Air conditioner

Abstract

The invention discloses an air conditioner. According to the air conditioner, when the air conditioner operates in the reheating dehumidification mode, the target indoor temperature is determined according to the difference value between the real-time indoor temperature and the target indoor temperature, and then the target operation state of the air conditioner is determined; the target operation state comprises a reheating dehumidification refrigeration state, a reheating dehumidification isothermal state or a reheating dehumidification heating state, and due to the fact that different target operation states correspond to different values of the rotating speed of the outdoor fan motor, the rotating speed of the indoor fan motor and / or the rotating speed of the compressor, the rotating speed of the outdoor fan motor can be adjusted in the reheating dehumidification refrigeration state or the reheating dehumidification heating state. According to the method, the values of the operation parameters different from those in the reheating dehumidification isothermal state are applied, so that the dehumidification capacity is guaranteed, meanwhile, adjustment of the indoor temperature is further achieved, the deviation between the real-time indoor temperature and the target indoor temperature can be restrained, the dehumidification efficiency is improved, and more comfortable reheating dehumidification operation is achieved.

Description

Technical Field

[0001] The embodiments of the present application relate to air-conditioning technology, and relate to but are not limited to an air conditioner. Background Art

[0002] The air conditioner can operate in reheat dehumidification mode, cooling mode and heating mode. When the difference between the indoor temperature and the set temperature exceeds a first predetermined value, the controller can control the air conditioner to switch from reheat dehumidification operation to cooling operation. When the indoor temperature is lower than a second predetermined value, the controller can control the air conditioner to switch from reheat dehumidification operation to heating operation. However, when switching from reheat dehumidification operation to cooling operation or heating operation, the dehumidification efficiency will decrease. Summary of the Invention

[0003] In view of this, an embodiment of the present application provides an air conditioner that can improve the dehumidification efficiency in the reheat dehumidification mode while maintaining the indoor temperature, thereby improving comfort.

[0004] In a first aspect, an embodiment of the present application provides an air conditioner, comprising:

[0005] a compressor configured to output refrigerant;

[0006] an indoor heat exchanger connected to the compressor and configured to exchange heat with indoor air through the refrigerant;

[0007] an outdoor heat exchanger connected to the compressor and configured to exchange heat with outdoor air through the refrigerant;

[0008] a control valve group, comprising a first control valve, a second control valve, and a third control valve, wherein the first control valve is disposed in a refrigerant flow path of the indoor heat exchanger, a first end of the second control valve is connected to the indoor heat exchanger, a second end of the second control valve is connected to the outdoor heat exchanger, and the third control valve is disposed between the compressor, the indoor heat exchanger, and the outdoor heat exchanger;

[0009] an indoor fan motor, comprising an indoor fan motor, configured to rotate under the drive of the indoor fan motor to send the indoor air out of the air conditioner after passing through the indoor heat exchanger;

[0010] an outdoor fan motor, comprising an outdoor fan motor, configured to rotate under the drive of the outdoor fan motor to send the outdoor air out of the air conditioner after passing through the outdoor heat exchanger;

[0011] a first temperature sensor configured to detect indoor temperature;

[0012] a controller, connected to the compressor, the indoor fan motor, and the outdoor fan motor, respectively, and configured to control the operating frequency of the compressor and the speed of a target motor, the target motor including the indoor fan motor and / or the outdoor fan motor;

[0013] The controller is connected to the control valve group and is configured to control the openings of the first control valve, the second control valve, and the third control valve to operate the air conditioner in a cooling mode, a heating mode, or a reheat dehumidification mode;

[0014] The controller is further configured to: obtain the real-time indoor temperature through the first temperature sensor when the air conditioner is operating in the reheat dehumidification mode; determine the target operating state of the air conditioner based on the correspondence between the preset temperature difference and the operating state, and the temperature difference between the real-time indoor temperature and the target indoor temperature, the target operating state including the reheat dehumidification cooling state, the reheat dehumidification isothermal state or the reheat dehumidification heating state; control the air conditioner to operate in the target operating state, different target operating states correspond to operating parameters with different values, and the operating parameters include part or all of the speed of the outdoor fan motor, the speed of the indoor fan motor and the speed of the compressor.

[0015] In the above-mentioned air conditioner, the target indoor temperature and then the target operating state of the air conditioner are determined based on the difference between the real-time indoor temperature and the target indoor temperature when the air conditioner is operating in the reheat dehumidification mode. The target operating state includes the reheat dehumidification cooling state, the reheat dehumidification isothermal state or the reheat dehumidification heating state. Since different target operating states correspond to different values of the speed of the outdoor fan motor, the speed of the indoor fan motor and / or the speed of the compressor, the speed of the indoor fan motor and / or the speed of the compressor can be used in the reheat dehumidification cooling state or the reheat dehumidification heating state, which is different from the speed of the indoor fan motor and / or the speed of the compressor in the reheat dehumidification cooling state or the reheat dehumidification heating state. This can further achieve adjustment of the indoor temperature while ensuring the dehumidification capacity, and can suppress the deviation between the real-time indoor temperature and the target indoor temperature, thereby improving the dehumidification efficiency and achieving a more comfortable reheat dehumidification operation.

[0016] In some embodiments, the value of the target operating parameter in the reheat dehumidification cooling state is higher than the value of the target operating parameter in the reheat dehumidification isothermal state, and / or the value of the target operating parameter in the reheat dehumidification heating state is higher than the value of the target operating parameter in the reheat dehumidification isothermal state, and the target operating parameters include the speed of the indoor fan motor and / or the speed of the compressor.

[0017] It can be understood that when the reheat dehumidification cooling operation is in progress, the speed of the indoor fan motor and / or the speed of the compressor increases, which can reduce the indoor outlet temperature while maintaining the dehumidification capacity, thereby lowering the room temperature. When the reheat dehumidification heating operation is in progress, the speed of the indoor fan motor and / or the speed of the compressor increases, which can increase the indoor outlet temperature while maintaining the dehumidification capacity, thereby increasing the room temperature.

[0018] In some embodiments, the air conditioner includes at least two operating cycles, and the controller is further configured to:

[0019] When the target operating state in the previous operating cycle is the reheat dehumidification isothermal state and the target operating state in the current operating cycle is the target dehumidification state, the compressor is controlled to increase the speed, and the indoor fan motor is controlled to increase the speed. The target dehumidification state includes the reheat dehumidification cooling state or the reheat dehumidification heating state.

[0020] It can be understood that when switching from the reheat dehumidification isothermal state to the reheat dehumidification cooling state or the reheat dehumidification heating state, directly increasing the speed of the compressor and the speed of the indoor fan motor can shorten the device control process of the air conditioner during state switching and improve the state switching efficiency.

[0021] In some embodiments, the start time of increasing the speed of the compressor is different from the start time of increasing the speed of the indoor fan motor.

[0022] It can be understood that by separating the starting time of increasing the speed of the compressor from the starting time of increasing the speed of the indoor fan motor, the compressor and the indoor fan motor can be controlled separately, avoiding the problem of command conflict when the controller controls the compressor and the indoor fan motor to adjust the speed, thereby improving reliability.

[0023] In some embodiments, the air conditioner further includes a second temperature sensor for detecting outdoor temperature, and the controller is further configured to:

[0024] obtaining the real-time outdoor temperature through the second temperature sensor;

[0025] Determining a target value of a target operating parameter under the target operating state according to the real-time outdoor temperature;

[0026] According to the target value of the target operating parameter, the target device is controlled to operate, and the target device includes the indoor fan motor and / or the compressor.

[0027] It can be understood that the specific values of the speed of the compressor and indoor fan motor are determined according to the real-time outdoor temperature, and the load of the air conditioner can be further adjusted according to the actual environment of the air conditioner to further maintain the real-time indoor temperature at the target indoor temperature.

[0028] In some embodiments, the air conditioner further includes a third temperature sensor disposed on the heat transfer tube of the outdoor heat exchanger and a fourth temperature sensor disposed on the heat transfer tube of the indoor heat exchanger, and the controller is further configured to:

[0029] When the air conditioner is operating in a reheat dehumidification mode, obtaining a condenser temperature collected by the third temperature sensor and an evaporator temperature collected by the fourth temperature sensor;

[0030] The rotation speed of the outdoor fan motor is adjusted according to the condenser temperature and the evaporator temperature.

[0031] It is understandable that since the indoor temperature is affected by the condenser temperature and the evaporator temperature, the indoor temperature is calculated based on the condenser temperature and the evaporator temperature, and the speed of the outdoor fan motor is adjusted accordingly. This can improve the adjustment responsiveness of the outdoor fan motor and achieve more precise control of the indoor temperature.

