Air conditioner indoor unit and heating, ventilation and air conditioning system

Abstract

The present application discloses an air conditioner indoor unit and a heating, ventilation and air conditioning system. The air conditioner indoor unit comprises: a housing, wherein an air duct is formed in the housing, an air return port and an air outlet of the air duct are spaced apart in the bottom surface of the housing, the air duct comprises an air outlet part connected to the air outlet, and the air outlet part comprises a first wall body and a second wall body which are spaced apart in a first direction; a cross-flow fan wheel and a heat exchanger, which are spaced apart in the air duct; and an air guide structure, comprising an air deflector, wherein the air deflector is rotationally connected to the housing and located between the first wall body and the second wall body, the air deflector has a first air guide surface and a second air guide surface which are opposite to each other in the thickness direction of the air deflector, and when the air deflector is opened, the first air guide surface faces the first wall body, and the second air guide surface faces the second wall body. A part of the second wall body is arched in a direction away from the air deflector to form an air guide wall surface of a curved structure, and the air guide wall surface can guide airflow to flow along the second air guide surface. The present application can avoid the condensation on the air deflector.

Description

Air conditioner indoor unit and heating and ventilation system

[0001] This application claims priority to Chinese Patent Application No. 202420911492.9, filed on April 28, 2024, entitled "Air conditioner indoor unit and heating and ventilation system", Chinese Patent Application No. 202410523627.9, filed on April 28, 2024, entitled "Air conditioner indoor unit and heating and ventilation system", and Chinese Patent Application No. 202410523626.4, filed on April 28, 2024, entitled "Air conditioner indoor unit and heating and ventilation system", all of which are incorporated by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the field of air conditioning technology, in particular to an air conditioner indoor unit and a heating and ventilation system. BACKGROUND

[0003] The air outlet of the existing air conditioner is usually provided with an air deflector. The user can control the flow direction of the air flow of the air outlet by controlling the opening angle of the air deflector, so that the air flow of the air conditioner can flow in the direction expected by the user, improving the temperature environment in the room.

[0004] However, when the angle between the air deflector and the air flow is too large, the air flow will lose speed. An air flow separation area is generated on the second air deflector surface of the air deflector, and the flow rate in this area is low. The hot and humid air in the room gathers and stays here, causing local condensation. SUMMARY

[0005] The embodiments of the present application provide an indoor unit and a heating and ventilation device, which can effectively discharge the heat generated by the motor.

[0006] In a first aspect, the embodiments of the present application provide an air conditioner indoor unit, which comprises a shell, a wind channel is formed in the shell, and a return air inlet and an air outlet of the wind channel are arranged at the bottom surface of the shell in a spaced manner. The wind channel comprises an air outlet part connected to the air outlet, and the air outlet part comprises a first wall body and a second wall body arranged in a spaced manner.

[0007] A cross-flow fan and a heat exchanger are arranged in the wind channel in a spaced manner; and

[0008] An air deflector structure is arranged in the air outlet part, and the air deflector structure comprises an air deflector. The air deflector is rotatably connected to the shell and located between the first wall body and the second wall body. The air deflector has a first air deflector surface and a second air deflector surface arranged in a spaced manner in the thickness direction of the air deflector. In the case that the air deflector is opened, the first air deflector surface faces the first wall body, and the second air deflector surface faces the second wall body.

[0009] Part of the second wall body is curved away from the deflector to form a curved deflector wall surface, which is configured to guide airflow to flow along the second deflector surface when the deflector is opened.

[0010] The air conditioner indoor unit according to the embodiments of the present application has the air duct arranged at the bottom surface of the shell, the air return opening and the air outlet, which improves the smoothness of air return and air outlet. In addition, the air flow line flows along the second deflector surface of the deflector, which avoids the stagnation and backflow of the air flow in the back plate area of the deflector and reduces the possibility of condensation of moisture in the air. The present application can improve the efficiency and performance of the air conditioning system, avoid unnecessary troubles caused by condensation, and ensure the normal operation and service life of the air conditioning equipment.

[0011] In a second aspect, the embodiments of the present application provide a heating and ventilation system, which comprises an air conditioner outdoor unit and an air conditioner indoor unit as described in any one of the above embodiments, and the air conditioner outdoor unit and the air conditioner indoor unit constitute a circulating flow path. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0013] FIG. 1 is a structural schematic diagram of an embodiment of an air conditioner indoor unit according to the present application;

[0014] FIG. 2 is an exploded view of the air conditioner indoor unit shown in FIG. 1;

[0015] FIG. 3 is a structural schematic diagram of the air conditioner indoor unit according to an embodiment of the present application, in which the deflector is at a first opening angle;

[0016] FIG. 4 is a simulation schematic diagram of the air flow direction in FIG. 3;

[0017] FIG. 5 is a structural schematic diagram of the air conditioner indoor unit according to an embodiment of the present application, in which the deflector is at a second opening angle;

[0018] FIG. 6 is a simulation schematic diagram of the air flow direction in FIG. 5;

[0019] FIG. 7 is a partial schematic diagram of the air conditioner indoor unit according to an embodiment of the present application;

[0020] FIG. 8 is a structural schematic diagram of another embodiment of the air conditioner indoor unit according to the present application;

[0021] Fig. 9 is a side view of the air guide structure of Fig. 8;

[0022] Fig. 10 is a side view of an indoor unit of an air conditioner according to another embodiment of the present application;

[0023] Fig. 11 is a cross-sectional view of the cross-flow fan wheel of the indoor unit of Fig. 10 in the A-A direction;

[0024] Fig. 12 is a radar chart of the circumferential distribution of the blades of one of the fan wheels of the cross-flow fan wheel of Fig. 10;

[0025] Fig. 13a is a velocity field cloud chart of the CFD simulation results of a common fan wheel at the same rotational speed;

[0026] Fig. 13b is a velocity field cloud chart of the CFD simulation results of the cross-flow fan wheel of the present application at the same rotational speed;

[0027] Fig. 14 is a comparison of the frequency spectrums of the common fan wheel and the cross-flow fan wheel of the present application at the same rotational speed.

[0028] Fig. 14 is a comparison of the frequency spectrums of the common fan wheel and the cross-flow fan wheel of the present application at the same rotational speed. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions and advantages of the present application clearer, further detailed descriptions of the embodiments of the present application will be given below with reference to the accompanying drawings.

[0030] The following description of the drawings relates to the drawings in the order of their appearance. Identical or similar elements in different drawings are denoted by identical reference numerals unless otherwise indicated. The implementations described in the following exemplary embodiments are not meant to represent all implementations consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0031] In the description of the present application, it should be understood that the terms "first", "second" and the like are used only for descriptive purposes, and cannot be construed as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood in specific cases. In addition, in the description of the present application, "a plurality of" means two or more, unless otherwise specified. The association relationship of the associated objects is described, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] The embodiments of the present application provide an air conditioner indoor unit 1000 and a heating and ventilation system, the heating and ventilation system comprising an outdoor unit and the air conditioner indoor unit 1000, the outdoor unit and the air conditioner indoor unit 1000 being connected by a pipeline, and a working medium for heat exchange circulating in the outdoor unit and the air conditioner indoor unit 1000 through the pipeline. The heating and ventilation system includes, but is not limited to, air conditioners, multi-split air conditioners, heat pumps, pool machines, water heaters and other equipment.

