Indoor unit of air conditioner

Abstract

The invention discloses an air conditioner indoor unit, and belongs to the technical field of air conditioners. The indoor unit of the air conditioner comprises a machine shell, an air inlet and an air outlet, the heat exchanger is connected to the interior of the machine shell, an air inlet cavity is formed by an inner space defined by the heat exchanger, an air outlet cavity is formed by a space between the outer side of the heat exchanger and the machine shell, the air inlet cavity is communicated with the air inlet, and the air outlet cavity is communicated with the air outlet; the fan is arranged in the air inlet cavity corresponding to the air inlet; the air inlet and the air outlet are formed in different walls of the machine shell. The air conditioner indoor unit can avoid return air short circuit and improve the air supply distance.

Description

TECHNICAL FIELD

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

[0002] At present, the return air inlets and four air outlets of the existing four-direction indoor unit are in one plane dimension, which causes the return air flow and the outlet air flow to interfere with each other, and the return air flow negative pressure is greater than the outlet air flow dynamic pressure to a great extent, so that the outlet air flow directly flows back along the return air inlet, causing return air short circuit and affecting the air supply distance. SUMMARY

[0003] The present application provides an air conditioner indoor unit, which can avoid return air short circuit and improve the air supply distance.

[0004] In one aspect of the present application, an air conditioner indoor unit comprises: a casing, which is provided with an air inlet and an air outlet; a heat exchanger, which is connected in the casing, an internal space surrounded by the heat exchanger forming an air inlet chamber, and a space between the outer side of the heat exchanger and the casing forming an air outlet chamber, the air inlet chamber being in communication with the air inlet, and the air outlet chamber being in communication with the air outlet; and a fan, which is arranged in the air inlet chamber corresponding to the air inlet; wherein the air inlet and the air outlet are arranged on different walls of the casing.

[0005] By arranging the air inlet 16 and the air outlet 17 on different walls of the casing 10, the distance between the air inlet 16 and the air outlet 17 is increased, return air short circuit is avoided, and the air supply distance is prolonged.

[0006] In some embodiments, the fan comprises a fan; the fan outer diameter D of the fan and the air outlet height H1 of the fan satisfy: 0.19*D≤H1≤0.24*D. The performance of the fan can be ensured, and the influence of the size of the fan on the size of the indoor unit is avoided.

[0007] In some embodiments, the fan comprises: a fan; and a flow guide ring, which is connected between the air inlet and the air inlet end of the fan;

[0008] The distance from the upper disc of the fan to the air inlet end surface of the flow guide ring is L, and the height of the heat exchanger is H, and H / 4≤L≤H / 2. The flow loss caused by vortex and fin noise can be avoided.

[0009] In some embodiments, the fan comprises: a fan; and a flow guide ring, which is connected between the air inlet and the air inlet end of the fan;

[0010] The distance from the upper disc of the fan to the air inlet end surface of the flow guide ring is L, and the circular arc radius of the flow guide ring is R1, and L / 2≤R1≤3L / 4. The air inlet flow can be smooth, and the gap backflow between the flow guide ring 53 and the heat exchanger 20 can be reduced.

[0011] In some embodiments, the fan includes: a fan; and a guide ring connected between the air inlet and the air inlet end of the fan.

[0012] The radius of the guide ring is R1, the radius of the upper fan disc is R2, the distance from the center of R1 to the heat exchanger is L1, and the distance from the center of R2 to the heat exchanger is L2; ​​0.6≤L1 / L2≤0.8. This can increase the airflow.

[0013] In some embodiments, it further includes: a water receiving tray disposed below the heat exchanger for collecting condensate on the heat exchanger;

[0014] The fan is connected to the water collection tray.

[0015] In some embodiments, the water receiving tray includes a support portion located in the middle and a water receiving trough located at the edge; the fan is connected to the support portion, and the bottom end of the heat exchanger is located in the water receiving trough.

[0016] In some embodiments, the support is closed to seal the bottom of the air inlet cavity.

