Air conditioner

Abstract

The air conditioner comprises a controller configured to: after receiving a dehumidification instruction, acquire a set temperature Ts; determine a set relative humidity; when the set temperature difference is greater than 0, start a compressor and rotate an indoor fan, and after the compressor operates for a second preset time, determine an indoor fan rotating speed, specifically: calculate a current dew point temperature and a target dew point temperature; determine the indoor fan calculated rotating speed according to the difference between the current dew point temperature and the target dew point temperature; determine the indoor fan minimum rotating speed according to the current compressor frequency; when the indoor fan calculated rotating speed is greater than or equal to the indoor fan minimum rotating speed, the indoor fan rotating speed of the current period is the indoor fan calculated rotating speed, and when the indoor fan calculated rotating speed is less than the indoor fan minimum rotating speed, the indoor fan rotating speed of the current period is the indoor fan minimum rotating speed, so that the coupling of the minimum rotating speed of the indoor motor and the compressor frequency can be realized, and the actual dehumidification amount can be maximized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner. BACKGROUND

[0002] In the rainy season or in coastal areas such as Qingdao, the room temperature is suitable, but the relative humidity is high, and the relative humidity can be close to 100%. The user feels cold, and the room items, especially textiles, are damp. The wall even seeps water. At this time, the room has low cooling load (the cooling load demand is very low or even 0W, and the room temperature drop demand is very small, or even no need to cool), and high humidity load (the room needs dehumidification, and dehumidification is the user's main complaint). A split air conditioner includes an air conditioner indoor unit and an air conditioner outdoor unit. The air conditioner indoor unit includes an indoor heat exchanger, an indoor fan, and an indoor air deflector. The air conditioner outdoor unit includes a compressor and an outdoor fan.

[0003] The conventional air conditioner has a dehumidification valve (the dehumidification valve divides the indoor heat exchanger into two parts, the first half is for condensation and temperature rise, and the second half is for evaporation and temperature drop and dehumidification. The sensible heat and latent heat offset, which is equivalent to the actual temperature not decreasing, but dehumidification), that is, it cannot dehumidify without cooling. Therefore, the conventional air conditioner needs to cool to dehumidify. However, the room has low cooling load, so the room temperature is suitable at this time, and almost no cooling is needed. The compressor must run at a low frequency when dehumidifying. At this time, the evaporation temperature is higher than the dew point temperature, so dehumidification cannot be achieved. Or, the room temperature is set to a lower temperature to effectively dehumidify, but the room temperature is low, the room is cold, and the user feels uncomfortable. For example, when the room temperature is low, such as 22℃, and the outdoor environment temperature is low, such as 23℃, in order to dehumidify, the room temperature is set to 21℃ or below. At this time, the room cooling load is only tens of watts or even 0W. Even if the compressor runs at a low frequency, such as 10Hz, and the indoor fan motor runs at the lowest allowable reliable speed, such as 300rpm, the output capacity of the air conditioner at this time is more than 500W, which is much larger than the room cooling load. The room temperature still drops significantly.

[0004] In the prior art, in the weather with low cooling load and high humidity load, when the room temperature is set to be suitable, the evaporation temperature is reduced purely relying on the fan motor speed to achieve a certain dehumidification. However, in many working conditions, this method has certain limitations. Reducing the evaporation temperature easily triggers the freeze protection parameter protection and reduces the frequency (the freeze protection parameter does not change with the room temperature, but is a fixed value). This forms a contradictory situation of increasing the frequency and reducing the frequency, and still cannot effectively dehumidify. Therefore, the present application proposes an air conditioner. SUMMARY

[0005] The present application aims to at least solve one of the problems in the related art to some extent.

[0006] To this end, according to an embodiment of the present disclosure, an air conditioner is provided, comprising:

[0007] An indoor machine shell is provided with an indoor air inlet;

[0008] An indoor fan is arranged in the indoor machine shell;

[0009] An outdoor machine shell is provided with an outdoor air inlet;

[0010] A compressor is arranged in the outdoor machine shell;

[0011] An outdoor ambient temperature detection device is used to detect the outdoor ambient temperature, and the outdoor ambient temperature detection device is connected with the outdoor machine shell and located at the outdoor air inlet;

[0012] An indoor ambient detection device is used to detect the indoor ambient temperature and the indoor ambient relative humidity, and the indoor ambient detection device is connected with the indoor machine shell and located at the indoor air inlet;

[0013] A controller is configured to:

[0014] After receiving a dehumidification instruction,

[0015] Obtain a set temperature Ts;

[0016] Obtain a current indoor ambient temperature Ta(n), a current indoor ambient relative humidity RH(n), and a current outdoor ambient temperature Tout(n);

[0017] Determine a set relative humidity RHs according to the current outdoor ambient temperature Tout(n) and the current indoor ambient relative humidity RH(n);

[0018] Calculate a set temperature difference E(n), which is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts;

[0019] When the set temperature difference E(n) is greater than 0, control the compressor to start and the indoor fan to rotate, the compressor runs at an initial frequency F(0), and the indoor fan runs at an initial rotating speed R(0);

[0020] After the compressor runs at the initial frequency for a second preset time t2, periodically determine the rotating speed R(n) of the indoor fan, and the indoor fan runs at the indoor fan rotating speed R(n) determined in the current period, and the periodically determining the rotating speed R(n) of the indoor fan is specifically:

[0021] Obtain a current compressor frequency F(n), a current indoor ambient temperature Ta(n), and a current indoor ambient humidity RH(n);

[0022] Calculate a current dew point temperature TL(n) according to the current indoor ambient temperature Ta(n) and the current indoor ambient relative humidity RH(n);

[0023] calculating a target dew point temperature TLs according to the set temperature Ts and the set relative humidity RHs;

[0024] determining the indoor fan calculation rotating speed R according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs 计 ;

[0025] determining the indoor fan minimum rotating speed Rmin according to the current compressor frequency F(n);

[0026] when the indoor fan calculation rotating speed is greater than or equal to the indoor fan minimum rotating speed, the current period indoor fan rotating speed R(n) is the indoor fan calculation rotating speed R 计 , and when the indoor fan calculation rotating speed is less than the indoor fan minimum rotating speed, the current period indoor fan rotating speed R(n) is the indoor fan minimum rotating speed Rmin.

[0027] In the present application, the set relative humidity RHs is determined according to the current outdoor environment temperature Tout(n) and the current indoor environment relative humidity RH(n), so that the dehumidification of the air conditioner is adapted to the environment, avoiding that the set relative humidity is set too small in a high humidity area, so that the dehumidification is difficult to achieve, so that the set relative humidity can be achieved while ensuring user comfort, ensuring the normal operation of the air conditioner; the indoor fan calculation rotating speed is determined according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs, which can realize the control of humidity; the minimum value of the indoor fan rotating speed is controlled according to the compressor frequency, which can realize the coupling of the minimum rotating speed of the indoor motor and the compressor frequency, can maximize the actual dehumidification amount, avoid independent control of the compressor rotating speed, avoid that the actual dehumidification amount is not maximized, thereby affecting the reduction of room humidity.

[0028] According to the embodiments of the present disclosure, the calculation of the indoor fan rotating speed according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs is specifically:

[0029] when TL(n)-TLs>1.0, R 计 =R(n-1)-R;

[0030] when TL(n)-TLs<-1.0, R 计 =R(n-1)+R;

[0031] when -1.0≤TL(n)-TLs≤1.0, R 计 =R(n-1);

[0032] wherein, R 计 is the indoor fan calculation rotating speed, R(n-1) is the last determined indoor fan rotating speed, and R is the first preset rotating speed.

