Indoor unit, and heating, ventilation and air conditioning device

Abstract

Embodiments of the present application disclose an indoor unit, and a heating, ventilation and air conditioning device. The indoor unit comprises a housing, an indoor heat exchanger and a grille assembly. An air inlet and an air outlet are provided at an interval in a bottom surface of the housing, and an air duct in communication with the air inlet and the air outlet is formed inside the housing. The indoor heat exchanger is obliquely disposed in the air duct, and at least part of the indoor heat exchanger is disposed opposite to the air inlet. The grille assembly is disposed at the air inlet, and comprises a plurality of grille strips arranged at intervals in an arc shape.

Description

Indoor unit and heating and ventilation equipment

[0001] The present application claims priority to the Chinese patent application No. 2024105236283, filed on April 28, 2024, entitled "Indoor unit and heating and ventilation equipment", and the Chinese patent application No. 2024209115866, filed on April 28, 2024, entitled "Indoor unit and heating and ventilation equipment", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

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

[0003] The heating and ventilation equipment can include an air conditioner, which is an indispensable electrical equipment in daily life. In the related art, an air inlet is provided with an air inlet grille. Due to the presence of the air inlet grille, and the air inlet grille is often provided in a flat shape, the air flow flowing into the air conditioner from the air inlet of the air conditioner is easily hindered, which reduces the air inlet amount of the air conditioner, thereby causing the aerodynamic efficiency of the air duct connected with the air inlet in the air conditioner to be low. SUMMARY

[0004] The present application provides an indoor unit and heating and ventilation equipment, which aims to improve the heat exchange efficiency of the indoor unit and the aerodynamic efficiency of the air duct.

[0005] The first aspect of the present application provides an indoor unit, which comprises a shell, an indoor heat exchanger and a grille assembly. The shell is provided with an air inlet and an air outlet at the bottom surface. The shell is internally formed with an air duct communicating with the air inlet and the air outlet. The indoor heat exchanger is arranged obliquely in the air duct, and at least part of the indoor heat exchanger is arranged opposite to the air inlet. The grille assembly is arranged at the air inlet, and the grille assembly comprises a plurality of grille bars arranged in an arc shape. The whole formed by the plurality of grille bars is convex outward in a direction away from the indoor heat exchanger.

[0006] Further, the plurality of grille bars are arranged along the front-rear direction of the indoor unit, and the whole formed by the plurality of grille bars gradually tilts towards the indoor unit in a direction from front to back.

[0007] Further, the grille assembly comprises a first grille bar group and a second grille bar group divided in equal length along the front-rear direction of the indoor unit. The first grille bar group is closer to the air outlet than the second grille bar group. The bending degree of the first grille bar group is smaller than that of the second grille bar group.

[0008] Further, the plurality of the grid bars are arranged along a front-rear direction of the indoor unit, the grid bars include a rear grid bar closest to a rear side of the indoor unit, and a front grid bar closest to a front side of the indoor unit, the front grid bar is lower than the rear grid bar, and a height difference between the front grid bar and the rear grid bar is not less than 10 mm and not more than 20 mm.

[0009] Further, a first included angle between a connecting straight line between the vertex of the front grid bar and the vertex of the rear grid bar and a horizontal plane is not less than 5 degrees and not more than 15 degrees.

[0010] Further, a second included angle between the connecting straight line between the vertex of the front grid bar and the vertex of the rear grid bar and a windward surface of the indoor heat exchanger is not less than 20 degrees and not more than 40 degrees.

[0011] Further, the first included angle between the connecting straight line between the vertex of the front grid bar and the vertex of the rear grid bar and the horizontal plane is not less than 5 degrees and not more than 15 degrees; and the second included angle between the connecting straight line between the vertex of the front grid bar and the vertex of the rear grid bar and the windward surface of the indoor heat exchanger is not less than 20 degrees and not more than 40 degrees.

[0012] Further, a third included angle between the windward surface of the indoor heat exchanger and the horizontal plane is not less than 25 degrees and not more than 45 degrees.

[0013] Further, the first included angle between the connecting straight line between the vertex of the front grid bar and the vertex of the rear grid bar and the horizontal plane is not less than 5 degrees and not more than 15 degrees; and the third included angle between the windward surface of the indoor heat exchanger and the horizontal plane is not less than 25 degrees and not more than 45 degrees.

[0014] Further, the second included angle between the connecting straight line between the vertex of the front grid bar and the vertex of the rear grid bar and the windward surface of the indoor heat exchanger is not less than 20 degrees and not more than 40 degrees; and the third included angle between the windward surface of the indoor heat exchanger and the horizontal plane is not less than 25 degrees and not more than 45 degrees.

[0015] Further, the first included angle between the connecting straight line between the vertex of the front grid bar and the vertex of the rear grid bar and the horizontal plane is not less than 5 degrees and not more than 15 degrees; the second included angle between the connecting straight line between the vertex of the front grid bar and the vertex of the rear grid bar and the windward surface of the indoor heat exchanger is not less than 20 degrees and not more than 40 degrees; and the third included angle between the windward surface of the indoor heat exchanger and the horizontal plane is not less than 25 degrees and not more than 45 degrees.

[0016] Further, the connecting line of the bottom end of all the grid bars is an arc line, the arc line is smoothly connected with the bottom surface of the indoor unit at the front end and the rear end in the front-rear direction of the indoor unit.

[0017] Further, the shell comprises a panel, the grid assembly is connected to the panel, the panel comprises a rear panel and a front panel, the rear panel extends from the grid assembly to the rear side of the indoor unit in the front-rear direction of the indoor unit, and the front panel is gradually raised in the direction from front to rear, the front panel is connected with the rear panel and forms the air inlet with the rear panel, the air outlet is arranged on the front panel, the front panel extends from the grid assembly to the front side of the indoor unit, and the front panel is gradually raised in the direction from rear to front.

[0018] Further, the bottom contour line of the rear panel and the bottom contour line of the front panel are smoothly connected with the bottom contour line of the grid assembly.

[0019] Further, the bottom contour line of the grid assembly extends from the middle plane in the front-rear direction of the indoor unit to the rear side, and the bottom contour line of the rear panel and the bottom contour line of the grid assembly constitute a total contour line, and the total contour line and the bottom contour line of the front panel are symmetrically arranged about the middle plane.

[0020] Further, the indoor unit further comprises a cross-flow fan, the cross-flow fan is arranged in the air duct, and the cross-flow fan is located between the indoor heat exchanger and the air outlet, wherein, in the direction close to the cross-flow fan, the distance between two adjacent grid bars gradually increases.