[0017] In some embodiments, a light fixture is attached to the bottom surface of the housing.

[0018] In another aspect of this application, an indoor air conditioning unit includes: a casing having an air inlet and an air outlet thereon; a heat exchanger connected inside the casing, the internal space enclosed by the heat exchanger forming an air inlet cavity, the space between the outer side of the heat exchanger and the casing forming an air outlet cavity, the air inlet cavity communicating with the air inlet, and the air outlet cavity communicating with the air outlet; and a fan disposed inside the air inlet cavity corresponding to the air inlet; wherein the air inlet is disposed on the top wall of the casing, and the air outlet is disposed on the side wall or bottom wall of the casing; or, the air inlet is disposed on the bottom wall of the casing, and the air outlet is disposed on the side wall of the casing. Attached Figure Description

[0019] Figure 1 A perspective view of an indoor air conditioning unit according to some embodiments is shown;

[0020] Figure 2 A perspective view of an indoor air conditioning unit according to some embodiments is shown from another angle;

[0021] Figure 3 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 1 ;

[0022] Figure 4 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 2 ;

[0023] Figure 5 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 3 ;

[0024] Figure 6 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 4 ;

[0025] Figure 7 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 5 ;

[0026] Figure 8 A bottom view of a prior art air conditioner indoor unit is shown;

[0027] Figure 9 A cross-sectional view of a prior art air conditioning indoor unit is shown;

[0028] In the above figures, 10 is the casing; 11 is the top wall; 12 is the bottom wall; 13 is the side wall; 14 is the upper shell; 15 is the chassis; 16 is the air inlet; 17 is the air outlet; 20 is the heat exchanger; 31 is the air inlet cavity; 32 is the air outlet cavity; 41 is the air guide plate; 42 is the auxiliary oscillating blade; 50 is the fan; 51 is the fan; 511 is the lower impeller; 512 is the blade; 513 is the upper impeller; 52 is the motor; 53 is the guide ring; 60 is the water receiving tray; 61 is the support part; and 62 is the water receiving trough. Detailed Implementation

[0029] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Air conditioners execute a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle involves a series of processes including compression, condensation, expansion, and evaporation, supplying refrigerant to the conditioned and heat-exchanged air.

[0034] The compressor compresses refrigerant gas at a low temperature and low pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0035] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0036] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0037] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0038] Reference Figures 1 to 3 An indoor air conditioning unit according to an embodiment of this application includes a housing 10. The housing 10 forms the general appearance of the indoor air conditioning unit.

[0039] The housing 10 has a top wall 11, a bottom wall 12 and a side wall 13 connecting the top wall 11 and the bottom wall 12.

[0040] The housing 10 includes an upper housing 14 and a chassis 15. The upper housing 10 is box-shaped with an open bottom, and the chassis 15 is connected to the bottom of the upper housing 10.

[0041] The top wall of the upper shell 14 is the top wall 11 of the housing 10, and the side walls of the upper shell 14 are the side walls 13 of the housing 10. The chassis 15 forms the bottom wall 12 of the housing 10.

[0042] The housing 10 is provided with an air inlet 16 and an air outlet 17. Indoor air enters the housing 10 through the air inlet 16; air inside the housing 10 is discharged into the indoor space through the air outlet 17.

[0043] In the prior art, referring to Figure 8 and Figure 9 On an indoor unit of an air conditioner with four-way airflow, the air inlet 16 and the air outlet 17 are usually located on the bottom wall 12 of the casing 10. The air inlet 16 is located in the center of the bottom wall 12, and an air outlet 17 is located in each of the four directions around the outer periphery of the air inlet 16, thus forming four-way airflow.

[0044] In the existing air supply method of bottom return and bottom outlet, since the air inlet 16 and the air outlet 17 are located on the same plane dimension, the distance between the return air and the outlet air is relatively short. As a result, part of the airflow blown out of the outlet 17 will directly re-enter the casing 10 through the air inlet 16, causing a short circuit in the return air. The loss of flow will also affect the air supply distance.

