Air conditioner and defrosting method thereof

Abstract

The application relates to an air conditioner and a defrosting method thereof, and belongs to the technical field of air conditioners, which comprises an outdoor unit and an indoor unit, the outdoor unit is internally provided with a first heat exchanger, a throttling unit, a second heat exchanger and a compressor which are sequentially connected, and the outdoor unit has an upper cavity and a lower cavity; the first heat exchanger is arranged in the upper cavity and divides the upper cavity into a first sub-cavity and a second sub-cavity, the indoor unit is communicated with the first sub-cavity and the second sub-cavity respectively, air in the second sub-cavity is circulated by flowing through the first heat exchanger and then being transmitted back to the indoor unit through the first sub-cavity; an opening is arranged between the first sub-cavity and the lower cavity, a switch assembly for controlling the opening and closing of the opening is arranged at the opening, and air in the first sub-cavity is blown to the second heat exchanger through the opening when the opening is opened. The air conditioner and the defrosting method thereof provided by the application effectively avoid the problem that indoor heating is interrupted due to air conditioner defrosting, and improve the heating efficiency.

Description

Technical Field

[0001] This application belongs to the field of air conditioning technology, specifically relating to an air conditioner and its defrosting method. Background Technology

[0002] Air conditioning is an indispensable appliance in daily life, changing indoor temperature through its internal heat pump system.

[0003] In existing technology, air conditioners consist of indoor and outdoor units. The indoor unit is located indoors, and the outdoor unit is located outdoors, connected by refrigerant pipes. When the air conditioner is in heating mode, the outdoor unit is prone to frost formation in cold environments. After frost forms on the outdoor unit, the air conditioner switches from heating mode to defrost mode to remove the frost.

[0004] When an air conditioner switches from heating mode to defrost mode, it stops supplying heat to the room, causing the indoor temperature to drop and failing to meet heating needs. Summary of the Invention

[0005] This application provides an air conditioner and a defrosting method thereof, which uses hot air generated in the air conditioner's heating mode to directly defrost the frosted areas of the air conditioner, ensuring the normal operation of the air conditioner and providing continuous heating.

[0006] In a first aspect, an air conditioner is proposed, comprising: an outdoor unit and an indoor unit, wherein the outdoor unit is provided with a first heat exchanger, a throttling unit, a second heat exchanger and a compressor connected in sequence, the compressor is connected to the first heat exchanger, and the outdoor unit has an upper cavity and a lower cavity;

[0007] The first heat exchanger is disposed in the upper cavity and divides the upper cavity into a first sub-cavity and a second sub-cavity. The indoor unit is connected to the first sub-cavity and the second sub-cavity respectively. The air entering the second sub-cavity from the indoor unit flows through the first heat exchanger and then returns to the indoor unit through the first sub-cavity to form a circulation.

[0008] The throttling unit, the second heat exchanger, and the compressor are disposed in the lower cavity. An opening is provided between the first sub-cavity and the lower cavity. A switch assembly for controlling the opening and closing of the opening is provided at the opening. The second heat exchanger is located near the opening.

[0009] When the opening is open, the air in the first sub-cavity is blown through the opening toward the second heat exchanger.

[0010] In the above-mentioned optional technical solutions, the lower cavity is further provided with a partition, which divides the lower cavity into a third sub-cavity and a fourth sub-cavity. The second heat exchanger is disposed in the third sub-cavity, and the throttling unit and the compressor are disposed in the fourth sub-cavity.

[0011] In the above-mentioned optional technical solutions, a first vent and a second vent are respectively provided on the sidewalls of the opposite sides of the fourth sub-cavity, and the second heat exchanger is located between the first vent and the second vent.

[0012] In the above-mentioned optional technical solutions, the second sub-cavity is connected to the indoor unit through a ventilation duct, and a filter screen is provided on the ventilation duct.

[0013] In the above-mentioned optional technical solutions, the switching assembly includes a motor, a valve stem, and a valve plate. The motor is disposed in the first sub-cavity. The motor is connected to the valve plate through the valve stem. The motor drives the valve stem to move, and the valve stem controls the valve plate to open or close the opening.

