Air conditioner indoor unit and air conditioning system

Abstract

The embodiment of the utility model provides an air conditioner indoor unit and an air conditioning system. The air conditioner indoor unit comprises a machine shell, an evaporator and a cross-flow fan. The machine shell is provided with an air inlet, an air outlet and an air supply channel communicated with the air inlet and the air outlet, the air outlet is formed above the air inlet, a volute tongue extending towards the interior of the air supply channel is arranged in the area, close to the air outlet, of the machine shell, and a drainage groove is formed in the volute tongue; the evaporator and the cross-flow fan are both arranged in the air supply channel, the evaporator is obliquely arranged in the direction close to the air outlet from top to bottom, and the lower edge of the evaporator is arranged above the drainage groove. The drainage groove is formed in the volute tongue, so that the problem that airflow flowing is blocked due to the fact that a drainage disc is directly and additionally arranged in the air supply channel is solved. Therefore, the air conditioner indoor unit has the advantages of reducing air resistance and improving air supply efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technical field, concretely relates to an air conditioner indoor unit and air conditioning system with the air conditioner indoor unit. BACKGROUND

[0002] In the related art, a water receiving tray is additionally arranged in the air supply channel of the air conditioner indoor unit to drain condensed water, in order to ensure the reliability of water receiving, a water receiving tray with sufficient width is arranged, and the water receiving tray is arranged below the evaporator and above the air inlet, the airflow entering the air supply channel from the air inlet needs to bypass the water receiving tray to pass through the evaporator to complete heat exchange operation, the water receiving tray blocks the air inlet, and the air resistance is too large and the air supply efficiency is low. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the related art is solved to some extent.

[0004] The utility model discloses an air conditioning system.

[0005] The air conditioner indoor unit of the utility model embodiment comprises a shell, an evaporator and a cross-flow fan.

[0006] The shell has an air inlet, an air outlet and an air supply channel connecting the air inlet and the air outlet, and the air outlet is arranged above the air inlet, a volute tongue extending towards the inside of the air supply channel is arranged in the area of the shell close to the air outlet, and a drainage groove is arranged on the volute tongue.

[0007] The air conditioner indoor unit of the utility model embodiment can increase the length of the air supply channel by arranging the volute tongue extending towards the inside of the air supply channel, thereby increasing the travel of airflow in the air supply channel and improving the heat exchange efficiency.

[0008] The air conditioner indoor unit of the utility model embodiment has the advantages of reducing air resistance and improving air supply efficiency.

[0009] In some embodiments, the volute tongue has a bend and is sequentially and smoothly connected to an air outlet side wall surface, a bend surface and an air guide side wall surface, the end of each of the air outlet side wall surface and the air guide side wall surface is connected to the inner wall surface of the cabinet, the air guide side wall surface is arranged towards the cross-flow fan and above the cross-flow fan, the air outlet side wall surface has a lower groove, and the lower groove forms the drain groove.

[0010] In other embodiments, the air conditioner indoor unit further comprises a drain tray, the drain tray is embedded in the lower groove, and the drain tray has the drain groove.

[0011] In some embodiments, in the cross section perpendicular to the length direction of the cabinet, the air outlet side wall surface and the air guide side wall surface are straight surfaces, and the included angle between the air outlet side wall surface and the air guide side wall surface is α, 40°≤α≤55°.

[0012] In some embodiments, in the cross section perpendicular to the length direction of the cabinet, the distance between the cross-flow fan and the air guide side wall surface is a volute tongue gap ε1, 4mm≤ε1≤6mm.

[0013] In some embodiments, the distance between the air guide side wall surface and the air inlet is L3, 120mm≤L3≤140mm.

[0014] In some embodiments, in the front-rear direction of the cabinet, the distance between the lower edge of the evaporator and the lower edge of the air outlet is L1, 45mm≤L1≤65mm.

[0015] In some embodiments, in the front-rear direction of the cabinet, the minimum distance between the upper edge of the evaporator and the upper edge of the air outlet is L2, 100mm≤L2≤140mm.

[0016] In some embodiments, in the height direction of the cabinet, the distance between the lower edge of the evaporator and the center of the cross-flow fan is H1, 100mm≤H1≤120mm; and / or, the diameter of the cross-flow fan is D1, 94mm≤D1≤120mm.

