Air conditioner

Abstract

The present invention provides an air conditioner, which includes: when it is of the third type, the fresh air fan operates at a first speed, and the rotation speed of the fresh air fan is determined to be maintained or increased according to the indoor carbon dioxide concentration value, and the increase amplitude of the rotation speed of the fresh air fan is determined according to the current operating time point of the air conditioner; when it is not of the third type, when the indoor carbon dioxide concentration reaches a second preset concentration and the air conditioner operates within a first preset time period, it is determined whether it is of the first type. When it is of the first type, the fresh air fan operates at a second speed, and the rotation speed of the fresh air fan is increased, decreased or maintained according to the indoor carbon dioxide concentration value, or the rotation speed of the fresh air fan is determined according to the indoor carbon dioxide concentration and the outdoor carbon dioxide concentration. When the rotation speed of the fresh air fan reaches the maximum fresh air fan rotation speed acceptable to the first type of user, it operates at the maximum fresh air fan rotation speed. When the rotation speed of the fresh air fan cannot reach the maximum fresh air fan rotation speed, it operates at the determined fresh air fan rotation speed, which meets the needs of different users.

Description

Technical Field

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

[0002] In order to improve the quality of the user's living environment, the air conditioner indoor unit is provided with a fresh air function to introduce outdoor fresh air. The fresh air air conditioner includes a fresh air module, and the fresh air module includes a fresh air fan. When the rotation speed of the fresh air fan is relatively high, the introduction amount of fresh air can be increased. At present, the rotation speed of some fresh air fans can be adjusted according to the indoor carbon dioxide concentration, so that the indoor air quality is improved to a certain extent. However, the differences among users are not considered. The ages, number of users, usage time, airtightness of the usage environment, and sound insulation conditions of different users are all different, resulting in different demands for fresh air volume by users, and different users also have different acceptance levels of the noise generated by the fresh air fan. Therefore, it is inappropriate to determine the rotation speed of the fresh air fan only based on the carbon dioxide content. This method is difficult to meet the needs of users and results in a poor user experience. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0004] To this end, according to an embodiment of the present disclosure, an air conditioner is proposed, including:

[0005] An outdoor carbon dioxide sensor for detecting the outdoor carbon dioxide concentration;

[0006] An indoor fan;

[0007] A fresh air module for introducing outdoor fresh air into the room, the fresh air module including a fresh air fan;

[0008] An indoor carbon dioxide sensor for detecting the indoor carbon dioxide concentration;

[0009] A controller configured to:

[0010] When the indoor carbon dioxide concentration reaches the first preset concentration and the outdoor carbon dioxide concentration is below the indoor carbon dioxide concentration, determine whether the user type of the air conditioner is the third type. When the user type is the third type, the fresh air fan operates at the first speed, and then determine whether to keep or increase the speed of the fresh air fan according to the indoor carbon dioxide concentration value and determine the amplitude of the increase in the speed of the fresh air fan according to the current operating time point of the air conditioner. When the user type is not the third type, determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration reaches the second preset concentration and the air conditioner operates within the first preset time period, determine whether the user type of the air conditioner is the first type. When the user type is the first type, the fresh air fan operates at the second speed, and then increase the speed of the fresh air fan or decrease the speed of the fresh air fan or keep the current speed according to the indoor carbon dioxide concentration value.

[0011] According to an embodiment of the present disclosure, an air conditioner is further provided, including:

[0012] An outdoor carbon dioxide sensor for detecting the outdoor carbon dioxide concentration;

[0013] An indoor fan;

[0014] A fresh air module for introducing outdoor fresh air into the room, the fresh air module includes a fresh air fan;

[0015] An indoor carbon dioxide sensor for detecting the indoor carbon dioxide concentration;

[0016] A controller configured to:

[0017] When the indoor carbon dioxide concentration reaches the first preset concentration and the outdoor carbon dioxide concentration is below the indoor carbon dioxide concentration, determine whether the user type of the air conditioner is the third type. When the user type is the third type, the fresh air fan operates at the first speed, and then determine whether to keep or increase the speed of the fresh air fan according to the indoor carbon dioxide concentration value and determine the amplitude of the increase in the speed of the fresh air fan according to the current operating time point of the air conditioner. When the user type is not the third type, determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration reaches the second preset concentration and the air conditioner operates within the first preset time period, determine whether the user type of the air conditioner is the first type. When the user type is the first type, determine the speed of the fresh air fan according to the indoor carbon dioxide concentration and the outdoor carbon dioxide concentration. When the speed of the fresh air fan reaches the maximum fresh air fan speed acceptable to the first type of user, operate at the maximum fresh air fan speed acceptable to the first type of user. When the speed of the fresh air fan does not reach the maximum fresh air fan speed acceptable to the first type of user, operate at the determined fresh air fan speed.

[0018] In this application, an indoor carbon dioxide sensor and an outdoor carbon dioxide sensor are set up to detect carbon dioxide indoors and outdoors. In this application, two types of user types, namely the third type and the first type, are set up. According to different user types, it can be selected whether to mainly consider the carbon dioxide concentration as the main parameter or the fresh air fan noise as the main parameter. Considering the carbon dioxide concentration and the time point of air conditioner operation, the rotation speed of the fresh air fan is considered, so that the rotation speed of the fresh air fan is suitable for the demand of the third type of users for low carbon dioxide concentration and the requirement of the first type of users for low noise. This application takes into account different user types and can be customized, meeting the needs of different users. While considering different users, this application also takes into account the different scenario needs of users, enabling users to live a healthier life.

[0019] According to an embodiment of the present disclosure, the controller is configured to: when the user type is the first type and the fresh air fan operates at the second rotation speed, determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan maintains the second rotation speed. When the indoor carbon dioxide concentration reaches the second preset concentration, determine whether the indoor carbon dioxide concentration reaches the third preset concentration; when the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at the twelfth rotation speed and the twelfth rotation speed is greater than the second rotation speed; when the indoor carbon dioxide concentration does not reach the third preset concentration, the rotation speed of the fresh air fan remains unchanged or decreases. When it comes to the first type of users, when fresh air needs to be introduced, it first operates at a lower rotation speed and then increases the rotation speed of the fresh air fan when the fresh air volume requirement cannot be met, so that a small noise is generated first and a larger noise is generated when the fresh air volume requirement cannot be met, which can avoid the impact of a large noise at the beginning on the first type of users.

[0020] According to an embodiment of the present disclosure, the controller is configured to: when the indoor carbon dioxide concentration does not reach the third preset concentration, determine whether to reduce the first fixed rotation speed or keep the rotation speed of the fresh air fan unchanged according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before it, specifically: determine whether the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before it; when the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before it, the rotation speed of the fresh air fan remains unchanged; when the current indoor carbon dioxide concentration does not reach the carbon dioxide concentration at the first time before it, the rotation speed of the fresh air fan is reduced by the first fixed rotation speed.

[0021] According to an embodiment of the present disclosure, the controller is configured to: after the rotation speed of the fresh air fan is reduced by the first fixed rotation speed, determine whether the indoor carbon dioxide concentration reaches the first preset concentration. When the indoor carbon dioxide concentration reaches the first preset concentration, determine whether to reduce the first fixed rotation speed or keep the rotation speed of the fresh air fan unchanged according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before it.

[0022] According to an embodiment of the present disclosure, the controller is configured to: after the fresh air fan operates at a first speed, determine whether the indoor carbon dioxide concentration reaches a second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan maintains the first speed. When the indoor carbon dioxide concentration reaches the second preset concentration, determine an increased speed of the fresh air fan according to the current operating time point of the air conditioner, and then the fresh air fan operates at the sum of the first speed and the increased speed. When serving users of the third type, mainly considering that a lower indoor carbon dioxide concentration is required, and according to different requirements for carbon dioxide and different requirements for noise at different times, the increase amount of the speed is determined targeted to improve the user experience.

[0023] According to an embodiment of the present disclosure, the controller is configured to: after the indoor carbon dioxide concentration reaches the second preset concentration, determine whether the current operating time point of the air conditioner is within a first preset time period. When the current operating time point of the air conditioner is within the first preset time period, the fresh air fan operates at a third speed. When the current operating time point of the air conditioner is not within the first preset time period, the fresh air fan operates at a fourth speed.

[0024] According to an embodiment of the present disclosure, the controller is further configured to: when the user type is not the first type, determine whether the user type is the second type. When the user type is the second type, the fresh air fan operates at a fifth speed, and then determine the indoor carbon dioxide concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan maintains the fifth speed. When the indoor carbon dioxide concentration reaches the second preset concentration and does not reach the third preset concentration, the fresh air fan operates at a sixth speed and the sixth speed is greater than the fifth speed. When the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at a seventh speed and the seventh speed is greater than the sixth speed. The present application also sets users of the second type, who have requirements for the carbon dioxide concentration, and through multiple judgments, ensure that the carbon dioxide is within a suitable range to improve the user experience.

