Indoor unit and heating and ventilation system

Abstract

Provided are an indoor unit and a heating and ventilation system. The indoor unit comprises a housing, a main board support (5), an electric control board (6), and a cover (7). A mounting cavity (2) is formed in the housing; the main board support (5) is located in the mounting cavity (2) and is connected to the housing; the electric control board (6) is located in the mounting cavity (2) and is connected to the main board support (5); the cover (7) is located in the mounting cavity (2) and is connected to the housing, and the cover (7) and the housing define an accommodating cavity (8) for accommodating the electric control board (6).

Description

Indoor unit and HVAC system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 25, 2024, with application number 202420586698.9 and invention name “Indoor unit and HVAC system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of air conditioning, and in particular to an indoor unit and a heating and ventilation system using the indoor unit. Background Art

[0003] Embedded indoor units generally refer to indoor units installed on the ceiling, and in taller buildings and other structures, ceiling units are more commonly used.

[0004] In related technologies, an embedded indoor unit generally includes a shell, an electrical control box and a heat exchanger. The shell includes a chassis, multiple side panels and a panel. The multiple side panels are arranged around the sides of the chassis, the panel and the chassis are arranged opposite to each other, and the panel cover is arranged at the bottom of the multiple side panels. The panel, chassis and multiple side panels enclose an installation cavity.

[0005] However, in the above-mentioned embedded indoor unit, the steps for assembling the electric control box and mounting it on the shell are relatively complicated, which will reduce the overall assembly efficiency of the embedded indoor unit; in addition, the disassembly and assembly of the electric control box and the wiring of the internal electric control board are relatively inconvenient. Summary of the Invention

[0006] The embodiments of the present application provide an indoor unit and a HVAC system, which are configured to solve the problem of low assembly efficiency of indoor units in the related art.

[0007] On the one hand, the present application provides an indoor unit, including a shell, a mainboard bracket, an electric control board and a cover body, the shell is formed with an installation cavity; the mainboard bracket is located in the installation cavity and is connected to the shell; the electric control board is located in the installation cavity and is connected to the mainboard bracket; the cover body is located in the installation cavity and is connected to the shell, and the cover body and the shell are enclosed to form a accommodating cavity for accommodating the electric control board.

[0008] As an optional embodiment, the housing includes a panel and a casing. The bottom of the casing is open, and the panel cover is positioned at the open position to enclose the panel and form an installation cavity. The panel has a return air inlet and an air outlet connected to the installation cavity, and the return air inlet and the air outlet are spaced apart. The cover is exposed from either the return air inlet or the air outlet. Thus, when the cover is exposed from the return air inlet, the airflow entering through the return air inlet during fan operation can carry away heat generated by the electric control board. When the cover is exposed from the air outlet, the airflow flowing out of the air outlet during fan operation can also carry away heat generated by the electric control board. This can dissipate heat from the electric control board, and further dissipate heat from the electric control module, thereby improving the performance of the indoor unit provided by the present application. Furthermore, when the cover is exposed from the return air inlet or the air outlet, the cover can be seen after the panel is opened, making it easier to disassemble the cover and, in turn, to repair the main control board.

[0009] As an optional embodiment, the housing includes a chassis and a plurality of side panels surrounding the chassis. The chassis and the panel are disposed opposite each other, with the bottom surface of the chassis forming the top wall of the mounting cavity, and the inner surfaces of the side panels forming the side walls of the mounting cavity. The motherboard bracket is connected to the chassis, and the cover is connected to the chassis or the side panels. This improves the convenience of connecting the motherboard bracket to the housing.

[0010] As an optional embodiment, the cover body includes a cover plate and multiple end caps, which are arranged around the cover plate. The cover plate is connected to the side panels, and one end of the end cap is connected to the cover plate, while the other end of the end cap extends toward the chassis. This not only simplifies the cover body's processing and reduces processing costs, but also improves the sealing between the cover body and the end caps.

[0011] As an optional embodiment, the cover includes a covering portion and a connecting portion, wherein the end cap is connected to the covering portion; a first end of the connecting portion is connected to the covering portion, a second end of the connecting portion extends toward the side panel, and the connecting portion and the side panel are connected by a fastener; wherein the first end of the connecting portion is located above the second end of the connecting portion. When the first end of the connecting portion is located above the second end of the connecting portion, it means that the extending direction of the connecting portion has an angle with both the horizontal direction and the vertical direction, that is, the connecting portion extends in an inclined direction. In this way, the axial direction of the fastener is perpendicular to the extending direction of the connecting portion, that is, the axial direction of the fastener also has an angle with both the horizontal direction and the vertical direction. In this way, the axial direction of the fastener can be prevented from being aligned with the horizontal direction. Furthermore, when an operator connects the cover body to the side panel, his hand can more easily operate a third-party tool, and the hand can more easily apply force to the third-party tool, thereby improving the efficiency of disassembly and assembly between the cover body and the casing.

