Air conditioner

Abstract

The invention provides an air conditioner which is characterized in that a controller is configured to obtain a set temperature Ts after a dehumidification instruction is received; determining a set relative humidity; when the set temperature difference is larger than 0, the compressor is started, the indoor fan rotates, and after the compressor operates for a second preset time, the rotating speed of the indoor fan is determined, specifically, the current dew point temperature and the target dew point temperature are calculated; according to the difference value between the current dew-point temperature and the target dew-point temperature, the calculated rotating speed of an indoor fan is determined; determining the minimum rotating speed of an indoor fan according to the current compressor frequency; when the calculated rotating speed of the indoor fan is larger than or equal to the minimum rotating speed of the indoor fan, the rotating speed of the indoor fan in the current period is the calculated rotating speed of the indoor fan, and when the calculated rotating speed of the indoor fan is smaller than the minimum rotating speed of the indoor fan, the rotating speed of the indoor fan in the current period is the minimum rotating speed of the indoor fan; coupling of the minimum rotating speed of the indoor motor and the frequency of the compressor can be achieved, and the actual dehumidification amount can be maximized as much as possible.

Description

Technical Field

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

[0002] During the return of the south wind or the plum rains or in coastal areas such as Qingdao, the room temperature is suitable, but the relative humidity is high, and the maximum relative humidity can be close to 100%. Users feel cold, and the items in the room, especially the textiles, are damp. Water even seeps from the walls. At this time, the cooling load in the room is low (the cooling load demand is very low or even 0W, and the room temperature drop demand is very small, and even no cooling is required), and the wet load is high (the room needs dehumidification, and dehumidification is the main demand of users). Split air conditioners include air conditioner indoor units and air conditioner outdoor units. The air conditioner indoor unit includes an indoor heat exchanger, indoor fan and indoor air guide plate, and the air conditioner outdoor unit includes a compressor and an outdoor fan.

[0003] Conventional air conditioners do not have dehumidification valves (the dehumidification valve divides the indoor heat exchanger into two parts, the first half is condensation heating, the second half is evaporation cooling and dehumidification, the sensible heat and sensible cooling are offset, which is equivalent to dehumidification without lowering the actual temperature), that is, dehumidification without cooling is impossible. Therefore, conventional air conditioners need to cool down to dehumidify, but the cooling load in the room is low, then the temperature in the room is suitable, and almost no cooling is required. The compressor must run at a low frequency during dehumidification. At this time, the evaporation temperature is higher than the dew point temperature, and dehumidification cannot be achieved. Alternatively, 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 poor. For example: when the room temperature is low, such as 22°C, and the outdoor ambient temperature is low, such as 23°C, in order to dehumidify, the room set temperature is set at 21°C or below. At this time, the cooling load of the room is only tens of W, or even 0 W. Even if the compressor runs at a low frequency, such as 10Hz, and the indoor fan motor runs at the lowest allowable reliable operating speed, such as 300rpm, the output capacity of the air conditioner at this time is more than 500W, which is much greater than the room cooling load, and the room temperature still drops significantly.

[0004] In the prior art, in weather with low cooling load and high humidity load, when the room temperature is set appropriately, a certain degree of dehumidification can be achieved by simply relying on the fan motor speed to lower the evaporation temperature. However, under many working conditions, this method has certain limitations. Lowering the evaporation temperature can easily trigger the freezing protection parameter protection and reduce the frequency (the freezing protection parameter does not change with the room temperature and is a set of fixed values), resulting in a contradictory situation of increasing the frequency on one side and reducing the frequency on the other side, and effective dehumidification is still not possible. Therefore, the present application proposes an air conditioner. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

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

[0007] An indoor casing having an indoor air inlet;

[0008] An indoor fan, disposed in the indoor casing;

[0009] An outdoor casing having an outdoor air inlet;

[0010] A compressor is disposed in the outdoor casing;