[0025] According to an embodiment of the present disclosure, the controller is further configured to: after the fresh air fan operates at the seventh speed, continue to monitor the indoor carbon dioxide concentration, determine whether to reduce or maintain the speed of the fresh air fan according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before. After driving the speed of the fresh air fan to decrease, determine whether to stop or continue to work for the fresh air fan according to the relationship between the indoor carbon dioxide concentration and the first preset concentration. After the fresh air fan is determined to continue to work, determine whether to reduce or maintain the speed of the fresh air fan according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before. After determining that the speed of the fresh air fan is maintained, drive the fresh air fan to operate at the sixth speed or the seventh speed according to the relationship between the indoor carbon dioxide concentration and the third preset concentration

[0026] According to an embodiment of the present disclosure, the air conditioner further includes:

[0027] an indoor temperature sensor for detecting the indoor temperature;

[0028] The controller is configured to:

[0029] when the user type is not the second type, the fresh air fan operates at the eighth speed, and then determines whether the temperature difference of the indoor temperature within the second time period reaches the first preset temperature;

[0030] when the temperature difference of the indoor temperature within the second time period reaches the first preset temperature, turn on the air conditioner for cooling or heating for temperature compensation, or adjust the operating parameters of the air conditioner for cooling or heating for temperature compensation;

[0031] when the temperature difference of the indoor temperature within the second time period does not reach the first preset temperature, determine the relationship between the indoor carbon dioxide concentration and the second preset concentration and the third preset concentration, the third preset concentration is greater than the second preset concentration, when the indoor carbon dioxide concentration reaches the second preset concentration, the rotation speed of the fresh air fan remains unchanged, when the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at the thirteenth speed, the thirteenth speed is greater than the eighth speed. In addition to considering the carbon dioxide concentration and noise, the present application also considers the change of the indoor temperature, adapts to the needs of temperature-sensitive customers, increases the applicable range of users, and meets the needs of more users. Description of the Drawings

[0032] 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, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 is a flowchart of an air conditioner according to an embodiment of the present application;

[0034] Figure 2 is another flowchart of an air conditioner according to an embodiment of the present application;

[0035] Figure 3 is another flowchart of an air conditioner according to an embodiment of the present application;

[0036] Figure 4 is another flowchart of an air conditioner according to an embodiment of the present application;

[0037] Figure 5 is another flowchart of an air conditioner according to an embodiment of the present application;

[0038] Figure 6 Another flowchart of the air conditioner according to an embodiment of the present application;

[0039] Figure 7 Cross-sectional structure diagram of the indoor unit of the air conditioner according to an embodiment of the present application;

[0040] Figure 8 Is Figure 7 Partial enlarged view at position A in

[0041] Figure 9 Cross-sectional structure diagram of the indoor unit of the air conditioner in another state according to an embodiment of the present application;

[0042] Figure 10 Is Figure 9 Partial enlarged view at position B in

[0043] Figure 11 Is Figure 10 Partial enlarged view at position C in

[0044] Figure 12 Partial cross-sectional structure diagram of the indoor unit of the air conditioner according to an embodiment of the present application;

[0045] Figure 13 Another cross-sectional structure diagram of the indoor unit of the air conditioner according to an embodiment of the present application;

[0046] Figure 14 Is Figure 13 Partial enlarged view at position E in

[0047] Figure 15 Flow path diagram of the air outlet from the first air outlet according to an embodiment of the present application;

[0048] Figure 16 Top view structure diagram of the indoor unit of the air conditioner according to an embodiment of the present application;

[0049] Figure 17 Is Figure 16 Partial enlarged view at position F in

[0050] Figure 18 Another top view structure diagram of the indoor unit of the air conditioner according to an embodiment of the present application;

[0051] Figure 19 Another top view structure diagram of the indoor unit of the air conditioner according to an embodiment of the present application;

[0052] Figure 20 Flow path diagram of the air outlet from the side air outlet according to an embodiment of the present application;

[0053] Figure 21 Another cross-sectional structure diagram of the indoor unit of the air conditioner according to an embodiment of the present application;

[0054] Figure 22 It is another partial sectional view structure diagram of an air conditioner indoor unit according to an embodiment of the present application.

[0055] In the above figures: air conditioner indoor unit 10; housing 1; heat exchange air inlet 11; heat exchange air outlet 12; heat exchange air duct 13; heat exchange air duct side wall 131; front volute tongue 1311; connection surface 13111; first front volute tongue 13112; second front volute tongue 13113; front end surface of volute tongue 13114; rear volute tongue 1312; front panel 14; first air outlet 141; first air outlet grille 142; first air outlet grille bar 1421; first grille air duct 1422; first arc surface 14211; second arc surface 14212; first panel section 143; second panel section 144; third panel section 145; arc surface 1451; air inlet panel 15; first air duct 16; inner wall of first air duct 161; fresh air exhaust outlet 1611; deflector 17; ventilation opening 18; side end plate 19; side air outlet 191; side air outlet grille 192; side air outlet grille bar 1921; first side surface 19211; second side surface 19212; side grille air duct 1922; indoor fan 31; indoor heat exchanger 32; air deflector 33; air damper 34; rotating column 341; cylindrical surface 3411; door body 342; first end of air damper 343; first connection position 51; second connection position 52; third connection position 53; water receiving tray 54; bottom plate of water receiving tray 542; support rib plate 543; indoor top wall 61; indoor side wall 62. Specific Embodiments

[0056] Hereinafter, the present invention will be specifically described by way of exemplary embodiments. However, it should be understood that, without further narration, the elements, structures and features in one embodiment can also be beneficially combined into other embodiments.

[0057] The present application proposes an air conditioner, which will be described below with reference to Figures 1 - 22 The air conditioner includes an air conditioner indoor unit 10 and an air conditioner outdoor unit.

[0058] Referring to Figure 7 , the air conditioner indoor unit 10 includes a housing 1, an indoor fan 31 and an indoor heat exchanger 32. The housing 1 is provided with a heat exchange air inlet 11 and a heat exchange air outlet 12, and a heat exchange air duct 13 is further provided inside the housing 1. The heat exchange air duct 13 communicates with the heat exchange air inlet 11 and the heat exchange air outlet 12.

[0059] The indoor heat exchanger 32 is disposed inside the housing 1 and within the heat exchange air duct 13. The indoor heat exchanger 32 is disposed at the heat exchange air inlet and on the inner side of the heat exchange air inlet. The indoor heat exchanger is used for exchanging heat with the air entering the heat exchange air duct.

[0060] The indoor blower 31 is disposed inside the machine casing 1 and within the heat exchange air duct 13. The indoor blower 31 is used to provide power for the flow of air. Driven by the indoor blower 31, the indoor air enters the heat exchange air duct 13 through the heat exchange air inlet 11. The air entering the heat exchange air duct 31 exchanges heat with the indoor heat exchanger at the indoor heat exchanger, and the heat-exchanged air flows out of the heat exchange air duct through the heat exchange air outlet.

[0061] The air conditioner outdoor unit includes an outdoor machine casing, an outdoor blower, and an outdoor heat exchanger.

[0062] The outdoor machine casing is provided with an outdoor air inlet and an outdoor air outlet. An outdoor air duct is provided inside the outdoor machine casing, and the outdoor air duct communicates with the outdoor air inlet and the outdoor air outlet.

[0063] The outdoor heat exchanger is disposed inside the outdoor machine casing and within the outdoor air duct. The outdoor heat exchanger is located at the outdoor air inlet and on the inner side of the outdoor air inlet. The outdoor heat exchanger is used to exchange heat with the air entering the outdoor air duct.

[0064] The outdoor blower is disposed inside the outdoor machine casing and within the outdoor air duct. The outdoor blower is used to provide power for the flow of air. Driven by the outdoor blower, the outdoor air enters the outdoor air duct through the outdoor air inlet. The air entering the outdoor air duct exchanges heat with the outdoor heat exchanger at the outdoor heat exchanger, and the heat-exchanged air flows out of the outdoor air duct through the outdoor air outlet.

[0065] The air conditioner further includes a compressor and an expansion valve. The compressor is disposed inside the outdoor machine casing. The compressor compresses the refrigerant gas in a low-temperature and low-pressure state and discharges the refrigerant gas in a high-temperature and high-pressure state. The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant.

[0066] Among the indoor heat exchanger and the outdoor heat exchanger, one of them is a condenser and the other is an evaporator. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled.

[0067] The air conditioner has a refrigerant circuit. The refrigerant circuit is annularly connected to the compressor, the condenser, the expansion valve, and the evaporator in sequence to circulate the refrigerant. The air conditioner includes a refrigeration mode and a heating mode. In the refrigeration mode, the indoor heat exchanger is an evaporator and the outdoor heat exchanger is a condenser. The refrigerant circulates in sequence through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger. In the heating mode, the indoor heat exchanger is a condenser and the outdoor heat exchanger is an evaporator. The refrigerant circulates in sequence through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger.

[0068] The air conditioner further includes a fresh air module for introducing outdoor fresh air into the room, which can improve the indoor air quality. The fresh air module includes a fresh air fan.

[0069] The air conditioner further includes an outdoor carbon dioxide sensor for detecting the outdoor carbon dioxide concentration.

[0070] The outdoor carbon dioxide sensor is provided on the outdoor unit of the air conditioner. Specifically, the outdoor carbon dioxide sensor can be provided on the outdoor casing. Specifically, the outdoor carbon dioxide sensor can be provided inside the outdoor air inlet.

[0071] The air conditioner further includes an indoor carbon dioxide sensor for detecting the indoor carbon dioxide concentration.

[0072] The indoor carbon dioxide sensor is provided on the indoor unit of the air conditioner. Specifically, the indoor carbon dioxide sensor can be provided on the casing. Specifically, the indoor carbon dioxide sensor can be provided inside the indoor air inlet.

