Air conditioning equipment

Abstract

The present invention discloses an air conditioning device, including an outdoor unit with a compressor disposed therein: an outdoor return air temperature sensor is provided at its return air inlet to generate an outdoor ambient temperature, and an outdoor supply air temperature sensor is provided at its supply air outlet to generate an outdoor supply air temperature; the outdoor ambient temperature can be used to calculate the compressor operating frequency or determine the start / stop time of the compressor; a reflux judgment unit configured to detect whether a set reflux condition is satisfied during operation to determine whether there is a situation where the supply air of the outdoor unit flows back to the return air inlet; an operation control unit configured to, when there is a situation where the supply air of the outdoor unit flows back to the return air inlet, control not to operate according to the compressor operating frequency calculated based on the outdoor ambient temperature or the determined start / stop time of the compressor, but to operate by itself according to the emergency compressor operating frequency calculated based on the corrected outdoor supply air temperature or the determined emergency compressor start / stop time; the present invention provides a compensation emergency control method to improve the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and particularly to an air conditioning device. Background Art

[0002] The control objectives that the automatic control system of an air conditioning device should achieve include: ensuring the safe and efficient operation of the refrigeration cycle, that is, under any circumstances, including different climate conditions, different operating modes, mode switching, normal operation and misoperation, etc., the device and the automatic control system are not damaged by hardware, and at the same time, it is necessary to maintain high efficiency to achieve the purpose of energy conservation and environmental protection.

[0003] To achieve the above objectives, a variety of control methods are disclosed in the prior art. For example, to prevent the compressor from running in a high-temperature environment for a long time, causing the coil to burn out or the pipeline to burst, it is usually designed to perform shutdown protection under harsh working conditions such as a high temperature of the outdoor unit (as disclosed in Chinese Patent Application CN115789905A).

[0004] In some models, the return air temperature sampled by the temperature sensor set at the return air outlet of the outdoor unit is used as the ambient temperature of the outdoor unit. However, during the use of the air conditioning device, it may occur that part or all of the air sent by the outdoor unit flows back to the return air outlet; this may be caused by short-term weather phenomena, or it may also be caused by installing equipment such as a housing outside the outdoor unit (for example, to ensure the aesthetic appearance of the entire building facade); during summer cooling, the sampled value of the outdoor ambient temperature by the control system is too high, and it is easy to enter the shutdown protection state; during winter heating, it intensifies the frosting of the outdoor unit and also increases the frequency of defrosting operation; since the defrosting of some models requires controlling the compressor to stop, it will also affect the user experience.

[0005] The above information disclosed in this background art is only used to increase the understanding of the background art of this application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0006] Aiming at the problem that when the temperature sampled value at the return air outlet of the outdoor unit is used as the outdoor ambient temperature, during the use process, the air sent by the outdoor unit may flow back to the return air outlet, resulting in a large deviation of the outdoor ambient temperature and further causing the compressor to stop and affecting the user experience, some embodiments of the present invention design and provide an air conditioning device.

[0007] In some embodiments of the present application, the air conditioning device includes an outdoor unit with a compressor disposed therein. An outdoor return air temperature sensor is provided at the return air outlet thereof to generate an outdoor ambient temperature, and an outdoor supply air temperature sensor is provided at the supply air outlet to generate an outdoor supply air temperature.

[0008] In some embodiments of the present application, the outdoor ambient temperature can be used to calculate the compressor operating frequency or determine the start / stop time of the compressor.

[0009] In some embodiments of the present application, the air conditioning device includes a return air judgment unit and an operation control unit; wherein the return air judgment unit is configured to detect whether the set return air condition is satisfied during operation to determine whether there is a situation where the air sent by the outdoor unit returns to the return air inlet; the operation control unit is configured to, when there is a situation where the air sent by the outdoor unit returns to the return air inlet, control not to operate according to the compressor operating frequency calculated based on the outdoor ambient temperature or the determined start / stop time of the compressor, but to operate by itself according to the emergency compressor operating frequency calculated based on the corrected outdoor air supply temperature or the determined emergency start / stop time of the compressor.

[0010] In some embodiments of the present application, the air conditioning device includes an indoor unit, and an indoor return air temperature sensor is provided at the air inlet of the indoor unit.

[0011] In some embodiments of the present application, during the startup phase, the return air judgment unit is configured to: compare the detected value of the outdoor return air temperature sensor with the detected value of the outdoor air supply temperature sensor; at two or more different times, calculate the outdoor temperature difference between the detected value of the outdoor return air temperature sensor and the detected value of the outdoor air supply temperature sensor; calculate the change in the outdoor temperature difference based on the outdoor temperature differences calculated at different times; obtain the detected values of the indoor return air temperature sensor at two or more different times, and calculate the change in the indoor return air temperature based on the detected values of the indoor return air temperature sensor obtained at different times.

[0012] In some embodiments of the present application, the return air judgment unit is configured to presume that the set return air condition is satisfied when the following conditions are simultaneously met: the detected value of the outdoor return air temperature sensor is different from the detected value of the outdoor air supply temperature sensor, the change in the outdoor temperature difference is below the set outdoor temperature difference fluctuation threshold, and the change in the indoor return air temperature is below the set indoor return air temperature fluctuation threshold.

[0013] In some embodiments of the present application, the air conditioning device further includes a calculation unit; the calculation unit is configured to calculate the set temperature difference between the target indoor environment temperature set by the user and the detected value of the indoor return air temperature sensor, and calculate the compressor operating frequency based on the product of the set temperature difference, the outdoor ambient temperature, and the proportionality coefficient.

[0014] In some embodiments of the present application, the operation control unit is configured to, when the air supply of the outdoor unit flows back to the return air, control not to calculate the compressor operation frequency based on the product of the set temperature difference, the outdoor ambient temperature, and the proportionality coefficient, but to operate according to the emergency compressor operation frequency calculated based on the corrected outdoor air supply temperature by itself.

[0015] In some embodiments of the present application, the air conditioning device further includes a storage unit; the storage unit is configured to store historical operation data, and the historical operation data at least includes a linear model between the outdoor ambient temperature and the outdoor air supply temperature obtained through linear regression analysis when the air supply of the outdoor unit does not flow back to the return air outlet, where the outdoor ambient temperature is used as the output and the outdoor air supply temperature is used as the input.

[0016] In some embodiments of the present application, the air conditioning device further includes a correction unit; the correction unit is configured to use the product of the slope of the linear model and the outdoor air supply temperature when the air supply of the outdoor unit flows back to the return air outlet as the corrected outdoor air supply temperature.

