WO2021088644A1

WO2021088644A1 - Control method for preventing cold air during heating startup of air conditioner

Info

Publication number: WO2021088644A1
Application number: PCT/CN2020/122520
Authority: WO
Inventors: 刘卫兵; 郝本华; 樊明敬; 刘庆赟; 徐中华; 孙婷
Original assignee: 青岛海尔空调器有限总公司; 海尔智家股份有限公司
Priority date: 2019-11-04
Filing date: 2020-10-21
Publication date: 2021-05-14
Also published as: CN110986328A

Abstract

A control method for preventing cold air during heating startup of an air conditioner. The control method comprises: when an indoor unit of the air conditioner receives a heating signal, measuring a coil pipe temperature Tp of the indoor unit; and on the basis of the coil pipe temperature Tp, controlling an air supply angle of an air outlet of the indoor unit, and controlling a compressor of the air conditioner and a fan of the indoor unit to operate in a corresponding startup cold-air-prevention mode and/or a heating operation mode. The air supply angle of the air outlet, the operation mode of the compressor and the operation mode of the fan are respectively controlled according to the coil pipe temperature Tp of the indoor unit, such that a phenomenon of cold air being generated when the air conditioner is started for heating is avoided or weakened by means of preheating a coil pipe and air duct group of the indoor unit in advance.

Description

Control method for preventing cold wind when air conditioner heating is turned on

Technical field

The present invention relates to a method for controlling an air conditioning system, in particular to a control method for preventing cold wind when the air conditioner is heated and turned on.

Background technique

Air conditioners, including split air conditioners, integrated air conditioners, or VRF (Variable Refrigerant Volume) and other air conditioning systems, generally include a compressor for compressing refrigerant, an expansion device for expanding and decompressing the refrigerant, and an outdoor heat exchanger (usually " "Coil" form) and indoor heat exchanger (generally "coil" form), the outdoor coil is used to exchange heat with outdoor air, while the indoor coil is used to exchange heat with indoor air to reduce or increase the indoor air temperature. In split air conditioning or VRF air conditioning systems, indoor coils are usually placed in independent indoor unit units, such as wall-mounted indoor units, floor-standing cabinets, or embedded indoor units. Many current air conditioners are configured to provide cooling, heating, or a mixture of the two functions. In the cooling mode, the indoor coil acts as an evaporator, and the refrigerant circulating in the air conditioner evaporates in the evaporator to absorb heat from the indoor air, so that the indoor air is lowered in temperature (ie, cooling). In the heating mode, the indoor coil acts as a condenser. The refrigerant in the indoor coil is condensed into liquid by releasing heat to the indoor air. At the same time, the indoor air is also heated to a higher temperature (ie heating ). In areas with low temperature seasons, in addition to cooling functions, air conditioners usually also have heating functions. When the outdoor environment temperature drops below a certain temperature, the user will select the air conditioner to operate in heating mode to increase the indoor temperature, thereby improving the indoor human body comfort.

However, when the outdoor environment temperature is relatively low, the temperature of the indoor coil will be relatively low before the air conditioner is turned on. For example, in the winter when the air conditioner is powered on, it is in a low temperature environment for a long time, and due to the slight heat exchange of the refrigerant in the indoor heat exchanger (coil), the heat exchanger is in a low temperature state, and the air conditioner will be turned on. As a result, when the air conditioner is just turned on, cold air blows out from the air outlet. Within a minute or two after the air conditioner is turned on, many users will subconsciously experience the air outlet temperature of the air conditioner. This cold wind will affect the user experience of the air conditioner. In the effect. In order to avoid the phenomenon of cold wind blowing when the air conditioner is turned on during heating, the prior art has developed some "anti-cold wind" methods, and the function of "preventing cold wind when heating is turned on" is added to the control system of the air conditioner. For example, the Chinese invention patent application CN110332664A discloses a method for controlling an air conditioner. In this control method, during the heating and anti-cold wind phase, the indoor fan is controlled to temporarily not start, and when one of the following two conditions is met, the fan is controlled to start running at a low speed until the evaporator coil temperature meets the set temperature : (1) Real-time detection of the evaporator coil temperature TE, when TE is greater than or equal to the first set temperature TE1 of the evaporator coil; (2) The thermal operation time of the air conditioner's compression mechanism is greater than or equal to the preset operating time of the compressor. According to the temperature of the evaporator coil or the thermal operating time of the compression mechanism, the method controls the fan to not start, then run at a low speed, and then enter the normal speed operation to prevent cold air from blowing out of the evaporator coil. This control method only considers controlling the fan to prevent cold air from being generated when the air conditioner is turned on while ignoring other possible factors that affect the appearance of cold air. Therefore, this method cannot more accurately prevent the appearance of cold air when the air conditioner is turned on.