[0045] To address the issues of short-circuited return air and short air supply distance, in the embodiments of this application, the air inlet 16 and the air outlet 17 are located on different walls of the casing.

[0046] Since the air inlet 16 and the air outlet 17 are located on different walls of the housing 10, the distance between the air inlet 16 and the air outlet 17 is increased, avoiding short-circuiting of the return air and extending the air delivery distance.

[0047] In some embodiments, the air inlet 16 is located on the top wall 11 of the housing 10, and the air outlet 17 is located on the bottom wall of the housing 10, so as to realize the air supply method of top return and bottom supply. This type of air supply is more suitable for ceiling-mounted indoor units.

[0048] The following table shows a comparative experiment between the existing indoor unit with bottom return and bottom air outlet and the indoor unit with top return and bottom air outlet of this application:

[0049] Return air mode Return air short circuit Air volume m 3 / h]] Supply air distance L (m) Noise dB Lower return air Yes 2050 4.2 (0.3 m / s) 51.5 Upper return air No 2200 5 (0.3 m / s) 48.5

[0050] This application adopts an upward return air configuration, in which the air inlet 16 and the air outlet 17 are located at the upper and lower ends of the machine in the height direction, respectively, which avoids the occurrence of return air short circuit, increases the air supply volume by 7.3%, and extends the air supply distance by 0.8m; since the return air noise is isolated, the noise is reduced by 3dB.

[0051] In addition, the top return air layout makes full use of the strong bottom work capacity of the fan, improves the uneven heat exchange at the bottom of the heat exchanger 20, and greatly improves the heat exchange performance of the heat exchanger 20.

[0052] In other embodiments, the air inlet 16 may be disposed on the top wall 11 of the housing 10, and the air outlet 17 may be disposed on the side wall 13 of the housing 10; or the air inlet 16 may be disposed on the bottom wall of the housing 10, and the air outlet 17 may be disposed on the side wall of the housing 10.

[0053] According to the embodiment of the application, at least a portion of the top wall 11 is opened to form an air inlet 16, and an air inlet grille may be provided at the air inlet 16 to prevent the introduction of foreign objects. The chassis 15 is opened in four directions to form four air outlets 17.

[0054] Specific reference Figure 3 The indoor unit of the air conditioner may include an air guide plate 41 for opening / closing the air outlet 17. The air guide plate 41 is rotatably mounted on the housing 10.

[0055] The air guide plate 41 can move between a closed position and an open position, wherein in the closed position the air outlet 17 is closed by the air guide plate 41, and in the open position the air outlet 17 is open and the direction of air discharged from the air outlet 17 into the indoor space is guided by the air guide plate 41.

[0056] The indoor unit of the air conditioner may include auxiliary sway vanes 42. The auxiliary sway vanes 42 are used to control the direction of the air discharged from the air outlet 17. The air guide vane 41 can control the air blown out vertically, and the auxiliary sway vanes 42 can control the air blown out horizontally.

[0057] Multiple auxiliary blades 42 are spaced apart from each other by a predetermined distance in the horizontal direction. The auxiliary blades 42 may be disposed inside the air guide plate 41 so as not to be exposed to the outside when the air guide plate 41 is in the closed position.

[0058] The indoor unit of the air conditioner includes a heat exchanger 20 for absorbing heat from or transferring heat to the air introduced into the air inlet 16.

[0059] The heat exchanger 20 is arranged in a ring shape and is vertically installed inside the casing 10. The space enclosed by the inner ring (i.e., the inner side) of the heat exchanger 20 is the air inlet cavity 31, which is connected to the air inlet 16; the space enclosed by the outer ring (i.e., the outer side) of the heat exchanger 20 and the casing 10 is the air outlet cavity 32, which is connected to the air outlet 17.

[0060] On the projection of the top wall 11 of the casing 10, the air inlet 16 and the air inlet cavity 31 are located inside the heat exchanger 20, and the air outlet cavity 32 is located outside the heat exchanger 20.