[0012] As an optional embodiment, the return air vent and the cover are arranged vertically opposite each other. This allows the airflow entering through the return air vent to directly collide with the electronic control module, thereby quickly removing more heat generated by the electronic control board, thereby improving the heat dissipation efficiency of the electronic control board. In addition, the cover can be easily removed, making it easier to repair the electronic control board.

[0013] As an optional embodiment, the cover portion includes a first cover body and a second cover body; the first cover body is located between the end cap and the second cover body, the second cover body is located between the first cover body and the connecting portion, and the second cover body is connected to the first end of the connecting portion; wherein one end of the first cover body is connected to the second cover body, and the other end of the first cover body extends upward and connects to the end cap. In this way, the connection between the cover portion and the end cap is not a right angle, but forms an oblique angle. Such an arrangement can, to a certain extent, avoid the airflow entering from the return air port, to a certain extent, and avoid the influence of the cover body on the air intake, thereby improving the performance of the indoor unit provided by this application.

[0014] As an optional embodiment, the angle between the extension direction of the first covering body and the horizontal direction is greater than or equal to the angle between the flow direction of the airflow flowing in through the return air inlet and the horizontal direction. In this way, even if the airflow flowing in from the return air inlet collides with the first covering body, if the angle between the extension direction of the first covering body and the horizontal direction is equal to the angle between the flow direction of the airflow flowing in through the return air inlet and the horizontal direction, the first covering body can still play a certain guiding role in the flow direction of the airflow; or, if the angle between the extension direction of the first covering body and the horizontal direction is greater than the angle between the flow direction of the airflow flowing in through the return air inlet and the horizontal direction, the airflow can continue to flow downstream along its original direction after colliding with the first covering body.

[0015] As an optional embodiment, the cover further includes a flange connected to the second end of the connecting portion; the flange extends downward along the side panel surface and contacts the side panel. Thus, when the flange contacts the side panel, the sealing performance between the flange and the side panel is improved, thereby improving the sealing performance between the cover body and the housing.

[0016] As an optional embodiment, the motherboard bracket at least partially extends out of the cover body in the longitudinal direction of the cover body, and the end of the end cap away from the cover plate abuts against the surface of the motherboard bracket facing away from the chassis. In this way, circuit safety requirements can be met.

[0017] As an optional embodiment, there is at least one return air vent, and the area occupied by the return air vent on the panel partially overlaps with the projection area of ​​the cover on the panel. This can further improve the heat dissipation efficiency of the electronic control board.

[0018] As an optional embodiment, a fan and a heat exchanger are further included, both located within the mounting cavity. The cover and the fan are located on opposite sides of the heat exchanger, with a water tray located below the heat exchanger. The water tray has a notch that allows clearance for the cover. This notch ensures that even after the electronic control module is installed on the chassis, it will not interfere with other structures or components.

[0019] As an optional embodiment, a wire hole is provided in the cover body, and the wire hole is configured to pass through the wire harness connected to the electronic control board. By providing a wire hole in the end cover, the wire harness connected to the electronic control board can pass through the accommodating cavity, thereby achieving a normal electrical connection between the electronic control board and other electrical components.

[0020] As an optional embodiment, a wire clamp is provided on the mainboard bracket, and the wire clamp is configured to clamp the wire harness connected to the electric control board. In this way, integrating the wire clamp on the mainboard bracket can improve the compactness of the indoor unit provided by this embodiment.

[0021] On the other hand, the present application provides a HVAC system including the above-mentioned indoor unit.