[0034] The outdoor unit comprises a compressor and an outdoor heat exchanger, and the compressor and the outdoor heat exchanger are both connected with the air conditioner indoor unit 1000 through the pipeline. The air conditioner indoor unit 1000 can be installed at a position of an indoor ceiling or wall, etc., for adjusting the indoor temperature environment, which can adopt the form of ducted air conditioner or ceiling air conditioner, and the embodiments of the present application do not limit this.

[0035] Please refer to FIG. 1 to FIG. 3, the air conditioner indoor unit 1000 comprises a shell 200, a cross-flow fan wheel 3, a heat exchanger 500 and a wind guide structure 100. The shell 200 is provided with an air duct 300, and the bottom surface of the shell 200 is provided with a return air inlet 330 and an air outlet 320 of the air duct 300 at intervals in the front-rear direction YY, and is provided with the return air inlet 330 and the air outlet 320 located at both ends of the air duct 300 and communicating with the air duct 300. The heat exchanger 500 and the cross-flow fan wheel 3 are both arranged in the air duct 300, and the wind guide structure 100 is arranged at the air outlet 320.

[0036] For the convenience of description, in the present application, the up-down direction ZZ, the front-rear direction YY and the left-right direction XX are defined, and the up-down direction ZZ, the front-rear direction YY and the left-right direction XX are arranged at an angle with each other.

[0037] The shell 200 is connected to a ceiling or a wall in a room to provide a mounting base for other structural components in the air conditioner indoor unit 1000. The shell 200 can have various shapes according to actual needs, for example, the shell 200 can be substantially cuboid-shaped to facilitate installation. The shell 200 is configured to form the above-mentioned air duct 300 for gas flow, the air duct 300 extends along the front-rear direction YY, the return air inlet 330 is arranged at the rear part of the shell 200, and the air outlet 320 is arranged at the front part of the shell 200, so that the gas can enter the air duct 300 through the return air inlet 330 and move from rear to front to pass through the cross-flow fan 3 and the heat exchanger 500, and then flow out through the air outlet 320.

[0038] Please refer to FIG. 3, in some embodiments, for the convenience of assembly, the shell 200 includes a shell body 210 and a panel 220, the cross-flow fan 3 and the heat exchanger 500 are both mounted in the shell body 210, and the shell body 210 is connected with the panel 220 to enclose the above-mentioned air duct 300, wherein the panel 220 is provided with the above-mentioned air outlet 320, and the return air inlet 330 can be arranged on the panel 220 or the shell body 210. For example, the air conditioner indoor unit 1000 is installed on a ceiling, the ceiling is provided with a mounting opening, the shell body 210 is arranged above the ceiling, and the panel 220 is arranged below the shell body 210 and connected with the shell body 210. At least part of the panel 220 is exposed at the mounting opening, and the air outlet 320 and the return air inlet 330 are arranged on the panel 220 along the front-rear direction YY at intervals to ensure the smoothness of return air and outlet air. In this way, the shell 200 of the embodiment of the present application not only facilitates the assembly of the air conditioner indoor unit 1000, but also improves the maintenance efficiency when the panel 220 is directly disassembled to expose the cross-flow fan 3, the heat exchanger 500 and other components, without the need to disassemble the entire air conditioner indoor unit 1000.

[0039] In the embodiment of the present application, the shell body 210 and the panel 220 can each be a metal material such as an aluminum alloy or stainless steel to meet the requirements of high strength and corrosion resistance, or the shell body 210 and the panel 220 can be made of plastic to achieve lightweight of the air duct 300 assembly, which is not limited in the present application. For example, the shell body 210 can be made of a metal material, and the panel 220 can be made of plastic. In addition, the connection mode of the shell body 210 and the panel 220 is not limited in the embodiment of the present application, and they can be connected individually or in combination by clamping, riveting, welding, bolt connection and the like.

[0040] The cross-flow fan 3 is arranged in the air duct 300 and can extract the air at the return air inlet 330 and work on the air to provide power for the circulation of the air in the air duct 300. The cross-flow fan 3 can be a cross-flow fan 3, a centrifugal cross-flow fan 3, or an axial cross-flow fan 3, etc. As shown in FIG. 3, the cross-flow fan 3 has the advantages of energy saving, large air volume, low noise, and simple installation. In this embodiment, the cross-flow fan 3 includes an impeller and a motor 40, the impeller is arranged in a long cylindrical shape extending along the left-right direction XX, the motor 40 is arranged at one end of the impeller and connected with the shell 200, and the output shaft of the motor 40 is connected with the impeller. One side of the impeller in the circumferential direction is arranged to be substantially directed to the return air inlet 330, and this side of the impeller is defined as the air inlet side; the other side of the impeller in the circumferential direction and spaced from the air inlet side is arranged to be substantially directed to the air outlet 320, and this side of the impeller is defined as the air outlet side. A plurality of blades are distributed along the circumferential direction of the impeller, and when the motor 40 drives the impeller to rotate, the rotating blades can promote the air to flow from the air inlet side to the air outlet side.

[0041] The heat exchanger 500 can be arranged at one side of the cross-flow fan 3 close to the air outlet 320 or at one side of the cross-flow fan 3 close to the return air inlet 330, and is used to exchange heat with the air flowing through the air duct 300 and passing through the heat exchanger 500, so as to play a role of refrigerating or heating the air. For example, a plurality of refrigerant pipes are arranged in the heat exchanger 500, the plurality of refrigerant pipes are connected with an outdoor unit, and refrigerant flows in the heat exchanger 500. When the air passes through the heat exchanger 500, the air exchanges heat with the refrigerant in the refrigerant pipes, so as to reduce the temperature and form low-temperature air. Optionally, in order to improve the heat exchange efficiency, the heat exchanger 500 can be arranged in a shape, an arc shape, or a wave shape, and can be composed of a single heat exchange sheet or a plurality of heat exchange sheets. In the embodiment shown in FIG. 3, the return air inlet 330 is arranged below the shell 200, and the heat exchanger 500 is arranged obliquely, which can make the heat exchanger 500 have a larger heat exchange area with the flowing air, and can also reduce the included angle between the air flow entering from the return air inlet 330 and the heat exchanger 500, so that the air flow can pass through the heat exchanger 500 more smoothly, thereby further improving the heat exchange efficiency.

[0042] The air duct 300 comprises an air outlet part 310 connected to the air outlet 320, and the air outlet part 310 comprises a first wall body 311 and a second wall body 312 arranged opposite to each other. In the present application, the first wall body 311 and the second wall body 312 can be arranged opposite to each other in the front-rear direction YY. In the airflow direction of the air duct 300, the cross-flow fan 3 is located downstream of the heat exchanger 500, and the air outlet part 310 is arranged between the cross-flow fan 3 and the air outlet 320. The air guide structure 100 comprises an air guide plate 10, which is rotationally connected to the shell 200 and located between the first wall body 311 and the second wall body 312. The air guide plate 10 is used to adjust the airflow direction and airflow volume at the air outlet 320. In the present application, the air guide plate 10 always has a gap with the second wall body 312 during rotation, so as to avoid interference between the air guide plate 10 and the air outlet part 310 during operation.

