Indoor unit of air conditioner

Abstract

The invention discloses an air conditioner indoor unit, and belongs to the technical field of air treatment. The air conditioner indoor unit comprises a machine shell, a heat exchanger and a draught fan. A first air outlet, a second air outlet, a first air duct and a second air duct are formed in the machine shell; a through hole for communicating the inside and the outside is formed in a volute of the fan; the first air duct is communicated between the exhaust outlet and the air outlet of the volute, and the heat exchanger is arranged in the first air duct; the first air duct comprises a first air outlet end corresponding to the first air outlet and a second air outlet end corresponding to the second air outlet; the second air duct extends from one end, communicated with the through hole, of the second air duct to the air outlet; the second air channel comprises a first branch flow channel, a second branch flow channel, a first circulation groove and a second circulation groove. The first circulation groove is communicated with the air outlet end of the first branch flow channel and surrounds the first air outlet end; the second circulation groove is communicated with the air outlet end of the second branch flow channel and surrounds the second air outlet end. The air conditioner indoor unit can prolong the air supply distance.

Description

Technical Field

[0001] This application relates to the field of air handling technology, and more particularly to an indoor air conditioning unit. Background Technology

[0002] Ductless air conditioners have a shorter air delivery distance in their indoor units. Most indoor units deliver air horizontally into the room through the air outlet. When cooling, the short air delivery distance causes the cold air to fall in a concentrated manner, resulting in a concentrated low-temperature area. When heating, the hot air density is low, and the hot air is concentrated in the upper part of the room, causing stratification of hot and cold air, reducing heat transfer efficiency, and affecting the user's comfort.

[0003] Currently, most existing technologies use dual fans or single fans in conjunction with rotating volutes or rigid air guides. Although this can achieve multi-directional airflow, it still cannot solve the problem of short airflow distance. Summary of the Invention

[0004] This application provides an indoor air conditioning unit that extends the air delivery distance while achieving multi-directional air supply.

[0005] In one aspect of this application, an indoor unit for an air conditioner includes: a casing having at least two air outlets, the two air outlets being a first air outlet located on a first side panel of the casing and a second air outlet located on a bottom plate of the casing; a heat exchanger disposed within the casing; a fan disposed on the windward side of the heat exchanger, the fan including a volute, the volute having an exhaust port, and a through opening connecting its interior and exterior; a first air duct connecting the exhaust port and the air outlet of the volute, the heat exchanger being disposed within the first air duct; and a second air duct... A first air duct includes a first air outlet corresponding to a first air outlet and a second air outlet corresponding to a second air outlet; a second air duct, which is independent of the first air duct, extends from the end of the second air duct connected to the through opening to the air outlet; the second air duct includes: a first branch flow channel and a second branch flow channel; a first circulation groove, which is connected to the air outlet end of the first branch flow channel and surrounds the first air outlet end; and a second circulation groove, which is connected to the air outlet end of the second branch flow channel and surrounds the second air outlet end. When the first air outlet is open and the first branch flow channel is connected, the fan runs, causing the air inside the volute to split into two paths: one path flows through the first air channel and out of the first air outlet, and the other path flows through the second air channel and out of the first circulation groove. When the second air outlet is open and the second branch flow channel is connected, the fan runs, causing the air inside the volute to split into two paths: one path flows through the first air channel and out of the second air outlet, and the other path flows through the second air channel and out of the second circulation slot.

[0006] In this technical solution, when the first air outlet is open and the first branch channel is connected, the first and second air ducts generate continuous airflow when the fan is operating. The high-speed airflow in the first air duct changes temperature and becomes low-speed airflow after passing through a heat exchanger, exiting from the first air outlet. Simultaneously, the high-speed airflow in the second air duct, without passing through the heat exchanger, forms a ring-like envelope with the airflow exiting the first air outlet through the first circulation channel. This entrainment effect draws the low-speed airflow that has passed through the heat exchanger, allowing the airflow to cover the indoor space more quickly and increasing the horizontal air delivery range of the indoor unit. During this entrainment process, the high-speed airflow without the heat exchanger mixes with the low-speed airflow that has passed through the heat exchanger, thereby reducing the temperature difference between the air conditioner outlet and the indoor environment and improving the comfort of the airflow.

[0007] Similarly, when the second air outlet is open and the second branch channel is connected, the high-speed airflow in the first air duct changes temperature and becomes low-speed airflow through the heat exchanger, flowing out from the second air outlet. At the same time, the high-speed airflow in the second air duct does not pass through the heat exchanger. The high-speed airflow flowing out from the second annular groove forms an annular wrap around the airflow flowing out from the second air outlet. This causes the high-speed airflow that has not passed through the heat exchanger to be drawn by the low-speed airflow that has passed through the heat exchanger through the entrainment effect, so that the air outlet can cover the indoor space more quickly and increase the downward air delivery range of the indoor air conditioning unit.

[0008] In another aspect of this application, an indoor air conditioning unit includes: a casing having at least two air outlets, the two air outlets being a first air outlet located on a first side panel of the casing and a second air outlet located on a bottom plate of the casing; a heat exchanger disposed within the casing; a fan disposed on the windward side of the heat exchanger, the fan including a volute, the volute having an exhaust port, and a through-hole connecting its interior and exterior; and a main air duct component, the air inlet end of the main air duct component being connected to the volute corresponding to the through-hole, and a main air duct component forming a main air duct. The main flow channel; the air duct forming element, located on the leeward side of the heat exchanger, the air duct forming element having: a ventilation cavity penetrating the air duct forming element and connecting the leeward side of the heat exchanger with the first air outlet; a connecting cavity corresponding to the second air outlet and penetrating the bottom wall of the air duct forming element; a first branch flow channel and a second branch flow channel; a first annular groove, connected to the air outlet end of the first branch flow channel, the first annular groove surrounding the outside of the ventilation cavity; a second annular groove, connected to the air outlet end of the second branch flow channel, the second annular groove surrounding the outside of the connecting cavity; When the first air outlet is open and the first branch flow channel is connected, the fan runs, causing the air inside the volute to split into two paths: one path flows through the heat exchanger and out of the ventilation cavity; the other path flows through the main flow channel and the first branch flow channel and out of the first circulation groove. When the second air outlet is open and the second branch flow channel is connected, the fan runs, causing the air inside the volute to split into two paths: one path flows through the heat exchanger and out of the connecting cavity, and the other path flows through the main flow channel and the second branch flow channel and out of the second circulation groove.

