Air conditioner

Abstract

The application provides an air conditioner. The air conditioner comprises a casing, a heat exchange air duct arranged in the casing, and two ends of the heat exchange air duct are communicated with a cooled space or a heated space. The heat exchange air duct has a vertical air duct section extending from top to bottom. A heat exchanger is arranged in the vertical air duct section. The heat exchanger comprises a plurality of heat exchange parts arranged in sequence from top to bottom. Each heat exchange part comprises a plurality of fins arranged in the horizontal direction. In each two adjacent heat exchange parts, the minimum distance between the fins of the lower heat exchange part is greater than the maximum distance between the fins of the upper heat exchange part. The width of the heat exchanger in the front-back direction can be reduced, and the width of the indoor unit in the front-back direction can be reduced. The indoor unit can also be installed outdoors.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning technology, in particular to an air conditioner. BACKGROUND

[0002] With the change of living environment, people have higher and higher requirements for the performance and appearance of air conditioners. With the increasing number of small-sized houses in big cities, people have higher and higher requirements for the size of air conditioners, especially indoor units, the air outlet direction of air conditioners and noise. Figure 1 As shown in the prior art, the overall size of the evaporator 100 is large due to the setting form of the evaporator 100, thereby limiting the reduction of the front-to-back thickness of the indoor unit. SUMMARY

[0003] In view of the above problems, the present application is proposed to provide an air conditioner which overcomes the above problems or at least partially solves the above problems, can solve the problems of large volume, large noise and uneven temperature caused by the large volume of air conditioners, especially indoor units, and achieve the effects of improving the utilization rate of indoor space, reducing noise and more uniform indoor temperature adjustment.

[0004] Specifically, the present application provides an air conditioner, comprising:

[0005] a casing, wherein a heat exchange air duct is arranged in the casing, and the two ends of the heat exchange air duct are open and communicate with a cooled space or a heated space; the heat exchange air duct has a vertical air duct section extending from top to bottom;

[0006] a heat exchanger arranged in the vertical air duct section; the heat exchanger comprises a plurality of heat exchange portions arranged in sequence from top to bottom; each heat exchange portion comprises a plurality of fins arranged in the horizontal direction; in each adjacent two heat exchange portions, the minimum distance between the fins of the lower heat exchange portion is greater than the maximum distance between the fins of the upper heat exchange portion; or, in each adjacent two heat exchange portions, the maximum distance between the fins of the lower heat exchange portion is less than the minimum distance between the fins of the upper heat exchange portion.

[0007] Optionally, it further comprises an air supply device configured to promote the airflow from the cooled space or the heated space into the heat exchange air duct, and return to the cooled space or the heated space after sequentially exchanging heat with the plurality of heat exchange portions;

[0008] the air supply device comprises two fans arranged in the heat exchange air duct and respectively located at the air inlet side and the air outlet side of the heat exchanger;

[0009] the air supply device has a reversing air supply function to make the airflow in the heat exchange air duct flow from bottom to top or from top to bottom.

[0010] Optionally, each of the heat exchange sections comprises at least one horizontally arranged heat exchange pipe, and the fins of each of the heat exchange sections are arranged on the heat exchange pipe of the heat exchange section.

[0011] Optionally, the ratio between the width and the height of the fins of each of the heat exchange sections is 0.5 to 1.5.

[0012] Optionally, in each of the two adjacent heat exchange sections, the minimum distance between the fins of the lower heat exchange section is greater than the maximum distance between the fins of the upper heat exchange section, and the height of the fins of the lower heat exchange section is greater than the height of the fins of the upper heat exchange section; or, the maximum distance between the fins of the lower heat exchange section is less than the minimum distance between the fins of the upper heat exchange section, and the height of the fins of the lower heat exchange section is less than the height of the fins of the upper heat exchange section.