[0022] In the indoor unit and HVAC system provided by the embodiment of the present application, when assembling the electronic control module and the shell of the indoor unit, the main board bracket is first connected to the shell, and then the electronic control board is connected to the main board bracket. Finally, the cover body is connected to the shell. Compared with the assembly method of the electronic control module in the related art, since there is no box body design in this embodiment, when assembling the electronic control module provided by this embodiment, there is no connection between the box body and the shell and the connection between the cover body and the box body, thereby reducing the number of assembly steps. Therefore, it is possible to shorten the installation time of the electronic control module on the shell and improve the overall assembly efficiency of the indoor unit provided by this embodiment; in addition, when the box body is not set, the required amount of raw materials for the entire electronic control module will also be less, which can save costs; moreover, when inspecting the electronic control module, the cover body can be removed from the shell to inspect the electronic control board, thereby improving the convenience of inspecting the electronic control module. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of a three-dimensional structure of a partial structure of an indoor unit provided in an embodiment of the present application;

[0024] FIG2 is a schematic structural diagram of a partial structure of FIG1 ;

[0025] FIG3 is a schematic diagram of the planar structure of FIG1 ;

[0026] FIG4 is a cross-sectional view taken along the AA direction in FIG3 ;

[0027] FIG5 is an enlarged schematic diagram of the local structure at point B in FIG4 ;

[0028] FIG6 is an enlarged schematic diagram of the local structure at point C in FIG1 ;

[0029] FIG7 is a schematic diagram of the coordination relationship between the water receiving tray and the electronic control module in the indoor unit provided in an embodiment of the present application;

[0030] FIG8 is a schematic structural diagram of a water receiving tray in an indoor unit provided in an embodiment of the present application.

[0031] Figure markings: 1. Casing; 2. Installation cavity; 4. Water collecting tray; 5. Mainboard bracket; 6. Electronic control board; 7. Cover body; 8. Accommodating cavity; 9. Wire clamp; 10. Wire clamp; 11. Chassis; 12. Side panel; 41. Notch; 51. First snap fastener; 52. Second snap fastener; 61. Circuit board; 71. Cover plate; 72. End cover; 73. Wire hole; 511. First stop surface; 512. Guide slope; 521. Second stop surface; 711. Covering part; 712. Connecting part; 713. Flanged edge; 7111. First covering body; 7112. Second covering body. DETAILED DESCRIPTION

[0032] In the related art, an embedded indoor unit generally includes a housing, an electric control box, and a heat exchanger. The housing includes a chassis, multiple side panels, and a panel. The multiple side panels are arranged around the sides of the chassis. The panel is arranged opposite to the chassis. The panel cover is arranged at the bottom of the multiple side panels. The panel, chassis, and multiple side panels enclose an installation cavity. The electric control box includes a box body, a box cover, an insulating support plate, and an electric control board. The box body is connected to the side panels. The box cover is arranged on the box body. The box cover and the box body enclose an accommodating cavity. The accommodating cavity accommodates the insulating support plate and the electric control board. The insulating support plate is mounted on the box body and connected to the bottom wall of the installation cavity. The electric control board is mounted on the insulating support plate. However, in the above-mentioned embedded indoor unit, the electric control box requires a large number of parts. When assembling the electric control box and assembling the electric control box to the housing, the steps are relatively cumbersome, which reduces the overall assembly efficiency of the embedded indoor unit. In addition, the electric control box is mounted on the side panels, which makes it inconvenient to disassemble and assemble the electric control box and to connect the internal electric control board.

[0033] Therefore, the embodiments of the present application provide an indoor unit and a HVAC system, which can improve the assembly efficiency of the indoor unit.

[0034] It should be noted that the indoor unit provided in the embodiments of the present application includes but is not limited to a ceiling unit.

[0035] Please refer to Figures 1 and 2. Figure 1 is a three-dimensional structural diagram of a partial structure of an indoor unit provided in an embodiment of the present application, and Figure 2 is a structural diagram of the partial structure of Figure 1. As shown in Figures 1 and 2, this embodiment provides an indoor unit, including a shell, the shell including a panel (not shown in the figure) and a casing 1, the casing 1 including a chassis 11 and a plurality of side panels 12, the plurality of side panels 12 are arranged around the circumference of the chassis 11, the bottom end of the casing 1 is open, the panel cover is arranged at the open position, the panel and the casing 1 are enclosed to form an installation cavity 2, wherein the chassis 11 and the panel are arranged opposite to each other, and the bottom surface of the chassis 11 forms the cavity top wall of the installation cavity 2, and the inner plate surface of the side panel 12 forms the cavity side wall of the installation cavity 2.