[0009] In this technical solution, when the first air outlet is open and the first branch channel is connected, when the fan is operating, a portion of the high-speed airflow blown out by the fan changes temperature through the heat exchanger and becomes low-speed airflow, flowing out of the ventilation cavity. Simultaneously, another portion of the high-speed airflow blown out by the fan bypasses the heat exchanger, passing through the main channel, the first branch channel, and the first circulation groove. The high-speed airflow flowing out of the first circulation groove envelops the airflow flowing out of the ventilation cavity, causing the high-speed airflow without heat exchanger to draw in the low-speed airflow passing through the heat exchanger through a suction effect. This allows the airflow to cover the indoor space more quickly, increasing the horizontal air delivery range of the indoor air conditioning unit. During the suction process, the high-speed airflow without heat exchanger mixes with the low-speed airflow passing through the heat exchanger, thereby reducing the temperature difference between the air conditioning outlet and the indoor temperature and improving the comfort of the airflow.

[0010] Similarly, when the second air outlet is open and the second branch channel is connected, a portion of the high-speed airflow blown out by the fan changes temperature through the heat exchanger and becomes low-speed airflow, flowing out from the connecting cavity. At the same time, another portion of the high-speed airflow blown out by the fan does not pass through the heat exchanger, but passes through the main channel, the second branch channel, and the second circulation slot. The high-speed airflow flowing out from the second circulation slot envelops the airflow flowing out of the connecting cavity, causing the high-speed airflow that has not passed through the heat exchanger to be drawn by the low-speed airflow that has passed through the heat exchanger through the entrainment effect, so that the air outlet can cover the indoor space more quickly and increase the downward air delivery range of the indoor unit of the air conditioner.

[0011] In some embodiments, the duct forming member includes: a duct branch, the air inlet end of which is connected to the air outlet end of the duct main member, and a first branch flow channel and a second branch upstream flow channel formed on the duct branch; a main duct section connected to the duct branch; a ventilation cavity penetrating the main duct section in a direction perpendicular to the first air outlet, a connecting cavity penetrating the bottom wall of the main duct section, a first annular groove disposed at one end of the main duct section facing the first air outlet, and a second annular groove disposed at the bottom of the main duct section; a second branch downstream flow channel disposed on the side wall of the main duct section and connecting the second branch upstream flow channel and the second annular groove.

[0012] In this technical solution, the machinability of the branch flow channel, the first circulation groove, and the second circulation groove is achieved by setting the air duct forming component.

[0013] In some embodiments, the air duct forming member includes: a protrusion extending downward from the bottom surface of the main air duct portion; a connecting cavity penetrating the protrusion; and a second annular groove recessed upward from the bottom surface of the protrusion.

[0014] In this technical solution, by setting a protrusion at the bottom of the main air duct and setting the second circulation groove on the protrusion, the second circulation groove has a certain depth, which can balance the uniformity of air outlet of each part of the second circulation groove.

[0015] In some embodiments, the duct branch includes: an air inlet main body, the air inlet end of which is connected to the duct main body; a first branch, the air inlet end of which is connected to the air outlet end of the air inlet main body, and the air outlet end of the first branch is connected to the main duct body corresponding to a first circulation groove; a second branch, the air inlet end of which is connected to the air outlet end of the air inlet main body, and the air outlet end of the second branch is connected to the main duct body corresponding to a downstream flow channel of the second branch; the first branch flow channel is disposed on the first branch, and the second branch upstream flow channel is disposed on the second branch.

[0016] In this technical solution, the air duct is branched by setting up an air intake main body, a first branch, and a second branch on the branch section of the air duct.

[0017] In some embodiments, the main air intake branch is inclined along the direction from the air intake end to the air outlet end of the main air intake branch, the first branch is located on the extension line of the main air intake branch, and the second branch extends along the height direction; the angle α between the main air intake branch and the main air intake branch is ≥110°; the angle β between the main air intake branch and the second branch is ≥110°.

[0018] In this technical solution, the angle between the main air duct and the main air inlet is relatively large, which can reduce the flow resistance of airflow from the main air inlet to the main air inlet. Similarly, the angle between the main air inlet and the second branch is relatively large, which can reduce the flow resistance of airflow from the main air inlet to the second branch.

[0019] In some embodiments, the main air duct is located above the heat exchanger, and the air duct branch is connected to the upper end of the main air duct. The downstream flow channel of the second branch includes: a first flow channel section, which is formed by a downward indentation of a portion of the upper surface of the main air duct, and the upper end of the first flow channel section is connected to the lower end of the upstream flow channel of the second branch; and a second flow channel section, which extends along the vertical sidewall of the main air duct, and the upper end of the second flow channel section is connected to the first flow channel section, and the lower end of the second flow channel section is connected to the second circulation groove.

[0020] In this technical solution, by specifically designing the downstream flow channel of the second branch on the main air duct, the downstream flow channel of the second branch connects the upstream flow channel of the second branch with the second circulation channel.

[0021] In some embodiments, a rotatable reversing baffle is provided at the branch of the main flow channel; the reversing baffle can switch between a first state and a second state. In the first state, the reversing baffle blocks the second branch flow channel, so that the main flow channel is connected to the first branch flow channel. In the second state, the reversing baffle blocks the first branch flow channel, so that the main flow channel is connected to the second branch flow channel.

[0022] In this technical solution, by setting a rotatable reversing baffle, it is possible to block the flow of air to the second branch channel while connecting the first branch channel, and to block the flow of air to the first branch channel while connecting the second branch channel.

[0023] In some embodiments, the indoor unit of the air conditioner further includes a curtain assembly that is movable close to the inner wall of the base plate and the inner wall of the first side panel to selectively block the first air outlet or the second air outlet.

[0024] In this technical solution, the opening and closing of the first and second air outlets are controlled by setting a movable floor curtain assembly.

