air conditioner

Abstract

This invention proposes an air conditioner, comprising: a controller configured to: when the set temperature difference E(n) ≤ a first preset set temperature difference E1, the dew point temperature difference Th(n) ≥ a first preset dew point temperature difference Th1, and the current outdoor temperature Tout(n) ≤ a first preset outdoor temperature Tout1 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 guide plate rotates to a low circulation air volume position to put the air conditioner in a low circulation air volume state; the initial speed R(0) = R L When the air conditioner is in low cooling load or high latent load dehumidification mode, setting the indoor fan speed to a lower speed can reduce cooling capacity and increase dehumidification capacity. Setting the indoor air guide plate to rotate to a low circulating air volume position can reduce the circulating air volume, lower the evaporation temperature, improve the dehumidification effect, and prevent cold air from blowing onto the user.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to an air conditioner. Background Technology

[0002] During the humid season, plum rain season, or in coastal areas like Qingdao, room temperatures are comfortable, but relative humidity is high, sometimes approaching 100%. Users feel cold and damp, and items, especially textiles, become very so; walls may even seep water. In these conditions, the cooling load is low (cooling demand is very low, even 0W, and the need to lower the room temperature is minimal, or even unnecessary), while the humidity load is high (the room requires dehumidification, which is the user's primary concern). Split-type air conditioners consist of an indoor unit and an outdoor unit. The indoor unit includes an indoor heat exchanger, indoor fan, and indoor air guide plate, while the outdoor unit includes a compressor and an outdoor fan.

[0003] Conventional air conditioners lack a dehumidification valve (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, cooling, and dehumidification. The sensible heat and sensible cold cancel each other out, meaning the actual temperature doesn't decrease, but dehumidification occurs). Therefore, conventional air conditioners require cooling to dehumidify. However, if the room's cooling load is low, the room temperature is comfortable, and cooling is almost unnecessary. During dehumidification, the compressor will inevitably run at a low frequency. In this case, the evaporation temperature is higher than the dew point temperature, making dehumidification impossible. Alternatively, a lower temperature setting might allow the air conditioner to effectively dehumidify, but the room temperature will be low, making the room feel cold and uncomfortable for the user. For example, when the room temperature is low (e.g., 22°C) and the outdoor temperature is low (e.g., 23°C), to achieve dehumidification, the room temperature might be set to 21°C or lower. In this case, the room's cooling load is only tens of W, or even 0 W. Even if the compressor operates at a low frequency (e.g., 10Hz) and the indoor fan motor operates at a minimum reliable speed (e.g., 300rpm), the air conditioner's output capacity is over 500W, far exceeding the room's cooling load, yet the room temperature still drops significantly.

[0004] In the prior art, when the cooling load is low and the humidity load is high, and the room temperature is set appropriately, it is possible to achieve a certain degree of dehumidification by simply relying on the fan motor speed to reduce the evaporation temperature. However, under many operating conditions, this method has certain limitations. Reducing the evaporation temperature can easily trigger the freeze protection parameter protection and reduce the frequency (the freeze protection parameter does not change with the room temperature and is a set of fixed values), creating a contradictory situation of increasing and decreasing the frequency at the same time, which still cannot effectively dehumidify. Therefore, this application proposes an air conditioner. Summary of the Invention

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

[0006] Therefore, according to embodiments of this disclosure, an air conditioner is proposed, comprising:

[0007] The indoor unit casing has an indoor air inlet and an indoor air outlet.

[0008] An indoor fan is installed in the indoor unit casing;

[0009] An indoor air deflector is rotatably connected to the indoor unit casing to guide the airflow coming out of the indoor air outlet.

[0010] The outdoor unit casing has an outdoor air inlet.

[0011] The compressor is located inside the outdoor unit casing;

[0012] An outdoor ambient temperature detection device is used to detect the outdoor ambient temperature. The outdoor ambient temperature detection device is connected to the outdoor unit casing and is located at the outdoor air inlet.

[0013] An indoor environment detection device is used to detect indoor ambient temperature and indoor relative humidity. The indoor environment detection device is connected to the indoor unit casing and is located at the indoor air inlet.

[0014] The controller is configured to:

[0015] After receiving the dehumidification command

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

[0017] Calculate the current dew point temperature TL(n) based on the current indoor ambient temperature Ta(n) and the current indoor relative humidity RH(n);

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

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

[0020] 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.