Correspondingly, a new technical solution is needed in this field to solve the above-mentioned problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, to solve the technical problem of more accurately preventing the generation of cold air when the air conditioner is turned on, the present invention provides a control method for preventing cold air when the air conditioner is turned on. Including: when the indoor unit of the air conditioner receives a heating signal, detecting the coil temperature Tp of the indoor unit; based on the coil temperature Tp, controlling the air supply angle of the air outlet of the indoor unit and controlling all The compressor of the air conditioner and the fan of the indoor unit operate in a corresponding start-up anti-cold wind mode and/or heating operation mode.

In the above-mentioned preferred technical solution for the control method for preventing cold wind when the air conditioner is turned on, when the coil temperature Tp<23°C: the air outlet first enters the minimum air supply angle and continues for the first predetermined period of time Then enter the user-set angle; the compressor starts to run in the heating operation mode of the compressor after a delay of a second predetermined period of time after the indoor unit receives the heating signal; and the fan enters In the cold wind prevention mode when the fan is turned on, the first predetermined time period is longer than the second predetermined time period.

In the above-mentioned preferred technical solution for the control method for preventing cold wind when the air conditioner is turned on, when the coil temperature Tp<23°C, the cold wind prevention mode of the fan when the fan is turned on includes: the fan is in the indoor unit After receiving the heating signal, it is turned off for the first third predetermined period of time, and then the fan starts to run at the first predetermined speed during the second said third predetermined period of time. Operating at a second predetermined speed during the third predetermined time period, and entering the heating operation mode of the fan after the third predetermined time period to operate at a third predetermined speed, wherein the third The predetermined speed is greater than the second predetermined speed, and the second predetermined speed is greater than the first predetermined speed; and wherein the third predetermined period of time is shorter than the first predetermined period of time and longer than the second predetermined period of time. Scheduled time period.

In the above-mentioned preferred technical solution for the control method for preventing cold wind when the air conditioner heating is turned on, when the coil temperature Tp<23°C, the operation of the compressor in the heating operation mode of the compressor includes: The compressor operates at a first predetermined frequency.

In the above-mentioned preferred technical solution for the control method for preventing cold wind when the air conditioner is turned on, when 23°C ≤ the coil temperature Tp ≤ 40°C: the air outlet enters the angle set by the user; the compressor is at After receiving the heating signal, the indoor unit is delayed for a second predetermined period of time and then starts to enter the cold wind prevention mode when the compressor is turned on; and the fan enters the cold wind prevention mode when the fan is turned on.

In the above-mentioned preferred technical solution for the control method for preventing cold wind when the air conditioner is turned on, the cold wind prevention mode of the compressor includes: the compressor first runs at a second predetermined frequency for a third predetermined period of time, and then enters The heating operation mode of the compressor operates at a first predetermined frequency, wherein the first predetermined frequency is greater than the second predetermined frequency, and wherein the third predetermined period of time is greater than the second predetermined period of time .

In the above-mentioned preferred technical solution for the control method for preventing cold wind when the air conditioner is turned on, the cold wind prevention mode of the fan includes: when 23°C ≤ the coil temperature Tp<30°C, the fan is in place The indoor unit is turned off for the first and third predetermined time period after receiving the heating signal, and then the fan runs at the first predetermined speed for the second and third predetermined time period, and at After the second said third predetermined period of time, it enters the heating operation mode of the fan and runs at a third predetermined speed, wherein the third predetermined speed is greater than the first predetermined speed.