[0011] An outdoor environment temperature detection device, used to detect the outdoor environment temperature, the outdoor environment temperature detection device is connected to the outdoor housing and is located at the outdoor air inlet;

[0012] 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;

[0013] A controller, the controller being configured to:

[0014] After receiving the dehumidification command,

[0015] Get the set temperature Ts;

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

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

[0018] Calculate the set temperature difference E(n), where the set temperature difference E(n) 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, the compressor is controlled to start and the indoor fan is controlled to rotate. The compressor runs at the initial frequency F(0) and the indoor fan runs at the initial speed R(0);

[0020] 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:

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

[0022] Calculate the 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] Calculate the target dew point temperature TLs according to the set temperature Ts and the set relative humidity RHs;

[0024] 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 ;

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

[0026] 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.

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

[0028] According to an embodiment of the present disclosure, the indoor fan speed is determined and calculated based on the difference between the current dew point temperature TL(n) and the target dew point temperature TLs as follows:

[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] 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.

[0033] The indoor fan's calculated rotational speed is determined based on the difference between the current dew point temperature TL(n) and the target dew point temperature TLs. It can determine whether to reduce, maintain, or increase the rotational speed of the indoor fan according to the current dehumidification demand, so as to enhance, maintain, or reduce the dehumidification capacity, enabling dehumidification to be carried out as needed and ensuring user comfort.

[0034] According to an embodiment of the present disclosure, determining the minimum rotational speed Rmin of the indoor fan based on the current compressor frequency F(n) is specifically as follows:

[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 compressor frequency, and Fmin < F1; R dm is the reliably allowable minimum rotational speed of the indoor fan, and R L is the low rotational speed of the indoor fan.

[0039] Setting the coupling control of the compressor frequency F(n) and the minimum rotational speed Rmin of the indoor motor can prevent separate control of temperature and humidity, prevent independent control of the compressor frequency and the rotational speed of the indoor motor, avoid the actual dehumidification amount not being maximized, and thus avoid affecting the reduction of the room humidity.

[0040] According to an embodiment of the present disclosure, it further includes:

[0041] An indoor heat exchanger, which is arranged inside the indoor machine case and on the side of the indoor fan close to the indoor air inlet;

[0042] An electric heating device, which is arranged inside the indoor machine case and 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. When the electric heating device meets the start-up condition of the electric heating device, the electric heating device is turned on. The start-up condition of the electric heating device is: 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;

[0045] The set temperature difference E(n) is the difference between the real-time detected indoor ambient 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. 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:

[0048] 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;

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

[0050] Setting the electric heating device on can offset the sensible cooling, keep the room temperature from dropping or drop slightly, and realize intermittent operation of the electric heating device, which can suppress the power consumption of the electric heating operation and save energy.

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

[0052] After the compressor runs at the initial frequency for a second preset time t2, the frequency of the compressor 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;

[0053] After the compressor frequency of this cycle is determined, the compressor operates at the compressor frequency of this cycle.

[0054] According to an embodiment of the present disclosure, the compressor frequency change dF in this cycle is determined according to the set temperature difference E(n) in this cycle and the set temperature difference change rate ΔE in this cycle;

[0055] 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;

[0056] 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.

[0057] According to an embodiment of the present disclosure, the set 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 preset two-dimensional data set.

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

[0059] Electric heating indicator light or icon;

[0060] 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.

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

[0062] An indoor casing having an indoor air inlet;

[0063] An indoor fan, disposed in the indoor casing;

[0064] An outdoor casing having an outdoor air inlet;

[0065] A compressor is disposed in the outdoor casing;

[0066] An outdoor environment temperature detection device, used to detect the outdoor environment temperature, the outdoor environment temperature detection device is connected to the outdoor housing and is located at the outdoor air inlet;

[0067] 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;

[0068] A controller, the controller being configured to:

[0069] After receiving the dehumidification command,

[0070] Get the set temperature Ts;

[0071] Get the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n);

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

[0073] Calculate the set temperature difference E(n), where the set temperature difference E(n) is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts;