[0017] In some embodiments, the cabinet comprises a base and a front panel connected, the air supply channel is formed between the base and the front panel, the air outlet is formed between the upper edge of the front panel and the base, the air inlet is formed on the lower end surface of the base, the volute tongue is formed or connected to the inner wall surface of the front panel near the upper edge, and the front panel extends in the direction from top to bottom and is arranged with a backward inclination.

[0018] In some embodiments, the height of the front panel is L4, 230mm≤L4≤260mm.

[0019] In some embodiments, a section of the base close to the air inlet has a guide curve extending towards a rear-to-front direction, and a minimum distance between an outer edge of the cross-flow fan and the guide curve of the base is a volute throat gap ε2, 5mm≤ε2≤7mm.

[0020] In some embodiments, the air conditioner indoor unit further comprises a heating element, the cross-flow fan is arranged close to the air inlet, the evaporator is arranged close to the air outlet, and the heating element is arranged between the evaporator and the cross-flow fan in the extension direction of the air supply channel.

[0021] In some embodiments, in the height direction of the cabinet, a minimum distance between an outer edge of the heating element and an outer edge of the cross-flow fan is L5, 55mm≤L5≤75mm.

[0022] The air conditioner system of the embodiments of the present application comprises the air conditioner indoor unit according to any one of the above. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a cross-sectional schematic view of the embodiments of the present application.

[0024] Reference signs:

[0025] Base 11; front panel 12; air inlet 101; air outlet 102;

[0026] Volute tongue 2; air outlet side wall surface 21; bent surface 22; air guide side wall surface 23; drain groove 24;

[0027] Evaporator 3;

[0028] Cross-flow fan 4;

[0029] Heating element 5. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0031] The embodiments of the present application are described below with reference to Figure 1 The air conditioner indoor unit and the air conditioner system of the embodiments of the present application are described.

[0032] The air conditioner indoor unit of the embodiments of the present application comprises a cabinet, an evaporator 3 and a cross-flow fan 4.

[0033] The casing has an air inlet 101, an air outlet 102, and an air supply channel connecting the air inlet 101 and the air outlet 102. The air outlet 102 is located above the air inlet 101. A volute 2 extending into the air supply channel is provided in the area of ​​the casing near the air outlet 102, and a drain groove 24 is provided on the volute 2. The evaporator 3 and the cross-flow fan 4 are both located within the air supply channel. The evaporator 3 is arranged inclined from top to bottom towards the air outlet 102, and its lower edge is located above the drain groove 24. It is understood that the opening of the drain groove 24 faces upwards.

[0034] The indoor unit of this air conditioner, by providing a volute 2 extending into the air supply duct, increases the length of the air supply duct, thereby increasing the travel distance of the airflow within the duct and improving heat exchange efficiency. Furthermore, by placing the drain groove 24 on the volute 2, the problem of obstructing airflow caused by directly placing an additional drain tray on top of the existing drain pan is avoided. This application directly places the drain groove 24 on the volute 2, which helps reduce wind resistance within the air supply duct, increases the effective air supply cross-sectional area, and thus effectively improves the air intake and air supply efficiency. Therefore, the increased air intake and air supply efficiency enhance the heat exchange effect of the indoor unit. Consequently, this indoor unit improves user comfort.

[0035] The indoor unit of the air conditioner in this embodiment of the utility model has the advantages of reducing wind resistance and improving air delivery efficiency.

[0036] like Figure 1 As shown, the volute 2 has a curved and smoothly connected air outlet side wall 21, a curved surface 22, and an air guide side wall 23. The ends of each of the air outlet side wall 21 and the air guide side wall 23 (the front ends of the air outlet side wall 21 and the air guide side wall 23) are connected to the inner wall of the casing. The air guide side wall 23 is positioned facing the cross-flow fan 4 and is located above the cross-flow fan 4. The air outlet side wall 21 has a lower groove, which forms a drainage groove 24 extending along the length of the casing. It can be understood that, in the vertical direction, the drainage groove 24 is located between the cross-flow fan 4 and the evaporator 3. The drainage groove 24 mates with the lower edge of the air outlet 102. The air outlet side wall 21, the curved surface 22, and the air guide side wall 23 constitute the outer wall of the volute 2.