[0033] The difference between the current dew point temperature TL(n) and the target dew point temperature TLs is used to determine the calculation rotating speed of the indoor fan, which can determine the decrease, maintenance and increase of the rotating speed of the indoor fan according to the current dehumidification demand, so as to enhance, maintain or reduce the dehumidification capacity, and make the dehumidification meet the needs, and ensure the comfort of the user.

[0034] According to the embodiment of the present disclosure, the minimum rotating speed Rmin of the indoor fan is determined according to the current compressor frequency F(n), and specifically:

[0035] When F(n)=Fmin, Rmin=R dm ;

[0036] When Fmin<F(n)≤F1, Rmin=R dm +(R L -R dm ) / (F1-Fmin)*(F-Fmin);

[0037] When F(n)>F1, Rmin=R L ;

[0038] Wherein, F(n) is the current compressor frequency, F1 is the first preset threshold of the compressor frequency, Fmin is the minimum frequency of the compressor, Fmin<F1; R dm is the reliable minimum rotating speed of the indoor fan, R L is the low rotating speed of the indoor fan.

[0039] The coupling control of the compressor frequency F(n) and the minimum rotating speed Rmin of the indoor motor is set, which can prevent the temperature and humidity from being controlled respectively, prevent the compressor frequency and the rotating speed of the indoor motor from being controlled independently, avoid the actual dehumidification capacity from not being maximized, and further avoid affecting the reduction of the room humidity.

[0040] According to the embodiment of the present disclosure, further comprising:

[0041] The indoor heat exchanger is arranged in the indoor machine shell and located on the side of the indoor fan close to the indoor air inlet;

[0042] The electric heating device is arranged in the indoor machine shell and located between the indoor heat exchanger and the indoor fan;

[0043] The controller is configured to:

[0044] After receiving the dehumidification instruction, the indoor environment temperature Ta(n) and the indoor environment relative humidity RH(n) are detected in real time, and the electric heating device is turned on when the electric heating device meets the opening condition of the electric heating device, the opening condition of the electric heating device being that the set temperature difference E(n) is less than or equal to a first preset set temperature difference E1, and the real-time detected indoor environment relative humidity RH(n) is greater than or equal to a set humidity RHs plus a third preset humidity RH3.

[0045] The set temperature difference E(n) is the difference between the real-time detected indoor environment temperature Ta(n) and the set temperature Ts.

[0046] According to an embodiment of the present disclosure, the controller is configured to:

[0047] After the electric heating device is turned on for at least a fourth preset time, the indoor environment temperature Ta(n) and the indoor environment relative humidity RH(n) are detected in real time, and the electric heating device is turned off when the electric heating device meets the closing condition of the electric heating device, the closing condition of the electric heating device being that the set temperature difference E(n) is greater than a second preset set temperature difference E2, or the real-time detected indoor environment relative humidity RH(n) is less than the set relative humidity RHs.

[0048] The set temperature difference E(n) is the difference between the real-time detected indoor environment temperature Ta(n) and the set temperature Ts.

[0049] The set temperature difference E(n) is the difference between the real-time detected indoor environment temperature Ta(n) and the set temperature Ts.

[0050] The setting of the electric heating device to be turned on can offset the sensible cooling capacity, so that the room temperature does not decrease or slightly decreases, realizes intermittent operation of the electric heating device, can inhibit the electric heating operation power consumption, and saves energy.

[0051] According to an embodiment of the present disclosure, the controller is configured to:

[0052] After the compressor is operated at the initial frequency for a second preset time t2, the frequency of the compressor is periodically determined, and in each compressor frequency determination period, the current compressor frequency F(n) of the period is F(n-1)+dF, where F(n-1) is the last compressor frequency and dF is the compressor frequency change amount of the period.

[0053] After the current compressor frequency of the period is determined, the compressor is operated at the current compressor frequency of the period.

[0054] According to an embodiment of the present disclosure, the current compressor frequency change amount dF is determined according to the current set temperature difference E(n) and the current set temperature difference change rate ΔE of the period.

[0055] The current set temperature difference E(n) is the difference between the current indoor environment temperature Ta(n) and the set temperature Ts.

[0056] The current period setting temperature difference change rate ΔE(n) = last period setting temperature difference E(n-1) - current period setting temperature difference E(n).

[0057] According to an embodiment of the present disclosure, the setting relative humidity RHs corresponding to the current outdoor environment temperature Tout(n) and the current indoor environment relative humidity RH(n) is determined according to a pre-set two-dimensional data set.

[0058] According to an embodiment of the present disclosure, the air conditioner further comprises:

[0059] An electric heating indicator light or icon;

[0060] When dehumidifying, the electric heating indicator light or icon on the display is not lit after the electric heating device is turned on.

[0061] According to an embodiment of the present disclosure, an air conditioner is further provided, comprising:

[0062] An indoor unit shell, which is provided with an indoor air inlet;

[0063] An indoor fan, which is arranged in the indoor unit shell;

[0064] An outdoor unit shell, which is provided with an outdoor air inlet;

[0065] A compressor, which is arranged in the outdoor unit shell;

[0066] An outdoor environment temperature detection device, which is used for detecting an outdoor environment temperature, and is connected with the outdoor unit shell and located at the outdoor air inlet;

[0067] An indoor environment detection device, which is used for detecting an indoor environment temperature and an indoor environment relative humidity, and is connected with the indoor unit shell and located at the indoor air inlet;

[0068] A controller, which is configured to:

[0069] After receiving a dehumidifying instruction,

[0070] Obtain a setting temperature Ts;

[0071] Obtain a current indoor environment temperature Ta(n), a current indoor environment relative humidity RH(n) and a current outdoor environment temperature Tout(n);

[0072] Determine a setting relative humidity RHs according to the current outdoor environment temperature Tout(n) and the current indoor environment relative humidity RH(n);

[0073] Calculate a setting temperature difference E(n), which is a difference between the current indoor environment temperature Ta(n) and the setting temperature Ts;

[0074] When the temperature difference E(n) is greater than 0, the compressor is started and the indoor fan is rotated, the compressor is operated at an initial frequency F(0), and the indoor fan is operated at an initial rotating speed R(0);

[0075] After the compressor is operated at the initial frequency for a second preset time t2, the rotating speed R(n) of the indoor fan is periodically determined, and the indoor fan is operated at the rotating speed R(n) determined in the current period, and the rotating speed R(n) of the indoor fan is periodically determined as follows:

[0076] The current compressor frequency F(n), the current indoor environment temperature Ta(n) and the current indoor environment humidity RH(n) are obtained;

[0077] The current dew point temperature TL(n) is calculated according to the current indoor environment temperature Ta(n) and the current indoor environment relative humidity RH(n);

[0078] The target dew point temperature TLs is calculated according to the set temperature Ts and the set relative humidity RHs;

[0079] The indoor fan calculation rotating speed R is determined according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs. 计 ;

[0080] The indoor fan minimum rotating speed Rmin is determined according to the current compressor frequency F(n);

[0081] When the indoor fan calculation rotating speed is greater than or equal to the indoor fan minimum rotating speed, the rotating speed R(n) of the indoor fan in the current period is the indoor fan calculation rotating speed R 计 , and when the indoor fan calculation rotating speed is less than the indoor fan minimum rotating speed, the rotating speed R(n) of the indoor fan in the current period is the indoor fan minimum rotating speed Rmin.

