Air conditioner indoor unit

Abstract

The application relates to an air conditioner indoor unit, which comprises a casing, an indoor heat exchanger, a heat exchange fan, a steam generating device, and a controller. The steam generating device comprises an electric heating element for heating liquid to generate steam. The controller is configured to: when the indoor temperature is within a first preset range, start the steam generating device, and the electric heating element operates at a first power to generate steam to warm and humidify the indoor air; when the indoor temperature is lower than the lower limit value of the first preset range, the indoor heat exchanger is used as a condenser to operate for a first preset time, the rotating speed of the heat exchange fan is increased, the steam generating device is started, and the electric heating element operates at a second power to generate steam to warm and humidify the indoor air, the second power being greater than the first power; when the indoor temperature is higher than the upper limit value of the first preset range, the indoor heat exchanger stops operating; and when the indoor formaldehyde concentration is higher than a first preset concentration, an outdoor air inlet is started to introduce fresh air into the room to improve the formaldehyde release, de-aldehyde effect and energy saving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner indoor unit. BACKGROUND

[0002] At present, with the improvement of people's living quality and level, health is becoming more and more important in the family scene. For the home appliance market, more and more home appliances are developing around the theme of "health". Formaldehyde, the No. 1 killer affecting the health of the family scene, more and more users begin to look for reliable and effective ways to remove formaldehyde. As a class 1 carcinogen, formaldehyde exists in two forms in the room: combined formaldehyde in furniture boards and free formaldehyde in indoor air. The combined formaldehyde in furniture boards will gradually release to the air at room temperature, continuously increasing the content of free formaldehyde in the air and intensifying the threat to human health. There is no mature technology that can completely remove formaldehyde contained in furniture boards in a short time.

[0003] The air conditioner usually includes an air conditioner indoor unit and an air conditioner outdoor unit, and some air conditioner indoor units include an indoor heat exchanger, a heat exchange fan and a steam generating device. The indoor heat exchanger is arranged inside the casing. The heat exchange fan is arranged inside the casing, and the indoor air is introduced into the casing through the heat exchange fan, and the heat exchange air flow is formed by the heat exchange of the indoor heat exchanger, and the heat exchange air flow is output to the indoor under the driving of the heat exchange fan. The steam generating device is arranged inside the casing and is in communication with the indoor air inlet and / or the outdoor air inlet. The steam generating device includes an electric heating element for heating a liquid to generate steam and release it outside the casing.

[0004] The high-temperature steam generated by the steam generating device can cause the bacteria and virus cells in the air flow to lose metabolic activity and die due to high temperature. On the other hand, when the dust, lint and dust mites in the air come into contact with the high-humidity air, the water vapor in the air will cause them to settle, further filtering the air, so that the purified air flow is released outside the casing, thereby achieving the air purification effect.

[0005] However, the current way of removing formaldehyde through the air conditioner indoor unit cannot distinguish different indoor temperatures and whether there is a person in the room. It is not disclosed that the high-temperature steam generated by the steam generating device is used in combination with the indoor heat exchanger to remove formaldehyde. At the same time, the existing air conditioner indoor unit removes formaldehyde by using an aldehyde removal filter, which has low formaldehyde removal efficiency. SUMMARY

[0006] The present application at least partially solves one of the problems in the related art.

[0007] To this end, the application aims to provide an air conditioner indoor unit which can selectively implement formaldehyde removal logic at different indoor temperatures, thereby ensuring that the formaldehyde removal effect reaches the best and energy-saving effect.

[0008] To achieve the above-mentioned purpose, the application provides an air conditioner indoor unit, comprising:

[0009] A cabinet, wherein an indoor air inlet and an outdoor air inlet are arranged on the cabinet;

[0010] An indoor heat exchanger arranged inside the cabinet;

[0011] A heat exchange fan arranged inside the cabinet, which introduces indoor air from the heat exchange air inlet into the cabinet interior through the operation of the heat exchange fan, and forms a heat exchange air flow through the indoor heat exchanger, which is output to the indoor under the driving of the operation of the heat exchange fan;

[0012] A steam generating device arranged in the cabinet and communicated with the indoor air inlet and / or the outdoor air inlet, wherein the steam generating device comprises an electric heating element for heating a liquid to generate steam and release the steam to the outside of the cabinet;

[0013] The controller is configured to: when the indoor temperature is within a first preset range, start the steam generating device, and the electric heating element operates at a first power to generate steam to warm and humidify the indoor air;

[0014] When the indoor temperature is lower than the lower limit value of the first preset range, the indoor heat exchanger is used as a condenser to operate for a first preset time, the rotating speed of the heat exchange fan is increased, the steam generating device is started, and the electric heating element operates at a second power to generate steam to warm and humidify the indoor air, wherein the second power is greater than the first power;

[0015] When the indoor temperature is higher than the upper limit value of the first preset range, the indoor heat exchanger stops operating;

[0016] When the indoor formaldehyde concentration is higher than a first preset concentration, the outdoor air inlet is opened to introduce fresh air into the indoor.