[0036] Please continue to refer to Figures 3 and 4. Figure 3 is a schematic plan view of the structure of Figure 1, and Figure 4 is a cross-sectional view taken along line AA of Figure 3. It will be understood that airflow occurs during operation of the indoor unit, and therefore, an air duct may be formed within the housing 1. When the air duct is formed within the housing 1, the side walls of the air duct may be the walls of the mounting cavity 2. Alternatively, a duct housing configured to form the air duct may be provided within the mounting cavity 2. In this case, the side walls of the air duct serve as the inner wall surfaces of the duct housing. The specific method for forming the air duct is not specifically limited herein.

[0037] In order to enable the indoor unit to operate normally, generally, a heat exchanger (not shown in the figure) and a fan (not shown in the figure) are set inside the air duct, and a return air inlet and an air outlet can be set on the panel. The return air inlet and the air outlet are both connected to the air duct, and the return air inlet and the air outlet are set at intervals. When the side wall of the air duct is formed by the cavity wall of the installation cavity 2, the return air inlet and the air outlet are also connected to the installation cavity 2. Specifically, during the operation of the indoor unit, the air in the indoor environment enters the air duct from the return air inlet, and the fan sucks the airflow. After the airflow is heated or cooled by the heat exchanger, it flows out from the air outlet through the fan to heat up or cool down the indoor environment.

[0038] It should be noted that, in order to prevent the condensed water generated by the heat exchanger from flowing to other components or modules, a water receiving pan 4 is generally provided below the heat exchanger, and the condensed water generated by the heat exchanger will flow to the water receiving pan 4 .

[0039] When the indoor unit is running, it is necessary to control the electrical components in the indoor unit through the electric control module. Taking the ceiling unit as an example, it can be seen from the above that in the relevant technology, the electric control module is an electric control box installed on the side panel, and the box body of the electric control box is connected to the side panel. When the electric control module needs to be installed on the side panel, it is necessary to assemble the electric control module first, and then install it as a whole on the side panel. Specifically, it is necessary to first connect the insulating support plate to the box body, and then install the electric control board on the insulating support plate. After that, the electric control box cover is connected to the box body, and finally, the electric control module is connected as a whole to the side panel. This assembly method is relatively cumbersome and will reduce the overall assembly efficiency of the indoor unit.

[0040] Please continue to refer to Figure 5, which is an enlarged schematic diagram of the partial structure at point B in Figure 4. To overcome this defect, in the indoor unit provided in this embodiment, the electric control module includes a mainboard bracket 5, an electric control board 6, and a cover 7. The mainboard bracket 5 is located in the installation cavity 2 and is connected to the housing. Specifically, the mainboard bracket 5 can be connected to the chassis 11 or the side panel 12; the electric control board 6 is located in the installation cavity 2 and is connected to the mainboard bracket 5; the cover 7 is located in the installation cavity 2 and is connected to the housing. Specifically, the cover 7 can be connected to the chassis 11 and / or the side panel 12, and the cover 7 and the housing 1 enclose a receiving cavity 8, which is configured to accommodate the electric control board 6.

[0041] In this way, when the electric control module provided in this embodiment is installed on the casing 1, it is necessary to first connect the mainboard bracket 5 to the casing 1, then connect the electric control board 6 to the mainboard bracket 5, and finally, connect the cover body 7 to the casing 1. Compared with the assembly method of the electric control module in the related art, since there is no box body design in this embodiment, when assembling the electric control module provided in this embodiment, there is no connection between the box body and the casing, and the connection between the cover body and the box body, thereby reducing the number of assembly steps. Therefore, it is possible to shorten the installation time of the electric control module on the casing 1, and improve the overall assembly efficiency of the indoor unit provided in this embodiment; in addition, when the box body is not set, the amount of raw materials required for the entire electric control module will be reduced, which will reduce cost savings; and when the electric control module is inspected, the cover body 7 can be removed from the casing 1 to inspect the electric control board 6, thereby improving the convenience of inspecting the electric control module.

[0042] It should be noted that when the mainboard bracket 5 is connected to the side panel 12, the cover body 7 can be connected to either the side panel 12 or the chassis 11; when the mainboard bracket 5 is connected to the chassis 11, the cover body 7 can be connected to either the side panel 12 or the chassis 11.

[0043] It is understandable that when the indoor unit is operating normally, the electric control board 6 will generate a lot of heat. Therefore, in order to maintain the normal operation of the indoor unit, it is necessary to dissipate heat from the electric control board 6. Therefore, in this embodiment, the cover 7 is exposed from either the return air port or the air outlet. In this way, when the cover 7 is exposed from the return air port, the airflow entering through the return air port during the operation of the fan can carry away the heat generated by the electric control board 6; when the cover 7 is exposed from the air outlet, the airflow flowing out of the air outlet during the operation of the fan can also carry away the heat generated by the electric control board 6. This can achieve heat dissipation of the electric control board 6, and then achieve heat dissipation of the electric control module, thereby improving the performance of the indoor unit provided by this embodiment.