[0082] The initial rotating speed R(0) is greater than R dm , and R dm is the reliable minimum rotating speed of the indoor fan. BRIEF DESCRIPTION OF DRAWINGS

[0083] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0084] Figure 1 is a sectional view of an air conditioner according to the embodiment of the present application;

[0085] Figure 2is a part dehumidification flow chart of an air conditioner according to the embodiment of the application;

[0086] Figure 3 is a flow chart of indoor fan rotating speed determination according to the embodiment of the application;

[0087] Figure 4 is a flow chart of indoor fan calculated rotating speed determination according to the embodiment of the application;

[0088] Figure 5 is a flow chart of indoor fan minimum rotating speed determination according to the embodiment of the application;

[0089] Figure 6 is a part dehumidification flow chart of an air conditioner according to the embodiment of the application;

[0090] Figure 7 is a flow chart of Ts determination of an air conditioner according to the embodiment of the application;

[0091] Figure 8 is a flow chart of electric heating device opening of an air conditioner according to the embodiment of the application;

[0092] Figure 9 is a flow chart of electric heating device closing of an air conditioner according to the embodiment of the application;

[0093] Figure 10 is a flow chart of electric heating device closing and reopening cycle of an air conditioner according to the embodiment of the application.

[0094] In the above figures: air conditioner indoor unit 100; indoor unit shell 1; indoor air inlet 11; indoor air outlet 12; indoor air duct 13; indoor fan 21; indoor heat exchanger 22; indoor air deflector 23; electric heating device 31. DETAILED DESCRIPTION

[0095] Hereinafter, the application will be described in detail through exemplary embodiments. However, it should be understood that elements, structures and features in one embodiment can be beneficially combined with other embodiments without further recitations.

[0096] In the back-to-south days or plum rain days or coastal areas such as Qingdao, the room temperature is suitable, but the relative humidity is high, the relative humidity can be close to 100%, the user feels cold, the room articles, especially the textiles, are damp, and the walls even seep water, at this time, the room cold load is low (the cold load demand is very low or even 0W, the room temperature drop demand is very small, or even no need to drop temperature), and the wet load is high (the room needs dehumidification, and dehumidification is the user's main complaint).

[0097] The conventional air conditioner does not have a dehumidification valve (the dehumidification valve divides the indoor heat exchanger into two parts, the front part is used for condensation and temperature rise, and the rear part is used for evaporation and temperature drop and dehumidification, the sensible heat and latent heat offset, which is equivalent to the actual temperature not being reduced, but the dehumidification), that is, the conventional air conditioner cannot dehumidify without reducing the temperature, therefore, the conventional air conditioner needs to reduce the temperature to dehumidify, but when the cooling load in the room is low, the temperature in the room is suitable, and almost no temperature reduction is needed, when dehumidifying, the compressor must be operated at a low frequency, at this time, the evaporation temperature is higher than the dew point temperature, so dehumidification cannot be achieved, or a lower temperature is set to make the air conditioner effectively dehumidify, but the room temperature is low, the room is cold, and the user feels uncomfortable.

[0098] Therefore, the air conditioner is provided, and the air conditioner is described below with reference to the accompanying drawings. Figures 1-10 The air conditioner is described.

[0099] The air conditioner comprises an air conditioner indoor unit 100 and an air conditioner outdoor unit, and the air conditioner indoor unit and the air conditioner outdoor unit are connected.

[0100] The air conditioner indoor unit can be a wall-mounted air conditioner indoor unit or a cabinet-type air conditioner indoor unit.

[0101] Referring to Figure 1 , the air conditioner indoor unit comprises an indoor unit shell 1, and the indoor unit shell is provided with an indoor air inlet 11 and an indoor air outlet 12.

[0102] When the air conditioner indoor unit is wall-mounted, the height direction of the indoor unit shell is from the bottom end of the indoor unit shell to the top end of the indoor unit shell, the front-rear direction of the indoor unit shell is from the front side of the indoor unit shell to the rear side of the indoor unit shell, and the length direction of the indoor unit shell is from one side end of the indoor unit shell to the other side end of the indoor unit shell, wherein any two of the height direction, the front-rear direction and the length direction of the indoor unit shell are perpendicular.

[0103] When the air conditioner indoor unit is cabinet-type, the width direction of the indoor unit shell is from one side end of the indoor unit shell to the other side end of the indoor unit shell.

[0104] When the air conditioner indoor unit is wall-mounted, the indoor air inlet can be arranged at the top of the indoor unit shell, and the indoor air outlet can be arranged at the lower front of the indoor unit shell.

[0105] When the air conditioner indoor unit is cabinet-type, the indoor air inlet can be arranged at the rear of the indoor unit shell, and the indoor air outlet can be arranged at the front of the indoor unit shell.

[0106] The air conditioner indoor unit comprises an indoor air duct 13 formed in the air conditioner indoor unit, wherein the indoor air inlet and the indoor air outlet are in communication with the indoor air duct.

[0107] The air conditioner indoor unit further comprises an indoor fan 21 and an indoor heat exchanger 22.

[0108] The indoor heat exchanger is arranged in the indoor machine shell and located in the indoor air duct, and is arranged at the indoor air inlet and located on the inner side of the indoor air inlet. The indoor heat exchanger is used for heat exchange with the air entering the indoor air duct.

[0109] The indoor fan is arranged in the indoor machine shell and located in the indoor air duct, and is used for providing power for the flow of air. Under the driving of the indoor fan, the indoor air enters the indoor air duct through the indoor air inlet, the air entering the indoor air duct is heat-exchanged with the indoor heat exchanger at the indoor heat exchanger, and the heat-exchanged air flows out of the indoor air duct through the indoor air outlet.

[0110] The indoor heat exchanger is arranged on the side of the indoor fan close to the indoor air inlet.

[0111] The air conditioner outdoor unit comprises an outdoor machine shell, an outdoor air inlet and an outdoor air outlet are arranged on the outdoor machine shell, and an outdoor air duct is arranged in the outdoor machine shell. The outdoor air inlet and the outdoor air outlet are in communication with the outdoor air duct.

[0112] The air conditioner outdoor unit further comprises an outdoor fan and an outdoor heat exchanger.

[0113] The outdoor heat exchanger is arranged in the outdoor machine shell and located in the outdoor air duct, and is located at the outdoor air inlet and on the inner side of the outdoor air inlet. The outdoor heat exchanger is used for heat exchange with the air entering the outdoor air duct.

[0114] The outdoor fan is arranged in the outdoor machine shell and located in the outdoor air duct, and is used for providing power for the flow of air. Under the driving of the outdoor fan, the outdoor air enters the outdoor air duct through the outdoor air inlet, the air entering the outdoor air duct is heat-exchanged with the outdoor heat exchanger at the outdoor heat exchanger, and the heat-exchanged air flows out of the outdoor air duct through the outdoor air outlet.

[0115] The air conditioner further comprises a compressor and a throttling device. The compressor is arranged in the outdoor machine shell, and the compressor compresses the low-temperature and low-pressure state refrigerant gas to discharge high-temperature and high-pressure state refrigerant gas. The throttling device can be an expansion valve. The expansion valve expands the high-temperature and high-pressure state liquid phase refrigerant condensed in the condenser into low-pressure liquid phase refrigerant.

[0116] In the indoor heat exchanger and the outdoor heat exchanger, one of them is a condenser and the other is an evaporator. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process. The evaporator can achieve the refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled.

[0117] The air conditioner has a refrigerant circuit that connects a compressor, a condenser, an expansion valve and an evaporator in sequence to circulate refrigerant. The air conditioner includes a cooling mode and a heating mode, in the cooling mode, the indoor heat exchanger is an evaporator, the outdoor heat exchanger is a condenser, and the refrigerant circulates through the compressor, the outdoor heat exchanger, the expansion valve and the indoor heat exchanger in sequence; in the heating mode, the indoor heat exchanger is a condenser and the outdoor heat exchanger is an evaporator; the refrigerant circulates through the compressor, the indoor heat exchanger, the expansion valve and the outdoor heat exchanger in sequence.

[0118] The air conditioner further includes a four-way valve that changes the flow direction of the refrigerant to enable switching between the cooling cycle and the heating cycle. The expansion valve can be an electronic expansion valve.