[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 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 guide plate rotates to the low circulation air volume position so that the air conditioner is in a low circulation air volume state;

[0022] The initial rotational speed R(0) = RL, where Rdm < RL < RH, where 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 onto 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 continuously 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 start-up condition of the electric heating device, the electric heating device is started;

[0029] The initial start-up condition of the electric heating device is:

[0030] The continuously 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 continuously detected indoor ambient relative humidity RH(n) ≥ the set humidity RHs + the first preset humidity RH1;

[0031] Where the set temperature difference E(n) is the difference between the continuously detected indoor ambient temperature Ta(n) and the set temperature Ts.

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

[0033] According to an embodiment of the present disclosure, when the electric heating device is started, if 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, where the coefficient k ∈ (0. , 1.0). Setting the maximum rotational speed of the indoor fan to be restricted when the electric heating device is started can avoid generating a large whistling sound.

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

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

[0036] Calculate the current dew point temperature TL(n) based on the current indoor ambient temperature Ta(n) and the current indoor relative humidity RH(n);

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

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

[0039] When |TL(n)-TLs|≤1.0, the weight ratio i=0; when |TL(n)-TLs|>1.0, the weight ratio i=int(TL-TLs), where int is the floor function.

[0040] The indoor fan speed R(n) of this period is equal to 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) for this cycle is lower than the minimum allowable reliable operating speed Rdm of the indoor fan. If yes, the indoor fan speed R(n) for this cycle is equal to Rdm, and the indoor fan operates at the indoor fan speed for this cycle. If no, determine whether the electric heating device is operating.

[0042] When the electric heating device is not running, determine 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 is equal to 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, determine whether the indoor fan speed R(n) of this cycle is higher than k*RL, where the coefficient k∈(0.0, 1.0). If yes, the indoor fan speed R(n) of this cycle is k*RL 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.

[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 producing a loud whistling sound.

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

[0047] If Ta(n)-T 用 If 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 this disclosure, the controller includes an indoor controller and an outdoor controller, wherein the indoor controller is disposed inside the indoor unit housing; and the outdoor controller is disposed inside the outdoor unit housing.

[0051] The air conditioner also includes:

[0052] An indoor heat exchanger temperature detection device is installed 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 outdoor controller receives the indoor heat exchanger coil temperature Te_out = Te_in + T3, and the outdoor controller performs freeze protection on the indoor heat exchanger according to Te_out.

[0054] According to embodiments of this disclosure, the controller is configured to:

[0055] After the electric heating device has been turned on for at least the fourth preset time, the indoor ambient temperature Ta(n), indoor relative humidity RH(n), and outdoor ambient temperature Tout(n) are monitored in real time. When the electric heating device meets the shutdown conditions, the electric heating device is turned off. The shutdown conditions of the electric heating device are:

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

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

[0058] According to embodiments of this disclosure, the air conditioner further includes:

[0059] Electric heating indicator light or icon;

[0060] When dehumidifying, the electric heating device will not light up the indicator light or the icon on the screen after it is turned on, to avoid misunderstanding by the user.

[0061] According to embodiments of this disclosure, the electric heating device is a PTC ceramic electric heating device.

[0062] According to embodiments of this disclosure, an air conditioner is also provided, comprising:

[0063] The indoor unit casing has an indoor air inlet and an indoor air outlet.

[0064] An indoor fan is installed in the indoor unit casing;

[0065] An indoor air deflector is rotatably connected to the indoor unit casing to guide the airflow coming out of the indoor air outlet.

[0066] The outdoor unit casing has an outdoor air inlet.

[0067] The compressor is located inside the outdoor unit casing;

[0068] An outdoor ambient temperature detection device is used to detect the outdoor ambient temperature. The outdoor ambient temperature detection device is connected to the outdoor unit casing and is located at the outdoor air inlet.

[0069] An indoor environment detection device is used to detect indoor ambient temperature and indoor relative humidity. The indoor environment detection device is connected to the indoor unit casing and is located at the indoor air inlet.

[0070] The controller is configured to:

[0071] After receiving the dehumidification command

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

[0073] Calculate the current dew point temperature TL(n) based on the current indoor ambient temperature Ta(n) and the current indoor relative humidity RH(n);

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

[0075] Calculate the target dew point temperature TLs based on the set temperature Ts and 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 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.

[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 so that the air conditioner is in the low circulation air volume state.