[0017] In the technical scheme, after the air conditioner indoor unit is started in the formaldehyde removal mode, the formaldehyde removal logic can be selectively implemented at different indoor temperatures, thereby ensuring that the formaldehyde removal effect reaches the best and energy-saving effect.

[0018] In some embodiments of the application, the first preset range includes a first range and a second range, and the lower limit value of the first range is higher than the upper limit value of the second range.

[0019] When the indoor temperature is in the second range, the indoor heat exchanger functions as a condenser to operate for a second preset time, the heat exchange fan rotates at a higher speed, the steam generating device is turned on, and the electric heating element operates at a first power to generate steam to warm and humidify the indoor air.

[0020] In some embodiments of the present application, when the indoor temperature is higher than the upper limit of the first preset range, it is detected whether the indoor humidity is higher than a first preset humidity;

[0021] When the indoor humidity is higher than the first preset humidity, the steam generating device stops operating.

[0022] In some embodiments of the present application, when the indoor humidity is higher than the first preset humidity, it is detected whether the indoor formaldehyde concentration is higher than a first preset concentration;

[0023] When the indoor formaldehyde concentration is higher than the first preset concentration, the outdoor air inlet is opened to introduce fresh air into the room.

[0024] In some embodiments of the present application, when the indoor temperature is higher than the upper limit of the first preset range and the indoor humidity is not higher than the first preset humidity, the steam generating device is turned on, and the electric heating element operates at a first power to generate steam to warm and humidify the indoor air.

[0025] In some embodiments of the present application, when the indoor formaldehyde concentration is higher than the first preset concentration, the outdoor air inlet is opened to introduce fresh air into the room;

[0026] When the indoor formaldehyde concentration is lower than a second preset concentration, the outdoor air inlet is closed, and the indoor air inlet is opened.

[0027] In another aspect, the present application also provides an air conditioner indoor unit, comprising:

[0028] A housing, wherein an indoor air inlet and an outdoor air inlet are arranged on the housing;

[0029] An indoor heat exchanger arranged inside the housing;

[0030] A heat exchange fan arranged inside the housing, wherein the indoor air is introduced into the housing through the heat exchange fan, and the indoor air is exchanged by the indoor heat exchanger to form a heat exchange airflow, and the heat exchange airflow is output to the room under the driving of the heat exchange fan;

[0031] A steam generating device arranged in the housing and in communication with the indoor air inlet and / or the outdoor air inlet, wherein the steam generating device comprises an electric heating element for heating a liquid to generate steam and release the steam outside the housing;

[0032] a human sensor for detecting whether there is a human in the room;

[0033] The controller is configured to:

[0034] when detecting that there is a human in the room, starting the steam generating device, and the electric heating element operating at a second power to generate steam to warm and humidify the indoor air;

[0035] after the electric heating element operating at the second power for a third preset time, stopping the steam generating device, and starting the outdoor air inlet to introduce fresh air into the room.

[0036] In some embodiments of the present application, when detecting that there is a human in the room, after the outdoor air inlet is opened for a fourth preset time, the outdoor air inlet is closed, the indoor air inlet is opened, and the electric heating element operates at the second power to generate steam to warm and humidify the indoor air.

[0037] In some embodiments of the present application, when detecting that there is no human in the room, the indoor heat exchanger stops operating, the heat exchanger fan starts operating at a first speed for a first time, and the indoor formaldehyde concentration is detected.

[0038] when detecting that the indoor formaldehyde concentration is higher than a set range of the initial indoor formaldehyde concentration, the speed of the heat exchanger fan is increased.

[0039] In some embodiments of the present application, when detecting that there is no human in the room, the indoor heat exchanger stops operating, the heat exchanger fan starts operating at a first speed for a first time, and the indoor formaldehyde concentration is detected.

[0040] when detecting that the indoor formaldehyde concentration is not higher than a set range of the initial indoor formaldehyde concentration, the heat exchanger fan operates at the first speed.

[0041] Additional aspects and advantages of the present application will be given, partially in the following description, partially will become obvious from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a schematic view of a shell structure of an air conditioner indoor unit according to an embodiment of the present application;

[0043] Figure 2 is a schematic view of a position of an indoor air inlet of an air conditioner indoor unit according to an embodiment of the present application;

[0044] Figure 3 is Figure 2 is a sectional view in A-A direction in FIG.