[0037] In this embodiment of the air conditioner indoor unit, the air-side wall, bending surface 22, and air-guiding side wall 23 of the volute 2 are smoothly connected, which improves the air guiding capacity of the volute 2, improves the convection environment of the airflow at the volute 2, and avoids problems such as uneven airflow and airflow surge. Furthermore, this embodiment of the air conditioner indoor unit effectively reduces the noise and wind resistance generated during operation, and improves its own airflow capacity.

[0038] In addition, the drainage groove 24 is formed by the lower recess of the volute tongue 2, and a separate drainage tray is no longer needed. Furthermore, the assembly steps of the air conditioner indoor unit are simplified. Therefore, the air conditioner indoor unit has the advantages of improving the assembly efficiency.

[0039] The embodiments of the utility model are not limited to this, for example, in other embodiments, the utility model embodiment still includes drainage tray, drainage tray is embedded in lower groove, drainage tray has drainage groove 24.

[0040] The air conditioner indoor unit of the utility model embodiment, by embedding the drainage tray with the drainage groove 24 in the lower groove of the volute tongue 2, when cleaning the air conditioner indoor unit later, the drainage tray can be directly disassembled, which helps to improve the convenience of the drainage groove 24 cleaning work.

[0041] In some embodiments, on the cross section perpendicular to the length direction of the shell, the air outlet side wall surface 21 and the air guide side wall surface 23 are both straight surfaces, and the included angle between the air outlet side wall surface 21 and the air guide side wall surface 23 is α, 40°≤α≤55°. Specifically, the included angle between the outer wall surface of the air outlet side wall surface 21 and the outer wall surface of the air guide side wall surface 23 is α. Alternatively, the included angle α between the air outlet side wall surface 21 and the air guide side wall surface 23 can be 40°, 42°, 44°, 45°, 46°, 48°, 50°, 52°, 53°, 54° and 55°, etc.

[0042] The air conditioner indoor unit of the utility model embodiment, by limiting the range of the included angle α between the air outlet side wall surface 21 and the air guide side wall surface 23, on the one hand, it avoids the problem that the air flow collides at the volute tongue 2 to increase the disturbed airflow due to the too small included angle α, because the disturbed airflow will increase the problems of air outlet surge, noise and air resistance of the air conditioner indoor unit, thereby reducing the overall air supply capacity of the volute tongue 2, so as to ensure the smoothness of the air outlet of the air conditioner indoor unit and reduce the wind noise during operation. On the other hand, it also avoids the problems of high energy loss and turbulence caused by the too large included angle α. Because the included angle α will affect the pressure distribution inside the shell, causing pressure fluctuations at the outlet, thereby causing greater turbulence and instability of the airflow passing through the volute tongue 2, increasing energy loss and sound noise. Therefore, the air conditioner indoor unit of the present application has the advantages of low energy consumption, small surge and low sound noise by limiting the range of the included angle α.

[0043] In some embodiments, on the cross section perpendicular to the length direction of the shell, the distance between the cross-flow fan 4 and the air guide side wall surface 23 is the volute tongue 2 gap ε1, 4mm≤ε1≤6mm. Alternatively, the volute tongue 2 gap ε1 can be 4.0mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5.0mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm and 6.0mm, etc.

[0044] The air conditioner indoor unit of the embodiment of the utility model, through limiting the range of the volute tongue 2 gap epsilon 1, on the one hand, avoid the problem that the volute tongue 2 gap epsilon 1 is too small to cause the wind resistance and the air supply volume to be small, thereby the air conditioner indoor unit of the embodiment of the utility model guarantees the fluency of the air conditioner indoor unit air outlet, on the other hand, also avoid the problem that the gap epsilon 1 is too large to cause the compactness of the air conditioner indoor unit as a whole, therefore, the air conditioner indoor unit of the embodiment of the utility model has the advantages of good compactness and high air outlet fluency.

[0045] As shown in Figure 1 In the front-rear direction of the casing, the minimum distance between the lower edge of the evaporator 3 and the lower edge of the air outlet 102 is L1, and 45mm≤L1≤65mm. Optionally, the minimum distance L1 can be 45mm, 48mm, 50mm, 52mm, 55mm, 58mm, 60mm, 62mm, 64mm and 65mm, etc., for example, L1 can be 55mm.