[0078] The initial speed R(0) = RL, where Rdm < RL < RH. Here, Rdm is the reliable minimum allowable 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 flow chart of an air conditioner according to an embodiment of the present application;

[0083] Figure 3 is an initial startup flow chart of the electric heating device of an air conditioner according to an embodiment of the present application;

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

[0085] Figure 5 is a re-startup flow chart of the electric heating device of an air conditioner according to an embodiment of the present application;

[0086] Figure 6This is a flowchart illustrating the cycle of shutting down and restarting the electric heating device of an air conditioner according to an embodiment of this application;

[0087] Figure 7 This is another flowchart of an air conditioner according to an embodiment of this application;

[0088] Figure 8 This is another flowchart of an air conditioner according to an embodiment of this application;

[0089] Figure 9 This is another flowchart of an air conditioner according to an embodiment of this application;

[0090] Figure 10 This is another flowchart of an air conditioner according to an embodiment of this application;

[0091] Figure 11 This is a schematic diagram of the air conditioner air guide plate in a low circulating air volume position according to an embodiment of this application;

[0092] Figure 12 This is another cross-sectional view of an air conditioner according to an embodiment of this application;

[0093] Figure 13 This is a flowchart of determining Ts according to an embodiment of the present application for an air conditioner.

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

[0095] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0096] During the humid season, plum rain season, or in coastal areas like Qingdao, room temperatures are comfortable, but relative humidity is high, sometimes approaching 100%. Users feel cold and damp, and items, especially textiles, become very damp. Water may even seep from the walls. In these conditions, the cooling load in the room is low (the cooling load requirement is very low, even 0W, and the need to lower the room temperature is minimal, or even unnecessary), while the humidity load is high (the room requires dehumidification, which is the user's primary concern).

[0097] Conventional air conditioners lack a dehumidification valve (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, cooling, and dehumidification. The sensible heat and sensible cold cancel each other out, meaning the actual temperature doesn't decrease, but dehumidification occurs). Therefore, conventional air conditioners require cooling to dehumidify. However, if the room's cooling load is low, the room temperature is comfortable, and cooling is almost unnecessary. During dehumidification, the compressor will inevitably run at a low frequency. In this case, the evaporation temperature is higher than the dew point temperature, making dehumidification impossible. Alternatively, a lower temperature setting may allow the air conditioner to effectively dehumidify, but the room temperature will be low, making the room feel cold and uncomfortable for the user.

[0098] Therefore, this application proposes an air conditioner, as described below. Figures 1-13 Describe the air conditioner.

[0099] The air conditioner includes an indoor unit 100 and an outdoor unit, which are connected together.

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

[0101] refer to Figure 1 The indoor unit of the air conditioner includes an indoor unit casing 1, on which an indoor air inlet 11 and an indoor air outlet 12 are provided.

[0102] When the indoor unit of the air conditioner is wall-mounted, the height direction of the indoor unit casing is from the bottom end to the top end, the front and back directions are from the front to the back, and the length direction is from one end to the other. Among these three directions, any two are perpendicular.

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

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

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

[0106] The indoor unit of the air conditioner includes an indoor air duct 13, which is formed inside the indoor unit. The indoor air inlet is connected to the indoor air duct, and the indoor air outlet is connected to the indoor air duct.

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

[0108] The indoor heat exchanger is located inside the indoor unit casing and within the indoor air duct. The indoor heat exchanger is located at the indoor air inlet and inside 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 located inside the indoor unit casing and in the indoor air duct. The indoor fan is used to provide power for the air flow. 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 located on the side of the indoor fan closest to the indoor air inlet.

[0111] An outdoor unit of an air conditioner includes an outdoor unit casing, on which an outdoor air inlet and an outdoor air outlet are provided. An outdoor air duct is provided inside the outdoor unit casing, wherein the outdoor air inlet and the outdoor air outlet are connected to the outdoor air duct.

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

[0113] The outdoor heat exchanger is located inside the outdoor unit casing and in the outdoor air duct. The outdoor heat exchanger is located at the outdoor air inlet and inside 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 located inside the outdoor unit casing and in the outdoor air duct. The outdoor fan is used to provide power for the air flow. Driven by the outdoor fan, 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] Air conditioners also include a compressor and a throttling device. The compressor is located inside the outdoor unit casing. The compressor compresses the refrigerant gas in a low-temperature, low-pressure state and discharges the refrigerant gas in a high-temperature, high-pressure state. The throttling device can be an expansion valve. The expansion valve causes the high-temperature, high-pressure liquid refrigerant condensed in the condenser to expand into a low-pressure liquid refrigerant.

[0116] In both indoor and outdoor heat exchangers, 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 the cooling effect by using the latent heat of refrigerant evaporation to exchange heat with the material to be cooled.

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

[0118] The air conditioner also includes a four-way valve, which changes the direction of refrigerant flow to allow switching between cooling and heating cycles. The expansion valve can be an electronic expansion valve.

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

[0120] The indoor air guide plate is rotatably connected to the indoor unit casing.

[0121] In some embodiments of this 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 unit casing, and the outdoor ambient temperature detection device is located at the outdoor air inlet.