[0073] The air conditioner further includes an indoor temperature sensor for detecting the indoor temperature. The indoor temperature sensor is provided on the indoor unit of the air conditioner. Specifically, the indoor temperature sensor can be provided on the casing. Specifically, the indoor temperature sensor can be provided inside the indoor air inlet.

[0074] The air conditioner further 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 interface to an nth interface for input / output, a communication bus (Bus), etc.

[0075] The controller controls the operation of the air conditioner and responds to the user's operations through various software control programs stored in the memory. The controller controls the overall operation of the air conditioner. For example: in response to a received operation instruction for output, the controller can perform operations related to the components selected by the operation instruction.

[0076] The controller is connected to the indoor fan, the outdoor fan, the compressor, the indoor temperature sensor, the indoor carbon dioxide sensor, and the outdoor carbon dioxide sensor. The controller can receive the values detected by the indoor temperature sensor, the indoor carbon dioxide sensor, and the outdoor carbon dioxide sensor, and control the working states of the indoor fan, the outdoor fan, the compressor, the expansion valve, etc. according to the logic set by itself, so that the air conditioner works normally.

[0077] The controller is configured to:

[0078] When the indoor carbon dioxide concentration reaches a first preset concentration and the outdoor carbon dioxide concentration is below the indoor carbon dioxide concentration, determine whether the user type of the air conditioner is a third type. When the user type is the third type, the fresh air fan operates at a first speed, and then determines whether to maintain or increase the speed of the fresh air fan according to the indoor carbon dioxide concentration value and determines the amplitude of the increase in the speed of the fresh air fan according to the current operating time point of the air conditioner. When the user type is not the third type, determine whether the indoor carbon dioxide concentration reaches a second preset concentration. When the indoor carbon dioxide concentration reaches the second preset concentration and the air conditioner is operating within a first preset time period, determine whether the user type of the air conditioner is a first type. When the user type is the first type, the fresh air fan operates at a second speed, and then increases the speed of the fresh air fan, decreases the speed of the fresh air fan, or maintains the current speed according to the indoor carbon dioxide concentration value.

[0079] Alternatively, the controller is configured to:

[0080] When the indoor carbon dioxide concentration reaches a first preset concentration and the outdoor carbon dioxide concentration is below the indoor carbon dioxide concentration, determine whether the user type of the air conditioner is a third type. When the user type is the third type, the fresh air fan operates at a first speed, and then determines whether to maintain or increase the speed of the fresh air fan according to the indoor carbon dioxide concentration value and determines the amplitude of the increase in the speed of the fresh air fan according to the current operating time point of the air conditioner. When the user type is not the third type, determine whether the indoor carbon dioxide concentration reaches a second preset concentration. When the indoor carbon dioxide concentration reaches the second preset concentration and the current operating time point of the air conditioner is within a first preset time period, determine whether the user type of the air conditioner is a first type. When the user type is the first type, determine the speed of the fresh air fan according to the indoor carbon dioxide concentration and the outdoor carbon dioxide concentration. When the speed of the fresh air fan reaches the maximum fresh air fan speed acceptable to the first type of user, operate at the maximum fresh air fan speed acceptable to the first type of user. When the speed of the fresh air fan does not reach the maximum fresh air fan speed acceptable to the first type of user, operate at the determined fresh air fan speed.

[0081] In this application, an indoor carbon dioxide sensor and an outdoor carbon dioxide sensor are set up to detect carbon dioxide indoors and outdoors. In this application, two types of user types, namely the third type and the first type, are set up. According to different user types, it is possible to choose whether to mainly consider the carbon dioxide concentration as the main parameter or the noise of the fresh air fan as the main parameter. Considering the carbon dioxide concentration and the time point of air conditioner operation, the rotation speed of the fresh air fan is adjusted, so that the rotation speed of the fresh air fan is suitable for the demand of the third type of users for low carbon dioxide concentration and the requirement of the first type of users for low noise. This application takes into account different user types and can perform personalized settings to meet the needs of different users. While considering different users, this application also takes into account the different scenario needs of users, enabling users to live a healthier life.

[0082] Specifically, referring to Figure 1 , the controller executes the following steps:

[0083] S111: Obtain the indoor carbon dioxide concentration;

[0084] S112: Determine whether the indoor carbon dioxide concentration reaches the first preset concentration. When the indoor carbon dioxide concentration does not reach the first preset concentration, end. When the indoor carbon dioxide concentration reaches the first preset concentration, execute the next step;

[0085] S113: Obtain the outdoor carbon dioxide concentration;

[0086] S114: Determine whether the outdoor carbon dioxide concentration is below the indoor carbon dioxide concentration. When the outdoor carbon dioxide concentration is not below the indoor carbon dioxide concentration, end; when the outdoor carbon dioxide concentration is below the indoor carbon dioxide concentration, execute the next step:

[0087] S115: Determine whether the user type of the air conditioner is the third type. When the user type is the third type, execute step S116; when the user type is not the third type, execute S117;

[0088] S116: The fresh air fan operates at the first rotation speed, and then execute S210;

[0089] S117: Determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, end. When the indoor carbon dioxide concentration reaches the second preset concentration, execute the next step;

[0090] S118: Obtain the current time point when the air conditioner is operating;

[0091] S119: Determine whether the current time point when the air conditioner is operating is within the first preset time period. When the current time point when the air conditioner is operating is within the first preset time period, execute the next step:

[0092] S120: Determine whether the user type of the air conditioner is the first type. When the user type is the first type, execute S121;

[0093] S121: The fresh air fan operates at the second speed, and then execute S310 or S410;

[0094] S310: According to the indoor carbon dioxide concentration value, increase the speed of the fresh air fan, decrease the speed of the fresh air fan, or keep the current speed running.

[0095] S410: Determine the speed of the fresh air fan according to the indoor carbon dioxide concentration and the outdoor carbon dioxide concentration. When the speed of the fresh air fan reaches the maximum speed of the fresh air fan acceptable to the first type of user, operate at the maximum speed of the fresh air fan acceptable to the first type of user. When the speed of the fresh air fan does not reach the maximum speed of the fresh air fan acceptable to the first type of user, operate at the determined speed of the fresh air fan.

[0096] S210: Determine that the speed of the fresh air fan remains the same or increases according to the indoor carbon dioxide concentration value, and determine the amplitude of the increase in the speed of the fresh air fan according to the current operating time point of the air conditioner.

[0097] Among them, the first preset concentration of carbon dioxide can be 600 ppm, and the second preset concentration of carbon dioxide can be 1600 ppm.

[0098] The second speed is lower than the first speed.

[0099] It is possible to set that the fresh air fan has multiple speed segments that increase in sequence. Among them, the first speed is within one of the speed segments. Specifically, the first speed may not be within the lowest speed segment and the highest speed segment. Among them, the second speed is also within one of the speed segments. Specifically, the second speed may be within the lowest speed segment or the second lowest speed segment, or the second speed is within a lower speed segment, and the higher speed segment is at least as many as the lower speed segment.

[0100] Among them, the fresh air fan can have a silent speed gear, a low speed gear, a medium speed gear, a high speed gear, and a strong speed gear. The first speed is the medium speed gear. The second speed is the silent speed gear.

[0101] When the fresh air fan operates at the silent speed gear, low speed gear, medium speed gear, and high speed gear respectively, the noises are 22 dBA, 24.3 dBA, 31.9 dBA, and 36.3 dBA respectively. When the fresh air fan operates at the low speed gear, medium speed gear, high speed gear, and strong speed gear respectively, the fresh air volumes are 15.9 m3 / h, 25.5 m3 / h, 30.6 m3 / h, and 50 m3 / h respectively.

[0102] When the fresh air fan rotates at 800 rpm, 900 rpm, 1000 rpm, 1100 rpm, 1200 rpm, 1300 rpm, 1400 rpm, 1500 rpm, 1600 rpm and 1700 rpm respectively, the noises are 22 dBA, 24.3 dBA, 26.2 dBA, 28.2 dBA, 30.2 dBA, 31.9 dBA, 34.2 dBA, 36.3 dBA, 38.2 dBA and 40.2 dBA respectively, and the fresh air volumes are 13.4 m3 / h, 15.9 m3 / h, 18.3 m3 / h, 20.7 m3 / h, 23.2 m3 / h, 25.5 m3 / h, 28.0 m3 / h, 30.6 m3 / h, 32.9 m3 / h and 35.4 m3 / h respectively.

[0103] The first preset time period can be a time period including 24:00 Beijing time. Specifically, the first preset time period can be from 20:00 to 7:00 the next day.

[0104] After an interval of time, step S111 will be executed, and the subsequent steps of step S111 will be executed accordingly.

[0105] The users of the third type of air conditioner can be users with relatively high air quality requirements. In this application, it mainly means that the user has relatively high requirements for the concentration of carbon dioxide in the room. Among them, the users of the third type require a relatively low concentration of carbon dioxide in the room. In this application, the users of the third type require that the indoor carbon dioxide cannot reach the first preset concentration. When the concentration of indoor carbon dioxide is higher than the first preset concentration, fresh air needs to be introduced to reduce the concentration of indoor carbon dioxide.