[0014] In the above-mentioned optional technical solutions, a fresh air inlet is also provided on the side wall of the second sub-cavity, which is used to supply fresh air to the second sub-cavity.

[0015] Secondly, a defrosting method for an air conditioner is proposed, wherein the air conditioner is the one described in the first aspect, comprising:

[0016] The temperature values ​​of each component inside the air conditioner are obtained, and a data set is generated;

[0017] Calculate the temperature difference value of each component of the air conditioner based on the data in the data set;

[0018] The defrosting difference is obtained based on the change in the temperature difference over a preset time period;

[0019] Determine whether the defrost difference is greater than a preset defrost difference; if the defrost difference is greater than the preset defrost difference within a preset time.

[0020] When the switch assembly of the air conditioner is activated, the opening of the air conditioner is opened, and some of the warm air in the first cavity of the air conditioner is blown through the opening to the second heat exchanger of the air conditioner.

[0021] In the above-mentioned optional technical solutions, obtaining the temperature values ​​of each component of the air conditioner specifically involves:

[0022] The temperature values ​​of the liquid outlet pipe of the first heat exchanger, the indoor unit casing of the air conditioner, the liquid outlet pipe of the second heat exchanger, and the outdoor unit casing of the air conditioner are obtained.

[0023] In the above-mentioned optional technical solutions, the step of calculating the temperature difference value of each component of the air conditioner based on the data in the data group specifically involves:

[0024] Based on the data in the data set, calculate the first temperature difference between the liquid outlet pipe of the first heat exchanger and the outer casing of the indoor unit, and the second temperature difference between the liquid outlet pipe of the second heat exchanger and the outer casing of the outdoor unit.

[0025] In the above-mentioned optional technical solutions, the step of determining whether the defrost difference is greater than a preset defrost difference, and if the defrost difference is greater than the preset defrost difference within a preset time, specifically involves:

[0026] Calculate the change in the first temperature difference value within a preset time period to obtain the internal defrosting difference value;

[0027] Calculate the change in the second temperature difference value within a preset time period to obtain the external defrosting difference value;

[0028] Determine whether the internal defrost difference is greater than the preset internal defrost difference;

[0029] Determine whether the external defrost difference is greater than the preset external defrost difference.

[0030] Those skilled in the art will understand that the present invention provides an air conditioner and a defrosting method thereof, comprising an outdoor unit and an indoor unit. The outdoor unit contains a first heat exchanger, a throttling unit, a second heat exchanger, and a compressor connected in sequence. The compressor is connected to the first heat exchanger. The outdoor unit has an upper cavity and a lower cavity. The first heat exchanger is disposed in the upper cavity, dividing the upper cavity into a first sub-cavity and a second sub-cavity. The indoor unit communicates with both the first and second sub-cavities. Air entering the second sub-cavity from the indoor unit flows through the first heat exchanger and then returns to the indoor unit through the first sub-cavity, forming a circulation. The throttling unit, the second heat exchanger, and the compressor are disposed in the lower cavity. An opening is provided between the first sub-cavity and the lower cavity. A switch assembly for controlling the opening and closing of the opening is provided at the opening. The second heat exchanger is located near the opening. When the opening is open, air in the first sub-cavity is blown towards the second heat exchanger through the opening. Defrosting of the outdoor unit is initiated by calculating the temperature difference between the components and comparing it with a preset defrosting temperature difference. The air conditioner and its defrosting method provided by this invention effectively avoid the problem of indoor heating interruption caused by air conditioner defrosting, and improve heating efficiency. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0032] Figure 1 The diagram showing the usage status of an air conditioner provided by this invention;

[0033] Figure 2 This is a schematic diagram of the outdoor unit structure of an air conditioner provided by the present invention;

[0034] Figure 3 A top view of the third sub-cavity of the air conditioner provided by the present invention;

[0035] Figure 4A side sectional view of the third sub-cavity of the air conditioner provided by the present invention;

[0036] Figure 5 A schematic diagram of the valve plate structure of an air conditioner provided by the present invention;

[0037] Figure 6 A schematic diagram of the heat exchanger structure of the air conditioner provided by the present invention;

