Indoor unit and heating, ventilation and air conditioning device

Abstract

The present application provides an indoor unit and a heating, ventilation and air conditioning device. The indoor unit provided in the present application is configured to regulate the air in an indoor space and comprises a housing, an electric control box, and a fan. An air channel is defined in the housing; the air channel comprises a fan cavity and an air suction port; the fan is arranged in the fan cavity; the fan drives external air to enter the fan cavity from the air suction port; the electric control box is mounted outside the housing; and part of the air suction port is located between the fan and the electric control box.

Description

Indoor unit and HVAC equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 11, 2024, with application number 202410046285.6, and invention name “Indoor unit and HVAC equipment”, 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 equipment using the indoor unit. Background Art

[0003] In related technologies, the indoor unit includes a casing, a fan and an electric control box, and the heat dissipation of the electric control box includes air cooling and refrigerant cooling.

[0004] However, during the use of the indoor unit, the electric control box needs to be frequently repaired or inspected. In the indoor units of related technologies, the heat dissipation effect of the electric control box is poor, and the maintenance of the electric control box is complex and time-consuming, and the installation process of the indoor unit is relatively complicated.

[0005] Therefore, it is necessary to invent relevant technical solutions to solve the above technical problems. Summary of the Invention

[0006] The embodiments of the present application provide an indoor unit and HVAC equipment, which are configured to solve the technical problems in the related art such as high complexity and long maintenance time of the electric control box, poor heat dissipation effect and complex installation process of the indoor unit.

[0007] In the first aspect, the present application provides an indoor unit, which is configured to regulate the air in an indoor space. The indoor unit includes a shell, an electrical control box and a fan. An air duct is defined in the shell, and the air duct includes a fan cavity and an air intake port. The fan is arranged in the fan cavity, and the fan drives the outside air into the fan cavity from the air intake port; the electrical control box is installed outside the shell, and part of the air intake port is located between the fan and the electrical control box.

[0008] As an optional embodiment, a heat dissipation channel is formed within the electrical control box, with the outlet end of the heat dissipation channel closer to the air intake than the inlet end of the heat dissipation channel. Thus, when the fan is running, it can draw external air into the heat dissipation channel. After passing through the heat dissipation channel, the air flows into the fan cavity through the air intake, thereby dissipating heat from within the electrical control box.

[0009] As an optional embodiment, the electric control box includes a box body, a box cover, and an electric control board assembly; the box body is connected to the housing, and the box cover is mounted on the box body, and the box cover and the box body define a housing cavity for accommodating the electric control board assembly; the box cover is provided with at least one first heat dissipation hole, which forms the air inlet end of a heat dissipation channel to connect the housing cavity with the outside world; the box body is provided with at least one second heat dissipation hole, which forms the air outlet end of the heat dissipation channel. Thus, by providing the first heat dissipation hole in the box cover and the second heat dissipation hole in the box body, a heat dissipation channel can be formed on the electric control box, and the heat dissipation channel connects the outside world with the fan cavity, so that heat dissipation airflow can enter the interior of the electric control box and dissipate heat generated by the electric control board assembly.

[0010] As an optional embodiment, at least a portion of at least one second heat dissipation hole is arranged toward the air inlet. In this way, the heat dissipation airflow flowing out of the second heat dissipation hole can quickly flow to the air inlet and then flow into the fan cavity through the air inlet.

[0011] As an optional embodiment, the box cover has a guide portion positioned adjacent to the air intake port, with the first heat dissipation hole formed on the guide portion. A guide surface is formed on the side of the guide portion facing away from the bottom of the accommodating chamber, extending obliquely toward the air intake port. This guide surface guides the airflow entering the first heat dissipation hole, allowing external air to quickly enter the accommodating chamber, thereby improving heat dissipation efficiency for the electrical control box.

[0012] As an optional embodiment, multiple first and second heat dissipation holes are provided, with the multiple first heat dissipation holes forming a first heat dissipation region, and the multiple second heat dissipation holes forming a second heat dissipation region. Thus, by providing multiple first and second heat dissipation holes, more heat dissipation airflow enters the interior of the electrical control box, dissipating the significant amount of heat generated by the electrical control board assembly, thereby improving the heat dissipation effect of the electrical control box, thereby improving the performance of both the electrical control box and the indoor unit provided herein.

[0013] As an optional embodiment, the first heat dissipation area is located in the middle of the air intake inlet in the height direction of the indoor unit. Because the airflow rate is greatest in the middle of the air intake, when the first heat dissipation area is located in the middle of the air intake, more heat dissipation air flows into the accommodating cavity through the multiple first heat dissipation holes, effectively dissipating the considerable heat generated by the electronic control board assembly.