[0046] The air conditioner indoor unit of the embodiment of the utility model, by limiting the minimum distance between the lower edge of the evaporator 3 and the lower edge of the air outlet 102, the guidance of the air flow can be optimized, because the evaporator 3 needs to be arranged above the volute tongue 2 drain groove 24, and the volute tongue 2 has an air outlet side wall surface 21. Therefore, on the one hand, the problem that the lower edge of the evaporator 3 is too small from the air outlet 102 distance L1, affecting the guidance of the air flow is avoided, on the other hand, the problem that the lower edge of the evaporator 3 is too large from the air outlet 102 distance L1, causing the size of the evaporator 3 to be reduced or the inclination angle of the evaporator 3 to be too large, thereby affecting the air outlet temperature control effect of the air conditioner indoor unit is avoided. Therefore, the air conditioner indoor unit of the embodiment of the utility model can optimize the air flow guidance and improve the temperature control effect.

[0047] As shown in Figure 1 In the height direction of the casing, the distance H1 between the lower edge of the evaporator 3 and the center axis of the cross-flow fan 4 is 100mm≤H1≤120mm. Optionally, H1 can be 100mm, 102mm, 104mm, 106mm, 108mm, 110mm, 112mm, 114mm, 116mm, 118mm and 120mm.

[0048] The air conditioner indoor unit of the embodiment of the utility model, by limiting the distance H1 between the lower edge of the evaporator 3 and the center of the cross-flow fan 4, the problem that the distance H1 is too large to cause the air conditioner indoor unit to be poor in compactness is avoided, and the problem that the distance H1 is too small to cause the air flow to be blocked and the air flow temperature uniformity to be poor is also avoided. Therefore, the air conditioner indoor unit of the embodiment of the utility model has the advantages of high compactness and good air flow temperature uniformity.

[0049] As shown in Figure 1As shown, the diameter D1 of the cross-flow fan 4 is 94mm≤D1≤120mm. Alternatively, the diameter D1 of the cross-flow fan 4 can be 94mm, 96mm, 98mm, 100mm, 102mm, 104mm, 106mm, 108mm, 110mm, 112mm, 114mm, 116mm, 118mm and 120mm.

[0050] The air conditioner indoor unit of the embodiment of the utility model avoids the problem that the diameter D1 of the cross-flow fan 4 is too large to affect the overall compactness of the air conditioner indoor unit, and also avoids the problem that the diameter D1 of the cross-flow fan 4 is too small to cause small air supply volume and poor temperature control effect. Therefore, the air conditioner indoor unit helps to reduce the overall size of the air conditioner indoor unit under the premise of meeting the air supply airflow.

[0051] The machine shell comprises a base 11 and a front panel 12 connected, an air supply channel is formed between the base 11 and the front panel 12, an air outlet 102 is formed between the upper edge of the front panel 12 and the base 11, an air inlet 101 is formed on the lower end surface of the base 11, a volute tongue 2 is formed or connected on the inner wall surface of the front panel 12 close to the upper edge, and the front panel 12 extends in the direction from top to bottom and is arranged to be inclined backward. Specifically, as shown in the drawings, Figure 1 The front wall surface of the front panel 12 extends in the direction from top to bottom and is arranged to be inclined backward, that is, the front wall surface of the front panel 12 is a slope inclined backward from top to bottom, the upper end of the front wall surface of the front panel 12 is located in front of the lower end of the front wall surface of the front panel 12, and the air outlet 102 faces forward and is located above the front panel 12.

[0052] The air conditioner indoor unit of the embodiment of the utility model arranges the front panel 12 to extend in the direction from top to bottom and to be inclined backward, the front wall surface of the front panel 12 guides the airflow to flow downward along the inclined front wall surface of the front panel 12, the distance of the front wall surface of the front panel 12 to the vertical plane is farther backward as the airflow flows downward, the airflow is more likely to flow downward to the ground, the flow distance of the airflow on the ground is increased, and the function of increasing the air sweeping area is achieved.

[0053] In addition, in the heating mode, the lower side of the air outlet 102 can also be used for the airflow to flow through, so that the temperature of the airflow entering through the air inlet 101 is high, the hot airflow is internally circulated, the heat exchanger can be high-temperature sterilized, and the problem of peculiar smell of the air conditioner indoor unit is avoided.