[0038] Figure 7 A schematic diagram of the first heat exchanger structure of the air conditioner provided by the present invention;

[0039] Figure 8 A schematic diagram of the structure of the second heat exchanger of the air conditioner provided by the present invention;

[0040] Figure 9 A schematic diagram of the filter structure of an air conditioner provided by the present invention;

[0041] Figure 10 A front view of the indoor unit of an air conditioner provided by the present invention;

[0042] Figure 11 A side view of the indoor unit of an air conditioner provided by the present invention;

[0043] Figure 12 A top view of the indoor unit of an air conditioner provided by the present invention;

[0044] Figure 13 A schematic diagram of the fresh air inlet structure of an air conditioner provided by the present invention;

[0045] Figure 14 A flowchart of the defrosting method for an air conditioner provided by the present invention.

[0046] Figure label:

[0047] 10-First temperature sensor; 20-Second temperature sensor; 30-Third temperature sensor; 40-Fourth temperature sensor; 100-Outdoor unit; 110-First heat exchanger; 120-Throttling unit; 130-Second heat exchanger; 140-Compressor; 150-Upper cavity; 151-First sub-cavity; 152-Second sub-cavity; 153-Fresh air inlet; 160-Lower cavity; 161-Third sub-cavity; 162-Fourth sub-cavity; 163-First vent; 164-Second vent; 165-Opening; 200-Indoor unit; 210-Indoor unit air outlet; 300-Ventilation duct; 310-Outdoor unit air outlet; 320-Outdoor unit air inlet; 400-Switch assembly; 410-Valve plate; 420-Motor; 430-Valve stem; 500-Filter screen; 600-Display panel; 700-Receiving unit; 800-Baffle.

[0048] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0051] In this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0052] In the description of the embodiments of this application, it should be understood that the terms "inner", "outer", "upper", "bottom", "front", "rear", etc., indicate the orientation or positional relationship (if any) based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0053] As described in the background section, existing air conditioners primarily use indoor and outdoor units 100 for cooling and heating. The indoor unit 200 is located indoors, and the outdoor unit 100 is located outdoors, connected by refrigerant pipes. In heating mode, the outdoor unit 100 is prone to frost formation in cold environments. Once frost has formed on the outdoor unit 100, the air conditioner switches from heating mode to defrost mode. When switching from heating to defrost mode, the air conditioner stops supplying heat to the indoor unit, causing the indoor temperature to drop and failing to meet heating needs.

[0054] To address the above problems, the present invention provides an air conditioner, such as... Figure 1 , Figure 2 As shown, Figure 1 The diagram showing the usage status of an air conditioner provided by this invention; Figure 2 This is a schematic diagram of the structure of the outdoor unit 100 of the air conditioner provided by the present invention. The air conditioner includes an outdoor unit 100 and an indoor unit 200. The outdoor unit 100 is provided with a first heat exchanger 110, a throttling unit 120, a second heat exchanger 130 and a compressor 140 connected in sequence. The compressor 140 is connected to the first heat exchanger 110. The outdoor unit 100 has an upper cavity 150 and a lower cavity 160.

[0055] The first heat exchanger 110 is disposed in the upper cavity 150, dividing the upper cavity 150 into a first sub-cavity 151 and a second sub-cavity 152. The indoor unit 200 is connected to the first sub-cavity 151 and the second sub-cavity 152 respectively. The air entering the second sub-cavity 152 from the indoor unit 200 flows through the first heat exchanger 110 and then returns to the indoor unit 200 through the first sub-cavity 151 to form a circulation.

[0056] Throttling unit 120, second heat exchanger 130 and compressor 140 are disposed in lower cavity 160. An opening 165 is provided between first sub-cavity 151 and lower cavity 160. A switch assembly 400 for controlling the opening and closing of opening 165 is provided at opening 165. Second heat exchanger 130 is close to opening 165.

[0057] When opening 165 is open, the air in the first sub-cavity 151 is blown through opening 165 to the second heat exchanger 130.