[0025] In some embodiments, the curtain assembly includes: a drive shaft rotatably connected to the housing, the drive shaft being disposed at the corner formed by the first side panel and the bottom plate; a curtain, extending from the bottom of the drive shaft to the side of the drive shaft facing the first side panel, the curtain engaging with the drive shaft via teeth to move the curtain when the drive shaft rotates, the opposite ends of the curtain being a first end and a second end, the first end of the curtain being located above the second end of the curtain; a first elastic member, the upper end of the first elastic member being fixed relative to the housing, the lower end of the first elastic member being connected to the first end of the curtain; and a second elastic member, the end of the second elastic member away from the first side panel being fixed relative to the housing, the end of the second elastic member near the first side panel being connected to the second end of the curtain.

[0026] In this technical solution, by setting the drive shaft and the curtain to mesh with teeth, the curtain can be moved when the drive shaft rotates. By setting the first elastic element and the second elastic element, the curtain can be moved along a preset "L" shaped path. Attached Figure Description

[0027] Figure 1 A perspective view of an indoor air conditioning unit according to some embodiments is shown; Figure 2 An internal diagram of an air conditioner indoor unit according to some embodiments is shown; Figure 3 An internal diagram of an air conditioner indoor unit in cooling mode, according to some embodiments, is shown. Figure 4 An internal diagram of an air conditioner indoor unit in heating mode, according to some embodiments, is shown; Figure 5A perspective view of an air duct forming element in an indoor air conditioning unit according to some embodiments is shown; Figure 6 A cross-sectional view of an air duct forming element in an indoor air conditioning unit according to some embodiments is shown; Figure 7 It shows Figure 6 Sectional view along the BB direction; Figure 8 An exploded view of the air duct forming element in an indoor air conditioning unit according to some embodiments is shown.

[0028] In the above figures, 10 is the casing; 10a is the first air duct; 10b is the second air duct; 11 is the top plate; 12 is the bottom plate; 12a is the second air outlet; 13 is the first side panel; 13a is the first air outlet; 14 is the second side panel; 14a is the air inlet; 20 is the fan; 21 is the impeller; 22 is the volute; 22a is the exhaust port; 22b is the through section; 30 is the heat exchanger; 40 is the main air duct component; 40a is the main flow channel; 50 is the air duct forming component; 50a is the second branch flow channel; 51 is the main air duct section; 51a is the ventilation cavity; 5 1b. Connecting cavity; 51c. First circulating groove; 51d. Second circulating groove; 51f. Downstream flow channel of the second branch; 51g. First flow channel section; 51h. Second flow channel section; 52. Air duct branch; 521. Main air inlet section; 522. First branch; 522a. First branch flow channel; 523. Second branch; 523a. Upstream flow channel of the second branch; 53. Protruding ring; 54. First main body; 55. Second main body; 60. Reversing baffle; 70. Curtain assembly; 71. Curtain; 72. Drive shaft; 73. Spring. 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. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[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, "a plurality of" 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] In this application, the air conditioner performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies 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] This application relates to an indoor unit for air conditioning an indoor space. In the following text, for convenience, the indoor unit including the indoor heat exchanger is referred to as an air conditioning indoor unit, and the indoor heat exchanger is referred to as a heat exchanger 30.

[0039] Reference Figures 1 to 4 An indoor air conditioning unit according to an embodiment of this application includes a housing 10.

[0040] The housing 10 is generally rectangular in shape, forming the overall appearance of the indoor air conditioning unit. The housing 10 may include a top plate 11, forming the top structure of the housing 10; a bottom plate 12, forming the bottom structure of the housing 10; and side panels, connecting the top plate 11 and the bottom plate 12.

[0041] A set of opposing side panels are a first side panel 13 and a second side panel 14. An air inlet 14a can be provided on the second side panel 14, through which air from the indoor space enters the housing 10. An air outlet can be provided on the end of the housing 10 away from the air inlet 14a, through which air from inside the housing 10 is sent to the indoor space.

[0042] In other embodiments, the air inlet 14a may be disposed on the base plate 12, specifically located at the end of the base plate 12 away from the air outlet.

[0043] Reference Figures 2 to 4 The indoor unit of the air conditioner includes a fan 20. The fan 20 is located inside the casing 10, allowing air to flow from the air inlet 14a to the air outlet.

[0044] The indoor unit of the air conditioner includes a heat exchanger 30. The heat exchanger 30 is disposed inside the casing 10 and located on the air movement path from the air inlet 14a to the air outlet, for absorbing heat from the air introduced into the air inlet 14a or transferring heat to the air.

[0045] The heat exchanger 30 includes heat exchanger refrigerant tubes on which refrigerant flows; and heat exchanger fins that increase the surface area of ​​the heat exchanger refrigerant tubes to improve the heat exchange efficiency between the refrigerant and the air. The heat exchanger 30 can be V-shaped, straight plate-shaped, or arc-shaped.

[0046] In some embodiments, the fan 20 is a centrifugal fan. The fan 20 is positioned near the air inlet 14a, and the air outlet 22a of the fan 20 faces the heat exchanger 30. Multiple fans 20 may be arranged at intervals.

[0047] The arrangement direction of the first side panel 13 and the second side panel 14 is defined as the first direction X, and the direction perpendicular to both the first direction X and the height direction Z is defined as the second direction Y. Multiple fans 20 are arranged along the second direction Y.

[0048] The fan 20 includes an impeller 21. The impeller 21 rotates to drive airflow. The impeller 21 includes a generally disc-shaped central disk and a plurality of blades connected along the outer periphery of the central disk.

[0049] The fan 20 includes a volute 22. The volute 22 is fitted over the impeller 21, and through-holes are provided on both sides of the volute 22 in the second direction Y, through which air enters the volute 22. The exhaust port 22a of the volute 22 faces the heat exchanger 30.

[0050] The fan 20 includes a motor (not shown in the figure). The motor is fixedly connected to the housing 10, and the output shaft of the motor is connected to the impeller 21 to drive the impeller 21 to rotate.

[0051] In other embodiments, the fan 20 may be a cross-flow fan.