[0106] The users of the first type of air conditioner can be users with relatively high noise requirements. In this application, it mainly means that the user has relatively high requirements for the noise emitted by the rotation speed of the fresh air fan. Therefore, the users of the first type require a relatively low rotation speed of the fresh air fan. Among them, the noise generated in the silent rotation speed gear is the lowest, about 22 dBA. The requirement of the first type of user at night is that the medium rotation speed gear can be the highest gear, and the noise is about 32 dBA. At this time, the deep sleep duration is the best. When the noise is greater than 32 dBA, for every 1 dBA increase, the deep sleep time will be reduced by 4%.

[0107] In some embodiments of the present application, the controller is configured to: after the fresh air fan operates at the first speed, determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan maintains the first speed of operation. When the indoor carbon dioxide concentration reaches the second preset concentration, determine the increased speed of the fresh air fan according to the current operating time point of the air conditioner, and then the fresh air fan operates at the sum of the first speed and the increased speed. When serving the third type of user, mainly considering that the indoor carbon dioxide concentration needs to be relatively low, and according to the different needs for carbon dioxide and different noise requirements at different times, the increase amount of the speed is determined targeted to improve the user experience.

[0108] Specifically, referring to Figure 2 , after the fresh air fan operates at the first speed, execute the specific steps in S210. The specific steps of S210 include:

[0109] S211: Determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, execute S116; when the indoor carbon dioxide concentration reaches the second preset concentration, execute step S212;

[0110] S212: Determine the increased speed of the fresh air fan according to the current operating time point of the air conditioner, and then the fresh air fan operates at the sum of the first speed and the increased speed.

[0111] The controller is configured to: after the fresh air fan maintains the first speed of operation, determine whether to maintain or increase the speed of the fresh air fan according to the indoor carbon dioxide concentration value and determine the increase amplitude of the speed of the fresh air fan according to the current operating time point of the air conditioner.

[0112] Among them, S211 can be executed every certain period of time. Among them, S211 can be executed once every 15 minutes.

[0113] In some embodiments of the present application, the controller is configured to: after the indoor carbon dioxide concentration reaches the second preset concentration, determine whether the current operating time point of the air conditioner is within the first preset time period. When the current operating time point of the air conditioner is within the first preset time period, the fresh air fan operates at the third speed. When the current operating time point of the air conditioner is not within the first preset time period, the fresh air fan operates at the fourth speed.

[0114] Specifically, referring to Figure 2 , after the indoor carbon dioxide concentration reaches the second preset concentration, execute the specific steps in step S212. S212 includes the following steps:

[0115] S2121: Determine whether the current operating time point of the air conditioner is within the first preset time period. When the current operating time point of the air conditioner is within the first preset time period, execute S2122; when the current operating time point of the air conditioner is not within the first preset time period, execute S2123;

[0116] S2122: The fresh air fan operates at the third speed.

[0117] S2123: The fresh air fan operates at the fourth speed.

[0118] Specifically, the fourth speed is greater than the third speed, and the third speed is greater than the first speed. The third speed can be the high speed gear, and the fourth speed can be the strong speed gear.

[0119] In some embodiments of the present application, the controller is configured to: after the fresh air fan operates at the third speed and the fourth speed, determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan operates at the first speed, and then operates according to the logic after the fresh air fan operates at the first speed. When the indoor carbon dioxide concentration reaches the second preset concentration, then operate according to the logic after the indoor carbon dioxide concentration reaches the second preset concentration.

[0120] Specifically, the steps can be:

[0121] S2122: The fresh air fan operates at the third speed, and then execute S211;

[0122] S2123: The fresh air fan operates at the fourth speed, and then execute S211.

[0123] In some embodiments of the present application, the controller is configured to: when the user type is the first type and after the fresh air fan operates at the second speed, determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan maintains the second speed. When the indoor carbon dioxide concentration reaches the second preset concentration, determine whether the indoor carbon dioxide concentration reaches the third preset concentration; when the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at the twelfth speed and the twelfth speed is greater than the second speed; when the indoor carbon dioxide concentration does not reach the third preset concentration, the speed of the fresh air fan remains unchanged or decreases.

[0124] When it is a user of the first type, when fresh air needs to be introduced, it first operates at a smaller speed, and when the fresh air volume requirement cannot be met, the speed of the fresh air fan is increased, so that small noise is generated first, and when the fresh air volume requirement cannot be met, larger noise is generated, which can avoid the impact on users of the first type caused by generating larger noise at the beginning.

[0125] The controller is configured to: when the indoor carbon dioxide concentration does not reach the third preset concentration, determine that the fresh air fan speed is reduced to a first fixed speed or remains unchanged according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at a previous first time.

[0126] Specifically, determining whether the speed of the fresh air fan is reduced to a first fixed speed or remains unchanged based on the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before specifically includes: judging whether the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before; when the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before, the speed of the fresh air fan remains unchanged; when the current indoor carbon dioxide concentration does not reach the carbon dioxide concentration at the first time before, the speed of the fresh air fan is reduced to a first fixed speed.

[0127] The controller is configured to: after the fresh air fan speed is reduced to a first fixed speed, determine whether the indoor carbon dioxide concentration reaches a first preset concentration; when the indoor carbon dioxide concentration reaches the first preset concentration, determine whether the fresh air fan speed is reduced to the first fixed speed or remains unchanged based on the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before.

[0128] The controller is configured to: after the fresh air fan speed remains unchanged, determine that the fresh air fan runs at the twelfth speed, keeps the fresh air fan speed unchanged, or reduces the fresh air fan speed according to the relationship between the indoor carbon dioxide concentration and the third preset concentration.

[0129] The twelfth speed is greater than the second speed, wherein the twelfth speed can be a medium speed gear or a low speed gear. The first fixed speed can be 100 rpm. The third preset concentration of carbon dioxide can be 3000 ppm.

[0130] Specifically, refer to Figure 3 , step S310 includes:

[0131] S311: Determine whether the indoor carbon dioxide concentration reaches a second preset concentration. If the indoor carbon dioxide concentration does not reach the second preset concentration, then execute S121; if the indoor carbon dioxide concentration reaches the second preset concentration, execute S312;

[0132] S312: Determine whether the indoor carbon dioxide concentration reaches a third preset concentration; if the indoor carbon dioxide concentration reaches the third preset concentration, operate the fresh air fan at a twelfth speed, where the twelfth speed is greater than the second speed; then execute S312 again; if the indoor carbon dioxide concentration does not reach the third preset concentration, execute the next step;

[0133] S313: Determine whether the current indoor carbon dioxide concentration has reached the carbon dioxide concentration at the first time before; when the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before, keep the fresh air fan speed unchanged, and then execute S312; when the current indoor carbon dioxide concentration does not reach the carbon dioxide concentration at the first time before, reduce the fresh air fan speed by the first fixed speed.

[0134] Specifically, the step S310 further includes: after reducing the fresh air fan speed by the first fixed speed, execute step S314;

[0135] S314: Determine whether the indoor carbon dioxide concentration has reached the first preset concentration. When the indoor carbon dioxide concentration has not reached the first preset concentration, end. When the indoor carbon dioxide concentration has reached the first preset concentration, execute S313.

[0136] Among them, the concentration of indoor carbon dioxide can also be updated in real time. When the concentration of indoor carbon dioxide reaches the condition for gear change, the fresh air fan speed can be made to act accordingly, ensuring the carbon dioxide concentration while reducing noise. Of course, the concentration of indoor carbon dioxide can also be updated every once in a while. Among them, it can be updated once every 15 minutes.

[0137] Or, update the concentrations of indoor carbon dioxide and outdoor carbon dioxide in real time. When the user is a type-I user, after reducing the fresh air fan speed by the first fixed speed, executing S314 and not executing S314 can be carried out at intervals.

[0138] Or, execute S311, S312, and S314 every certain period of time. Among them, S311 and S312 can be executed once every 15 minutes, and S314 can be executed once every 30 minutes.

[0139] In some embodiments of the present application, the controller is further configured to: when the user type is not the first type, determine whether the user type is the second type. When the user type is the second type, the fresh air fan operates at the fifth speed, and then determine the indoor carbon dioxide concentration. When the indoor carbon dioxide concentration has not reached the second preset concentration, the fresh air fan keeps operating at the fifth speed. When the indoor carbon dioxide concentration has reached the second preset concentration and has not reached the third preset concentration, the fresh air fan operates at the sixth speed and the sixth speed is greater than the fifth speed. When the indoor carbon dioxide concentration has reached the third preset concentration, the fresh air fan operates at the seventh speed and the seventh speed is greater than the sixth speed.

[0140] Among them, the fifth speed is greater than the second speed. The fifth speed can be equal to the first speed. The sixth speed can be equal to the third speed. The seventh speed can be equal to the fourth speed. The fifth speed can be a medium speed gear. The sixth speed can be a high speed gear. The seventh speed can be a strong speed gear.

[0141] The controller is further configured to: after the fresh air fan operates at the sixth speed, continue to monitor the indoor carbon dioxide concentration, and drive the fresh air fan to reduce its speed, maintain its speed, or increase its speed according to the relationship between the indoor carbon dioxide concentration and the second preset concentration and the third preset concentration.

[0142] The controller is further configured to: after the fresh air fan operates at the seventh speed, continue to monitor the indoor carbon dioxide concentration, determine whether to reduce or maintain the speed of the fresh air fan according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before, after driving the fresh air fan to reduce its speed, determine whether to stop or continue to work the fresh air fan according to the relationship between the indoor carbon dioxide concentration and the first preset concentration, after the fresh air fan is determined to continue to work, determine whether to reduce or maintain the speed of the fresh air fan according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before, after determining to maintain the speed of the fresh air fan, drive the fresh air fan to operate at the sixth speed or the seventh speed according to the relationship between the indoor carbon dioxide concentration and the third preset concentration.