[0058] The air conditioner provided by this invention, by setting a first heat exchanger 110 in the outdoor unit 100 and using the hot air generated by the first heat exchanger 110 during the heating cycle to defrost the second heat exchanger 130, effectively avoids the problem of indoor heating interruption caused by air conditioner defrosting and improves heating efficiency.

[0059] The outdoor unit 100 and the indoor unit 200 are connected to the outdoor unit 100 via two ventilation ducts 300, which are respectively connected to the first sub-cavity 151 and the second sub-cavity 152 of the outdoor unit 100. The first sub-cavity 151 delivers processed air to the indoor unit 200, and the indoor unit 200 delivers indoor air to be processed to the second sub-cavity 152. Depending on the different needs, the air processing is divided into cooling or heating.

[0060] It should be noted that frosting only occurs when the temperature is below zero degrees Celsius. During the refrigeration cycle, the temperature of all components in an air conditioner is above zero degrees Celsius; therefore, the defrosting method of this invention is not applicable to the refrigeration cycle.

[0061] In the heating cycle, the first heat exchanger 110 heats and the second heat exchanger 130 cools. When the temperature of the second heat exchanger 130 drops below zero while cooling, frost will form on the surface of the second heat exchanger 130. This invention adjusts the air conditioning structure to address the frost formation on the second heat exchanger 130 in order to achieve the purpose of defrosting. Therefore, the air conditioner and its defrosting method of this invention are both for the heating cycle.

[0062] This invention divides the outdoor unit 100 into an upper cavity 150 and a lower cavity 160 via a partition 800. The upper cavity 150 is used for indoor air circulation, and the lower cavity 160 is used for outdoor air circulation. A first heat exchanger 110 is installed in the middle of the upper cavity 150. The first heat exchanger 110 is a plate heat exchanger, which divides the upper cavity 150 into a first sub-cavity 151 and a second sub-cavity 152. Cold air in the second sub-cavity 152 is heated by the first heat exchanger 110 and then enters the first sub-cavity 151. The hot air in the first sub-cavity 151 is then delivered to the indoor unit 200 to provide indoor heating. The switch assembly 400 and the opening 165 are both located at the top of the partition 800, while the opening 165 is only located at the bottom of the first cavity. When defrosting of the second heat exchanger 130 is required, the switch assembly 400 opens the opening 165 to transfer the hot air in the first sub-cavity 151 to the second heat exchanger 130, thus completing the defrosting process.

[0063] For example, such as Figure 6 As shown, Figure 6 The diagram shows the structure of the heat exchanger for the air conditioner provided by the present invention. An exhaust fan is also provided on the side wall of the first heat exchanger 110, and the second heat exchanger 130 has the same structure as the first heat exchanger 110.

[0064] In the above-mentioned optional technical solutions, the lower cavity 160 is also provided with a partition 800, which divides the lower cavity 160 into a third sub-cavity 161 and a fourth sub-cavity 162. The second heat exchanger 130 is disposed in the third sub-cavity 161, and the throttling unit 120 and the compressor 140 are disposed in the fourth sub-cavity 162.

[0065] The partition 800 between the upper cavity 150 and the lower cavity 160 is perpendicular to the partition 800 between the first sub-cavity 151 and the second sub-cavity 152. The four components within the outdoor unit 100—the first heat exchanger 110, the compressor 140, the second heat exchanger 130, and the throttling assembly—are interconnected via refrigerant pipes to form a refrigerant circulation system. This is the working principle of a heat pump, which is readily understood by those skilled in the art and will not be elaborated upon in this embodiment.

[0066] Opening 165 is located at the top of the third sub-cavity 161, connecting the third sub-cavity 161 and the fourth sub-cavity 162.

[0067] Among the above-mentioned optional technical solutions, such as Figure 3 As shown, Figure 3 This is a top view of the third sub-cavity 161 of the air conditioner provided by the present invention. A first vent 163 and a second vent 164 are respectively provided on the side walls of opposite sides of the third sub-cavity 161, and a second heat exchanger 130 is located between the first vent 163 and the second vent 164.

[0068] The first vent 163 and the second vent 164 have the same area. Outdoor air enters the third sub-cavity 161 through the first vent 163, flows through the second heat exchanger 130, and is discharged through the second vent 164, forming an outdoor air circulation. The second heat exchanger 130 is located near the first vent 163.