[0052] In some embodiments, continue to refer to Figures 2 to 4 The unit has at least two air outlets. The two air outlets are a first air outlet 13a and a second air outlet 12a. The first air outlet 13a is located on the first side panel 13, and the second air outlet 12a is located on the bottom plate 12 near the first side panel 13.

[0053] The first air outlet 13a on the first side panel 13 can deliver air horizontally, and the second air outlet 12a on the base plate 12 can deliver air downwards.

[0054] When cooling, you can choose to send air horizontally into the room from the first air outlet 13a to avoid the problem of cold air blowing directly on people and causing poor comfort. It also helps the cold air to cover the entire room from top to bottom. When heating, you can choose to send air downward from the second air outlet 12a to help the hot air sink and avoid the problem of the hot air not being able to blow down, which would result in poor heating effect.

[0055] This application provides a first air outlet 13a on the first side panel 13 and a second air outlet 12a on the bottom plate 12. Cooling air is blown out from the first air outlet 13a and heating air is blown out from the second air outlet 12a, which significantly improves the comfort of indoor space temperature.

[0056] In some embodiments, a first air duct 10a is provided inside the housing 10. The first air duct 10a connects the exhaust port 22a and the outlet port of the volute 22. A heat exchanger 30 is disposed inside the first air duct 10a. The air discharged from the exhaust port 22a of the volute 22 is heated by the heat exchanger 30 in the first air duct 10a and then flows to the outlet port.

[0057] The first air duct 10a has a first air outlet end corresponding to the first air outlet 13a and a second air outlet end corresponding to the second air outlet 12a.

[0058] When the first air outlet 13a is opened, the air in the first air duct 10a flows out from the first air outlet. When the second air outlet 12a is opened, the air in the first air duct 10a flows out from the second air outlet.

[0059] In some embodiments, the housing 10 has a second air duct 10b that is independent of the first air duct 10a. The second air duct 10b extends from the end connected to the volute 22 toward the air outlet.

[0060] The volute 22 has a through-section 22b that connects its interior and exterior. The air inlet of the second air duct 10b is connected to the through-section 22b. Some of the air inside the volute 22 flows to the second air duct 10b through the through-section 22b.

[0061] The second air duct 10b includes a first branch flow duct 522a. A first circulation groove 51c is provided at the end of the first branch flow duct 522a, and the first circulation groove 51c is arranged around the first air outlet end of the first air duct 10a. When the first branch flow duct 522a is connected, air from the second air duct 10b can flow through the first branch flow duct 522a to the first circulation groove 51c, and then flow from the first circulation groove 51c into the room. The first circulation groove 51c is arranged around the first air outlet end, such that the airflow flowing out of the first circulation groove 51c forms an annular wrapping around the airflow flowing out of the first air outlet end.

[0062] The second air duct 10b includes a second branch flow duct 50a. A second circulation groove 51d is provided at the end of the second branch flow duct 50a, and the second circulation groove 51d surrounds the second air outlet. When the second branch flow duct 50a is connected, air in the second air duct 10b can flow through the second branch flow duct 50a to the second circulation groove 51d, and then flow from the second circulation groove 51d into the room. The second circulation groove 51d surrounds the second air outlet, so that the airflow from the second circulation groove 51d envelops the airflow from the second air outlet.

[0063] Reference Figure 3 The arrows in the diagram indicate the airflow direction. When the first air outlet 13a is open and the first branch channel 522a is connected, the operation of the fan 20 causes the air in the volute 22 to split into two paths: one path flows out through the first air outlet of the first air duct 10a, and the other path flows out through the first circulation groove 51c of the second air duct 10b.

[0064] When the fan 20 is operating, the first air duct 10a and the second air duct 10b generate continuous airflow. The high-speed airflow in the first air duct 10a changes temperature and becomes low-speed airflow after passing through the heat exchanger 30, and flows out from the first air outlet. Simultaneously, the high-speed airflow in the second air duct 10b does not pass through the heat exchanger 30. The high-speed airflow flowing out from the first circulation slot 51c envelops the low-speed airflow flowing out from the first air outlet. This causes the high-speed airflow that has not passed through the heat exchanger 30 to be drawn into the low-speed airflow that has passed through the heat exchanger 30 through a suction effect, allowing the airflow from the first air outlet 13a to cover the indoor space more quickly and increasing the horizontal air delivery range of the indoor air conditioning unit. During the suction process, the high-speed airflow that has not passed through the heat exchanger 30 mixes with the low-speed airflow that has passed through the heat exchanger 30, thereby reducing the temperature difference between the air conditioning outlet and the indoor temperature and improving the comfort of the airflow.

[0065] Reference Figure 4 The arrows in the diagram indicate the airflow direction. When the second air outlet 12a is open and the second branch channel 50a is connected, the operation of the fan 20 causes the air in the volute 22 to split into two paths: one path flows out through the second air outlet of the first air channel 10a, and the other path flows out through the second circulation groove 51d of the second air channel 10b.

[0066] The high-speed airflow exiting the second circulation slot 51d envelops the airflow exiting the second air outlet, causing the high-speed airflow that has not yet passed through the heat exchanger 30 to be drawn in by the low-speed airflow passing through the heat exchanger 30 through the entrainment effect. This allows the air conditioner's exhaust air to reach the lower floor of the room more quickly, increasing the downward airflow range of the air conditioner. During the entrainment process, the high-speed airflow that has not yet passed through the heat exchanger 30 mixes with the low-speed airflow that has passed through the heat exchanger 30, thereby reducing the temperature difference between the air conditioner's exhaust air and the indoor temperature and improving the comfort of the exhaust air.

[0067] In some embodiments, when one of the first air outlet 13a and the second air outlet 12a is in an open state, the other is in a closed state; the opening and closing state of the first branch channel 522a is the same as the opening and closing state of the first air outlet 13a, and the opening and closing state of the second branch channel 50a is the same as the opening and closing state of the second air outlet 12a.

[0068] Reference Figure 3 When the air conditioner is operating in cooling mode, the first air outlet 13a and the first branch duct 522a are both connected, while the second air outlet 12a and the second branch duct 50a are both closed. Air flows out of the first duct 10a and the second duct 10b in the same direction, along the first direction X, avoiding direct cold air blowing on people and preventing discomfort. This also facilitates the cold air covering the entire indoor space from top to bottom.