[0021] Further, the indoor heat exchanger has a windward surface, each grid bar has at least one inclined surface, wherein the fourth included angle between the inclined surface and the windward surface is not less than 85 degrees and not more than 95 degrees.

[0022] Further, the number of the inclined surfaces of each grid bar is two, and the two inclined surfaces form the fourth included angle with the windward surface.

[0023] Further, the projections of the plurality of grid bars in the height direction of the indoor unit do not overlap.

[0024] Further, the shell comprises a panel, the grid assembly further comprises a grid frame, the grid frame is mounted on the panel, and the grid bars are mounted on the grid frame.

[0025] Further, the panel has a plurality of hook holes, the grid frame comprises a plurality of hooking pieces, the hooking pieces and the hook holes are matched with each other, so that the grid assembly is mounted on the panel.

[0026] Further, the panel has a plurality of hook holes, the grid frame comprises a plurality of hook members, the hook members are matched with the hook holes, so that the grid assembly is installed on the panel; and the panel has a plurality of clamping holes, the grid frame comprises a plurality of clamping members, the clamping members are clamped in the clamping holes, so that the grid assembly is installed on the panel.

[0027] Further, the panel has a plurality of hook holes, the grid frame comprises a plurality of hook members, the hook members are matched with the hook holes, so that the grid assembly is installed on the panel; and the panel has a plurality of clamping holes, the grid frame comprises a plurality of clamping members, the clamping members are clamped in the clamping holes, so that the grid assembly is installed on the panel.

[0028] Further, the grid assembly further comprises a plurality of reinforcing ribs, the reinforcing ribs are arranged at intervals along the length direction of the grid frame, and each of the reinforcing ribs has a mounting groove matched with the grid bars, and the grid bars are mounted in the mounting groove.

[0029] Further, the grid frame, the reinforcing ribs and the grid bars are one-piece members.

[0030] Further, the indoor unit further comprises a filter screen, the filter screen is arranged between the grid assembly and the indoor heat exchanger, and is installed at the air inlet.

[0031] The second aspect of the embodiments of the present application provides a heating and ventilation device, which comprises the indoor unit and an outdoor unit, and the outdoor unit and the indoor unit form a circulating flow path.

[0032] The embodiments of the present application provide an indoor unit and a heating and ventilation device. The plurality of grid bars are arranged at intervals in an arc shape, and the whole formed by the plurality of grid bars is convex outward in a direction away from the indoor heat exchanger. In this way, on the one hand, the airflow can directly exchange heat with the indoor heat exchanger through the grid air inlet, and the path of the airflow flowing into the air duct from the position close to the cross-flow fan is shortened, so that the airflow can effectively enter the air duct to exchange heat with the indoor heat exchanger, thereby improving the heat exchange efficiency of the indoor unit. On the other hand, the whole formed by the plurality of grid bars is convex outward in a direction away from the indoor heat exchanger, that is, each grid bar extends obliquely from top to bottom, so that the airflow flows smoothly at the air inlet, thereby increasing the airflow amount and the area of the air duct that can accommodate the airflow amount. In the case where the power or power consumption of the cross-flow fan is the same, because the airflow amount is increased and the area of the air duct that can accommodate the airflow amount is increased, the speed of the airflow circulating in the air duct is faster, so that the working efficiency of the cross-flow fan converting electric energy into wind energy is higher, thereby improving the aerodynamic efficiency of the air duct. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 is a structural schematic diagram of an indoor unit in an embodiment of the present application;

[0034] Fig. 2 is a structural schematic diagram of the indoor unit in another perspective in an embodiment of the present application;

[0035] Fig. 3 is a structural schematic diagram of the indoor unit in a D-D cross section in Fig. 2;

[0036] Fig. 4 is a structural schematic diagram of a partial enlarged E of the indoor unit in Fig. 3;

[0037] Fig. 5 is an exploded structural schematic diagram of the indoor unit in an embodiment of the present application;

[0038] Fig. 6 is a structural schematic diagram of a partial structure of the indoor unit in an embodiment of the present application;

[0039] Fig. 7 is a structural schematic diagram of a partial structure of a grille assembly in an embodiment of the present application;

[0040] Fig. 8 is a structural schematic diagram of a partial structure of a panel in an embodiment of the present application.

[0041] Brief Description of the Drawings: 1 - indoor unit; 10 - shell; 10A - air inlet; 10B - air outlet; 10C - air duct; 10D - middle dividing surface; 11 - machine shell; 12 - panel; 12A - hook hole; 12B - clamping hole; 12C - filter screen slot; 121 - first connecting surface; 122 - second connecting surface; 20 - indoor heat exchanger; 21 - windward surface; 30 - grille assembly; 30A - grille air inlet; 31 - grille strip; 311 - inclined surface; 312 - front grille strip; 313 - rear grille strip; 32 - grille frame; 321 - hooking piece; 322 - clamping piece; 33 - reinforcing rib; 40 - cross-flow fan wheel; 50 - filter screen; 60 - water pan; 61 - main water pan; 62 - auxiliary water pan.

[0042] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will further describe the embodiments of the present application in connection with the accompanying drawings.

[0044] The following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0045] In the description of the present application, it is understood that the terms "first", "second" and the like are used only for the purpose of description, and cannot be understood 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 following three cases: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0046] 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 the present 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 associated items.

[0047] The embodiments of the present application provide a heating and ventilation device, which can include an outdoor unit and an indoor unit. The outdoor unit is usually installed outside the target space, and the indoor unit is usually installed inside the target space. The outdoor unit and the indoor unit can work together to form a circulating flow path to achieve the functions of cooling, heating, dehumidifying and purifying air of the target space, so as to achieve a comfortable target space. The outdoor unit of the heating and ventilation device can be one, and the indoor unit can be multiple, which is not limited in the embodiments of the present application.

[0048] Please refer to FIG. 1-3, in some embodiments of the present application, the indoor unit 1 can include a shell 10, an indoor heat exchanger 20 and a grille assembly 30.

[0049] Specifically, the shell 10 is provided with an air inlet 10A and an air outlet 10B at the bottom surface. The number of air inlets 10A and air outlets 10B can be one or more, which is not limited in the embodiments of the present application. For example, the number of air inlets 10A in the indoor unit 1 can be 2, and the number of air outlets 10B can be 1. The shell 10 has an air duct 10C inside, which communicates with the air inlet 10A and the air outlet 10B. The air duct 10C can be installed with multiple components, and the shell 10 can protect the components installed in the air duct 10C.

