Air conditioner

Abstract

The air conditioner comprises a controller which is configured to start a compressor when a set temperature difference E (n) is smaller than or equal to a first preset set temperature difference E1, a dew point temperature difference Th (n) is larger than or equal to a first preset dew point temperature difference Th1 and a current outdoor temperature Tout (n) is smaller than or equal to a first preset outdoor temperature Tout 1, the frequency of the compressor is an initial frequency F (0), and the rotating speed of an indoor fan is an initial rotating speed R (0); the indoor air deflector rotates to the low-circulation air volume position so that the air conditioner can be in a low-circulation air volume state; the initial rotating speed R (0) is equal to RL; when the air conditioner is set to perform low-cold-load and high-potential-load dehumidification, the rotating speed of the indoor fan is set to be low, the refrigerating capacity can be reduced, and the dehumidification capacity can be improved; the indoor air deflector rotates to the low-circulation air volume position so that the air conditioner can be in the low-circulation air volume state, the circulation air volume can be reduced, the evaporation temperature can be lowered, the dehumidification effect can be improved, and cold air flow is prevented from being blown to a user.

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, on which an indoor air inlet and an indoor air outlet are provided;

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

[0009] An indoor air guide plate, rotatably connected to the indoor casing to guide the air coming out of the indoor air outlet;

[0010] An outdoor casing having an outdoor air inlet;

[0011] A compressor is disposed in the outdoor casing;

[0012] 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;

[0013] 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;

[0014] A controller, the controller being configured to:

[0015] After receiving the dehumidification command,

[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] 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);

[0018] Get the set temperature Ts and the set humidity RHs;

[0019] Calculate the target dew point temperature TLs according to the set temperature Ts and the set humidity RHs;

[0020] Calculate the set temperature difference E(n) and the dew point temperature difference Th(n), wherein the set temperature difference E(n) is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts, and the dew point temperature difference Th(n) is the difference between the current dew point temperature TL(n) and the target dew point temperature TLs;

[0021] When the set temperature difference E(n) ≤ the first preset set temperature difference E1, the dew point temperature difference Th(n) ≥ the first preset dew point temperature difference Th1 and the current outdoor temperature Tout(n) ≤ the first preset outdoor temperature Tout1 are satisfied at the same time, the compressor is started, the compressor frequency is the initial frequency F(0), the indoor fan speed is the initial speed R(0), and the indoor air guide plate rotates to the low circulation air volume position to put the air conditioner in a low circulation air volume state;

[0022] The initial rotational speed R(0) = RL, where Rdm < RL < RH, Rdm is the lowest reliable allowable rotational speed of the indoor fan, RL is the low rotational speed of the indoor fan, and RH is the high rotational speed of the indoor fan.

[0023] In this application, when the air conditioner enters the low cooling load and high latent load dehumidification mode, the rotational speed of the indoor fan is set to be relatively low, which can reduce the refrigeration capacity and increase the dehumidification capacity; the indoor air deflector is set to rotate to the low circulation air volume position so that the air conditioner is in the low circulation air volume state, which can reduce the circulation air volume, lower the evaporation temperature, improve the dehumidification effect, and prevent the cold air flow from blowing on the user.

[0024] According to an embodiment of the present disclosure, it further includes:

[0025] An indoor heat exchanger, which is arranged inside the indoor housing and on the side of the indoor fan close to the indoor air inlet;

[0026] An electric heating device, which is arranged inside the indoor housing and between the indoor heat exchanger and the indoor fan;

[0027] The controller is configured to:

[0028] After receiving the dehumidification instruction, it real-time detects the outdoor ambient temperature Ta(n), the indoor ambient relative humidity RH(n), and the outdoor ambient temperature Tout(n). When the electric heating device meets the initial opening condition of the electric heating device, the electric heating device is turned on;

[0029] The initial opening condition of the electric heating device is:

[0030] The real-time detected outdoor ambient temperature Tout(n) ≤ the second preset outdoor temperature Tout2, or, the set temperature difference E(n) ≤ the second preset set temperature difference E2 and the real-time detected indoor ambient relative humidity RH(n) ≥ the set humidity RHs + the first preset humidity RH1;

[0031] Wherein, the set temperature difference E(n) is the difference between the real-time detected indoor ambient temperature Ta(n) and the set temperature Ts.

[0032] An electric heating device is provided. After the electric heating device is turned on, it can offset the sensible cooling capacity and make the room temperature not drop or drop slightly.

[0033] According to an embodiment of the present disclosure, when the electric heating device is turned on, when the maximum rotational speed of the indoor fan is greater than k*RL, the rotational speed of the indoor fan is set to k*RL, and the coefficient k ∈ (0.0, 1.0). Setting the maximum rotational speed of the indoor fan to be limited when the electric heating device is turned on can avoid generating a large whistling sound.

[0034] According to an embodiment of the present disclosure, after the compressor runs at the initial frequency for a second preset time, the rotation speed of the indoor fan is periodically determined according to the weight ratio;

[0035] In each indoor fan speed determination cycle, the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n) are obtained;

[0036] 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);

[0037] Get the set temperature Ts and the set humidity RHs;

[0038] Calculate the target dew point temperature TLs according to the set temperature Ts and the set humidity RHs;

[0039] When │TL(n)-TLs│≤1.0, the weight ratio i=0, and when │TL(n)-TLs│>1.0, the weight ratio i=int(TL-TLs), where int is rounded down;

[0040] The indoor fan speed R(n) of this cycle = the previous fan speed R(n-1)-i*R, where R is the first preset speed;

[0041] Determine whether the indoor fan speed R(n) of this cycle is lower than the minimum allowable reliable operation speed Rdm of the indoor fan. If yes, the indoor fan speed R(n) of this cycle = Rdm, and the indoor fan runs at the indoor fan speed of this cycle. If no, determine whether the electric heating device is running.