[0045] Figure 4is a side view of a casing of an air conditioner indoor unit according to an embodiment of the present application;

[0046] Figure 5 is a sectional view of B-B direction in FIG. B;

[0047] Figure 6 is a schematic view of an installation position of a water storage tank of an air conditioner indoor unit according to an embodiment of the present application;

[0048] Figure 7 is a schematic view of an installation position of a steam generating device of an air conditioner indoor unit according to an embodiment of the present application;

[0049] Figure 8 is a schematic view of an installation position of an electric heating element of an air conditioner indoor unit according to an embodiment of the present application;

[0050] Figure 9 is a schematic view of a position of an electric heating element and a water storage tank of an air conditioner indoor unit according to an embodiment of the present application;

[0051] Figure 10 is a flow of removing formaldehyde when there is no one in a room of an air conditioner indoor unit according to an embodiment of the present application Figure 1 ;

[0052] Figure 11 is a flow of removing formaldehyde when there is no one in a room of an air conditioner indoor unit according to an embodiment of the present application Figure 2 ;

[0053] Figure 12 is a flow of removing formaldehyde when there is no one in a room of an air conditioner indoor unit according to an embodiment of the present application Figure 3 ;

[0054] Figure 13 is a flow of removing formaldehyde when there is no one in a room of an air conditioner indoor unit according to an embodiment of the present application Figure 4 ;

[0055] Figure 14 is a flow of removing formaldehyde when there is no one in a room of an air conditioner indoor unit according to an embodiment of the present application Figure 5 ;

[0056] Figure 15 is a flow of removing formaldehyde when there is no one in a room of an air conditioner indoor unit according to an embodiment of the present application Figure 6 ;

[0057] Figure 16 is a flow of removing formaldehyde when there is no one in a room of an air conditioner indoor unit according to an embodiment of the present application Figure 7 ;

[0058] Figure 17 is a flow of removing formaldehyde when there is no one in a room of an air conditioner indoor unit according to an embodiment of the present application Figure 8 ;

[0059] Figure 18 is the aldehyde removal flowchart of the air conditioner indoor unit when there is no one in the room according to the embodiment of the application Figure 9 ;

[0060] Figure 19 is the aldehyde removal flowchart of the air conditioner indoor unit when there is no one in the room according to the embodiment of the application Figure 10 ;

[0061] Figure 20 is the aldehyde removal flowchart of the air conditioner indoor unit when there is no one in the room according to the embodiment of the application Figure 10 ;

[0062] Figure 21 is the aldehyde removal flowchart of the air conditioner indoor unit when there is no one in the room according to the embodiment of the application

[0063] In the above figures: the casing 1; the steam generating device 2; the electric heating element 3; the water storage tank 4; the indoor air inlet 5; the outdoor air inlet 6; the baffle 7. DETAILED DESCRIPTION

[0064] The application will now be described in detail by way of example with reference to the drawings. It is to be understood that the elements, structures and features of one embodiment can be beneficially incorporated into other embodiments without further recitation.

[0065] In the present application, the air conditioner includes an air conditioner indoor unit and an air conditioner outdoor unit. When the air conditioner operates in a cooling mode, the air conditioner performs a cooling cycle of the air conditioner indoor unit by using a compressor, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger.

[0066] The cooling cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been adjusted and heat-exchanged, provides cold energy to the indoor space through the heat absorption process of the refrigerant, and achieves temperature adjustment of the indoor space.

[0067] The compressor compresses the refrigerant gas in a low-temperature and low-pressure state to discharge refrigerant gas in a high-temperature and high-pressure state, and the discharged refrigerant gas flows into the outdoor heat exchanger (condenser). The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0068] The expansion valve expands the high-temperature and high-pressure state liquid phase refrigerant condensed in the outdoor heat exchanger into a low-pressure liquid phase refrigerant.

[0069] The indoor heat exchanger evaporates the refrigerant expanded in the expansion valve, and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The indoor heat exchanger can achieve a refrigeration effect by heat exchanging with indoor air using the latent heat of evaporation of the refrigerant.

[0070] Throughout the entire cooling cycle, the indoor unit of the air conditioner can regulate the temperature of the indoor space.

[0071] When the air conditioner is running in heating mode, it uses the compressor, outdoor heat exchanger, expansion valve, and indoor heat exchanger to perform the heating cycle of the indoor unit.

[0072] The heating cycle involves a series of processes, including compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air. The refrigerant releases heat to the indoor space, thereby regulating the temperature of the indoor space.

[0073] The compressor compresses the refrigerant gas at low temperature and low pressure, discharging it as refrigerant gas at high temperature and high pressure. The discharged refrigerant gas flows into the indoor heat exchanger. The indoor heat exchanger condenses the compressed refrigerant into a liquid phase, and the heat generated by condensation exchanges heat with the indoor air flowing through the heat exchanger, thereby increasing the indoor temperature.

[0074] The expansion valve causes the high-temperature, high-pressure liquid refrigerant that condenses in the outdoor heat exchanger to expand into a low-pressure liquid refrigerant.