[0050] Please refer to FIG. 3, the indoor heat exchanger 20 is arranged in the air duct 10C, and the indoor heat exchanger 20 is arranged obliquely in the air duct 10C, so that the indoor heat exchanger 20 is arranged at least partially opposite to the air inlet 10A. The indoor heat exchanger 20 is a device arranged to transfer heat between two or more fluids. The main purpose of the indoor heat exchanger 20 is to transfer heat from one fluid to another fluid to achieve the effect of refrigeration, heating or temperature regulation. That is, when two fluids pass through the indoor heat exchanger 20 at different temperatures, heat will be transferred from the fluid with a higher temperature to the fluid with a lower temperature, so that heat is transferred between the fluids, thereby achieving heat balance. The indoor heat exchanger 20 is usually composed of a series of pipes, tube bundles or plates, arranged to facilitate heat transfer between heat sources or heat carriers, and there are many types of indoor heat exchangers 20. For example, the indoor heat exchanger 20 can be divided into partition type indoor heat exchanger, mixed type indoor heat exchanger and heat storage type indoor heat exchanger according to the principle and mode of heat exchange between cold and hot fluids. The embodiments of the present application do not make specific limitations.

[0051] Please refer to FIGS. 1-3, the grille assembly 30 is arranged at the air inlet 10A. In this way, the grille assembly 30 can cover and shield the air inlet 10A to prevent flocculent impurities and other foreign matters from entering the shell 10 through the air inlet 10A, causing the surface area of the indoor heat exchanger 20 to be covered with dust or causing the indoor heat exchanger 20 to be damaged, thereby ensuring the environmental hygiene and service life of the indoor heat exchanger 20. Since the grille assembly 30 shields the air inlet 10A, the grille assembly 30 can bring wind resistance at the air inlet 10A to avoid excessive noise at the air inlet 10A. That is, the noise of the airflow at the air inlet 10A can be reduced.

[0052] Please refer to FIGS. 2-3. Specifically, the grille assembly 30 can include a plurality of grille bars 31 arranged in an arc shape at intervals. The grille bar 31 can be in a long strip shape. In this way, the grille bar 31 can be easily processed. Of course, the grille bar 31 can also have other shapes, and the embodiments of the present application do not make specific limitations. Since the grille bars 31 are arranged at intervals, a gap can be formed between two adjacent grille bars 31. It can be understood that the gap formed between the two grille bars 31 subdivides the air inlet 10A formed in the shell 10 into a plurality of grille air inlets 30A. The airflow can flow into the air duct 10C from the plurality of grille air inlets 30A.

[0053] Please refer to FIG. 3. In some embodiments, the indoor unit 1 can also include a cross-flow fan 40 arranged in the air duct 10C. The cross-flow fan 40 can drive the airflow transmission in the air duct 10C. The number of cross-flow fans 40 can be one or more, and the embodiments of the present application do not make specific limitations.

[0054] Specifically, when the cross-flow fan 40 is located between the indoor heat exchanger 20 and the air outlet 10B, the air flow can flow into the indoor heat exchanger 20 through the plurality of grating air inlets 30A for heat exchange, and the air flow after heat exchange can flow through the cross-flow fan 40, and the cross-flow fan 40 can work on the air flow after heat exchange by rotating and conveying to the air outlet 10B to flow out, thereby realizing refrigeration or heating of the air conditioning device.

[0055] Please continue to refer to FIG. 3, further, the plurality of grating bars 31 are arranged in an arc shape at intervals, that is, the whole of the grating assembly 30 is arranged in an arc shape, so that the grating assembly 30 gradually thins in the front-back direction BB away from the indoor heat exchanger 20, so that the whole body of the indoor unit 1 can be relatively thin and slender. Compared to the whole formed by the plurality of grating bars 31 being concave towards the direction close to the indoor heat exchanger 20, the whole formed by the plurality of grating bars 31 is convex away from the indoor heat exchanger 20, that is, each grating bar 31 extends from top to bottom to make the air flow at the air inlet smooth, thereby increasing the air inlet amount of the air flow and the area in the air duct 10C that can accommodate the air inlet amount. In the case of the same power or power consumption of the cross-flow fan 40, the speed of the air flow circulating in the air duct 10C is faster due to the increase of the air inlet amount of the air flow and the area in the air duct 10C that can accommodate the air inlet amount, so that the work efficiency of the cross-flow fan 40 converting electrical energy into wind energy is higher, thereby improving the aerodynamic efficiency of the air duct 10C.

[0056] Further, by arranging the plurality of grating bars 31 in an arc shape at intervals, the path of the air flow flowing into the air duct 10C from the position close to the cross-flow fan 40 is shortened. It can be understood that when the air flow flows into the air duct 10C through the grating air inlet 30A, since the indoor heat exchanger 20 is arranged inclined in the air duct 10C and at least partially opposite to the air inlet 10A, the air flow can directly exchange heat with the indoor heat exchanger 20 through the grating air inlet 30A, and the path of the air flow flowing into the air duct 10C from the position close to the cross-flow fan 40 is shortened, so that the air flow can effectively enter the air duct 10C to exchange heat with the indoor heat exchanger 20, thereby improving the heat exchange efficiency of the indoor unit 1.

[0057] The embodiments of the present application set the plurality of grid bars 31 to be arranged in an arc shape at intervals, and the whole formed by the plurality of grid bars 31 is convex outward in the direction away from the indoor heat exchanger 20. In this way, on the one hand, the airflow can pass through the grid air inlet 30A to directly exchange heat with the indoor heat exchanger 20, and the path of the airflow flowing into the air duct 10C from the position close to the cross-flow fan 40 is shortened, so that the airflow can effectively enter the air duct 10C to exchange heat with the indoor heat exchanger 20, thereby improving the heat exchange efficiency of the indoor unit 1. On the other hand, the whole formed by the plurality of grid bars 31 is convex outward in the direction away from the indoor heat exchanger 20, that is, each grid bar 31 extends downward from top to bottom, so that the airflow flows smoothly at the air inlet, thereby increasing the airflow amount, and the area of the air duct 10C that can accommodate the airflow amount is increased. In the case that the power or power consumption of the cross-flow fan 40 is the same, because the airflow amount is increased and the area of the air duct 10C that can accommodate the airflow amount is increased, the speed of the airflow circulating in the air duct 10C is faster, so that the working efficiency of the cross-flow fan 40 converting electrical energy into wind energy is higher, thereby improving the aerodynamic efficiency of the air duct 10C.