In the above-mentioned preferred technical solution for the control method for preventing cold wind when the air conditioner is turned on, the cold wind prevention mode of the fan includes: when 30°C ≤ the coil temperature Tp ≤ 40°C, the fan is in place The indoor unit operates at a first predetermined speed during the first third predetermined time period after receiving the heating signal, and then the fan operates at a second predetermined speed during the second, third predetermined time period , And enter the heating operation mode of the fan to run at a third predetermined speed after the second said third predetermined period of time, wherein the third predetermined speed is greater than the second predetermined speed, and the first The second predetermined speed is greater than the first predetermined speed.

In the above-mentioned preferred technical solution for the control method for preventing cold wind when the air conditioner is turned on, when the coil temperature Tp>40°C: the air outlet enters a user-set angle; the fan is in the indoor unit After receiving the heating signal, it starts to run in the heating operation mode of the fan after a delay of a second predetermined period of time after receiving the heating signal; and the compressor delays a fourth predetermined period after the indoor unit receives the heating signal After a period of time, start to run in the heating operation mode of the compressor, wherein the fourth predetermined period of time is longer than the second predetermined period of time.

In the above-mentioned preferred technical solution for the control method for preventing cold wind when the air conditioner is heated and turned on, the air outlet includes horizontal louvers and vertical louvers that can adjust the air supply angle.

Those skilled in the art can understand that, in the technical solution of the present invention, the control method for preventing cold wind when the air conditioner is turned on detects the coil temperature Tp of the indoor unit of the air conditioner in real time, and based on the coil temperature Tp, The air supply angle of the air outlet of the indoor unit is controlled, and the compressor of the air conditioner and the fan of the indoor unit are controlled to operate in a corresponding start-up anti-cold wind mode and/or heating operation mode. In this method, the three factors that affect the generation of cold air, namely the air outlet angle of the indoor unit, the fan and the compressor, are considered, and the air outlet angle and air outlet angle are respectively controlled according to the coil temperature Tp of the indoor unit. The operation mode of the compressor and the operation mode of the fan are used to preheat the coils and ducts of the indoor unit in advance to avoid or weaken the phenomenon of cold air when the air conditioner is turned on, thereby improving the user experience of the air conditioner.

Preferably, when the coil temperature Tp<23°C, the air outlet angle of the air outlet is configured to be at the minimum angle and lasts for the first predetermined period of time, and the compressor delays for the second predetermined period of time after the indoor unit receives the heating signal The start-up runs in the heating operation mode of the compressor, and the fan directly enters the start-up anti-cold wind mode of the fan, wherein the first predetermined time period is longer than the second predetermined time period. In the case that the coil temperature Tp is very low, through this control method, the coil and the air duct group of the indoor unit can be quickly preheated (because the compressor runs in the normal heating mode), and the operation of the fan is controlled at the same time And keep the air supply angle of the air outlet at the minimum angle until the compressor runs for a period of time to avoid cold air blowing out when the compressor is just turned on.

Preferably, when 23°C ≤ coil temperature Tp ≤ 40°C, the air outlet angle of the air outlet can enter the user-set angle according to user requirements; the compressor delays the second predetermined time after the indoor unit receives the heating signal After the start of the compressor, it starts to enter the anti-cold wind mode of the compressor, and then runs at a lower frequency, and then runs at a higher frequency; the fan enters the anti-cold wind mode of the fan when it starts, and based on the specific temperature range of Tp, it is first kept off or at a lower temperature. Speed running. The coil temperature is greater than or equal to 23°C and less than or equal to 40°C, which is not too low or too high. Therefore, when the fan is not started or is running at low speed, the compressor will run at a lower frequency first, which can prevent the indoor unit from malfunctioning. The coil temperature is too high and triggers the hot start protection program of the air conditioner.

Preferably, when the coil temperature Tp>40°C, the air outlet enters the angle set by the user; the fan starts to run in the heating operation mode of the fan after a second predetermined period of time after the indoor unit receives the heating signal; After receiving the heating signal, the indoor unit starts up in the heating operation mode of the compressor after being delayed for a fourth predetermined period of time, and the fourth predetermined period of time is longer than the second predetermined period of time. When the coil temperature Tp>40℃, cold air is unlikely to occur. Therefore, both the fan and the compressor can operate in the normal heating mode, and the fan starts before the compressor to prevent the overheating protection program from being triggered.