[0061] The heat exchanger 20 can be a finned heat exchanger, specifically including refrigerant pipes arranged in an S-shape and fins running through the refrigerant pipes. The refrigerant pipes are connected to the refrigerant pipes of the heat exchanger of the outdoor unit through pipelines. They are mainly used to circulate refrigerant. The heat on the refrigerant pipes will be transferred to the fins, and the fins are mainly used to exchange heat with the air passing through them.

[0062] The indoor unit of the air conditioner includes a fan 50. The fan 50 is located inside the air inlet cavity 31 corresponding to the air inlet 16. The fan 50 is used to drive airflow, so that indoor air can flow from the air inlet 16 to the air outlet 17.

[0063] The fan 50 includes a fan 51. The fan 51 is driven by a motor 52 to rotate, thereby generating airflow.

[0064] Fan 51 can be a backward centrifugal fan that draws air in axially and throws it out radially.

[0065] The fan 51 includes a lower disk 511. The lower disk 511 may be cap-shaped, with its center recessed upwards to form a mounting cavity. The motor 52 is located within the mounting cavity and is connected to the center of the lower disk 511 to drive the lower disk 511 to rotate.

[0066] Multiple blades 512 are arranged on the outer periphery of the mounting cavity on the lower wheel 511. The multiple blades 512 are arranged at intervals along the circumferential direction.

[0067] The fan 51 includes an upper impeller 512. The upper impeller 512 may be trumpet-shaped. The diameter of the upper impeller 512 gradually increases along the air intake direction. The upper impeller 512 is connected to the outer ring of the upper end of the blades 512 to fix the upper end of the blades 512 and form the air intake end of the fan 51.

[0068] The fan 50 includes a guide ring 53. The guide ring 53 is trumpet-shaped, and its inner diameter gradually decreases along the air inlet direction. The guide ring 53 is connected between the air inlet 16 and the upper impeller 511.

[0069] After changing the air inlet 16 from the bottom wall 12 to the top wall 11, the fan 50 also rotates 180° relative to the prior art, that is, the air inlet end of the fan 50 faces the upper air inlet 16, and the motor 52 is located below the fan 51.

[0070] The indoor unit of the air conditioner includes a drip tray 60. The drip tray 60 may be located below the heat exchanger 20 to collect the water condensed in the heat exchanger 20.

[0071] The water collection tray 60 can be connected to the upper shell 14. When the air outlet 17 is set on the chassis 15, the water collection tray 60 is opened through the air outlet 17 to allow the air outlet cavity 32 to communicate with the air outlet 17.

[0072] In some embodiments, the water receiving tray 60 includes a supporting portion 61 located in the middle. The supporting portion 61 can be in the shape of a plate, and the bottom of the motor 52 can be connected to the supporting portion 61 by screws.

[0073] A water receiving groove 62 that is recessed downward is provided at a position near the edge of the upper end surface of the water receiving tray 60. The bottom end of the heat exchanger 20 is located in the water receiving groove 62.

[0074] The water receiving groove 62 is flared from bottom to top. In this way, the blockage of the bottom of the heat exchanger 20 by the water receiving tray 60 can be reduced, and the air flow can more easily flow to the bottom of the heat exchanger 20, so as to give full play to the heat exchange function at the bottom of the heat exchanger 20 and improve the working efficiency of the heat exchanger 20.

[0075] In some embodiments, a lighting fixture can be provided in the middle of the lower surface of the chassis 15, which can play a lighting role, bring a visual impact, and improve the aesthetics.

[0076] Refer to Figure 4 , define the outer diameter of the lower wheel disc 511 of the fan 51 as the fan outer diameter D. The fan outlet height H1 refers to the axial height of the upper wheel disc 513 and the lower wheel disc 511 of the fan 51 on the outlet side.

[0077] In some embodiments, the relationship between the fan outer diameter D and the fan outlet height H1 satisfies: 0.19*D ≤ H1. If H1 < 0.19*D, then the axial height of the fan is relatively small, and the working ability of the fan will be insufficient.