[0042] When the electric heating device is not running, it is determined whether the indoor fan speed R(n) of this cycle is higher than the indoor fan high speed RH. If yes, the indoor fan speed R(n) of this cycle = RH, and the indoor fan runs at the indoor fan speed of this cycle. If no, the indoor fan runs at the indoor fan speed of this cycle.

[0043] When the electric heating device is running, it is determined whether the indoor fan speed R(n) of this cycle is higher than k*RL, with the coefficient k∈(0.0, 1.0). If it is, the indoor fan speed R(n) of this cycle is equal to k*RL, and the indoor fan runs at the indoor fan speed of this cycle. If it is not, the indoor fan runs at the indoor fan speed of this cycle.

[0044] Among them, Rdm <RL<RH。

[0045] In dehumidification mode, when the electric heating is working, the indoor motor must be forced to be controlled below k*RL to avoid generating loud howling sounds.

[0046] According to an embodiment of the present disclosure, the method for determining the set temperature Ts is specifically as follows:

[0047] If Ta(n)-T 用 s>0℃, then Ts=T 用 s;

[0048] If Ta(n)-T 用 s≤0℃, then Ts=Ta(n)-T1;

[0049] Where Ta(n) is the current indoor ambient temperature, T 用 s is the user set temperature, and T1 is the first preset temperature, which enables the compressor to start.

[0050] According to an embodiment of the present disclosure, the controller includes an indoor controller and an outdoor controller, the indoor controller is arranged in the indoor casing; the outdoor controller is arranged in the outdoor casing;

[0051] The air conditioner also includes:

[0052] An indoor heat exchanger temperature detection device, which is arranged on the indoor heat exchanger and is used to detect the coil temperature Te_in of the indoor heat exchanger;

[0053] After the electric heating device is turned on, the indoor controller will detect the indoor heat exchanger coil temperature Te_in plus the third preset temperature T3 and send it to the outdoor controller. The indoor heat exchanger coil temperature Te_out received by the outdoor controller is Te_in=Te_in+T3, and the outdoor controller performs freezing protection on the indoor heat exchanger according to Te_out.

[0054] According to an embodiment of the present disclosure, the controller is configured to:

[0055] After the electric heating device is turned on for at least a fourth preset time, the indoor ambient temperature Ta(n), the indoor ambient relative humidity RH(n) and the outdoor ambient temperature Tout(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:

[0056] Dew point temperature TL(n)-target dew point temperature TLs≤second preset dew point temperature difference Th2 or continuous opening time of the electric heating device≥sixth preset time t6,

[0057] The current dew point temperature TL(n) is calculated based on the real-time detected indoor environment temperature Ta(n) and the indoor environment relative humidity RH(n); and the target dew point temperature TLs is calculated based on the set temperature Ts and the set humidity RHs.

[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 will not light up to avoid misunderstanding by the user.

[0061] According to an embodiment of the present disclosure, the electric heating device is a PTC ceramic electric heating device.

[0062] According to an embodiment of the present disclosure, an air conditioner is also provided, comprising:

[0063] An indoor casing, on which an indoor air inlet and an indoor air outlet are provided;

[0064] An indoor fan, disposed in the indoor casing;

[0065] An indoor air guide plate, rotatably connected to the indoor casing to guide the air coming out of the indoor air outlet;

[0066] An outdoor casing having an outdoor air inlet;

[0067] A compressor is disposed in the outdoor casing;

[0068] 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;

[0069] 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;

[0070] A controller, the controller being configured to:

[0071] After receiving the dehumidification command,

[0072] Get the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n);

[0073] 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);

[0074] Get the set temperature Ts and the set humidity RHs;

[0075] Calculate the target dew point temperature TLs according to the set temperature Ts and the set humidity RHs;

[0076] Calculate the set temperature difference E(n) and the dew point temperature difference Th(n). The set temperature difference E(n) is the difference between the current indoor environmental temperature Ta(n) and the set temperature Ts, and the dew point temperature difference Th(n) is the difference between the current dew point temperature TL(n) and the target dew point temperature TLs;

[0077] When the set temperature difference E(n) ≤ the first preset set temperature difference E1, the dew point temperature difference Th(n) ≥ the first preset dew point temperature difference Th1, and the current outdoor temperature Tout(n) ≤ the first preset outdoor temperature Tout1 are simultaneously satisfied, the compressor starts, the compressor frequency is the initial frequency F(0), the indoor fan speed is the initial speed R(0), and the indoor air deflector rotates to the low circulation air volume position to make the air conditioner in the low circulation air volume state;

[0078] The initial speed R(0) = RL, where Rdm < RL < RH, where Rdm is the reliable allowable minimum speed of the indoor fan, RL is the low speed of the indoor fan, and RH is the high speed of the indoor fan;

[0079] The initial frequency F(0) = F0, where Fmin < F0 < Fmax, Fmin is the minimum frequency of the compressor, and Fmax is the maximum frequency of the compressor. Description of the Drawings

[0080] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0081] Figure 1 is a cross-sectional view of an air conditioner according to an embodiment of the present application;

[0082] Figure 2 is a partial dehumidification flowchart of an air conditioner according to an embodiment of the present application;

[0083] Figure 3 is an initial start-up flowchart of an electric heating device of an air conditioner according to an embodiment of the present application;

[0084] Figure 4 is a shutdown flowchart of an electric heating device of an air conditioner according to an embodiment of the present application;

[0085] Figure 5 is a flowchart for restarting the electric heating device of an air conditioner according to an embodiment of the present application;