[0043] The air guide plate 10 comprises a first air guide surface 11 and a second air guide surface 12 arranged opposite to each other. In the case that the air guide plate 10 is opened, the first air guide surface 11 is close to the first wall body 311, and the second air guide surface 12 is close to the second wall body 312. In the present application, part of the second wall body 312 is curved away from the air guide plate 10 to form a curved air guide wall surface 3121. In the case that the air guide plate 10 is opened, the air guide wall surface 3121 can guide the airflow to flow along the second air guide surface 12.

[0044] The air conditioner indoor unit 1000 according to the present application can make the airflow flow along the second air guide surface 12 of the air guide plate 10 by arranging the air guide wall surface 3121, so as to avoid the stagnation and backflow of the airflow at the second air guide surface 12 of the air guide plate 10, and reduce the possibility of condensation of moisture in the air. In the present application, when the air guide plate 10 is at the minimum opening angle, the air guide wall surface 3121 can guide the airflow to the second air guide surface 12, so that the airflow can flow smoothly from the air outlet 320 to the outside. When the air guide plate 10 is at the maximum opening angle, the airflow can also flow smoothly from the air outlet 320 to the outside. The present application can not only improve the efficiency and performance of the air conditioning system, but also avoid unnecessary troubles caused by condensation, and ensure the normal operation and service life of the air conditioning equipment.

[0045] In some structural forms, the second wall 312 of the air outlet 310 can be formed on the outer side of the water pan, and the first wall 311 of the air outlet 310 can be formed on the inner side of the shell 200. It can be understood that the water pan is used to collect the condensed water generated during the heat exchange operation of the heat exchanger 500 and discharge the condensed water. The water pan is arranged at the bottom of the heat exchanger 500. Thus, after the water pan is installed with the shell 200, the air outlet 310 described above can be formed. In other embodiments, the second wall 312 of the air outlet 310 can also be formed on the panel 220, or the water pan can be integrally formed with the panel 220. In this application, the specific forming mode of the air outlet 310 is not limited.

[0046] In some embodiments of the present application, referring to FIG. 7, the air guide wall 3121 is recessed to form an air guide cavity 3122. When the air guide plate 10 is opened, the air guide plate 10 swings between the maximum swing angle position and the minimum swing angle position. FIG. 3 shows that the air guide plate 10 is in the maximum swing angle position, and FIG. 7 shows that the air guide plate 10 is in the minimum swing angle position. When the air guide plate 10 is in the maximum swing angle position, the end of the air guide plate 10 close to the second wall 312 is above the air guide cavity 3122, and when the air guide plate 10 is in the minimum swing angle position, the end of the air guide plate 10 close to the second wall 312 is in the air guide cavity 3122. When the air guide plate 10 is in the maximum swing angle position, the extension directions of the first air guide surface 11 and the second air guide surface 12 in the air guide plate 10 are close to the air outlet direction of the air outlet 310. At this time, the end of the air guide plate 10 close to the second wall 312 is above the air guide cavity 3122, and the airflow can flow along the first air guide surface 11 and the second air guide surface 12 more smoothly, avoiding condensation. In this process, the airflow generated by the air guide cavity 3122 does not have a negative impact on this process. When the air guide plate 10 is in the minimum swing angle position, since the end of the air guide plate 10 close to the second wall 312 is in the air guide cavity 3122, the airflow in the air guide cavity 3122 has contacted the second air guide surface 12 before flowing out of the air guide cavity 3122, and can flow out along the second air guide surface 12 as much as possible. Therefore, in this process, the air guide cavity 3122 can make the airflow wrap the second air guide surface 12 of the air guide plate 10 as much as possible, and the gas can flow out along the second air guide surface 12.

[0047] Further, please refer to FIG. 3 and FIG. 7, the profile line of the second air guide surface 12 intersected with the vertical section perpendicular to the axial direction of the cross-flow fan 3 includes an end point A and an end point B, wherein the end point A is located above the end point B, and the end point C is located at one end of the second wall body 312 in the profile line of the second air guide surface 12 intersected with the vertical section perpendicular to the axial direction of the cross-flow fan 3; the distance between the end point C and the line connecting the end point A and the end point B is 0.1mm-3mm. By such arrangement, please refer to FIG. 4, it can ensure that the airflow flows smoothly, reduce the resistance and turbulence phenomenon, and improve the efficiency of the airflow guiding of the air guide plate 10.

[0048] In some embodiments of the present application, please refer to FIG. 4 and FIG. 5, the minimum distance between the end point B and the second air guide surface 12 is 3mm-5mm. By such arrangement, it can ensure that the airflow flows smoothly, reduce the resistance and turbulence phenomenon, and improve the efficiency of the airflow guiding.

[0049] In some embodiments of the present application, please refer to FIG. 7, the minimum distance between the end point C and the air guide wall surface 3121 is 3mm-5mm. By such arrangement, it can ensure that the airflow flows effectively, and by maintaining a certain distance, it can ensure that the airflow flows effectively through the air guide wall surface 3121, and can reduce the friction and resistance between the airflow and the air guide wall surface 3121, which is helpful to reduce the energy loss, improve the efficiency of the air conditioning system, save energy and reduce the operating cost.

[0050] Please refer to FIG. 3, the second air guide surface 12 is a curved surface, and one end of the air guide plate 10 close to the second wall body 312 is curved towards the direction away from the air outlet 320, so that the curvature of the part of the second air guide surface 12 close to the second wall body 312 is similar to the curvature of the cavity wall of the air guide cavity 3122. By such arrangement, it can make the airflow more closely adhere to the cavity wall of the air guide cavity 3122 and the second air guide surface 12, increase the surface area of the airflow in contact with the solid surface, and thus enhance the influence of the wall attachment effect. It should be noted that the wall attachment effect is a common phenomenon in fluid flow process, which refers to the phenomenon that the fluid stagnates near the surface due to the action of viscous force when the fluid contacts the solid surface. By such arrangement, the present application can make the airflow form a relatively stable flow state at the surface of the second air guide surface 12, reduce the occurrence of turbulence, and thus improve the stability of the fluid, which is conducive to reducing the turbulence loss of the fluid system and improving the stability and efficiency of the airflow flow.

[0051] Further, the curvature of the entire second air guide surface 12 is similar to the curvature of the cavity wall of the air guide cavity 3122. By making the curvature of the second air guide surface 12 similar to the curvature of the cavity wall of the air guide cavity 3122, it can make the airflow flow more stably near the air guide plate 10 and more closely along the curved surface.

[0052] Please refer to FIG. 8, the end of the first air guide surface 11 away from the second wall body 312 includes an air guide tail section 11a, wherein the air guide tail section 11a is gradually arranged closer to the second air guide surface 12 in the direction away from the second wall body 312, so that the spacing between the air guide tail section 11a and the second air guide surface 12 gradually decreases. It can be understood that, due to the certain thickness of the air guide plate 10, the spacing between the first air guide surface 11 and the second air guide surface 12 is relatively large, and after the airflow passes through the first air guide surface 11 and the second air guide surface 12, airflow vortexes are easily generated at the end of the air guide plate 10. The air guide tail section 11a provided in the present application can guide the airflow on the opposite sides of the air guide plate 10 to be gradually and smoothly combined, improve the flow state of the airflow, and reduce the loss and dissipation of wind energy.