[0032] In some embodiments, the controller adjusts the speed of the outdoor fan motor according to the condenser temperature and the evaporator temperature, including:

[0033] The controller obtains a real-time average temperature between the condenser temperature and the evaporator temperature;

[0034] The controller determines a target average temperature corresponding to the target indoor temperature according to a correspondence between a preset indoor temperature and an average temperature and the target indoor temperature;

[0035] The controller adjusts the rotation speed of the outdoor fan motor according to the difference between the real-time average temperature and the target average temperature.

[0036] It is understandable that when the indoor temperature is represented by the real-time average temperature between the condenser temperature and the evaporator temperature, the target indoor temperature also needs to be represented by the average temperature between the condenser temperature and the evaporator temperature, so that the speed of the outdoor fan motor can be adjusted according to the real-time average temperature, thereby improving the adjustment responsiveness of the outdoor fan motor.

[0037] In some embodiments, the average temperature in the corresponding relationship is the average temperature between the condenser temperature and the evaporator temperature when the temperature value at the first air outlet is equal to the target indoor temperature, and the first air outlet is the opening on the air conditioner casing corresponding to the indoor fan position.

[0038] It can be understood that when establishing the correspondence between the indoor temperature and the average temperature, directly associating the average temperature between the condenser temperature and the evaporator temperature, and the corresponding target indoor temperature when the temperature value at the first air outlet is equal to the target indoor temperature can save the calculation process of the controller.

[0039] In some embodiments, the controller is further configured to:

[0040] Before the air conditioner operates in the reheat dehumidification mode, a target motor is controlled to operate, and the target motor includes the indoor fan motor and / or the outdoor fan motor.

[0041] It is understandable that before the air conditioner operates in the reheat dehumidification mode, the target motor is controlled to run for a period of time to circulate the air inside the air conditioner, ensure that the indoor temperature detected by the air conditioner is equal to the actual temperature, and improve the detection accuracy of the indoor temperature.

[0042] In some embodiments, after the controller controls the compressor to switch from the working state to the non-working state and before re-entering the working state, the controller controls the target motor to operate.

[0043] It is understandable that after the compressor switches from the working state to the non-working state, the controller controls the target motor to operate, which can ensure that after the air inside the air conditioner circulates through the target motor, no excess hot air will remain inside the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and, together with the specification, are used to illustrate the technical solutions of the present application.

[0045] Figure 1 A schematic structural diagram of an air conditioner provided in an embodiment of the present application;

[0046] Figure 2 A schematic diagram of the structure of an air conditioner according to an embodiment of the present application;

[0047] Figure 3A A refrigerant flow diagram in the reheat dehumidification mode or cooling mode provided in an embodiment of the present application;

[0048] Figure 3BA refrigerant flow diagram in the heating mode provided in an embodiment of the present application;

[0049] Figure 4 This is one of the control flow diagrams of the controller provided in the embodiment of the present application;

[0050] Figure 5 A schematic diagram showing how the reheat dehumidification mode changes with temperature difference according to an embodiment of the present application;

[0051] Figure 6 A schematic diagram of the improvement effect in the reheat dehumidification mode provided in an embodiment of the present application;

[0052] Figure 7 This is one of the control flow diagrams in the reheat dehumidification mode provided in an embodiment of the present application;

[0053] Figure 8 The second control flow diagram of the controller provided in the embodiment of the present application;

[0054] Figure 9 A schematic diagram of the installation positions of the first temperature sensor and the second temperature sensor provided in an embodiment of the present application;

[0055] Figure 10 A schematic diagram of the implementation flow of the controller provided in the embodiment of the present application;

[0056] Figure 11 The third control flow diagram of the controller provided in the embodiment of the present application;

[0057] Figure 12 This is the second control flow chart of the reheat dehumidification mode provided in the embodiment of the present application;

[0058] Figure 13 A schematic diagram of a sensing temperature improvement mechanism of the first temperature sensor provided in an embodiment of the present application;

[0059] Figure 14 A schematic diagram of a sensing temperature improvement mechanism of the second temperature sensor provided in an embodiment of the present application;

[0060] Figure 15 This is a control flow chart for starting reheat dehumidification mode operation during compressor protection stop provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the specific technical solutions of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but are not intended to limit the scope of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0063] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0064] It should be pointed out that the terms "first\second\third" involved in the embodiments of the present application are used to distinguish similar or different objects, and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0065] Figure 1 This is a schematic diagram of the structure of an air conditioner provided in an embodiment of the present application. Figure 1 As shown, the air conditioner 100 may include a compressor 1 having an air inlet and an air outlet. The refrigerant can flow out of the air outlet of the compressor 1 to flow to other components of the air conditioner 100, and the refrigerant can also flow back into the compressor 1 from the air inlet to complete the refrigerant circulation.

[0066] The air conditioner 100 may include an outdoor heat exchanger 3, which is used to exchange heat with the outdoor air. The outdoor heat exchanger 3 may include a tube-fin heat exchanger, a plate heat exchanger or a shell-and-tube heat exchanger, etc., so that the outdoor heat exchanger 3 can be used to absorb the heat of the outdoor air or release the heat of the refrigerant into the outdoor air.

[0067] In some embodiments, during the heat exchange process between the outdoor heat exchanger 3 and the outdoor air, the refrigerant may first exchange heat with the target medium, and then the target medium may exchange heat with the outdoor air. The target medium may include water, brine solution, refrigerant or antifreeze, etc. The refrigerant may be, for example, Freon, and the antifreeze may be, for example, ethylene glycol solution. Alternatively, the refrigerant may directly exchange heat with the outdoor air. The specific setting is made by the user according to the actual situation, and the embodiment of the present application does not impose any restrictions.

[0068] In some embodiments, the air conditioner 100 may include an outdoor fan 4, which is arranged on one side of the outdoor heat exchanger 3, and is used to transmit outside air to the outdoor heat exchanger 3 through a second air inlet of the air conditioner casing, and to transmit the air flowing through the outdoor heat exchanger 3 to the outside through a second air outlet of the air conditioner casing. The second air outlet is an opening on the air conditioner casing corresponding to the position of the outdoor fan 4, and the second air inlet is an opening on the air conditioner casing corresponding to the position of the outdoor fan 4. The positions of the second air outlet and the second air inlet are different.

[0069] It can be understood that the outdoor fan 4 is arranged close to the outdoor heat exchanger 3. The outdoor fan 4 can include a first fan and an outdoor fan motor. The first fan is fixedly arranged on the rotating shaft of the outdoor fan motor. The outdoor fan motor is connected to the controller of the air conditioner to drive the first fan to rotate under the control of the controller to transmit the outdoor air to the outdoor heat exchanger 3, thereby realizing heat exchange between the outdoor heat exchanger 3 and the outdoor air.

[0070] The air conditioner 100 may include an indoor heat exchanger 5, which is used to exchange heat between the refrigerant flowing out of the compressor 1 and the indoor air. In this way, the indoor heat exchanger 5 can absorb heat in the room to achieve indoor cooling, or can release heat to the room to achieve indoor heating. The indoor heat exchanger 5 may include a plate heat exchanger or a shell and tube heat exchanger.

[0071] Among them, the first end of the indoor heat exchanger 5 is connected to the first end of the outdoor heat exchanger 3, so that the refrigerant can flow from the first end of the outdoor heat exchanger 3 to the indoor heat exchanger 5, or the refrigerant can also flow from the first end of the indoor heat exchanger 5 to the outdoor heat exchanger 3, and then the mode of the air conditioner 100 can be switched so that the indoor heat exchanger 5 can act as a condenser or evaporator, thereby realizing indoor cooling, heating or reheating dehumidification.

[0072] In some embodiments, during the heat exchange process between the indoor heat exchanger 5 and the indoor air, the refrigerant may first exchange heat with the target medium, and then the target medium may exchange heat with the indoor air. The target medium may include water, brine solution, refrigerant or antifreeze, etc. The refrigerant may be, for example, Freon, and the antifreeze may be, for example, ethylene glycol solution. Alternatively, the refrigerant may directly exchange heat with the indoor air. The specific setting is made by the user according to the actual situation, and the embodiment of the present application does not impose any restrictions.

[0073] In some embodiments, the air conditioner 100 may include an indoor fan 6, which is arranged on one side of the indoor heat exchanger 5, and is used to transmit outside air to the indoor heat exchanger 5 through a first air inlet of the air conditioner casing, and to transmit the air flowing through the indoor heat exchanger 5 to the outside through a first air outlet of the air conditioner casing. The first air outlet is an opening on the air conditioner casing corresponding to the position of the indoor fan 6, and the first air inlet is an opening on the air conditioner casing corresponding to the position of the indoor fan 6. The positions of the first air outlet and the first air inlet are different.