[0017] In some embodiments of the present application, the operation control unit is configured to, when the air supply of the outdoor unit flows back to the return air, control not to calculate the compressor operation frequency based on the product of the set temperature difference, the outdoor ambient temperature, and the proportionality coefficient, but to calculate the emergency compressor operation frequency based on the product of the set temperature difference, the corrected outdoor air supply temperature, and the proportionality coefficient by itself.

[0018] In some embodiments of the present application, the air conditioning device further includes a determination unit; the determination unit is configured to determine the start and stop times of the compressor based on the magnitude relationship between the detected value of the indoor return air temperature sensor and the tolerance range; at least one boundary value of the tolerance range is the product of the corrected set temperature, the correction coefficient, and the outdoor ambient temperature.

[0019] In some embodiments of the present application, the operation control unit is configured to, when the air supply of the outdoor unit flows back to the return air, control not to operate according to the start and stop times of the compressor determined by the determination unit, but to operate according to the emergency start and stop times of the compressor determined based on the corrected outdoor air supply temperature by itself.

[0020] In some embodiments of the present application, the operation control unit is configured to, when the air supply of the outdoor unit flows back to the return air, determine the emergency start and stop times of the compressor based on the magnitude relationship between the detected value of the indoor return air temperature sensor and the corrected tolerance range; at least one boundary value of the corrected tolerance range is the product of the corrected set temperature, the correction coefficient, and the corrected outdoor air supply temperature.

[0021] In some embodiments of the present application, in the cooling mode, the determining unit is configured to: when the detected value based on the indoor return air temperature sensor is higher than the upper boundary value of the tolerance range, determine it as the compressor starting moment; when the detected value based on the indoor return air temperature sensor is lower than the lower boundary value of the tolerance range, determine it as the compressor stopping moment; when the detected value based on the indoor return air temperature sensor is between the upper boundary value and the lower boundary value of the tolerance range, keep the compressor maintaining the current state.

[0022] In some embodiments of the present application, in the heating mode, the determining unit is configured to: when the detected value based on the indoor return air temperature sensor is higher than the upper boundary value of the tolerance range, determine it as the compressor stopping moment; when the detected value based on the indoor return air temperature sensor is higher than the lower boundary value of the tolerance range, determine it as the compressor starting moment; when the detected value based on the indoor return air temperature sensor is between the upper boundary value and the lower boundary value of the tolerance range, keep the compressor maintaining the current state.

[0023] In some embodiments of the present application, the upper boundary value of the tolerance range is the product of the corrected set temperature, the first correction coefficient, and the outdoor ambient temperature; the lower boundary value of the tolerance range is the product of the set temperature, the second correction coefficient, and the outdoor ambient temperature.

[0024] In some embodiments of the present application, in the cooling mode, the operation control unit is configured to: when the detected value based on the indoor return air temperature sensor is higher than the upper boundary value of the corrected tolerance range, determine it as the compressor starting moment; when the detected value based on the indoor return air temperature sensor is lower than the lower boundary value of the corrected tolerance range, determine it as the compressor stopping moment; when the detected value based on the indoor return air temperature sensor is between the upper boundary value and the lower boundary value of the corrected tolerance range, the compressor maintains the current state.

[0025] In some embodiments of the present application, in the heating mode, the operation control unit is configured to: when the detected value based on the indoor return air temperature sensor is higher than the upper boundary value of the corrected tolerance range, determine it as the compressor stopping moment; when the detected value based on the indoor return air temperature sensor is higher than the lower boundary value of the corrected tolerance range, determine it as the compressor starting moment; when the detected value based on the indoor return air temperature sensor is between the upper boundary value and the lower boundary value of the corrected tolerance range, keep the compressor maintaining the current state.

[0026] In some embodiments of the present application, the upper boundary value of the calibration tolerance range is the product of the calibrated set temperature, the first calibration coefficient, and the calibrated outdoor supply air temperature; the lower boundary value of the tolerance range is the product of the set temperature, the second calibration coefficient, and the calibrated outdoor supply air temperature.

[0027] In some embodiments of the present application, an outdoor fan is further provided in the outdoor unit; in the cooling mode, the operation control unit is further configured to, when the supply air of the outdoor unit flows back to the air return opening, automatically increase the rotational speed of the outdoor fan to reduce the internal temperature of the outdoor unit.

[0028] In some embodiments of the present application, the operation control unit is further configured to, when the supply air of the outdoor unit flows back to the air return opening, automatically increase the rotational speed of the outdoor fan to the maximum rotational speed, and after reaching the maximum rotational speed, automatically execute control to reduce the emergency compressor operation frequency calculated based on the calibrated outdoor supply air temperature to reduce the internal temperature of the outdoor unit.

[0029] Compared with the prior art, the advantages and positive effects of the present invention are as follows: when the supply air of the outdoor unit flows back to the air return opening, it can automatically operate in a reasonable and stable emergency mode, while meeting the user's usage requirements, ensuring that the air conditioning equipment is not damaged by irreversible hardware, and improving the stability of the equipment.

[0030] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic diagram of the refrigeration cycle structure of the air conditioning equipment provided by some embodiments of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the air conditioning equipment provided by some embodiments of the present invention;

[0034] Figure 3 It is a schematic block diagram of the structure of the air conditioning equipment provided by some embodiments of the present invention;

[0035] Figure 4 It is a flowchart of the air conditioning equipment provided by some embodiments of the present invention;

[0036] Figure 5 Flow chart of an air conditioning device provided by some embodiments of the present invention;

[0037] Figure 6 Flow chart of an air conditioning device provided by some embodiments of the present invention;

[0038] Figure 7 Schematic block diagram of the structure of an air conditioning device provided by some embodiments of the present invention;

[0039] Figure 8 Schematic block diagram of the structure of an air conditioning device provided by some embodiments of the present invention;

[0040] Figure 9 Schematic block diagram of the structure of an air conditioning device provided by some embodiments of the present invention;

[0041] Figure 10 Schematic block diagram of the structure of an air conditioning device provided by some embodiments of the present invention;

[0042] Figure 11 Flow chart of an air conditioning device provided by some embodiments of the present invention;

[0043] Figure 12 Flow chart of an air conditioning device provided by some embodiments of the present invention;

[0044] Figure 13 Flow chart of an air conditioning device provided by some embodiments of the present invention;

[0045] Figure 14 Flow chart of an air conditioning device provided by some embodiments of the present invention;

[0046] Figure 15 Flow chart of an air conditioning device provided by some embodiments of the present invention;

[0047] Figure 16 Flow chart of an air conditioning device provided by some embodiments of the present invention;

[0048] Figure 17 Flow chart of an air conditioning device provided by some embodiments of the present invention;

[0049] Figure 18 Timing diagram of an air conditioning device provided by some embodiments of the present invention;

[0050] Figure 19 Timing diagram of an air conditioning device provided by some embodiments of the present invention;

[0051] Figure 20The timing diagram of the air conditioning device provided by some embodiments of the present invention;

[0052] Figure 21 The timing diagram of the air conditioning device provided by some embodiments of the present invention. Specific embodiments

[0053] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0054] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are 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, and therefore should not be construed as a limitation to the present application.