[0122] In this application, the outdoor ambient temperature detection device can obtain the outdoor ambient temperature, which makes it convenient for the air conditioner to perform some operations based on the outdoor ambient temperature. Furthermore, placing the outdoor ambient temperature detection device at the outdoor air inlet can improve the detection accuracy. When air enters through the outdoor air inlet, outdoor air will enter the outdoor unit casing through the outdoor air inlet, so the air in the outdoor environment will circulate, thus making the detected temperature more accurate.

[0123] The outdoor ambient temperature detection device can also be used as an indoor ambient temperature sensor.

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

[0125] In this application, an indoor environment detection device is installed to detect indoor ambient temperature and relative humidity in order to obtain relevant parameters. Furthermore, placing the indoor environment detection device at the indoor air inlet can improve detection accuracy. When indoor air enters the indoor unit casing through the indoor air inlet, it causes indoor circulation, which enables more accurate detection of indoor ambient temperature and relative humidity.

[0126] The indoor environment monitoring device can be an indoor temperature and humidity sensor. Alternatively, the indoor environment monitoring device can include independent indoor temperature and humidity sensors.

[0127] In some embodiments of this application, the air conditioner also includes a controller, specifically, the controller includes at least one of a central processing unit (CPU), a video processor, an audio processor, a graphics processing unit (GPU), a RAM (random access memory), a ROM (read-only memory), a first to an nth interface for input / output, a communication bus, etc.

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

[0129] The controller is connected to the drive motors of the indoor fan, outdoor fan, compressor, four-way valve, expansion valve, outdoor ambient temperature detection device, indoor ambient temperature detection device, and indoor air guide plate. The controller can receive the values ​​detected by the outdoor ambient temperature detection device and the indoor ambient temperature detection device, and control the working status of the indoor fan, outdoor fan, compressor, and indoor air guide plate according to its own set logic to ensure that the air conditioner works normally.

[0130] In some embodiments of this application, reference is made to Figure 2 The controller is configured as follows:

[0131] After receiving the dehumidification command

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

[0133] Calculate the current dew point temperature TL(n) based on the current indoor ambient temperature Ta(n) and the current indoor 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 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;

[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[[ID=3\7]] 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When the value is 0, there is no dehumidification capacity. For applications with low cooling load and high humidity load, the essence is to increase the latent heat ratio, i.e., Q. 潜 / Q 总 The higher the latent heat ratio, the smaller the temperature drop, but the greater the dehumidification capacity.

[0144] Dew point temperature is determined by both temperature and humidity. If the dew point temperature remains unchanged when moving from state point A to state point B, it indicates a constant humidity and changing temperature. If it decreases, it indicates dehumidification. For example, if the air moisture content at state point A is 20 g / kg, the air moisture content at state point B is 10 g / kg, the air density is 1.169 kg / m³, and the room air volume is 20 m³, then the actual dehumidification amount from state point A to state point B is (20 g / kg - 10 g / kg) * 1.169 kg / m³ * 20 m³ = 233.8 g.

[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 requirement.

[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 simultaneously satisfied, it indicates that the air conditioner has entered a low cooling load, high latent load dehumidification mode. Since the cooling load is very low or even 0W, the compressor needs to operate at the minimum frequency. A low compressor frequency results in a high evaporation temperature, thus no dehumidification capacity. Furthermore, because the latent load is high, the airflow speed caused by the indoor fan needs to be as low as possible, i.e., reducing the air conditioner's Q... 显 (Cooling capacity) output, which increases 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] Because the indoor fan operates at a low speed, the evaporation temperature is low for effective dehumidification, resulting in a lower outlet air temperature. On the other hand, while the desired indoor fan speed is below 300 rpm, the actual speed cannot be too low due to the minimum allowable reliable speed limit. For example, the minimum allowable reliable speed (Rdm) for a typical indoor fan is 400 rpm. At this speed, the airflow is still relatively high, the evaporation temperature is not low enough, and the increase in latent heat ratio is limited. Therefore, an indoor air guide vane is designed to rotate to a low-circulation airflow position to keep the air conditioner in a low-circulation airflow state. This reduces the circulating airflow, lowers the evaporation temperature, improves dehumidification, and prevents cold air from blowing directly onto the user. The optimal dehumidification effect is achieved when the indoor air guide vane is positioned at the lowest possible airflow angle, where the indoor unit's circulating airflow is minimized.

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

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

[0150] Upon receiving a dehumidification command, the system checks whether the indoor and outdoor fans have been running for more than a first preset time t1 within a certain period prior to the current time. If not, the compressor does not operate, and the indoor and outdoor fans are first controlled to rotate and run for the first preset time. Then, the current indoor ambient temperature Ta(n), the current indoor relative humidity RH(n), and the current outdoor ambient temperature Tout(n) are obtained. If yes, the current indoor ambient temperature Ta(n), the current indoor relative humidity RH(n), and the current outdoor ambient temperature Tout(n) are directly obtained. Setting the compressor to not operate and the indoor and outdoor fans to rotate can eliminate the influence of radiation and obtain the true indoor and outdoor ambient temperatures.