[0074] When the set temperature difference E(n) is greater than 0, the compressor is controlled to start and the indoor fan is controlled to rotate. The compressor runs at the initial frequency F(0) and the indoor fan runs at the initial speed R(0);

[0075] 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:

[0076] Obtain the current compressor frequency F(n), the current indoor ambient temperature Ta(n) and the current indoor ambient humidity RH(n);

[0077] Calculate the current dew point temperature TL(n) according to the current indoor ambient temperature Ta(n) and the current indoor ambient relative humidity RH(n);

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

[0079] 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 ;

[0080] Determine the minimum speed Rmin of the indoor fan according to the current compressor frequency F(n);

[0081] 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 of the indoor fan. 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.

[0082] The initial speed R(0) is greater than R dm , R dm The minimum speed allowed for the indoor fan to be reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

[0086] Figure 3 is a flow chart of determining the indoor fan speed according to an embodiment of the present application;

[0087] Figure 4 is a flow chart for determining the calculation speed of an indoor fan according to an embodiment of the present application;

[0088] Figure 5 is a flow chart for determining the minimum speed of an indoor fan according to an embodiment of the present application;

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

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

[0091] Figure 8 is a flowchart of starting the electric heating device of the air conditioner according to the embodiment of the present application;

[0092] Fig. 9 is a flow chart of shutting down the electric heating device of the air conditioner according to the embodiment of the present application;

[0093] Fig.10 It is a flow chart of the cycle of shutting down and restarting the electric heating device of the air conditioner according to the implementation mode of the present application.

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

[0095] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0096] During the return of south wind or plum rain days or in coastal areas such as Qingdao, the room temperature is suitable, but the relative humidity is high, and the maximum relative humidity can be close to 100%. Users feel cold, and items in the room, especially textiles, are damp, and water even seeps from the walls. At this time, the cold load in the room is low (the cold load demand is very low or even 0W, and the demand for room temperature reduction is very small, and even no cooling is required), while the wet load is high (the room requires dehumidification, and dehumidification is the main demand of users).

[0097] There is no dehumidification valve in a conventional air conditioner (the dehumidification valve divides the indoor heat exchanger into two parts, the first half is for condensation and heating, and the second half is for evaporation and cooling and dehumidification. The sensible heat and sensible cooling offset each other, which is equivalent to dehumidification without reducing the actual temperature). Therefore, dehumidification without cooling is impossible. Therefore, conventional air conditioners need to cool down to dehumidify. However, if the cooling load in the room is low, the temperature in the room is suitable and almost no cooling is required. During dehumidification, the compressor must run at a low frequency. At this time, the evaporation temperature is higher than the dew point temperature, and dehumidification cannot be performed. Alternatively, a lower temperature can be set to make the air conditioner dehumidify effectively, but the room temperature is low, the room is cold, and the user feels poor.

[0098] Therefore, the present application proposes an air conditioner, Figure 1-Figure 10 Describe the air conditioner.

[0099] The air conditioner includes 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] refer to Figure 1 The indoor unit of the air conditioner comprises an indoor casing 1, and an indoor air inlet 11 and an indoor air outlet 12 are arranged on the indoor casing.

[0102] When the indoor unit of the air conditioner is a hanging type, the height direction of the indoor casing is from the bottom end of the indoor casing to the top end of the indoor casing, the front-to-rear direction of the indoor casing is from the front side of the indoor casing to the rear side of the indoor casing, and the length direction of the indoor casing is from one side end of the indoor casing to the other side end of the indoor casing, among which any two of the height direction, the front-to-rear direction and the length direction of the indoor casing are perpendicular.

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

[0104] When the indoor unit of the air conditioner is a hanging type, the indoor air inlet can be opened at the top of the casing, and the indoor air outlet can be opened at the front lower part of the casing.

[0105] When the indoor unit of the air conditioner is a cabinet type, the indoor air inlet may be opened at the rear of the casing, and the indoor air outlet may be opened at the front of the casing.