[0069] In addition, the high-speed airflow from the second air duct 10b envelops the low-speed airflow from the first air duct 10a. Under the effect of the entrainment effect, the high-speed airflow pulls the low-speed airflow to flow further away, thereby increasing the horizontal air supply distance of the air conditioner, improving the cooling effect, and avoiding the problem of concentrated cold air falling and concentrated low temperature areas caused by short air supply distance.

[0070] In addition, the second air duct 10b carries hot air that has not been heated by the heat exchanger 30, while the first air duct 10a carries cold air that has been heated by the heat exchanger 30. The hot and cold air mix outside the first air outlet 13a, which reduces the risk of condensation at the first air outlet 13a and improves the comfort of the cold air.

[0071] Reference Figure 4 When the air conditioner is operating in heating mode, the first air outlet 13a and the first branch duct 522a are both closed, while the second air outlet 12a and the second branch duct 50a are both connected. Air flows out of the first duct 10a and the second duct 10b in the same direction, downwards. This utilizes the potential energy of the warm air in the lower part of the room to mix with the hot air in the upper part, improving heat transfer efficiency and avoiding the stratification of hot and cold air that would occur if the hot air were blown horizontally and concentrated in the upper part of the room.

[0072] In addition, the high-speed airflow from the second air duct 10b envelops the low-speed airflow from the first air duct 10a. Under the effect of the entrainment effect, the high-speed airflow pulls the low-speed airflow to flow further away, thereby increasing the downward air delivery distance of the air conditioner and allowing the air conditioner to reach the lower floor of the room more quickly, thus improving the heating effect.

[0073] In addition, the second air duct 10b carries out cold air that has not been heated by the heat exchanger 30, while the first air duct 10a carries out hot air that has been heated by the heat exchanger 30. The hot and cold air mix outside the second air outlet 12a, which improves the comfort of the air conditioning.

[0074] In some embodiments, the indoor unit of the air conditioner includes a main air duct member 40 for forming a main flow channel 40a of the second air duct 10b. The air inlet end of the main air duct member 40 is connected to the volute 22 corresponding to the through portion 22b.

[0075] The main air duct component 40 can be integrally injection molded with the volute 22. Alternatively, the main air duct component 40 and the volute 22 can be connected by fasteners such as screws and / or clips.

[0076] Reference Figures 5 to 8 The indoor unit of the air conditioner includes a duct forming member 50, which is located on the leeward side of the heat exchanger 30 and is used to form the downstream portion of the first duct 10a and the second duct 10b. The duct forming member 50 is connected to the air outlet end of the main duct member 40.

[0077] A ventilation cavity 51a is provided on the air duct forming member 50. The ventilation cavity 51a extends through the air duct forming member 50 along the first direction X. The ventilation cavity 51a is part of the first air duct 10a and is used to connect the leeward side of the heat exchanger 30 with the first air outlet 13a. The end of the ventilation cavity 51a facing the first air outlet 13a forms the first air outlet end of the first air duct 10a. A connecting cavity 51b is provided on the bottom wall of the air duct forming member 50 at a position corresponding to the second air outlet 12a. The connecting cavity 51b serves as the second air outlet end of the first air duct 10a and is connected to the ventilation cavity 51a.

[0078] The air duct forming member 50 has a first annular groove 51c at the end facing the first air outlet 13a, and the opening of the first annular groove 51c faces the first air outlet 13a. The air duct forming member 50 has a second annular groove 51d surrounding the outer periphery of the connecting cavity 51b, and the opening of the second annular groove 51d faces downward.

[0079] The air duct forming component 50 is provided with a first branch flow channel 522a, which is connected between the main flow channel 40a and the first circulation groove 51c.

[0080] The air duct forming component 50 is provided with a second branch flow channel 50a, which is connected between the main flow channel 40a and the second circulation groove 51d.

[0081] This application achieves a manufacturable design by setting up an air duct forming member 50 and providing downstream portions of a first air duct 10a and a second air duct 10b on the air duct forming member 50, thereby enabling the first circulation groove 51c to surround the first air outlet end and the second circulation groove 51d to surround the second air outlet end.

[0082] In some embodiments, the duct forming member 50 includes a duct branch 52. The air inlet end of the duct branch 52 is connected to the air outlet end of the duct main member 40. A first branch flow channel 522a is formed on the duct branch 52.

[0083] A second branch upstream flow channel 523a is formed on the air duct branch 52. The second branch upstream flow channel 523a is the upstream part of the second branch flow channel 50a.

[0084] The air duct forming member 50 includes a main air duct portion 51. The main air duct portion 51 is generally rectangular cylindrical. The air outlet end of the air duct branch portion 52 is connected to the outer periphery of the main air duct portion 51.

[0085] The first circulation groove 51c is formed by an inward indentation at one end of the main air duct section 51 facing the first air outlet 13a. The second circulation groove 51d is formed by an upward indentation at a portion of the bottom surface of the main air duct section 51.

[0086] A second branch downstream flow channel 51f is formed on the side wall of the main air duct section 51, which connects the upstream flow channel 523a of the second branch and the second circulation groove 51d.

[0087] Ventilation cavity 51a extends through main air duct section 51 along the first direction X. Connecting cavity 51b is located on the bottom wall of main air duct section 51 at a position corresponding to the second air outlet 12a.

[0088] In some embodiments, the air duct branch 52 includes an air inlet main body 521, the air inlet end of which is connected to the air duct main body 40.

[0089] The air duct branch 52 includes a first branch 522, the air inlet of the first branch 522 is connected to the air outlet of the main air inlet 521, and the air outlet of the first branch 522 is connected to the upper end of the first circulation groove 51c and the main air duct 51.

[0090] The air duct branch 52 includes a second branch 523. The air inlet of the second branch 523 is connected to the air outlet of the main air inlet 521. The air outlet of the second branch 523 is connected to the upper end of the downstream flow channel 51f of the second branch and the main air duct 51.