[0055] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "plurality" is two or more.

[0056] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0058] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0059] During the use of an air conditioning device, it may occur that part or all of the air sent by the outdoor unit flows back to the air return opening, resulting in a too high sampling value of the outdoor ambient temperature during summer cooling, which easily causes the compressor to enter the shutdown protection state; during winter heating, it aggravates the frosting of the outdoor unit and increases the defrosting operation frequency. As shown in the figure, some embodiments of the present application design and provide an air conditioning device that can perform emergency control by itself when the above situation occurs to meet the actual use needs of users.

[0060] Figure 1 It is a schematic structural diagram of the refrigeration cycle in the air conditioning device 10.

[0061] Figure 1 The shown air conditioning device 10 is a system that performs the refrigeration cycle of the air conditioning device 10 by using a compressor 12, a condenser, a throttling device 18, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0062] From a principle perspective, a low-temperature and low-pressure refrigerant enters the compressor 12, and the compressor 12 compresses the refrigerant into a high-temperature and high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser, and the condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0063] The throttling device 18 expands the high-temperature and high-pressure liquid-phase refrigerant formed by condensation in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the throttling device 18 and returns the refrigerant gas in the low-temperature and low-pressure state to the compressor 12. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to perform a heat exchange with the material to be cooled. During the entire cycle, the air conditioning device 10 can adjust the temperature of the indoor space.

[0064] As Figure 2 shown, the outdoor unit 26 of the air conditioning device 10 refers to the part of the refrigeration cycle including the compressor 12 and the outdoor heat exchanger 14. The indoor unit of the air conditioning device 10 is placed in the air-conditioned room and includes the indoor heat exchanger 20. And the throttling device 18 can be provided in the indoor unit and / or the outdoor unit 26.

[0065] The indoor heat exchanger 20 and the outdoor heat exchanger 14 are used as condensers or evaporators. When the indoor heat exchanger 20 is used as a condenser, the air conditioning device 10 serves as a heater in the heating mode; when the indoor heat exchanger 20 is used as an evaporator, the air conditioning device 10 serves as a cooler in the cooling mode.

[0066] As Figure 1 and Figure 2 shown, in an alternative embodiment, one compressor 12 can be provided in each outdoor unit 26. In another alternative embodiment, multiple compressors 12 (not shown) can be provided in each outdoor unit 26.

[0067] In an alternative embodiment, during the operation of the air conditioning device 10, the rotational speed of the compressor 12 remains unchanged, and the refrigerant flow rate is not adjusted. The temperature of the air-conditioned room is adjusted by starting and stopping the compressor 12.

[0068] Specifically, an outdoor control circuit is provided in the outdoor unit 26. The outdoor control circuit is usually arranged in an electrical box with good sealing performance. The outdoor control circuit includes components such as a processor, a storage unit, an input / output interface, and a communication interface. The processor can be a dedicated processor, a central processing unit (CPU), etc. The processor can access the storage unit to execute instructions or application programs stored in the storage unit to implement related functions. The storage unit can include volatile memory and / or non-volatile memory. The input / output interface can be communicatively connected to various sensors and the compressor 12 provided in the outdoor unit 26 to receive the detection values of the sensors provided in the outdoor unit 26 and output start or stop instructions to the compressor 12. For example, the operation and stop of the compressor 12 are controlled by controlling the suction and disconnection of a relay. Exemplarily, it starts when a high level is output and stops when a low level is output. The communication interface can support different wireless communication protocols, such as WiFi, Bluetooth, near-field communication, NB-IoT, etc., so that the outdoor control circuit can be communicatively connected to other electronic devices. Other electronic devices include, but are not limited to, cloud servers, computers (upper computers), smart phones, tablet computers, PDAs, intelligent control tooling, wearable devices, and vehicle-mounted devices, etc.

[0069] In an alternative embodiment, during the operation of the air conditioning device 10, by controlling the refrigerant circulation amount of the compressor 12 and the refrigerant flow rate entering the indoor heat exchanger 20, the indoor cooling and heating load requirements are timely met. The air conditioning device 10 continuously operates at different speeds according to the magnitude of the indoor load. Correspondingly, at the same time, by controlling the opening degree of the throttling device 18, the refrigerant flow rate is changed at any time, so that the delivery amount of the compressor 12 is adapted to the supply amount through the throttling device 18, the superheat degree is adapted, and the capacity of the evaporator is maximally exerted, thereby achieving the optimal control of the refrigeration system.

[0070] Specifically, a frequency conversion module is further provided in the outdoor control circuit. The frequency conversion module receives the control instruction output by the processor, so that the operating frequency of the compressor 12 continuously changes within a frequency range.

[0071] An outdoor fan 16 and a four-way valve 24 are also provided in the outdoor unit 26. The outdoor fan 16 can be an axial flow fan, a cross-flow fan, or other optional fan forms, and is usually arranged near the outdoor heat exchanger 14. The input / output interface is also communicatively connected to the outdoor fan 16 to control the start / stop and wind speed of the outdoor fan 16 by controlling the suction and disconnection of a relay. For example, when the high wind speed control pin outputs a high level, the outdoor fan 16 operates at high wind speed; when the medium wind speed control pin outputs a high level, the outdoor fan 16 operates at medium wind speed; when the low wind speed control pin outputs a high level, the outdoor fan 16 operates at low wind speed.

[0072] The four-way valve 24 is a valve that switches the refrigerant flow direction according to the operating mode of the air conditioning device 10. That is, in the cooling mode, the discharge side of the compressor 12 is connected to one end of the outdoor heat exchanger 14 through pipelines such as the four-way valve 24, and the suction side of the compressor 12 is connected to one end of the indoor heat exchanger 20 through pipelines such as the four-way valve 24. Thus, the outdoor heat exchanger 14 functions as a condenser, and the indoor heat exchanger 20 functions as an evaporator. Similarly, in the heating mode, the discharge side of the compressor 12 is connected to one end of the indoor heat exchanger 20 through the four-way valve 24 and pipelines, and the suction side of the compressor 12 is connected to one end of the outdoor heat exchanger 14 through pipelines such as the four-way valve 24. Thus, the indoor heat exchanger 20 functions as a condenser, and the outdoor heat exchanger 14 functions as an evaporator.