[0078] The relationship between the fan outer diameter D and the fan outlet height H1 satisfies: H1 ≤ 0.24*D. If H1 > 0.24*D, then the axial height of the fan is relatively large. On the one hand, it will increase the size of the fan, resulting in an increase in the height dimension of the air conditioner indoor unit; on the other hand, the axial height of the fan is relatively large, resulting in a relatively large pressure gradient difference, and thus the fan performance will decline.

[0079] In this application, setting 0.19*D ≤ H1 ≤ 0.24*D can ensure that the working ability and performance of the fan will not be reduced, and at the same time avoid the influence of the increase in the fan size on the external dimensions of the indoor unit.

[0080] In some embodiments, define the axial distance from the upper wheel disc 513 to the inlet end of the guide ring 53 as L.

[0081] The relationship between the height H of the heat exchanger 20 and the distance L satisfies: H / 4 ≤ L. If L < H / 4, at this time the fan outlet range corresponds to the middle and upper parts of the heat exchanger 20, which easily causes eddy currents in the middle and lower parts of the heat exchanger 20, resulting in flow loss.

[0082] The relationship between the height H and the distance L of the heat exchanger 20 satisfies: L ≤ H / 2. If L > H / 2, at this time, the air outlet range of the fan corresponds to the middle and lower parts of the heat exchanger 20. Since the bottom of the fan has strong working ability, it will cause a cross-blow phenomenon between the air flow and the windward surface of the heat exchanger 20, and there is a risk of air outlet fin noise.

[0083] In this application, setting H / 4 ≤ L ≤ H / 2 can avoid the flow loss caused by eddy currents and fin noise.

[0084] In some embodiments, the longitudinal section of the guide ring 53 is arc-shaped, and the arc radius of the guide ring 53 is R1.

[0085] The relationship between the radius R1 and the distance L satisfies: L / 2 ≤ R1. Since the larger the arc radius R1 of the guide ring 53, the smoother the incoming air flow. If R1 < L / 2, then R1 is relatively small, which will affect the smoothness of the incoming air flow.

[0086] The relationship between the radius R1 and the distance L satisfies: R1 ≤ 3L / 4. If R1 > 3L / 4, it will increase the gap backflow between the guide ring 53 and the heat exchanger 20.

[0087] In this application, setting L / 2 ≤ R1 ≤ 3L / 4 can ensure the smooth incoming air flow within this range and reduce the gap backflow between the guide ring 53 and the heat exchanger 20. The backflow rate can be reduced from 3% to 1%.

[0088] In some embodiments, the distance between the center of the arc radius R1 of the guide ring 53 and the heat exchanger 20 is L1.

[0089] The longitudinal section of the upper wheel disc 513 is arc-shaped, the arc radius of the upper wheel disc 513 is R2, and the distance between the center of R2 and the heat exchanger 20 is L2.

[0090] The relationship between the distance L1 and the distance L2 satisfies: 0.6 ≤ L1 / L2 ≤ 0.8. Within this value range, the high-speed air flow at the air outlet of the fan will have a certain drainage effect on the low-speed air flow in the upper part, and the air volume can be increased by 6% at the same rotation speed.

[0091] As described above, the air conditioner indoor unit of this application sets the air inlet 16 and the air outlet 17 on different walls of the casing 10, increasing the distance between the air inlet 16 and the air outlet 17, avoiding return air short circuit, and extending the air supply distance.

[0092] The air conditioner indoor unit of this application adopts the upper return air form, where the air inlet 16 and the air outlet 17 are respectively located at the upper end and the lower end in the height direction of the machine, avoiding the occurrence of return air short circuit, improving the air supply distance, and reducing the return air noise.

[0093] The indoor unit of the air conditioner in this application adopts a top return air layout, which makes full use of the strong bottom working capacity of the fan, improves the uneven heat exchange at the bottom of the heat exchanger 20, and greatly improves the heat exchange performance of the heat exchanger 20.