[0058] Please continue to refer to FIG. 3. In some embodiments, the plurality of grid bars 31 can be arranged along the front-rear direction BB of the indoor unit 1, and the whole formed by the plurality of grid bars 31 gradually tilts toward the indoor unit 1 from front to back, that is, the plurality of grid bars 31 are arranged in an arc shape and gradually tilt toward the indoor unit 1, so that the grid bars 31 gradually thin from front to back. In this way, the overall body of the indoor unit 1 is relatively thin.

[0059] In some embodiments, the shell 10 can include a panel 12, and the grid assembly 30 is connected to the panel 12, that is, the grid assembly 30 can be installed on the panel 12 by screwing or clamping, and the panel 12 can include a rear panel and a front panel.

[0060] Specifically, along the front-rear direction BB of the indoor unit 1, the rear panel extends from the grid assembly 30 to the rear side of the indoor unit 1, and the rear panel gradually tilts from front to back, so that the rear panel gradually thins along the front-rear direction BB. The front panel is connected to the rear panel, that is, the front panel and the rear panel can be formed integrally to constitute the entire panel 12, and the front panel and the rear panel surround to form the air inlet 10A, and the air outlet 10B is arranged on the front panel. The front panel extends from the grid assembly 30 to the front side of the indoor unit 1, and the front panel gradually tilts from back to front, so that the front panel gradually thins along the back-front direction, thereby realizing that the panel 12 gradually thins along the front-rear direction BB. In this way, the overall body of the indoor unit 1 is relatively thin.

[0061] Further, in some embodiments, the bottom contour line of the rear panel and the bottom contour line of the front panel are both smoothly connected with the bottom contour line of the grid assembly 30, that is, the bottom contour line of the panel 12 is smoothly connected with the bottom contour line of the grid assembly 30, so as to avoid the grid bars 31 protruding from the bottom surface of the shell 10, and thus avoid being scratched by the grid bars 31.

[0062] Please continue to refer to FIG. 3, and further, in some embodiments, the bottom contour line of the grid assembly 30 extends from the middle surface 10D of the indoor unit 1 in the front-rear direction to the rear side, the bottom contour line of the rear panel and the bottom contour line of the grid assembly 30 form a total contour line, and the total contour line and the bottom contour line of the front panel are symmetrically arranged about the middle surface 10D. It can be understood that the middle surface 10D can divide the panel 12 into two sides, one side is the front panel and the other side is the rear panel, and in the front-rear direction BB of the indoor unit 1, the bottom contour line of the panel 12 is gradually curved from the middle surface 10D to the front-rear direction BB of the indoor unit 1, and the curvature is centrally symmetric about the middle surface 10D, so that the overall body of the indoor unit 1 is thick in the middle and gradually thins on both sides, so that the overall body of the indoor unit 1 is relatively thin.

[0063] In some embodiments, the connecting line of the bottom ends of all the grid bars 31 is an arc line, that is, the bottom ends of all the grid bars 31 are connected, and since the grid bars 31 are arranged in an arc shape, the connecting line of the bottom ends of all the grid bars 31 is an arc line, and the arc line is smoothly connected with the bottom surface of the indoor unit 1 at the rear end and the front end in the front-rear direction BB of the indoor unit 1. It can be understood that the grid bars 31 are smoothly connected with the bottom surface of the shell 10 to avoid the grid bars 31 protruding from the bottom surface of the shell 10, thereby avoiding being scratched by the grid bars 31.

[0064] In some embodiments, the grid assembly 30 can include a first grid bar group and a second grid bar group which are equally divided in the front-rear direction BB of the indoor unit 1, and the first grid bar group is closer to the air outlet 10B than the second grid bar group, wherein the curvature of the first grid bar group is smaller than the curvature of the second grid bar group. It can be understood that the first grid bar group closer to the air outlet 10B has a smaller curvature change range, and the second grid bar group farther from the air outlet 10B has a larger curvature change range, so that the grid assembly 30 is arranged in an arc shape, and the curvature of the grid assembly 30 is greater in the direction from front to back of the indoor unit 1, thereby making the grid assembly 30 gradually thin in the direction close to the rear side of the indoor unit 1, so that the overall body of the indoor unit 1 is relatively thin.

[0065] In some embodiments, along the front-rear direction BB of the indoor unit 1, the plurality of grid bars 31 can include a front side grid bar 312 closest to the front side of the indoor unit 1, and a rear side grid bar 313 closest to the rear side of the indoor unit 1, and the front side grid bar 312 is lower than the rear side grid bar 313, so that the plurality of grid bars 31 are arranged in an arc shape, and further, there is a height difference H between the front side grid bar 312 and the rear side grid bar 313, so that the overall of the plurality of grid bars 31 is convex outward in a direction away from the indoor heat exchanger 20, and the height difference H between the front side grid bar 312 and the rear side grid bar 313 is not less than 10 mm and not greater than 20 mm, for example, the height difference H between the front side grid bar 312 and the rear side grid bar 313 can be 10 mm, 15 mm, 20 mm, so that the air flow can smoothly enter the air inlet 10A, thereby increasing the air inlet amount of the air flow, and the area in the air duct 10C that can accommodate the air inlet amount is increased, and in the case that the power or power consumption of the cross-flow fan 40 is the same, because the air inlet amount of the air flow is increased and the area in the air duct 10C that can accommodate the air inlet amount is increased, the speed of the air flow circulating in the air duct 10C is faster, so that the working efficiency of the cross-flow fan 40 converting electrical energy into wind energy is higher, thereby improving the aerodynamic efficiency of the air duct 10C.

[0066] If the height difference H between the front side grid bar 312 and the rear side grid bar 313 is less than 10 mm, at this time, because the height difference H between the front side grid bar 312 and the rear side grid bar 313 is small, the air flow is easily blocked by the grid bar 31, thereby causing the air inlet amount of the air flow to decrease; if the height difference H between the front side grid bar 312 and the rear side grid bar 313 is greater than 20 mm, at this time, the height difference H between the front side grid bar 312 and the rear side grid bar 313 is large, so that the bending degree of the grid assembly 30 is large, and in the process of carrying the indoor unit 1, because the bending degree of the grid assembly 30 is large, the grid assembly 30 is easily damaged.