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

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

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

[0109] The indoor fan is installed in the indoor casing and located in the indoor air duct. The indoor fan is used to provide power for the flow of air. Driven by the indoor fan, the indoor air enters the indoor air duct through the indoor air inlet. The air entering the indoor air duct exchanges heat with the indoor heat exchanger at the indoor heat exchanger. The air after heat exchange 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 outdoor unit of the air conditioner comprises an outdoor casing, an outdoor air inlet and an outdoor air outlet are arranged on the outdoor casing, and an outdoor air duct is arranged inside the outdoor casing, wherein the outdoor air inlet and the outdoor air outlet are connected with the outdoor air duct.

[0112] The air conditioner outdoor unit also includes an outdoor fan and an outdoor heat exchanger.

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

[0114] The outdoor fan is installed in the outdoor casing and located in the outdoor air duct. The outdoor fan is used to provide power for the flow of air. Driven by the outdoor fan, the outdoor air enters the outdoor air duct through the outdoor air inlet. The air entering the outdoor air duct exchanges heat with the outdoor heat exchanger at the outdoor heat exchanger. The air after heat exchange flows out of the outdoor air duct through the outdoor air outlet.

[0115] The air conditioner also includes a compressor and a throttling device. The compressor is arranged in the outdoor casing. The compressor compresses the refrigerant gas in a low-temperature and low-pressure state and discharges the refrigerant gas in a high-temperature and high-pressure state. The throttling device can be an expansion valve. The expansion valve expands the liquid refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid refrigerant.

[0116] Among the indoor heat exchanger and the outdoor heat exchanger, one is a condenser and the other is an evaporator. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process. The evaporator can achieve a cooling 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 sequentially connects a compressor, a condenser, an expansion valve, and an evaporator to circulate the 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 in sequence through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger; in the heating mode, the indoor heat exchanger is a condenser and the outdoor heat exchanger is an evaporator; the refrigerant circulates in sequence through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger.

[0118] The air conditioner further comprises a four-way valve, which changes the flow direction of the refrigerant so as to switch between the refrigeration cycle and the heating cycle. The expansion valve may be an electronic expansion valve.

[0119] The indoor unit of the air conditioner comprises an indoor air guide plate 23, wherein the indoor air guide plate is used to guide the air coming out of the indoor air outlet, and the indoor air guide plate is connected to the indoor unit casing.

[0120] Wherein, the indoor air guide plate is rotatably connected to the indoor casing.

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

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

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

[0124] In some embodiments of the present application, the air conditioner also 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 casing, and the indoor environment detection device is located at the indoor air inlet.

[0125] In the present application, an indoor environment detection device is provided to detect the indoor environment temperature and the indoor environment relative humidity so as to obtain the temperature parameters and relative humidity parameters of the indoor environment, and the indoor environment detection device is provided at the indoor air inlet, which can improve the detection accuracy. When the indoor air enters the indoor casing from the indoor air inlet, it will cause indoor circulation, which can more accurately detect the temperature and relative humidity of the indoor environment.

[0126] The indoor environment detection device may be an indoor environment temperature and humidity sensor. Alternatively, the indoor environment detection device includes an indoor environment temperature sensor and an indoor environment humidity sensor that are independent of each other.

[0127] In some embodiments of the present application, the air conditioner also includes a controller. Specifically, the controller includes a central processing unit (CPU), a video processor, an audio processor, a graphics processing unit (GPU), RAM Random Access Memory (RAM), ROM (Read-Only Memory, ROM), a first interface to an nth interface for input / output, a communication bus (Bus), etc.

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

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

[0130] In some embodiments of the present application, reference Figure 2-Figure 3 , the controller is configured as:

[0131] After receiving the dehumidification command,

[0132] Get the set temperature Ts;

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

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

[0135] Calculate the set temperature difference E(n), where the set temperature difference E(n) is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts;

[0136] When the set temperature difference E(n) is greater than 0, the compressor is controlled to start and the indoor fan is controlled to rotate. The compressor runs at the initial frequency F(0) and the indoor fan runs at the initial speed R(0);

[0137] 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:

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

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

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

[0141] 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 ;

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

[0143] 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 of the indoor fan. 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.