[0013] Optionally, in each of the two adjacent heat exchange sections, the minimum distance between the fins of the lower heat exchange section is greater than the maximum distance between the fins of the upper heat exchange section, and the number of the heat exchange pipes of the lower heat exchange section is greater than the number of the heat exchange pipes of the upper heat exchange section; or, in each of the two adjacent heat exchange sections, the maximum distance between the fins of the lower heat exchange section is less than the minimum distance between the fins of the upper heat exchange section, and the number of the heat exchange pipes of the lower heat exchange section is less than the number of the heat exchange pipes of the upper heat exchange section.

[0014] Optionally, the fins of each of the heat exchange sections are arranged equidistantly in the horizontal direction, and in each of the two adjacent heat exchange sections, the fins of the heat exchange section with fewer fins extend from the corresponding fins of the other heat exchange section.

[0015] Optionally, the two ends of the heat exchange air duct are respectively an upper end opening and a lower end opening, and the upper end opening and the lower end opening are respectively above and below the heat exchange sections.

[0016] The upper end opening is arranged on one side of the cabinet perpendicular to the length direction of the heat exchange sections, and the lower end opening is arranged on one side of the cabinet perpendicular to the length direction of the heat exchange sections.

[0017] In the uppermost heat exchange section, the density of the fins gradually decreases from one end close to the upper end opening to the other end; and the upper end opening is an air outlet.

[0018] In the lowermost heat exchange section, the density of the fins gradually increases from one end close to the lower end opening to the other end; and the lower end opening is an air inlet.

[0019] Optionally, further comprising an outer pipe and an air outlet pipe; and the cabinet is arranged outside the space to be cooled or the space to be heated.

[0020] The air outlet pipe has an air outlet section and a flared guide section; the air outlet section and the flared guide section are circular in cross section; the outer end of the air outlet section is connected to the end opening of the heat exchange air duct for blowing out cold air flow;

[0021] The outer pipe comprises a first sleeving section, a second sleeving section, and a vertical ring plate section connecting the first sleeving section and the second sleeving section; the first sleeving section penetrates the space wall of the cooled space or the heated space;

[0022] The inner end of the second sleeving section extends inward to form a flange; the vertical ring plate section, the second sleeving section, and the flange define a water storage cavity;

[0023] Part or all of the air outlet section is arranged inside the first sleeving section, and part or all of the flared guide section is arranged inside the second sleeving section; the diameter of the opening edge of the flared guide section is greater than the diameter of the edge of the flange.

[0024] Optionally, the outer end of the outer pipe is sealingly connected to the outer end of the air outlet section;

[0025] The air conditioner further comprises:

[0026] An atomization device for atomizing the condensed water in the water storage cavity;

[0027] A connecting pipe, one end of the connecting pipe being in communication with the first sleeving section to communicate with the water storage cavity through the outer pipe, the connecting pipe guiding the atomized condensed water into the heat exchange air duct and to the air inlet side of the heat exchanger in refrigeration;

[0028] A water level detection device for detecting the water level in the water storage cavity to start the atomization device according to the water level in the water storage cavity.

[0029] In the air conditioner of the present application, the cabinet can be the cabinet of an indoor unit. Since the heat exchange air duct has a vertical air duct section extending from top to bottom, and the heat exchanger has a plurality of heat exchange sections arranged in sequence from top to bottom, each of the heat exchange sections comprising a plurality of fins, and the plurality of heat exchange sections are configured with gradually changing fin spacing, the heat exchange sections can be stacked for work, which can significantly reduce the width of the heat exchanger in the front-rear direction, and further reduce the width of the indoor unit in the front-rear direction. This indoor unit can also be installed outdoors. The gradually changing fin spacing can reduce air resistance and will not reduce the heating or cooling efficiency of the air conditioner due to the stacking of the heat exchange sections.