[0044] For ceiling machines, the surface direction of the side panel 12 is along the vertical direction. If the mainboard bracket 5 and the side panel 12 are connected by fasteners such as screws, the axial direction of the fastener is along the horizontal direction. When the operator uses a third-party tool to operate the fastener, the operating posture of the human hand is relatively awkward. Therefore, in order to improve the convenience of connection between the mainboard bracket 5 and the casing 1, the mainboard bracket 5 can be connected to the chassis 11.

[0045] Generally, the motherboard bracket 5 is a plastic part, and the chassis 11 is a sheet metal part. Threaded fasteners such as screws can be used to connect the motherboard bracket 5 and the chassis 11. This allows the axial direction of the threaded fastener to be vertical, making it easier for the operator to apply force to a third-party tool when disassembling or assembling the motherboard bracket 5, thereby facilitating the operation of the threaded fastener.

[0046] At present, in order to improve the connection efficiency and connection reliability between parts, the connection between parts generally tends to be screwless. Therefore, in some optional embodiments, a snap-fit ​​connection method can be adopted between the electronic control board 6 and the main board bracket 5. The electronic control board 6 includes a circuit board 61 and electrical components arranged on the circuit board 61. The circuit board 61 and the main board bracket adopt a snap-fit ​​connection method.

[0047] As shown in Figure 5, a first clip 51 and a second clip 52 can be set on both sides of the width direction of the cover body 7 on the mainboard bracket 5, wherein the first clip 51 has a first stop surface 511, the first stop surface 511 is located at the lower end of the circuit board 61, and the first stop surface 511 is snap-connected with the circuit board 61, and the second clip 52 has a second stop surface 521, the second stop surface 521 is located at the lower end of the circuit board 61, and the second stop surface 521 is snap-connected with the circuit board 61.

[0048] It should be noted that the width direction of the cover 7 is consistent with the yy-axis direction in FIG. 1 to FIG. 3 .

[0049] In order to facilitate the snap connection between the circuit board 61 and the first clip 51, a guide slope 512 can be set on one side of the first clip 51, and the side of the guide slope 512 away from the center of the accommodating cavity 8 is located below the side of the guide slope 512 close to the center of the accommodating cavity 8.

[0050] It can be understood that in order to improve the connection reliability between the circuit board 61 and the mainboard bracket 5, multiple first clips 51 and multiple second clips 52 can be set, and the distribution direction of the multiple first clips 51 and the multiple second clips 52 are consistent with the length direction of the cover body 7, wherein the length direction of the cover body 7 is consistent with the xx-axis direction in Figures 1 to 3.

[0051] Due to certain electrical safety regulations, a wire clamp 9 is required on the motherboard bracket 5. This clamp 9 is for the power cord to pass through. Since the power cord is relatively thick, it needs to be separated from the other wiring harnesses connected to the electrical control board 6. Therefore, the wire clamp 9 needs to be exposed outside the accommodating cavity 8. During assembly, the cover 7 is first attached to the housing 1, and then the wire clamp 9 is installed on the motherboard bracket 5. This ensures that at least a portion of the motherboard bracket 5 extends beyond the cover 7 along its length, thus meeting electrical safety regulations.

[0052] The length direction of the cover 7 is consistent with the xx-axis direction in Figures 1 to 3.

[0053] In some specific embodiments, both sides of the mainboard bracket 5 along the length direction of the return air outlet are provided with a wire clamp 9. Therefore, in the length direction of the cover 7, both ends of the mainboard bracket 5 along the length direction of the return air outlet extend out of the cover 7.

[0054] When the mainboard bracket 5 is larger than the mainboard bracket 5 in the length direction of the cover 7, the bottom surface of the mainboard bracket 5 forms the top wall of the accommodating cavity 8. The cover 7 includes a cover plate 71 and multiple end caps 72, which are arranged around the circumference of the cover plate 71. The cover plate 71 is connected to the side plate 12, and one end of the end cap 72 is connected to the cover plate 71, and the other end of the end cap 72 extends toward the chassis 11. The inner wall of the cover plate 71 forms the bottom wall of the accommodating cavity 8, and the inner surface of the end cap 72 and the inner surface of the side plate 12 together form the side walls of the accommodating cavity 8.