[0143] Specifically, referring to Figure 4 , in step S120, when the user type is not the first type, execute S122;

[0144] S122: Determine whether the user type is the second type. When the user type is the second type, execute S510; when the user type is not the second type, execute S610.

[0145] Specifically, S510 includes:

[0146] S511: The fresh air fan operates at the fifth speed;

[0147] S512: Determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, execute S513: when the indoor carbon dioxide concentration reaches the second preset concentration, execute S514;

[0148] S513: The fresh air fan maintains the fifth speed and then continues to execute S512;

[0149] S514: Determine whether the indoor carbon dioxide concentration reaches the third preset concentration; when the indoor carbon dioxide concentration does not reach the third preset concentration, the fresh air fan operates at the sixth speed and the sixth speed is greater than the fifth speed, and then execute S512: when the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at the seventh speed and the seventh speed is greater than the sixth speed, and then execute the next step;

[0150] S515: Determine whether the current indoor carbon dioxide concentration has reached the carbon dioxide concentration at the first time before. When the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before, keep the fresh air fan speed unchanged, and then execute S514; when the current indoor carbon dioxide concentration has not reached the carbon dioxide concentration at the first time before, reduce the fresh air fan speed by a second fixed speed, and then execute the next step;

[0151] S516: Determine whether the indoor carbon dioxide concentration has reached a first preset concentration. When the indoor carbon dioxide concentration reaches the first preset concentration, execute S515; when the indoor carbon dioxide concentration has not reached the first preset concentration, end.

[0152] The second fixed speed can be 100 rpm.

[0153] Execute S512, S514, and S516 at regular intervals. Among them, S512, S514, and S516 can be executed once every 15 minutes.

[0154] The users of the second type of air conditioner can be users with a high population density. The second type of users have higher requirements for carbon dioxide. Currently, the bedroom area is mostly 8 - 12 square meters, followed by 12 - 16 square meters. Taking a 10 - 12 square meter room as an example, the fresh air volume requirement at night is 22 - 30 m3 / h. When it is in the medium speed gear, the noise is about 32 - 33 dBA, which can make the user feel the fresh air and is beneficial to the user's deep sleep. When it is in the high speed gear, the noise is about 32 - 35 dBA, which can make the user feel the fresh and clean air; when it is in the strong speed gear, it can quickly replace the fresh air in the room.

[0155] This application also sets up a second type of user who has requirements for the carbon dioxide concentration. By making multiple judgments, it ensures that the carbon dioxide is within a suitable range and the noise is small, improving the user experience.

[0156] In some embodiments of the present application, the controller is configured to:

[0157] When the user type is not the second type, the fresh air fan operates at the eighth speed, and then determine whether the temperature difference of the indoor temperature within the second time period has reached the first preset temperature;

[0158] When the temperature difference of the indoor temperature within the second time period has reached the first preset temperature, turn on the air conditioner for cooling or heating for temperature compensation, or adjust the air conditioner cooling or heating operation parameters for temperature compensation;

[0159] When the temperature difference of the indoor temperature in the second time period does not reach the first preset temperature, judge the relationship between the indoor carbon dioxide concentration and the second preset concentration and the third preset concentration, and the third preset concentration is greater than the second preset concentration. When the indoor carbon dioxide concentration reaches the second preset concentration, the rotation speed of the fresh air fan remains unchanged. When the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at the thirteenth rotation speed, and the thirteenth rotation speed is greater than the eighth rotation speed.

[0160] The controller is further configured to: after turning on the air conditioner for refrigeration or heating for temperature compensation, or, after adjusting the operating parameters of the air conditioner for refrigeration or heating for temperature compensation, continue to monitor the indoor temperature and judge whether the temperature difference of the indoor temperature in the second time period reaches the first preset temperature.

[0161] The controller is configured to: after the fresh air fan operates at the thirteenth rotation speed, continue to monitor the concentration of indoor carbon dioxide, determine whether to reduce or maintain the rotation speed of the fresh air fan according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before. After driving the rotation speed of the fresh air fan to decrease, determine whether to stop or continue to work the fresh air fan according to the relationship between the indoor carbon dioxide concentration and the first preset concentration. After the fresh air fan is determined to continue to work, determine whether to reduce or maintain the rotation speed of the fresh air fan according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before. After determining that the rotation speed of the fresh air fan remains unchanged, judge whether the temperature difference of the indoor temperature in the second time period reaches the first preset temperature.

[0162] The second time period can be 15 minutes. Among them, the eighth rotation speed can be less than the second rotation speed and less than the first rotation speed. The eighth rotation speed can be a low rotation speed gear, and the thirteenth rotation speed is higher than the eighth rotation speed. The thirteenth rotation speed can be a medium rotation speed gear. The first preset temperature can be 2 °C. Specifically, the temperature compensation is to increase the heating capacity or cooling capacity according to the demand.

[0163] When the user type is not the second type, the user is a fourth type of user. The fourth type of user is a temperature-sensitive user who needs temperature compensation when the temperature difference is large. In addition to considering the carbon dioxide concentration and noise, this application also considers the change of indoor temperature, adapts to the needs of temperature-sensitive customers, increases the applicable range of users, and meets the needs of more users.

[0164] Specifically, referring to Figure 5 , step S610 includes:

[0165] S611: The fresh air fan operates at the eighth rotation speed;

[0166] S612: Judge whether the temperature difference of the indoor temperature in the second time period reaches the first preset temperature. When the temperature difference of the indoor temperature in the second time period reaches the first preset temperature, execute S613: When the temperature difference of the indoor temperature in the second time period does not reach the first preset temperature, execute S614;

[0167] S613: Turn on the air conditioner for cooling or heating for temperature compensation, or adjust the operating parameters during air conditioner cooling or heating for temperature compensation; then execute S612;

[0168] S614: Determine the relationship between the indoor carbon dioxide concentration and the second preset concentration and the third preset concentration. When the indoor carbon dioxide concentration reaches the second preset concentration, the fresh air fan speed remains unchanged, and then execute S612; when the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at the thirteenth speed, and then execute S615;

[0169] S615: Determine whether the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before. When the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before, the fresh air fan speed remains, and then execute S612; when the current indoor carbon dioxide concentration does not reach the carbon dioxide concentration at the first time before, the fresh air fan speed is reduced by the third fixed speed, and then execute the next step;

[0170] S616: Determine whether the indoor carbon dioxide concentration reaches the first preset concentration. When the indoor carbon dioxide concentration reaches the first preset concentration, execute S615. When the indoor carbon dioxide concentration does not reach the first preset concentration, end.

[0171] Execute S612, S614, and S616 at regular intervals. Among them, S612, S614, and S616 can be executed once every 15 minutes or 10 minutes.

[0172] In some embodiments of the present application, the controller is configured to: when the indoor carbon dioxide concentration reaches the second preset concentration and the air conditioner is not operating within the first preset time period, the fresh air fan operates at the ninth speed, and then determine the relationship between the indoor carbon dioxide concentration and the second preset concentration and the third preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan maintains the ninth speed. When the indoor carbon dioxide concentration reaches the second preset concentration and does not reach the third preset concentration, the fresh air fan operates at the tenth speed and the tenth speed is greater than the ninth speed. When the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at the eleventh speed and the eleventh speed is greater than the tenth speed. The present application considers carbon dioxide and the operating time of the air conditioner, ensuring an efficient operation mode at different times and improving the user experience.

[0173] The controller is configured to: after the fresh air fan maintains the ninth speed, continue to monitor the indoor carbon dioxide concentration, and determine whether the fresh air fan speed remains at the ninth speed or increases to the tenth speed or increases to the eleventh speed according to the relationship between the indoor carbon dioxide concentration and the second preset concentration and the third preset concentration.

[0174] Among them, the ninth rotational speed can be equal to the second rotational speed, the tenth rotational speed can be equal to the third rotational speed, the eleventh rotational speed can be equal to the fourth rotational speed, the ninth rotational speed can be a medium rotational speed gear, the tenth rotational speed can be a high rotational speed gear, and the eleventh rotational speed can be a strong rotational speed gear.

[0175] Specifically, referring to Figure 6 , when the indoor carbon dioxide concentration reaches the second preset concentration and the air conditioner is not operating within the first preset time period, step S710 is executed.

[0176] Step S710 includes:

[0177] S711: The fresh air fan operates at the ninth rotational speed;

[0178] S712: Determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, execute S711; when the indoor carbon dioxide concentration reaches the second preset concentration, execute S713;

[0179] S713: Determine whether the indoor carbon dioxide concentration reaches the third preset concentration. When the indoor carbon dioxide concentration does not reach the third preset concentration, execute S714; when the indoor carbon dioxide concentration reaches the third preset concentration, execute S715;

[0180] S714: The fresh air fan operates at the tenth rotational speed and the tenth rotational speed is greater than the ninth rotational speed, and then execute S712.

[0181] S715; The fresh air fan operates at the eleventh rotational speed and the eleventh rotational speed is greater than the tenth rotational speed, and then execute S713.

[0182] Every certain period of time, execute S712 and S713. Among them, S712 and S713 can be executed once every 15 minutes.