[0086] Figure 6is a flow chart of a cycle of shutting down and restarting an electric heating device of an air conditioner according to an embodiment of the present application;

[0087] Figure 7 is another flow chart of an air conditioner according to an embodiment of the present application;

[0088] Figure 8 is another flow chart of an air conditioner according to an embodiment of the present application;

[0089] Fig. 9 is another flow chart of an air conditioner according to an embodiment of the present application;

[0090] Fig.10 is another flow chart of an air conditioner according to an embodiment of the present application;

[0091] Fig.11 is a schematic diagram of an air guide plate of an air conditioner in a low circulation air volume position according to an embodiment of the present application;

[0092] Fig.12 is another cross-sectional view of an air conditioner according to an embodiment of the present application;

[0093] Fig.13 4 is a flow chart of determining Ts by the air conditioner according to an embodiment 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 13 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, 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 relevant parameters, 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 driving motors of the indoor fan, outdoor fan, compressor, four-way valve, expansion valve, outdoor environment temperature detection device, indoor environment detection device, and indoor air guide plate. The controller can receive the values ​​detected by the outdoor environment temperature detection device and the indoor environment detection device, and control the working states of the indoor fan, outdoor fan, compressor, and indoor air guide plate 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 , the controller is configured as:

[0131] After receiving the dehumidification command,

[0132] Get the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n);

[0133] 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);

[0134] Obtain the set temperature Ts and the set humidity RHs;

[0135] Calculate the target dew point temperature TLs according to the set temperature Ts and the set humidity RHs;

[0136] Calculate the set temperature difference E(n) and the dew point temperature difference Th(n), where the set temperature difference E(n) is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts, and the dew point temperature difference Th(n) is the difference between the current dew point temperature TL(n) and the target dew point temperature TLs;

[0137] When the set temperature difference E(n) ≤ the first preset set temperature difference E1, the dew point temperature difference Th(n) ≥ the first preset dew point temperature difference Th1, and the current outdoor temperature Tout(n) ≤ the first preset outdoor temperature Tout1 are satisfied simultaneously, the compressor starts, the compressor frequency is the initial frequency F(0), the indoor fan speed is the initial speed R(0), and the indoor air deflector rotates to the low circulation air volume position so that the air conditioner is in the low circulation air volume state.

[0138] Among them, the dew point temperature TL = f(Ta, RH), where the calculation methods of the current dew point temperature and the target dew point temperature are the same.

[0139] Among them, E(n) = Ta(n) - Ts, Th(n) = TL(n) - TLs.

[0140] Among them, n is a natural number ≥ 1. The first preset set temperature difference E1 generally takes any value in 0.0 °C - 5 °C, the first preset dew point temperature difference Th1 generally takes any value in 5 °C - 20 °C, and the first preset outdoor temperature Tout1 generally takes any value in 18 °C - 30 °C.

[0141] Among them, the initial frequency F(0) = F0, where Fmin < F0 < Fmax, where Fmin is the minimum frequency of the compressor and Fmax is the maximum frequency of the compressor.

[0142] Among them, the initial speed R(0) = RL, where Rdm < RL < RM < RH, where Rdm is the reliable allowable minimum speed of the indoor fan, RL is the low speed of the indoor fan, RM is the medium speed of the indoor fan, and RH is the high speed of the indoor fan.

[0143] Specifically, Q 总 = Q 显 + Q 潜 ,Q 显 Controls the change of temperature, Q 潜 Controls the moisture content or dew point temperature of the air. When Q 显 = 0, that is, there is no refrigerating 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.

[0144] 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 isohumidification. If it decreases, it means dehumidification. If the air humidity at state point A is 20g / kg, the air humidity at state point B is 10g / kg, the air density is 1.169kg / m3, and the air volume in the room is 20m3, then the actual dehumidification amount of the room air from state point A to state point B = (20g / kg-10g / kg)*1.169kg / m3*20m3 = 233.8g.

[0145] The current dew point temperature is the dew point temperature determined by the current actual temperature and relative humidity. The target dew point temperature is the dew point temperature determined by the set temperature and set relative humidity when the set temperature and set relative humidity are reached. The greater the difference between the current dew point temperature and the target dew point temperature, the greater the dehumidification demand.

[0146] When the set temperature difference E(n) ≤ the first preset set temperature difference E1, the dew point temperature difference Th(n) ≥ the first preset dew point temperature difference Th1 and the current outdoor temperature Tout(n) ≤ the first preset outdoor temperature Tout1 are satisfied at the same time, it indicates that the air conditioner enters the low cooling load and high latent load dehumidification. Since the cooling load is very low or even 0W, the compressor needs to run at the minimum frequency. If the compressor frequency is low, the evaporation temperature will be high, and there will be no dehumidification capacity; and because the latent load is high, the wind speed caused by the indoor fan needs to be as low as possible, that is, the air conditioner Q is reduced. 显 (cooling capacity) output, and increase Q 潜 (dehumidification capacity), therefore, the compressor frequency is set to the initial frequency F0 and the indoor fan speed is set to the initial speed RL.

[0147] Since the speed of the indoor fan is low, in order to effectively dehumidify, the evaporation temperature is low, so the air outlet temperature of the indoor air outlet is also low. On the other hand, the expected speed of the indoor fan is below 300rpm. After all, it is limited by the minimum allowable reliable speed. The actual speed of the indoor fan cannot be too low. For example, the minimum allowable reliable speed Rdm of a general indoor fan is 400rpm. At this time, the air volume is relatively high, the evaporation temperature is not low enough, and the latent heat ratio rises limitedly. Therefore, the indoor air guide plate is also set to rotate to a low circulation air volume position to put the air conditioner in a low circulation air volume state, which can reduce the circulation air volume, reduce the evaporation temperature, improve the dehumidification effect, and prevent the cold air flow from blowing on the user. Among them, the indoor air guide plate is controlled to the position where it is least likely to be discharged, that is, the angle where the circulation air volume of the air conditioner indoor unit is the smallest, and the dehumidification effect is optimal.