[0055] If the end cap 72 is connected to the chassis 11, a connecting plate extending along the inner wall of the chassis 11 would need to be installed at the top of the end cap 72. This connection would undoubtedly complicate the manufacturing process of the cover 7 and increase the manufacturing cost. Therefore, in this embodiment, the connection between the cover 7 and the housing 1 only requires connecting the cover plate 71 to the side panel 12. This way, the end of the end cap 72 facing away from the cover plate 71 abuts the surface of the mainboard bracket 5 facing away from the chassis 11. This not only simplifies the manufacturing process of the cover 7 and reduces manufacturing costs, but also improves the seal between the cover 7 and the end cap 72.

[0056] To connect the cover 7 to the side panels 12, in this embodiment, the cover 71 includes a covering portion 711 and a connecting portion 712. The end cap 72 is connected to the covering portion 711. The first end of the connecting portion 712 is connected to the covering portion 711, and the second end of the connecting portion 712 extends toward the side panels 12. Since the cover 7 is also a sheet metal component, the connecting portion 712 and the side panels 12 can be connected using fasteners. The first end of the connecting portion 712 is located above the second end of the connecting portion 712.

[0057] When the first end of the connecting portion 712 is located above the second end of the connecting portion 712, it means that the extension direction of the connecting portion 712 forms an angle with both the horizontal direction and the vertical direction, that is, the connecting portion 712 extends in an inclined direction. In this way, the axial direction of the fastener is perpendicular to the extension direction of the connecting portion 712, that is, the axial direction of the fastener also forms an angle with both the horizontal direction and the vertical direction. In this way, the axial direction of the fastener can be prevented from being aligned with the horizontal direction. Furthermore, when the operator connects the cover body 7 to the side panel 12, their hands can more easily operate the third-party tool, and the hands can more easily apply force to the third-party tool, which can improve the efficiency of disassembly and assembly between the cover body and the housing 1.

[0058] It should be noted that in this embodiment, the above-mentioned fasteners can be threaded fasteners such as screws, and at this time, threaded holes with an axial direction consistent with the axial direction of the fasteners need to be provided on the connecting portion 712 and the side panel 12 connected thereto, that is, the axial direction of the threaded hole is perpendicular to the extension direction of the connecting portion 712.

[0059] In some optional embodiments, to facilitate heat dissipation of the electric control board 6 and to facilitate removal of the cover 7, the return air vent and the cover 7 can be arranged vertically opposite each other, that is, the cover 7 is exposed by the return air vent. In this way, when air enters through the return air vent, it can directly collide with the electric control module, thereby quickly carrying away more heat generated by the electric control board 6, thereby improving the heat dissipation efficiency of the electric control board 6. In addition, when the cover 7 and the return air vent are arranged vertically opposite each other, after removing the panel, the cover 7 can be removed, and then the electric control board 6 can be inspected, thereby improving the convenience of inspecting the electric control module.

[0060] It is easy to understand that when the cover 7 is positioned vertically opposite the return air vent, the presence of the electronic control module may affect the flow of air entering through the return air vent. Therefore, in order to minimize this effect on the flow of air, in some embodiments, the structure of the cover 7 can be improved to prevent this from occurring.

[0061] Specifically, the covering portion 711 includes a first covering body 7111 and a second covering body 7112; the first covering body 7111 is located between the end cover 72 and the second covering body 7112, the second covering body 7112 is located between the first covering body 7111 and the connecting portion 712, and the second covering body 7112 is connected to the first end of the connecting portion 712; wherein, one end of the first covering body 7111 is connected to the second covering body 7112, and the other end of the first covering body 7111 extends upward and is connected to the end cover 72.

[0062] In this way, the connection between the covering portion 711 and the end cover 72 is not in the form of a right angle, but forms an oblique angle. Such a setting can avoid the airflow entering from the return air port to a certain extent, and to a certain extent avoid the influence of the setting of the cover body 7 on the air intake, thereby improving the performance of the indoor unit provided in this application.