[0183] In some embodiments of the present application, the user type of the air conditioner is determined according to the user-acceptable carbon dioxide concentration range, noise range, area of the room where the air conditioner is installed, the expected number of users of the air conditioner, and the degree of the user-acceptable indoor temperature range.

[0184] The air conditioner may also include that the user controls the air conditioner through a smart device or a control device. Among them, the control device can be a remote control. The communication between the remote control and the air conditioner includes infrared protocol communication or Bluetooth protocol communication, as well as other short-distance communication methods, and controls the air conditioner in a wireless or wired manner. The user can input user instructions through the buttons on the remote control, voice input, or control panel input to control the air conditioner. It is also possible to use a smart device (such as a mobile terminal, tablet computer, computer, laptop, etc.) to control the air conditioner. For example, use an application program running on the smart device to control the air conditioner. Among them, the user can input or select the acceptable carbon dioxide concentration range, noise range, area of the room where the air conditioner is installed, expected number of people using the air conditioner, and the acceptable indoor temperature range through the smart device or the control device.

[0185] The controller can receive instructions without using the above-mentioned smart device or control device, but receive the user's control through touch or gestures, etc.

[0186] The air conditioner can also be controlled in a way other than the control device and the smart device. For example, it can directly receive the user's voice instructions through the module for obtaining voice instructions configured inside the air conditioner device, or receive the user's voice instructions through the voice control device set outside the air conditioner device. The user can input or select the acceptable carbon dioxide concentration range, noise range, area of the room where the air conditioner is installed, expected number of people using the air conditioner, and the acceptable indoor temperature range through the module for obtaining voice instructions configured inside the air conditioner device or the voice control device set outside the air conditioner device.

[0187] In some embodiments of the present application, after determining the user of the first type, second type, or third type, a temperature difference detection program can be set to detect the indoor temperature. When the temperature difference is large within a certain period of time, temperature compensation is performed, and the way of temperature compensation is the same as that in the fourth type of users. Among the first type, second type, and third type, the reference value of the temperature difference for whether to perform temperature compensation is larger than that in the fourth type.

[0188] In some embodiments of the present application, refer to Figures 7 - 22 , an air inlet panel 15 is provided at the top of the casing 1. Among them, the heat exchange air inlet 11 is provided on the air inlet panel 15. An air inlet grille can be provided at the heat exchange air inlet, and an air inlet filter can be provided inside the air inlet grille.

[0189] The casing 1 includes a front panel 14. Among them, the front panel 11 is provided on the side of the casing 1, and the heat exchange air outlet 12 is located below the front panel 14.

[0190] The front panel 14 is provided with a first air outlet 141; wherein, the first air outlet 141 is provided above the heat exchange air outlet.

[0191] The casing 1 further includes two side end plates 19, and the two side end plates 19 are provided on the two opposite sides of the casing 1 and on both sides of the front panel.

[0192] A first air duct 16 is provided inside the casing 1; wherein, the first air duct 16 is communicated with the heat exchange air duct, and the first air duct 16 is located inside the front panel, and the first air duct 16 is communicated with the first air outlet.

[0193] Wherein, indoor air enters the heat exchange air duct through the heat exchange air inlet, and the indoor air can enter the first air duct from the heat exchange air duct, and the air entering the first air duct flows out from the first air outlet.

[0194] The casing 1 further includes a guide vane 33, and the guide vane 33 is rotatably connected at the heat exchange air outlet to open or close the heat exchange air outlet.

[0195] When the guide vane 33 closes the heat exchange air outlet, the air in the heat exchange air duct will enter the first air duct and then flow out from the first air outlet.

[0196] The casing 1 further includes a first air duct inner wall 161; wherein, the first air duct inner wall 161 is provided on the side of the first air duct away from the front panel.

[0197] The heat exchange air duct 13 has a heat exchange air duct side wall 131.

[0198] Reference Figures 7 - 22 , the casing 1 further includes a front volute tongue 1311, and the heat exchange air duct side wall 131 includes the front volute tongue 1311, that is, the front volute tongue is a component of the heat exchange air duct side wall, and the front volute tongue 1311 is provided on the side of the indoor fan close to the front panel.

[0199] The heat exchange air duct side wall 131 further includes a rear volute tongue 1312; wherein, the rear volute tongue is provided on the opposite side of the front volute tongue, and the front volute tongue and the rear volute tongue form a fan space therebetween, and the indoor fan is located in the fan space.

[0200] The casing 1 further includes a deflector 17; wherein, the deflector 17 is provided at the connection of the heat exchange air duct and the first air duct, and is located on the side of the connection of the heat exchange air duct and the first air duct away from the front panel.

[0201] One end of the deflector 17 is connected to the first air duct inner wall and is located inside the first air duct; the other end of the deflector 17 is connected to the front volute tongue.

[0202] The side surface of the deflector 17 close to the front panel is an arc surface, and the arc contour of the arc surface extends from the end connected to the first air duct inner wall to the end connected to the front volute tongue, and the radius of the arc contour is any value between 50 - 80 mm.

[0203] The sides of the first air duct and the deflector plate close to the front panel are set as arc surfaces, which can utilize the guiding effect of the deflector plate to reduce the resistance at the connection of the heat exchange air duct and the first air duct, and increase the air volume of the air entering the first air duct from the heat exchange air duct. The radius of the arc contour is set to any value in the range of 50 - 80 mm, so as to increase the guiding effect of the deflector plate without affecting other structures of the air conditioner indoor unit.

[0204] The housing 1 is provided with a ventilation opening 18 that communicates the heat exchange air duct 13 and the first air duct 16. Among them, the ventilation opening 18 is strip-shaped.

[0205] The air conditioner indoor unit 10 further includes a damper 34. The damper 34 is connected to the ventilation opening 18 to open or close the ventilation opening. By setting the damper, the ventilation opening can be opened or closed, and it can be selected whether the first air outlet blows air, which can provide multiple choices for users and improve the user experience.

[0206] Among them, the damper is rotatably connected to the ventilation opening 18 to open or close the ventilation opening. Among them, the damper is rotatably connected to the housing 1.

[0207] Among them, when the damper closes the ventilation opening and the deflector plate opens the heat exchange air outlet, the heat exchange air outlet blows air. When the deflector plate closes the heat exchange air outlet and the damper opens the ventilation opening, the first air outlet blows air. By setting the form and / or the air outlet direction of the first air outlet, it is possible to avoid direct air blowing on people during cooling, and prevent cold air at the initial stage of heating.

[0208] Through simulation, it can be known that when the deflector plate closes the heat exchange air outlet and the damper opens the ventilation opening, compared with the sharp corner setting at the connection of the traditional heat exchange air duct and the first air duct, by setting the deflector plate and the radius of the arc contour to any value in the range of 50 - 80 mm, the wind speed entering the first air duct can be increased by about 60%.

[0209] The damper includes a rotating column 341 and a door body 342. Among them, the rotating column 341 is rotatably connected to the housing, the rotating column is arranged on the side of the communication port close to the front panel, and the door body is connected to the rotating column and rotates with the rotating column.

[0210] The air conditioner indoor unit further includes a damper motor (not shown). The damper motor is connected to one end of the rotating column. When the damper motor works, it drives the rotating column to rotate, driving the door body to rotate, so that the damper opens or closes the communication port.

[0211] The front panel 14 includes a first panel section 143 and a second panel section 144. Among them, the second panel section is connected to the bottom of the first panel section, the first panel section and the second panel section are arranged at an angle, and the opening of the angle faces the inside of the front panel.

[0212] Among them, the first air outlet is arranged on the second panel section, making the front panel look beautiful and facilitating the setting of the air outlet direction of the first air outlet. Specifically, the second panel section can be inclined, so that the first air outlet can be arranged towards the top of the casing, horizontally, or towards the bottom of the casing; the first panel section 143 can be located in the middle or at the bottom of the front panel.

[0213] The front panel 14 further includes a third panel section 145, and the third panel section 145 is connected to one end of the second panel section away from the first panel section. Among them, the end of the second panel section away from the first panel section is the bottom end of the second panel section. The third panel section and the second panel section are arranged at an angle, and the opening of the angle faces the inner side of the front panel.

[0214] The air damper is rotatably connected to one end of the third panel section away from the second panel section. Specifically, the rotating column is rotatably connected to one end of the third panel section away from the second panel section. The air damper is rotatably connected at the ventilation opening and the air damper includes a rotating column and a door body, with a simple structure and convenient setting.

[0215] The side wall of the rotating column is a cylindrical surface 3411, and the side end surface of one end of the third panel section away from the second panel section is an arc surface 1451. The side wall of the rotating column abuts against the side end surface of one end of the third panel section away from the second panel section, so that during the rotation of the rotating column, the side wall of the rotating column always abuts against the side end surface of one end of the third panel section away from the second panel section, which can avoid the generation of a gap between the rotating column and the third panel section, prevent air from flowing between the heat exchange air duct and the first air duct here, and avoid the reduction of the air volume of the heat exchange air outlet or the first air outlet caused by the gap generated here.

[0216] Among them, the end face radius of the cylindrical surface of the rotating column can be equal to the arc radius of the arc surface at the end of the third panel section, which can increase the abutting area between the cylindrical surface and the arc surface and better improve the sealing effect here.

[0217] The end of the third panel section away from the second panel section is the side wall on the side of the ventilation opening close to the front panel.