[0148] In the present application, when the air conditioner is set to enter low cooling load and high latent load dehumidification, the speed of the indoor fan is set to be lower, which can reduce the cooling capacity and increase the dehumidification capacity; the indoor air guide plate is set to rotate to a low circulation air volume position to put the air conditioner in a low circulation air volume state, which can reduce the circulation air volume, lower the evaporation temperature, improve the dehumidification effect, and prevent the cold air flow from blowing onto the user.

[0149] In some embodiments of the present application, the controller is further configured to:

[0150] After receiving the dehumidification command, determine whether the indoor fan and the outdoor fan have been running for more than the first preset time t1 within a certain period of time before the current time. If not, the compressor does not work, first control the indoor fan and the outdoor fan to rotate and run for the first preset time, and then obtain the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n). If yes, directly obtain the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n). Setting the compressor not to work and the indoor fan and the outdoor fan to rotate can eliminate the radiation effect and obtain the real indoor ambient temperature and outdoor ambient temperature.

[0151] Before obtaining the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n), the indoor fan and the outdoor fan are rotated to eliminate the radiation effect and make the air flow, so as to obtain the real indoor ambient temperature, indoor ambient humidity and outdoor ambient temperature.

[0152] Among them, 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 radiation influence can be eliminated to avoid inaccurate indoor ambient temperature, indoor ambient humidity and outdoor ambient temperature.

[0153] 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.

[0154] 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.

[0155] The air conditioner further comprises a remote controller for an indoor unit of the air conditioner, wherein the set humidity RHs can be set by using the remote controller.

[0156] The set temperature Ts is the temperature set for dehumidification. The set temperature Ts is based on the user set temperature T 用 s, the user sets the temperature T 用 s can be set using the remote control.

[0157] refer to Fig.13 , the method for determining the set temperature Ts is specifically as follows:

[0158] If Ta(n)-T 用 s>0℃, then Ts=T 用 s;

[0159] If Ta(n)-T 用 s≤0°C, then Ts=Ta(n)-T1, where T1 is the first preset temperature.

[0160] 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.

[0161] Generally, when E(n) is less than 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 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.

[0162] 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.

[0163] In some embodiments of the present application, reference Figure 3 The air conditioner further comprises an electric heating device 31, wherein the electric heating device is arranged in the indoor casing, and the electric heating device is located between the indoor heat exchanger and the indoor fan.

[0164] 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.

[0165] The controller is configured as:

[0166] After receiving the dehumidification instruction, the outdoor environment temperature Ta(n), the indoor environment relative humidity RH(n) and the outdoor environment temperature Tout(n) are detected in real time, and when the electric heating device meets the initial start-up conditions of the electric heating device, the electric heating device is turned on;

[0167] The initial start-up conditions of the electric heating device are:

[0168] When the real-time detected outdoor environment temperature Tout(n) ≤ the second preset outdoor temperature Tout2, or the set temperature difference E(n) ≤ the second preset set temperature difference E2 and the real-time detected indoor environment relative humidity RH(n) ≥ the set humidity RHs+the first preset humidity RH1;

[0169] The set temperature difference E(n) is the difference between the real-time detected indoor ambient temperature Ta(n) and the set temperature Ts.

[0170] The second preset outdoor temperature Tout2 is 10° C.-25° C. The second preset temperature difference E2 may be 0.5° C. The first preset humidity RH1 is 10%.

[0171] After the electric heating device is turned on, the electric heating device operates for at least a fourth preset time t4.

[0172] Among them, the fourth preset time is 5 minutes.

[0173] An electric heating device is installed. When turned on, it can offset the sensible cooling and keep the room temperature from dropping or drop slightly.

[0174] The controller is configured to: when the electric heating device is turned on, when the maximum speed of the indoor fan is greater than k*RL, the speed of the indoor fan is k*RL, and the coefficient k∈(0.0, 1.0). Setting the maximum speed of the indoor fan to be limited when the electric heating device is turned on can avoid generating a loud whistling sound.

[0175] In some embodiments of the present application, reference Figure 4 , the controller is configured to:

[0176] After the electric heating device is turned on for at least a fourth preset time, the indoor ambient temperature Ta(n), the indoor ambient relative humidity RH(n) and the outdoor ambient temperature Tout(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:

[0177] Dew point temperature TL(n)-target dew point temperature TLs≤second preset dew point temperature difference Th2 or continuous opening time of the electric heating device≥sixth preset time t6,

[0178] The current dew point temperature TL(n) is calculated based on the real-time detected indoor environment temperature Ta(n) and the indoor environment relative humidity RH(n); the target dew point temperature TLs is calculated based on the set temperature Ts and the set humidity RHs;

[0179] The sixth preset time t6 may be 30 minutes.

[0180] In some embodiments of the present application, reference Figure 5 , the controller is configured to:

[0181] After the electric heating device is turned off, the indoor ambient temperature Ta(n), the indoor ambient relative humidity RH(n) and the outdoor ambient temperature Tout(n) are detected in real time, and when the electric heating device meets the conditions for turning on the electric heating device again, the electric heating device is turned on;

[0182] The conditions for restarting the electric heating device are:

[0183] The electric heating device is continuously turned off for at least a fifth preset time t5 and TL(n)-TLs>the second preset temperature T2;

[0184] The current dew point temperature TL(n) is calculated based on the real-time detected indoor environment temperature Ta(n) and the indoor environment relative humidity RH(n); the target dew point temperature TLs is calculated based on the set temperature Ts and the set humidity RHs;

[0185] The second preset temperature T2 may be 1° C. The fifth preset time t5 may be 2 minutes.