[0030] And, the fin density arrangement, because the total number of fins and the total area is the same, the heat exchanger from top to bottom blowing, or from bottom to top blowing, the air flow rate and temperature of the outlet is the same, the total cooling or heating efficiency will not decrease. The two kinds of fin settings of the heat exchanger can make the air conditioner more targeted in the region when selling, according to the climate difference between north and south, the frequency of using cooling or heating mode is different, the most suitable fin setting of the heat exchanger is adopted.

[0031] Further, in the air conditioner of the present application, the air supply device has a reversing air supply function, which makes the air flow in the heat exchange air duct flow from bottom to top or from top to bottom in the cooling or heating mode of the air conditioner, which is more conducive to cooling or heating in the room and improves the cooling or heating efficiency in the room. The air supply device includes two fans arranged in the heat exchange air duct and located at the air inlet side and the air outlet side of the heat exchanger respectively, and has a large air supply volume.

[0032] Further, in the air conditioner of the present application, the fin spacing and fin height are different in each adjacent two heat exchange parts, which can adapt the heat dissipation area of the heat exchange pipe to the fin and improve the heat exchange efficiency.

[0033] Further, in the air conditioner of the present application, the heat exchange pipe is less in the heat exchange part with small fin spacing, and the air resistance is small at this time, and the fin heat exchange capacity may be sufficient, while the heat exchange pipe is more in the heat exchange part with large fin spacing, and the fin heat exchange capacity is relatively insufficient. Through the integral connection of the fins on the different heat exchange parts, it is ensured that the fins corresponding to the less pipes can receive the heat of the fins corresponding to the more pipes when the heat exchanger is working, which can ensure the overall heat exchange efficiency under smooth ventilation and has unexpected technical effects.

[0034] Further, in the air conditioner of the present application, when the upper end opening is the air outlet and the lower end opening is the air inlet, the fin density gradually increases in the uppermost heat exchange part from one end close to the upper end opening to the other end, and the fin density gradually decreases in the lowermost heat exchange part from one end close to the lower end opening to the other end. This structure can reduce the air inlet resistance, facilitate the air flow to the side away from the air inlet, and increase the heat exchange efficiency of the air outlet where the air volume is large.

[0035] Further, in the air conditioner of the present application, an outer pipe is arranged outside the air outlet pipe, the outer pipe can pass through the wall, the condensed water on the flared guide section of the air outlet pipe enters the water storage cavity of the outer pipe, and the condensed water generated at the air outlet of the air conditioner is prevented from wetting the wall. Since the outer pipe is provided, the condensed water on the outer wall of the air outlet pipe can also be prevented from affecting the wall. The air conditioner further comprises an atomizing device and a water level monitoring device to prevent the condensed water from accumulating too much and overflowing from the water storage cavity to wet the wall.

[0036] The above and other objects, advantages and features of the present application will become more apparent from the following detailed description of specific embodiments thereof, when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] Some specific embodiments of the present application will be described in detail with reference to the accompanying drawings, in which the same or similar components are denoted by the same reference numerals, and wherein:

[0038] Figure 1 is a schematic structural view of an indoor unit evaporator in the prior art;

[0039] Figure 2 is a schematic partial structural view of an air conditioner according to an embodiment of the present application;

[0040] Figure 3 is a schematic structural view of a heat exchanger of an air conditioner according to an embodiment of the present application;

[0041] Figure 4 is a schematic sectional view of an assembly of an outer tube and an air outlet tube of an air conditioner according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] An air conditioner according to an embodiment of the present application will be described below with reference to Figures 2 to 4 In the description of the present embodiment, it should be understood that the terms "first", "second", etc. are used only for the purpose of description, and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features, i.e. one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited. When a certain feature "includes or comprises" a certain or certain features, unless otherwise specifically described, it indicates that other features are not excluded and can further include other features.

[0043] Unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected", "fixed", "coupled" and other terms should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0044] In addition, in the description of the embodiments, the first feature being "on" or "under" the second feature can include the first and second features being in direct contact, or can include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of the embodiments, the first feature being "on", "above", and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is higher in horizontal height than the second feature. The first feature being "under", "below", or "underneath" the second feature can be the first feature being directly below or obliquely below the second feature, or merely means that the first feature is lower in horizontal height than the second feature.