[0151] Before obtaining the current indoor ambient temperature Ta(n), current indoor relative humidity RH(n), and current outdoor ambient temperature Tout(n), the indoor and outdoor fans are turned on to eliminate the influence of radiation and allow air to circulate, so as to obtain the true indoor ambient temperature, indoor relative humidity, and outdoor ambient temperature.

[0152] Where 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 effect can be eliminated to avoid inaccurate indoor ambient temperature, indoor ambient humidity and outdoor ambient temperature.

[0153] The operating speeds of the indoor and outdoor fans can be determined based on the outdoor temperature and the set temperature difference. Specifically, a two-dimensional data table can be pre-set, in which the corresponding indoor and outdoor fan speeds are determined according to the outdoor temperature and the set temperature difference.

[0154] In some embodiments of this application, under normal circumstances, when E(n) < 0℃, that is, when the user-set temperature is higher than the actual room temperature, the compressor will not start; when E(n) > 0℃, the air conditioner will turn on the dehumidification mode, and the compressor will definitely start.

[0155] The air conditioner also includes a remote control for the indoor unit, where the humidity setting (RHs) can be set using the remote control.

[0156] The set temperature Ts is the temperature set for dehumidification, and the set temperature Ts is based on the user-set temperature T. 用 The temperature T is determined by s, which is the user-set temperature. 用 s can be set using a remote control.

[0157] refer to Figure 13 The specific method for determining the set temperature Ts is as follows:

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

[0159] If Ta(n)-T 用 If s≤0℃, 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 a remote control.

[0161] Under normal circumstances, when E(n) < 0℃, that is, when the user sets the temperature 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 compressor will definitely start when the air conditioner turns on the dehumidification mode. Therefore, this method of determining the set temperature Ts ensures that the set temperature difference E(n) (E(n) = Ta(n) - Ts) > 0, thus ensuring that the compressor can start normally.

[0162] T1 is generally taken as any value between 0.1℃ and 5℃, where T1 can be 1.5℃, so that the temperature is neither too high nor too low, avoiding the compressor dehumidification operation time being too short and the dehumidification effect being poor if the T1 temperature is too low.

[0163] In some embodiments of this application, reference is made to Figure 3 The air conditioner also includes an electric heating device 31, which is located inside the indoor unit casing and between the indoor heat exchanger and the indoor fan.

[0164] The electric heating device is connected to the controller, which can control the working state of the electric heating device according to its own set logic so that the air conditioner can work normally.

[0165] The controller is configured as follows:

[0166] Upon receiving a dehumidification command, the system monitors the outdoor ambient temperature Ta(n), indoor relative humidity RH(n), and outdoor ambient temperature Tout(n) in real time. When the electric heating device meets the initial start-up conditions, the electric heating device is turned on.

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

[0168] When the real-time detected outdoor ambient temperature Tout(n) ≤ the second preset outdoor temperature Tout2, or when 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;

[0169] Here, 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℃-25℃. The second preset temperature difference E2 can be 0.5℃. The first preset humidity RH1 is 10%.

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

[0172] The fourth preset time is 5 minutes.

[0173] An electric heating device is installed. When the electric heating device is turned on, it can counteract the sensible cooling, so that the room temperature does not drop or drops slightly.

[0174] The controller is configured such that when the electric heating device is turned on, and the maximum speed of the indoor fan is greater than k*RL, the speed of the indoor fan is set to k*RL, where the coefficient k∈(0.0, 1.0). Limiting the maximum speed of the indoor fan when the electric heating device is turned on helps prevent excessive whistling noise.

[0175] In some embodiments of this application, reference is made to Figure 4 The controller is configured to:

[0176] After the electric heating device has been turned on for at least the fourth preset time, the indoor ambient temperature Ta(n), indoor relative humidity RH(n), and outdoor ambient temperature Tout(n) are monitored in real time. When the electric heating device meets the shutdown conditions, the electric heating device is turned off. The shutdown conditions of the electric heating device are:

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

[0178] Specifically, the current dew point temperature TL(n) is calculated based on the real-time detected indoor ambient temperature Ta(n) and indoor ambient 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 can be 30 minutes.

[0180] In some embodiments of this application, reference is made to Figure 5 The controller is configured to:

[0181] After the electric heating device is turned off, the indoor ambient temperature Ta(n), indoor relative humidity RH(n), and outdoor ambient temperature Tout(n) are monitored in real time. When the electric heating device meets the conditions for restarting, the electric heating device is turned on.