[0094] The air conditioner indoor unit of this application can ensure that the working capacity and performance of the fan will not be reduced by setting the relationship between the outer diameter D of the fan and the air outlet height H1, while avoiding the impact of increasing the size of the fan on the external dimensions of the indoor unit.

[0095] The air conditioner indoor unit of this application can avoid flow loss caused by eddies and fin noise by setting the relationship between the height H and distance L of the heat exchanger 20.

[0096] The indoor unit of the air conditioner in this application is set according to the relationship between the arc radius R1 of the guide ring 53 and the distance L, which can not only ensure smooth air intake, but also reduce backflow between the guide ring 53 and the heat exchanger 20.

[0097] The air conditioning indoor unit of this application can increase air volume by setting the relationship between distance L1 and distance L2.

[0098] Finally, it should be noted that 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. Such 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.

[0099] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. An indoor unit for an air conditioner, characterized in that, include: The casing has an air inlet and an air outlet. A heat exchanger is connected inside the housing. The internal space enclosed by the heat exchanger forms an air inlet chamber, and the space between the outer side of the heat exchanger and the housing forms an air outlet chamber. The air inlet chamber is connected to the air inlet, and the air outlet chamber is connected to the air outlet. as well as A fan is disposed inside the air inlet cavity, corresponding to the air inlet. The air inlet and the air outlet are located on different walls of the housing.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The fan includes a fan; The outer diameter D of the fan and the outlet height H1 of the fan satisfy the following condition: 0.19*D≤H1≤0.24*D.

3. The indoor unit of the air conditioner according to claim 1, characterized in that, The fan includes: fan; A guide ring is connected between the air inlet and the air intake end of the fan; The distance from the upper disc of the fan to the air inlet end face of the guide ring is L, and the height of the heat exchanger is H, where H / 4≤L≤H / 2.

4. The indoor unit of the air conditioner according to claim 1, characterized in that, The fan includes: fan; A guide ring is connected between the air inlet and the air intake end of the fan; The distance from the upper disc of the fan to the air inlet end face of the guide ring is L, and the radius of the arc of the guide ring is R1, where L / 2≤R1≤3L / 4.

5. The indoor unit of the air conditioner according to claim 1, characterized in that, The fan includes: fan; A guide ring is connected between the air inlet and the air intake end of the fan; The radius of the guide ring is R1, the radius of the upper disc of the fan is R2, the distance from the center of R1 to the heat exchanger is L1, and the distance from the center of R2 to the heat exchanger is L2; ​​0.6≤L1 / L2≤0.

8.

6. The indoor unit of the air conditioner according to claim 1, characterized in that, Also includes: A drip tray, located below the heat exchanger, is used to collect condensate from the heat exchanger. The fan is connected to the water receiving tray.

7. The indoor unit of the air conditioner according to claim 6, characterized in that, The water receiving tray includes a support part located in the middle and a water receiving trough located at the edge; the fan is connected to the support part, and the bottom end of the heat exchanger is located in the water receiving trough.

8. The indoor unit of the air conditioner according to claim 7, characterized in that, The support portion is enclosed to seal the bottom of the air inlet cavity.

9. The indoor unit of the air conditioner according to claim 1, characterized in that, The bottom surface of the casing is connected to a light fixture.

10. An indoor unit for an air conditioner, characterized in that, include: The casing has an air inlet and an air outlet. A heat exchanger is connected inside the housing. The internal space enclosed by the heat exchanger forms an air inlet chamber, and the space between the outer side of the heat exchanger and the housing forms an air outlet chamber. The air inlet chamber is connected to the air inlet, and the air outlet chamber is connected to the air outlet. as well as A fan is disposed inside the air inlet cavity, corresponding to the air inlet. The air inlet is located on the top wall of the housing, and the air outlet is located on the side wall or bottom wall of the housing. Alternatively, the air inlet is located on the bottom wall of the housing, and the air outlet is located on the side wall of the housing.

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