[0091] The first branch flow channel 522a is provided on the first branch 522, and the second branch upstream flow channel 523a is provided on the second branch 523.

[0092] In some embodiments, the main air duct member 40 extends generally along the first direction X, and the main air inlet member 521 is inclined relative to the height direction Z.

[0093] The angle between the main air duct component 40 and the main air inlet component 521 is α, where α ≥ 110°. This large angle between the main air duct component 40 and the main air inlet component 521 can reduce the flow resistance of airflow from the main air inlet component 521 to the main air inlet component 521.

[0094] In some embodiments, the first branch 522 is located on the extension line of the main air intake 521. The first branch 522 and the main air intake 521 do not form an angle, which can ensure the smooth flow of air from the main air intake 521 to the first branch 522 and reduce flow resistance.

[0095] In some embodiments, the second branch 523 extends along the height direction and connects the main air intake section 521 and the main air duct section 51.

[0096] The angle between the second branch 523 and the main air intake 521 is β, where β ≥ 110°. The large angle between the main air intake 521 and the second branch 523 can reduce the flow resistance of the airflow from the main air intake 521 to the second branch 523.

[0097] In some embodiments, the main air duct 40 is located above the heat exchanger 30. The air duct branch 52 is connected to the upper side of the main air duct section 51.

[0098] The main air intake branch 521 slopes downward from its air intake end to its air outlet end. The first branch 522 slopes downward from its air intake end to its air outlet end. The second branch 523 extends downward along the height direction Z from its air intake end to its air outlet end.

[0099] In some embodiments, the downstream flow channel 51f of the second branch includes a first flow channel section 51g. The first flow channel section 51g is formed by a downwardly recessed portion of the upper end of the main air duct 51, and the upper end of the first flow channel section 51g is connected to the lower end of the upstream flow channel 523a of the second branch.

[0100] The downstream flow channel 51f of the second branch includes a second flow channel section 51h. The second flow channel section 51h extends along the vertical sidewall of the main air duct section 51, and the upper end of the second flow channel section 51h is connected to the first flow channel section 51g, and the lower end of the second flow channel section 51h is connected to the second circulation groove 51d.

[0101] In some embodiments, the bottom surface of the main air duct portion 51 is provided with a downwardly extending protruding ring 53, and the inner cavity of the protruding ring 53 forms a communicating cavity 51b. The second circulation groove 51d is formed by an upward indentation from the bottom end surface of the protruding ring 53. By providing the protruding ring 53, the depth of the second circulation groove 51d can be increased, making the airflow flowing out of the second circulation groove 51d more uniform in the circumferential direction.

[0102] If the depth of the second circulation channel 51d is relatively shallow, since the downstream flow channel 51f of the second branch is connected to a local position of the second circulation channel 51d, most of the air in the downstream flow channel 51f of the second branch will flow out in a straight line instead of flowing out after circling the second circulation channel 51d. This will result in a situation where there is more air in some parts and very little air in others in the circumferential direction.

[0103] In some embodiments, see specific references Figure 8 The air duct forming component 50 includes a first main body portion 54 and a second main body portion 55, which are joined together to form a complete air duct forming component 50. A portion of the second branch downstream flow channel 51f is located on the first main body portion 54, and another portion of the second branch downstream flow channel 51f is located on the second main body portion 55. This facilitates the machining of the second branch downstream flow channel 51f on the first main body portion 54 and on the second main body portion 55.

[0104] The first main body 54 and the second main body 55 can be connected together by ultrasonic welding.

[0105] In some embodiments, the air duct branch 52 and the main air duct 51 can be integrally formed.

[0106] The main duct component 40 and the branch duct 52 can be connected by a plug-in connection. For example, the air inlet main body 521 of the branch duct 52 is plugged into the air outlet end of the main duct component 40. In other embodiments, the main duct component 40 and the branch duct 52 can be connected together by ultrasonic welding.

[0107] In some embodiments, the vertical sidewall of the air duct forming member 50 is connected to the side panel of the housing 10 by screws. The vertical sidewall is a sidewall that extends along the height direction Z.

[0108] In some embodiments, the flow path cross-section of the main air duct component 40 may be rectangular, and the dimension Z in the height direction of the main air duct component 40 is much smaller than the height of the heat exchanger 30, so that the flow path cross-sectional area of ​​the main air duct component 40 is much smaller than the flow path cross-sectional area of ​​the first air duct 10a, and the airflow velocity in the main air duct component 40 is greater than the airflow velocity in the first air duct 10a.

[0109] The flow path cross-sectional area at branch 52 of the air duct is not much different from that at main branch 40 of the air duct.

[0110] In the first embodiment, referring to Figures 2 to 4 A reversing baffle 60 is provided at the branch of the second air duct 10b, and the reversing baffle 60 is rotatably arranged.

[0111] The reversing baffle 60 can switch between a first state and a second state. In the first state, the reversing baffle 60 blocks the second branch flow channel 50a, so that the main flow channel 40a is connected to the first branch flow channel 522a. In the second state, the reversing baffle 60 blocks the first branch flow channel 522a, so that the main flow channel 40a is connected to the second branch flow channel 50a.

[0112] A reversing baffle 60 is disposed at a branch of the air duct branch 52. The sidewalls of the first branch 522 and the second branch 523, which are close to each other, are connected at the air inlet end A. The rotating shaft end of the reversing baffle 60 is rotatably connected to the air inlet end A. The end of the reversing baffle 60 opposite to its rotating shaft end is located inside the main air inlet section 521.

[0113] The reversing baffle 60 can be driven by a motor or by no power, such as electromagnetic attraction.

[0114] In some embodiments, the first air duct 10a and the second air duct 10b are separated by a foam layer to prevent the transfer of temperature between the first air duct 10a and the second air duct 10b.

[0115] In some embodiments, refer to Figure 2 The indoor unit of the air conditioner includes a curtain assembly 70. The curtain assembly 70 can move close to the inner wall of the base plate 12 and the inner wall of the first side panel 13 to selectively block the first air outlet 13a or the second air outlet 12a.