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

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

[0184] Specifically, the current dew point temperature TL(n) is calculated based on the real-time detected indoor ambient temperature Ta(n) and indoor ambient 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 can be 1℃. The fifth preset time t5 can be 2min.

[0186] After the electric heating device is turned on again, the electric heating device will be on for at least the fourth preset time.

[0187] refer to Figure 6 After the electric heating device has been turned on for at least four preset times, it enters a cycle of determining whether to turn off, whether to turn on again, and whether to turn off again. This enables the electric heating device to operate intermittently and suppresses the power consumption of the electric heating device.

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

[0189] When the heating device is turned on, the electric heating indicator light or the icon on the screen will light up. However, in dehumidification mode, to avoid user misunderstanding, the electric heating indicator light or the icon on the screen will not light up when the electric heating device is turned on.

[0190] In some embodiments of this application, the controller includes an indoor controller and an outdoor controller, wherein the indoor controller is disposed inside the indoor unit housing; and the outdoor controller is disposed inside the outdoor unit housing.

[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 located on the indoor heat exchanger.

[0192] Because the electric heating device is turned on, the cooling load is increased, the compressor frequency rises, and the evaporation temperature is lowered to achieve a large dehumidification capacity. The evaporation temperature may be lowered to the point of triggering the freeze 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 and add the third preset temperature T3 to it and send it to the outdoor controller. The outdoor controller receives the indoor heat exchanger coil temperature Te_out = Te_in + T3. The outdoor controller performs freeze protection on the indoor heat exchanger according to Te_out to avoid or reduce the triggering of freeze protection, so as to ensure that the indoor heat exchanger does not frost or ice up and can effectively dehumidify.

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

[0194] T3 < Te0 (Te0 is the freeze protection frequency reduction temperature) - T4 (T4 is the critical temperature for frost and ice formation, generally taken as 1-2℃). If Te0 = 6℃ and 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℃ and 5℃.

[0195] In some embodiments of this application, reference is made to Figure 7 The controller is configured as follows:

[0196] After the compressor runs at its initial frequency for a second preset time t2, the compressor frequency is periodically determined.

[0197] Within each compressor frequency cycle, the compressor frequency F(n) of the current cycle is equal to the previous compressor frequency F(n-1) plus the change in compressor frequency dF of the current cycle.

[0198] Once the compressor frequency for this cycle is determined, the compressor operates at the compressor frequency for this cycle.

[0199] The compressor frequency change dF during this cycle can be a fixed value.

[0200] The period for determining the compressor frequency is the seventh preset time t7. The seventh preset time t7 can be 5 minutes. The second preset time t2 can be 10 minutes.

[0201] The compressor frequency change dF during this period can be positive, negative, or 0. Fmin≤F(n)≤Fmax, where Fmin is the minimum compressor frequency and Fmax is the maximum compressor frequency.

[0202] Alternatively, the compressor frequency change dF in this cycle is determined based on the set temperature difference E(n) and the set temperature difference change rate ΔE in this cycle;

[0203] In this cycle, the set temperature difference E(n) is the difference between the current indoor ambient temperature Ta(n) and the set temperature Ts;

[0204] The set temperature difference change rate ΔE(n) for this period = the previous set temperature difference E(n-1) - the set temperature difference for this period E(n);

[0205] Specifically, based on the set temperature difference E(n) and the set temperature difference change rate ΔE for this cycle, the compressor frequency change dF for this cycle is searched in the preset data table (Table 1). If the set temperature difference E(n) and the set temperature difference change rate ΔE for this cycle exist in the table, the compressor frequency change dF corresponding to both is determined. If neither the set temperature difference E(n) nor the set temperature difference change rate ΔE for this cycle exists in the preset data table, the closest data is found, and then the compressor frequency change dF corresponding to both is determined.

[0206] Table 1

[0207]

[0208]

[0209] Among them, the values ​​of a1, a2, a3, a4, and a5 decrease sequentially. The values ​​of a6, a7, a8, and a9 also decrease sequentially.

[0210] In some embodiments of this application, see reference Figures 8-10 After the compressor runs at the initial frequency for a second preset time t2, the rotational speed of the indoor fan is periodically determined according to the weight ratio.