[0053] In some embodiments of the present application, please refer to FIG. 7, the second wall body 312 further includes a flow guide surface 3123 connected between the air guide wall surface 3121 and the air outlet 320. The flow guide surface 3123 is formed as an arc surface, and the curvature direction of the flow guide surface 3123 is opposite to that of the air guide wall surface 3121. The arc-shaped flow guide surface 3123 can effectively guide the airflow from the air guide wall surface 3121 to the air outlet 320, and make the airflow spread more widely. The opposite curvature direction of the flow guide surface 3123 and the air guide wall surface 3121 can make the airflow spread more evenly when passing through the air outlet 320, covering a wider range. Expanding the airflow spreading range of the air outlet 320 can improve the comfort of the air conditioning system. Uniform airflow distribution can avoid local high or low temperature conditions, provide more uniform indoor temperature and humidity, and enhance the user's comfort. Expanding the airflow spreading range can help improve the ventilation effect in the space. By making the airflow cover a wider range, air convection and fresh air delivery can be more effectively achieved, indoor air quality can be improved, and indoor air flow and circulation can be promoted.

[0054] Further, the flow guide surface 3123 has a starting endpoint and a terminal endpoint, wherein the starting endpoint of the flow guide surface 3123 can coincide with the endpoint B of the air guide wall surface 3121, and in the front-rear direction YY, the terminal endpoint of the flow guide surface 3123 is farther away from the first wall body 311 than the starting endpoint. In this way, the airflow spreading range can be further improved.

[0055] In some embodiments of the present application, the distance between the first wall body 311 and the second wall body 312 is gradually increased in the direction close to the air outlet 320. In this way, the flow state and speed of the airflow can be changed, so that the gas can be in a state of pressure reduction, expansion and dispersion during the flow process, thereby making the airflow achieve better distribution and uniformity.

[0056] In some embodiments of the present application, the second air guide surface 12 is a curved surface that is outwardly arched. The curved second air guide surface 12 can more effectively guide the airflow to flow along the surface thereof. Since the curved surface can more accurately control the flow direction and speed of the airflow, the effect of guiding the airflow can be improved, and the air flow can be smoother. Compared with the flat second air guide surface 12, the curved second air guide surface 12 can reduce the resistance of the airflow. The curved design can reduce the friction between the airflow and the second air guide surface 12, thereby reducing the energy consumption of the system and improving the efficiency of the air conditioning system. Of course, the first air guide surface 11 can be designed as a concave curved surface, so that the effect of guiding the airflow is more smooth.

[0057] To change the direction of the airflow along the up-down direction ZZ and along the left-right direction XX, please refer to FIG. 8 and FIG. 9, the air guide structure 100 further comprises a plurality of swing blades 30 and a driving assembly (not shown in the figure) for driving the air guide panel 10 and the plurality of swing blades 30 to swing. Among them, the air guide panel 10 can swing along the up-down direction ZZ, and the swing blades 30 can swing along the left-right direction XX. In the embodiments of the present application, the driving assembly comprises a first driving member, a second driving member and a mounting seat.

[0058] The mounting seat is connected with the shell 200 to provide a mounting base for the first driving member and the second driving member. The mounting seat can be made of metal to ensure structural strength and support; alternatively, the mounting seat can also be made of plastic to facilitate production and lightweight. Optionally, the mounting seat is substantially disc-shaped and has a mounting groove in the middle portion, and the first driving member and the second driving member are fixed in the mounting groove. The two sides of the mounting seat can be connected with the shell 200 by means of detachable connection such as screw connection or buckle connection, which ensures the stability of the mounting seat while facilitating disassembly and assembly.

[0059] The first driving member is connected with the air guide panel 10 and can drive the air guide panel 10 to swing along the up-down direction ZZ. For example, the first driving member can be a stepper motor, which facilitates accurate control of the swing angle of the air guide panel 10. Specifically, the first driving member has an output end that can rotate about an axis extending along the left-right direction XX, and the air guide panel 10 is connected with the output end of the first driving member, so that when the output end of the first driving member rotates about the axis, the air guide panel 10 also rotates about the axis extending along the left-right direction XX, thereby realizing up-down direction swing.

[0060] The second driving member is connected with the plurality of swing blades 30 and can drive the plurality of swing blades 30 to swing along the left-right direction XX. Exemplarily, the second driving member can be a linear motor or a pneumatic cylinder and has an output end reciprocable along the left-right direction XX, and the plurality of swing blades 30 are connected with the output end to swing reciprocally along the left-right direction XX. Alternatively, the second driving member can also be a stepping motor having a rotatable output end, and the plurality of swing blades 30 are driven to swing by transmission, so as to realize swing in the left-right direction. The embodiments of the present application do not limit this.

[0061] The air deflector 10 can be integrally injection molded by plastic, has high production efficiency and is light in weight and convenient to drive. As shown in FIG. 4, the air deflector 10 has a plate body structure substantially in the shape of a rectangle, one end of which is connected with the output end of the first driving member to rotate with the output end of the first driving member and change the included angle between the air deflector 10 and the airflow at the air outlet 320, so as to swing up and down. For example, in the embodiment shown in FIG. 3, the air outlet 320 is arranged to open downwardly toward the housing 200, and if the air deflector 10 rotates clockwise about the axis extending along the left-right direction XX, the included angle between the air deflector 10 and the airflow at the air outlet 320 increases, the air deflector 10 blocks the airflow to the lower side of the housing 200 to some extent, and the airflow flows along the air deflector 10 toward the front side of the housing 200. Conversely, if the air deflector 10 rotates counterclockwise about the axis extending along the left-right direction XX, the included angle between the air deflector 10 and the airflow at the air outlet 320 decreases, and the airflow can flow along the air deflector 10 toward the lower side of the housing 200. It can be understood that the greater the included angle between the air deflector 10 and the airflow, the greater the included angle between the airflow direction and the up-down direction ZZ, and the more the airflow flows toward the front side of the housing 200; and the smaller the included angle between the air deflector 10 and the airflow, the smaller the included angle between the airflow direction and the up-down direction ZZ, and the more the airflow flows toward the lower side of the housing 200. Further, to improve the stability of the air deflection structure 100, the end of the air deflector 10 away from the mounting seat is provided with a connecting shaft rotatably connected with the housing 200. In this way, by swinging of the air deflector 10, the flow direction of the airflow at the air outlet 320 in the pitch direction can be adjusted, and the coverage range of the airflow at the air outlet 320 can be adjusted.