[0073] In addition, other conventional components such as a gas-liquid separator can be provided. The gas-liquid separator is a shell-shaped component for separating the refrigerant into gas and liquid, and is usually provided on the suction side of the compressor 12.

[0074] The throttling device 18 can be a capillary tube or an electronic expansion valve to reduce the pressure of the refrigerant flowing into it.

[0075] As Figure 2 shown, in this embodiment, multiple temperature sensors are provided in the outdoor unit 26; specifically, an outdoor return air temperature sensor 28 is provided at the return air inlet, and the outdoor return air temperature sensor 28 is used to generate the outdoor ambient temperature; an outdoor supply air temperature sensor 30 is provided at the supply air outlet to generate the supply air temperature. The outdoor control circuit generates the compressor operating frequency based on the input conditions, or determines the start and stop time of the compressor by comparing the input conditions with the set conditions. In this embodiment, the outdoor ambient temperature can be used as a parameter of the input conditions to calculate the compressor operating frequency or determine the start and stop time of the compressor. A compressor discharge temperature sensor, an outdoor heat exchanger pipe temperature sensor, etc. can also be provided in the outdoor unit 26, which will not be listed one by one here.

[0076] In an alternative embodiment, the air conditioning device 10 can include one outdoor unit 26; in other alternative embodiments of the present application, the air conditioning device 10 can include multiple outdoor units, and each outdoor unit can work independently or be configured to work in groups; for example, two outdoor units 26 are in a group, and each outdoor unit or each group of outdoor units is provided with a corresponding indoor unit.

[0077] In an alternative embodiment, the indoor unit may adopt an independent air supply structure, such as a wall-mounted air supply structure, a floor-standing air supply structure, a duct-type air supply structure, or an air supply structure embedded in the ceiling, etc. The air supply structure includes a housing having a return air inlet for sucking in air and a supply air outlet for sending the heat-exchanged air into the air-conditioned room. The indoor fan 22 and the indoor heat exchanger 20 are disposed in the housing, and the indoor fan 22 is disposed near the indoor heat exchanger 20.

[0078] In an alternative embodiment, the indoor unit is provided with a wired controller fixedly installed on the wall of the air-conditioned room. The wired controller is provided with an operation interface for inputting the set temperature and the operation mode, and a display interface for displaying the real-time temperature of the air-conditioned room and the operating state of the air-conditioning equipment.

[0079] In an alternative embodiment, the indoor unit is provided with a remote controller. The set temperature and the operation mode can be input through the remote controller.

[0080] In an alternative embodiment, the indoor unit is communicatively connected to a mobile control terminal. The mobile control terminal has an application interface through which the set temperature and the operation mode can be input, and the real-time temperature of the air-conditioned room can be displayed. The mobile control terminal can be a computer, a tablet computer, a smart phone, a wearable device, and other intelligent household appliances.

[0081] An indoor control circuit is provided in the indoor unit. Preferably, an indoor controller is provided in the indoor control circuit. The indoor controller is configured to drive the indoor fan 22 to work, display various parameters, implement human-computer interaction, receive and process the sampling signals of various sensors, and implement necessary communication functions. The indoor controller can be a dedicated processor, a central processing unit, etc. The indoor control circuit further includes components such as a storage unit, an input / output interface, and a communication interface. The storage unit may include a volatile memory and / or a non-volatile memory. The storage unit is configured to store instructions or data associated with at least one component of the indoor unit, such as storing application programs. The indoor processor can access the storage unit to execute the instructions stored in the storage unit to implement related functions.

[0082] The input / output interface can be communicatively connected to various sensors provided in the air handling unit to receive the detection values of various sensors provided in the air handling unit. As Figure 2 shown, exemplarily, an indoor return air temperature sensor 34 is provided at the air inlet of the indoor unit to generate the indoor ambient temperature. An indoor heat exchanger 20 pipe temperature sensor, etc. may also be provided in the indoor unit, which will not be listed one by one here. The communication interface can be a software interface supporting different wireless communication protocols, such as WiFi and Bluetooth, etc. A power supply circuit is usually provided on the indoor control circuit to provide 12V and 5V voltages.

[0083] The outdoor control circuit and the indoor control circuit are connected in communication and jointly control the air conditioning device 10. For example, the outdoor ambient temperature can be used as one parameter of the input condition, and the temperature difference between the indoor ambient temperature and the set temperature can be used as another parameter of the input condition to calculate the compressor operation frequency or determine the compressor start and stop time.

[0084] To provide an emergency control strategy, the air conditioning device 10 further includes a backflow determination unit 102 and an operation control unit 104. Figure 3 As shown. The functional composition of the backflow judgment unit 102 and the operation control unit 104 is introduced below: the backflow judgment unit 102 is configured to detect whether the set backflow condition is met during the operation of the air conditioning device 10 to determine whether the supply air of the outdoor unit 26 flows back to the return air outlet. The operation control unit 104 is configured to control the operation of the emergency compressor operation frequency calculated based on the corrected outdoor supply air temperature or the determined emergency compressor start and stop time when the supply air of the outdoor unit 26 flows back to the return air outlet.

[0085] In the air conditioning device 10 provided in the present application, the input conditions under normal operating conditions are integrated with the outdoor ambient temperature generated based on the outdoor return air sensor, and the calculated compressor operating frequency or the determined compressor start and stop time is partially dependent on the outdoor ambient temperature, that is, partially determined by the outdoor ambient temperature generated by the outdoor return air temperature sensor 28; compared with normal operation, the emergency compressor operating frequency and the emergency compressor start and stop time are partially dependent on the corrected outdoor supply air temperature, that is, partially determined by the corrected outdoor supply air temperature, which limits the capacity of the air conditioning device 10 to a certain extent. Under the limited capacity, the air conditioning device 10 can achieve a relatively balanced state between the fault state and the air conditioning capacity, so that the air conditioning device 10 can maintain emergency operation for a period of time in a relatively abnormal state until the set return condition is automatically released under natural conditions or human intervention.