[0069] Among the above-mentioned optional technical solutions, such as Figure 9 As shown, Figure 9 This is a schematic diagram of the filter structure of the air conditioner provided by the present invention. The second sub-cavity 152 is connected to the indoor unit 200 through a ventilation duct 300, and a filter 500 is installed on the ventilation duct 300. The diameter of the filter 500 is 10-20mm.

[0070] Among the above-mentioned optional technical solutions, such as Figure 4 and Figure 5 As shown, Figure 4 A side sectional view of the third sub-cavity 161 structure of the air conditioner provided by the present invention; Figure 5 This is a schematic diagram of the valve plate 410 structure of the air conditioner provided by the present invention. The switching assembly 400 includes a motor 420, a valve stem 430 and a valve plate 410. The motor 420 is disposed in the first sub-cavity 151. The motor 420 is connected to the valve plate 410 through the valve stem 430. The motor 420 drives the valve stem 430 to move, and the valve stem 430 controls the valve plate 410 to open or close the opening 165.

[0071] The motor 420 drives the valve stem 430 to reciprocate back and forth, thereby causing the valve plate 410 to open or close the opening 165.

[0072] Among the above-mentioned optional technical solutions, such as Figure 13 As shown, Figure 13 This is a schematic diagram of the fresh air inlet 153 of the air conditioner provided by the present invention. A fresh air inlet 153 is also provided on the side wall of the second sub-cavity, and the fresh air inlet 153 is used to supply fresh air to the second sub-cavity.

[0073] like Figure 10 , 11 As shown in Figure 12, Figure 10 A front view of the indoor unit of an air conditioner provided by the present invention; Figure 11 A side view of the indoor unit of an air conditioner provided by the present invention; Figure 12This is a top view of the indoor unit of the air conditioner provided by the present invention. The indoor unit 200 has an indoor unit air outlet 210 and an indoor unit air inlet (not shown in the figure) respectively on the side walls on both sides. The indoor unit air outlet 210 and the indoor unit air inlet are connected to the outdoor unit air inlet 320 and the outdoor unit air outlet 310 respectively.

[0074] The indoor unit 200 also has a display panel 600 and a receiving unit 700 on its side wall. The receiving unit 700 is used to receive signals from the remote control, and the display panel 600 displays information such as the air conditioner's operating temperature and operating mode. The indoor unit's air outlet is also equipped with an air outlet grille, which is used to prevent dust and impurities from entering the indoor unit.

[0075] like Figure 14 As shown, Figure 14 A flowchart of the defrosting method for an air conditioner provided by the present invention. The present invention also proposes a defrosting method for the above-mentioned air conditioner, comprising:

[0076] Obtain the temperature values ​​of each component inside the air conditioner and generate a data set;

[0077] Calculate the temperature difference values ​​of each component of the air conditioner based on the data in the data set;

[0078] The defrosting difference is obtained based on the change in temperature over a preset time period;

[0079] Determine if the defrost difference is greater than the preset defrost difference. If the defrost difference is greater than the preset defrost difference within a preset time;

[0080] When the air conditioner switch assembly 400 is turned on, the air conditioner opening 165 is opened, and some of the warm air in the first chamber of the air conditioner is blown through the opening 165 to the second heat exchanger 130 of the air conditioner.

[0081] The frosting condition of the second heat exchanger 130 is determined by comparing the obtained defrosting temperature difference with the preset temperature difference value.

[0082] Among the above-mentioned optional technical solutions, such as Figure 2 , 7 8, 10 Figure 7 A schematic diagram of the structure of the first heat exchanger 110 of the air conditioner provided by the present invention; Figure 8 A schematic diagram of the structure of the second heat exchanger 130 of the air conditioner provided by the present invention; Figure 10 The above four figures show the installation positions of the temperature sensors of various components, and are front views of the indoor unit 200 of the air conditioner provided by the present invention.