[0062] A plurality of swing blades 30 are rotationally connected to one side of the air deflector 10 and are arranged at intervals in the left-right direction XX. The swing blades 30 are substantially plate-shaped and can be made of plastic or the like. The side of the swing blades 30 close to the air deflector 10 is connected to the air deflector 10 by a rotation shaft, and the swing blades 30 are connected to the output end of the second driving member. When the output end of the second driving member moves, the swing blades 30 can swing about the rotation shaft as the center of rotation with respect to the air deflector 10. The plurality of swing blades 30 are arranged at intervals to divide the airflow on one side of the air deflector 10 into a plurality of parts, and when the plurality of swing blades 30 rotate with respect to the air deflector 10, the airflow moves along the swing blades to change direction. Exemplarily, when the plurality of swing blades 30 are parallel to the front-rear direction YY, the airflow flowing out of the air outlet 320 can flow substantially in the front-rear direction YY; if the plurality of swing blades 30 swing to the left with respect to the air deflector 10, the airflow flowing out of the air outlet 320 flows to the left side of the air outlet 320, and if the plurality of swing blades 30 swing to the right with respect to the air deflector 10, the airflow flowing out of the air outlet 320 flows to the right side of the air outlet 320. In this way, the plurality of swing blades 30 are arranged to achieve air sweeping in the left-right direction XX.

[0063] It should be noted that the first driving member and the second driving member are independently operable, and thus can be:

[0064] The first driving member is in operation and the second driving member is not in operation, at which time the air deflector 10 swings, the plurality of swing blades 30 move with the air deflector 10 in the swing direction thereof, and the plurality of swing blades 30 are stationary with respect to the air deflector 10, so as to adjust the pitch angle of the airflow in the case of a fixed left-right direction;

[0065] The first driving member is not in operation and the second driving member is in operation, at which time the air deflector 10 is stationary, the plurality of swing blades 30 swing left and right with respect to the air deflector 10, so as to adjust the left-right direction of the airflow in the case of a fixed pitch angle;

[0066] Alternatively, the first driving member and the second driving member are in operation at the same time, at which time the air deflector 10 swings, the plurality of swing blades 30 move with the air deflector 10 in the swing direction thereof, and the plurality of swing blades 30 swing left and right with respect to the air deflector 10, so as to simultaneously adjust the pitch angle and the left-right direction of the airflow.

[0067] The plurality of swing blades 30 are connected with the air deflector 10, the space interval between the plurality of swing blades 30 and the air deflector 10 is cancelled, the structure is more compact, thereby the space utilization can be improved, the space occupied by the plurality of swing blades 30 and the air deflector 10 is reduced, and the ultra-thin design of the air conditioner indoor unit 1000 is facilitated. Since the plurality of air deflector blades are rotationally connected with the air deflector 10, and the air deflector 10 and the plurality of swing blades 30 are driven by the first driving member and the second driving member respectively, when the air deflector 10 swings, the plurality of swing blades 30 can also swing relative to the air deflector 10 to change the flow direction of the air flow in front of the air deflector 10, thereby ensuring the working performance of the air deflector 10 and the swing blades 30 under the premise of reducing the occupied space.

[0068] In the related art, for a household user, the indoor space of a room is relatively small, and the height of a ceiling is small. When the ceiling machine is installed on the ceiling, the ceiling machine is stacked in the height direction due to the height difference between the positions where the air inlet and the air outlet are arranged, and the indoor space is occupied.

[0069] To solve the above problems, referring to FIGS. 1, 2 and 10, the air conditioner indoor unit 1000 provided by the present application also includes a shell 200, a heat exchanger 500 and a cross-flow fan 3.

[0070] In some embodiments, the shell 200 is in the shape of a cuboid, and the general shape can have a recess or a protrusion according to actual needs. The shell 200 can be made of a hard material such as sheet metal or a plastic material, which can effectively protect the internal structure of the air conditioner indoor unit 1000.

[0071] The shell 200 is provided with an air outlet 320 and an air inlet 330 at the bottom surface, and a air duct 300 is formed in the shell 200 to communicate the air inlet 330 and the air outlet 320. The air inlet 330 and the air outlet 320 extend in the length direction of the shell 200 and are arranged at intervals in the width direction of the shell 200. Since the air inlet 330 and the air outlet 320 are located at the bottom surface of the shell 200, that is, the air inlet surface and the air outlet surface are arranged in the same plane, the air conditioner indoor unit 1000 is prevented from being stacked in the height direction due to the stacking of the heat exchanger 500 and the cross-flow fan 3 and other components in the shell 200, thereby avoiding the structure being bulky and improving the compactness of the overall structure of the air conditioner indoor unit 1000. At the same time, the flat design of the air conditioner indoor unit 1000 is facilitated, the air conditioner indoor unit 1000 can be installed in the ceiling space, and the product can have a simple and beautiful appearance.

[0072] The heat exchanger 500 is arranged in the air duct 300, and air flows into the air duct 300 from the return air inlet 330. When the air conditioner indoor unit 1000 is in a cooling state, the heat exchanger 500 is an evaporator, and the refrigerant flowing in the evaporator absorbs heat in the air flowing around the evaporator from the return air inlet 330, so that the temperature of the air is reduced to form cool air. Of course, the heat exchanger 500 can also be a condenser, and the present application does not limit this. The heat exchanger 500 is arranged obliquely in the shell 200, and the included angle between the heat exchanger 500 and the return air inlet 330 is an acute angle. Compared with the technical arrangement in which the heat exchanger 500 is perpendicular to the bottom plate, the oblique arrangement of the heat exchanger 500 is beneficial to increasing the windward area of the heat exchanger 500, so that the air flowing into the heat exchanger 500 from the return air inlet 330 can be fully heat-exchanged with the heat exchanger 500.

[0073] The cross-flow fan 3 is arranged in the air duct 300 and on the leeward side of the heat exchanger 500. It has the advantages of small radial size, low speed, low noise, uniform air outlet, and the like, and the axial length can be arbitrarily extended without affecting the gas flow state. The rotation of the cross-flow fan 3 forms a low pressure to drive the air flow from the return air inlet 330 into the air duct 300 and the heat exchanger 500 to exchange heat. The heat-exchanged air flows to the cross-flow fan 3, which drives the air flow to blow out from the air outlet 320, and the heat-exchanged air reenters the indoor space to adjust the indoor temperature. In the embodiment of the present application, the cross-flow fan 3 has one, but is not limited to this. That is, the cross-flow fan 3 can also be two, and the two cross-flow fans 3 can be arranged side by side in the same length direction, and the present application does not limit this.

[0074] In some embodiments, the shell 200 includes a shell body 210, a bottom plate 250, a water collecting tray 260, a bottom plate (not shown), and side plates 270. The shell body 210 and the bottom plate are arranged opposite to each other in the up-down direction of the air conditioner indoor unit 1000, and the bottom surface of the shell body 210 is spaced apart to form the air outlet 320 and the return air inlet 330. The shell body 210 is also provided with a plurality of hooks, which are symmetrically arranged, for hanging the air conditioner indoor unit 1000 on the top of the indoor environment, so that the bottom plate faces the personnel activity area below the indoor space, and the air is blown out from the air outlet 320 to the bottom of the bottom plate. The side plates 270 are arranged opposite to each other on the left and right sides of the air conditioner indoor unit 1000 in the length direction, to protect the internal structure of the air conditioner indoor unit 1000 in the side direction.