[0054] In some embodiments, along the height extension direction of the front panel 12, the distance between the lower wall surface of the volute tongue 2 and the air inlet 101 is L3, 120mm≤L3≤140mm. Optionally, the distance between the lower wall surface of the volute tongue 2 and the air inlet 101 can be L3, which can be 120mm, 122mm, 125mm, 128mm, 130mm, 132mm, 134mm, 135mm, 136mm, 138mm and 140mm, etc.

[0055] The air conditioner indoor unit of the embodiment of the utility model, through limiting the distance L3 between the lower wall surface of the volute tongue 2 and the air inlet 101, on the one hand, can avoid that the volute tongue 2 and the air inlet 101 are too small, which may limit the air inlet space, cause the problem of air flow blockage, and cause the problem of air flow reduction. In addition, the small distance L3 also easily causes the problem of large wind noise caused by backflow and vortex phenomenon. On the other hand, avoid the problem of high energy consumption caused by the large distance L3. Because the large distance L3 may cause the air flow to start to diffuse before entering the cabinet, it cannot be concentratedly guided to the volute tongue 2, and then affect the uniformity of the air flow and cause the problem of uneven cooling and heating in the local area. And the larger the distance L3 is, the longer the air flow path is, and the friction resistance and flow loss will also increase, which causes the problem of high energy consumption. Therefore, the air conditioner indoor unit of the embodiment of the utility model has the advantages of low energy consumption and small sound noise.

[0056] As shown in Figure 1 The height of the front panel 12 is L4, 230mm≤L4≤260mm. It can be understood that, along the height extension direction of the front panel 12, the height of the front panel 12 from the air inlet 101 to the air outlet 102 is L4. Optionally, L4 can be 230mm, 232mm, 235mm, 238mm, 240mm, 242mm, 244mm, 246mm, 248mm, 250mm, 252mm, 254mm, 256mm, 258mm and 260mm. For the same reason, the air conditioner indoor unit of the embodiment of the utility model has the advantages of further reducing energy consumption and small sound noise.

[0057] The distance L3 and the distance L4 are arranged in combination, and when the distance L3 and the distance L4 are in the above range. The air conditioner indoor unit of the embodiment of the utility model can further reduce energy consumption and sound noise.

[0058] The base 11 has a guide surface extending from back to front on a section near the air inlet 101. The minimum distance between the outer edge of the cross-flow fan 4 and the guide surface of the base 11 is the throat clearance ε2, where 5mm ≤ ε2 ≤ 7mm. In other words, the front wall of the base 11 near the air inlet 101 has a guide surface extending from back to front. Optionally, the throat clearance ε2 can be 5.0mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6.0mm, 6.2mm, 6.4mm, 6.6mm, 66.8mm, and 7.0mm, etc.

[0059] The indoor unit of this air conditioner, by limiting the range of the volute gap ε2, avoids the problems of high wind resistance and low air volume caused by an excessively small volute gap ε2, while also avoiding the problem of reduced overall compactness of the indoor unit caused by an excessively large volute gap ε2. Therefore, the indoor unit of this air conditioner combines the advantages of good compactness and smooth airflow.

[0060] The indoor unit of the air conditioner in this embodiment of the utility model also includes a heating element 5, a cross-flow fan 4 is arranged near the air inlet 101, and an evaporator 3 is arranged near the air outlet 102. In the extension direction of the air supply channel, the heating element 5 is arranged between the evaporator 3 and the cross-flow fan 4.

[0061] In this embodiment of the air conditioner indoor unit, by placing the evaporator 3 close to the air outlet 102, the cooled air can be directly and quickly delivered, reducing the time the cold air stays inside the air conditioner and thus reducing the chance of heat exchange with the external environment. Therefore, this embodiment of the air conditioner indoor unit helps to reduce heat loss and improve cooling efficiency.

[0062] Furthermore, especially in heating mode, by placing the heating device between the evaporator 3 and the cross-flow fan 4, the heating device can preheat the air before it enters the evaporator 3. The air will first be heated by the heating device, and then the temperature will be further regulated by the evaporator 3 (which acts as a condenser at this time).

[0063] like Figure 1 As shown, in the height direction of the housing, the minimum distance between the outer edge of the heating element 5 and the outer edge of the cross-flow fan 4 is L5, 55mm≤L5≤75mm.

[0064] The indoor unit of this air conditioner, by limiting the minimum distance between the heating element 5 and the cross-flow fan 4, provides sufficient space for the shaking of both during drops or transportation, effectively preventing deformation caused by collisions between the heating element 5 and the cross-flow fan 4 due to shaking. Therefore, this indoor unit reduces the economic losses incurred during the testing and transportation of prototypes.