[0144] Among them, 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] Where, the initial speed R(0) = R L , where R dm <R L <R M <R H , where R dmThe minimum speed allowed for indoor fans, R L R is the low speed of the indoor fan. M is the medium speed of the indoor fan, R H Indoor fan high speed. Or, R(0)=R M , or R(0)=R H .

[0146] The second preset time t2 may be 10 minutes.

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

[0148] The period for determining the indoor fan speed R(n) is the third preset time t3, wherein the indoor fan speed is calculated once every third preset time. The third preset time may be 5 minutes.

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

[0150] In some embodiments of the present application, a 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] The current region can be determined based on the positioning, and the relative humidity can be set based on the current region and the current time.

[0152] Specifically, the region can be determined based on cloud positioning, and the humidity level of the current region can be determined based on the current time. The humidity level can be divided into high humidity, medium humidity and low humidity, and the current set relative humidity is determined based on the humidity level.

[0153] Among them, the set relative humidity value in high humidity areas is high, the set relative humidity value can be 64%~72%, and the preferred Rhs=68%; the set relative humidity value in medium humidity areas is medium-high, the set relative humidity value can be 56%~64%, and the preferred Rhs=60%; the set relative humidity value in low humidity areas is medium, the set relative humidity value can be 48%~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) may also be determined according to a preset two-dimensional data set.

[0155] Specifically, according to local weather forecast information or offline detected environmental parameters, the outdoor ambient 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, in which the data is the set relative humidity.

[0156] According to the size of cooling load (i.e., required sensible cooling capacity) and wet load (i.e., required latent cooling capacity), i set relative humidity values ​​are assigned in a two-dimensional table, and the i set relative humidity values ​​are arranged in an arithmetic progression from small to large, and the assigned relative humidity should be in the comfortable humidity range, i.e., 45% to 70%, i≤m*n. When n, m, and i are all 3, as shown in Table 1.

[0157] Principles for setting relative humidity values: when the outdoor temperature is high, the cooling load is large, the required sensible cooling capacity is large, and the accompanying latent cooling capacity is large, that is, the dehumidification capacity is large, and the set relative humidity value is low; when the outdoor temperature is low, the cooling load is low, the required sensible cooling capacity is small, and the accompanying latent cooling capacity is small, that is, the dehumidification capacity is small, and the set relative humidity value is high; when the dehumidification capacity is large, the set relative humidity is high, and when the dehumidification capacity is small, the set relative dehumidification capacity is small, so that the user feels comfortable and dehumidification is easy to achieve.

[0158] Table 1

[0159]

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

[0161] RHs_L=52%, RHs_M=60%, RHs_H=68%, see Table 2.

[0162] Table 2

[0163]

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

[0165] In some embodiments of the present application, with reference to Figure 4 , the calculated rotational speed of the indoor fan is determined according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs, specifically as (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 calculated rotational speed of the indoor fan, R(n - 1) is the previously determined rotational speed of the indoor fan, and R is the first preset rotational speed.

[0170] Wherein, R can be 30 rpm.

[0171] In the present application, setting the calculated rotational speed of the indoor fan according to the difference between the current dew point temperature TL(n) and the target dew point temperature TLs can determine the reduction, maintenance, and increase of the rotational speed of the indoor fan according to the current dehumidification demand to enhance, maintain, or reduce the dehumidification capacity, enabling dehumidification to be carried out as needed and ensuring user comfort.

[0172] In some embodiments of the present application, with reference to Figure 5 , the minimum rotational speed Rmin of the indoor fan is determined according to the current compressor frequency F(n), specifically as (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 compressor frequency, and Fmin < F1; R dm is the reliable allowable minimum rotational speed of the indoor fan, and R L is the low rotational speed of the indoor fan.