[0075] The outdoor heat exchanger evaporates the refrigerant that expands in the expansion valve, and returns the refrigerant gas, which is in a low-temperature, low-pressure state, to the compressor. The outdoor heat exchanger can exchange heat with the outdoor air by utilizing the latent heat of refrigerant evaporation.

[0076] Throughout the heating cycle, the indoor unit of the air conditioner can regulate the temperature of the indoor space.

[0077] An air conditioner outdoor unit includes at least a compressor and an outdoor heat exchanger, and an air conditioner indoor unit includes at least an indoor heat exchanger. An expansion valve may be provided in either the air conditioner indoor unit or the air conditioner outdoor unit.

[0078] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the indoor unit of the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an indoor heat exchanger, the indoor unit of the air conditioner functions as a cooler in cooling mode.

[0079] As attached Figures 1-9 As shown, in one embodiment of the air conditioner indoor unit of the present invention, the air conditioner includes an indoor unit and an outdoor unit. The outdoor unit includes a compressor and an outdoor heat exchanger, and the indoor unit includes an indoor heat exchanger. An expansion valve may be located in either the indoor or outdoor unit.

[0080] The air conditioner of this application includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, an expansion valve, and piping for refrigerant flow. Both the indoor and outdoor heat exchangers are connected to the compressor. The expansion valve is an electronic expansion valve, which is connected between the indoor and outdoor heat exchangers and is capable of expanding the liquid refrigerant that has undergone the condensation process into a low-pressure liquid refrigerant.

[0081] The compressor includes an intake port and an exhaust port. The refrigerant, which has absorbed heat and undergone an evaporation process, enters the compressor through the intake port. The compressor compresses the gaseous refrigerant into a high-temperature and high-pressure state and then discharges it through the exhaust port.

[0082] The indoor and outdoor heat exchangers are connected to the compressor via a four-way valve in the refrigerant circuit. The four-way valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port. The compressor's suction port is fixedly connected to the first valve port, and the compressor's discharge port is fixedly connected to the third valve port.

[0083] In the refrigerant circuit, the refrigerant can circulate sequentially through the compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger.

[0084] When the air conditioner is in cooling mode, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port. When the air conditioner is in heating mode, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port.

[0085] In the following, embodiments of this application will be described in detail with reference to the accompanying drawings.

[0086] As attached Figures 1-9 As shown in an illustrative embodiment of the indoor unit of the air conditioner of the present invention, the indoor unit includes: a casing 1, an indoor heat exchanger, a heat exchange fan, a steam generator 2, a temperature sensor, a humidity sensor, and a controller. The casing 1 has an indoor air inlet and an outdoor air inlet; the indoor heat exchanger is disposed inside the casing 1; the heat exchange fan is disposed inside the casing 1, and the operation of the heat exchange fan introduces airflow from outside the casing 1 into the casing 1 through the heat exchange inlet, where it is heat-exchanged by the indoor heat exchanger to form a heat exchange airflow, which is then output to the room under the drive of the heat exchange fan; the heat exchange inlet is disposed on the casing and is connected to the indoor space. The steam generator 2 is disposed inside the casing 1 and is connected to the indoor air inlet and / or the outdoor air inlet.

[0087] The steam generating device 2 includes a water storage tank 4 and an electric heating element 3. The electric heating element is located below the water storage tank 4. The water storage tank 4 stores liquid, and the liquid flows through the electric heating element 3. The electric heating element 3 is used to heat the liquid to generate high-temperature steam and release it to the outside of the casing 1.

[0088] The temperature sensor and the humidity sensor are arranged at the indoor air inlet or the heat exchange air inlet, so as to detect the indoor temperature and the indoor humidity.

[0089] The controller controls the electric heating element in the steam generating device 2 to start operation. Since the steam generating device 2 is communicated with the indoor air inlet and / or the outdoor air inlet, indoor air can be introduced into the steam generating device 2 through the indoor air inlet, or outdoor air can be introduced into the steam generating device 2 through the outdoor air inlet, or indoor air and outdoor air can be introduced into the steam generating device 2 together. The electric heating element 3 in the steam generating device 2 heats the liquid to generate high-temperature steam, which is in contact with the introduced air flow. On the one hand, the bacteria and virus cells in the air flow lose the metabolic activity and die due to the high temperature. On the other hand, when the dust, lint and dust mites in the air come into contact with the high-humidity air, the water vapor in the air can settle and further filter the air, so that the purified air flow is released to the outside of the casing 1, thereby realizing the air purification effect.

[0090] The first fan is further arranged in the casing and is used to drive and guide the air introduced through the indoor air inlet and / or the outdoor air inlet to the indoor space outside the casing. In this way, the high-temperature and high-humidity gas generated by the steam generating device can be driven and guided by the first fan to the indoor space outside the casing.