[0063] Furthermore, the angle between the extension direction of the first covering body 7111 and the horizontal direction is greater than or equal to the angle between the flow direction of the airflow flowing in through the return air inlet and the horizontal direction. In this way, even if the airflow flowing in from the return air inlet collides with the first covering body 7111, if the angle between the extension direction of the first covering body 7111 and the horizontal direction is equal to the angle between the flow direction of the airflow flowing in through the return air inlet and the horizontal direction, the first covering body 7111 can still play a certain guiding role in the flow direction of the airflow; or, if the angle between the extension direction of the first covering body 7111 and the horizontal direction is greater than the angle between the flow direction of the airflow flowing in through the return air inlet and the horizontal direction, the airflow can continue to flow downstream along the original direction after colliding with the first covering body 7111.

[0064] Therefore, the structural design of the cover 7 not only achieves the goal of eliminating the box body, but also prevents the placement of the electronic control module from affecting the flow of gas. In addition, while meeting the goal of facilitating maintenance of the electronic control module, it also achieves an ultra-thin design of the electronic control module, thereby improving the height compactness of the indoor unit.

[0065] As shown in Figure 5 , since the electronic control board 6 is disposed within the accommodating cavity 8 , it is necessary to maintain a good seal between the cover 7 and the side panel 12 . Therefore, in some embodiments, the cover 71 further includes a flange 713 connected to the second end of the connecting portion 712 ; the flange 713 extends downward along the surface of the side panel 12 and contacts the side panel 12 . Thus, when the flange 713 contacts the side panel 12 , the seal between the flange 713 and the side panel 12 is improved, thereby maintaining a good seal between the cover 7 and the housing 1 .

[0066] When the mainboard bracket 5 is connected to the chassis 11, that is, in the vertical direction, the depth of the accommodating cavity 8 is approximately the same as the height of the indoor unit. In this case, two layers of electric control boards 6 can be arranged in the accommodating cavity 8, distributed in the vertical direction. Each layer of electric control boards 6 can include a circuit board 61 and electrical components arranged on the circuit board 61. In some embodiments, to facilitate the arrangement of the two layers of electric control boards 6, the electrical components in one layer of electric control boards 6 can be set as low-voltage components, and the electrical components in the other layer of electric control boards 6 can be set as high-voltage components. This facilitates the routing of the electric control boards 6.

[0067] It should be noted that the above-mentioned up and down directions are consistent with the up and down directions in Figures 1, 2 and 4.

[0068] As shown in FIG2 , to further enhance the compactness of the indoor unit provided in this embodiment, a wire clamp 10 may be provided on the mainboard bracket 5. The wire clamp 10 is configured to clamp the wire harness connected to the electronic control board 6. Integrating the wire clamp 10 on the mainboard bracket 5 thus further enhances the compactness of the indoor unit provided in this embodiment.

[0069] Furthermore, the mainboard bracket 5 is plate-shaped, and the extension direction of the mainboard bracket 5 coincides with the extension direction of the circuit board 61 of the electronic control board 6. This arrangement, compared to a configuration where the extension direction of the mainboard bracket 5 and the circuit board 61 is angled, further improves the compactness of the indoor unit in its height direction. The height direction of the indoor unit coincides with the vertical direction.

[0070] Please continue to refer to Figure 6, which is an enlarged schematic diagram of the partial structure at point C in Figure 1. A wire hole 73 is provided in the cover 7, which is configured to allow the wiring harness connected to the electronic control board 6 to pass through. The wire hole 73 can be provided in the end cap 72. Specifically, the wire hole 73 can be provided on both sides of the end cap 72 distributed along the length of the cover 7. By providing the wire hole 73 in the end cap 72, the wiring harness connected to the electronic control board 6 can pass through the accommodating cavity 8, ensuring normal electrical connection between the electronic control board 6 and other electrical components.

[0071] Please continue to refer to Figures 7 and 8. Figure 7 is a schematic diagram of the coordination relationship between the water receiving tray and the electronic control module in the indoor unit provided in an embodiment of the present application. Figure 8 is a schematic diagram of the structure of the water receiving tray in the indoor unit provided in an embodiment of the present application. In this embodiment, since the cover 7 and the fan are located on opposite sides of the heat exchanger, in order to avoid interference between the water receiving tray 4 and the structure of the electronic control module, a notch 41 needs to be provided on the water receiving tray 4. The notch 41 avoids the cover 7. In other words, a notch 41 needs to be provided on the water receiving tray 4 to avoid the electronic control module. In this way, by providing the notch 41, even after the electronic control module in this embodiment is installed on the chassis 11, it will not interfere with other structures or parts.

[0072] Typically, ceiling fans have at least one return air vent. To further improve heat dissipation efficiency for the electronic control module 6, the area occupied by the return air vent on the panel can partially overlap with the projection of the cover 7 on the panel. This allows airflow from the return air vent to flow to the electronic control module, removing heat generated by the module and further improving heat dissipation efficiency for the module.