[0186] After the electric heating device is turned on again, the electric heating device is turned on for at least a fourth preset time;

[0187] refer to Figure 6 After the electric heating device is turned on for at least the fourth preset time, the electric heating device enters a cycle of judging whether to turn off, judging whether to turn on again, and judging whether to turn off, which can realize intermittent operation of the electric heating device and suppress power consumption of electric heating operation.

[0188] In some embodiments of the present application, the air conditioner also includes an electric heating indicator light or icon.

[0189] 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 in dehumidification mode, 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.

[0190] In some embodiments of the present application, the controller includes an indoor controller and an outdoor controller, wherein the indoor controller is disposed in the indoor casing; and the outdoor controller is disposed in the outdoor casing.

[0191] The air conditioner also includes an indoor heat exchanger temperature detection device, which is used to detect the coil temperature Te_in of the indoor heat exchanger. The indoor heat exchanger temperature detection device is arranged on the indoor heat exchanger.

[0192] Since the electric heating device is turned on, the cooling load is increased, the compressor frequency rises, and the evaporation temperature is reduced to achieve a large dehumidification amount. The evaporation temperature may be reduced to trigger the freezing and frequency reduction protection. Therefore, after the electric heating device is turned on, the indoor controller will detect the indoor heat exchanger coil temperature Te_in plus the third preset temperature T3 and send it to the outdoor controller. The indoor heat exchanger coil temperature Te_out received by the outdoor controller is Te_in+T3. The outdoor controller performs freezing protection on the indoor heat exchanger according to Te_out to avoid or reduce the triggering of freezing protection, thereby ensuring that the indoor heat exchanger is not frosted or frozen and effectively dehumidifying.

[0193] Te_out=Te_in+T3>Te0 (Te0 is the freezing protection frequency reduction temperature), and the freezing frequency reduction protection is not triggered.

[0194] T3<Te0 (Te0 is the freezing protection frequency reduction temperature)-T4 (T4 is the critical temperature of frost and ice, generally 1-2℃). If Te0=6℃, T4=1℃, then the maximum setting of T3 is 6-1=5℃, and the minimum setting of T3 is 1℃. Therefore, T3 can be any value between 1℃-5℃.

[0195] In some embodiments of the present application, reference Figure 7 , the controller is configured as:

[0196] After the compressor runs at the initial frequency for a second preset time t2, periodically determining the frequency of the compressor;

[0197] 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;

[0198] After the compressor frequency of this cycle is determined, the compressor operates at the compressor frequency of this cycle.

[0199] The compressor frequency change dF in this cycle may be a fixed value.

[0200] 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.

[0201] 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.

[0202] 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;

[0203] 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;

[0204] 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;

[0205] Specifically, the compressor frequency change dF of this cycle is searched in the preset data table (Table 1) 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.

[0206] Table 1

[0207]

[0208]

[0209] 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.

[0210] In some implementations of this application, reference Figure 8-Figure 10 , after the compressor runs at the initial frequency for a second preset time t2, the speed of the indoor fan is periodically determined according to the weight ratio;

[0211] In each indoor fan speed determination cycle, the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n) are obtained;

[0212] 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);

[0213] Get the set temperature Ts and the set humidity RHs;

[0214] Calculate the target dew point temperature TLs according to the set temperature Ts and the set humidity RHs;

[0215] When │TL(n)-TLs│≤1.0, the weight ratio i=0, and when │TL(n)-TLs│>1.0, the weight ratio i=int(TL-TLs), where int is rounded down (i is an integer and can be positive or negative);

[0216] The indoor fan speed R(n) in this cycle = the previous fan speed R(n - 1) - i*R, where R is the first preset speed;

[0217] Judge whether the indoor fan speed R(n) in this cycle is lower than the minimum allowable reliable operating speed Rdm of the indoor fan. When it is yes, the indoor fan speed R(n) in this cycle = Rdm, and the indoor fan operates at the indoor fan speed in this cycle. When it is no, judge whether the electric heating device is operating.

[0218] When the electric heating device is not operating, judge whether the indoor fan speed R(n) in this cycle is higher than the high speed RH of the indoor fan. When it is yes, the indoor fan speed R(n) in this cycle = RH, and the indoor fan operates at the indoor fan speed in this cycle. When it is no, the indoor fan operates at the indoor fan speed in this cycle;

[0219] When the electric heating device is operating, judge whether the indoor fan speed R(n) in this cycle is higher than k*RL, where the coefficient k ∈ (0.0, 1.0). When it is yes, the indoor fan speed R(n) in this cycle = k*RL, and the indoor fan operates at the indoor fan speed in this cycle. When it is no, the indoor fan operates at the indoor fan speed in this cycle;

[0220] Among them, Rdm < RL < RH, and RL can be more than twice of Rdm.

[0221] Among them, the cycle for determining the indoor fan speed is the third preset time t3.