[0119] The air conditioner indoor unit includes an indoor air deflector 23, wherein the indoor air deflector is used to guide the air from the indoor air outlet, and the indoor air deflector is connected with the indoor unit shell.

[0120] The indoor air deflector is rotatably connected with the indoor unit shell.

[0121] In some embodiments of the present application, the air conditioner includes an outdoor environment temperature detection device, wherein the outdoor environment temperature detection device is used to detect the outdoor environment temperature Tout, the outdoor environment temperature detection device is connected to the outdoor unit shell, and the outdoor environment temperature detection device is located at the outdoor air inlet.

[0122] In the present application, the outdoor environment temperature detection device is provided to obtain the outdoor environment temperature, which facilitates the air conditioner to perform some operations according to the outdoor environment temperature, and the outdoor environment temperature detection device is arranged at the outdoor air inlet, which can improve the detection accuracy. When the outdoor air inlet is in the air inlet state, the outdoor air will enter the outdoor unit shell through the outdoor air inlet, so that the air in the outdoor environment will flow, and the detected temperature can be more accurate.

[0123] The outdoor environment temperature detection device can be an indoor environment temperature sensor.

[0124] In some embodiments of the present application, the air conditioner further includes an indoor environment detection device, wherein the indoor environment detection device can be used to detect the indoor environment temperature Ta and the indoor environment relative humidity RH, the indoor environment detection device is connected to the indoor unit shell, and the indoor environment detection device is located at the indoor air inlet.

[0125] In the present application, the indoor environment detection device is arranged to detect the indoor environment temperature and the indoor environment relative humidity, so as to obtain the temperature parameter and the relative humidity parameter of the indoor environment, and the indoor environment detection device is arranged at the indoor air inlet, so that the detection accuracy is improved. When the indoor air enters the indoor machine shell through the indoor air inlet, indoor circulation is caused, so that the temperature and the relative humidity of the indoor environment can be detected more accurately.

[0126] The indoor environment detection device can be an indoor environment temperature and humidity sensor. Alternatively, the indoor environment detection device comprises an indoor environment temperature sensor and an indoor environment humidity sensor which are independent of each other.

[0127] In some embodiments of the present application, the air conditioner further comprises a controller. Specifically, the controller comprises at least one of a central processing unit (CPU), a video processor, an audio processor, a graphics processing unit (GPU), a RAM (Random Access Memory), a ROM (Read-Only Memory), a first interface to an n-th interface for input / output, a communication bus, and the like.

[0128] The controller controls the operation of the air conditioner and responds to the operation of the user through various software control programs stored on the memory, and controls the overall operation of the air conditioner. For example, in response to the received operation instruction for output, the controller can perform an operation related to the component selected by the operation instruction.

[0129] The controller is connected with the indoor fan, the outdoor fan, the compressor, the four-way valve, the expansion valve, the outdoor environment temperature detection device, and the indoor environment detection device. The controller can receive the parameter values detected by the outdoor environment temperature detection device and the indoor environment detection device, and control the working state of the indoor fan, the outdoor fan, and the compressor according to the logic set by itself, so that the air conditioner can work normally.

[0130] In some embodiments of the present application, with reference to Figures 2-3 , the controller is configured to:

[0131] After receiving the dehumidification instruction,

[0132] obtain the set temperature Ts;

[0133] obtain the current indoor environment temperature Ta(n), the current indoor environment relative humidity RH(n), and the current outdoor environment temperature Tout(n);

[0134] determining the set relative humidity RHs according to the current outdoor environment temperature Tout(n) and the current indoor environment relative humidity RH(n);

[0135] calculating the set temperature difference E(n), which is the difference between the current indoor environment temperature Ta(n) and the set temperature Ts;

[0136] when the set temperature difference E(n) is greater than 0, controlling the compressor to start and the indoor fan to rotate, the compressor operating at the initial frequency F(0) and the indoor fan operating at the initial rotating speed R(0);

[0137] after the compressor operates at the initial frequency for the second preset time t2, periodically determining the indoor fan rotating speed R(n), and the indoor fan operating at the indoor fan rotating speed R(n) determined in the current period, the periodically determining the indoor fan rotating speed R(n) being specifically:

[0138] obtaining the current compressor frequency F(n), the current indoor environment temperature Ta(n) and the current indoor environment humidity RH(n);

[0139] calculating the current dew point temperature TL(n) according to the current indoor environment temperature Ta(n) and the current indoor environment relative humidity RH(n);

[0140] calculating the target dew point temperature TLs according to the set temperature Ts and the set relative humidity RHs;

[0141] determining the indoor fan calculation rotating speed R 计 according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs;

[0142] determining the indoor fan minimum rotating speed Rmin according to the current compressor frequency F(n);

[0143] when the indoor fan calculation rotating speed is greater than or equal to the indoor fan minimum rotating speed, the indoor fan rotating speed R(n) in the current period is the indoor fan calculation rotating speed R 计 , and when the indoor fan calculation rotating speed is less than the indoor fan minimum rotating speed, the indoor fan rotating speed R(n) in the current period is the indoor fan minimum rotating speed Rmin.

[0144] wherein the initial frequency F(0) = F0, wherein Fmin≤F0≤Fmax, wherein Fmin is the minimum frequency of the compressor and Fmax is the maximum frequency of the compressor.

[0145] wherein the initial rotating speed R(0) = R L , wherein R dm < R L < R M < R H , wherein R dmR(0) = R L R(0) = R M R(0) = R H R(0) = R M R(0) = R H .

[0146] Wherein, the second preset time t2 can be 10 min.

[0147] Wherein, the current dew point temperature TL(n) = f(Ta(n), RH(n)).

[0148] The period of determining the indoor fan speed R(n) is the third preset time t3, wherein the indoor fan speed is calculated every third preset time. Wherein, the third preset time can be 5 min.

[0149] In the present application, the set relative humidity RHs is determined according to the current outdoor environment temperature Tout(n) and the current indoor environment relative humidity RH(n), so that the dehumidification of the air conditioner is adapted to the environment, avoiding that in high humidity areas the set relative humidity is set too small to make the dehumidification difficult to achieve, so that the set relative humidity can be achieved while ensuring user comfort, ensuring the normal operation of the air conditioner; the indoor fan calculation speed is determined according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs, which can realize the control of humidity; the minimum value of the indoor fan speed is controlled according to the compressor frequency, which can realize the coupling of the minimum speed of the indoor motor and the compressor frequency, can make the actual dehumidification capacity as large as possible, avoid independent control of the compressor speed, avoid the actual dehumidification capacity not being maximized, thereby affecting the reduction of room humidity.

[0150] In some embodiments of the present application, the set relative humidity RHs is determined according to the current outdoor environment temperature Tout(n) and the current indoor environment relative humidity RH(n).

[0151] Wherein, the current region can be determined according to the positioning, and the set relative humidity can be determined according to the current region and the current time.

[0152] Specifically, the region can be determined according to the cloud positioning, and the humidity level of the current region can be determined according to the current time, wherein the humidity level can be divided into high humidity, medium humidity and low humidity, and the current set relative humidity can be determined according to the humidity level.

[0153] The set relative humidity value in the high-humidity area is high, and can be 64% to 72%, and the preferred Rhs=68%; the set relative humidity value in the medium-humidity area is medium-high, and can be 56% to 64%, and the preferred Rhs=60%; and the set relative humidity value in the low-humidity area is medium, and can be 48% to 56%, and the limited Rhs=52%.

[0154] The set relative humidity RHs corresponding to the current outdoor environment temperature Tout(n) and the current indoor environment relative humidity RH(n) can also be determined according to the pre-set two-dimensional data set.