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

[0212] Calculate the current dew point temperature TL(n) based on the current indoor ambient temperature Ta(n) and the current indoor relative humidity RH(n);

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

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

[0215] When |TL(n)-TLs|≤1.0, the weight ratio i=0; when |TL(n)-TLs|>1.0, the weight ratio i=int(TL-TLs), where int is the floor function (i is an integer, i 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 intake 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 capacity during heating operation is insufficient, the electric heating device is used to supplement the heating capacity. During 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 Figures 11-12During the oscillation of the indoor air guide plate, the minimum rotation angle of the indoor air guide plate is A, and the maximum rotation angle of the indoor air guide plate is B, where B>A>0°. When the indoor air guide plate is in the low circulating air volume position, the rotation angle of the indoor air guide plate is C, where A+α≥C≥A or B≥C≥B-α, where α can be 10°.

[0225] The indoor air guide plate includes a horizontal air guide plate and a vertical air guide plate. The horizontal air guide plate swings up and down, while the vertical air guide plate swings to both sides of the indoor unit of the air conditioner.

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

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

[0228] When the indoor unit of the air conditioner is a wall-mounted unit, the vertical air guide plate is located inside the horizontal air guide plate. When the vertical air guide plate swings to its 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 vertical air guide plate is used to close the indoor air outlet, and the horizontal air guide plate is located inside the vertical air guide plate.

[0230] In some embodiments of this application, the electric heating device is a PTC ceramic electric heating device, where PTC ceramic is a "positive temperature coefficient ceramic".

[0231] When the PTC ceramic electric heating device is working, its resistance is very small at room temperature, but it will suddenly increase by thousands to millions of times as the temperature rises to a certain specific temperature (transition temperature), and return to its original state when the temperature drops.

[0232] PTC is an abbreviation for positive temperature coefficient ceramic. PTC ceramics are a type of electronic ceramic. They are made by sintering high-purity barium titanate with oxides of niobium, bismuth, antimony, lead, manganese, silicon, etc., at 1300℃ to 1350℃. The properties of PTC ceramics vary with room temperature resistivity, temperature transition, temperature coefficient of resistance, and maximum resistivity.

[0233] During dehumidification, the electric heating device needs to operate intermittently, and the surrounding air is cold. The heat output of the electric heating device is automatically adjusted when it is working, and the surface temperature is constant. There is no safety risk when condensation forms on the device when it stops. Therefore, the electric heating device is of the PTC type.

[0234] In some embodiments of this 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℃.

[0237] The first preset temperature difference E1 = 3℃, and the second preset temperature difference E2 = 0.5℃.

[0238] The first preset dew point temperature difference Th1 = 10℃, and the second preset dew point temperature difference Th2 = 1℃.

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

[0240] The first preset outdoor temperature Tout1 = 30℃, and the second preset outdoor temperature Tout2 = 24℃.

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

[0242] T3=3℃, RH1=10%, Te0=6℃.

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

[0244] Example 1:

[0245] Received dehumidification signal

[0246] T 用 With s = 25℃ and RHs = 55%, the indoor and outdoor motors rotate. The indoor and outdoor motors are controlled to run for t1 = 30 seconds first.

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

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

[0249] The calculated TL(0) = 24.3℃ and TLs = 15.2℃.

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

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

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

[0253] With Ta(n) = 26℃ and RH(n) = 78%, TL = 21.7℃ was calculated, at which point 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] With Ta(n+1) = 25.5℃ and RH(n+1) = 71%, TL is calculated to be 19.7℃, at which point 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 forcibly turned on, the electric heating screen icon is not lit, at this time R(2)=600rpm>k*RL=0.8*700rpm=560rpm, that is, the forced R(2)=560rpm.

[0259] New testing cycle,

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

[0261] Example 2:

[0262] Received 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 outlet is least likely. 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 freezing frequency reduction protection is not triggered. Detect that at this time F(n) = 25 Hz, 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℃ < Th2 = 1℃, 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℃, RH(n + 1) = 72%. Calculate TL = 16.1℃.

[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℃ < 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 to the present invention.