[0086] The processing procedures of the return air judgment unit 102 and the operation control unit 104 are introduced below. In some embodiments of the present application, during the startup phase, the return air judgment unit 102 is configured to: compare the detected value of the outdoor return air temperature sensor 28 with the detected value of the outdoor supply air temperature sensor 30; at two or more different times, calculate the outdoor temperature difference between the detected value of the outdoor return air temperature sensor 28 and the detected value of the outdoor supply air temperature sensor 30; calculate the change in the outdoor temperature difference based on the outdoor temperature differences calculated at different times; obtain the detected values of the indoor return air temperature sensor 34 at two or more different times, and calculate the change in the indoor return air temperature based on the detected values of the indoor return air temperature sensor 34 obtained at different times.

[0087] The return air judgment unit 102 is configured to presume that the set return air condition is satisfied when all of the following conditions are met simultaneously: the detected value of the outdoor return air temperature sensor 28 is different from the detected value of the outdoor supply air temperature sensor 30, the change in the outdoor temperature difference is below the set outdoor temperature difference fluctuation threshold, and the change in the indoor return air temperature is below the set indoor return air temperature fluctuation threshold.

[0088] As Figure 4 shown, during the startup phase, the air conditioning device 10 is configured to start operating in the cooling mode (as shown in step S100). First, it is determined whether the detected value of the outdoor supply air temperature sensor 30 is greater than the detected value of the outdoor return air temperature sensor 28 to determine whether the operation of the air conditioning device 10 is normal and to exclude other hardware failures (as shown in step S101); if so, a set duration timer is started, and the following operations are performed in parallel: calculate the outdoor temperature difference between the detected value of the outdoor return air temperature sensor 28 and the detected value of the outdoor supply air temperature sensor 30 at the start of the set duration, (as shown in step S102); obtain the detected value of the indoor return air temperature sensor 34 (as shown in step S103); maintain the operation in the cooling mode (as shown in step S104); determine whether the set duration has ended (as shown in step S105); if the set duration has ended, the following steps are performed in parallel again: calculate the outdoor temperature difference between the detected value of the outdoor return air temperature sensor 28 and the detected value of the outdoor supply air temperature sensor 30 at the end of the set duration, (as shown in step S106); obtain the detected value of the indoor return air temperature sensor 34 (as shown in step S107); further calculate the change in the outdoor temperature difference, (as shown in step S108); and calculate the change in the indoor return air temperature simultaneously (as shown in step S109); further determine whether the change in the outdoor temperature difference is below the set outdoor temperature difference fluctuation threshold, that is, whether there is (as shown in step S110); at the same time, determine whether the change in the indoor return air temperature is below the set indoor return air temperature fluctuation threshold, that is, whether there is (as shown in step S111); when both and are satisfied, it is presumed that the set return condition is met (as shown in step S112); where represents the start time of the set duration, represents the end time of the set duration, and the set duration is the time period of , preferably set to a short period of time after startup (taking a few minutes as an example, it can also be set longer or shorter according to actual needs), represents the set outdoor temperature difference fluctuation threshold in the cooling mode, represents the indoor return air temperature fluctuation threshold in the cooling mode. In an alternative embodiment, is optionally set to 2 °C, is optionally set to 1 °C.

[0089] In the embodiment as Figure 4 shown, the changes in the outdoor temperature difference and the indoor return air temperature are judged by two sets of values of the start time and the end time of the set duration. It is also possible to use more sets of numerical values to judge the changes in the outdoor temperature difference and the indoor return air temperature to filter out the errors caused by data fluctuations.

[0090] In the heating mode, then as Figure 5 shown, there are multiple processes as shown in the figure.

[0091] As Figure 5 shown, in the startup stage, the air conditioning device 10 is configured to start working in the heating mode (as shown in step S200). First, judge the detected value of the outdoor supply air temperature sensor 30 whether it is less than the detected value of the outdoor return air temperature sensor 28 to determine whether the operation of the air conditioning device 10 is normal and exclude other hardware failures (as shown in step S201); if , then start the set duration timing, and at the same time execute in parallel: calculate the outdoor temperature difference between the detected value of the outdoor return air temperature sensor 28 and the detected value of the outdoor supply air temperature sensor 30 at the start of the set duration, (as shown in step S202); obtain the detected value of the indoor return air temperature sensor 34(as shown in step S203); maintain the heating mode operation (as shown in step S204); determine whether the set duration has ended (as shown in step S205); if the set duration has ended, then execute the following steps in parallel again: calculate the outdoor temperature difference between the detected value of the outdoor return air temperature sensor 28 and the detected value of the outdoor supply air temperature sensor 30 at the end of the set duration, (as shown in step S206); obtain the detected value of the indoor return air temperature sensor 34 (as shown in step S207); further calculate the change in the outdoor temperature difference, (as shown in step S208); simultaneously calculate the change in the indoor return air temperature (as shown in step S209); further determine whether the change in the outdoor temperature difference is below the set outdoor temperature difference fluctuation threshold, that is, whether there is (as shown in step S110); simultaneously determine whether the change in the indoor return air temperature is below the set indoor return air temperature fluctuation threshold, that is, whether there is (as shown in step S111); when both and are satisfied, it is presumed that the set return condition is met (as shown in step S112); where represents the start time of the set duration, represents the end time of the set duration, and the set duration is time period, preferably set to a short period of time after startup (taking a few minutes as an example, it can also be set longer or shorter according to actual needs), represents the set outdoor temperature difference fluctuation threshold in the heating mode, represents the indoor return air temperature fluctuation threshold in the heating mode. In an alternative embodiment, is preferably set to 2 °C, is preferably set to 1 °C.

[0092] In the embodiment as Figure 5 shown, the changes in the outdoor temperature difference and the indoor return air temperature are judged by two sets of values at the start time and end time of the set duration. It is also possible to use more sets of numerical values to judge the changes in the outdoor temperature difference and the indoor return air temperature to filter out the errors caused by data fluctuations.

[0093] The above calculation method can also be judged based on absolute values, which is a common mathematical method and will not be further elaborated here. The set duration is a short period of time after startup, that is, the return judgment unit 102 presumes that the outdoor ambient temperature is very close to the outdoor supply air temperature within a short time, and the indoor return air temperature does not change significantly with the outdoor return air temperature, indicating that the outdoor return air temperature is in a sudden change state and the outdoor supply air returns.