[0067] Referring to FIG. 3, in some embodiments, the indoor unit 1 can further include a water receiving tray 60, wherein the water receiving tray 60 can include a main water receiving tray 61 and a secondary water receiving tray 62, the main water receiving tray 61 is arranged at the bottom of the indoor heat exchanger 20, the secondary water receiving tray 62 is arranged below the indoor heat exchanger 20 and is in communication with the main water receiving tray 61, and the secondary water receiving tray 62 is located between the indoor heat exchanger 20 and the air inlet 10A. When the indoor unit 1 is working, the airflow flows into the air duct 10C from the plurality of grating air inlets 30A and exchanges heat with the indoor heat exchanger 20. Due to the temperature difference between the indoor heat exchanger 20 and the atmospheric air, condensate water appears on the indoor heat exchanger 20 and falls downward under the action of its own gravity. By arranging the secondary water receiving tray 62 below the indoor heat exchanger 20, not only can the secondary water receiving tray 62 receive the condensate water falling from the indoor heat exchanger 20, but also the condensate water received by the secondary water receiving tray 62 can be guided into the main water receiving tray 61, and the secondary water receiving tray 62 can also be arranged away from the air inlet 10A to avoid affecting the airflow flowing into the air duct 10C from the plurality of grating air inlets 30A.

[0068] Referring to FIGS. 3-4, further, in some embodiments, the connecting straight line between the vertex of the front grating bar 312 and the vertex of the rear grating bar 313 has a first included angle a with the horizontal plane, wherein the first included angle a is not less than 5 degrees and not greater than 15 degrees, for example, the first included angle a can be 5 degrees, 10 degrees, 15 degrees. In this way, the airflow can flow smoothly at the grating air inlet 30A, thereby increasing the airflow amount, and the area of the air duct 10C that can accommodate the airflow amount increases. In the case that the power or power consumption of the cross-flow fan 40 is the same, because the airflow amount increases and the area of the air duct 10C that can accommodate the airflow amount increases, the speed of the airflow circulating in the air duct 10C is faster, so that the working efficiency of the cross-flow fan 40 converting electrical energy into wind energy is higher, thereby improving the aerodynamic efficiency of the air duct 10C. If the first included angle a is less than 5 degrees, the plurality of grating bars 31 are likely to be arranged in parallel, which causes the airflow to be blocked by the grating bars 31. If the first included angle a is greater than 15 degrees, and the indoor heat exchanger 20 is arranged obliquely in the air duct 10C, so that the windward surface 21 can be closer to the air inlet 10A. When the secondary water receiving tray 62 receives a large amount of condensate water, the condensate water is likely to fall from the air inlet 10A to the outside of the indoor unit 1.

[0069] Please continue to refer to FIGS. 3-4. In other embodiments, the connecting straight line between the vertex of the front grating bar 312 and the vertex of the rear grating bar 313 has a second included angle b with the windward surface 21 of the indoor heat exchanger 20, wherein the second included angle b is not less than 20 degrees and not greater than 40 degrees, for example, the second included angle b can be 20 degrees, 30 degrees, 40 degrees. In this way, on the one hand, it can prevent the secondary water receiving tray 62 from receiving the condensate water falling to the outside of the indoor unit 1, and on the other hand, it can make the airflow flow smoothly at the grating air inlet 30A.

[0070] If the second included angle β is less than 20 degrees, and the indoor heat exchanger 20 is arranged obliquely in the air duct 10C, when the second included angle β is smaller, the windward surface 21 can be closer to the air inlet 10A, and when the sub-water receiving tray 62 is full of condensed water, it is easy to cause the condensed water to drip from the air inlet 10A to the outside of the indoor unit 1. If the second included angle β is greater than 40 degrees, the first included angle α needs to be in the range of not less than 5 degrees and not more than 15 degrees, and the grille assembly 30 includes a plurality of arc-shaped and spaced grille bars 31, so that the second included angle β is larger, which is easy to cause the overall curvature of the plurality of grille bars 31 to be smaller, so that the overall grille bar 31 is arranged in parallel, thereby causing the airflow to be blocked by the grille bar 31.

[0071] Please continue to refer to FIGS. 3-4, in some embodiments, the windward surface 21 of the indoor heat exchanger 20 has a third included angle θ with the horizontal plane, that is, the sum of the first included angle α and the second included angle β can be the third included angle θ, and the third included angle θ is not less than 25 degrees and not more than 45 degrees, for example, the third included angle θ can be 25 degrees, 35 degrees, 45 degrees, in this way, on the one hand, it can make the overall thickness of the indoor unit 1 along the height direction CC thinner, to improve the application scene of the indoor unit 1, on the other hand, at this time, the indoor heat exchanger 20 is arranged close to the air inlet 10A, under the drive of the cross-flow fan 40, it can make the airflow enter the air duct 10C from the air inlet 10A and then directly heat exchange with the indoor heat exchanger 20, in this way, the heat exchange efficiency is improved.

[0072] If the third included angle θ is less than 25 degrees, since the sub-water receiving tray 62 is arranged below the indoor heat exchanger 20, when the third included angle θ is smaller, the sub-water receiving tray 62 is closer to the air inlet 10A, which is easy to cause the condensed water received by the sub-water receiving tray 62 to drip from the air inlet 10A to the outside of the indoor unit 1. If the third included angle θ is greater than 45 degrees, the indoor heat exchanger 20 can be vertically arranged in the height direction CC, thereby causing the overall thickness of the indoor unit 1 along the height direction CC to be thicker.

[0073] Please continue to refer to FIGS. 3-4, in some embodiments, the indoor heat exchanger 20 has a windward surface 21, each of the plurality of grid bars 31 has at least one inclined surface 311, the fourth included angle δ between the windward surface 21 and the inclined surface 311 is not less than 85 degrees and not more than 95 degrees, for example, the first included angle can be 85 degrees, 90 degrees, 95 degrees, and so on. When the indoor unit 1 is working, the air flow can flow from the plurality of grid air inlets 30A into the air duct 10C, and by setting the fourth included angle δ between the windward surface 21 of the indoor heat exchanger 20 and the inclined surface 311 of the grid bar 31 in the range of not less than 85 degrees and not more than 95 degrees, that is, the inclined direction of the grid bar 31 matches the flow direction of the air flow, so that the air flow has a larger air intake amount, and the air flow can effectively enter the air duct 10C to exchange heat with the indoor heat exchanger 20, thereby improving the heat exchange efficiency of the indoor unit 1. In addition, the inclined surface 311 of the grid bar 31 and the indoor heat exchanger 20 can be arranged at an included angle, and the range of the fourth included angle δ is not less than 85 degrees and not more than 95 degrees, so that the air flow can flow from the plurality of grid air inlets 30A into the air duct 10C, that is, the air flow is less blocked by the grid bar 31, so that the air intake amount of the air flow is increased. In the case of the same power or power consumption of the cross-flow fan 40, because the air intake amount of the air flow is increased, the speed at which the air flow circulates in the air duct 10C is faster, so that the working efficiency of the cross-flow fan 40 converting electrical energy into wind energy is higher, thereby improving the aerodynamic efficiency of the air duct 10C.