[0075] The bottom plate 250 is installed inside the shell body 210 and defines the air duct 300. Specifically, the bottom plate 250 has an inclined extending wall and extends from the air inlet side of the cross-flow fan 3 to the air outlet side, so that a part of the top of the bottom plate 250 can shield the heat exchanger 500, so that the heat exchanger 500 is in communication with the air duct 300 of the air inlet side of the cross-flow fan 3, and the other part also participates in the formation of the air duct 300 of the air outlet side of the cross-flow fan 3, thereby defining the entire air duct 300. This arrangement can reduce the number of parts and improve the sealing of the air duct 300 and improve the air supply efficiency. At the same time, the inclined extension of the bottom plate 250 also changes the route of the air duct 300, facilitating downward air outlet to meet the layout needs of the air conditioner indoor unit 1000.

[0076] The water collecting tray 260 is arranged in the air duct 300, connected below the bottom plate 250, and spaced apart from the air outlet 320 and the air return port 330, and the water collecting tray 260 is arranged below the heat exchanger 500 and on the side of the heat exchanger 500 close to the bottom plate. The heat exchanger 500 also has a bottom end portion facing the bottom plate, and the water collecting tray 260 is arranged below the bottom end portion of the heat exchanger 500. The condensate water formed on the surface of the heat exchanger 500 flows along the surface of the heat exchanger 500 to the bottom end portion of the heat exchanger 500 under the action of gravity, and then flows into the water collecting tray 260. The water collecting tray 260 can reduce the probability of condensate water accumulating on the surface of the heat exchanger 500, receive condensate water, prevent water blowing phenomenon, and prevent condensate water from overflowing to cause safety hazards such as leakage of the air conditioner indoor unit 1000.

[0077] In addition, the cross-flow fan 3 is arranged between the bottom plate 250 and the water collecting tray 260, and the shell 200 further forms the first volute tongue 230 and the second volute tongue 240 arranged in the air duct 300. The first volute tongue 230 and the second volute tongue 240 can be separately arranged, and of course, they can also be integrally formed. The air duct 300 includes an air return area 340 between the cross-flow fan 3 and the heat exchanger 500 and an air outlet area 350 between the cross-flow fan 3 and the air outlet 320. The first volute tongue 230 is arranged in the air return area 340 and adjacent to the upper side of the cross-flow fan 3, and is used to disperse the airflow entering the air return area 340 from the air return port 330, so that the airflow circulates in the air return area 340 to drive the airflow as much as possible, thereby improving the aerodynamic efficiency. The second volute tongue 240 is arranged in the air outlet area 350 and adjacent to the lower side of the cross-flow fan 3, and is used to divide the airflow sent by the cross-flow fan 3 to the air outlet 320, so that the airflow can flow smoothly to the air outlet 320.

[0078] Specifically, the first volute tongue 230 is connected with the bottom plate 250, the second volute tongue 240 is installed on the water pan 260 and extends towards the lower side of the cross-flow fan 3, and is arranged on the side of the cross-flow fan 3 away from the heat exchanger 500. The connection mode of the second volute tongue 240 and the water pan 260 can be fixed connection or detachable connection, and the detachable connection includes but is not limited to screw connection, clamping connection and the like. The first volute tongue 230 and the second volute tongue 240 are arranged in the air duct 300 and relative to the blades 34 of the cross-flow fan 3, and can guide the airflow blown out of the air duct 300, so as to adjust the air supply direction of the air conditioner indoor unit 1000.

[0079] In some embodiments, referring to FIGS. 2 and 10, the cross-flow fan 3 is generally cylindrical, including two end covers 31 arranged opposite in the axial direction of the cross-flow fan 3, and a plurality of fan segments 32 connected in sequence along the axial direction of the cross-flow fan 3 between the two end covers 31. Each fan segment 32 includes a partition plate 33 and a plurality of blades 34 arranged circumferentially along the partition plate 33.

[0080] In the prior art, the rotating noise of the cross-flow fan 3 is large. In the conventional arrangement, the blades 34 of each fan segment 32 are equally spaced circumferentially along the partition plate 33 of the fan segment 32, and there is no misalignment angle between the blades 34 of adjacent fan segments 32 in the axial direction of the cross-flow fan 3. As a result, each blade 34 passes through the first volute tongue 230 or the second volute tongue 240 within the same time interval in the circumferential direction, and the same blade 34 of each segment passes through the first volute tongue 230 or the second volute tongue 240 at the same time in the axial direction. Therefore, each blade 34 has the same rotating frequency and pressure pulsation frequency. The noise of the same frequency is superimposed on each other in space and time, resulting in large rotating noise. Thus, the cross-flow fan 3 has poor sound quality, the rotating fundamental frequency noise is prominent, the N times frequency noise of the fundamental frequency has a high single peak value close to the total value, and the experience is poor and obvious in terms of hearing.

[0081] In the embodiments of the present application, the plurality of blades 34 of each fan segment 32 are arranged unequally spaced in the circumferential direction of the partition plate 33, and there is a non-zero misalignment angle between the two blades 34 of two adjacent fan segments 32 in the extension direction of the two blades 34 and the axis of the cross-flow fan 3. As a result, when each blade 34 passes through the first volute tongue 230 or the second volute tongue 240, there is a difference in impact strength and phase of the first volute tongue 230 or the second volute tongue 240, causing mutual interference between harmonics. The frequency spectrum characteristics show discrete characteristics, which can further enhance the interference between different frequency noises, greatly reduce the discrete frequency noises, and thus achieve the effect of reducing the working noise of the air conditioner indoor unit 1000.

[0082] Please refer to FIG. 11, the blade 34 has a proximal end 341 and a distal end 342, the proximal end 341 is close to the axis of the cross-flow fan 3, and the distal end 342 is away from the axis of the cross-flow fan 3, and the line connecting the proximal end 341 and the distal end 342 is the chord length of the blade 34. Among them, the distal end 342 includes a plurality of spaced apart air outlet portions (not shown in the figure), and the air outlet portions are arranged in a toothed structure, and the air outlet portions are configured to make the flow state of the airflow at the air outlet portions transition from a laminar flow state to a turbulent flow state. Moreover, the air outlet portions also have a bottom wall along the recess direction, and each bottom wall has the same distance from the axis of the cross-flow fan 3. Thus, in the mold cavity of the mold for producing the blade 34, a plurality of ribs with the same size can be arranged, and the ribs are equidistantly distributed between the ribs, thereby making the mold design and structure simpler and reducing the cost of the mold. The cross-sectional shape of each air outlet portion parallel to the length direction of the blade 34 is rectangular, triangular or trapezoidal, so that the shape is more regular and easy to process the air outlet portions.

[0083] It can be understood that along the thickness direction of the blade 34, the airflow flows through the space on the opposite sides of the distal end 342. Based on the arrangement of the air outlet portions, the airflow on one side of the space flows to the airflow on the other side of the space to play a role in airflow supplement, thereby making the flow state of the airflow at the air outlet portions transition from a laminar flow state to a turbulent flow state, so that during the airflow flowing to the first volute tongue 230 and the second volute tongue 240, the large vortex in the wake of the airflow can become a plurality of small vortexes in advance, thereby not only reducing the intensity of the noise generated by the airflow during the airflow flowing to the first volute tongue 230 and the second volute tongue 240, but also reducing the intensity of the noise generated by the plurality of small vortexes impacting the first volute tongue 230 and the second volute tongue 240 compared to the large vortex impacting the first volute tongue 230 and the second volute tongue 240.