[0094] For the solution of adjusting the rotational speed of the compressor 12 according to the load, in the processing as shown in Figure 4 and Figure 5 , when the air conditioning device 10 is operating normally (faults of other hardware devices can be excluded), the change in the outdoor temperature difference is below the set outdoor temperature difference fluctuation threshold and the change in the indoor return air temperature is below the set indoor return air temperature fluctuation, the reflux judgment unit 102 presumes that the set reflux condition is satisfied and outputs the presumption result to the operation control unit 104, and the operation control unit 104 performs emergency processing. In some alternative embodiments of the present application, the operation control unit 104 is configured to first execute the control of stopping the compressor 12 and generate a maintenance warning signal when receiving that the set reflux condition is satisfied, and operate according to the emergency compressor operation frequency calculated based on the corrected outdoor supply air temperature or the determined emergency compressor start / stop time after receiving the re-start confirmation signal generated by the user. Or in some alternative embodiments of the present application, the operation control unit 104 is configured to operate according to the emergency compressor operation frequency calculated based on the corrected outdoor supply air temperature or the determined emergency compressor start / stop time when receiving that the set reflux condition is satisfied, and at the same time automatically generate a reservation maintenance signal to the cloud server to automatically submit a maintenance request for the air conditioning device 10.

[0095] As shown in Figure 6 , the air conditioning device 10 is further provided with an operation control unit 104. Based on Figure 6 , the air conditioning device 10 provided with the operation control unit 104 is introduced.

[0096] The operation control unit 104 is configured to calculate the set temperature difference between the indoor environmental target temperature set by the user and the detection value of the indoor return air temperature sensor 34, and calculate the compressor operation frequency based on the product of the set temperature difference, the outdoor environmental temperature, and the proportionality coefficient. As shown in Figure 6 , the reflux judgment unit 102 detects whether the set reflux condition is satisfied during operation (as shown in step S300 in Figure 6 ). When the reflux condition is satisfied, it operates according to the emergency compressor operation frequency calculated based on the corrected outdoor supply air temperature (as shown in step S301 in Figure 6 ); when the reflux condition is not satisfied, the compressor operation frequency satisfies ; where is the proportionality coefficient, which is a constant, within the operating frequency of the compressor 12, for example, from 15 Hz to 120 Hz (as shown in step S302 in Figure 6 ).

[0097] As shown in Figure 7As shown, in some alternative embodiments of the present application, a storage unit 308 and a correction unit 310 are further provided in the air conditioning device 10. The storage unit 308 is configured to store historical operation data, and the historical operation data at least includes a linear model between the outdoor ambient temperature and the outdoor supply air temperature obtained through linear regression analysis, where the outdoor ambient temperature is used as the output and the outdoor supply air temperature is used as the input, in the case where the supply air of the outdoor unit 26 does not flow back to the air return opening. The correction unit 310 is configured to use the product of the slope of the linear model and the outdoor supply air temperature in the case where the supply air of the outdoor unit 26 flows back to the air return opening as the corrected outdoor supply air temperature.

[0098] Since the air conditioning device 10 is a coupled system, the outdoor ambient temperature and the outdoor supply air temperature are related in the case where the supply air of the outdoor unit 26 does not flow back to the air return opening. Taking refrigeration as an example, when the outdoor ambient temperature is higher, the calculated compressor operation frequency is higher, and the outdoor supply air temperature correspondingly shows an increasing trend. Therefore, through linear regression analysis, a fitted linear model can be obtained to reflect the relationship between the outdoor ambient temperature and the outdoor supply air temperature. The fitted linear model can be expressed as ; through the fitted linear model, a corresponding outdoor ambient temperature can be obtained based on the outdoor supply air temperature. This is calculated based on the case where the supply air of the outdoor unit 26 does not flow back to the air return opening, and it is a stable and limited temperature.

[0099] In the case where the supply air of the outdoor unit 26 flows back to the air return opening, the correction unit 310 is configured to use the product of the slope of the linear model and the outdoor supply air temperature when the supply air of the outdoor unit 26 flows back to the air return opening as the corrected outdoor supply air temperature, that is , the emergency compressor operation frequency satisfies . Since the set duration is a short period of time after startup, on the premise that other hardware failures have been excluded, it will not (or with an extremely low probability) directly jump to the critical state, and the emergency compressor operation frequency calculated according to the linear model is in a relatively low frequency range, and the air conditioning device 10 can operate stably temporarily in the emergency mode for a period of time, providing a window period for maintenance personnel to perform maintenance and improving user satisfaction.

[0100] The linear model in the storage unit 308 can be obtained under experimental conditions, can also be calculated during actual use, or can be obtained by transmission from a cloud server connected by communication.

[0101] In addition to the above method, the corrected outdoor supply air temperature can also be obtained by looking up a table, or can be set as a constant and obtained by direct calling.

[0102] For the solution where the rotational speed of the compressor 12 remains unchanged, as Figure 9 shown, the air conditioning device 10 further includes a determination unit 406. The determination unit 406 is configured to determine the start and stop times of the compressor based on the magnitude relationship between the detected value of the indoor return air temperature sensor 34 and the tolerance range. In some alternative embodiments of the present application, at least one boundary value of the tolerance range is the product of the corrected set temperature, the correction coefficient, and the outdoor ambient temperature. The operation control unit 104 is configured to, when the air supply of the outdoor unit 26 flows back to the air return opening of the outdoor unit 26, control not to operate according to the start and stop times of the compressor determined by the determination unit 406, but to operate by itself according to the emergency start and stop times of the compressor determined based on the corrected outdoor air supply temperature.

[0103] As Figure 11 shown, the reflux determination unit 102 detects whether the set reflux condition is satisfied during operation (as shown in step S400 in Figure 11 ). When the reflux condition is satisfied, the start and stop times of the compressor are determined based on the magnitude relationship between the detected value of the indoor return air temperature sensor 34 and the tolerance range (as shown in step S401 in Figure 11 ); when the reflux condition is not satisfied, the start and stop times of the compressor are determined based on the magnitude relationship between the detected value of the indoor return air temperature sensor 34 and the tolerance range (as shown in step S402 in Figure 11 ). At least one boundary value of the tolerance range is the product of the corrected set temperature, the correction coefficient, and the outdoor ambient temperature, and the boundary value of the tolerance range can be expressed as , ; is the correction coefficient and is a constant; can be a preset constant, can be 2°C.

[0104] More specifically, as shown in Figure 12 and Figure 18 , in the refrigeration mode, the determination unit 406 is configured to, when the detected value based on the indoor return air temperature sensor 34 is higher than the upper boundary value of the tolerance range (as shown in step S501 in Figure 12 ), determine it as the start time of the compressor 12 (as shown in step S502 in Figure 12 ); when the detected value based on the indoor return air based on the indoor return air temperature sensor 34 is lower than the lower boundary value of the tolerance range (as shown in step S503 in Figure 12 ), determine it as the stop time of the compressor 12 (as shown in step S505 in Figure 12 ); when the detected value based on the indoor return air based on the indoor return air temperature sensor 34 is between the upper boundary value and the lower boundary value of the tolerance range, keep the compressor 12 in the current state (as shown in step S504 in Figure 12 ).