Description of the drawings

The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

Fig. 1 is a schematic diagram of an example of an indoor unit of an air conditioner;

Fig. 2 is a schematic diagram of the air outlet assembly of the indoor unit shown in Fig. 1;

FIG. 3 is a flowchart of an embodiment of the control method for preventing cold wind when the air conditioner is heated and turned on according to the present invention;

4 is a flow chart of the first embodiment of the control method for preventing cold wind when the air conditioner is heated and turned on according to the present invention;

Fig. 5 is a flowchart of a second embodiment of a control method for preventing cold wind when the air conditioner is turned on and heating according to the present invention;

Fig. 6 is a flowchart of the third embodiment of the control method for preventing cold wind when the air conditioner is turned on and heating according to the present invention.

List of reference signs:

1. Floor-standing cabinet; 11. Air outlet louver; 111, horizontal louver; 112, horizontal louver connecting rod; 113, vertical louver; 12, air outlet frame assembly; 13, air duct skeleton; 131, panel card slot; 14 , Fan; 15, motor; 16, air duct group.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

In order to solve the technical problem that the existing control method for preventing cold wind from heating and turning on of the air conditioner is not accurate enough, the present invention provides a control method for preventing cold wind when the heating of the air conditioner is turned on. The control method includes: step S1, when the indoor unit of the air conditioner is closed When the heating signal is reached, detect the coil temperature Tp of the indoor unit; step S2, based on the coil temperature Tp, control the air supply angle of the air outlet of the indoor unit and control the compressor of the air conditioner and the fan of the indoor unit to prevent the corresponding start-up Operation in cold air mode and/or heating operation mode. The control method can control the temperature of the air outlet at the moment when the air conditioner is turned on to avoid cold air, thus improving the experience effect of the air conditioner.

Fig. 1 is a schematic diagram of an example of an indoor unit of an air conditioner, and Fig. 2 is a schematic diagram of an air outlet assembly of the indoor unit shown in Fig. 1. As shown in Figure 1, the indoor unit is a floor-standing cabinet 1. The floor-standing cabinet 1 has an air outlet assembly 12. As shown in FIG. 2, the air outlet assembly 12 includes air outlet louvers 11 for guiding the wind from the indoor unit 1. The air outlet louver 11 includes a horizontal louver 111 and a vertical louver 113 movably connected to the horizontal louver 111, wherein the horizontal louver 111 is connected together by a louver connecting rod 112. The horizontal louver 111 can swing in the up and down direction, and the vertical louver 113 can swing in the left and right direction, and together they are used to adjust the blowing direction and/or air volume of the air outlet. The air outlet assembly 12 also includes an air duct framework 13 in which is formed an air duct group 16 that allows air to enter the indoor unit and the coils (not shown in the figure) of the indoor unit for heat exchange. A plurality of panel clamping slots 131 are also formed on the air duct frame 13, and these panel clamping slots 131 are used to detachably fix the panel of the indoor unit (not shown in the figure). Inside the floor-standing cabinet 1, a fan 14 and a motor 15 for driving the fan to rotate are also included. When the fan 14 is working, the indoor air will be sucked into the indoor unit from the air duct group 16 and exchange heat with the coil of the indoor unit (not shown in the figure), and then be blown in through the air outlet louvers 11 indoor.

The following describes the control method of the present invention for preventing cold wind when the air conditioner heating is turned on based on the above-mentioned floor-standing cabinet 1. It should be pointed out that the control method of the present invention can be used to control any suitable form of indoor unit.

Fig. 3 is a flowchart of an embodiment of a control method for preventing cold wind when the air conditioner is turned on for heating according to the present invention. As shown in FIG. 3, when the floor-standing cabinet 1 receives a heating signal, the control system of the air conditioner first detects the coil temperature Tp of the floor-standing cabinet 1 (step S1). According to the coil temperature Tp, the control system of the air conditioner controls the air supply angle of the air outlet louvers 11, and according to the coil temperature Tp, controls the compressor of the air conditioner and the fan of the indoor unit to operate in the corresponding anti-cold wind mode and/or The heating operation mode is operated (step S2).