[0177] In the present application, the compressor frequency F(n) is set to be coupled with the minimum indoor motor speed Rmin for control, which can prevent the temperature and humidity from being controlled separately, prevent the compressor frequency and the indoor motor speed from being controlled independently, avoid the actual dehumidification amount from being maximized, and thus avoid affecting the reduction of room humidity.

[0178] Q 总 =Q 显 +Q 潜 , Q 显 Control temperature changes, Q 潜 Control the air humidity or dew point temperature. 显 = 0, that is, no cooling capacity, when Q 潜 = 0, that is, there is no dehumidification capacity. For the demand of low cooling load and high wet load, the essence is to increase the latent heat ratio, that is, Q 潜 / Q 总 , the higher the latent heat ratio, the smaller the cooling, and the greater the dehumidification capacity, the corresponding Q 潜 / Q 显 The larger it is, the greater the dehumidification capacity.

[0179] The dew point temperature is determined by temperature and humidity. If the dew point temperature does not change from state point A to state point B, it means constant humidity and temperature change. If it decreases, it means dehumidification. If the air humidity content at state point A is 20g / kg and the air humidity content at state point B is 10g / kg, the air density is 1.169kg / m 3 , the room air volume is 20m 3 , then the actual dehumidification capacity of the room air from state point A to state point B = (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 is G = K1*V*(TL-Te) (Formula 3);

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

[0183] V=K2*R (Formula 4), where K2 is the wind speed constant.

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

[0185] According to Formula 5, the larger (TL-Te), the greater the dehumidification capacity; according to Formula 1, the larger (TL-TLs), the faster the indoor fan speed is decreasing. Moreover, in Table 3, when the initial indoor ambient temperature is the same, the initial indoor relative humidity is different, the set temperature is the same, and the set relative humidity is different, several groups of dehumidification capacity data are tested. The experimental data show that the actual dehumidification capacity with a low set relative humidity is lower, and the actual circulating air volume is also reduced. That is, when the temperature and humidity are controlled separately, the dehumidification capacity is difficult to control to the maximum value. When the indoor fan speed is very small, even if (TL-Te) is large, the actual dehumidification capacity is also small; when (TL-Te) tends to 0°C, even if the indoor fan speed is very large, the actual dehumidification capacity tends to 0W. Therefore, in this application, the compressor frequency and the minimum speed of the indoor motor are set to be coupled to achieve temperature and humidity control.

[0186] Table 3

[0187]

[0188]

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

[0190] After receiving the dehumidification command, determine whether the indoor fan and the outdoor fan have been running for more than a first preset time t1 within a certain period of time before the current time. If not, control the indoor fan and the outdoor fan to rotate and run for the first preset time t1, and determine the set relative humidity TLs based on the current indoor ambient temperature Ta(n) and the current indoor ambient relative humidity RH(n) obtained when the indoor fan and the outdoor fan run for the first preset time; if yes, obtain the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n), and determine the set relative humidity TLs based on the obtained current indoor ambient temperature Ta(n) and the current indoor ambient relative humidity RH(n).

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

[0192] Wherein, t1 is any value between 5s and 180s, and t1 can be 30s. When t1 is 30s, the running time will not be too long, and the influence of radiation can be eliminated, thereby avoiding inaccurate indoor and outdoor ambient temperatures.

[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 pre-set, 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 a temperature set for dehumidification, and the set temperature Ts is set according to the user's set temperature T 用 s, 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] Where 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] In general, when E(n)<0℃, 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℃, the air conditioner turns on the dehumidification mode 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, and avoids T1 temperature being too low, which makes the compressor dehumidification operation time too short and the dehumidification effect 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 to 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] refer to Figure 8 , the controller is configured as:

[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 when the electric heating device meets the start-up conditions of the electric heating device, the electric heating device is turned on;

[0206] The start-up condition of the electric heating device is: 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;

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

[0208] The first preset temperature difference E1 may be 0° C. The third preset humidity RH3 is 5%.