[0091] With reference to Figures 10-16 When the indoor temperature is within the first preset range, the steam generating device is started, and the electric heating element operates at a first power to generate steam to warm and humidify the indoor air.

[0092] When the indoor temperature is lower than the lower limit value of the first preset range, the indoor heat exchanger is used as a condenser to operate for a first preset time, the rotation speed of the heat exchange fan is increased, the steam generating device is started, and the electric heating element operates at a second power to generate steam to warm and humidify the indoor air. The second power is greater than the first power.

[0093] When the indoor temperature is higher than the upper limit value of the first preset range, the indoor heat exchanger stops operating.

[0094] When the indoor formaldehyde concentration is higher than a first preset concentration, the outdoor air inlet is opened to introduce fresh air into the room.

[0095] Through the above scheme, the air conditioner indoor unit can select to implement the formaldehyde removal logic at different indoor temperatures after starting the formaldehyde removal mode, so as to ensure that the formaldehyde removal effect reaches the best and energy-saving effect.

[0096] The air conditioner indoor unit further comprises a human sensor and a formaldehyde concentration sensor. The human sensor is used to detect whether there is a person in the room, and the formaldehyde concentration sensor is used to detect the indoor formaldehyde concentration.

[0097] When the controller of the air conditioner indoor unit receives the formaldehyde removal command, the infrared human sensor is turned on to detect whether there is a person in the room.

[0098] With reference to Figures 10-20 When the human sensor detects that there is no person in the room, the indoor heat exchanger stops running, and the heat exchanger fan starts running at a first speed to disturb the indoor air, thereby increasing the air flow speed between the indoor air and the surface of the furniture and promoting the release of formaldehyde in the furniture and home decoration into the indoor air.

[0099] After the heat exchanger fan runs at the first speed for a first time, the indoor formaldehyde concentration is detected. When the indoor formaldehyde concentration is detected to be not higher than a set range of the initial indoor formaldehyde concentration, the heat exchanger fan continues to run at the first speed. When the indoor formaldehyde concentration is detected to be higher than the set range of the initial indoor formaldehyde concentration, the speed of the heat exchanger fan is increased to quickly disturb the indoor air.

[0100] In some embodiments, after the controller of the air conditioner indoor unit receives the formaldehyde removal command, the formaldehyde concentration sensor detects the initial indoor formaldehyde concentration at this time, and the set range of the initial indoor formaldehyde concentration can be set as a multiple of the initial indoor formaldehyde concentration. It can be set that the set range of the initial indoor formaldehyde concentration is twice the initial indoor formaldehyde concentration. That is, when the indoor formaldehyde concentration is detected to be twice the initial indoor formaldehyde concentration, it indicates that a large amount of formaldehyde is released from the furniture and home decoration into the indoor air at this time. At this time, the speed of the heat exchanger fan is increased to quickly disturb the indoor air. Specifically, the heat exchanger fan is increased from the first speed to the second speed, and the second speed is higher than the first speed, so as to increase the flow of the indoor air and promote the release of formaldehyde.

[0101] When the heat exchanger fan is increased from the first speed to the second speed, the indoor temperature and the indoor humidity are detected.

[0102] When the indoor temperature is within a first preset range, the steam generating device is turned on, and the electric heating element runs at a first power to generate steam to warm and humidify the indoor air. It can be set that when the difference between the upper limit of the first preset range and the real-time indoor temperature is between 3°C and 10°C, the real-time indoor temperature at this time is within the first preset range.

[0103] When the indoor temperature is lower than the lower limit of the first preset range, the indoor heat exchanger is used as a condenser to run for a first preset time, the speed of the heat exchanger fan is increased, the steam generating device is turned on, and the electric heating element runs at a second power to generate steam to warm and humidify the indoor air.

[0104] The second power is greater than the first power. It can be set that the second power is set as the rated power of the electric heating element, and the first power is set as 80% of the rated power.

[0105] When the indoor temperature is higher than the upper limit value of the first preset range, the formaldehyde in the indoor furniture and home decoration can be promoted to be released into the indoor air quickly. The upper limit value of the first preset range can be set by the user, or preset by the air conditioner factory, or issued by the cloud.

[0106] The first preset range includes a first range and a second range, and the lower limit value of the first range is higher than the upper limit value of the second range.

[0107] When the indoor temperature is in the first range, it means that the indoor temperature is close to the upper limit value of the first preset range, and at this time the steam generating device is started, the electric heating element of the steam generating device operates at a lower first power, and the rotating speed of the first fan is increased. The temperature of the high-temperature and high-humidity steam generated by the steam generating device is higher, and the steam generation amount is larger. The high-temperature and high-humidity steam is discharged to the indoor space outside the casing by the first fan, and when the high-temperature steam warms and humidifies the indoor air, the formaldehyde in the furniture can be released quickly, thereby increasing the release speed of the formaldehyde in the furniture. It can be set that when the difference between the upper limit value of the first preset range and the real-time indoor temperature is between 3°C-5°C, the real-time indoor temperature is in the first range.