[0074] It can be understood that the indoor fan is arranged close to the indoor heat exchanger 5, and the indoor fan 6 can include a second fan and an indoor fan motor. The second fan is fixedly arranged on the rotating shaft of the indoor fan motor, and the indoor fan motor is connected to the controller of the air conditioner to drive the second fan to rotate under the control of the controller to transmit the indoor air to the indoor heat exchanger 5, thereby realizing heat exchange between the indoor heat exchanger 5 and the indoor air.

[0075] The air conditioner 100 may include a control valve group connected to a controller to adjust the opening degree under the control of the controller so that the air conditioner 100 operates in a cooling mode, a heating mode or a reheat dehumidification mode.

[0076] In some embodiments, the control valve group may include a third control valve 2, which is respectively connected to the air inlet, air outlet, outdoor heat exchanger 3 and indoor heat exchanger 5 of the compressor 1. The third control valve 2 can control the flow direction of the refrigerant, so that one of the outdoor heat exchanger 3 and the indoor heat exchanger 5 acts as a condenser and the other acts as an evaporator.

[0077] For example, the third control valve 2 can control the flow direction of the refrigerant and perform one of the following functions:

[0078] 1. Refrigeration function: The refrigerant flows out of the outdoor heat exchanger 3 and then flows back to the compressor 1 through the indoor heat exchanger 5. The outdoor heat exchanger 3 releases the heat in the refrigerant to the outdoor environment, acting as a condenser to liquefy the refrigerant. At the same time, the indoor heat exchanger 5 absorbs the heat from the indoor air and acts as an evaporator to evaporate the refrigerant, thereby achieving indoor cooling.

[0079] 2. The heating function allows the refrigerant to flow out of the indoor heat exchanger 5 and then flow back to the compressor 1 through the outdoor heat exchanger 3, so that the indoor heat exchanger 5 releases the heat in the refrigerant to the indoor environment to act as a condenser. At the same time, the outdoor heat exchanger 3 absorbs heat from the outdoor air to act as an evaporator, thereby achieving indoor heating.

[0080] In some embodiments, the third control valve 2 may include a four-way valve, a first end of the four-way valve being connected to the outdoor heat exchanger 3, a second end of the four-way valve being connected to the air inlet of the compressor 1, a third end of the four-way valve being connected to the air outlet of the compressor 1, and a fourth end of the four-way valve being connected to the indoor heat exchanger 5. The controller may control the conduction state of the four-way valve between the four ports to determine whether the refrigerant passes through the indoor heat exchanger 5 or the outdoor heat exchanger 3 first after flowing out of the compressor 1.

[0081] In some embodiments, the air conditioner may include a first control valve 7, which may be arranged in the refrigerant flow path of the indoor heat exchanger 5 to divide the flow path of the indoor heat exchanger 5 into a reheating section flow path for converting a part of the incoming air into hot air, and / or a dehumidification section flow path for converting another part of the incoming air into cold air, thereby realizing the reheat and dehumidification function.

[0082] The air conditioner can realize cooling, heating or reheat dehumidification functions by controlling the opening of the first control valve 7. For example, in the cooling or heating mode, the first control valve 7 can be opened to the maximum opening to enable the cooling or heating mode to operate normally. In the reheat dehumidification mode, the first control valve 7 divides the flow path of the indoor heat exchanger 5 into a reheat section flow path for converting a part of the incoming air into hot air and a dehumidification section flow path for converting another part of the incoming air into cold air. In this way, the heat exchange performance of the reheat section flow path and the dehumidification section flow path can be controlled by adjusting the opening of the first control valve 7, thereby achieving the reheat dehumidification effect.

[0083] The first control valve 7 can heat part of the air flowing through the indoor heat exchanger 5 by the reheating section, and cool and dehumidify the other part by the dehumidification section. Then, these two parts of air are mixed under the drive of the indoor fan 6 and the mixed air is blown out.

[0084] In other embodiments, if the indoor heat exchanger 5 includes a first indoor heat exchanger 51 and a second indoor heat exchanger 52, the first control valve 7 can also be arranged between the first indoor heat exchanger 51 and the second indoor heat exchanger 52, the first indoor heat exchanger 51 is used to convert the incoming air into hot air, and the second indoor heat exchanger 52 is used to convert the incoming air into cold air, thereby realizing the reheat dehumidification function.

[0085] The first control valve 7 can divide the first indoor heat exchanger 51 and the second indoor heat exchanger 52 into a dehumidification section and a reheating section to blow out cold air and hot air respectively. For example, Figure 2 The first indoor heat exchanger 51 in the embodiment serves as the reheat section, blowing out hot air. The second indoor heat exchanger 52 serves as the dehumidification section, blowing out cold air. The indoor fan 6 mixes the hot and cold air and blows out the mixed air for dehumidification. Specifically, the first control valve 7 in this embodiment can be an electronic expansion valve or a solenoid valve. The opening of the electronic expansion valve or solenoid valve controls the heat exchange performance of the reheat and dehumidification sections of the indoor heat exchanger 5.

[0086] Preferably, the first control valve 7 can be a solenoid valve, so that in the reheat dehumidification mode, the flow rate of the refrigerant between the reheat section flow path and the dehumidification section flow path is constant when the speed of the compressor 1 is constant. Therefore, when those skilled in the art adjust the amount of hot air flowing through the reheat section flow path and the amount of cold air flowing through the dehumidification section flow path, they can only adjust the speed of the compressor 1 and the speed of the indoor fan 6, without adjusting the opening of the first control valve 7, thereby reducing the control process.

[0087] In some embodiments, the air conditioner may further include a second control valve 8, which is disposed between the outdoor heat exchanger 3 and the indoor heat exchanger 5 and is configured to adjust the flow of the refrigerant between the indoor heat exchanger 5 and the outdoor heat exchanger 3. In this embodiment, the second control valve 8 may be an electronic expansion valve or a solenoid valve.

[0088] Combine Figure 3A In the cooling mode, the controller controls the first control valve 7 to be adjusted to the maximum opening, and the second control valve 8 to be adjusted to the target opening. The target opening is smaller than the maximum opening of the first control valve 7. After the compressor 1 outputs the refrigerant, it passes through the four-way valve, the outdoor heat exchanger 3, the second control valve 8, the first indoor heat exchanger 51, the first control valve 7, the second indoor heat exchanger 52, the four-way valve and the compressor 1 in sequence, so that the outdoor heat exchanger 3 becomes the heating side and can act as a condenser, and the first indoor heat exchanger 51 and the second indoor heat exchanger 52 are both the cooling side and act as evaporators.

[0089] Combine Figure 3B In the heating mode, the controller controls the first control valve 7 to be adjusted to the maximum opening, and the second control valve 8 to be adjusted to the target opening. The target opening is smaller than the maximum opening of the first control valve 7. After the compressor 1 outputs the refrigerant, it passes through the four-way valve, the second indoor heat exchanger 52, the first control valve 7, the first indoor heat exchanger 51, the second control valve 8, the outdoor heat exchanger 3, the four-way valve and the compressor 1 in sequence, so that the outdoor heat exchanger 3 becomes the cooling side and acts as an evaporator, and the first indoor heat exchanger 51 and the second indoor heat exchanger 52 are both the heating side and can act as a condenser.

[0090] Combine Figure 3A In the reheat dehumidification mode, the controller controls the second control valve 8 to be adjusted to the maximum opening, and the first control valve 7 to be adjusted to the target opening. The target opening is smaller than the maximum opening of the first control valve 7. After the compressor 1 outputs the refrigerant, it passes through the four-way valve, the outdoor heat exchanger 3, the second control valve 8, the first indoor heat exchanger 51, the first control valve 7, the second indoor heat exchanger 52, the four-way valve and the compressor 1 in sequence, so that the first indoor heat exchanger 51 becomes the heating side and acts as a condenser, and the second indoor heat exchanger 52 becomes the cooling and dehumidification side and acts as an evaporator.