[0116] The curtain assembly 70 includes a curtain 71, which is made of a flexible material. When the curtain 71 is opposite to the first air outlet 13a, it blocks the first air outlet 13a; when the curtain 71 is offset from the first air outlet 13a, it opens the first air outlet 13a. When the curtain 71 is opposite to the second air outlet 12a, it blocks the second air outlet 12a; when the curtain 71 is offset from the second air outlet 12a, it opens the second air outlet 12a.

[0117] The curtain assembly 70 includes a drive shaft 72. The drive shaft 72 is rotatably connected within the housing 10 and is used to drive the curtain 71 to move.

[0118] A portion of the curtain 71 extends vertically, and another portion extends horizontally, forming an "L" shape. The movement path of the curtain 71 is also "L" shaped. The two ends along the length of the curtain 71 are the first end and the second end, respectively. The first end of the curtain 71 is the free end of the vertically extended portion, and the second end of the curtain 71 is the free end of the horizontally extended portion.

[0119] When the first end of the curtain 71 moves upward, the vertical extension of the curtain 71 increases and covers the first air outlet 13a; the horizontal extension of the curtain 71 decreases, and the second end of the curtain 71 moves toward the first side panel 13, thereby causing the horizontal extension of the curtain 71 to be offset from the second air outlet 12a.

[0120] When the second end of the curtain 71 moves away from the first side panel 13, the lateral extension of the curtain 71 increases and covers the second air outlet 12a; the vertical extension of the curtain 71 decreases, and the first end of the curtain 71 moves downward, thereby causing the vertical extension of the curtain 71 to be misaligned with the first air outlet 13a.

[0121] In some embodiments, the curtain 71 and the drive shaft 72 are connected by toothed meshing. The curtain 71 has toothed belts at both ends in the width direction, and the drive shaft 72 has gears at both ends in the length direction. The gears of the drive shaft 72 mesh with the toothed belts on the curtain 71, and the drive shaft 72 drives the curtain 71 to move when it rotates.

[0122] In some embodiments, the drive shaft 72 is located near the corner formed by the first side panel 13 and the base plate 12. The curtain 71 wraps around the underside of the drive shaft 72 to the side of the drive shaft 72 closest to the first side panel 13. Supported by the drive shaft 72, the curtain 71 is arranged in an "L" shape.

[0123] In some embodiments, the drive shaft 72 is driven by a motor, which is fixedly connected to the housing 10. The output shaft of the motor is connected to the drive shaft 72, thereby driving the drive shaft 72 to rotate. The rotation of the drive shaft 72 further drives the curtain 71 to move.

[0124] For example, when the motor causes the drive shaft 72 to rotate clockwise, the curtain 71 opens the first air outlet 13a and covers the second air outlet 12a; when the motor causes the drive shaft 72 to rotate counterclockwise, the curtain 71 opens the second air outlet 12a and covers the first air outlet 13a.

[0125] In some embodiments, the curtain assembly 70 includes a first elastic member, the length of which extends along the height direction Z, the upper end of which is fixed relative to the housing 10, and the lower end of which is connected to the upper end (first end of the curtain 71). The curtain assembly 70 includes a second elastic member whose length direction is along the first direction X. One end of the second elastic member away from the first side panel 13 is fixed relative to the housing 10, and the other end is connected to the lower end (second end of the curtain 71).

[0126] The first elastic element and the second elastic element can be spring 73.

[0127] In this application, the arrangement of the first elastic element, the second elastic element, and the drive shaft 72 enables the curtain 71 to move along an "L"-shaped path.

[0128] In some embodiments, the upper end of the first elastic member may be connected to the top plate 11 of the housing 10. The end of the second elastic member away from the first side panel 13 may be connected to the water tray or to the third and fourth side panels of the housing 10. The third and fourth side panels are connected to the two ends of the first side panel 13 in the second direction Y.

[0129] In some embodiments, the end of the air duct forming member 50 facing the first air outlet 13a has a first gap between it and the first side panel 13, allowing the curtain 71 to move through the first gap. The opening end of the second annular groove has a second gap between it and the bottom plate 12, allowing the curtain 71 to move through the second gap.

[0130] When the air conditioner is operating in cooling mode, the drive shaft 72 rotates clockwise, causing the curtain 71 to open the first air outlet 13a and cover the second air outlet 12a; at the same time, the reversing baffle 60 is activated, causing the second branch flow channel 50a to disconnect and the first branch flow channel 522a to connect, so as to realize that the first air duct 10a and the second air duct 10b simultaneously deliver air along the first direction X.

[0131] When the air conditioner is in heating mode, the drive shaft 72 rotates counterclockwise, causing the curtain 71 to open the second air outlet 12a and cover the first air outlet 13a; at the same time, the reversing baffle 60 is activated, causing the first branch flow channel 522a to disconnect and the second branch flow channel 50a to connect, so as to achieve simultaneous downward airflow from the first air duct 10a and the second air duct 10b.

[0132] It should be noted that the first air outlet 13a and the second air outlet 12a can also be opened and closed in other ways.

[0133] 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.