[0074] Optionally, the fourth included angle δ can be set to 90 degrees, so that the flow direction of the air flow at the air inlet 10A is perpendicular to the windward surface 21 of the indoor heat exchanger 20, so that the air flow is less blocked by the grid bar 31, and the air intake amount of the air flow is increased. In the case of the same power or power consumption of the cross-flow fan 40, because the air intake amount of the air flow is increased, the speed at which the air flow circulates in the air duct 10C is faster, so that the working efficiency of the cross-flow fan 40 converting electrical energy into wind energy is higher, thereby improving the aerodynamic efficiency of the air duct 10C.

[0075] When the fourth included angle δ is greater than 95 degrees, the fourth included angle δ between the windward surface 21 of the indoor heat exchanger 20 and the inclined surface 311 of the grid bar 31 is larger, which on the one hand makes the indoor heat exchanger 20 occupy a larger area in the air duct 10C, which is not conducive to the miniaturization of the indoor unit 1, thereby limiting the application scenarios of the indoor unit 1, and on the other hand, when the air flow flows from the plurality of grid air inlets 30A, the air flow can be blocked by the grid bar 31, resulting in a decrease in the air intake amount. In the case of a certain power or power consumption of the cross-flow fan 40, because the air intake amount of the air flow is small, the speed at which the air flow circulates in the air duct 10C is slow, so that the working efficiency of the cross-flow fan 40 converting electrical energy into wind energy is slow, thereby reducing the aerodynamic efficiency of the air duct 10C.

[0076] When the fourth included angle δ is less than 85 degrees, the fourth included angle δ between the windward surface 21 of the indoor heat exchanger 20 and the inclined surface 311 of the grid strip 31 is smaller, that is, when the air flow flows into the air duct 10A from the grid air inlet 30A, the air flow can be blocked by the grid strip 31, so that the air inlet amount of the air flow flowing into the air duct 10A from the grid air inlet 30A is reduced. Under the condition that the power or power consumption of the cross-flow fan 40 is constant, because the air inlet amount of the air flow is small, the circulating speed of the air flow in the air duct 10C is slow, so that the working efficiency of the cross-flow fan 40 for converting electric energy into wind energy is slow, thereby reducing the aerodynamic efficiency of the air duct 10C.

[0077] Please continue to refer to FIGS. 3-4. In some embodiments, each grid strip 31 can have two inclined surfaces 311, and the two inclined surfaces 311 each have the fourth included angle δ with the windward surface 21 of the indoor heat exchanger 20, that is, the two inclined surfaces 311 can be arranged in parallel, and the included angle between the two inclined surfaces 311 on the grid strip 31 and the indoor heat exchanger 20 is the fourth included angle δ, so that the air flow flows into the air duct 10C from the air inlet 10A more smoothly, that is, the air flow is less blocked by the grid strip 31, thereby increasing the air inlet amount of the indoor unit 1.

[0078] Please continue to refer to FIGS. 3-4. In some embodiments, when the cross-flow fan 40 is located between the indoor heat exchanger 20 and the air outlet 10B, the distance between the adjacent two grid strips 31 gradually increases in the direction close to the cross-flow fan 40. It can be understood that because the cross-flow fan 40 can drive the air flow transmission in the air duct 10C, the flow rate of the air flow close to the cross-flow fan 40 is higher. However, because of the existence of the grid strip 31, when the air flow enters the air duct 10C from the air inlet 10A, it can be blocked by the grid strip 31, thereby causing the air resistance caused by the grid strip 31 to be large. Therefore, by arranging the distance between the adjacent two grid strips 31 to gradually increase in the direction close to the cross-flow fan 40, the problem of large air resistance caused by the grid strip 31 is reduced, thereby increasing the air inlet amount of the air flow. Under the condition that the power or power consumption of the cross-flow fan 40 is constant, because the air inlet amount of the air flow is increased, the circulating speed of the air flow in the air duct 10C is faster, so that the working efficiency of the cross-flow fan 40 for converting electric energy into wind energy is higher, thereby improving the aerodynamic efficiency of the air duct 10C.

[0079] Please continue to refer to FIGS. 3-4. In some embodiments, the projections of the plurality of grid strips 31 on the height direction CC of the indoor unit 1 do not overlap, that is, the grid air inlets 30A formed by the adjacent two grid strips 31 are increased, so that the air flow flows into the air duct 10C from the grid air inlet 30A more smoothly and uniformly, thereby increasing the air inlet amount of the indoor unit 1.

[0080] Referring to FIG. 5, in some embodiments, the shell 10 can include a cabinet 11 and a panel 12, the cabinet 11 can be provided in a cuboid, and the panel 12 is arranged on the bottom surface of the cabinet 11 and cooperates with the cabinet 11 to form an air duct 10C, and the panel 12 is provided with an air inlet 10A and an air outlet 10B. It can be understood that the indoor unit 1 can take in air from the air inlet 10A of the panel 12 and take out air from the air outlet 10B of the panel 12, wherein the air inlet 10A and the air outlet 10B can be respectively arranged on the two sides of the panel 12.

[0081] Referring to FIG. 5, further, the grille assembly 30 further includes a grille frame 32, the grille frame 32 is installed on the panel 12, and the grille bars 31 are installed on the grille frame 32, wherein the grille frame 32 can be provided in a rectangle, and the grille frame 32 can include four edge frames, the four edge frames can be arranged in a rectangular frame, and a plurality of grille bars 31 can be arranged in the rectangular frame, so that the grille bars 31 are installed on the grille frame 32, wherein the grille bars 31 and the grille frame 32 can be detachably connected, or can be an integral member, and the embodiments of the present application do not limit the connection form of the grille bars 31 and the grille frame 32.

[0082] For example, when the grille bars 31 and the grille frame 32 are detachably connected, if only one or more grille bars 31 are damaged, only the damaged grille bars 31 need to be replaced, so that the maintenance cost of the indoor unit 1 can be saved.

[0083] For example, when the grille bars 31 and the grille frame 32 are an integral member, in actual production, the process forming of the grille bars 31 and the grille frame 32 can be facilitated, and the whole formed by the grille bars 31 and the grille frame 32 can be directly installed on the panel 12, so that the convenience of installation of the indoor unit 1 is improved.