[0091] When the controller detects that the difference between the indoor temperature and the set temperature exceeds a first predetermined value, the air conditioner can be controlled to switch from the reheat dehumidification mode to the cooling mode. When the indoor temperature is lower than a second predetermined value, the air conditioner can be controlled to switch from the reheat dehumidification mode to the heating mode. However, the dehumidification efficiency decreases when switching from the reheat dehumidification mode to the cooling mode or the heating mode for the following reasons:

[0092] 1. When operating in heating mode, the indoor fan 6 cannot blow out a mixed air composed of hot air and cold air, so the air conditioner cannot perform dehumidification. When switching from reheat dehumidification mode to heating mode, the controller needs to control the conduction state of the four-way valve. The compressor 1 will stop working during the process of switching the four-way valve.

[0093] 2. If the first control valve 7 is a solenoid valve, when switching from the reheat dehumidification mode to the cooling mode, the solenoid valve is required to ensure that the pressure difference is maintained below a certain pressure value before and after the switch, so it is necessary to temporarily stop the operation of the compressor 1.

[0094] In order to solve the above problems, an embodiment of the present application proposes an air conditioner, which determines the target indoor temperature and then the target operating state of the air conditioner based on the difference between the real-time indoor temperature and the target indoor temperature when the air conditioner is operating in the reheat dehumidification mode. The target operating state includes a reheat dehumidification cooling state, a reheat dehumidification isothermal state or a reheat dehumidification heating state. Since different target operating states correspond to different values of the speed of the outdoor fan motor, the speed of the indoor fan motor and the speed of the compressor 1, the speed of the outdoor fan motor, the speed of the indoor fan motor and / or the speed of the compressor 1 can be used in the reheat dehumidification cooling state or the reheat dehumidification heating state, which are different from those in the reheat dehumidification isothermal state. The speed can further adjust the indoor temperature while ensuring the dehumidification capacity, and the deviation between the real-time indoor temperature and the target indoor temperature can be suppressed, thereby improving the dehumidification efficiency and achieving a more comfortable reheat dehumidification operation.

[0095] In some embodiments, based on Figure 1-2 In any of the air conditioner structures shown, the controller of the air conditioner is configured to perform the following steps: Figure 4 As shown:

[0096] Step S101, when the air conditioner is operating in a reheat dehumidification mode, obtaining a real-time indoor temperature through a first temperature sensor;

[0097] Step S102, determining a target operating state of the air conditioner based on a correspondence between a preset temperature difference and an operating state, and a temperature difference between the real-time indoor temperature and a target indoor temperature, wherein the target operating state includes a reheat dehumidification cooling state, a reheat dehumidification isothermal state, or a reheat dehumidification heating state;

[0098] Step S103 , controlling the air conditioner to operate in a target operating state. Different target operating states correspond to operating parameters with different values. The operating parameters include part or all of the speed of the outdoor fan motor, the speed of the indoor fan motor, and the speed of the compressor 1 .

[0099] In some embodiments, the controller may be triggered to control the air conditioner to operate in the reheat-dehumidification mode by receiving a user-triggered control instruction, wherein the control instruction is used to instruct the air conditioner to operate in the reheat-dehumidification mode. The control instruction may be triggered by the user via a remote control transmitter and output to the air conditioner's remote control receiver, so that the controller controls the air conditioner to implement the reheat-dehumidification mode execution process according to the received control instruction.

[0100] It should be understood that the reheat dehumidification mode can be divided into different application scenarios based on the user's temperature requirements. For example, in early summer or autumn rainy season, when the temperature is not too high but the humidity is high, reheat dehumidification needs to be performed while maintaining the target indoor temperature; in hot and humid nights or early mornings with no airflow, dehumidification can be performed without excessively lowering the temperature; and during the rainy season, dehumidification is performed when it is necessary to keep the room dry.

[0101] Therefore, in the reheat dehumidification mode, the controller needs to further determine whether to perform a dehumidification operation, such as cooling, isothermal, or heating, based on the difference between the real-time indoor temperature and the target indoor temperature. For example, if the current indoor temperature is maintained at a temperature level higher than the target indoor temperature, the dehumidification operation needs to be performed according to the reheat dehumidification cooling state, thereby simultaneously lowering the real-time indoor temperature to the target indoor temperature; if the current indoor temperature is maintained at a temperature level lower than the target indoor temperature, the dehumidification operation needs to be performed according to the reheat dehumidification heating state, thereby simultaneously raising the real-time indoor temperature to the target indoor temperature; if the difference between the current indoor temperature and the target indoor temperature is small, the dehumidification operation needs to be performed according to the reheat dehumidification isothermal state, thereby simultaneously maintaining the indoor temperature at the target indoor temperature.

[0102] When the air conditioner performs reheat dehumidification cooling, it is necessary to increase the heat dissipation capacity of the outdoor heat exchanger 3 and / or the second indoor heat exchanger 52 and reduce the heating capacity of the air by the first indoor heat exchanger 51 used as a heater.

[0103] In addition, when the air conditioner performs the reheat dehumidification heating state, it is necessary to increase the heating capacity of the first indoor heat exchanger 51 and reduce the heat dissipation capacity of the outdoor heat exchanger 3 and / or the second indoor heat exchanger 52; when the air conditioner performs the reheat dehumidification isothermal state, it is necessary to maintain the heating capacity of the first indoor heat exchanger 51 and the heat dissipation capacity of the outdoor heat exchanger 3 and / or the second indoor heat exchanger 52.

[0104] When the air conditioner is in the reheat dehumidification isothermal state, the air conditioner only needs to maintain the heating capacity of the first indoor heat exchanger 51 and the heat dissipation capacity of the outdoor heat exchanger 3 and / or the second indoor heat exchanger 52.

[0105] For example, Figure 5 As shown, the controller obtains the temperature difference between the real-time indoor temperature and the target indoor temperature, and then executes the cooling mode when the temperature difference is greater than the first difference threshold value T1; when the temperature difference is less than or equal to the first difference threshold value T1 and greater than the second difference threshold value T2, it executes the reheat dehumidification cooling state, increases the heat dissipation capacity of the outdoor heat exchanger 3 and / or the second indoor heat exchanger 52, and reduces the heating capacity of the first indoor heat exchanger 51 used as a heater for the air; when the temperature difference is greater than or equal to the third difference threshold value T3 and less than or equal to the When the second difference threshold value T2 is reached, the reheat dehumidification isothermal state is executed to maintain the heating capacity of the first indoor heat exchanger 51 and the heat dissipation capacity of the outdoor heat exchanger 3 and / or the second indoor heat exchanger 52; when the temperature difference is less than the third difference threshold value T3 and greater than or equal to the fourth difference threshold value T4, the reheat dehumidification heating state is executed to increase the heating capacity of the first indoor heat exchanger 51 and reduce the heat dissipation capacity of the outdoor heat exchanger 3 and / or the second indoor heat exchanger 52; when the temperature difference is less than the fourth difference threshold value T4, the heating mode is executed.

[0106] Among them, the controller can provide more air flow to the outdoor heat exchanger 3 by increasing the speed of the outdoor fan motor, thereby increasing the heat dissipation capacity of the outdoor heat exchanger 3, and vice versa, reduce the speed of the outdoor fan motor; or, the controller can provide more air flow to the indoor heat exchanger 5 by increasing the speed of the indoor fan motor, thereby increasing the heat dissipation capacity of the second indoor heat exchanger 52 and shortening the heating time of the air flow by the first indoor heat exchanger 51, and vice versa, reduce the speed of the indoor fan motor; or, the controller can also increase the speed of the compressor 1, thereby increasing the flow rate and flow of the refrigerant between the indoor heat exchanger 5 and the outdoor heat exchanger 3, thereby further realizing the regulation of the heat dissipation capacity and heating capacity, and vice versa, reduce the speed of the compressor 1.

[0107] In some embodiments, the controller can control the speed of only the indoor fan motor, the outdoor fan motor and some components in the compressor 1, or it can control the speed of all components in the indoor fan motor, the outdoor fan motor and the compressor 1. The specific setting is made by those skilled in the art according to actual conditions, and the embodiments of this application are not limited.

[0108] It should be understood that when adjusting the speed of the outdoor fan motor, the sensible heat capacity of the air conditioner can be adjusted. The sensible heat capacity is determined according to the indoor temperature. For example, when the reheat dehumidification cooling operation is in progress, the speed of the outdoor fan motor increases. By suppressing the heating amount of the first indoor heat exchanger, the outlet temperature of the indoor fan motor can be reduced, thereby lowering the room temperature; when the reheat dehumidification isothermal operation is in progress, the speed of the outdoor fan motor remains unchanged, the heating amount of the first indoor heat exchanger can be kept unchanged, and the outlet temperature of the indoor fan motor can be maintained; when the reheat dehumidification heating operation is in progress, the speed of the outdoor fan motor decreases, the heating amount of the first indoor heat exchanger can be increased, and the outlet temperature of the indoor fan motor can be increased, thereby raising the room temperature.