[0065] The air conditioning system of the embodiment of the utility model discloses comprises air conditioning outdoor unit and the air conditioning indoor unit of any one above, air conditioning outdoor unit is linked with air conditioning indoor unit.

[0066] The air conditioning system of the embodiment of the utility model has the advantages of reducing wind resistance and improving air supply efficiency.

[0067] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0068] In addition, the terms "first" and "second" are only for the purpose of description, 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" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0069] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0070] In the utility model, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0071] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, in non-contradictory cases, those skilled in the art can combine and combine the features of different embodiments or examples described in the specification.

[0072] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. An indoor unit for an air conditioner, characterized in that, include: The housing has an air inlet, an air outlet, and an air supply channel connecting the air inlet and the air outlet. The air outlet is located above the air inlet. A volute extending toward the interior of the air supply channel is provided in the area of ​​the housing near the air outlet. A drainage groove is provided on the volute. An evaporator and a cross-flow fan are both disposed within the air supply duct, and the evaporator is arranged at an angle from top to bottom toward the air outlet, with the lower edge of the evaporator positioned above the drain trough.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The volute tongue has a curved and smoothly connected air outlet side wall, a curved surface and an air guide side wall. The end of each of the air outlet side wall and the air guide side wall is connected to the inner wall of the housing. The air guide side wall is oriented towards the cross-flow fan and is located above the cross-flow fan. The air outlet side wall has a lower groove, which forms the drainage groove. Alternatively, it may also include a drain tray, which is embedded in the lower groove and has the drain groove.

3. The indoor unit of the air conditioner according to claim 2, characterized in that, In a cross section orthogonal to the length direction of the casing, both the air outlet side wall and the air guide side wall are straight surfaces, and the included angle between the air outlet side wall and the air guide side wall is α, where 40°≤α≤55°; And / or, on a cross section orthogonal to the length direction of the housing, the distance between the cross-flow fan and the air guide side wall is the volute clearance ε1, 4mm≤ε1≤6mm; And / or, the distance between the air guide sidewall and the air inlet is L3, 120mm≤L3≤140mm.

4. The indoor unit of the air conditioner according to claim 1, characterized in that, In the front-rear direction of the housing, the distance between the lower edge of the evaporator and the lower edge of the air outlet is L1, 45mm≤L1≤65mm; And / or, in the front-rear direction of the housing, the minimum distance between the upper edge of the evaporator and the upper edge of the air outlet is L2, 100mm≤L2≤140mm.

5. The indoor unit of the air conditioner according to claim 1, characterized in that, In the height direction of the casing, the distance H1 between the lower edge of the evaporator and the center of the cross-flow fan is 100mm≤H1≤120mm; and / or, the diameter D1 of the cross-flow fan is 94mm≤D1≤120mm.

6. The indoor unit of the air conditioner according to claim 1, characterized in that, The housing includes a connected base and a front panel, the air supply channel is formed between the base and the front panel, the air outlet is formed between the upper edge of the front panel and the base, the air inlet is formed on the lower end surface of the base, the volute is formed or connected to the inner wall surface of the front panel near the upper edge, and the front panel extends from top to bottom and is arranged at a rearward angle.

7. The indoor unit of an air conditioner according to claim 6, characterized in that, The height of the front panel is L4, 230mm≤L4≤260mm; And / or, a section of the base near the air inlet has a guide surface extending in a direction from back to front, and the minimum distance between the outer edge of the cross-flow fan and the guide surface of the base is a volute gap ε2, 5mm≤ε2≤7mm.

8. The indoor unit of an air conditioner according to any one of claims 1-7, characterized in that, It also includes a heating element, with the cross-flow fan positioned near the air inlet and the evaporator positioned near the air outlet. In the extension direction of the air supply channel, the heating element is positioned between the evaporator and the cross-flow fan.

9. The indoor unit of an air conditioner according to claim 8, characterized in that, In the height direction of the housing, the minimum distance between the outer edge of the heating element and the outer edge of the cross-flow fan is L5, 55mm≤L5≤75mm.

10. An air conditioning system, characterized in that, Includes the indoor unit of an air conditioner as described in any one of claims 1-9.

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