[0209] After the electric heating device is turned on, the electric heating device runs for at least a fourth preset time t4, wherein the fourth preset time is 5 minutes.

[0210] In some embodiments of the present application, reference Fig. 9 , the controller is configured as:

[0211] 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. 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:

[0212] 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;

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

[0214] After the electric heating device is turned off, the electric heating device must be turned off for at least the fifth preset time before it can be turned on again.

[0215] Among them, the fifth preset time is 2 minutes.

[0216] In some embodiments of the present application, reference Fig.10 , the controller is configured as:

[0217] After the electric heating device is turned off for at least the fifth preset time, a cycle of turning on the electric heating device, turning off the electric heating device, and then turning on the electric heating device is entered.

[0218] When the electric heating device is turned on, it can offset the sensible cooling, so that the room temperature does not drop or drops slightly, and the electric heating device can be operated intermittently, which can suppress the power consumption of the electric heating operation and save energy.

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

[0220] During heating operation, when the electric heating device is turned on, the electric heating indicator light or the icon displayed on the screen lights up, but during dehumidification, in order to avoid user misunderstanding, when the electric heating device is turned on, the electric heating indicator light or the icon displayed on the screen does not light up.

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

[0222] After the compressor runs at the initial frequency for a second preset time t2, periodically determining the frequency of the compressor;

[0223] 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;

[0224] After the compressor frequency of this cycle is determined, the compressor operates at the compressor frequency of this cycle.

[0225] The compressor frequency change dF in this cycle may be a fixed value.

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

[0227] The frequency change dF of the compressor in this cycle can be positive, negative or 0. Fmin≤F(n)≤Fmax, where 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 this cycle is determined according to the set temperature difference E(n) in this cycle and the set temperature difference change rate ΔE in this cycle;

[0229] Among them, 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;

[0230] 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;

[0231] Specifically, the compressor frequency change dF of this cycle is searched in the preset data table (Table 4) according to the set temperature difference E(n) of this cycle and the set temperature difference change rate ΔE of this cycle; if the set temperature difference E(n) of this cycle and the set temperature difference change rate ΔE of this cycle exist in the table, the corresponding compressor frequency change dF is determined by byte; if either the set temperature difference E(n) of this cycle or the set temperature difference change rate ΔE of this cycle does not exist in the preset data table, find the data close to it, and then determine the corresponding compressor frequency change dF.

[0232] Table 4

[0233]

[0234] Among them, the values ​​of a1, a2, a3, a4, and a5 decrease in sequence. The values ​​of a6, a7, a8, and a9 also decrease in sequence.

[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 it will suddenly increase by a thousand to a million times as the temperature rises to a certain temperature (transition temperature), and return to its original state when the temperature drops.

[0237] PTC is the abbreviation of positive temperature coefficient ceramic. 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 and other oxides, and sintered at 1300℃~1350℃. The performance of PTC ceramic varies with room temperature resistivity, temperature transition, resistance temperature coefficient and maximum resistivity.

[0238] During dehumidification, the electric heating device needs to run intermittently and is surrounded by cold air. The heat generated by the electric heating device is automatically adjusted when the device is working, and the surface temperature is constant. There is no safety risk when condensation occurs on the device when the device stops. Therefore, the type of 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=900rpm, dF=5Hz, R=30rpm, t2=10min, t3=5min, t4=5min, t5=2min, t7=5min, T1=32℃, T2=27℃, 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 displayed on the screen.

[0242] Example 1:

[0243] After receiving the dehumidification command, Ts = 25°C, the indoor motor and outdoor motor are controlled to run for t1 = 30s.

[0244] It is detected that Ta(0)=27°C, RH(0)=89%, Tout(0)=26°C, and according to Table 2, RHs=68%.

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

[0246] After 10 minutes, the conditions were detected as Ta=26°C, RH=82%, and F=45Hz.

[0247] Calculated 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=850rpm.