[0084] Specifically, the air outlet portions of different blades 34 are arranged in a circle along the circumferential direction of the cross-flow fan 3, that is, the air outlet portions of different blades 34 are arranged opposite to each other along the circumferential direction of the cross-flow fan 3, and a plurality of circles of air outlet portions are arranged along the axis of the cross-flow fan 3.

[0085] On the one hand, from the perspective of noise reduction, if the air outlet portions of different blades 34 are not arranged opposite to each other along the circumferential direction of the cross-flow fan 3, for example, along the circumferential direction of the cross-flow fan 3, the air outlet portions of one blade 34 are opposite to the air outlet portions of another blade 34, which will cause the difference in the impact phase of the cross-flow fan 3 on the volute tongue 310 to be small during rapid rotation, and there is still a small possibility of resonance. Therefore, by arranging the air outlet portions of different blades 34 in a circle along the circumferential direction of the cross-flow fan 3, the difference in the impact phase of the cross-flow fan 3 on the volute tongue 310 can be large during rapid rotation, thereby further reducing the possibility of resonance and more effectively reducing the intensity of the noise.

[0086] On the other hand, from the perspective of production and manufacturing, when the blades 34 are made of plastic and are manufactured by injection molding, a plurality of spaced ribs can be provided in the mold cavity of the mold for producing the blades 34, and each rib can be configured in a ring shape. In this way, the plurality of ribs realize the molding of each circle of cuts of the plurality of blades 34, and when the plurality of cuts belonging to the same circle are opposite in the circumferential direction, the corresponding rib is a continuous and non-interval rib body as a whole, thereby making the structural design of the mold simpler, reducing the production cost of the mold, and facilitating demolding and injection molding production.

[0087] In other embodiments, the cuts of different blades 34 can also be arranged in the circumferential direction of the cross-flow fan 3 without being in a circle, that is, along the circumferential direction of the cross-flow fan 3, the cut of one of the adjacent two blades 34 is opposite to the air outlet portion of the other blade 34. The present embodiment does not limit this.

[0088] In some embodiments, as shown in FIG. 11, there is a non-zero misalignment angle a between the extensions of the chord lengths of the adjacent two blades 34 on the hub 32 of the adjacent two fans. In this way, the time interval of the adjacent two blades 34 passing through the first or second volute tongue 230 or 240 on the hub 32 of the adjacent two fans is not equal. Moreover, the angle between the extension of the chord length of any blade 34 on one of the hubs 32 and the axis is a1, and similarly, the angle between the extension of the chord length of another blade 34 adjacent to the blade 34 with a1 on the other hub 32 and the axis is a2. The above misalignment angle a is derived according to the formula:

[0089] a = |a2-a1| ∈ [4, 6]°, and the misalignment angle a is 4°-6°.

[0090] If the misalignment angle a is greater than 6°, the angle between the adjacent two blades 34 will be too large, resulting in a reduction in the number of blades 34 that can be arranged under the same diameter of the hub 32, and thus reducing the air supply efficiency of the cross-flow fan 3. If the misalignment angle a is less than 4°, the difference in the time interval of the blades 34 passing through the first or second volute tongue 230 or 240 is not obvious, and the noise improvement effect is also not obvious. Considering the number of mold sets in the production and manufacturing process of the cross-flow fan 3, the misalignment angle a is generally taken as a certain value, and according to the formula: a = 45° / number of blades, the misalignment angle a can be selected as 4°, 5° or 6°.

[0091] And, on the same wind wheel section 32, there is a non-zero angle θ between the extensions of the chord lengths of two adjacent blades 34, so that the time interval of two adjacent blades 34 passing through the first or second volute tongue 230 or 240 is not equal on the same wind wheel section 32. Further, the angle θ of each adjacent two blades 34 in the circumferential direction of the same wind wheel section 32 is not equal, so the angle θ is deduced according to the formula:

[0092] Average blade angle n is the number of blades. The blades are numbered 1, 2, 3, …, n. The blade angle θ1 is the angle between the adjacent blade 1 and blade 2, and so on. The blade angle θ is the angle between the blade 35 and the blade 1. Random numbers R1, R2, R3, …, Rn are generated, R∈[-m, n], then Let Make correction, θ1=θ1'+k, θ2=θ2'+k, …, θn=θn'+k. Above, the angle θ is 8°-12°, thereby completing the unequal distance distribution of the blades 34 in the circumferential direction.

[0093] The existence of the above misalignment angle α and the angle θ makes the time interval of each blade 34 passing through the first or second volute tongue 230 or 240 not equal, so that each blade 34 has different rotation frequency and pressure pulsation frequency, and further makes the rotational noise dispersed in time and space, so that the size and tone of the noise can be improved, thereby improving the user experience. During the operation of the cross-flow fan 3, the noise generated not only includes the pulsating pressure on the surface of the blade 34, but also includes the pulsating pressure on the surface of the chassis 250. The unequal distance arrangement of the blades 34 makes the impact intensity and phase of each blade 34 on the first or second volute tongue 230 or 240 different, and the frequency spectrum characteristics are discrete, the noise between different frequencies interferes with each other, and resonance is not easy to occur, thereby effectively reducing the noise intensity.

[0094] In the embodiment of the application, according to the above formula, the number of wind wheel sections 32 is 8-11, and the number of blades 34 is 30-45. The number of blades 34 is an odd number, preferably a prime number, so that the frequency of the vibration generated during the rotation of the fan is more co-prime with the frequency of other vibrations in the surrounding environment, reducing the resonance between the blades 34 and the surrounding environment, and reducing the rotational noise of the cross-flow fan 3. Therefore, the number of blades 34 can be selected as 35, 37 or 39, at which the effect of reducing the working noise of the cross-flow fan 3 is best. Since the misalignment angle α is 4°-6° and the angle θ is 8°-12°, the number of wind wheel sections 32 is 9, the number of blades 34 is 35, the misalignment angle α is 5°, and the angle θ is 10°. In a specific setting form, the specific blade type parameters of the blades 34 of the application are shown in the following table:

[0095] Wherein, the average radius of the blade 34 is the average of the radius of the leading edge of the blade 34 and the trailing edge of the blade 34, and the distance between the intersection points of the same position of two adjacent blades 34 and the average radius circle. Since the blades 34 are not equally distributed in the circumferential direction, the average radius under the average adjacent angle of the blade 34 is taken.

[0096] According to the specific data of the blade type parameters of the cross-flow fan 3, the experimental results of the velocity field cloud map of the CFD simulation of the cross-flow fan 3 at the same speed are shown in FIG. 13b. There is a vortex on the inner side of the cross-flow fan 3 that can control the flow of the entire airflow. Compared with the velocity field cloud map of the ordinary fan at the same speed shown in FIG. 13a, the size of the eccentric vortex of the cross-flow fan 3 of the embodiment of the application is obviously smaller, and the calculation aerodynamic efficiency is improved by 1 percentage point.

[0097] FIG. 14 is a comparison of the frequency spectrum of the ordinary fan and the cross-flow fan 3 of the application at the same speed. As can be seen from FIG. 14, compared with the ordinary fan, the total sound pressure of the cross-flow fan 3 of the application is lower, the sound pressure difference between adjacent frequency bands is lower, most of which is broadband noise, and the sound quality is better, that is, the effect of reducing the noise of the cross-flow fan 3 can be achieved.