[0218] The end of the front volute tongue 1311 close to the heat exchange air outlet has a connecting surface 13111 located below the guide plate. When the air damper closes the ventilation opening, the air damper is connected to the connecting surface. Specifically, the end of the door body away from the rotating column is connected to the connecting surface, which is convenient for the air damper to be connected to the front volute tongue to close the ventilation opening. Among them, the connecting surface is the side wall surface of the ventilation opening away from the side wall of the front panel.

[0219] The front volute tongue includes a first front volute tongue 13112 on its side close to the heat exchange air outlet, and a second front volute tongue 13113 connected to one end of the first front volute tongue away from the heat exchange air outlet. The second front volute tongue is located above the first front volute tongue and is arranged at an angle with the first front volute tongue. The deflector is connected to the first front volute tongue. Specifically, the connecting surface is provided at the end of the first front volute tongue close to the heat exchange air outlet and is located below the deflector.

[0220] The deflector is located above the first front volute tongue. The first front volute tongue has a volute front face at its end close to the heat exchange air outlet. The air damper has a first end 343 of the air damper, and the first end of the air damper is the end away from the front panel. When the air damper closes the ventilation opening, the first end of the air damper is connected to the volute front face 13114. The bottom of the first end of the air damper is located above the bottom of the volute front face or is flush with the bottom of the volute front face, so as to avoid forming a flow resistance to the air in the heat exchange air duct when the bottom of the first end of the air damper is lower than the volute front face. The volute front face is the side wall surface of the ventilation opening away from the side wall of the front panel.

[0221] When the air damper opens the ventilation opening, the air damper has a third position. When the air damper is in the third position, the air deflector closes the heat exchange air outlet and the end of the air damper abuts against the inner wall surface of the air deflector. Specifically, the first end of the air damper abuts against the inner wall surface of the air deflector, so that the air damper can open the ventilation opening to the maximum extent, which is beneficial to the air flow in the heat exchange air duct to flow into the first air duct.

[0222] In some embodiments of the present application, the fresh air module further includes a fresh air housing. Among them, the fresh air housing is arranged in the housing 1, a fresh air fan cavity is arranged in the fresh air housing, the fresh air fan is arranged in the fresh air fan cavity, and the fresh air fan cavity is communicated with the outside.

[0223] A fresh air discharge port 1611 is arranged on the inner wall of the first air duct. The fresh air fan cavity and the first air duct are communicated through the fresh air discharge port 1611, so that fresh air can be introduced into the first air duct, realizing the separate air outlet or mixed air outlet of fresh air. When mixing fresh air, the temperature difference between fresh air and indoor air can be reduced, improving the user experience of fresh air.

[0224] A fresh air inlet is arranged on the fresh air housing, and the fresh air inlet communicates the fresh air fan cavity with the outside.

[0225] Driven by the fresh air fan, outdoor air enters the fresh air fan cavity through the fresh air inlet, then enters the first air duct through the fresh air discharge port, and then the fresh air flows out from the first air outlet.

[0226] When the air damper closes the ventilation opening, the fresh air fan drives fresh air to flow out from the first fresh air outlet, and the indoor fan drives indoor air to flow out from the heat exchange air outlet.

[0227] When the air damper opens the ventilation opening and the air deflector closes the heat exchange air outlet, the fresh air fan drives fresh air into the first air duct, and the indoor fan drives indoor air into the first air duct through the heat exchange air duct. The fresh air and the indoor air are mixed in the first air duct, and the mixed air flows out from the first air outlet.

[0228] In some embodiments of the present application, referring to Figures 7 - 22 , a first air outlet grille 142 is provided at the first air outlet, so that the air outlet at the first air outlet is soft, which can avoid direct blowing of air on people during cooling and can prevent cold air at the initial stage of heating.

[0229] The first air outlet grille 142 includes first air outlet grille bars 1421. There are several first air outlet grille bars 1421 and they are not vertically arranged. First grille air ducts 1422 are provided on both sides of the first air outlet grille bars. Among them, the first grille air duct can be arranged towards the outside of the front panel and towards the bottom of the cabinet, or the first grille air duct is arranged towards the outside of the front panel and horizontally, or the first grille air duct is arranged towards the outside of the front panel and towards the top of the cabinet.

[0230] The cross-sectional profile of the first air outlet grille bar 1421 can be diamond-shaped.

[0231] In some embodiments of the present application, the first air outlet grille bar includes a first arc surface 14211 provided at its top and a second arc surface 14212 provided at its bottom. The top end of the first arc surface is connected to the top end of the second arc surface, and the bottom end of the first arc surface and the bottom end of the second arc surface are connected. The openings of the first arc surface 14211 and the second arc surface 14212 are arranged oppositely.

[0232] Setting the first air outlet grille bar to include a first arc surface provided at its top and a second arc surface provided at its bottom makes the side wall of the air outlet grille smooth, reduces the air outlet resistance, and at the same time uses the Coanda effect to better guide the air flow at the top of the cabinet, so that the air flows along the indoor top wall 61, avoids the rapid descent of the air, avoids direct blowing of cold air on people, and setting the first grille air duct towards the outside of the front panel and towards the top of the cabinet can increase the air output of the first air outlet, and the air output can be increased by about 10%.

[0233] In some embodiments of the present application, referring to Figures 7 - 22 , a side air outlet 191 communicating with the first air duct is provided on the side end plate 19. The side air outlet faces the outside of the side end and towards the front panel side, and the side air outlet communicates with the first air duct 16.

[0234] There is a side air outlet grille 192 at the side air outlet 191. The side air outlet grille includes a plurality of side air outlet grille bars 1921. Moreover, the side air outlet grille bars 1921 are not horizontally arranged, and a side grille air duct 1922 is formed between adjacent two side air outlet grille bars; the side grille air duct 1922 faces the outside of the side end plate and is arranged towards the front panel side. Setting the side air outlet can enable the two side airflows to flow along the inner side wall 62 of the room, can realize the surrounding airflow, and while the two side airflows flow along the wall, they gradually sink, which can make the indoor air flow better and improve the user experience.

[0235] The side air outlet grille bar includes a first side surface 19211 on its side close to the front panel and a second side surface 19212 on the side far from the front panel. The first side surface and the second side surface can be flat surfaces.

[0236] In some embodiments of the present application, the first side surface and / or the second side surface is an arc surface. The two ends of the first side surface are respectively connected to the two ends of the second side surface. Setting the first side surface and / or the second side surface as an arc surface can reduce the air outlet resistance, better guide the flow of the air current, and make the side air outlet flow better along the wall.

[0237] When the first side surface is an arc surface, the opening of the first side surface faces the second side surface. When the second side surface is an arc surface, the opening of the second side surface faces the first side surface.

[0238] In some embodiments of the present application, a side air cavity can be provided inside the side end plate 19, and the side air cavity is communicated with the heat exchange air duct or the first air duct.

[0239] In some embodiments of the present application, refer to Figure 17 , a first connecting member (not shown) is provided on the inner wall surface of the air deflector, a second connecting member (not shown) on the side far from the front panel of the ventilation opening, and a third connecting member (not shown) at the end of the door body far from the rotating column.

[0240] Among them, a first connecting position 51 is provided on the inner wall surface of the air deflector, a second connecting position 52 is provided on the side far from the front panel of the ventilation opening, and a third connecting position 53 is provided at the end of the door body far from the rotating column, respectively enabling the first connecting member, the second connecting member, and the third connecting member to be fixed.

[0241] The air door has a first position and a second position. When the air door is in the first position, the air door closes the ventilation opening and the third connecting member is connected to the second connecting member. When the air door is in the second position, the air deflector closes the heat exchange air outlet, the air door opens the ventilation opening and the third connecting member is connected to the first connecting member.

[0242] The first connecting member, the second connecting member and the third connecting member are provided such that when the air damper closes the ventilation opening, the third connecting member is connected to the second connecting member, which can avoid the influence of the wind and gravity in the air duct on the air damper, avoid generating noise and forming a gap between the air damper and the ventilation opening, ensure the stability of the air damper closing the ventilation opening, and enable the air damper to stably open the ventilation opening when the air deflector closes the heat exchange air outlet, avoid the air damper increasing the resistance of the heat exchange air duct air entering the first air duct, improve the stability of the air damper, enable the first air outlet or the heat exchange air outlet to discharge air stably, and improve the user experience.

[0243] The first connecting member and the second connecting member are iron sheets, and the third connecting member is a magnet, which is easy to implement and saves costs.

[0244] Wherein, the second connecting member is arranged on the front volute tongue, which is convenient for arranging the second connecting member. When the front volute tongue includes a first front volute tongue and a second front volute tongue, the second connecting member is arranged on the first front volute tongue, and the second connecting member is arranged at the end of the first front volute tongue close to the heat exchange air outlet.

[0245] When the first front volute tongue has a connecting surface, the second connecting member is arranged on the connecting surface.

[0246] When the deflector is located above the first front volute tongue and the first front volute tongue has a volute tongue front end face at its end close to the heat exchange air outlet, when the air damper closes the ventilation opening, the end of the door body far from the rotating column is connected to the volute tongue front end face through the third connecting member and the second connecting member, and the bottom of the end of the door body far from the rotating column is located above the bottom of the volute tongue front end face or flush with the bottom of the volute tongue front end face, so as to avoid forming a flow resistance to the air in the heat exchange air duct when the bottom of the door body is lower than the volute tongue front end face.