[0045] In the description of the embodiments, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means 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 exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0046] Figure 2 is a schematic partial structural view of an air conditioner according to an embodiment of the present application, as Figure 2 indicated, and with reference to Figures 3 to 4 , an embodiment of the present application provides an air conditioner, comprising a casing 200, a heat exchanger 210.

[0047] The casing 200 is provided with a heat exchange air duct, and both ends of the heat exchange air duct are in communication with a cooled space or a heated space. The heat exchange air duct has a vertical air duct section extending from top to bottom. The cooled space or the heated space is an indoor space.

[0048] The heat exchanger 210 is arranged in the vertical air duct section. The heat exchanger 210 comprises a plurality of heat exchange portions 220 arranged in sequence from top to bottom. Each heat exchange portion 220 comprises a plurality of fins 230 arranged in a horizontal direction. In each of the adjacent two heat exchange portions 220, the minimum distance between the fins 230 of the lower heat exchange portion 220 is greater than the maximum distance between the fins 230 of the upper heat exchange portion 220. Alternatively, in each of the adjacent two heat exchange portions 220, the maximum distance between the fins 230 of the lower heat exchange portion 220 is less than the minimum distance between the fins 230 of the upper heat exchange portion 220. Preferably, the ratio between the width and the height of the fins 230 of each heat exchange portion 220 is 0.5 to 1.5.

[0049] Since the heat exchange air duct has vertically extending air duct sections extending from top to bottom, the heat exchanger 210 has a plurality of heat exchange sections 220 arranged one after another from top to bottom, each of the heat exchange sections 220 includes a plurality of fins 230, and the plurality of heat exchange sections 220 are arranged with gradually changed fin 230 spacing, so that the heat exchange sections 220 can be stacked for work, the width of the heat exchanger 210 in the front-rear direction can be significantly reduced, and the width of the indoor unit in the front-rear direction is further reduced. The indoor unit can also be installed outdoors. The gradually changed fin 230 spacing can reduce air resistance and will not reduce the heating or cooling efficiency of the air conditioner due to the stacking of the heat exchange sections 220.

[0050] Moreover, the fin 230 density arrangement, since the total number and total area of the fins 230 are the same, the heat exchanger 210 blows air from top to bottom or from bottom to top, the air flow rate and temperature at the air outlet are the same, and the overall cooling or heating efficiency is not reduced. The two arrangements of the fins 230 of the heat exchanger 210 described above can make the air conditioner more targeted in terms of regions when sold, and the frequency of use of the cooling or heating mode is different according to the climate difference between the north and south, and the most suitable arrangement of the fins 230 of the heat exchanger 210 is adopted.

[0051] In some embodiments of the present application, the air conditioner further comprises an air supply device, such as Figure 2 As shown, the air supply device causes the air flow to enter the heat exchange air duct from the cooled space or the heated space, and after being sequentially heat-exchanged with the plurality of heat exchange sections 220, the air flow returns to the cooled space or the heated space. Preferably, the air supply device comprises two fans arranged in the heat exchange air duct and respectively located at the air inlet side and the air outlet side of the heat exchanger 210, and the air supply amount is large.

[0052] In some embodiments of the present application, the air supply device has a reversing air supply function to make the air flow in the heat exchange air duct flow from bottom to top or from top to bottom. Specifically, both of the two fans are bidirectional fans, one is an upper fan 250 installed at the upper end of the casing 200, and the other is a lower fan 280. The reversing air supply function makes the air flow in the heat exchange air duct flow from bottom to top or from top to bottom in the cooling or heating mode of the air conditioner.

