operability is strong, the development cycle is short, and it can be quickly deployed in the market; in addition, the indoor unit of the embodiments of the present application does not need to be customized to add an electric auxiliary heating function, so as to reduce the production cost of the air conditioning system, improve safety and reliability, and also reduce the heating cost of users.

[0169] It should be noted that since the computer-readable storage medium of the embodiments of the present application can execute the control method of the air-conditioning system in any of the above embodiments, therefore, for the specific implementation manners and technical effects of the computer-readable storage medium of the embodiments of the present application, reference may be made to the specific implementation manners and technical effects of the control method of the air-conditioning system in any of the above embodiments.

[0170] Those of ordinary skill in the art can understand that all or some of the steps and systems disclosed in the above methods can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or can be implemented as hardware, or can be implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0171] The above has specifically described the preferred embodiments of the present application, but the present application is not limited to the above implementation manners. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. An outdoor unit, characterized in that, it includes: an outdoor heat exchanger; a compressor, the exhaust port of the compressor is used to communicate with the outdoor heat exchanger or communicate with a plurality of indoor units through a switching device, wherein the switching device is used to control the plurality of indoor units to execute a refrigeration mode, a heating mode or a refrigeration and heating hybrid mode; a first economizer, provided with a first main passage, a first auxiliary passage and a first throttling device, one end of the first main passage is used to communicate with a plurality of indoor units through the switching device, and the other end is respectively communicated with the compressor through the outdoor heat exchanger and the first auxiliary passage, and the first throttling device is installed at one end where the first auxiliary passage communicates with the first main passage; wherein, the outdoor unit further includes a second economizer, the second economizer is provided with a second main passage, a second auxiliary passage and a second throttling device, one end of the second main passage communicates with the first main passage, and the other end is used to communicate with a plurality of indoor units through the switching device, and is also communicated with the suction port and the gas replenishing port of the compressor through the second auxiliary passage, and the second throttling device is installed at one end where the second auxiliary passage communicates with the second main passage; the outdoor unit is further provided with a first branch passage and a second branch passage, the second auxiliary passage communicates with the suction port of the compressor through the first branch passage, and the second auxiliary passage communicates with the gas replenishing port of the compressor through the second branch passage, wherein flow regulating valves are installed in both the first branch passage and the second branch passage; in addition, the outdoor unit further includes an oil separator and a gas-liquid separator, the inlet of the oil separator communicates with the exhaust port of the compressor, one outlet communicates with the switching device, the outdoor heat exchanger and the gas-liquid separator, and the other outlet communicates with the gas-liquid separator, one end of the gas-liquid separator communicates with the oil separator, the outdoor heat exchanger and the switching device, and the other end communicates with the suction port of the compressor.

2. The outdoor unit according to claim 1, characterized in that, the first economizer is further provided with a first temperature sensor and a second temperature sensor, the first temperature sensor is installed at one end where the first main passage communicates with the switching device, and the second temperature sensor is installed at one end where the first main passage communicates with the outdoor heat exchanger.

3. The outdoor unit according to claim 1, characterized in that, the first economizer is further provided with a third temperature sensor and a fourth temperature sensor, the third temperature sensor is installed at one end where the first auxiliary passage communicates with the first main passage, and the fourth temperature sensor is installed at one end where the first auxiliary passage communicates with the compressor.

4. The outdoor unit according to claim 1, characterized in that, the outdoor unit is further provided with a fifth temperature sensor, and the fifth temperature sensor is used to detect the outdoor ambient temperature.

5. An air conditioning system, characterized in that, Comprising a switching device, a plurality of indoor units, and an outdoor unit as described in any one of claims 1 to 4, wherein the switching device is disposed between the outdoor unit and the plurality of indoor units.

6. The air conditioning system according to claim 5, characterized in that in the pure heating mode or the main heating mode, the refrigerant discharged from the exhaust port of the compressor flows through the switching device and the indoor units and then enters the first main path channel. A part of the refrigerant flowing out of the first main path channel flows through the outdoor heat exchanger and then enters the suction port of the compressor, and another part of the refrigerant flows through the first auxiliary path channel and then enters the suction port of the compressor. Wherein, in the main heating mode, the ratio of the number of indoor units in the heating mode to the number of indoor units in the cooling mode is greater than a preset value.

7. The air conditioning system according to claim 6, characterized in that the switching device includes a plate heat exchanger. In the cooling and heating mixed mode, the plurality of indoor units include a first indoor unit in the heating mode and a second indoor unit in the cooling mode; the refrigerant discharged from the exhaust port of the compressor flows through the switching device and then enters the first indoor unit. A part of the refrigerant flowing out of the first indoor unit flows through the switching device and then enters the first main path channel, and another part of the refrigerant flows through the plate heat exchanger and the second indoor unit and then flows into the suction port of the compressor.

8. The air conditioning system according to claim 5, characterized in that in the cooling mode, the refrigerant discharged from the exhaust port of the compressor flows through the outdoor heat exchanger and then enters the first main path channel. The refrigerant flowing out of the first main path channel flows through the switching device and the indoor units and then enters the suction port of the compressor.

9. A control method for an air conditioning system, characterized in that applied to the air conditioning system as described in any one of claims 5 to 8, the control method includes: in the case of the main heating mode or the pure heating mode, obtaining the outdoor ambient temperature and the current temperature difference between the inlet and the outlet of the first main path channel. Wherein, in the main heating mode, the ratio of the number of indoor units in the heating mode to the number of indoor units in the cooling mode is greater than a preset value; determining the target temperature difference between the inlet and the outlet of the first main path channel according to the outdoor ambient temperature; adjusting the opening degree of the first throttling device according to the current temperature difference and the target temperature difference.

10. The control method according to claim 9, characterized in that further includes: obtaining the current exhaust superheat degree of the compressor; adjusting the opening degree of the first throttling device according to the current exhaust superheat degree and the preset superheat degree.

11. The control method according to claim 10, characterized in that the adjusting the opening degree of the first throttling device according to the current exhaust superheat degree and the preset superheat degree includes at least one of the following: when the current exhaust superheat degree is less than the first preset superheat degree, controlling the first throttling device to close; When the current exhaust superheat degree is greater than a second preset superheat degree, control the first throttling device to open, wherein the second preset superheat degree is greater than or equal to the first preset superheat degree.

12. The control method according to claim 9, characterized in that it further includes: When receiving a defrost signal or an oil return signal, control the first throttling device to close.

13. The control method according to claim 9, characterized in that the air conditioning system further includes a second economizer, the second economizer is provided with a second main passage, a second auxiliary passage and a second throttling device, one end of the second main passage communicates with the first main passage, and the other end communicates with a plurality of the indoor units through the switching device, and also communicates with the suction port and the gas replenishing port of the compressor through the second auxiliary passage, the second throttling device is installed at one end where the second auxiliary passage communicates with the second main passage; the control method further includes: When receiving a fault signal, control the first throttling device and the second throttling device to close, wherein the fault signal includes at least one of the following: a fault shutdown signal, a temperature - reaching shutdown signal, an inlet - end sensor fault signal of the second throttling device, an outlet - end sensor fault signal of the second throttling device.

14. An air conditioning system, characterized in that it includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, when the processor runs the computer program, it executes the control method of the air conditioning system according to any one of claims 9 to 13.

15. A computer - readable storage medium, characterized in that: it stores computer - executable instructions, and the computer - executable instructions are used to execute the control method of the air conditioning system according to any one of claims 9 to 13.

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