Fig. 4 is a flow chart of the first embodiment of the control method for preventing cold wind when the air conditioner is heated and turned on according to the present invention. As shown in FIG. 4, when the floor-standing cabinet 1 receives a heating signal, the control method executes step S1 to detect the coil temperature Tp of the floor-standing cabinet 1.

When the coil temperature Tp<23°C, the guide plate (not shown in the figure) covering the air outlet is slid away, and the air outlet louvers 11 are placed at the minimum air supply angle and continue for the first predetermined time period. After a predetermined period of time, the automatic adjustment is performed to enter the user-set angle (step S3). In one or more embodiments, the first predetermined period of time may be 1 minute (min). Alternatively, in other embodiments, the first predetermined time period may also be a time period longer or shorter than 1 minute.

When the coil temperature Tp<23°C, the compressor starts to run in the heating operation mode of the compressor after a second predetermined period of time after the floor-standing cabinet 1 receives the heating signal (step S4). The second predetermined time period is shorter than the first predetermined time period. In one or more embodiments, the second predetermined period of time may be 1 second (s). In an alternative embodiment, the second predetermined time period may be longer than 1 second or shorter than 1 second. The heating operation mode of the compressor means that the compressor operates in a normal heating mode at a first predetermined frequency. In one or more implementations, the first predetermined frequency may be 78 Hz. In other embodiments, the first predetermined frequency may also be another frequency value that meets the air conditioning load requirement.

When the coil temperature Tp<23°C, the fan 14 enters the cold wind prevention mode of the fan 14 when it is turned on (step S5). Specifically, when the coil temperature Tp<23°C, the fan 14 is turned off within the first and third predetermined time period after the floor-standing cabinet 1 receives the heating signal, and then the fan 14 is in the second and third Start running at the first predetermined speed within the predetermined time period, run at the second predetermined speed during the third third predetermined time period, and enter the heating operation mode of the fan at the third predetermined time period after the third predetermined time period. Run at a predetermined speed. The third predetermined speed is greater than the second predetermined speed, and the second predetermined speed is greater than the first predetermined speed. The third predetermined period of time is shorter than the first predetermined period of time and longer than the second predetermined period of time. In one or more embodiments, the third predetermined period of time may be 20 seconds (s). Correspondingly, the fan 14 does not start in the first 20s; in the second 20s, the fan 14 runs at a first predetermined speed (for example, 450r/min) at a low speed; in the third 20s, the fan 14 enters the second predetermined speed (For example, 700r/min) for intermediate speed operation; after the third 20s (that is, after 1min), directly enter the third predetermined speed (for example, 900r/min) for normal high-speed operation.

Fig. 5 is a flowchart of a second embodiment of the control method for preventing cold wind when the air conditioner is heated and turned on according to the present invention. As shown in FIG. 5, when the floor-standing cabinet 1 receives a heating signal, the control method executes step S1 to detect the coil temperature Tp of the floor-standing cabinet 1.

When 23°C≤coil temperature Tp≤40°C, the guide plate (not shown in the figure) covering the air outlet is slid open, and the air outlet louver 11 enters the user-set angle according to the user's setting (step S6).

When 23°C≤coil temperature Tp≤40°C, the compressor will start to enter the anti-cold wind mode of the compressor after receiving the heating signal and delaying the second predetermined period of time after the floor-standing cabinet 1 receives the heating signal (step S7). In one or more embodiments, the second predetermined time period is also 1s. Alternatively, the second predetermined period of time may also be a longer or shorter period of time. The cold wind prevention mode of the compressor includes: the compressor runs at a second predetermined frequency (for example, 30Hz) for a third predetermined period of time at a low frequency, and then enters the heating operation mode of the compressor to operate at the first predetermined frequency (for example, 78Hz) ( That is, the normal heating operation mode). The first predetermined frequency is greater than the second predetermined frequency. The third predetermined time period may be greater than the second predetermined time period. In one or more embodiments, the third predetermined period of time may be 20 seconds (s).