[0108] When it is detected that the indoor formaldehyde concentration is higher than the first preset concentration, the outdoor air inlet is opened to introduce fresh air into the indoor.

[0109] The first preset concentration is the concentration when the release of formaldehyde reaches an equilibrium state. It can be set that when the indoor formaldehyde concentration is higher than the first preset concentration, the indoor formaldehyde concentration fluctuates within a preset fluctuation range within a set time, and the preset fluctuation range can be set to 0.001 mg / m 3 .

[0110] In some embodiments, the indoor air inlet and the outdoor air inlet are arranged adjacent to each other, and a baffle is further arranged on the casing, and the baffle is rotatably connected to the casing. The baffle can be rotated to cooperate with the indoor air inlet to close the indoor air inlet, or rotated to cooperate with the outdoor air inlet to close the outdoor air inlet. The baffle can also partially close the indoor air inlet or partially close the outdoor air inlet.

[0111] When it is detected that the indoor formaldehyde concentration is higher than the first preset concentration, it means that the indoor formaldehyde concentration is high at this time. The baffle is rotated to cooperate with the indoor air inlet to close the indoor air inlet, so that the outdoor air inlet is in an open state, and fresh air is introduced into the indoor by opening the outdoor air inlet. The fresh air enters the casing through the outdoor air inlet, is discharged to the indoor space outside the casing after passing through the steam generating device, and the fresh air dilutes the high-concentration formaldehyde in the indoor, and the formaldehyde in the indoor can be discharged to the outdoor through gaps such as door gaps.

[0112] When the indoor temperature is in the second range, the indoor heat exchanger is used as a condenser to operate for a second preset time, which can be set to thirty minutes. The rotation speed of the heat exchange fan is increased, the steam generating device is turned on, and the electric heating element operates at a first power to generate steam to warm and humidify the indoor air. The rotation speed of the first fan is increased, and the steam generating device generates steam with high temperature and high humidity. The high-temperature and high-humidity steam is discharged to the indoor space outside the casing through the first fan, and when the high-temperature steam warms and humidifies the indoor air, the formaldehyde in the furniture can be released quickly, thereby increasing the release speed of formaldehyde in the furniture. It can be set that when the difference between the upper limit of the first preset range and the real-time indoor temperature is between 5°C and 10°C, the real-time indoor temperature is in the second range.

[0113] When it is detected that the indoor formaldehyde concentration is higher than the first preset concentration, the outdoor air inlet is opened to introduce fresh air into the indoor. The fresh air enters the casing through the outdoor air inlet, passes through the steam generating device, and is discharged to the indoor space outside the casing. The fresh air dilutes the high-concentration formaldehyde in the indoor, and the indoor formaldehyde can be discharged to the outdoor through gaps such as door gaps.

[0114] The first preset concentration is the concentration when the release of formaldehyde reaches an equilibrium state. It can be set that when the indoor formaldehyde concentration is higher than the first preset concentration, the indoor formaldehyde concentration fluctuates within a preset fluctuation range within a set time, and the preset fluctuation range can be set to 0.001 mg / m 3 .

[0115] When the indoor temperature is lower than the lower limit of the first preset range, the indoor heat exchanger is used as a condenser to operate for a first preset time, and the length of the first preset time is greater than the length of the second preset time. The first preset time can be set to fifty minutes. The rotation speed of the heat exchange fan is increased, the steam generating device is turned on, and the electric heating element operates at a second power to generate steam to warm and humidify the indoor air. The second power can be set to the rated power. The rotation speed of the first fan is increased, and the steam generating device generates steam with high temperature and high humidity. The high-temperature and high-humidity steam is discharged to the indoor space outside the casing through the first fan, and when the high-temperature steam warms and humidifies the indoor air, the formaldehyde in the furniture can be released quickly, thereby increasing the release speed of formaldehyde in the furniture. It can be set that when the difference between the upper limit of the first preset range and the real-time indoor temperature is greater than 10°C, the real-time indoor temperature is lower than the lower limit of the first preset range.

[0116] When it is detected that the indoor formaldehyde concentration is higher than the first preset concentration, the outdoor air inlet is opened to introduce fresh air into the indoor. The fresh air enters the casing through the outdoor air inlet, passes through the steam generating device, and is discharged to the indoor space outside the casing. The fresh air dilutes the high-concentration formaldehyde in the indoor, and the indoor formaldehyde can be discharged to the outdoor through gaps such as door gaps.