[0083] Specifically, the temperature values ​​of each component of the air conditioner are obtained by: a first temperature sensor 10 located at the liquid outlet pipe of the first heat exchanger 110, a second temperature sensor 20 located on the outer casing of the indoor unit 200 of the air conditioner, a third temperature sensor 30 located at the liquid outlet pipe of the second heat exchanger 130, and a fourth temperature sensor 40 located on the outer casing of the outdoor unit 100 of the air conditioner.

[0084] Obtain the temperature values ​​of the liquid outlet pipe of the first heat exchanger 110, the outer casing of the indoor unit 200 of the air conditioner, the liquid outlet pipe of the second heat exchanger 130, and the outer casing of the outdoor unit 100 of the air conditioner, and record them as A, B, C and D respectively.

[0085] In the above-mentioned optional technical solutions, the temperature difference value of each component of the air conditioner is calculated based on the data in the data set, specifically as follows:

[0086] Based on the data in the data set, which includes temperature data for each component recorded every minute. , , , And generate data sets: , , ……, , , ……, , , ……, , , ...

[0087] Calculate the first temperature difference S between the liquid outlet pipe temperature A of the first heat exchanger 110 and the outer casing temperature B of the indoor unit 200, and the second temperature difference T between the liquid outlet pipe temperature C of the second heat exchanger 130 and the outer casing temperature D of the outdoor unit 100. Continue calculating to obtain: , ; , ;...; obtained the data set, , , , ...; , , , ……

[0088] After the air conditioner has been running for 20 minutes, and if both the air conditioner operating mode remains unchanged and the T value is less than 0°C and remains unchanged for 5 minutes (i.e., the T value is less than zero for more than 5 consecutive minutes), a judgment is made. The judgment method is as follows:

[0089] Determine if the defrost difference is greater than the preset defrost difference. If the defrost difference is greater than the preset defrost difference within a preset time, specifically:

[0090] Calculate the change in the first temperature difference S within 5 minutes to obtain the internal defrosting difference. ;

[0091] To determine whether the internal defrost difference is greater than the preset internal defrost difference, the specific calculation formula is as follows: ,in The first temperature difference value at the preset time; This is the first temperature difference value after 5 minutes; In this embodiment, the internal defrosting temperature difference is preset. =5℃.

[0092] Calculate the change in the second temperature difference value T within a preset time period to obtain the external defrosting difference value. ;

[0093] To determine whether the external defrost difference is greater than the preset external defrost difference, the specific calculation formula is as follows: ,in The second temperature difference value at the preset time. This is the second temperature difference value after 5 minutes. In this embodiment, to preset the external defrosting temperature difference, =3℃.

[0094] In the above method, when , After 5 minutes or more, the motor 420 in the switch assembly 400 is turned on, and a portion of the warm air in the first sub-chamber 151 is blown through the opening 165 to the second heat exchanger 130, which then begins to defrost.

[0095] It should be noted that the amount of warm air blown towards the second heat exchanger 130 can be determined according to the opening angle of the valve plate 410. In this embodiment, the opening angle of the valve plate 410 is 0 degrees to 90 degrees.

[0096] When defrosting needs to be stopped, you can manually change the air conditioner's operating mode to end defrosting, or the air conditioner can automatically defrost based on the defrosting status.

[0097] The automatic defrosting condition for the air conditioner is as follows: 5 minutes after entering defrost mode, T... ;and ;and The opening at 165 degrees is closed, ending the defrosting mode.

[0098] The present invention provides an air conditioner and a defrosting method thereof, which defrosts the second heat exchanger 130 by setting a first heat exchanger 110 in the outdoor unit 100, thereby realizing the air conditioner defrosting without stopping the air conditioner and without affecting the heating of the air conditioner, thus improving the heating efficiency of the air conditioner.

[0099] No refrigerant piping is required between the indoor unit 200 and the outdoor unit 100, avoiding noise pollution from the refrigerant piping and preventing the compressor 140 noise from being transmitted to the indoor unit 200 via the refrigerant piping. This reduces the overall noise level of the air conditioner and also simplifies the installation of the indoor unit 200. Furthermore, the indoor unit 200 eliminates the need for a first heat exchanger 110 and a fan, further reducing noise and significantly improving user comfort.