[0109] When adjusting the speed of the indoor fan motor and / or compressor 1, in addition to adjusting the sensible heat capacity of the air conditioner, the latent heat capacity of the air conditioner can also be adjusted. The latent heat capacity is determined according to the humidity in the indoor environment, for example, Figure 6 As shown, during the reheat dehumidification cooling operation, the sensible heat capacity is increased by a certain value after the speed of the outdoor fan motor increases, and the sensible heat capacity and latent heat capacity will both increase after the speed of the compressor 1 increases, and the increase in the speed of the indoor fan motor further increases the sensible heat capacity. At the same time, the sensible heat ratio can be adjusted to maintain the latent heat capacity at the same level as when the reheat dehumidification isothermal state is operated; during the reheat dehumidification heating operation, the sensible heat capacity is increased by a certain value after the speed of the outdoor fan motor decreases, and the sensible heat capacity and latent heat capacity will both increase after the speed of the compressor 1 increases, and the increase in the speed of the indoor fan motor further increases the sensible heat capacity. At the same time, the sensible heat ratio can be adjusted to maintain the latent heat capacity at the same level as when the reheat dehumidification isothermal state is operated.

[0110] However, if only the speed of the outdoor fan motor is adjusted, the indoor temperature will be more likely to drop in the reheat dehumidification cooling state, and the indoor temperature will be more likely to rise in the reheat dehumidification heating state, resulting in a large deviation between the actual indoor temperature and the target indoor temperature in the reheat dehumidification mode. Therefore, when adjusting the speed of the outdoor fan motor, it is necessary to adjust the speed of the indoor fan motor and / or compressor 1 at the same time to further improve the sensible heat capacity.

[0111] In some embodiments, the speed of the indoor fan motor and the compressor 1 in the reheat dehumidification cooling state is higher than the speed value in the reheat dehumidification isothermal state, and / or the speed of the indoor fan motor and the compressor 1 in the reheat dehumidification heating state is higher than the speed value in the reheat dehumidification isothermal state, thereby improving the sensible heat capacity in the reheat dehumidification cooling state and the reheat dehumidification heating state.

[0112] For example, Figure 7As shown, when the temperature difference is greater than or equal to the third difference threshold T3 and less than or equal to the second difference threshold T2, the air conditioner operates in the reheat dehumidification isothermal state, and the controller can control the outdoor fan motor speed, the indoor fan motor speed, and the compressor 1 speed to maintain a certain value; when the temperature difference is greater than the second difference threshold T2, the air conditioner operates in the reheat dehumidification cooling state, and the controller can control the outdoor fan motor speed, the indoor fan motor speed, and the compressor 1 speed to operate at a value higher than the reheat dehumidification isothermal state; when the temperature difference is less than the third difference threshold T3, the air conditioner operates in the reheat dehumidification heating state, and the controller can control the outdoor fan motor speed to operate at a value lower than the reheat dehumidification isothermal state, and control the indoor fan motor speed and the compressor 1 speed to operate at a value higher than the reheat dehumidification isothermal state.

[0113] It can be understood that when the reheat dehumidification cooling operation is in progress, the speed of the indoor fan motor and / or the speed of the compressor 1 increases, which can reduce the indoor outlet temperature while maintaining the dehumidification capacity, thereby lowering the room temperature. When the reheat dehumidification heating operation is in progress, the speed of the indoor fan motor and / or the speed of the compressor 1 increases, which can increase the indoor outlet temperature while maintaining the dehumidification capacity, thereby increasing the room temperature.

[0114] In some embodiments, the air conditioner includes at least two operating cycles, and the controller is further configured to:

[0115] When the target operating state in the previous operating cycle is the reheat dehumidification isothermal state and the target operating state in the current operating cycle is the target dehumidification state, the compressor 1 is controlled to increase the speed, and the indoor fan motor is controlled to increase the speed. The target dehumidification state includes the reheat dehumidification cooling state or the reheat dehumidification heating state.

[0116] It should be understood that in the use scenario of the air conditioner, due to user activities, the indoor temperature detected in the current cycle is often significantly different from the detected temperature in the previous cycle. Therefore, when the air conditioner is operating in the reheat dehumidification mode, the controller will switch between states according to the real-time detected indoor temperature, such as switching from reheat dehumidification isothermal to reheat dehumidification cooling state or reheat dehumidification heating state. At this time, because the air conditioner itself is operating at the working parameters of the previous state, the controller can directly adjust the working parameters according to the corresponding adjustment value based on the value of the working parameter.

[0117] For example, when the target operating state in the previous operating cycle is the reheat dehumidification isothermal state, and the target operating state in the current operating cycle is the reheat dehumidification refrigeration state, the controller can directly control the compressor 1 to increase the speed according to the first adjustment value, control the indoor fan motor to increase the speed according to the second adjustment value, and control the outdoor fan motor to increase the speed according to the third adjustment value. The first adjustment value is the difference between the value of the compressor 1 in the reheat dehumidification refrigeration state and the value in the reheat dehumidification isothermal state, the second adjustment value is the difference between the value of the indoor fan motor in the reheat dehumidification refrigeration state and the value in the reheat dehumidification isothermal state, and the third adjustment value is the difference between the value of the outdoor fan motor in the reheat dehumidification refrigeration state and the value in the reheat dehumidification isothermal state.

[0118] When the target operating state in the previous operating cycle is the reheat dehumidification isothermal state, and the target operating state in the current operating cycle is the reheat dehumidification heating state, the controller can directly control the compressor 1 to increase the speed according to the fourth adjustment value, control the indoor fan motor to increase the speed according to the fifth adjustment value, and control the outdoor fan motor to reduce the speed according to the sixth adjustment value. The fourth adjustment value is the difference between the value of the compressor 1 in the reheat dehumidification heating state and the value in the reheat dehumidification isothermal state, the fifth adjustment value is the difference between the value of the indoor fan motor in the reheat dehumidification heating state and the value in the reheat dehumidification isothermal state, and the sixth adjustment value is the difference between the value of the outdoor fan motor in the reheat dehumidification heating state and the value in the reheat dehumidification isothermal state.

[0119] It can be understood that when switching from the reheat dehumidification isothermal state to the reheat dehumidification cooling state or the reheat dehumidification heating state, directly increasing the speed of the compressor 1 and the speed of the indoor fan motor can shorten the device control process of the air conditioner during state switching and improve the state switching efficiency.

[0120] In some embodiments, the start time for the compressor 1 to adjust the speed, the start time for the indoor fan motor to adjust the speed, and the start time for the outdoor fan motor to adjust the speed may be different or the same, and may be specifically set by those skilled in the art according to actual conditions, and the embodiments of this application do not limit this.

[0121] Among them, the controller can send corresponding control signals when controlling the speed of compressor 1, the speed of indoor fan motor and outdoor fan motor. For example, the controller will send a first control signal to compressor 1 to control the speed of compressor 1. The first control signal can indicate the starting time for compressor 1 to adjust the speed. Similarly, the controller will send a second control signal to the indoor fan motor to indicate the starting time for compressor 1 to adjust the speed, thereby controlling the speed of the indoor fan motor. The controller will send a third control signal to the outdoor fan motor to indicate the starting time for compressor 1 to adjust the speed, thereby controlling the speed of the outdoor fan motor.

[0122] When the start time of adjusting the speed of compressor 1, the start time of adjusting the speed of indoor fan motor and the start time of adjusting the speed of outdoor fan motor are different, the start time indicated by the first control signal, the second control signal and the third control signal are different; when the start time of adjusting the speed of compressor 1, the start time of adjusting the speed of indoor fan motor and the start time of adjusting the speed of outdoor fan motor are the same, the start time indicated by the first control signal, the second control signal and the third control signal are the same.

[0123] It can be understood that by separating the starting time of increasing the speed of the compressor 1 from the starting time of increasing the speed of the indoor fan motor, the compressor 1 and the indoor fan motor can be controlled separately, avoiding the problem of command conflict when the controller controls the compressor 1 and the indoor fan motor to adjust the speed, thereby improving reliability.

[0124] In some embodiments, there may be a corresponding correspondence between the operating state and the values of the operating parameters. The controller obtains the operating parameters of the target values under the target operating state by searching the correspondence. For example, the correspondence may indicate: in the reheat dehumidification cooling state, the compressor 1 runs at a high speed, the indoor fan motor runs at a high speed, and the outdoor fan motor runs at a high speed; in the reheat dehumidification heating state, the compressor 1 runs at a medium speed, the indoor fan motor runs at a medium speed, and the outdoor fan motor runs at a low speed; in the reheat dehumidification isothermal state, the compressor 1 runs at a low speed, the indoor fan motor runs at a low speed, and the outdoor fan motor runs at a medium speed.