[0014] As an optional embodiment, the second heat dissipation area is located within the height range of the air intake port in the height direction of the indoor unit. In this way, when the heat dissipation airflow flows out of the second heat dissipation hole, the airflow can flow directly into the fan cavity through the air intake port, shortening the flow path of the heat dissipation airflow and thus improving the heat dissipation efficiency of the electronic control box.

[0015] As an optional embodiment, along the length of the electrical control box, the coverage length of the first heat dissipation area and the coverage length of the second heat dissipation area fall within the same length segment. This ensures that the airflow through the multiple first heat dissipation holes and the multiple second heat dissipation holes is equivalent, allowing the heat dissipation airflow to flow out quickly, thereby improving the heat dissipation efficiency of the electrical control box. Furthermore, this facilitates the creation of the first and second heat dissipation holes, reducing the number of processing steps required for the electrical control box.

[0016] As an optional embodiment, the indoor unit is installed in an indoor space, and the indoor unit in the installed state is defined in a height direction, a length direction, and a width direction; the air intake port includes a first return air port and a second return air port that are connected, the first return air port extends at least along the length direction and the width direction, the second return air port extends at least along the length direction and the height direction, and the second return air port is located between the fan and the electrical control box; an installation cavity is formed on the outside of the shell, the installation cavity is connected to the fan cavity through the air intake port, and the electrical control box is installed in the first installation cavity. In this way, by forming a installation cavity on the outside of the shell and accommodating the electrical control box in the installation cavity, compared with arranging the electrical control box inside the shell, the structural compactness of the indoor unit provided by the present application can be improved and the size of the indoor unit can be reduced.

[0017] As an optional embodiment, the installation cavity opens downwards. In this way, when the grid on the ceiling is removed, the electric control box can be exposed, thereby facilitating the disassembly and maintenance of the electric control box.

[0018] As an optional embodiment, the indoor unit is mounted on the ceiling of the indoor space. The ceiling has an external return air vent located below the indoor unit, with at least a portion of the first return air vent overlapping the external return air vent along the height direction. This arrangement allows external air to quickly flow through the external return air vent and the first return air vent into the fan chamber during operation of the indoor unit, improving air flow efficiency and thereby enhancing the performance of the indoor unit.

[0019] As an optional embodiment, at least a portion of the mounting cavity overlaps with the external air return vent in the height direction. In other words, external air can directly enter the mounting cavity through the external air return vent to dissipate heat from the electrical control box, thereby improving the heat dissipation efficiency of the electrical control box.

[0020] As an optional embodiment, the outer return air port is an inspection port. In this way, when the electric control box is repaired, the grille at the inspection port is removed and the electric control box can be disassembled for inspection.

[0021] As an optional embodiment, the installation cavity has at least a first side wall and an exposure opening, the exposure opening being downwardly disposed and the first side wall facing the exposure opening; the electrical control box is mounted on the first side wall and exposed below the indoor unit through the exposure opening. Thus, by defining the positions of the first side wall and the exposure opening, the electrical control box can be exposed through the exposure opening after the grille at the inspection opening is removed, facilitating disassembly and maintenance of the electrical control box.

[0022] As an optional embodiment, the first sidewall extends in the height direction, and the first sidewall and the second return air inlet extend from bottom to top, approaching each other. Because the airflow drawn in by the fan extends from top to bottom, from near the second return air inlet to away from the second return air inlet, the extension direction of the first sidewall aligns with the flow direction of the airflow. This reduces resistance to airflow flowing within the electrical control box, accelerating the airflow and improving heat dissipation from the electrical control box.

[0023] As an optional embodiment, the installation cavity further includes a second sidewall connected to the first sidewall, with the first sidewall extending between the second return air inlet and the second sidewall. This arrangement confines the electrical control box between the second return air inlet and the second sidewall, ensuring easy access to the electrical control box and high heat dissipation efficiency while also improving the width-wise compactness of the indoor unit.

[0024] As an optional embodiment, the angle between the second side wall and the first side wall is greater than 90 degrees. This increases the opening area of ​​the air inlet of the installation cavity, thereby increasing the flow rate of the heat dissipation airflow into the installation cavity. The heat dissipation airflow then flows into the electrical control box, thereby increasing the flow rate of the heat dissipation airflow into the electrical control box, thereby improving the heat dissipation efficiency of the electrical control box. In addition, this configuration provides a larger space below the electrical control box, making it easier to disassemble and install the electrical control box.