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

[0282] [[ID=2X]]In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "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 it may be the internal connection of two components. 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 description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioner, characterized in that, include: The indoor unit casing has an indoor air inlet and an indoor air outlet. An indoor fan is installed in the indoor unit casing; An indoor heat exchanger is disposed inside the indoor unit housing and located on the side of the indoor fan closer to the indoor air inlet; An electric heating device is installed inside the indoor unit housing and located between the indoor heat exchanger and the indoor fan; the electric heating device is turned on when the initial start-up conditions of the electric heating device are met. An indoor air deflector is rotatably connected to the indoor unit casing to guide the airflow coming out of the indoor air outlet. The outdoor unit casing has an outdoor air inlet. The compressor is located inside the outdoor unit casing; after the compressor runs at an initial frequency for a second preset time, the rotational speed of the indoor fan is periodically determined according to a weighted ratio. An outdoor ambient temperature detection device is used to detect the outdoor ambient temperature. The outdoor ambient temperature detection device is connected to the outdoor unit casing and is located at the outdoor air inlet. An indoor environment detection device is used to detect indoor ambient temperature and indoor relative humidity. The indoor environment detection device is connected to the indoor unit casing and is located at the indoor air inlet. The controller is configured to: After receiving the dehumidification command Within each indoor fan speed determination cycle, the current indoor ambient temperature Ta(n), the current indoor relative humidity RH(n), and the current outdoor ambient temperature Tout(n) are acquired in real time; where, the indoor fan speed R(n) of this cycle = the previous fan speed R(n-1) - i*R, and R is the first preset speed; Calculate the current dew point temperature TL(n) based on the current indoor ambient temperature Ta(n) and the current indoor relative humidity RH(n); Obtain the set temperature Ts and set humidity RHs; The target dew point temperature TLs is calculated based on the set temperature Ts and the set humidity RHs; where, 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 the floor function; 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. 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 guide plate rotates to the low circulation air volume position so that the air conditioner is in a low circulation air volume state; Initial rotational speed R(0) = R L , where R dm <R L < R H , where R dm For the indoor fan, the minimum permissible speed is R. L For low-speed indoor fans, R H Indoor fan at high speed; The initial start-up conditions for the electric heating device are: When the real-time detected outdoor ambient temperature Tout(n) is less than or equal to the second preset outdoor temperature Tout2, or when the set temperature difference E(n) is less than or equal to the second preset set temperature difference E2 and the real-time detected indoor ambient relative humidity RH(n) is greater than or equal to the set humidity RHs + the first preset humidity RH1; where the set temperature difference E(n) is the difference between the real-time detected indoor ambient temperature Ta(n) and the set temperature Ts.

2. The air conditioner according to claim 1, characterized in that, When the electric heating device is turned on, the maximum speed of the indoor fan is greater than k*R. L At that time, the indoor fan speed is k*R L， The coefficient k∈(0.0, 1.0).

3. The air conditioner according to claim 2, characterized in that, 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 this is the case, the indoor fan speed R(n) = R in this cycle. dm The indoor fan operates at the current cycle's indoor fan speed. If this is not the case, determine whether the electric heating device is operating. When the electric heating device is not running, determine whether the indoor fan speed R(n) for this cycle is higher than the indoor fan high speed R. H When this is the case, the indoor fan speed R(n) = R in this cycle. H If the indoor fan operates at the indoor fan speed of the current cycle, then if the indoor fan is not operating at the indoor fan speed of the current cycle; When the electric heating device is running, determine whether the indoor fan speed R(n) for this cycle is higher than k*R. L The coefficient k∈(0.0, 1.0), when it is true, the indoor fan speed R(n) in this cycle is = k*R L If the indoor fan operates at the indoor fan speed of the current cycle, then if the indoor fan is not operating at the indoor fan speed of the current cycle; Among them, R dm <R L < R H .

4. The air conditioner according to claim 1, characterized in that, The method for determining the set temperature Ts is 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.

5. The air conditioner according to claim 1, characterized in that, The controller includes an indoor controller and an outdoor controller, with the indoor controller located inside the indoor unit housing; The outdoor controller is located inside the outdoor unit housing; The air conditioner also includes: An indoor heat exchanger temperature detection device is installed 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 and add the third preset temperature T3 to it and send it to the outdoor controller. The outdoor controller receives the indoor heat exchanger coil temperature Te_out = Te_in + T3, and the outdoor controller performs freeze protection on the indoor heat exchanger according to Te_out.

6. The air conditioner according to claim 1, characterized in that, The controller is configured to: After the electric heating device has been turned on for at least the fourth preset time, the indoor ambient temperature Ta(n), indoor relative humidity RH(n), and outdoor ambient temperature Tout(n) are monitored in real time. When the electric heating device meets the shutdown conditions, the electric heating device is turned off. The shutdown conditions of the electric heating device are: Dew point temperature TL(n) - target dew point temperature TLs ≤ second preset dew point temperature difference Th2 or electric heating device continuous on time ≥ sixth preset time t6 Specifically, the current dew point temperature TL(n) is calculated based on the real-time detected indoor ambient temperature Ta(n) and indoor ambient relative humidity RH(n); the target dew point temperature TLs is calculated based on the set temperature Ts and set humidity RHs.

7. The air conditioner according to claim 1, characterized in that, The air conditioner also includes: Electric heating indicator light or icon; When dehumidifying, the electric heating device is turned on, and the electric heating indicator light or the icon on the screen does not light up.

8. The air conditioner according to claim 1, characterized in that, The electric heating device is a PTC ceramic electric heating device.

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