[0125] During reheat dehumidification cooling operation, the cooling load increases as the outdoor temperature rises. To lower the indoor temperature, a higher cooling sensible heat capacity is required. Therefore, different outdoor temperature conditions require different indoor fan motor speeds and compressor 1 speeds. In reheat dehumidification heating mode, the heating load increases as the outdoor temperature drops. Therefore, a higher heating sensible heat capacity is required to raise the indoor temperature.

[0126] Therefore, in some other embodiments, the outdoor temperature may be further added to the correspondence between the operating state and the value of the operating parameter, forming a correspondence between the operating state, the outdoor temperature, and the value of the operating parameter. That is, the air conditioner further includes a second temperature sensor for detecting the outdoor temperature, and the controller is further configured as follows:

[0127] obtaining the real-time outdoor temperature through a second temperature sensor;

[0128] Determine the target values of the operating parameters under the target operating state according to the real-time outdoor temperature;

[0129] According to the target value operating parameters, the target device is controlled to operate, and the target device includes the indoor fan motor and / or the compressor 1.

[0130] For example, as shown in Tables 1 and 2, when the outdoor temperature is greater than the first predetermined temperature (TO1), in the reheat dehumidification refrigeration state, the compressor 1 and the indoor fan motor both operate at high speed, and the outdoor fan motor still operates at high speed; when the outdoor temperature is less than or equal to the first predetermined temperature (TO1), the compressor 1 and the indoor fan motor both operate at medium speed, and the outdoor fan motor still operates at high speed.

[0131] In the reheat dehumidification heating mode, when the outdoor temperature is greater than or equal to the second predetermined temperature (TO2), the compressor 1 and the indoor fan motor both operate at a medium speed, while the outdoor fan motor still operates at a low speed. When the outdoor temperature is less than the second predetermined temperature (TO2), the compressor 1 and the indoor fan motor both operate at a high speed, while the outdoor fan motor still operates at a low speed. The first predetermined temperature (TO1) is greater than the second predetermined temperature (TO2).

[0132] In the reheat dehumidification isothermal state, regardless of whether the outdoor temperature exceeds the first predetermined temperature (TO1) or the second predetermined temperature (TO2), the compressor 1 and the indoor fan motor run at low speed, and the outdoor fan motor runs at medium speed.

[0133] Table 1

[0134]

[0135] Table 2

[0136]

[0137] It can be understood that the specific values of the speed of the compressor 1 and the indoor fan motor are determined according to the real-time outdoor temperature, and the load of the air conditioner can be further adjusted according to the actual environment of the air conditioner to further maintain the real-time indoor temperature at the target indoor temperature.

[0138] When operating in reheat dehumidification mode, the controller switches the air conditioner to cooling mode when it detects the indoor temperature has risen above a certain level. When the indoor temperature has fallen below a certain level, it switches to heating mode. However, switching from reheat dehumidification mode to cooling or heating mode involves the temporary cessation of compressor 1 during the mode transition and the inability to perform dehumidification during heating operation, resulting in reduced dehumidification efficiency and reduced comfort. To prevent frequent switching between cooling and heating modes, the controller adjusts the speed of the outdoor fan motor based on the temperature difference between the indoor temperature and the set point, thereby regulating the heating capacity of the reheat stage of the indoor heat exchanger 5 to keep the indoor temperature close to the set point. However, changes in the outdoor fan motor speed are difficult to track with changes in indoor temperature, requiring considerable time. Furthermore, the indoor temperature can fluctuate unexpectedly due to external factors such as room ventilation and sunlight. Therefore, relying solely on indoor temperature as the control variable for the number of rotations of the outdoor fan motor is insufficient.

[0139] For an air conditioner with a certain air output, the variables that affect the air outlet temperature include the speed of the indoor fan motor and the corresponding changes in heat exchange intensity, as well as the inlet air temperature of the indoor fan motor. The speed and inlet air temperature of the indoor fan motor can be detected by sensors, so only the change in heat exchange intensity remains. Therefore, a corresponding relationship between heat exchange intensity and air outlet temperature can be established, and the air outlet temperature of the indoor fan motor can be calculated using this corresponding relationship. The heat exchange intensity is mainly affected by the condenser temperature and the evaporator temperature.

[0140] Therefore, in some embodiments, Figure 8 As shown, the controller is further configured to perform the following steps:

[0141] Step S104, when the air conditioner is operating in the reheat dehumidification mode, obtaining the condenser temperature collected by the third temperature sensor and the evaporator temperature collected by the fourth temperature sensor;

[0142] Step S105: adjusting the speed of the outdoor fan motor according to the condenser temperature and the evaporator temperature.

[0143] Among them, the third temperature sensor is set on the heat transfer pipe of the outdoor heat exchanger 3, and is used to detect the temperature on the heat transfer pipe of the outdoor heat exchanger 3; the fourth temperature sensor is set on the heat transfer pipe of the indoor heat exchanger 5, and is used to detect the temperature on the heat transfer pipe of the indoor heat exchanger 5.

[0144] In some embodiments, the third temperature sensor can be set at any position between the middle position and the outlet position of the outdoor heat exchanger 3. The middle position A and the outlet position B of the outdoor heat exchanger 3 are as follows: Figure 9As shown, the accuracy of the condenser temperature obtained when the air conditioner performs the reheat dehumidification mode can be improved. The specific position is set by those skilled in the art according to actual conditions, and the embodiments of this application are not limited thereto.

[0145] In some embodiments, the fourth temperature sensor can be set at any position between the inlet position and the middle position of the dehumidification section flow path of the indoor heat exchanger 5, and the inlet position C and the middle position D of the dehumidification section flow path are as follows: Figure 9 As shown, the accuracy of the evaporator temperature obtained when the air conditioner performs the reheat dehumidification mode can be improved. The specific position is set by those skilled in the art according to actual conditions, and the embodiments of this application are not limited thereto.

[0146] It is understandable that since the indoor temperature is affected by the condenser temperature and the evaporator temperature, the indoor temperature is calculated based on the condenser temperature and the evaporator temperature, and the speed of the outdoor fan motor is adjusted accordingly. This can improve the adjustment responsiveness of the outdoor fan motor and achieve more precise control of the indoor temperature.

[0147] In some embodiments, when adjusting the speed of the outdoor fan motor according to the condenser temperature and the evaporator temperature, the condenser temperature and the evaporator temperature need to be considered synchronously at this time, so the correspondence between the condenser temperature, the evaporator temperature and the speed of the outdoor fan motor can be established in advance, so that the target speed of the outdoor fan motor can be determined by the real-time condenser temperature and the real-time evaporator temperature detected at the current moment.

[0148] Among them, the correspondence between the condenser temperature, evaporator temperature and the speed of the outdoor fan motor can be obtained by technical personnel in this field based on the historical data when the air conditioner is operating in the actual reheat dehumidification mode. The historical data includes the condenser temperature, evaporator temperature and the speed of the outdoor fan motor in the historical time period.

[0149] In other embodiments, in order to ensure that the temperature value calculated based on the condenser temperature and the evaporator temperature can meet the condition that the indoor blow-out temperature is equal to the target indoor temperature, the controller can first perform calculations between the real-time condenser temperature and the real-time evaporator temperature to obtain the corresponding real-time comprehensive temperature, and then obtain the target speed of the outdoor fan motor at the current moment based on the correspondence between the comprehensive temperature and the speed of the outdoor fan motor, as well as the real-time comprehensive temperature.

[0150] In some embodiments, in order to reduce the amount of calculation required by technicians when calculating the correspondence between the comprehensive temperature and the speed of the outdoor fan motor, the controller can set a default speed of the outdoor fan motor and obtain the target comprehensive temperature corresponding to the default speed, and further determine whether to increase or decrease the speed of the outdoor fan motor based on the difference between the real-time comprehensive temperature and the target comprehensive temperature.

[0151] When the air conditioner executes the reheat dehumidification mode, the air conditioner needs to ensure that the outlet temperature of the indoor fan motor is consistent with the target indoor temperature, so the above-mentioned target comprehensive temperature needs to meet the condition that the temperature value at the first air outlet of the indoor fan motor is equal to the target indoor temperature. Therefore, when calculating the target comprehensive temperature, it is necessary to consider the difference between the actual temperature at the air outlet of the indoor fan motor of the air conditioner and the target indoor temperature when the reheat dehumidification mode is actually executed.