[0117] The first preset concentration is the concentration when the release of formaldehyde reaches an equilibrium state. When the indoor formaldehyde concentration is higher than the first preset concentration, the indoor formaldehyde concentration fluctuates within a preset fluctuation range in a set time. The preset fluctuation range can be set to 0.001 mg / m 3 .

[0118] When the indoor temperature is higher than the upper limit of the first preset range, the indoor heat exchanger stops running, and it is detected whether the indoor humidity is higher than the first preset humidity. When the indoor humidity is higher than the first preset humidity, it indicates that the indoor temperature and the indoor humidity can promote the release of formaldehyde in furniture and home decoration into the indoor air at this time, and there is no need to heat and humidify the indoor air at this time. The steam generating device can be stopped running, that is, the electric heating element is stopped running, thereby saving energy consumption.

[0119] When the indoor temperature is higher than the upper limit of the first preset range, and the indoor humidity is higher than the first preset humidity, the indoor formaldehyde concentration is detected. When the indoor formaldehyde concentration is higher than the first preset concentration, the outdoor air inlet is opened to introduce fresh air into the indoor. At this time, the baffle is rotated to close the indoor air inlet and open the outdoor air inlet. The fresh air enters the cabinet through the outdoor air inlet, is discharged to the indoor space outside the cabinet after the steam generating device, and the fresh air dilutes the high-concentration formaldehyde in the indoor. The formaldehyde in the indoor can be discharged to the outdoor through the gap such as the door joint.

[0120] The first preset concentration is set to the concentration when the release of formaldehyde reaches an equilibrium state. When the indoor formaldehyde concentration is higher than the first preset concentration, the indoor formaldehyde concentration fluctuates within a preset fluctuation range in a set time. The preset fluctuation range can be set to 0.001 mg / m 3 .

[0121] When the indoor temperature is higher than the upper limit of the first preset range, and it is detected that the indoor humidity is not higher than the first preset humidity, the steam generating device is started to run, and the electric heating element is operated at a first power to generate steam to heat and humidify the indoor air. The speed of the first fan is increased, the temperature of the high-temperature and high-humidity steam generated by the steam generating device is higher, and the steam generation amount is larger. The high-temperature and high-humidity steam is discharged to the indoor space outside the cabinet through the first fan, and the high-temperature steam can heat and humidify the indoor air, so that the formaldehyde in the furniture is quickly released, thereby increasing the release speed of the formaldehyde in the furniture.

[0122] When it is detected that the indoor formaldehyde concentration is higher than the first preset concentration, the outdoor air inlet is opened to introduce fresh air into the indoor. The fresh air enters the cabinet through the outdoor air inlet, is discharged to the indoor space outside the cabinet after the steam generating device, and the fresh air dilutes the high-concentration formaldehyde in the indoor. The formaldehyde in the indoor can be discharged to the outdoor through the gap such as the door joint.

[0123] When the indoor formaldehyde concentration is lower than the second preset concentration, the baffle is rotated to close the outdoor air inlet and open the indoor air inlet. The second preset concentration can be set as the safe concentration of formaldehyde, which can be the national safety standard value of formaldehyde. When the indoor formaldehyde concentration is lower than the second preset concentration, the indoor formaldehyde concentration is within the safe concentration range of human body, so the fresh air can be closed and the indoor air inlet can be opened for the next formaldehyde removal cycle.

[0124] With reference to Figure 21 In some embodiments, when the human sensor detects that there is a person in the room, the user opens the formaldehyde removal function to perform the formaldehyde removal cycle, the steam generating device is opened, and the electric heating element operates at the second power to generate steam to warm and humidify the indoor air.

[0125] After the electric heating element operates at the second power for a third preset time, the steam generating device is stopped, and the outdoor air inlet is opened to introduce fresh air into the room, so that when there is a person in the room, fresh air is introduced in time to dilute the indoor formaldehyde concentration, and harm to the person in the room caused by high indoor formaldehyde concentration is avoided. The third preset time is greater than the first preset time, and the third preset time can be set to ninety minutes.

[0126] When it is detected that there is a person in the room, the outdoor air inlet is opened for a fourth preset time, then the outdoor air inlet is closed and the indoor air inlet is opened, and the electric heating element operates at the second power to generate steam to warm and humidify the indoor air. The fourth preset time can have the same value as the third preset time. Fresh air is introduced into the room for a long time to dilute the indoor formaldehyde concentration. After the fourth preset time, the indoor formaldehyde concentration is already low, at this time, the outdoor air inlet is closed, the indoor air inlet is opened, and the electric heating element is used to warm and humidify the liquid to generate steam, so that the room is in a high-temperature and high-humidity environment to promote the release of formaldehyde in the furniture, and the effect of cyclic formaldehyde removal is achieved.