When 23°C≤coil temperature Tp≤40°C, the fan 14 enters the cold wind prevention mode of the fan 14 when it is turned on (step S8). Specifically, when 23°C≤coil temperature Tp<30°C, the fan 14 is turned off for the first and third predetermined time period (for example, 20s) after the floor-standing cabinet 1 receives the heating signal, and then the fan 14 Perform low-speed operation at a first predetermined speed (for example, 450r/min) within the second and third predetermined time period (for example, 20s), and enter the fan 14 after the second and third predetermined time period (for example, 20s) The heating operation mode performs normal high-speed operation at a third predetermined speed (for example, 900 r/min). The third predetermined speed is greater than the first predetermined speed. When 30°C ≤ coil temperature Tp ≤ 40°C, the fan 14 will operate at the first predetermined speed (for example, 450r/ min) run at a low speed, and then the fan 14 runs at a second predetermined speed (e.g. 700r/min) within a second and third predetermined time period (e.g., 20s) at a mid-speed operation, and during the second and third predetermined time period (For example, 20s), enter the heating operation mode of the fan and run at the third predetermined speed (for example, 900r/min). The third predetermined speed is greater than the second predetermined speed, and the second predetermined speed is greater than the first predetermined speed.

Fig. 6 is a flowchart of the third embodiment of the control method for preventing cold wind when the air conditioner is turned on and heating according to the present invention. As shown in FIG. 6, when the floor-standing cabinet 1 receives a heating signal, the control method executes step S1 to detect the coil temperature Tp of the floor-standing cabinet 1.

When the coil temperature Tp>40°C, the guide plate (not shown in the figure) covering the air outlet is slid away, and the air outlet louver 11 enters the user-set angle according to the user's setting (step S9).

When the coil temperature Tp>40°C, the fan 14 starts to operate in the heating operation mode of the fan 14 after a second predetermined period of time after the floor-standing cabinet 1 receives the heating signal (step S10). In one or more embodiments, the second predetermined time period is 1 s. One second after the floor-standing cabinet 1 receives the heating signal, the fan starts to run directly at a predetermined high speed (for example, 900r/min).

When the coil temperature Tp>40°C, the compressor starts to run in the heating operation mode of the compressor after a fourth predetermined period of time after the floor-standing cabinet 1 receives the heating signal (step S11). The fourth predetermined time period is longer than the second predetermined time period. In one or more embodiments, the fourth predetermined period of time may be 2s. Two seconds after the floor-standing cabinet 1 receives the heating signal, the compressor starts to operate in a normal heating mode at a predetermined first frequency (for example, 78 Hz). In an alternative embodiment, the fourth predetermined period of time may be longer or shorter than 2s.

Therefore, when the coil temperature Tp>40°C, both the compressor and the fan are controlled by the normal heating control mode. The normal heating control mode means that when the air conditioner control system receives the heating signal, it first slides the guide plate of the indoor unit, and puts the horizontal and vertical louvers of the air outlet at the default air supply angle (that is, the horizontal and vertical louvers enter the default horizontal and horizontal Vertical state), and then switch to the user setting state. At the same time, the fan starts and enters the predetermined speed (for example, 900r/min), and the compressor is also started and the frequency is increased directly to the predetermined frequency (for example, 78Hz). When the frequency of the compressor is 58Hz/88Hz on the oil return platform, it enters the corresponding oil return platform to run, for example, 1min, and then enters the predetermined frequency (78Hz).