[0053] In the cooling mode of the air conditioner, the two ends of the heat exchange air duct are respectively an upper end opening 260 and a lower end opening 260. The upper end opening and the lower end opening are respectively located above and below the heat exchange sections 220. The upper fan 250 blows air out through the upper end opening 260, and the lower fan 280 sucks air in through the lower end opening 270. The air is cooled by the heat exchanger 210. In the heating mode of the air conditioner, the fan blows air out through the lower end opening 270, and the upper fan 250 sucks air in through the upper end opening 260. The air is heated by the heat exchanger 210. In the anti-direct-blowing mode of the air conditioner, there is no change in the cooling mode. In the heating mode, after the room temperature reaches the standard, the upper fan 250 blows air and the lower fan 280 sucks air automatically.

[0054] In some embodiments of the present application, each heat exchange section 220 comprises at least one horizontally arranged heat exchange pipe 240, and the fins 230 of each heat exchange section 220 are arranged on the heat exchange pipe 240. Preferably, each heat exchange section 220 has at least two heat exchange pipes 240, and the two heat exchange pipes 240 are connected in series, and the heat exchange pipes 240 between adjacent heat exchange sections 220 are also connected in series.

[0055] In some embodiments of the present application, as shown in Figure 3 the number of heat exchange pipes 240 in the heat exchange section 220 can be equal. In each adjacent two heat exchange sections 220, the minimum distance between the fins 230 of the lower heat exchange section 220 is greater than the maximum distance between the fins 230 of the upper heat exchange section 220, and the height of the fins 230 of the lower heat exchange section 220 is greater than the height of the fins 230 of the upper heat exchange section 220. Alternatively, in each adjacent two heat exchange sections 220, the maximum distance between the fins 230 of the lower heat exchange section 220 is less than the minimum distance between the fins 230 of the upper heat exchange section 220, and the height of the fins 230 of the lower heat exchange section 220 is less than the height of the fins 230 of the upper heat exchange section 220. In this way, the heat dissipation area of the heat exchange pipe 240 and the fin 230 can be adapted to improve the heat exchange efficiency.

[0056] In some embodiments of the present application, in each adjacent two heat exchange sections 220, the minimum distance between the fins 230 of the lower heat exchange section 220 is greater than the maximum distance between the fins 230 of the upper heat exchange section 220, and the number of heat exchange pipes 240 of the lower heat exchange section 220 is greater than the number of heat exchange pipes 240 of the upper heat exchange section 220. Alternatively, in each adjacent two heat exchange sections 220, the maximum distance between the fins 230 of the lower heat exchange section 220 is less than the minimum distance between the fins 230 of the upper heat exchange section 220, and the number of heat exchange pipes 240 of the lower heat exchange section 220 is less than the number of heat exchange pipes 240 of the upper heat exchange section 220. The plurality of fins 230 of each heat exchange section 220 are arranged equidistantly in the horizontal direction. In each adjacent two heat exchange sections 220, the fins 230 of the heat exchange section 220 with fewer fins 230 extend from the corresponding fins 230 of the other heat exchange section 220.

[0057] The heat exchange section 220 with smaller fin 230 spacing has fewer heat exchange pipes 240, and at this time the wind resistance is smaller, and the heat exchange capacity of the fin 230 can be sufficient. The heat exchange section 220 with larger fin 230 spacing has more heat exchange pipes 240, and the heat exchange capacity of the fin 230 is relatively insufficient. This structure ensures that when the heat exchange section 220 is working, the fins 230 corresponding to the fewer heat exchange pipes 240 can receive the heat from the fins 230 corresponding to the more heat exchange pipes 240, which can ensure the overall heat exchange efficiency under smooth ventilation, and has unexpected technical effects.

[0058] In some embodiments of the present application, the upper end opening is provided on one side of the casing 200 perpendicular to the length direction of the heat exchange portion 220. The lower end opening is provided on one side of the casing 200 perpendicular to the length direction of the heat exchange portion 220.