[0134] 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 housing has at least two air outlets, namely a first air outlet located on the first side panel of the housing and a second air outlet located on the bottom plate of the housing. A heat exchanger is located inside the casing; A fan is located on the windward side of the heat exchanger. The fan includes a volute, the volute has an exhaust port, and the volute has a through-hole connecting its interior and exterior. The main air duct component has an air inlet end that is connected to the volute corresponding to the through-hole, and a main flow channel is formed inside the main air duct component. A duct forming element is disposed on the leeward side of the heat exchanger, and the duct forming element is provided with: A ventilation cavity extends through the air duct forming member and connects the leeward side of the heat exchanger with the first air outlet. The connecting cavity, corresponding to the second air outlet, penetrates the bottom wall of the air duct forming member; The first branch flow channel and the second branch flow channel are respectively connected to the main flow channel; The first circulation groove is connected to the air outlet end of the first branch flow channel, and the first circulation groove surrounds the outside of the ventilation cavity; The second circulation groove is connected to the air outlet end of the second branch flow channel, and the second circulation groove surrounds the outside of the connecting cavity; When the first air outlet is open and the first branch flow channel is connected, the fan operates, causing the air inside the volute to split into two paths: one path flows through the heat exchanger and out of the ventilation cavity; the other path flows through the main flow channel and the first branch flow channel and out of the first circulation groove. The air flowing out of the first circulation groove forms a ring-shaped envelope around the air flowing out of the ventilation cavity. When the second air outlet is open and the second branch flow channel is connected, the fan operates, causing the air inside the volute to split into two paths: one path flows through the heat exchanger and out of the connecting cavity, and the other path flows through the main flow channel and the second branch flow channel and out of the second circulation groove. The air flowing out of the second circulation groove forms an annular wrapping around the air flowing out of the connecting cavity.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The second branch flow channel includes an upstream flow channel of the second branch and a downstream flow channel of the second branch; The air duct forming element includes: A branch section of the air duct, wherein the air inlet end of the branch section is connected to the air outlet end of the main air duct component, and a first branch flow channel and a second branch upstream flow channel are formed on the branch section; The main air duct section is connected to the air duct branch section; The ventilation cavity extends through the main air duct section in a direction perpendicular to the first air outlet; the connecting cavity extends through the bottom wall of the main air duct section; the first circulation groove is located at one end of the main air duct section near the first air outlet; the second circulation groove is located at the bottom of the main air duct section; the downstream flow channel of the second branch is located on the side wall of the main air duct section and connects the upstream flow channel of the second branch with the second circulation groove.

3. The indoor unit of the air conditioner according to claim 2, characterized in that, The air duct forming element includes: The protrusion extends downward from the bottom surface of the main air duct section; The connecting cavity extends through the protrusion, and the second circulation groove is formed by the bottom surface of the protrusion being recessed upwards.

4. The indoor unit of the air conditioner according to claim 2, characterized in that, The air duct branch includes: The main air intake section is connected to the main air duct component. The first branch has an air inlet end connected to the air outlet end of the main air inlet section, and the air outlet end of the first branch is connected to the main air duct section corresponding to the first circulation groove. The second branch has an air inlet end connected to the air outlet end of the main air inlet section, and the air outlet end of the second branch is connected to the main air duct section via the downstream flow channel of the second branch. The first branch flow channel is located on the first branch, and the second branch upstream flow channel is located on the second branch.

5. The indoor unit of the air conditioner according to claim 4, characterized in that, Along the direction from the air inlet end to the air outlet end of the main air inlet section, the main air inlet section is inclined, the first branch is located on the extension line of the main air inlet section, and the second branch extends along the height direction; The angle α between the main air duct component and the main air intake component is ≥110°; the angle β between the main air intake component and the second branch is ≥110°.

6. The indoor unit of the air conditioner according to claim 2, characterized in that, The main air duct component is located above the heat exchanger, and the branch air duct is connected to the upper end of the main air duct component; The downstream flow channel of the second branch includes: The first flow channel section is formed by a downward indentation of the upper surface of the main air duct section, and the upper end of the first flow channel section is connected to the lower end of the upstream flow channel of the second branch. The second flow channel section extends along the vertical sidewall of the main air duct section. The upper end of the second flow channel section is connected to the first flow channel section, and the lower end of the second flow channel section is connected to the second circulation groove.

7. The indoor unit of the air conditioner according to claim 1, characterized in that, The main flow channel is provided with a rotatable reversing baffle at its branch points; The reversing baffle can switch between a first state and a second state. In the first state, the reversing baffle blocks the second branch flow channel, so that the main flow channel is connected to the first branch flow channel. In the second state, the reversing baffle blocks the first branch flow channel, so that the main flow channel is connected to the second branch flow channel.

8. The indoor unit of the air conditioner according to any one of claims 1-7, characterized in that, The indoor unit of the air conditioner also includes a curtain assembly that can move close to the inner wall of the base plate and the inner wall of the first side panel to selectively block the first air outlet or the second air outlet.

9. The indoor unit of the air conditioner according to claim 8, characterized in that, The curtain assembly includes: A drive shaft is rotatably connected inside the housing, and the drive shaft is located at the corner formed by the first side panel and the bottom plate; The curtain is wrapped around the bottom of the drive shaft to the side of the drive shaft facing the first side panel. The curtain and the drive shaft are engaged by teeth so that the curtain can be moved when the drive shaft rotates. The opposite ends of the curtain are a first end and a second end, respectively. The first end of the curtain is located above the second end of the curtain. The first elastic element has its upper end fixed relative to the housing, and its lower end connected to the first end of the curtain. The second elastic element has one end away from the first side panel fixed relative to the housing, and the other end of the second elastic element near the first side panel connected to the second end of the curtain.

10. An indoor unit for an air conditioner, characterized in that, include: The housing has at least two air outlets, namely a first air outlet located on the first side panel of the housing and a second air outlet located on the bottom plate of the housing. A heat exchanger is located inside the casing; A fan is located on the windward side of the heat exchanger. The fan includes a volute, the volute has an exhaust port, and the volute has a through-hole connecting its interior and exterior. A first air duct connects the exhaust port and the outlet port of the volute, and the heat exchanger is disposed in the first air duct; the first air duct includes a first outlet port corresponding to the first outlet port and a second outlet port corresponding to the second outlet port. A second air duct, independent of the first air duct, extends from its end connected to the through-hole towards the air outlet; the second air duct includes: First branch flow channel and second branch flow channel; The first circulation groove is connected to the air outlet end of the first branch flow channel, and the first circulation groove surrounds the first air outlet end; The second circulation channel is connected to the air outlet of the second branch channel, and the second circulation channel surrounds the second air outlet. When the first air outlet is open and the first branch flow channel is connected, the fan runs, causing the air inside the volute to split into two paths: one path flows through the first air channel and out of the first air outlet, and the other path flows through the second air channel and out of the first circulation groove. The air flowing out of the first circulation groove forms a ring-shaped envelope around the air flowing out of the first air outlet. When the second air outlet is open and the second branch flow channel is connected, the fan operates, causing the air inside the volute to split into two paths: one path flows through the first air channel and out of the second air outlet, and the other path flows through the second air channel and out of the second circulation groove. The air flowing out of the second circulation groove forms a ring-shaped envelope around the air flowing out of the second air outlet.

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