[0073] This embodiment further provides a heating and ventilation system, including the indoor unit in the above embodiment. The indoor unit has been described in detail in the above embodiment and will not be described in detail here.

[0074] It should be noted that the HVAC system provided in this embodiment should also include other components or modules such as an outdoor unit. Here, other components or modules in the HVAC system provided in this embodiment will not be introduced one by one.

Claims

1. An indoor unit, wherein: include: a housing forming a mounting cavity; A mainboard bracket is located in the mounting cavity and connected to the housing; An electric control board is located in the installation cavity and connected to the mainboard bracket; as well as The cover body is located in the installation cavity and is connected to the shell. The cover body and the shell are combined to form a receiving cavity for accommodating the electric control board.

2. The indoor unit according to claim 1, wherein: The housing includes a panel and a casing, the bottom of the casing is open, and the panel cover is arranged at the opening to enclose the casing to form the installation cavity; The panel is provided with an air return port and an air outlet communicating with the installation cavity, and the air return port and the air outlet are spaced apart; Wherein, the cover is exposed by any one of the return air port and the outlet air port.

3. The indoor unit according to claim 2, wherein: The housing includes a chassis and a plurality of side panels arranged around the chassis; The chassis is arranged opposite to the panel, and the bottom surface of the chassis forms the top wall of the installation cavity, and the inner surface of the side panel forms the side wall of the installation cavity; The mainboard bracket is connected to the chassis, and the cover is connected to the chassis or the side panel.

4. The indoor unit according to claim 3, wherein: The cover body includes a cover plate and a plurality of end covers, wherein the plurality of end covers are arranged around the circumference of the cover plate; The cover plate is connected to the side plate, one end of the end cover is connected to the cover plate, and the other end of the end cover extends toward the bottom plate.

5. The indoor unit according to claim 4, wherein: The cover plate includes a covering portion and a connecting portion, and the end cover is connected to the covering portion; The first end of the connecting portion is connected to the covering portion, the second end of the connecting portion extends toward the side plate, and the connecting portion and the side plate are connected by a fastener; Wherein, the first end of the connecting portion is located above the second end of the connecting portion. The indoor unit according to claim 5, wherein: The return air port and the cover body are arranged opposite to each other in the up and down directions.

7. The indoor unit according to claim 5 or 6, wherein: The covering portion includes a first covering body and a second covering body; The first covering body is located between the end cover and the second covering body, the second covering body is located between the first covering body and the connecting portion, and the second covering body is connected to the first end of the connecting portion; Wherein, one end of the first covering body is connected to the second covering body, and the other end of the first covering body extends upward and is connected to the end cover.

8. The indoor unit according to claim 7, wherein: The angle between the extension direction of the first covering body and the horizontal direction is greater than or equal to the angle between the flow direction of the airflow flowing in through the return air port and the horizontal direction.

9. The indoor unit according to claim 7, wherein: It also includes a fan and a heat exchanger, both of which are located in the installation cavity; The cover and the fan are located on opposite sides of the heat exchanger, and a water receiving pan is provided below the heat exchanger; The water receiving tray is provided with a notch for avoiding the cover body.

10. The indoor unit according to claim 5, wherein The cover plate further includes a flange connected to the second end of the connecting portion; The flange extends downward along the plate surface direction of the side plate and contacts the side plate.

11. The indoor unit according to any one of claims 4 to 6, 8 to 9, wherein: In the length direction of the cover body, the mainboard bracket at least partially extends out of the cover body, and one end of the end cap away from the cover plate abuts against the surface of the mainboard bracket away from the chassis.

12. The indoor unit according to any one of claims 2 to 6 and 8 to 10, wherein: There is at least one return air outlet; The area occupied by the return air outlet on the panel partially overlaps with the projection area of ​​the cover on the panel.

13. The indoor unit according to any one of claims 1 to 6 and 8 to 10, wherein: The cover body is provided with a wire hole, and the wire hole is configured to allow a wire harness connected to the electric control board to pass through.

14. The indoor unit according to any one of claims 1 to 6 and 8 to 10, wherein: The mainboard bracket is provided with a wire clamp, and the wire clamp is configured to clamp a wire harness connected to the electric control board.

15. A heating and ventilation system, wherein: The indoor unit comprises the indoor unit according to any one of claims 1 to 14.

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