[0025] As an optional embodiment, the exposed opening of the installation cavity gradually decreases from bottom to top. This increases the opening area at the air inlet of the installation cavity, allowing more cooling air to flow into the installation cavity and then into the electrical control box, thereby increasing the flow rate of cooling air flowing into the electrical control box and improving the heat dissipation efficiency of the electrical control box. In addition, this arrangement also increases the space below the electrical control box, making it easier to disassemble and install the electrical control box.

[0026] As an optional embodiment, the indoor unit provided herein also includes a protective grille, which is located at the air intake and connected to the housing. The protective grille not only protects the fan but also, to a certain extent, prevents damage to construction workers or users during assembly and disassembly of the electrical control box.

[0027] As an optional embodiment, the protective grille is spaced apart from the electrical control box in the width direction of the indoor unit. This, on the one hand, can prevent the protective grille from blocking the airflow into the first heat dissipation hole to a certain extent, and on the other hand, can prevent the protective grille from interfering with the removal and installation of the electrical control box to a certain extent. Therefore, this arrangement not only facilitates heat dissipation from the electrical control box, but also facilitates its removal and installation.

[0028] As an optional embodiment, the air intake includes a first and second connected air return inlet, with the first return inlet positioned toward the exterior return inlet on the ceiling, and the second return inlet located between the fan and the electrical control box. The protective grille includes a first and second connected grille sections, with the first grille section positioned at the first return inlet and the second grille section positioned at the second return inlet. Thus, protective grilles are provided at both the first and second return inlets, protecting the fan and the installer or user from both directions.

[0029] As an optional embodiment, the distance between the second grille portion and the electrical control box gradually decreases from bottom to top. This not only isolates the fan, but also increases the size of the air inlet of the installation cavity, allowing more air to flow to the electrical control box and then into the interior of the electrical control box, dissipating heat generated by the electrical control board assembly.

[0030] As an optional embodiment, the electric control box is detachably connected to the housing. This makes it easier to disassemble and assemble the electric control box, which not only improves the assembly efficiency of the indoor unit provided by this embodiment, but also improves the convenience of maintenance of the electric control box during later use.

[0031] As an optional embodiment, a positioning structure is provided between the electrical control box and the housing to limit the relative position of the two. This facilitates installation of the electrical control box on the housing. During installation, the positioning structure is used to align the electrical control box and the housing before connecting them. This improves convenience and reliability of the connection between the electrical control box and the housing.

[0032] As an optional embodiment, the positioning structure includes a positioning post and a positioning slot, with the positioning post inserted into the positioning slot. One of the positioning post and the positioning slot is provided on the side of the electrical control box facing the housing, while the other of the positioning post and the positioning slot is provided on the side of the housing facing the electrical control box. Thus, the coordination of the positioning post and the positioning slot allows the relative position of the electrical control box and the housing to be determined, facilitating subsequent connection between the electrical control box and the housing.

[0033] In a second aspect, the present application further provides an indoor unit, which is installed on the ceiling of an indoor space. The indoor unit installed on the ceiling is defined in a height direction, a length direction, and a width direction. The indoor unit includes a housing and an electric control box. The housing defines an air intake and an air outlet, and an air duct defined between the air intake and the air outlet. The air duct includes a fan chamber, a pressure diffusion chamber, and a heat exchange chamber in sequence along the width direction. At least a portion of the air intake is arranged on the front side of the fan chamber, and the air outlet is located on at least one side of the heat exchange chamber. The lower side of the outer configuration of the housing has an installation cavity recessed upward. The installation cavity is located between the fan chamber and the heat exchange chamber along the width direction. The exposed opening of the installation cavity faces downward and is connected to the air intake on the front side. At least a portion of the electric control box is located in the installation cavity, and at least a portion of the electric control box is exposed at the lower opening of the installation cavity and is connected to the air intake on the front side. Such an arrangement not only facilitates the disassembly and maintenance of the electric control box, but also facilitates the heat dissipation of the electric control box, thereby improving the performance of the indoor unit provided by the present application.

[0034] As an optional embodiment, the housing includes a first housing and a second housing, with a fan chamber, a pressure diffuser chamber, and a heat exchange chamber formed between the first and second housings. The fan chamber is formed between the rear portion of the first housing and the rear portion of the second housing, the pressure diffuser chamber is formed between the middle portion of the first housing and the middle portion of the second housing, and the heat exchange chamber is formed between the front portion of the first housing and the front portion of the second housing. The inner side surface of the middle portion of the second housing forms the bottom wall of the pressure diffuser chamber, and the outer side surface of the middle portion of the second housing forms the bottom wall of the mounting chamber. The electrical control box is mounted on the outer side surface of the middle portion of the second housing. This arrangement not only allows the electrical control box to be mounted outside the housing, improving its heat dissipation performance and ease of maintenance, but also maintains the width of the indoor unit, thereby improving the compactness of the indoor unit to a certain extent.