[0084] Referring to FIGS. 6-8, further, in some embodiments, the panel 12 has a plurality of hook holes 12A, and the grille frame 32 includes a plurality of hooking pieces 321, that is, a plurality of hook holes 12A can be arranged on the panel 12, and a plurality of hooking pieces 321 can be arranged on the edge frame of the grille frame 32, wherein each hooking piece 321 cooperates with the corresponding hook hole 12A, so that the grille assembly 30 is installed on the panel 12, and since the grille assembly 30 is installed on the panel 12 by hooking, the convenience of installation and disassembly of the grille assembly 30 can be improved.

[0085] Please continue to refer to FIGS. 6-8, in some other embodiments, the panel 12 can have both the plurality of hook holes 12A and the plurality of clamping holes 12B, and the grid frame 32 can include both the plurality of hooking members 321 and the plurality of clamping members 322, the plurality of hook holes 12A can cooperate with the plurality of hooking members 321, and the plurality of clamping holes 12B can cooperate with the plurality of clamping members 322, so that the stability of the installation of the grid assembly 30 and the panel 12 can be improved.

[0086] Please continue to refer to FIGS. 6-8, in some other embodiments, the panel 12 can have both the plurality of hook holes 12A and the plurality of clamping holes 12B, and the grid frame 32 can include both the plurality of hooking members 321 and the plurality of clamping members 322, the plurality of hook holes 12A can cooperate with the plurality of hooking members 321, and the plurality of clamping holes 12B can cooperate with the plurality of clamping members 322, so that the stability of the installation of the grid assembly 30 and the panel 12 can be improved.

[0087] It should be noted that the grid assembly 30 and the panel 12 can also be connected in other forms, and are not limited to the hooking and clamping of the grid assembly 30 and the panel 12. The embodiments of the present application do not make specific limitations in this regard.

[0088] Please refer to FIG. 6, in some embodiments, the grid assembly 30 further includes a plurality of reinforcing ribs 33, the plurality of reinforcing ribs 33 are arranged along the length direction AA of the grid frame 32, that is, the plurality of reinforcing ribs 33 can be arranged along the length direction AA of the grid frame 32 in the rectangular frame defined by the four edge frames of the grid frame 32, and each reinforcing rib 33 has a mounting groove (not shown in the figure) matched with the grid strip 31, and the grid strip 31 can be mounted in the mounting groove. It can be understood that each reinforcing rib 33 can have a plurality of mounting grooves, and each grid strip 31 can be mounted in one of the mounting grooves, so that the strength of the grid strip 31 in the front-back direction BB is increased, so that the grid strip 31 can be prevented from being broken.

[0089] Please refer to FIG. 4, further, the reinforcing rib 33 and the adjacent grid strip 31 can be connected through smooth transition, that is, the adjacent mounting grooves in each reinforcing rib 33 are connected through smooth transition, so that the stress concentration of the grid strip 31 and the reinforcing rib 33 can be avoided, so that the grid strip 31 can be prevented from being broken.

[0090] Please refer to FIG. 5, further, in some embodiments, the grid frame 32, the reinforcing rib 33 and the grid strip 31 can be an integral component, it can be understood that the grid frame 32, the reinforcing rib 33 and the grid strip 31 can be formed into an integral component by an injection molding process, thus, not only can facilitate the installation of the grid assembly 30 on the panel 12, improve the convenience of the indoor unit 1 installation, but also can improve the stability of the structure of the grid assembly 30.

[0091] It should be noted that the grid frame 32, the reinforcing rib 33 and the grid strip 31 can also be connected by detachable connection, such as clamping, screwing and the like, when at least one of the grid frame 32, the reinforcing rib 33 or the grid strip 31 is damaged and needs to be replaced, only the damaged parts of the grid assembly 30 need to be replaced, the entire grid assembly 30 does not need to be replaced, thus, the maintenance cost of the indoor unit 1 can be saved, and the disassembly and replacement.

[0092] Please refer to FIG. 3, in some embodiments, the indoor unit 1 further comprises a filter screen 50, the filter screen 50 can be a rectangular mesh structure, the filter screen 50 can be arranged to filter dust in the air to avoid dust in the air entering the air duct 10C to affect the indoor heat exchanger 20.

[0093] The filter screen 50 is arranged between the grid assembly 30 and the indoor heat exchanger 20, when the airflow flows from the air inlet 10A, it needs to flow through the filter screen 50, wherein the filter screen 50 can filter the flowing air, and then heat exchange with the indoor heat exchanger 20, thus, the dust impurities in the airflow can be avoided to enter the indoor heat exchanger 20 in the air duct 10C, thereby ensuring the cleanliness of the indoor heat exchanger 20, and since the filter screen 50 is arranged in a mesh shape, the filter screen 50 can further avoid the user's fingers from entering the air duct 10C, thereby improving the safety of the indoor unit 1 in use.

[0094] Please refer to FIG. 4 and FIG. 8, further, the filter screen 50 is installed at the air inlet 10A. The panel 12 can include a first connecting surface 121 and a second connecting surface 122, the first connecting surface 121 is provided with a hook hole 12A or a clamping hole 12B, so that the grid assembly 30 is installed on the first connecting surface 121, the second connecting surface 122 also has a filter screen slot 12C which is arranged in a staggered manner with the hook hole 12A or the clamping hole 12B provided on the first connecting surface 121, the filter screen 50 includes a filter screen mounting piece (not shown in the figure) which cooperates with the filter screen slot 12C, wherein the filter screen slot 12C and the filter screen mounting piece cooperate with each other to enable the filter screen 50 to be installed on the panel 12, and the filter screen 50 is detachably connected with the grid assembly 30 and the panel 12, thus, the filter screen 50 can be conveniently cleaned.

[0095] The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it is understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationships in the drawings are only used for exemplary illustration and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0096] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An indoor unit, wherein, Comprise: A shell, an air inlet and an air outlet are arranged at intervals on the bottom surface, and a wind channel is formed inside the shell to communicate with the air inlet and the air outlet; An indoor heat exchanger is arranged obliquely in the wind channel and at least partially opposite to the air inlet; and A grille assembly is arranged at the air inlet and comprises a plurality of arc-shaped and spaced grille bars, and the whole formed by the plurality of grille bars is convex outward in a direction away from the indoor heat exchanger.

2. The indoor unit of claim 1, wherein, The plurality of grille bars are arranged along the front-rear direction of the indoor unit, and the whole formed by the plurality of grille bars gradually tilts towards the indoor unit from the front to the rear.