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

A control method for preventing cold wind when the air conditioner is turned on for heating, including:

When the indoor unit of the air conditioner receives a heating signal, detecting the coil temperature Tp of the indoor unit;

Based on the coil temperature Tp, control the air supply angle of the air outlet of the indoor unit and control the compressor of the air conditioner and the fan of the indoor unit to operate in the corresponding start-up anti-cold wind mode and/or heating operation mode .
The control method for preventing cold wind when the air conditioner heating is turned on according to claim 1, wherein, when the coil temperature Tp is less than 23°C:

The air outlet first enters the minimum air supply angle and enters the user-set angle after the first predetermined period of time;

The compressor starts to run in the heating operation mode of the compressor after a delay of a second predetermined period of time after the indoor unit receives the heating signal; and

The fan enters the anti-cold wind mode when the fan is turned on,

Wherein, the first predetermined time period is longer than the second predetermined time period.
The control method for preventing cold wind when the air conditioner heating is turned on according to claim 2, wherein when the coil temperature Tp is less than 23°C, the cold wind prevention mode of the fan when the fan is turned on comprises:

The fan is turned off for the first and third predetermined time period after the indoor unit receives the heating signal, and then the fan is turned on for the first and third predetermined time period after the indoor unit receives the heating signal. Operate at a predetermined speed, operate at a second predetermined speed within the third predetermined period of time, and enter the heating operation mode of the fan at a third predetermined speed after the third predetermined period of time run,

Wherein the third predetermined speed is greater than the second predetermined speed, and the second predetermined speed is greater than the first predetermined speed; and

Wherein, the third predetermined time period is shorter than the first predetermined time period and longer than the second predetermined time period.
The control method for preventing cold wind when the air conditioner heating is turned on according to claim 2, wherein, when the coil temperature Tp is less than 23°C, the compressor operates in the heating operation mode of the compressor include:

The compressor operates at a first predetermined frequency.
The control method for preventing cold wind when the air conditioner heating is turned on according to claim 1, wherein when the coil temperature Tp is greater than or equal to 23°C and less than or equal to 40°C:

The air outlet enters the angle set by the user;

The compressor starts to enter the anti-cold wind mode of the compressor after being delayed for a second predetermined time period after the indoor unit receives the heating signal; and

The fan enters the cold wind prevention mode when the fan is turned on.
The control method for preventing cold wind when the air conditioner heating is turned on according to claim 5, wherein the cold wind preventing mode of the compressor when the compressor is turned on comprises:

The compressor first runs at a second predetermined frequency for a third predetermined period of time, and then enters the heating operation mode of the compressor to run at the first predetermined frequency,

Wherein the first predetermined frequency is greater than the second predetermined frequency, and

Wherein, the third predetermined time period is greater than the second predetermined time period.
The control method for preventing cold wind when the air conditioner is turned on for heating according to claim 5, wherein the cold wind preventing mode of the fan when the fan is turned on comprises:

When the coil temperature Tp is greater than or equal to 23°C and less than 30°C, the fan is turned off for the first and third predetermined time period after the indoor unit receives the heating signal, and then the The fan runs at a first predetermined speed during the second said third predetermined time period, and enters the heating operation mode of the fan after the second said third predetermined time period and runs at a third predetermined speed,

Wherein, the third predetermined speed is greater than the first predetermined speed.
The control method for preventing cold wind when the air conditioner is turned on for heating according to claim 5, wherein the cold wind preventing mode of the fan when the fan is turned on comprises:

When the coil temperature Tp is greater than or equal to 30°C and less than or equal to 40°C, the fan runs at the first predetermined speed during the first third predetermined time period after the indoor unit receives the heating signal , And then the fan operates at a second predetermined speed during the second said third predetermined period of time, and enters the heating operation mode of the said fan at the third predetermined period of time after the second said third predetermined period of time Speed running,

Wherein, the third predetermined speed is greater than the second predetermined speed, and the second predetermined speed is greater than the first predetermined speed.
The control method for preventing cold wind when the air conditioner heating is turned on according to claim 1, wherein, when the coil temperature Tp is greater than 40°C:

The air outlet enters the angle set by the user;

The fan starts to run in the heating operation mode of the fan after the indoor unit receives the heating signal and is delayed for a second predetermined period of time; and

The compressor starts to run in the heating operation mode of the compressor after the indoor unit receives the heating signal and is delayed for a fourth predetermined period of time,

Wherein, the fourth predetermined time period is longer than the second predetermined time period.
The control method for preventing cold wind when the air conditioner is heated and turned on according to claim 1, wherein the air outlet includes horizontal louvers and vertical louvers that can adjust the air supply angle.