[0155] Specifically, according to the local weather forecast information or the offline detected environment parameters, the outdoor environment temperature is divided into m temperature intervals, and the indoor relative humidity is divided into n humidity intervals, to form an m*n two-dimensional data table, and the data in the two-dimensional table is the set relative humidity.

[0156] According to the size of the cooling load (i.e. the required sensible cooling amount) and the wet load (i.e. the required latent cooling amount), i set relative humidities are respectively assigned in the two-dimensional table, and the i set relative humidity values are in an arithmetic sequence after being sorted from small to large, and the assigned relative humidity should be in the comfortable humidity interval, i.e. 45% to 70%, and i≤m*n. When n, m and i are all 3, as shown in Table 1.

[0157] The principle of assigning the set relative humidity is that: when the outdoor temperature is high, the cooling load is large, the required sensible cooling amount is large, and the accompanying latent cooling amount is large, i.e. the dehumidification amount is large, the set relative humidity value is low; when the outdoor temperature is low, the cooling load is low, the required sensible cooling amount is small, and the accompanying latent cooling amount is small, i.e. the dehumidification amount is small, the set relative humidity value is high; the set relative humidity set when the dehumidification amount is large is high, and the set relative humidity set when the dehumidification amount is small is small, so that the user feels comfortable and the dehumidification is easy to achieve.

[0158] Table 1

[0159]

[0160] 45%≤RHs_L<RHs_M<RHs_H≤70%, and RHs_L+RHs_H=2*RHs_M is recommended.

[0161] RHs_L=52%, RHs_M=60%, and RHs_H=68%, as shown in Table 2.

[0162] Table 2

[0163]

[0164] Among them, RH1 is the first preset humidity, and RH2 is the second preset humidity.

[0165] In some embodiments of the present application, reference is made to Figure 4 The indoor fan calculated rotating speed is determined according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs, and is specifically (Formula 1):

[0166] When TL(n)-TLs>1.0, R 计 =R(n-1)-R;

[0167] When TL(n)-TLs<-1.0, R 计 =R(n-1)+R;

[0168] When -1.0≤TL(n)-TLs≤1.0, R 计 =R(n-1);

[0169] Wherein, R 计 is the indoor fan calculated rotating speed, R(n-1) is the last determined indoor fan rotating speed, and R is the first preset rotating speed.

[0170] Wherein, R can be 30 rpm.

[0171] In the present application, the indoor fan calculated rotating speed is determined according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs, which can determine the decrease, maintenance and increase of the indoor fan rotating speed according to the current dehumidification demand to enhance, maintain or reduce the dehumidification capacity, so that the dehumidification can be performed as needed to ensure the comfort of the user.

[0172] In some embodiments of the present application, reference is made to Figure 5 The indoor fan minimum rotating speed Rmin is determined according to the current compressor frequency F(n), and is specifically (Formula 2):

[0173] When F(n)=Fmin, Rmin=R dm ;

[0174] When Fmin<F(n)≤F1, Rmin=R dm +(R L -R dm ) / (F1-Fmin)*(F-Fmin);

[0175] When F(n)>F1, Rmin=R L ;

[0176] Wherein, F(n) is the current compressor frequency, F1 is the first preset threshold of the compressor frequency, Fmin is the minimum frequency of the compressor, and Fmin<F1; R dm is the reliable minimum rotating speed of the indoor fan, and R L is the low rotating speed of the indoor fan.

[0177] In the present application, the compressor frequency F(n) is coupled with the indoor motor minimum speed Rmin for control, which can prevent temperature and humidity control respectively, prevent compressor frequency and indoor motor speed independent control, avoid actual dehumidification amount not maximized, and further avoid affecting the reduction of room humidity.

[0178] Q 总 =Q 显 +Q 潜 , Q 显 controls the change of temperature, Q 潜 controls the air moisture content or dew point temperature, when Q 显 =0, that is, no refrigeration capacity, when Q 潜 =0, that is, no dehumidification capacity, for low cooling load and high humidity load demand, the essence is to improve the latent heat ratio, that is, Q 潜 / Q 总 , the higher the latent heat ratio, the smaller the cooling, and the larger the dehumidification capacity, and the corresponding Q 潜 / Q 显 , the larger the dehumidification capacity.

[0179] The dew point temperature is determined by temperature and humidity together, and the air state point A to B, if the dew point temperature does not change, it means that the humidity is constant and the temperature is changed, if it decreases, it means that there is dehumidification. Assuming that the state point A, the air moisture content is 20g / kg, the air moisture content of the state point B is 10g / kg, the air density is 1.169kg / m 3 , the room air volume is 20m 3 , then the room air from the state point A to the state point B, the actual dehumidification capacity=(20g / kg-10g / kg)*1.169kg / m 3 *20m 3 =233.8g.

[0180] The greater the difference between the current dew point temperature and the target dew point temperature, the greater the dehumidification demand.

[0181] The dehumidification capacity G=K1*V*(TL-Te) (formula 3);

[0182] Wherein, K1 is the dehumidification constant, V is the circulating air volume, TL is the dew point temperature, and Te is the indoor heat exchanger evaporation temperature.

[0183] V=K2*R (formula 4), wherein K2 is the air speed constant.

[0184] Dehumidification capacity G=K1*K2*R*(TL-Te) (formula 5).

[0185] According to formula 5, the greater (TL-Te), the greater the dehumidification amount; according to formula 1, the greater (TL-TLs), the indoor fan speed is always decreasing. And in Table 3, the initial indoor environment temperature is the same, the initial indoor relative humidity is different, the set temperature is the same, the set relative humidity is different, and the dehumidification amount data of several groups of tests, the test data show that the actual dehumidification amount is lower when the set relative humidity is low, and the actual circulating air volume is also reduced. That is, when temperature and humidity are controlled respectively, the dehumidification amount is difficult to control to the maximum value. When the indoor fan speed is very small, even if (TL-Te) is very large, the actual dehumidification amount is very small; when (TL-Te) tends to 0℃, even if the indoor fan speed is very large, the actual dehumidification amount tends to 0W, therefore, in the present application, the compressor frequency and the indoor motor minimum speed are coupled to control, to realize temperature and humidity control.

[0186] Table 3

[0187]

[0188]

[0189] In some embodiments of the present application, with reference to Figure 6 , the controller is configured to:

[0190] After receiving the dehumidification instruction, it is judged whether the indoor fan and the outdoor fan run for more than a first preset time t1 within a certain time before the present time, when it is no, the indoor fan and the outdoor fan are controlled to rotate and run for the first preset time t1, and the set relative humidity TLs is determined according to the current indoor environment temperature Ta(n) and the current indoor environment relative humidity RH(n) obtained when the indoor fan and the outdoor fan run to the first preset time; when it is yes, the current indoor environment temperature Ta(n), the current indoor environment relative humidity RH(n) and the current outdoor environment temperature Tout(n) are obtained, and the set relative humidity TLs is determined according to the obtained current indoor environment temperature Ta(n) and the current indoor environment relative humidity RH(n).

[0191] Before obtaining the current indoor environment temperature Ta(n) and the current indoor environment relative humidity RH(n), the indoor fan and the outdoor fan are rotated, which can eliminate the radiation influence and make the air flow, so that the real indoor environment temperature and the outdoor environment temperature can be obtained, and the authenticity of the set relative humidity is improved.

[0192] Wherein, t1 is any value in 5s-180s, wherein t1 can be 30s, when t1 is 30s, the running time will not be too long, and the radiation influence can be eliminated, avoiding obtaining inaccurate indoor environment temperature and outdoor environment temperature.