[0105] As Figure 14 and Figure 20 shown, in the heating mode, when the detected value based on the indoor return air temperature sensor 34 is higher than the upper boundary value of the tolerance range (as shown in step S701 in Figure 14 ), it is determined as the shutdown moment of the compressor 12 (as shown in step S702 in Figure 14 ); when the detected value based on the indoor return air based on the indoor return air temperature sensor 34 is higher than the lower boundary value of the tolerance range (as shown in step S703 in Figure 14 ), it is determined as the startup moment of the compressor 12 (as shown in step S705 in Figure 14 ); when the detected value based on the indoor return air based on the indoor return air temperature sensor 34 is between the upper and lower boundary values of the tolerance range, the compressor 12 is maintained in the current state (as shown in step S704 in Figure 14 ).

[0106] The upper boundary value of the tolerance range is the product of the corrected set temperature , the first correction coefficient and the outdoor ambient temperature , that is ; the lower boundary value of the tolerance range is the product of the set temperature , the second correction coefficient and the outdoor ambient temperature ; is a constant.

[0107] As Figure 10 shown, in cooperation with the determination unit 406, the storage unit 308 and the correction unit 310 can achieve similar functions to those in another embodiment above. The operation control unit 104 is configured to determine the emergency compressor start / stop moment based on the magnitude relationship between the detected value of the indoor return air temperature sensor 34 and the size of the corrected tolerance range when the air supply of the outdoor unit 26 flows back to the air return port. At least one boundary value of the corrected tolerance range is the product of the corrected set temperature, the correction coefficient, and the corrected outdoor air supply temperature, that is .

[0108] As Figure 13 and Figure 19 shown, in the cooling mode, the operation control unit 104 is configured to: when the detected value based on the indoor return air temperature sensor 34 is higher than the upper boundary value of the corrected tolerance range (as shown in step S601 in Figure 13 ), it is determined as the startup moment of the compressor 12 (as shown in step S602 in Figure 13 ); when the detected value based on the indoor return air based on the indoor return air temperature sensor 34 is lower than the lower boundary value of the corrected tolerance range (as shown in step S603 in Figure 13 ​as shown in step S603, it is determined as the shutdown moment of the compressor 12 (such as Figure 13 as shown in step S605; when the detected value of the indoor return air temperature sensor 34 is between the upper and lower boundary values of the correction tolerance range, the compressor 12 maintains its current state (such as Figure 13 shown in step S604).

[0109] such as Figure 15 and Figure 21 shown, in the heating mode, the operation control unit 104 is configured to: when the detected value of the indoor return air temperature sensor 34 is higher than the upper boundary value of the correction tolerance range (such as Figure 15 shown in step S801), it is determined as the shutdown moment of the compressor 12 (such as Figure 15 shown in step S802); when the detected value of the indoor return air temperature sensor 34 is higher than the lower boundary value of the correction tolerance range (such as Figure 15 shown in step S803), it is determined as the startup moment of the compressor 12 (such as Figure 15 shown in step S805); when the detected value of the indoor return air temperature sensor 34 is between the upper and lower boundary values of the correction tolerance range, keep the compressor 12 in its current state (such as Figure 15 shown in step S804).

[0110] The upper boundary value of the correction tolerance range is the product of the correction set temperature, the first correction coefficient, and the corrected outdoor supply air temperature, that is ; the lower boundary value of the tolerance range is the product of the set temperature, the second correction coefficient, and the corrected outdoor supply air temperature, .

[0111] By the above method, the startup and shutdown moments of the compressor are restricted to a more stable range, ensuring that the air conditioning equipment can be stably used for a period of time in the emergency state.

[0112] In some alternative embodiments of the present application, such as Figure 16 shown, in the cooling mode, after the operation control unit 104 operates at the emergency compressor operation frequency calculated based on the corrected outdoor supply air temperature, it automatically increases the rotation speed of the outdoor fan 16 to reduce the internal temperature of the outdoor unit 26 (such as Figure 16 shown in step S904), avoiding further hardware failures caused by high temperature.

[0113] In some alternative embodiments of the present application, such as Figure 17As shown, when the air supply of the outdoor unit 26 flows back to the air return opening, the operation control unit 104 is further configured to first operate at the emergency compressor operation frequency calculated based on the corrected outdoor air supply temperature, and then increase the rotation speed of the outdoor fan 16 by itself to reduce the internal temperature of the outdoor unit 26 (as shown in Figure 17 step S914), and further determine whether it increases to the maximum rotation speed (as shown in Figure 17 step S915). If it has increased to the maximum rotation speed, it will execute the control to reduce the emergency compressor operation frequency calculated based on the corrected outdoor air supply temperature by itself to reduce the internal temperature of the outdoor unit 26 (as shown in Figure 17 step S916) to ensure the normal operation of the electronic components in the electrical box.

[0114] In the description of the above embodiments, the specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0115] The above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An air conditioning device, including an outdoor unit with a compressor installed inside, wherein an outdoor return air temperature sensor is provided at the return air inlet to generate an outdoor ambient temperature, and an outdoor supply air temperature sensor is provided at the supply air outlet to generate an outdoor supply air temperature; It is characterized in that, The outdoor ambient temperature can be used to calculate the compressor operation frequency or determine the start / stop time of the compressor; The air conditioning device further includes: A return flow judgment unit configured to detect whether a set return flow condition is satisfied during operation to determine whether there is a situation where the supply air of the outdoor unit flows back to the return air inlet; And An operation control unit configured to, when there is a situation where the supply air of the outdoor unit flows back to the return air inlet, control not to operate according to the compressor operation frequency calculated based on the outdoor ambient temperature or the determined start / stop time of the compressor, but to operate by itself according to the emergency compressor operation frequency calculated based on the corrected outdoor supply air temperature or the determined emergency start / stop time of the compressor.

2. The air conditioning device according to claim 1, characterized in that It further includes an indoor unit, and an indoor return air temperature sensor is provided at the air inlet of the indoor unit; During the startup stage, the return flow judgment unit is configured to: compare the detected value of the outdoor return air temperature sensor with the detected value of the outdoor supply air temperature sensor; at two or more different times, calculate the outdoor temperature difference between the detected value of the outdoor return air temperature sensor and the detected value of the outdoor supply air temperature sensor; Calculate the change of the outdoor temperature difference based on the outdoor temperature differences calculated at different times; obtain the detected values of the indoor return air temperature sensor at two or more different times, and calculate the change of the indoor return air temperature based on the detected values of the indoor return air temperature sensor obtained at different times; The return flow judgment unit is configured to presume that the set return flow condition is satisfied when all of the following conditions are met: the detected value of the outdoor return air temperature sensor is different from the detected value of the outdoor supply air temperature sensor, the change of the outdoor temperature difference is below the set outdoor temperature difference fluctuation threshold, and the change of the indoor return air temperature is below the set indoor return air temperature fluctuation threshold.