[0059] In the uppermost heat exchange portion 220, the density of the fins 230 gradually decreases from the end close to the upper end opening to the other end. The upper end opening is the air outlet during refrigeration.

[0060] In the lowermost heat exchange portion 220, the density of the fins 230 gradually increases from the end close to the lower end opening to the other end. The lower end opening is the air inlet during refrigeration. The air inlet and the air outlet are on the same side of the casing 200. Alternatively, they can be on two opposite sides.

[0061] In the heat exchange portion 220 of the present application, when the upper end opening is the air outlet and the lower end opening is the air inlet, in the uppermost heat exchange portion 220, the density of the fins 230 gradually increases from the end close to the upper end opening to the other end. In the lowermost heat exchange portion 220, the density of the fins 230 gradually decreases from the end close to the lower end opening to the other end. This structure can reduce the air inlet resistance, facilitate the air flow to the side away from the air inlet, and increase the heat exchange efficiency at the air outlet.

[0062] In some embodiments of the present application, as shown in Figure 4 The air conditioner further comprises an outer pipe 300 and an air outlet pipe 400. The casing 200 is arranged outside the cooled space or the heated space. The air outlet pipe 400 has an air outlet section 410 and a flared guide section 420. The cross sections of the air outlet section 410 and the flared guide section 420 are circular. The outer end of the air outlet section 410 is connected to the end opening of the heat exchange air duct for blowing out cold air flow.

[0063] The outer pipe 300 comprises a first sleeving section 310, a second sleeving section 320, and a vertical ring plate 330 section connecting the first sleeving section 310 and the second sleeving section 320. The first sleeving section 310 penetrates the space wall of the cooled space or the heated space. The inner end of the second sleeving section 320 extends inward to form a flange. The vertical ring plate 330 section, the second sleeving section 320, and the flange define a water storage cavity 340.

[0064] Part or all of the air outlet section 410 is arranged inside the first sleeving section 310. Part or all of the flared guide section 420 is located inside the second sleeving section 320. The diameter of the opening edge of the flared guide section 420 is greater than the diameter of the edge of the flange.

[0065] The air conditioner of the embodiment of the present application is provided with the outer pipe 300 outside the air outlet pipe 400, the outer pipe 300 can pass through the wall, the condensed water on the lower guide plate of the air outlet pipe 400 enters the water storage cavity 340 of the outer pipe 300, preventing the condensed water generated at the air outlet of the air conditioner from wetting the wall. Since the outer pipe 300 is provided, the condensed water on the outer wall of the air outlet pipe 400 can also be prevented from wetting the wall.

[0066] In some embodiments of the present application, the outer end of the outer pipe 300 is sealingly connected with the outer end of the air outlet section 410. The air conditioner further comprises an atomizing device 500, a connecting pipe and a water level detecting device. The atomizing device 500 is used to atomize the condensed water in the water storage cavity 340. One end of the connecting pipe is in communication with the first sleeve section 310, so as to be in communication with the water storage cavity 340 through the outer pipe 300, and the connecting pipe guides the atomized condensed water into the heat exchange air duct and to the air inlet side of the heat exchanger 210 during refrigeration. The water level detecting device is used to detect the water level in the water storage cavity 340, so as to start the atomizing device 500 according to the water level in the water storage cavity 340. This arrangement can prevent the condensed water from overflowing from the water storage cavity 340 and wetting the wall due to excessive accumulation of the condensed water.

[0067] It should be appreciated by those skilled in the art that, although the present application has been fully described and illustrated by way of a number of exemplary embodiments, various changes and modifications can be made thereto without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and appreciated to cover all such changes and modifications.