[0222] Specifically, the heat generated by the electric heating device diffuses into the air duct through heat transfer, causing the air temperature in the air duct to rise and form a hot air flow. After the hot air flow passes through the intake area of the indoor fan blades, the air flow temperature difference at each position on the blade surface at the inlet of the entire indoor fan is too large, the fluid physical property parameters, and the inlet attack angle change, and the air flow velocity distribution in the intake area of the indoor fan blades is extremely uneven. The air flow on the blade surface of the indoor fan blades separates and generates vortices, which may lead to the deterioration of the fan noise and the generation of whistling sounds. When the heating operation heating capacity is insufficient, the electric heating device is used to supplement the heating capacity. During the heating operation, the air flow temperature is high, and actually the whistling sound is small and easy to solve. During dehumidification, the low-temperature air flow after passing through the indoor heat exchanger blows onto the surface of the high-temperature electric heating device, and the air flow temperature changes suddenly, inevitably generating a whistling sound, and this whistling sound is strongly related to the speed of the indoor fan. The higher the speed, the more obvious the whistling noise. Therefore, in the dehumidification mode, when the electric heating is working, it is necessary to forcibly control the indoor motor below k*RL to avoid generating a large whistling sound.

[0223] The third preset time t3 can be 5 min. The initial speed R is 10 rpm.

[0224] In some embodiments of the present application, refer to Figure 11-Figure 12During the swinging process of the indoor air guide plate, the minimum rotation angle of the indoor air guide plate is A, the maximum rotation angle of the indoor air guide plate is B, B>A>0°, when the indoor air guide plate is in the low circulation air volume position, the rotation angle of the indoor air guide plate is C, wherein A+α≥C≥A or B≥C≥B-α, wherein α can be 10°C.

[0225] The indoor air guide plate includes a transverse air guide plate and a longitudinal air guide plate, wherein the transverse large air guide plate swings up and down, and the longitudinal air guide plate swings toward the two side ends of the air conditioner indoor unit.

[0226] When the air-conditioning indoor unit is a wall-mounted air-conditioning indoor unit, the transverse air guide plate is used to open or close the indoor air outlet. When the transverse air guide plate closes the indoor outlet, the rotation angle of the transverse air guide plate is 0°, the minimum rotation angle of the transverse air guide plate is A, the maximum rotation angle of the transverse air guide plate is B, B>A>0°, and when the transverse air guide plate is in a low circulation air volume position, the rotation angle of the transverse air guide plate is C, wherein A+10°≥C≥A or B≥C≥B-10°.

[0227] Among them, when the air-conditioning indoor unit is a wall-mounted air-conditioning indoor unit and the indoor air guide plate is a transverse air guide plate, when the rotation angle of the transverse air guide plate is A or B, the circulating air volume of the indoor air conditioner is minimized.

[0228] When the air conditioner indoor unit is a wall-mounted air conditioner indoor unit, the longitudinal air guide plate is arranged on the inner side of the transverse air guide plate, and when the longitudinal air guide plate swings to two extreme positions, the circulating air volume of the indoor air conditioner is minimized.

[0229] When the indoor unit of the air conditioner is a cabinet unit, the longitudinal air guide plate is used to close the indoor air outlet, and the transverse air guide plate is arranged on the inner side of the longitudinal air guide plate.

[0230] 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".

[0231] 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.

[0232] 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.

[0233] 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.

[0234] In some embodiments of the present application, the parameters of the air conditioner are set as follows:

[0235] The first preset time t1 = 30s,

[0236] The first preset temperature T1 = 1.5°C,

[0237] The first preset temperature difference E1 = 3°C, the second preset temperature difference E2 = 0.5°C,

[0238] The first preset dew point temperature difference Th1 = 10°C, the second preset dew point temperature difference Th2 = 1°C,

[0239] The minimum frequency of the compressor is Fmin = 10Hz, the maximum frequency of the compressor is Fmax = 80Hz, and the initial frequency is F0 = 30Hz.

[0240] The first preset outdoor temperature Tout1 = 30°C, the second preset outdoor temperature Tout2 = 24°C,

[0241] Rmin=400rpm, RH=1000rpm, RL=700rpm, dF=-5Hz, first preset speed R=10rpm, k=0.8, t2=10min, t3=5min, t4=5min, t5=2min, t6=30min, t7=5min,

[0242] T3=3℃, RH1=10%, Te0=6℃.

[0243] The electric heating type is PTC type, and the electric heating icon is displayed on the screen.

[0244] Example 1:

[0245] Receive dehumidification signal,

[0246] T 用 s=25℃,RHs=55%,Indoor motor and outdoor motor rotate, control indoor motor and outdoor motor to run t1=30s first,

[0247] The detection values ​​were Ta(0)=27°C, RH(0)=86%, and Tout(0)=28°C.

[0248] Ta(0)=27℃>T 用 s=25℃, so Ts=T 用 s=25℃。

[0249] It was calculated that TL(0)=24.3°C and TLs=15.2°C.

[0250] E(0)=Ta(0)-Ts=27-25=2℃>0℃, the compressor starts,

[0251] F(0)=F0=30Hz, R(0)=RL=700rpm, the indoor air guide plate is controlled to the position where it is least likely to blow out air;

[0252] After the compressor runs for t2=10min,

[0253] Detect Ta(n) = 26°C, RH(n) = 78%, calculate TL = 21.7°C, at this time F(n) = 25Hz,

[0254] Calculate the weight ratio i=int(TL-TLs)=int(21.7-15.2)=6, R(1)=R(0)-6*R=700-6*10=640rpm.

[0255] New testing cycle,

[0256] Ta(n+1)=25.5℃,RH(n+1)=71%,TL=19.7℃,F(n)=20Hz,

[0257] Calculate the weight ratio i=int(TL-TLs)=int(19.7-15.2)=4, R(2)=R(1)-i*R=640-4*10=600rpm,

[0258] At this time, E(n+1)=E2=0.5℃, and RH(n+1)=71%≥RHS+RH=55%+10%=65%, the electric heating is forced to turn on, and the icon on the electric heating screen does not light up. At this time, R(2)=600rpm>k*RL=0.8*700rpm=560rpm, that is, R(2) is forced to be 560rpm.