[0193] Among them, the operating speed of the indoor fan and the outdoor fan can be obtained according to the outdoor temperature and the set temperature difference. Specifically, a two-dimensional data table can be set in advance, in which the corresponding indoor fan speed and outdoor fan speed are determined according to the outdoor temperature and the set temperature difference.

[0194] In some embodiments of the present application, under normal circumstances, when E(n) < 0°C, that is, the temperature set by the user is higher than the actual room temperature, the compressor will not start; when E(n) > 0°C, the air conditioner turns on the dehumidification mode and the compressor will definitely start.

[0195] The air conditioner also includes a remote controller for the air conditioner indoor unit, wherein the set temperature Ts is the temperature set for dehumidification, and the set temperature Ts is set according to the user's set temperature T 用 s to determine, the user sets the temperature T 用 s can be set using the remote control.

[0196] refer to Figure 7 , the method for determining the set temperature Ts is specifically as follows:

[0197] If Ta(n)-T 用 s>0℃, then Ts=T 用 s;

[0198] If Ta(n)-T 用 s≤0°C, then Ts=Ta(n)-T1, where T1 is the first preset temperature.

[0199] Among them, Ta(n) is the current indoor ambient temperature, T 用 s is the temperature set by the user, T 用 s can be set using the remote control.

[0200] Generally, when E(n) < 0°C, that is, the temperature set by the user is higher than the actual room temperature, the compressor will not start. Since E(n) = Ta(n) - Ts = Ta(n) - (Ta(n) - T1) = T1 > 0°C, the air conditioner turns on the dehumidification mode at this time and the compressor can definitely start. Therefore, this method of determining the set temperature Ts is set so that the set temperature difference E(n) (E(n) = Ta(n) - Ts) > 0, ensuring that the compressor can start normally.

[0201] Among them, T1 generally takes any value between 0.1℃-5℃, among which T1 can be 1.5℃, so that the temperature is neither too high nor too low, avoiding T1 temperature being too low, which causes the compressor dehumidification operation time to be too short and the dehumidification effect to be poor.

[0202] In some embodiments of the present application, the air conditioner further includes an electric heating device, wherein the electric heating device is disposed in the indoor casing, and the electric heating device is located between the indoor heat exchanger and the indoor fan.

[0203] The electric heating device is connected with the controller, and the controller can control the working state of the electric heating device according to the logic set by itself, so that the air conditioner can work normally.

[0204] Reference Figure 8 The controller is configured to:

[0205] After receiving the dehumidification instruction, the indoor environment temperature Ta(n) and the indoor environment relative humidity RH(n) are detected in real time, and the electric heating device is started when the electric heating device meets the starting condition of the electric heating device.

[0206] The starting condition of the electric heating device is that the set temperature difference E(n) is less than or equal to a first preset set temperature difference E1, and the real-time detected indoor environment relative humidity RH(n) is greater than or equal to a set humidity RHs plus a third preset humidity RH3.

[0207] The set temperature difference E(n) is the difference between the real-time detected indoor environment temperature Ta(n) and the set temperature Ts.

[0208] The first preset set temperature difference E1 can be 0℃. The third preset humidity RH3 is 5%.

[0209] After the electric heating device is started, the electric heating device is operated for at least a fourth preset time t4. The fourth preset time is 5 minutes.

[0210] In some embodiments of the present application, reference Figure 9 The controller is configured to:

[0211] After the electric heating device is started for at least the fourth preset time, the indoor environment temperature Ta(n) and the indoor environment relative humidity RH(n) are detected in real time, and the electric heating device is stopped when the electric heating device meets the stopping condition of the electric heating device.

[0212] The set temperature difference E(n) is greater than a second preset set temperature difference E2, or the real-time detected indoor environment relative humidity RH(n) is less than the set relative humidity RHs.

[0213] The set temperature difference E(n) is the difference between the real-time detected indoor environment temperature Ta(n) and the set temperature Ts.

[0214] After the electric heating device is stopped, the electric heating device can be started again only after being stopped for at least a fifth preset time.

[0215] The fifth preset time is 2 minutes.

[0216] In some embodiments of the present application, reference Figure 10 The controller is configured to:

[0217] After the electric heating device is closed for at least the fifth preset time, the electric heating device is opened, closed, and opened again in a cycle.

[0218] The electric heating device is opened to offset the sensible cooling capacity, so that the room temperature does not decrease or slightly decreases, the electric heating device is intermittently operated, the electric heating operation power consumption is inhibited, and energy is saved.

[0219] In some embodiments of the present application, the air conditioner further comprises an electric heating indicator light or icon.

[0220] During the heating operation, when the electric heating device is opened, the electric heating indicator light or the icon displayed on the screen is lit, but when dehumidification is performed, in order to avoid misunderstanding by the user, when the electric heating device is opened, the electric heating indicator light or the icon displayed on the screen is not lit.

[0221] In some embodiments of the present application, the controller is configured to:

[0222] After the compressor is operated at the initial frequency for the second preset time t2, the frequency of the compressor is periodically determined;

[0223] In each compressor frequency determination period, the compressor frequency F(n) in the current period = the compressor frequency F(n-1) in the previous period + the compressor frequency change dF in the current period;

[0224] After the compressor frequency in the current period is determined, the compressor is operated at the compressor frequency in the current period.

[0225] The compressor frequency change dF in the current period can be a fixed value.

[0226] The period for determining the compressor frequency is the seventh preset time t7. The seventh preset time t7 can be 5 minutes. The second preset time t2 can be 10 minutes.

[0227] The compressor frequency change dF in the current period can be positive or negative or 0. Fmin≤F(n)≤Fmax, Fmin is the minimum frequency of the compressor, and Fmax is the maximum frequency of the compressor.

[0228] Alternatively, the compressor frequency change dF in the current period is determined according to the set temperature difference E(n) in the current period and the set temperature difference change rate ΔE;

[0229] The set temperature difference E(n) in the current period is the difference between the current indoor environment temperature Ta(n) and the set temperature Ts;

[0230] The set temperature difference change rate ΔE(n) = the set temperature difference E(n-1) in the previous period - the set temperature difference E(n) in the current period;

[0231] Specifically, the current cycle set temperature difference E(n) and the current cycle set temperature difference change rate AE are used to look up the current cycle compressor frequency change amount dF in a preset data table (Table 4); if the current cycle set temperature difference E(n) and the current cycle set temperature difference change rate AE exist in the table, the corresponding compressor frequency change amount dF is determined; if either of the current cycle set temperature difference E(n) and the current cycle set temperature difference change rate AE does not exist in the preset data table, data close to the same is found, and then the corresponding compressor frequency change amount dF is determined.

[0232] Table 4

[0233]

[0234] The values of a1, a2, a3, a4, and a5 decrease in turn. The values of a6, a7, a8, and a9 also decrease in turn.

[0235] In some embodiments of the present application, the electric heating device is a PTC ceramic electric heating device, and the PTC ceramic is a "positive temperature coefficient ceramic".

[0236] When the PTC ceramic electric heating device is working, the resistance is very small at room temperature, but will suddenly increase by thousands to millions of times when the temperature rises to a certain specific temperature (transition temperature), and will return to the original state when the temperature drops.

[0237] PTC is the abbreviation of English positive temperature coefficient ceramic, and PTC ceramic is a kind of electronic ceramic. PTC ceramic is made of high-purity barium titanate doped with niobium, bismuth, antimony, lead, manganese, silicon oxide, etc., and sintered at 1300-1350℃. The performance of PTC ceramic varies with different room temperature resistivity, temperature transition, resistance temperature coefficient, and maximum resistivity.

[0238] When dehumidifying, the electric heating device needs to be operated intermittently, and the surrounding is cold air. The heat generation of the body of the electric heating device is automatically adjusted when working, and the surface temperature is constant. When stopped, there is no safety risk of dew condensation on the body. Therefore, the type of the electric heating device is PTC type.