Claims

1. An air conditioner characterized by comprising: The air conditioner comprises: a casing, a heat exchange air duct being arranged in the casing, both ends of the heat exchange air duct being communicated with a cooled space or a heated space, the heat exchange air duct having a vertical air duct section extending from top to bottom; a heat exchanger arranged in the vertical air duct section, the heat exchanger comprising a plurality of heat exchange portions arranged in sequence from top to bottom, each of the heat exchange portions comprising a plurality of fins, the plurality of fins being arranged in the horizontal direction at intervals, the maximum distance between the fins of the lower heat exchange portion being smaller than the minimum distance between the fins of the upper heat exchange portion in each of the adjacent two heat exchange portions, the height of the fins of the lower heat exchange portion being smaller than the height of the fins of the upper heat exchange portion in each of the adjacent two heat exchange portions; the upper end opening and the lower end opening being arranged on one side of the casing perpendicular to the length direction of the heat exchange portion, the upper end opening being an air outlet during refrigeration, the lower end opening being an air inlet during refrigeration, the density of the fins gradually increasing in the uppermost heat exchange portion from one end close to the upper end opening to the other end, the density of the fins gradually decreasing in the lowermost heat exchange portion from one end close to the lower end opening to the other end; the air conditioner further comprises an air supply device configured to cause air flow to enter the heat exchange air duct from the cooled space or the heated space, return to the cooled space or the heated space after sequentially exchanging heat with the plurality of heat exchange portions; the air supply device has a reversing air supply function to cause the air flow in the heat exchange air duct to flow from bottom to top or from top to bottom.

2. The air conditioner according to claim 1, wherein the air supply device comprises two air fans arranged in the heat exchange air duct and respectively located on the air inlet side and the air outlet side of the heat exchanger.

3. The air conditioner of claim 1, wherein Each of the heat exchange portions comprises at least one heat exchange pipe arranged horizontally, and the fins of each of the heat exchange portions are arranged on the heat exchange pipe of the heat exchange portion.

4. The air conditioner of claim 1, wherein The ratio between the width and the height of the fins of each of the heat exchange portions is 0.5 to 1.

5.

5. The air conditioner of claim 3, wherein In each of the adjacent two heat exchange portions, the maximum distance between the fins of the lower heat exchange portion is smaller than the minimum distance between the fins of the upper heat exchange portion, and the number of the heat exchange pipes of the lower heat exchange portion is smaller than the number of the heat exchange pipes of the upper heat exchange portion.

6. The air conditioner of claim 5, wherein The plurality of fins of each of the heat exchange portions are arranged at equal intervals in the horizontal direction, and the fins of the heat exchange portion with fewer fins extend from the corresponding fins of the other heat exchange portion in each of the adjacent two heat exchange portions.

7. The air conditioner of claim 1, wherein The air conditioner further comprises an outer pipe and an air outlet pipe, and the casing is arranged outside the cooled space or the heated space. The air outlet pipe has an air outlet section and a flared guide section, the cross sections of the air outlet section and the flared guide section are circular, and the outer end of the air outlet section is connected with the end opening of the heat exchange air duct for blowing out cold air flow. The outer tube comprises a first fitting section, a second fitting section, and a vertical ring plate section connecting the first fitting section and the second fitting section; the first fitting section penetrates the space wall of the cooled space or the heated space; An inner end of the second fitting section extends inwardly to form a flange, and the vertical ring plate section, the second fitting section, and the flange define a water storage cavity; Part or all of the air outlet section is arranged on the inner side of the first fitting section, and part or all of the flared guide section is arranged on the inner side of the second fitting section; the diameter of the opening edge of the flared guide section is greater than the diameter of the edge of the flange.

8. The air conditioner according to claim 7, wherein An outer end of the outer tube is sealingly connected to an outer end of the air outlet section; The air conditioner further comprises: An atomization device for atomizing water in the water storage cavity; A connecting tube, one end of which is in communication with the first fitting section to be in communication with the water storage cavity through the outer tube, and the connecting tube guides the atomized condensed water into the heat exchange air duct and to the air inlet side of the heat exchanger in the refrigeration mode; A water level detection device for detecting the water level in the water storage cavity to start the atomization device according to the water level in the water storage cavity.

Images