3. The indoor unit of claim 1, wherein, The grille assembly comprises a first grille bar group and a second grille bar group which are equally divided along the front-rear direction of the indoor unit, the first grille bar group is closer to the air outlet than the second grille bar group, and the curvature of the first grille bar group is smaller than that of the second grille bar group.

4. The indoor unit of any one of claims 1 to 3, wherein, The plurality of grille bars are arranged along the front-rear direction of the indoor unit, the grille bars comprise a rear grille bar closest to the rear side of the indoor unit and a front grille bar closest to the front side of the indoor unit, the front grille bar is lower than the rear grille bar, and the height difference between the front grille bar and the rear grille bar is not less than 10 mm and not more than 20 mm.

5. The indoor unit of claim 4, wherein, The first included angle between the connecting straight line between the vertex of the front grille bar and the vertex of the rear grille bar and the horizontal plane is not less than 5 degrees and not more than 15 degrees.

6. The indoor unit of claim 4, wherein, The second included angle between the connecting straight line between the vertex of the front grille bar and the vertex of the rear grille bar and the windward surface of the indoor heat exchanger is not less than 20 degrees and not more than 40 degrees.

7. The indoor unit of claim 4, wherein, The first included angle between the connecting straight line between the vertex of the front grille bar and the vertex of the rear grille bar and the horizontal plane is not less than 5 degrees and not more than 15 degrees; and The second included angle between the connecting straight line between the vertex of the front grille bar and the vertex of the rear grille bar and the windward surface of the indoor heat exchanger is not less than 20 degrees and not more than 40 degrees.

8. The indoor unit of claim 4, wherein, The third included angle between the windward surface of the indoor heat exchanger and the horizontal plane is not less than 25 degrees and not more than 45 degrees.

9. The indoor unit of claim 4, wherein, The first included angle between the connecting straight line between the vertex of the front grille bar and the vertex of the rear grille bar and the horizontal plane is not less than 5 degrees and not more than 15 degrees; and The third included angle between the windward surface of the indoor heat exchanger and the horizontal plane is not less than 25 degrees and not more than 45 degrees.

10. The indoor unit of claim 4, wherein, The second included angle between the connecting straight line between the vertex of the front grille bar and the vertex of the rear grille bar and the windward surface of the indoor heat exchanger is not less than 20 degrees and not more than 40 degrees; and The third included angle between the windward surface of the indoor heat exchanger and the horizontal plane is not less than 25 degrees and not more than 45 degrees.

11. The indoor unit as claimed in claim 4, wherein, The first included angle between the connecting straight line between the vertex of the front grille bar and the vertex of the rear grille bar and the horizontal plane is not less than 5 degrees and not more than 15 degrees; The second included angle between the connecting straight line between the vertex of the front grille bar and the vertex of the rear grille bar and the windward surface of the indoor heat exchanger is not less than 20 degrees and not more than 40 degrees; and The third included angle between the windward surface of the indoor heat exchanger and the horizontal plane is not less than 25 degrees and not more than 45 degrees. A third angle between the windward surface of the indoor heat exchanger and the horizontal plane is not less than 25 degrees and not more than 45 degrees.

12. The indoor unit of any one of claims 1 to 11, wherein, A connecting line of bottom ends of all the grid bars is an arc-shaped line, and the arc-shaped line is smoothly connected with the bottom surface of the indoor unit at a rear end and a front end in the front-rear direction of the indoor unit.

13. The indoor unit of any one of claims 1 to 12, wherein, The shell includes a panel, and the grid assembly is connected to the panel. The rear panel extends from the grid assembly to the rear side of the indoor unit in the front-rear direction of the indoor unit and gradually rises from the front to the rear. The front panel is connected with the rear panel and surrounds the rear panel to form the air inlet, and the air outlet is arranged on the front panel.

14. The indoor unit of claim 13, wherein, The bottom contour line of the rear panel and the bottom contour line of the front panel are smoothly connected with the bottom contour line of the grid assembly.

15. The indoor unit of claim 14, wherein, The bottom contour line of the grid assembly extends from the middle plane in the front-rear direction of the indoor unit to the rear side, and the bottom contour line of the rear panel and the bottom contour line of the grid assembly are axially symmetrically arranged with the bottom contour line of the front panel about the middle plane.

16. The indoor unit of any one of claims 1 to 15, wherein, The indoor unit further comprises: The cross-flow fan wheel is arranged in the air duct and located between the indoor heat exchanger and the air outlet. In the direction close to the cross-flow fan wheel, the distance between adjacent two grid bars gradually increases.

17. The indoor unit of any one of claims 1 to 16, wherein, The indoor heat exchanger has a windward surface, and each grid bar has at least one inclined surface. The fourth angle between the inclined surface and the windward surface is not less than 85 degrees and not more than 95 degrees.

18. The indoor unit of claim 17, wherein, The number of the inclined surfaces of each grid bar is two, and the two inclined surfaces form the fourth angle with the windward surface.

19. The indoor unit of any one of claims 1 to 18, wherein, The projections of the plurality of grid bars in the height direction of the indoor unit do not overlap.

20. The indoor unit of any one of claims 1 to 19, wherein, The shell includes a panel, and the grid assembly further comprises a grid frame, the grid frame is mounted on the panel, and the grid bars are mounted on the grid frame.

21. The indoor unit of claim 20, wherein, The panel has a plurality of hook holes, and the grid frame comprises a plurality of hooking members.

22. The indoor unit of claim 20, wherein, The panel has a plurality of clamping holes, and the grid frame comprises a plurality of clamping members.

23. The indoor unit of claim 20, wherein, The panel has a plurality of hook holes, and the grid frame comprises a plurality of hooking members. The panel has a plurality of clamping holes, and the grid frame comprises a plurality of clamping members.

24. The indoor unit of claim 20, wherein, The grid assembly further comprises: A plurality of reinforcing ribs are arranged at intervals in the length direction of the grid frame, and each reinforcing rib has a mounting groove matched with the grid bar, and the grid bar is mounted in the mounting groove.

25. The indoor unit of claim 24, wherein, The grid frame, the reinforcing rib and the grid strip are integrated components.

26. The indoor unit of any one of claims 1 to 25, wherein, The indoor unit further comprises: A filter screen is arranged between the grid assembly and the indoor heat exchanger and is installed at the air inlet.

27. A heating and ventilating apparatus wherein, Comprise: The indoor unit according to any one of claims 1 to 26; And, An outdoor unit, which forms a circulating flow path with the indoor unit.

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