[0239] In some embodiments of the present application, the parameters of the air conditioner are set as follows:

[0240] t1 = 30s, E1 = 0℃, Fmin = 10Hz, F0 = 50Hz, F1 = 30Hz, R dm = 400rpm, R L = 700rpm,

[0241] R H= 900 rpm, dF = 5 Hz, R = 30 rpm, t2 = 10 min, t3 = 5 min, t4 = 5 min, t5 = 2 min, t7 = 5 min, T1 = 32°C, T2 = 27°C, RH1 = 85%, RH2 = 75%, m = 3, n = 3, i = 3, RHs_L = 52%, RHs_M = 60%, RHs_H = 68%, RH3 = 5%. The electric heating symbol is screen display.

[0242] Example 1:

[0243] Upon receiving the dehumidification instruction, Ts = 25°C, control the indoor motor and the outdoor motor to run first for t1 = 30 s,

[0244] Detect Ta(0) = 27°C, RH(0) = 89%, Tout(0) = 26°C, look up Table 2, RHs = 68%.

[0245] The compressor runs at a frequency F0 = 50 Hz, and the indoor fan runs at a speed R0 = R H = 900 rpm,

[0246] After 10 min, detect Ta = 26°C, RH = 82%, F = 45 Hz.

[0247] Calculate TL = 22.6°C, TLs = 18.6°C,

[0248] TL-TLs = 22.6-18.6 = 4°C (4 is greater than 1), R(2) = R(1)-R = 900-50 = 850 rpm.

[0249] New cycle (t3 = 5 min),

[0250] Detect Ta = 25.5°C, RH = 78%, F = 40 Hz, calculate TL = 21.3°C,

[0251] TL-TLs = 21.3-18.6 = 2.7°C, R(3) = R(2)-R = 850-50 = 800 rpm.

[0252] New cycle,

[0253] Detect Ta = 25.4°C, RH = 74%, F = 36 Hz, calculate TL = 20.3°C,

[0254] TL-TLs = 20.3-18.6 = 1.7°C, R(4) = R(3)-R = 800-50 = 750 rpm.

[0255] New cycle,

[0256] Test Ta = 25.3°C, RH = 76%, F = 36Hz, calculate TL = 20.6°C,

[0257] TL-TLs = 20.6-18.6 = 2°C, R(5) = R(4)-R = 750-50 = 700rpm.

[0258] New cycle,

[0259] Test Ta = 25.2°C, RH = 74%, F = 34Hz, calculate TL = 20.1°C,

[0260] TL-TLs = 20.1-18.6 = 1.5°C, R(6) = R(5)-R = 850-50 = 650rpm.

[0261] Now F = 34Hz > F1 = 30Hz, according to equation 2, the minimum speed Rmin = R L = 700rpm, so the actual R(6) = 700rpm.

[0262] New cycle,

[0263] Test Ta = 24.9°C, RH = 74%, F = 32Hz, calculate TL = 19.8°C,

[0264] TL-TLs = 19.8-18.6 = 1.2°C, R(7) = R(6)-R = 700-50 = 650rpm.

[0265] Now F = 32Hz > F1 = 30Hz, according to equation 2, the minimum speed Rmin = R L = 700rpm, so the actual R(7) = 700rpm. At this time, E = Ta-Ts = 24.9-25 = -0.1°C, and RH > RHs+RH3 = 68+5 = 73%, forced to open the electric heating, electric heating screen icon does not light up.

[0266] Example 2:

[0267] Receive dehumidification mode, Ts = 25°C, control indoor motor and outdoor motor first run t1 = 30s,

[0268] Test Ta(0) = 26.5°C, RH(0) = 84%, Tout(0) = 28°C, look up table 2, RHs = 52%.

[0269] The compressor runs at the initial frequency F0 = 50Hz, the indoor fan runs at the initial speed R0 = R H = 900rpm,

[0270] After 10min, test Ta = 26°C, RH = 78%, F = 45Hz.

[0271] TL = 21.7°C, TLs = 14.3°C, calculated,

[0272] TL-TLs = 21.7-14.3 = 7.4°C, R(2) = R(l)-R = 900-50 = 850 rpm.

[0273] new cycle (t3 = 5 min),

[0274] detected Ta = 25.5°C, RH = 74%, F = 35 Hz, calculated TL = 20.4°C,

[0275] TL-TLs = 20.4-14.3 = 6.1°C, R(3) = R(2)-R = 850-50 = 800 rpm.

[0276] new cycle,

[0277] detected Ta = 25.0°C, RH = 69%, F = 25 Hz, calculated TL = 18.8°C,

[0278] TL-TLs = 18.8-14.3 = 4.5°C, R(4) = R(3)-R = 800-50 = 750 rpm.

[0279] At this time, E = Ta-Ts = 25-25 = 0°C, and RH > RHs+RH3 = 52+5 = 57%, the electric heating is forced to be turned on, and the electric heating screen icon is not lit.

[0280] new cycle,

[0281] detected Ta = 25°C, RH = 64%, F = 20 Hz, calculated TL = 17.6°C,

[0282] TL-TLs = 17.6-14.3 = 3.3°C, R(5) = R(4)-R = 750-50 = 700 rpm.

[0283] At this time, E = Ta-Ts = 25-25 = 0°C, and RH > RHs+RH3 = 52+5 = 57%, the electric heating continues to be in the on state.

[0284] new cycle,

[0285] detected Ta = 25°C, RH = 60%, F = 20 Hz, calculated TL = 16.5°C,

[0286] TL-TLs = 16.5-14.3 = 2.2°C, R(6) = R(5)-R = 700-50 = 650 rpm.

[0287] At this time, E = Ta-Ts = 25-25 = 0℃, and RH > RHs+RH3 = 52+5 = 57%, the electric heating continues to be in the open state.

[0288] According to formula 2,

[0289] Rmin = R dm +(R L -R dm ) / (F1-Fmin)*(F-Fmin) = 400+(700-400) / (30-10)*(20-10) = 55

[0290] 0rpm < 650rpm,

[0291] Therefore, R(6) = 650rpm.

[0292] After another 3 cycles,

[0293] The detection Ta = 25℃, RH = 57%, F = 20Hz, and the calculation TL = 15.5℃,

[0294] TL-TLs = 15.5-14.3 = 1.2℃, R(9) = R(8)-R = 550-50 = 500rpm.

[0295] At this time, E = Ta-Ts = 25-25 = 0℃, and RH > RHs+RH3 = 52+5 = 57%, the electric heating continues to be in the open state.

[0296] According to formula 2,

[0297] Rmin = R dm +(R L -R dm ) / (F1-Fmin)*(F-Fmin) = 400+(700-400) / (30-10)*(20-10) = 55

[0298] 0rpm > 500rpm,

[0299] Therefore, R(9) = Rmin = 550rpm.