[0100] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An air conditioner, characterized in that, include: The unit comprises an outdoor unit and an indoor unit. The outdoor unit is equipped with a first heat exchanger, a throttling unit, a second heat exchanger, and a compressor connected in sequence. The compressor is connected to the first heat exchanger. The outdoor unit has an upper cavity and a lower cavity. The first heat exchanger is disposed in the upper cavity and divides the upper cavity into a first sub-cavity and a second sub-cavity. The indoor unit is connected to the first sub-cavity and the second sub-cavity respectively. The air entering the second sub-cavity from the indoor unit flows through the first heat exchanger and then returns to the indoor unit through the first sub-cavity to form a circulation. The throttling unit, the second heat exchanger, and the compressor are disposed in the lower cavity. An opening is provided between the first sub-cavity and the lower cavity. A switch assembly for controlling the opening and closing of the opening is provided at the opening. The second heat exchanger is located near the opening. When the opening is open, the air in the first sub-cavity is blown through the opening toward the second heat exchanger.

2. The air conditioner according to claim 1, characterized in that, The lower cavity is also provided with a partition, which divides the lower cavity into a third sub-cavity and a fourth sub-cavity. The second heat exchanger is disposed in the third sub-cavity, and the throttling unit and the compressor are disposed in the fourth sub-cavity.

3. The air conditioner according to claim 2, characterized in that, The third sub-cavity has a first vent and a second vent on its opposite sidewalls, and the second heat exchanger is located between the first vent and the second vent.

4. The air conditioner according to claim 1, characterized in that, The second sub-cavity is connected to the indoor unit via a ventilation duct, and a filter screen is installed on the ventilation duct.

5. The air conditioner according to claim 1, characterized in that, The switching assembly includes a motor, a valve stem, and a valve plate. The motor is disposed in the first sub-cavity and is connected to the valve plate through the valve stem. The motor drives the valve stem to move, and the valve stem controls the valve plate to open or close the opening.

6. The air conditioner according to claim 1, characterized in that, A fresh air inlet is also provided on the side wall of the second sub-cavity, which is used to supply fresh air to the second sub-cavity.

7. A defrosting method for an air conditioner, characterized in that, The air conditioner is the air conditioner according to any one of claims 1-6, comprising: The temperature values ​​of each component inside the air conditioner are obtained, and a data set is generated; Calculate the temperature difference value of each component of the air conditioner based on the data in the data set; The defrosting difference is obtained based on the change in the temperature difference over a preset time period; Determine whether the defrost difference is greater than a preset defrost difference; if the defrost difference is greater than the preset defrost difference within a preset time. When the switch assembly of the air conditioner is activated, the opening of the air conditioner is opened, and some of the warm air in the first cavity of the air conditioner is blown through the opening to the second heat exchanger of the air conditioner.

8. The defrosting method for an air conditioner according to claim 7, characterized in that, The specific steps for obtaining the temperature values ​​of various components inside the air conditioner are as follows: The temperature values ​​of the liquid outlet pipe of the first heat exchanger, the indoor unit casing of the air conditioner, the liquid outlet pipe of the second heat exchanger, and the outdoor unit casing of the air conditioner are obtained.

9. The defrosting method for an air conditioner according to claim 8, characterized in that, The step of calculating the temperature difference value of each component of the air conditioner based on the data in the data group is specifically as follows: Based on the data in the data set, calculate the first temperature difference between the liquid outlet pipe of the first heat exchanger and the outer casing of the indoor unit, and the second temperature difference between the liquid outlet pipe of the second heat exchanger and the outer casing of the outdoor unit.

10. The defrosting method for an air conditioner according to claim 9, characterized in that, The step of determining whether the defrost difference is greater than a preset defrost difference, specifically if the defrost difference is greater than the preset defrost difference within a preset time period, involves: Calculate the change in the first temperature difference value within a preset time period to obtain the internal defrosting difference value; Calculate the change in the second temperature difference value within a preset time period to obtain the external defrosting difference value; If the internal defrost difference is greater than the preset internal defrost difference; Furthermore, the external defrosting difference is greater than the preset external defrosting difference.

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