[0259] New testing cycle,

[0260] Ta(n+1)=25℃, RH(n+1)=58%, TL=16.2℃, F(n)=15Hz, │TL-TLs│=│16.2-15.2│=1, so i=0, R(3)=R(2)+0*10=560rpm. At this time, TL-TLs=1℃=Th2, and the electric heating on time>t4=5min, the electric heating exit condition is met, and the electric heating is turned off.

[0261] Example 2:

[0262] Receive dehumidification mode, T用 s = 25°C, RHs = 55%, the indoor motor and the outdoor motor rotate. Control the indoor motor and the outdoor motor to run first for t1 = 30 s,

[0263] Detect Ta(0) = 24°C, RH(0) = 86%, Tout(0) = 20°C. Ta(0) = 24°C < T 用 s = 25°C, so Ts = Ta(0) - T1 = 24 - 1.5 = 22.5°C.

[0264] Calculate TL(0) = 21.3°C, TLs = 12.8°C.

[0265] E(0) = Ta(0) - Ts = 24 - 22.5 = 1.5°C > 0°C, the compressor starts.

[0266] F(0) = F0 = 30 Hz, R(0) = RL = 700 rpm, the indoor air deflector is controlled to the position where the air is least likely to come out. Since Tout(0) = 20°C < Tout2 = 24°C, the electric heating is also forced to turn on, and the electric heating display icon is not lit. Since R(0) = R 低 = 700 rpm > k * RL = 0.8 * 700 rpm = 560 rpm, that is, force R(0) = 560 rpm.

[0267] After the compressor runs for t2 = 10 min,

[0268] Detect Ta(n) = 23°C, RH(n) = 77%, Te_in = 5°C, calculate TL = 19.6°C, the outdoor Te_out = Te_in + T3 = 5 + 3 = 8°C > Te0 = 6°C, the freeze and frequency reduction protection is not triggered. Detect that F(n) = 25 Hz at this time, calculate the weight ratio i = int(TL - TLs) = int(19.6 - 12.8) = 6, R(1) = R(0) - i * R = 560 - 6 * 10 = 500 rpm.

[0269] New detection cycle,

[0270] Ta(n + 1) = 22°C, RH(n + 1) = 67%, calculate TL = 15.4°C,

[0271] At this time, F(n) = 20 Hz, calculate the weight ratio i = int(TL - TLs) = int(15.4 - 12.8) = 2, R(2) = R(1) - i * R = 500 - 2 * 10 = 480 rpm.

[0272] New detection cycle,

[0273] Ta(n + 1) = 22°C, RH(n + 1) = 58%, calculate TL = 13.5°C,

[0274] At this time, F(n) = 20 Hz. At this time, │TL - TLs│ = │13.5 - 12.8│ = 0.7. Therefore, i = 0, and R(3) = R(2) - 0 * 10 = 480 rpm.

[0275] At this time, TL - TLs = 0.7 °C < Th2 = 1 °C, which meets the condition for the electric heating to turn off. Turn off the electric heating.

[0276] A new detection cycle

[0277] Ta(n + 1) = 21.5 °C, RH(n + 1) = 72%. Calculate TL = 16.1 °C.

[0278] At this time, F(n) = 15 Hz. At this time, i = int(TL - TLs) = int(19.6 - 12.8) = 6, and R(4) = R(2) - 6 * 10 = 420 rpm.

[0279] At this time, E = -1 °C < E2, RH > RHs + RH, and the electric heating stop time > t5, which meets the condition for the electric heating to turn on. Turn on the electric heating again.

[0280] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation of the present invention.

[0281] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0282] 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 may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0283] 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, on which an indoor air inlet and an indoor air outlet are provided; An indoor fan, disposed in the indoor casing; An indoor air guide plate, rotatably connected to the indoor casing to guide the air coming out of the indoor air outlet; 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 current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(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); Get the set temperature Ts and the set humidity RHs; Calculate the target dew point temperature TLs according to the set temperature Ts and the set humidity RHs; Calculate the set temperature difference E(n) and the dew point temperature difference Th(n), wherein the set temperature difference E(n) is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts, and the dew point temperature difference Th(n) is the difference between the current dew point temperature TL(n) and the target dew point temperature TLs; When the set temperature difference E(n) ≤ the first preset set temperature difference E1, the dew point temperature difference Th(n) ≥ the first preset dew point temperature difference Th1 and the current outdoor temperature Tout(n) ≤ the first preset outdoor temperature Tout1 are satisfied at the same time, the compressor is started, the compressor frequency is the initial frequency F(0), the indoor fan speed is the initial speed R(0), and the indoor air guide plate rotates to the low circulation air volume position to put the air conditioner in a low circulation air volume state; Initial speed R(0) = R L , where R dm <R L <R H , where R dm The minimum speed allowed for indoor fans, R L The indoor fan has a low speed, R H Indoor fan high speed.

2. 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 outdoor environment temperature Ta(n), the indoor environment relative humidity RH(n) and the outdoor environment temperature Tout(n) are detected in real time, and when the electric heating device meets the initial start-up conditions of the electric heating device, the electric heating device is turned on; The initial start-up conditions of the electric heating device are: When the real-time detected outdoor environment temperature Tout(n) ≤ the second preset outdoor temperature Tout2, or the set temperature difference E(n) ≤ the second preset set temperature difference E2 and the real-time detected indoor environment relative humidity RH(n) ≥ the set humidity RHs+the first preset humidity RH1; The set temperature difference E(n) is the difference between the real-time detected indoor ambient temperature Ta(n) and the set temperature Ts.