[0152] Therefore, in some embodiments, taking the comprehensive temperature as the average temperature between the condenser temperature and the evaporator temperature as an example, the controller may adjust the speed of the outdoor fan motor according to the condenser temperature and the evaporator temperature, which may include:

[0153] The controller obtains the real-time average temperature between the condenser temperature and the evaporator temperature;

[0154] The controller determines a target average temperature corresponding to the target indoor temperature based on a correspondence between a preset indoor temperature and an average temperature and a target indoor temperature;

[0155] The controller adjusts the speed of the outdoor fan motor according to the difference between the real-time average temperature and the target average temperature.

[0156] For example, Figure 10 As shown, the controller can perform the following steps:

[0157] 1. Calculate the average temperature T_ave of the condenser temperature TC and the evaporator temperature TE.

[0158] 2. Calculate the target average temperature ts_ave based on the correspondence between the target indoor temperature TS, the preset indoor temperature, and the average temperature.

[0159] 3. Calculate the difference ΔT_ave between the average temperature T_ave and the target average temperature TS_ave.

[0160] 4. When ΔT_ave is greater than the first temperature threshold T1, the controller controls to increase the speed of the outdoor fan motor; when ΔT_ave is less than or equal to the first temperature threshold T1 and greater than or equal to the second temperature threshold T2, the controller controls to maintain the speed of the outdoor fan motor; and when none of the above is true, it means that ΔT_ave is greater than the second temperature threshold T2, and at this time the controller controls to reduce the speed of the outdoor fan motor.

[0161] It is understandable that when the indoor temperature is represented by the real-time average temperature between the condenser temperature and the evaporator temperature, the target indoor temperature also needs to be represented by the average temperature between the condenser temperature and the evaporator temperature, so that the speed of the outdoor fan motor can be adjusted according to the real-time average temperature, thereby improving the adjustment responsiveness of the outdoor fan motor.

[0162] In some embodiments, the correspondence between the preset indoor temperature and the average temperature may be a functional relationship between the indoor temperature and the average temperature, and the functional relationship may be a linear function (y=ax+b) or a quadratic function (y=ax 2 +b), which is specifically configured by those skilled in the art according to actual conditions, and is not limited in the embodiments of the present application.

[0163] In actual calculation, since the values of constants a and b will change with the different structures of the air path between the indoor heat exchanger 5 and the indoor fan 6, data measurement is required during actual operation to determine the constants a and b.

[0164] In some embodiments, taking the functional relationship as a linear function as an example, the calculation process of the constants a and b may include:

[0165] 1. Under various constant temperature and humidity conditions, perform reheat dehumidification operation when the indoor outlet temperature is equal to the set temperature to obtain the indoor outlet temperature, condenser temperature and evaporator temperature when the air conditioner is in a stable operating state.

[0166] 2. Set the measured indoor air outlet temperature as the explanatory variable (x-axis) and the average temperature of the condenser temperature and the evaporator temperature as the target variable (y-axis), perform regression analysis, and determine the constants a and b from the obtained regression equation.

[0167] The average temperature calculated using the constants a and b is the average temperature that satisfies the condition that the indoor air outlet temperature ≈ the set temperature, i.e., the average temperature in the corresponding relationship. Therefore, the target average temperature calculated using the constants a and b and the average temperature between the condenser and evaporator temperatures is the average temperature between the condenser and evaporator temperatures that satisfies the condition that the indoor air outlet temperature is equal to the target indoor temperature.

[0168] In some embodiments, a third temperature sensor can be set at the first air outlet of the air conditioner, and the third temperature sensor is connected to the controller to obtain the indoor blowing temperature at the first air outlet through the third temperature sensor, so as to determine whether the condition that the indoor blowing temperature is equal to the set temperature is met at this time, and when the condition that the indoor blowing temperature is equal to the set temperature is met, the correspondence between the indoor temperature and the average temperature, that is, the constants a, b, is calculated.

[0169] In some embodiments, the third temperature sensor may be detachably disposed at the first air outlet, so that after calculating the correspondence between the indoor temperature and the average temperature, a person skilled in the art may remove the third temperature sensor to save internal space of the air conditioner.

[0170] It can be understood that when establishing the correspondence between the indoor temperature and the average temperature, directly associating the average temperature between the condenser temperature and the evaporator temperature, and the corresponding target indoor temperature when the temperature value at the first air outlet is equal to the target indoor temperature can save the calculation process of the controller.

[0171] During the actual execution of the reheat dehumidification mode, the appropriate operating mode is selected from reheat dehumidification isothermal operation, reheat dehumidification cooling operation, and reheat dehumidification heating operation based on the target temperature difference (the target temperature difference is the difference between the real-time indoor temperature detected by the first temperature sensor and the target indoor temperature) and the real-time outdoor temperature detected by the second temperature sensor. Therefore, the accuracy of the indoor temperature detected by the first temperature sensor and the outdoor temperature detected by the second temperature sensor are particularly critical. However, due to environmental factors such as the previous operating status and sunlight, the indoor temperature detected by the first temperature sensor and the outdoor temperature detected by the second temperature sensor before the air conditioner begins reheat dehumidification operation may deviate from the actual indoor temperature and outdoor temperature.

[0172] Therefore, in some embodiments, Figure 1 As shown, the controller is further configured to perform the following steps:

[0173] Step S106 , before the air conditioner operates in the reheat dehumidification mode, controlling the target motor to operate, the target motor including the indoor fan motor and / or the outdoor fan motor.

[0174] In some embodiments, the trigger condition for the air conditioner to operate in the reheat dehumidification mode may be receiving a control instruction, which is used to instruct the air conditioner to execute the reheat dehumidification mode. The control instruction may be received by a remote control and generated and output to the air conditioner in response to the user triggering a mode selection button on the remote control.

[0175] In some embodiments, the trigger condition for the controller to control the operation of the target motor may be receiving a control instruction, which is used to instruct the air conditioner to execute the reheat dehumidification mode, or it may be periodic operation before the air conditioner operates in the reheat dehumidification mode. The specific setting is made by those skilled in the art according to actual conditions, and is not limited by the embodiments of the present application.

[0176] For example, Figure 12 As shown, when the controller receives a control instruction, it controls the indoor fan motor and / or the outdoor fan motor to run for a period of time. After the operation of the indoor fan motor and / or the outdoor fan motor ends, the controller selects an appropriate operation mode from reheat dehumidification isothermal operation, reheat dehumidification cooling operation and reheat dehumidification heating operation according to the difference between the indoor temperature detected by the first temperature sensor and the target indoor temperature and the outdoor temperature detected by the second temperature sensor.

[0177] It is understandable that before the air conditioner operates in the reheat dehumidification mode, the target motor is controlled to run for a period of time to circulate the air inside the air conditioner, ensure that the indoor temperature detected by the air conditioner is equal to the actual temperature, and improve the detection accuracy of the indoor temperature.

[0178] It should be noted that the above-mentioned target motor can be an indoor fan motor, an outdoor fan motor, or both an indoor fan motor and an outdoor fan motor. The specific setting will be made by those skilled in the art according to actual conditions, so that the air at the first temperature sensor can be circulated. This embodiment does not impose any restrictions.

[0179] Usually, after the controller controls the compressor 1 to switch from the working state to the non-working state, some residual heat will be reserved inside the air conditioner. If the indoor fan motor and / or the outdoor fan motor are not working at this time, then this part of the residual heat will be retained around the first temperature sensor and cause the first temperature sensor to detect incorrectly, affecting the operating effect of the air conditioner in executing the next operating mode.

[0180] Therefore, in some embodiments, after the controller controls the compressor 1 to switch from the working state to the non-working state and before re-entering the working state, the controller controls the target motor to operate.

[0181] The situations that cause the controller to control the compressor 1 to switch from the working state to the non-working state may include:

[0182] 1. Overload protection. The protector inside the air conditioner detects whether compressor 1 is overloaded by monitoring its output current. When the current exceeds the set threshold, the protector immediately cuts off the power supply or issues an alarm signal, stopping compressor 1 and protecting it from damage.

[0183] 2. Overheat protection. The overheat protector inside the air conditioner detects whether there is overheating by monitoring the temperature of compressor 1. If the temperature exceeds the set safety threshold, the protector will take appropriate measures, such as interrupting the power supply or controlling compressor 1 to reduce the output current to cool compressor 1 and prevent further temperature increase.

[0184] 3. End of operation mode: After the last operation mode of the air conditioner ends, the compressor 1 will also be in a stopped state for a period of time.