[0300] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0301] The terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying a number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0302] In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connected", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0303] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioner, characterized in that: include: an indoor casing having an indoor air inlet; an indoor fan, disposed in the indoor casing; an outdoor housing having an outdoor air inlet; a compressor, disposed in the outdoor casing; An outdoor ambient temperature detection device, for detecting the outdoor ambient temperature, the outdoor ambient temperature detection device being connected to the outdoor housing and located at the outdoor air inlet; An indoor environment detection device, used to detect the indoor environment temperature and the indoor environment relative humidity, the indoor environment detection device is connected to the indoor housing and is located at the indoor air inlet; A controller configured to: After receiving the dehumidification command, Get the set temperature Ts; Get the current indoor ambient temperature Ta(n), the current indoor relative humidity RH(n), and the current outdoor ambient temperature Tout(n); Determine the set relative humidity RHs based on the current outdoor ambient temperature Tout(n) and the current indoor ambient relative humidity RH(n); Calculate the set temperature difference E(n), which is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts; When the set temperature difference E(n) is greater than 0, the compressor is controlled to start and the indoor fan is rotated. The compressor runs at the initial frequency F(0) and the indoor fan runs at the initial speed R(0); After the compressor runs at the initial frequency for the second preset time t2, the indoor fan speed R(n) is periodically determined, and the indoor fan runs at the indoor fan speed R(n) determined in the current period. The periodic determination of the indoor fan speed R(n) is specifically as follows: Obtain the current compressor frequency F(n), the current indoor ambient temperature Ta(n), and the current indoor ambient humidity RH(n); Calculate the current dew point temperature TL(n) based on the current indoor ambient temperature Ta(n) and the current indoor ambient relative humidity RH(n); Calculate the target dew point temperature TLs according to the set temperature Ts and the set relative humidity RHs; The indoor fan speed R is determined based on the difference between the current dew point temperature TL(n) and the target dew point temperature TLs. 计 ; Determine the minimum speed Rmin of the indoor fan according to the current compressor frequency F(n); When the calculated speed of the indoor fan is greater than or equal to the minimum speed of the indoor fan, the indoor fan speed R(n) of the current cycle is the calculated speed R 计 , when the calculated speed of the indoor fan is less than the minimum speed of the indoor fan, the indoor fan speed R(n) of the current cycle is the minimum speed of the indoor fan Rmin.

2. The air conditioner according to claim 1, characterized in that The indoor fan speed is calculated based on the difference between the current dew point temperature TL(n) and the target dew point temperature TLs: When TL(n) - TLs > 1.0, R 计 = R(n - 1) - R; When TL(n) - TLs < -1.0, R 计 = R(n - 1) + R; When -1.0≤TL(n)-TLs≤1.0, R 计 =R(n-1); Among them, R 计 Calculate the speed of the indoor fan, R(n-1) is the last determined speed of the indoor fan, and R is the first preset speed.

3. The air conditioner according to claim 1, characterized in that The minimum speed Rmin of the indoor fan is determined according to the current compressor frequency F(n): When F(n)=Fmin, Rmin=R dm ; When Fmin < F(n) ≤ F1, Rmin = R dm +(R L -R dm ) / (F1 - Fmin) * (F - Fmin); When F(n)>F1, Rmin=R L ; Among them, F(n) is the current compressor frequency, F1 is the first preset threshold of the compressor frequency, Fmin is the minimum frequency of the compressor, and Fmin is the minimum frequency of the compressor. <F1;R dm The minimum speed allowed for reliable operation of the indoor fan, R L Indoor fan low speed.

4. The air conditioner according to claim 1, wherein: Also includes: an indoor heat exchanger, disposed in the indoor casing and located on a side of the indoor fan close to the indoor air inlet; an electric heating device, disposed in the indoor casing and located between the indoor heat exchanger and the indoor fan; The controller is configured to: After receiving the dehumidification instruction, the indoor environment temperature Ta(n) and the indoor environment relative humidity RH(n) are detected in real time. When the electric heating device meets the start-up conditions of the electric heating device, the electric heating device is turned on. The start-up conditions of the electric heating device are: the set temperature difference E(n) ≤ the first preset set temperature difference E1, and the real-time detected indoor environment relative humidity RH(n) ≥ the set humidity RHs + the third preset humidity RH3; The set temperature difference E(n) is the difference between the real-time detected indoor ambient temperature Ta(n) and the set temperature Ts.

5. The air conditioner according to claim 4, characterized in that The controller is configured to: After the electric heating device is turned on for at least a fourth preset time, the indoor ambient temperature Ta(n) and the indoor ambient relative humidity RH(n) are detected in real time. When the electric heating device meets the shutdown condition of the electric heating device, the electric heating device is turned off. The shutdown condition of the electric heating device is: The set temperature difference E(n)>the second preset set temperature difference E2, or the real-time detected indoor environment relative humidity RH(n)<the set relative humidity RHs; The set temperature difference E(n) is the difference between the real-time detected indoor ambient temperature Ta(n) and the set temperature Ts.

6. The air conditioner according to claim 1, characterized in that The controller is configured to: After the compressor runs at the initial frequency for a second preset time t2, the compressor frequency is periodically determined. In each compressor frequency determination cycle, the compressor frequency F(n) of this cycle = the previous compressor frequency F(n-1) + the compressor frequency change dF of this cycle; After the compressor frequency of this cycle is determined, the compressor operates at the compressor frequency of this cycle.

7. The air conditioner according to claim 6, characterized in that The frequency change dF of the compressor in this cycle is determined by the set temperature difference E(n) in this cycle and the set temperature difference change rate ΔE in this cycle; The set temperature difference E(n) of this cycle is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts; The set temperature difference change rate of this cycle ΔE(n) = the previous set temperature difference E(n-1) - the set temperature difference E(n) of this cycle.

8. The air conditioner according to claim 1, wherein: The set relative humidity RHs corresponding to the current outdoor ambient temperature Tout(n) and the current indoor ambient relative humidity RH(n) is determined according to a preset two-dimensional data set.

9. The air conditioner according to claim 4, characterized in that The air conditioner further comprises: Electric heating indicator light or icon; During dehumidification, after the electric heating device is turned on, the electric heating indicator light or the icon displayed on the screen does not light up.

10. An air conditioner, characterized in that: include: an indoor casing having an indoor air inlet; an indoor fan, disposed in the indoor casing; an outdoor housing having an outdoor air inlet; a compressor, disposed in the outdoor casing; An outdoor ambient temperature detection device, for detecting the outdoor ambient temperature, the outdoor ambient temperature detection device being connected to the outdoor housing and located at the outdoor air inlet; An indoor environment detection device, used to detect the indoor environment temperature and the indoor environment relative humidity, the indoor environment detection device is connected to the indoor housing and is located at the indoor air inlet; A controller configured to: After receiving the dehumidification command, Get the set temperature Ts; Get the current indoor ambient temperature Ta(n), the current indoor relative humidity RH(n), and the current outdoor ambient temperature Tout(n); Determine the set relative humidity RHs based on the current outdoor ambient temperature Tout(n) and the current indoor ambient relative humidity RH(n); Calculate the set temperature difference E(n), which is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts; When the set temperature difference E(n) is greater than 0, the compressor is controlled to start and the indoor fan is rotated. The compressor runs at the initial frequency F(0) and the indoor fan runs at the initial speed R(0); After the compressor runs at the initial frequency for the second preset time t2, the indoor fan speed R(n) is periodically determined, and the indoor fan runs at the indoor fan speed R(n) determined in the current period. The periodic determination of the indoor fan speed R(n) is specifically as follows: Obtain the current compressor frequency F(n), the current indoor ambient temperature Ta(n), and the current indoor ambient humidity RH(n); Calculate the current dew point temperature TL(n) based on the current indoor ambient temperature Ta(n) and the current indoor ambient relative humidity RH(n); Calculate the target dew point temperature TLs according to the set temperature Ts and the set relative humidity RHs; The indoor fan speed R is determined based on the difference between the current dew point temperature TL(n) and the target dew point temperature TLs. 计 ; Determine the minimum speed Rmin of the indoor fan according to the current compressor frequency F(n); When the calculated speed of the indoor fan is greater than or equal to the minimum speed of the indoor fan, the indoor fan speed R(n) of the current cycle is the calculated speed R 计 , when the calculated speed of the indoor fan is less than the minimum speed of the indoor fan, the indoor fan speed R(n) of the current cycle is the minimum speed of the indoor fan Rmin; The initial speed R(0) is greater than R dm , R dm The minimum speed allowed for reliable operation of the indoor fan.

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