3. The air conditioner according to claim 2, characterized in that: When the electric heating device is turned on, the maximum speed of the indoor fan is greater than k*R L When the indoor fan speed is k*R L , coefficient k∈(0.0, 1.0).

4. The air conditioner according to claim 3, characterized in that: After the compressor runs at the initial frequency for a second preset time, the speed of the indoor fan is periodically determined according to the weight ratio; In each indoor fan speed determination cycle, the current indoor ambient temperature Ta(n), the current indoor ambient relative humidity RH(n) and the current outdoor ambient temperature Tout(n) are obtained; 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); Get the set temperature Ts and the set humidity RHs; Calculate the target dew point temperature TLs according to the set temperature Ts and the set humidity RHs; When │TL(n)-TLs│≤1.0, the weight ratio i=0, and when │TL(n)-TLs│>1.0, the weight ratio i=int(TL-TLs), where int is rounded down; The indoor fan speed R(n) of this cycle = the previous fan speed R(n-1)-i*R, where R is the first preset speed; Determine whether the indoor fan speed R(n) in this cycle is lower than the minimum allowable reliable operating speed R of the indoor fan dm , when it is yes, the indoor fan speed R(n) = R dm , the indoor fan runs at the indoor fan speed of this cycle. When it is no, determine whether the electric heating device is running. When the electric heating device is not running, determine whether the indoor fan speed R(n) in this cycle is higher than the indoor fan high speed R H , when it is yes, the indoor fan speed R(n) = R H , the indoor fan runs at the indoor fan speed of this cycle. When it is no, the indoor fan runs at the indoor fan speed of this cycle. When the electric heating device is running, determine whether the indoor fan speed R(n) in this cycle is higher than k*R L , coefficient k∈(0.0,1.0), when it is yes, the indoor fan speed R(n)=k*R L , the indoor fan runs at the indoor fan speed of this cycle. When it is no, the indoor fan runs at the indoor fan speed of this cycle. Among them, R dm <R L <R H .

5. The air conditioner according to claim 1, characterized in that: The method for determining the set temperature Ts is specifically as follows: If Ta(n) - T 用 s > 0 °C, then Ts = T 用 s; Ta(n)-T 用 s≤0℃,then Ts=Ta(n)-T1; Where Ta(n) is the current indoor ambient temperature, T 用 s is the user set temperature, and T1 is the first preset temperature.

6. The air conditioner according to claim 2, characterized in that: The controller includes an indoor controller and an outdoor controller, wherein the indoor controller is arranged in the indoor casing; the outdoor controller is arranged in the outdoor casing; The air conditioner also includes: An indoor heat exchanger temperature detection device, which is arranged on the indoor heat exchanger and is used to detect the coil temperature Te_in of the indoor heat exchanger; After the electric heating device is turned on, the indoor controller will detect the indoor heat exchanger coil temperature Te_in plus the third preset temperature T3 and send it to the outdoor controller. The indoor heat exchanger coil temperature Te_out received by the outdoor controller is Te_in=Te_in+T3, and the outdoor controller performs freezing protection on the indoor heat exchanger according to Te_out.

7. The air conditioner according to claim 2, 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), the indoor ambient relative humidity RH(n) and the outdoor ambient temperature Tout(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: Dew point temperature TL(n)-target dew point temperature TLs≤second preset dew point temperature difference Th2 or continuous opening time of the electric heating device≥sixth preset time t6, The current dew point temperature TL(n) is calculated based on the real-time detected indoor environment temperature Ta(n) and the indoor environment relative humidity RH(n); and the target dew point temperature TLs is calculated based on the set temperature Ts and the set humidity RHs.

8. The air conditioner according to claim 2, 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.

9. The air conditioner according to claim 2, characterized in that: The electric heating device is a PTC ceramic electric heating device.

10. An air conditioner, characterized in that: include: An indoor casing, on which an indoor air inlet and an indoor air outlet are provided; An indoor fan, disposed in the indoor casing; An indoor air guide plate, rotatably connected to the indoor casing to guide the air coming out of the indoor air outlet; 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 is used to detect the indoor environmental temperature and the indoor relative humidity. The indoor environment detection device is connected to the indoor casing and is located at the indoor air inlet; A controller, which is configured to: After receiving a dehumidification instruction, Obtain the current indoor environmental temperature Ta(n), the current indoor relative humidity RH(n), and the current outdoor environmental temperature Tout(n); Calculate the current dew point temperature TL(n) according to the current indoor environmental temperature Ta(n) and the current indoor relative humidity RH(n); Obtain the set temperature Ts and the set humidity RHs; Calculate the target dew point temperature TLs according to the set temperature Ts and the set humidity RHs; Calculate the set temperature difference E(n) and the dew point temperature difference Th(n). The set temperature difference E(n) is the difference between the current indoor environmental temperature Ta(n) and the set temperature Ts, and the dew point temperature difference Th(n) is the difference between the current dew point temperature TL(n) and the target dew point temperature TLs; When the set temperature difference E(n) ≤ the first preset set temperature difference E1, the dew point temperature difference Th(n) ≥ the first preset dew point temperature difference Th1, and the current outdoor temperature Tout(n) ≤ the first preset outdoor temperature Tout1 are simultaneously satisfied, the compressor starts, the compressor frequency is the initial frequency F(0), the indoor fan speed is the initial speed R(0), and the indoor air deflector rotates to the low circulation air volume position so that the air conditioner is in the low circulation air volume state; Initial speed R(0) = R L , where R dm <R L <R H , where R dm The minimum speed allowed for indoor fans, R L The indoor fan has a low speed, R H High speed of indoor fan; The initial frequency F(0) = F0, where Fmin < F0 < Fmax, Fmin is the minimum frequency of the compressor, and Fmax is the maximum frequency of the compressor.

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