[0127] In some embodiments, the air conditioner further comprises an air conditioner indoor unit and an air conditioner outdoor unit, and an outdoor heat exchanger is arranged in the air conditioner outdoor unit. The refrigerant flows between the outdoor heat exchanger and the indoor heat exchanger to complete heat exchange.

[0128] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0129] In the present application, unless specifically defined otherwise and limited, the terms "mount", "connected", "connection", "fixed", and the like, should be construed as being broadly, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, or electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0130] In the present application, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features.

[0131] In the present application, unless specifically defined otherwise and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0132] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0133] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An indoor unit for an air conditioner, characterized in that, It includes: The housing is provided with an indoor air inlet and an outdoor air inlet; An indoor heat exchanger is disposed inside the casing; A heat exchange fan is installed inside the casing. The operation of the heat exchange fan introduces indoor air into the casing through the heat exchange air inlet, and the air is heated by the indoor heat exchanger to form a heat exchange airflow. The heat exchange airflow is output to the room under the operation of the heat exchange fan. A steam generator is disposed inside the housing and connected to the indoor air inlet and / or the outdoor air inlet. The steam generator includes an electric heating element for heating a liquid to generate steam and releasing it outside the housing. The controller is configured to: when the indoor temperature is within a first preset range, turn on the steam generator, and the electric heating element operates at a first power to generate steam to heat and humidify the indoor air; When the indoor temperature is lower than the lower limit of the first preset range, the indoor heat exchanger is used as a condenser to run for a first preset time, the speed of the heat exchange fan increases, the steam generator is turned on, and the electric heating element operates at a second power to generate steam to heat and humidify the indoor air, wherein the second power is greater than the first power. When the indoor temperature exceeds the upper limit of the first preset range, the indoor heat exchanger stops operating; When the indoor temperature is higher than the upper limit of the first preset range, detect whether the indoor humidity is higher than the first preset humidity. When the indoor humidity is higher than the first preset humidity, the steam generator stops operating; When the indoor humidity is higher than the first preset humidity, the indoor formaldehyde concentration is detected; When the indoor formaldehyde concentration is higher than the first preset concentration, the outdoor air inlet is opened to introduce fresh air into the room.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The first preset range includes a first range and a second range, wherein the lower limit of the first range is higher than the upper limit of the second range; When the indoor temperature is within the second range, the indoor heat exchanger is used as a condenser to run for a second preset time, the speed of the heat exchange fan increases, the steam generator is turned on, and the electric heating element operates at a first power to generate steam to heat and humidify the indoor air.

3. The indoor unit of the air conditioner according to claim 2, characterized in that, When the indoor temperature is higher than the upper limit of the first preset range and the indoor humidity is not higher than the first preset humidity, the steam generator is turned on and the electric heating element operates at the first power to generate steam to heat and humidify the indoor air.

4. The indoor unit of the air conditioner according to claim 3, characterized in that, When the indoor formaldehyde concentration is higher than the first preset concentration, the outdoor air inlet is opened to introduce fresh air into the room. When the indoor formaldehyde concentration is lower than the second preset concentration, the outdoor air inlet is closed and the indoor air inlet is opened.

5. An indoor unit for an air conditioner, characterized in that, include: The housing is provided with an indoor air inlet and an outdoor air inlet; An indoor heat exchanger is disposed inside the casing; A heat exchange fan is installed inside the casing. The operation of the heat exchange fan introduces indoor air into the casing through the heat exchange air inlet, and the air is heated by the indoor heat exchanger to form a heat exchange airflow. The heat exchange airflow is output to the room under the operation of the heat exchange fan. A steam generator is disposed inside the housing and connected to the indoor air inlet and / or the outdoor air inlet. The steam generator includes an electric heating element for heating a liquid to generate steam and releasing it outside the housing. Human presence sensor, used to detect whether there are people indoors; The controller is configured as follows: When someone is detected indoors, the steam generator is turned on, and the electric heating element operates at the second power to generate steam to heat and humidify the indoor air. After the electric heating element operates at the second power for a third preset time, the steam generator stops operating and the outdoor air inlet is opened to introduce fresh air into the room. When no one is detected indoors, the indoor heat exchanger stops operating, and the heat exchange fan starts operating at a first speed for a first time before detecting the indoor formaldehyde concentration. When the indoor formaldehyde concentration is detected to be higher than the initial indoor formaldehyde concentration set value, the speed of the heat exchange fan is increased.

6. The indoor unit of the air conditioner according to claim 5, characterized in that, When someone is detected indoors, the outdoor air inlet is opened for a fourth preset time, then closed, and the indoor air inlet is opened. The electric heating element operates at the second power to generate steam to heat and humidify the indoor air.

7. The indoor unit of the air conditioner according to claim 6, characterized in that, When the indoor formaldehyde concentration is detected to be no higher than the set amplitude of the initial indoor formaldehyde concentration, the heat exchange fan operates at the first speed.

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