[0098] Please refer to FIG. 2 again. In some embodiments, the motor 40 is arranged in the shell 200, and the outer side of the end cover 31 is provided with a rotating shaft 41 connected with the motor 40. The rotating shaft 41 rotates together with the hub 32 of the fan under the driving of the motor 40, and plays a supporting role while being used for installing the cross-flow fan 3 in the shell 200.

[0099] The above is only an optional embodiment of the application, and does not limit the patent scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields based on the application concept, and the contents of the specification and drawings are included in the patent protection scope of the application.

Claims

1. An air conditioner indoor unit characterized by comprising: The application relates to an air conditioner, which comprises a shell, a cross-flow fan and a heat exchanger, and a guide structure. The shell is provided with an air duct, and a return air outlet and an air outlet are arranged at the bottom of the shell and spaced apart from the air duct. The air duct comprises an air outlet part connected to the air outlet. The guide structure comprises a guide plate, which is rotatably connected to the shell and located between the first wall body and the second wall body. The guide plate has a first guide surface and a second guide surface arranged opposite to each other in the thickness direction of the guide plate. 2.The indoor unit of the air conditioner according to claim 1, characterized by, When the guide plate is opened, the first guide surface faces the first wall body, and the second guide surface faces the second wall body. Part of the second wall body is curved in the direction away from the guide plate to form a curved guide wall surface. 3.The indoor unit of the air conditioner according to claim 2, characterized by, When the guide plate is opened, the guide plate swings between a maximum swing angle position and a minimum swing angle position. 4.The indoor unit of the air conditioner according to claim 3, characterized by, When the guide plate is at the maximum swing angle position, one end of the guide plate close to the second wall body is located above the guide cavity. 5.The indoor unit of the air conditioner according to claim 3, characterized in that, When the guide plate is at the minimum swing angle position, one end of the guide plate close to the second wall body is located in the guide cavity. 6.The indoor unit of the air conditioner according to claim 2, characterized by, The second guide surface is curved, and one end of the guide plate close to the second wall body is curved in the direction away from the air outlet. The curvature of the second guide surface close to the second wall body is similar to the curvature of the cavity wall of the guide cavity. 7.The indoor unit of the air conditioner according to claim 6, characterized by, The curvature of the entire second guide surface is similar to the curvature of the cavity wall of the guide cavity. 8.The indoor unit of the air conditioner according to claim 6, characterized in that, The end of the first guide surface away from the second wall body comprises a guide tail section. 9.The indoor unit of the air conditioner according to claim 1, characterized by, The guide tail section gradually approaches the second guide surface in the direction away from the second wall body, so that the distance between the guide tail section and the second guide surface gradually decreases. 10.The indoor unit of the air conditioner according to any one of claims 1 to 9, characterized by The profile line obtained by intersecting the guide wall surface with a vertical section perpendicular to the axial direction of the cross-flow fan comprises end point A and end point B. The end point A is located above the end point B. The end point close to the second wall body in the profile line obtained by intersecting the second guide surface with a vertical section perpendicular to the axial direction of the cross-flow fan is end point C. The distance between the end point C and the line connecting the end point A and the end point B is 3-5 mm. The minimum distance between the end point B and the second guide surface is 3-5 mm. The distance between the end point C and the guide wall surface is 0.1-3 mm. The second wall body further comprises a guide surface connected between the guide wall surface and the air outlet. The guide surface is formed as a curved surface, and the curvature direction of the guide surface is opposite to that of the guide wall surface. The distance between the first wall body and the second wall body gradually increases in the direction close to the air outlet. 11.The indoor unit of the air conditioner according to any one of claims 1 to 9, characterized by The cross-flow fan is located downstream of the heat exchanger and the air outlet is arranged between the cross-flow fan and the air outlet in the airflow direction of the air duct. 12.The indoor unit of the air conditioner according to any one of claims 1 to 9, characterized by The shell is further formed with a first volute tongue and a second volute tongue arranged in an arch shape in the air duct; The cross-flow fan is arranged between the heat exchanger and the air outlet, wherein the cross-flow fan comprises two end covers and a plurality of fan segments connected in sequence between the two end covers, each fan segment comprises a partition plate and a plurality of blades arranged circumferentially along the partition plate, the plurality of blades are arranged at unequal distances along the circumferential direction of the partition plate, and on two adjacent fan segments, the two adjacent blades have a non-zero misalignment angle between the extension direction of the two blades and the axis of the cross-flow fan, and the distal end of the blade in at least one fan segment is formed with a toothed structure; The air duct comprises a return air area between the cross-flow fan and the heat exchanger and an air outlet area between the cross-flow fan and the air outlet, the first volute tongue is arranged in the return air area and adjacent to the upper side of the cross-flow fan, and the second volute tongue is arranged in the air outlet area and adjacent to the lower side of the cross-flow fan. 13.The indoor unit of the air conditioner of claim 12, wherein, The blade has a proximal end and a distal end, the proximal end is close to the axis of the cross-flow fan, the distal end is away from the axis of the cross-flow fan, and the line connecting the proximal end and the distal end is the chord length of the blade; On two adjacent fan segments, the extension lines of the chord lengths of the two adjacent blades have a non-zero misalignment angle α; And / or, on the same fan segment, the extension lines of the chord lengths of the two adjacent blades have a non-zero included angle θ. 14.The indoor unit of the air conditioner of claim 13, wherein, The misalignment angle α is 4°-6°. 15.The indoor unit of the air conditioner of claim 13, wherein, The included angle θ is 8°-12°. 16.The indoor unit of the air conditioner of claim 13, wherein, In the circumferential direction of the same fan segment, the included angles θ of every two adjacent blades are not equal. 17.The indoor unit of the air conditioner of claim 13, wherein, The distal end comprises a plurality of spaced apart air outlets, and the two adjacent air outlets define a cutout to form the toothed structure. 18.The indoor unit of the air conditioner of claim 16, wherein, The cutout has a bottom wall in the recessed direction, and each bottom wall has the same distance from the axis of the cross-flow fan. 19.The indoor unit of the air conditioner of claim 12, wherein, The number of nodes of the fan segment is 8-11 nodes. 20.The indoor unit of claim 12, wherein, The number of blades is 30-45.

21. The air conditioning indoor unit according to any one of claims 12 to 20, characterized by, The shell comprises An outer shell with the air outlet and the air inlet spaced apart on the bottom surface; A bottom plate mounted inside the outer shell and defining the air duct; And A water pan arranged in the air duct, connected below the bottom plate, and spaced apart from the air outlet and the air inlet, and the cross-flow fan is arranged between the bottom plate and the water pan.

22. The air conditioning indoor unit according to any one of claims 12 to 11, characterized by The second volute tongue is mounted on the water pan and extends towards the lower side of the cross-flow fan; Wherein On two adjacent fan segments, the time interval of the two adjacent blades passing through the second volute tongue is not equal; And / or, on the same fan segment, the time interval of the two adjacent blades passing through the second volute tongue is not equal.

23. A heating and ventilation system, characterised in that, It comprises: An outdoor unit; And The air conditioner indoor unit according to any one of claims 1-22, and the air conditioner outdoor unit and the air conditioner indoor unit form a circulating flow path.

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