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

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

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

[0252] New cycle,

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

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

[0255] New cycle,

[0256] Detection Ta = 25.3 ° C, RH = 76%, F = 36Hz, calculated 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] Detection Ta = 25.2 ° C, RH = 74%, F = 34Hz, calculated TL = 20.1 ° C,

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

[0261] At this time, F=34Hz>F1=30Hz. According to formula 2, the minimum speed Rmin=R L =700rpm, so the actual R(6) =700rpm.

[0262] New cycle,

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

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

[0265] At this time, F=32Hz>F1=30Hz. According to formula 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%, the electric heating is forced to start, and the electric heating screen icon does not light up.

[0266] Example 2:

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

[0268] It is detected that Ta(0)=26.5°C, RH(0)=84%, Tout(0)=28°C, and according to Table 2, RHs=52%.

[0269] The compressor operates at an initial frequency of F0 = 50 Hz, and the indoor fan operates at an initial speed of R0 = R H =900rpm operation,

[0270] After 10 minutes, the temperature was detected to be Ta=26°C, RH=78%, and F=45Hz.

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

[0272] TL-TLs=21.7-14.3=7.4°C, R(2)=R(1)-R=900-50=850rpm.

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

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

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

[0276] New cycle,

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

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

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

[0280] New cycle,

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

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

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

[0284] New cycle,

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

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

[0287] At this time, E=Ta-Ts=25-25=0°C, and RH>RHs+RH3=52+5=57%, and the electric heating continues to be in the on 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] Detection Ta = 25 ° C, RH = 57%, F = 20Hz, calculated TL = 15.5 ° C,

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

[0295] At this time, E=Ta-Ts=25-25=0°C, and RH>RHs+RH3=52+5=57%, and the electric heating continues to be in the on 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=550 rpm.

[0300] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0301] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0302] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0303] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on 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 casing having an outdoor air inlet; A compressor is disposed in the outdoor casing; An outdoor environment temperature detection device, used to detect the outdoor environment temperature, the outdoor environment temperature detection device is connected to the outdoor housing and is 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, the controller being configured to: After receiving the dehumidification command, Get the set temperature Ts; Get the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n); Determine the set relative humidity RHs according to the current outdoor ambient temperature Tout(n) and the current indoor ambient relative humidity RH(n); Calculate the set temperature difference E(n), where the set temperature difference E(n) 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 controlled to rotate. 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: 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) according to 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: According to the current compressor frequency F(n), the minimum speed Rmin of the indoor fan is determined as follows: 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 ; Wherein, F(n) is the current compressor frequency, F1 is the first preset threshold of the compressor frequency, Fmin is the minimum compressor frequency, and Fmin is the minimum compressor frequency. <F1;R dm The minimum speed allowed for indoor fans, R L The indoor fan has a low speed.

4. The air conditioner according to claim 1, characterized in that: Also includes: An indoor heat exchanger is disposed in the indoor casing and is located on a side of the indoor fan close to the indoor air inlet; An electric heating device, disposed in the indoor casing and 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 condition of the electric heating device, the electric heating device is turned on. The start-up condition of the electric heating device is: 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 environment temperature Ta(n) and the indoor environment 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 frequency of the compressor 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 according to 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, characterized in that: The set 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 preset two-dimensional data set.

9. The air conditioner according to claim 4, characterized in that: The air conditioner also includes: 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 casing having an outdoor air inlet; A compressor is disposed in the outdoor casing; An outdoor environment temperature detection device, used to detect the outdoor environment temperature, the outdoor environment temperature detection device is connected to the outdoor housing and is 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, the controller being configured to: After receiving the dehumidification command, Get the set temperature Ts; Get the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n); Determine the set relative humidity RHs according to the current outdoor ambient temperature Tout(n) and the current indoor ambient relative humidity RH(n); Calculate the set temperature difference E(n), where the set temperature difference E(n) 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 controlled to rotate. 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: 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) according to 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 the indoor fan to be reliable.

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