[0185] Among them, the control command issued by the remote control can be received when the compressor 1 is in a non-working state, or it can be received before the compressor 1 switches from the working state to the non-working state. The specific setting is made by technical personnel in this field according to actual conditions, and the embodiments of this application are not limited.

[0186] For example, Figure 13 As shown, when the upper portion of the indoor unit is located close to the ceiling and the previous operating mode was heating, the air temperature above the indoor unit is higher than the actual room temperature due to the influence of condensation heat from the previous operation. This trapped air causes the temperature detected by the first temperature sensor to be higher than the actual room temperature. However, by implementing the solution of this embodiment, i.e., after the indoor fan motor has run for a certain period of time, the trapped air is circulated, and the indoor temperature detected by the first temperature sensor can be consistent with the actual room temperature.

[0187] For example, Figure 14 As shown, in the configuration where the back of the outdoor unit is close to a wall and the top of the outdoor unit is blocked, if the previous operating mode was cooling, the air temperature at the back of the outdoor unit is higher than the actual outside air temperature due to the influence of condensation heat from the previous operation. Due to stagnant air, the temperature detected by the second temperature sensor is higher than the actual outdoor temperature. However, by implementing the solution of this embodiment, i.e., after the outdoor fan motor has run for a certain period of time, the stagnant air circulates, and the outdoor temperature detected by the second temperature sensor can be the same as the actual outdoor air temperature.

[0188] In some embodiments, the control instruction for the above-mentioned controller to control the air conditioner to operate in the reheat dehumidification mode can be sent through the remote control during the period between the end of the last operation and the subsequent protection stop of the compressor 1, and during the period from the receipt of the control instruction to the end of the protection stop of the compressor 1, the controller controls the operation of the indoor fan and the outdoor fan.

[0189] For example, Figure 15As shown, after the air conditioner finishes the last operation and controls the compressor 1 to be in a protective stop state, the remote control sends a control instruction to the air conditioner to instruct the air conditioner to run the reheat dehumidification mode. After receiving the control instruction, the controller controls the indoor fan motor and the outdoor fan motor to run for a period of time. After the running time of the indoor fan motor and the outdoor fan motor ends, the controller controls the compressor 1 to be in working state again and starts to execute the judgment of the reheat dehumidification mode.

[0190] It is understandable that when the controller controls the target motor to operate, ensuring that the compressor 1 is in a stopped state can ensure that after the air inside the air conditioner circulates through the target motor, no excess hot air will remain inside the air conditioner.

[0191] It should be understood that although Figure 4-Figure 15 The steps in the flowchart are shown in the order indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 4-Figure 15 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0192] It should be understood that in various embodiments of the present application, the size of the sequence number of each process in the above flowchart does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. The above sequence numbers of the embodiment of the present application are only for description and do not represent the advantages and disadvantages of the embodiment. The above description of each embodiment tends to emphasize the differences between the various embodiments, and the same or similar aspects can refer to each other. For the sake of brevity, this article will not go into details.

[0193] The term "and / or" in this article is only a description of the association relationship between associated objects, indicating that there can be three relationships. For example, object A and / or object B can mean: object A exists alone, object A and object B exist at the same time, and object B exists alone.

[0194] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0195] Those skilled in the art will understand that all or part of the steps of implementing the above-mentioned method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM), magnetic disks or optical disks, and other media that can store program codes.

[0196] The above is merely an embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An air conditioner, characterized in that: The air conditioner comprises: a compressor configured to output refrigerant; an indoor heat exchanger connected to the compressor and configured to exchange heat with indoor air through the refrigerant; an outdoor heat exchanger connected to the compressor and configured to exchange heat with outdoor air through the refrigerant; a control valve group, comprising a first control valve, a second control valve, and a third control valve, wherein the first control valve is disposed in a refrigerant flow path of the indoor heat exchanger, a first end of the second control valve is connected to the indoor heat exchanger, a second end of the second control valve is connected to the outdoor heat exchanger, and the third control valve is disposed between the compressor, the indoor heat exchanger, and the outdoor heat exchanger; an indoor fan, comprising an indoor fan motor, configured to rotate under the drive of the indoor fan motor to send the indoor air out of the air conditioner after passing through the indoor heat exchanger; an outdoor fan, comprising an outdoor fan motor, configured to rotate under the drive of the outdoor fan motor to send the outdoor air out of the air conditioner after passing through the outdoor heat exchanger; a first temperature sensor configured to detect indoor temperature; a controller, connected to the compressor, the indoor fan motor, and the outdoor fan motor, respectively, and configured to control the operating frequency of the compressor and the speed of a target motor, the target motor including the indoor fan motor and / or the outdoor fan motor; The controller is connected to the control valve group and is configured to control the openings of the first control valve, the second control valve, and the third control valve to operate the air conditioner in a cooling mode, a heating mode, or a reheat dehumidification mode; The controller is further configured to: When the air conditioner operates in the reheat dehumidification mode, obtaining the real-time indoor temperature through the first temperature sensor; Determining a target operating state of the air conditioner based on a correspondence between a preset temperature difference and an operating state, and a temperature difference between the real-time indoor temperature and a target indoor temperature, wherein the target operating state includes a reheat dehumidification cooling state, a reheat dehumidification isothermal state, or a reheat dehumidification heating state; The air conditioner is controlled to operate in the target operating state, where different target operating states correspond to operating parameters with different values, and the operating parameters include part or all of the speed of the outdoor fan motor, the speed of the indoor fan motor, and the speed of the compressor.

2. The air conditioner according to claim 1, wherein The value of the target operating parameter in the reheat dehumidification cooling state is higher than the value of the target operating parameter in the reheat dehumidification isothermal state, and / or the value of the target operating parameter in the reheat dehumidification heating state is higher than the value of the target operating parameter in the reheat dehumidification isothermal state, and the target operating parameters include the speed of the indoor fan motor and / or the speed of the compressor.

3. The air conditioner according to claim 2, wherein: The air conditioner includes at least two operation cycles, and the controller is further configured to: When the target operating state in the previous operating cycle is the reheat dehumidification isothermal state and the target operating state in the current operating cycle is the target dehumidification state, the compressor is controlled to increase the speed, and the indoor fan motor is controlled to increase the speed. The target dehumidification state includes the reheat dehumidification cooling state or the reheat dehumidification heating state.

4. The air conditioner according to claim 3, wherein: The start time of increasing the rotation speed of the compressor is different from the start time of increasing the rotation speed of the indoor fan motor.

5. The air conditioner according to claim 2, wherein: The air conditioner further includes a second temperature sensor for detecting outdoor temperature. The controller is further configured to: obtaining the real-time outdoor temperature through the second temperature sensor; Determining a target value of a target operating parameter under the target operating state according to the real-time outdoor temperature; According to the target value of the target operating parameter, the target device is controlled to operate, and the target device includes the indoor fan motor and / or the compressor.

6. The air conditioner according to any one of claims 1 to 5, characterized in that: The air conditioner further includes a third temperature sensor provided on the heat transfer tube of the outdoor heat exchanger, and a fourth temperature sensor provided on the heat transfer tube of the indoor heat exchanger, and the controller is further configured to: When the air conditioner is operating in a reheat dehumidification mode, obtaining a condenser temperature collected by the third temperature sensor and an evaporator temperature collected by the fourth temperature sensor; The rotation speed of the outdoor fan motor is adjusted according to the condenser temperature and the evaporator temperature.

7. The air conditioner according to claim 6, wherein: The controller adjusts the rotation speed of the outdoor fan motor according to the condenser temperature and the evaporator temperature, including: The controller obtains a real-time average temperature between the condenser temperature and the evaporator temperature; The controller determines a target average temperature corresponding to the target indoor temperature according to a correspondence between a preset indoor temperature and an average temperature and the target indoor temperature; The controller adjusts the rotation speed of the outdoor fan motor according to the difference between the real-time average temperature and the target average temperature.

8. The air conditioner according to claim 7, wherein: The average temperature in the corresponding relationship is the average temperature between the condenser temperature and the evaporator temperature when the temperature value at the first air outlet is equal to the target indoor temperature. The first air outlet is the opening on the air conditioner casing corresponding to the indoor fan position.

9. The air conditioner according to any one of claims 1 to 5, characterized in that: The controller is further configured to: Before the air conditioner operates in the reheat dehumidification mode, a target motor is controlled to operate, and the target motor includes the indoor fan motor and / or the outdoor fan motor.

10. The air conditioner according to claim 9, wherein After the controller controls the compressor to switch from the operating state to the non-operating state and before re-entering the operating state, the controller controls the target motor to operate.

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