3. The air conditioning device according to claim 2, characterized in that, It further includes: A calculation unit configured to calculate the set temperature difference between the indoor environment target temperature set by the user and the detected value of the indoor return air temperature sensor, and calculate the compressor operation frequency based on the product of the set temperature difference, the outdoor ambient temperature, and the proportionality coefficient; The operation control unit is configured to, when there is a situation where the supply air of the outdoor unit flows back to the return air inlet, control not to calculate the compressor operation frequency based on the product of the set temperature difference, the outdoor ambient temperature, and the proportionality coefficient, but to operate by itself according to the emergency compressor operation frequency calculated based on the corrected outdoor supply air temperature.

4. The air conditioning device according to claim 3, characterized in that It further includes: A storage unit configured to store historical operation data, where the historical operation data at least includes a linear model between the outdoor ambient temperature and the outdoor supply air temperature obtained through linear regression analysis in the case where the supply air of the outdoor unit does not flow back to the return air inlet, wherein the outdoor ambient temperature is used as the output and the outdoor supply air temperature is used as the input; and A correction unit configured to use the product of the slope of the linear model and the outdoor supply air temperature when the supply air of the outdoor unit flows back to the return air inlet as the corrected outdoor supply air temperature; The operation control unit is configured to, when the supply air of the outdoor unit flows back to the return air, control not to calculate the compressor operation frequency based on the product of the set temperature difference, the outdoor ambient temperature, and the proportionality coefficient, but to calculate the emergency compressor operation frequency based on the product of the set temperature difference, the corrected outdoor supply air temperature, and the proportionality coefficient by itself.

5. The air conditioning device according to claim 3, characterized in that, Further comprising: A determination unit configured to determine the start and stop times of the compressor based on the magnitude relationship between the detected value of the indoor return air temperature sensor and the tolerance range; wherein, at least one boundary value of the tolerance range is the product of the corrected set temperature, the correction coefficient, and the outdoor ambient temperature; The operation control unit is configured to, when the supply air of the outdoor unit flows back to the return air inlet, control not to operate according to the start and stop times of the compressor determined by the determination unit, but to operate by itself according to the emergency start and stop times of the compressor determined based on the corrected outdoor supply air temperature.

6. The air conditioning device according to claim 5, characterized in that, Further comprising: A storage unit configured to store historical operation data, the historical operation data at least including a linear model between the outdoor ambient temperature and the outdoor supply air temperature obtained through linear regression analysis when the supply air of the outdoor unit does not flow back to the return air inlet, wherein the outdoor ambient temperature is used as the output and the outdoor supply air temperature is used as the input; and A correction unit configured to use the product of the slope of the linear model and the outdoor supply air temperature when the supply air of the outdoor unit flows back to the return air inlet as the corrected outdoor supply air temperature; The operation control unit is configured to, when the supply air of the outdoor unit flows back to the return air inlet, determine the emergency start and stop times of the compressor based on the magnitude relationship between the detected value of the indoor return air temperature sensor and the corrected tolerance range; at least one boundary value of the corrected tolerance range is the product of the corrected set temperature, the correction coefficient, and the corrected outdoor supply air temperature.

7. The air conditioning device according to claim 6, wherein In the cooling mode, the determination unit is configured to: when the detected value based on the indoor return air temperature sensor is higher than the upper boundary value of the tolerance range, determine it as the compressor start time; when the detected value based on the indoor return air based on the indoor return air temperature sensor is lower than the lower boundary value of the tolerance range, determine it as the compressor stop time; When the detected value based on the indoor return air based on the indoor return air temperature sensor is between the upper and lower boundary values of the tolerance range, keep the compressor in its current state; In the heating mode, the determination unit is configured to: when the detected value based on the indoor return air temperature sensor is higher than the upper boundary value of the tolerance range, determine it as the compressor stop time; when the detected value based on the indoor return air based on the indoor return air temperature sensor is higher than the lower boundary value of the tolerance range, determine it as the compressor start time; When the detected value based on the indoor return air based on the indoor return air temperature sensor is between the upper and lower boundary values of the tolerance range, keep the compressor in its current state; The upper boundary value of the tolerance range is the product of the corrected set temperature, the first correction coefficient, and the outdoor ambient temperature; the lower boundary value of the tolerance range is the product of the set temperature, the second correction coefficient, and the outdoor ambient temperature.

8. The air conditioning device according to claim 6, wherein in the cooling mode, the operation control unit is configured to: determine the compressor start time when the detected value based on the indoor return air temperature sensor is higher than the upper boundary value of the corrected tolerance range; determine the compressor stop time when the detected value based on the indoor return air temperature sensor is lower than the lower boundary value of the corrected tolerance range; when the detected value based on the indoor return air temperature sensor is between the upper and lower boundary values of the corrected tolerance range, the compressor maintains its current state; in the heating mode, the operation control unit is configured to: determine the compressor stop time when the detected value based on the indoor return air temperature sensor is higher than the upper boundary value of the corrected tolerance range; determine the compressor start time when the detected value based on the indoor return air temperature sensor is higher than the lower boundary value of the corrected tolerance range; when the detected value based on the indoor return air temperature sensor is between the upper and lower boundary values of the corrected tolerance range, keep the compressor maintaining its current state; The upper boundary value of the corrected tolerance range is the product of the corrected set temperature, the first correction coefficient, and the corrected outdoor supply air temperature; the lower boundary value of the tolerance range is the product of the set temperature, the second correction coefficient, and the corrected outdoor supply air temperature.

9. The air conditioning device according to claim 1, wherein an outdoor fan is further provided in the outdoor unit; in the cooling mode, the operation control unit is further configured to increase the rotation speed of the outdoor fan by itself to reduce the internal temperature of the outdoor unit when the supply air of the outdoor unit flows back to the return air port.

10. The air conditioning device according to claim 9, wherein the operation control unit is further configured to increase the rotation speed of the outdoor fan to the maximum rotation speed by itself when the supply air of the outdoor unit flows back to the return air port, and after reaching the maximum rotation speed, execute the control of reducing the emergency compressor operation frequency calculated based on the corrected outdoor supply air temperature by itself to reduce the internal temperature of the outdoor unit.

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