[0247] In some embodiments of the present application, a sponge is provided on one side of the air damper close to the first air duct to reduce the generation of condensation.

[0248] In some embodiments of the present application, refer to Figures 7 - 22 , the air conditioner indoor unit further includes a water receiving tray 54, the water receiving tray is arranged at the bottom of the indoor heat exchanger, and the water receiving tray 54 is located above the deflector.

[0249] Wherein, the water receiving tray is connected to the front volute tongue, or the water receiving tray is integrally formed with the front volute tongue, and the second front volute tongue is the side plate of the water receiving tray on the side away from the front panel.

[0250] The water receiving tray has a water receiving tray bottom plate 542, and support rib plates 543 are arranged on the water receiving tray bottom plate 542, and the indoor heat exchanger is arranged on the support rib plates.

[0251] There may be two support rib plates, which are respectively a first support rib plate and a second support rib plate. The first support rib plate is arranged on the side of the second support rib plate away from the second front volute tongue, and the indoor heat exchanger is arranged on the first support rib plate.

[0252] Vertically, the top of the first support rib plate is lower than the top of the second support rib plate.

[0253] Notches may be provided on the first support rib plate and the second support rib plate to facilitate the flow of condensed water in the water receiving tray.

[0254] 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 thus should not be construed as a limitation on the present invention.

[0255] 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.

[0256] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0257] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of them should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An air conditioner, characterized in that, Comprising: An outdoor carbon dioxide sensor for detecting the outdoor carbon dioxide concentration; An indoor fan; A fresh air module for introducing outdoor fresh air into the room, the fresh air module including a fresh air fan; An indoor carbon dioxide sensor for detecting the indoor carbon dioxide concentration; A controller configured to: When the indoor carbon dioxide concentration reaches a first preset concentration and the outdoor carbon dioxide concentration is below the indoor carbon dioxide concentration, determine whether the user type of the air conditioner is a third type. When the user type is the third type, the fresh air fan operates at a first speed, and then determines whether to maintain or increase the speed of the fresh air fan according to the indoor carbon dioxide concentration value and determines the amplitude of the increase in the speed of the fresh air fan according to the current operating time point of the air conditioner; when the user type is not the third type, determine whether the indoor carbon dioxide concentration reaches a second preset concentration. When the indoor carbon dioxide concentration reaches the second preset concentration and the air conditioner operates within a first preset time period, determine whether the user type of the air conditioner is a first type. When the user type is the first type, the fresh air fan operates at a second speed, and then increases, decreases or maintains the current speed of the fresh air fan according to the indoor carbon dioxide concentration value; Wherein, the first preset time period is a time period including 24:00 Beijing time; The first preset concentration is less than the second preset concentration; The second speed is lower than the first speed; The first type of air conditioner user is a user with relatively high noise requirements; The third type of air conditioner user is a user with relatively high air quality requirements.

2. The air conditioner according to claim 1, wherein The controller is configured to: when the user type is the first type and the fresh air fan operates at the second speed, determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan maintains the second speed. When the indoor carbon dioxide concentration reaches the second preset concentration, determine whether the indoor carbon dioxide concentration reaches a third preset concentration; when the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at a twelfth speed and the twelfth speed is greater than the second speed; when the indoor carbon dioxide concentration does not reach the third preset concentration, the speed of the fresh air fan remains unchanged or decreases; wherein, the third preset concentration is greater than the second preset concentration.

3. The air conditioner according to claim 2, characterized in that, The controller is configured to: when the indoor carbon dioxide concentration does not reach the third preset concentration, determine whether to reduce the speed of the fresh air fan by a first fixed speed or keep it unchanged according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before it, specifically: determine whether the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before it; when the current indoor carbon dioxide concentration reaches the carbon dioxide concentration at the first time before it, the speed of the fresh air fan remains unchanged; when the current indoor carbon dioxide concentration does not reach the carbon dioxide concentration at the first time before it, the speed of the fresh air fan is reduced by a first fixed speed.

4. The air conditioner according to claim 3, wherein, The controller is configured to: after the fresh air fan speed is reduced by a first fixed speed, determine whether the indoor carbon dioxide concentration reaches a first preset concentration. When the indoor carbon dioxide concentration reaches the first preset concentration, determine whether to reduce the fresh air fan speed by the first fixed speed or keep it unchanged according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before.

5. An air conditioner, characterized in that, Including: An outdoor carbon dioxide sensor for detecting the outdoor carbon dioxide concentration; An indoor fan; A fresh air module for introducing outdoor fresh air into the room, and the fresh air module includes a fresh air fan; An indoor carbon dioxide sensor for detecting the indoor carbon dioxide concentration; A controller configured to: When the indoor carbon dioxide concentration reaches the first preset concentration and the outdoor carbon dioxide concentration is below the indoor carbon dioxide concentration, determine whether the user type of the air conditioner is the third type. When the user type is the third type, the fresh air fan operates at a first speed, and then determine whether to keep or increase the fresh air fan speed according to the indoor carbon dioxide concentration value and determine the increase amplitude of the fresh air fan speed according to the current operation time point of the air conditioner. When the user type is not the third type, determine whether the indoor carbon dioxide concentration reaches a second preset concentration. When the indoor carbon dioxide concentration reaches the second preset concentration and the air conditioner operates within a first preset time period, determine whether the user type of the air conditioner is the first type. When the user type is the first type, determine the fresh air fan speed according to the indoor carbon dioxide concentration and the outdoor carbon dioxide concentration. When the fresh air fan speed reaches the maximum fresh air fan speed acceptable to the first type of user, operate at the maximum fresh air fan speed acceptable to the first type of user. When the fresh air fan speed does not reach the maximum fresh air fan speed acceptable to the first type of user, operate at the determined fresh air fan speed; Wherein, the first preset time period is a time period including 24:00 Beijing time; The first preset concentration is less than the second preset concentration; The first type of air conditioner user is a user with relatively high noise requirements; The third type of air conditioner user is a user with relatively high air quality requirements.

6. The air conditioner according to claim 1 or 5, characterized in that, The controller is configured to: after the fresh air fan operates at the first speed, determine whether the indoor carbon dioxide concentration reaches the second preset concentration. When the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan keeps operating at the first speed. When the indoor carbon dioxide concentration reaches the second preset concentration, determine the increased speed of the fresh air fan according to the current operation time point of the air conditioner, and then the fresh air fan operates at the sum of the first speed and the increased speed.

7. The air conditioner according to claim 6, characterized in that, The controller is configured to: after the indoor carbon dioxide concentration reaches the second preset concentration, determine whether the current operation time point of the air conditioner is within the first preset time period. When the current operation time point of the air conditioner is within the first preset time period, the fresh air fan operates at a third speed. When the current operation time point of the air conditioner is not within the first preset time period, the fresh air fan operates at a fourth speed; wherein, the fourth speed is greater than the third speed, and the third speed is greater than the first speed.

8. The air conditioner according to claim 1 or 5, characterized in that The controller is further configured to: when the user type is not the first type, determine whether the user type is the second type; when the user type is the second type, the fresh air fan operates at the fifth speed, and then determine the indoor carbon dioxide concentration; when the indoor carbon dioxide concentration does not reach the second preset concentration, the fresh air fan maintains the fifth speed; when the indoor carbon dioxide concentration reaches the second preset concentration and does not reach the third preset concentration, the fresh air fan operates at the sixth speed and the sixth speed is greater than the fifth speed; when the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at the seventh speed and the seventh speed is greater than the sixth speed; wherein, the fifth speed is greater than the second speed; the air conditioner user of the second type is a user with a high population density.

9. The air conditioner according to claim 8, characterized in that, The controller is further configured to: after the fresh air fan operates at the seventh speed, continue to monitor the indoor carbon dioxide concentration, determine whether to reduce or maintain the speed of the fresh air fan according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before; after driving the speed of the fresh air fan to decrease, determine whether to stop or continue to operate the fresh air fan according to the relationship between the indoor carbon dioxide concentration and the first preset concentration; after the fresh air fan is determined to continue to operate, determine whether to reduce or maintain the speed of the fresh air fan according to the relationship between the current indoor carbon dioxide concentration and the carbon dioxide concentration at the first time before; after determining that the speed of the fresh air fan is maintained, drive the fresh air fan to operate at the sixth speed or the seventh speed according to the relationship between the indoor carbon dioxide concentration and the third preset concentration.

10. The air conditioner according to claim 8, characterized in that, The air conditioner further includes: an indoor temperature sensor for detecting the indoor temperature; The controller is configured to: when the user type is not the second type, the fresh air fan operates at the eighth speed, and then determine whether the temperature difference of the indoor temperature within the second time period reaches the first preset temperature; when the temperature difference of the indoor temperature within the second time period reaches the first preset temperature, turn on the air conditioner for cooling or heating for temperature compensation, or adjust the operating parameters of the air conditioner for cooling or heating for temperature compensation; when the temperature difference of the indoor temperature within the second time period does not reach the first preset temperature, determine the relationship between the indoor carbon dioxide concentration and the second preset concentration and the third preset concentration, the third preset concentration is greater than the second preset concentration, when the indoor carbon dioxide concentration reaches the second preset concentration, the speed of the fresh air fan remains unchanged, when the indoor carbon dioxide concentration reaches the third preset concentration, the fresh air fan operates at the thirteenth speed, and the thirteenth speed is greater than the eighth speed; the eighth speed is less than the second speed and less than the first speed.

Images