[0035] As an optional embodiment, the indoor unit provided herein further includes a protective grille, which is disposed at the air intake and connects the upstream end of the rear portion of the first housing to the upstream end of the rear portion of the second housing. The protective grille not only protects the fan but also, to a certain extent, prevents damage to construction workers or users during assembly and disassembly of the electrical control box.

[0036] As an optional embodiment, the upstream end of the rear portion of the first shell is lower than the upstream end of the rear portion of the second shell, and an air intake is defined between the upstream end of the rear portion of the first shell and the upstream end of the rear portion of the second shell. The air intake includes a first return air inlet and a second return air inlet. The first return air inlet is located at the lower side of the fan cavity and extends along the width direction, and the second return air inlet is located at the front side of the fan cavity and extends along the height direction. In this way, the position of the first return air inlet can be set adjacent to the inspection port on the ceiling. During the operation of the fan, the outdoor air can quickly enter the fan cavity through the inspection port and the first return air inlet in sequence, which can improve the flow efficiency of the airflow. Moreover, when the second return air inlet is located at the front side of the fan cavity, the heat emitted by the electrical control box can quickly flow into the fan cavity through the second return air inlet, thereby improving the heat dissipation effect of the electrical control box.

[0037] As an optional embodiment, the indoor unit is a ducted unit; the ducted unit has an air duct inlet and an air duct outlet. The air duct inlet is defined between the rear side of the heat exchange chamber and the rear side of the fan chamber, and the air duct outlet is defined by the air outlet. In this way, the ducted unit has locations for connecting the air inlet and outlet ducts, facilitating installation of the indoor unit provided by this application.

[0038] As an optional embodiment, the air duct inlet and outlet ports are both formed by connecting edges connected to the housing. In this way, the air duct inlet port can be connected to the nozzle of the air inlet duct, and the air duct outlet port can be connected to the nozzle of the air outlet duct, making it easier to connect the air inlet and outlet ducts to the indoor unit.

[0039] In a third aspect, the present application provides a HVAC device including the above-mentioned indoor unit.

[0040] In the indoor unit and HVAC equipment provided by the embodiment of the present application, the electric control box is arranged outside the shell, and part of the air intake is located between the fan and the electric control box. In this way, when the fan is running, the external airflow will be sucked into the electric control box. After the airflow passes through the electric control box, it flows into the fan cavity through the air intake. When the external airflow flows through the electric control box, it can carry the heat generated by the electric control box and flow into the fan cavity through the air intake, thereby achieving heat dissipation of the electric control box. Therefore, compared with the solution of arranging the electric control box inside the shell in the related art, the heat dissipation effect of the electric control box in the indoor unit provided by the embodiment of the present application is better; in addition, when the electric control box is installed on the outside of the shell, since the electric control box is exposed outside the shell, it is convenient to inspect or disassemble the electric control box for maintenance, thereby improving the performance of the indoor unit and HVAC equipment provided by the embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a schematic diagram of the three-dimensional structure of an indoor unit provided in an embodiment of the present application;

[0042] FIG2 is a schematic diagram of the three-dimensional structure of the indoor unit provided in an embodiment of the present application from another perspective;

[0043] FIG3 is an exploded view of an indoor unit provided in an embodiment of the present application;

[0044] FIG4 is a schematic structural diagram of a partial structure of an indoor unit provided in an embodiment of the present application;

[0045] FIG5 is a cross-sectional view of a partial structure of an indoor unit provided in an embodiment of the present application;

[0046] FIG6 is a schematic diagram of the structure of the electric control box in the indoor unit provided in an embodiment of the present application;

[0047] FIG7 is an enlarged schematic diagram of the local structure at point A in FIG5 ;

[0048] FIG8 is an enlarged schematic diagram of the local structure at point B in FIG5 ;

[0049] FIG9 is a schematic diagram of the connection structure between the second housing and the electric control box in the indoor unit provided in an embodiment of the present application;

[0050] FIG10 is a structural diagram of the positioning structure between the electric control box and the lower shell of the pressure diffuser chamber in the indoor unit provided in an embodiment of the present application.

[0051] Explanation of the accompanying symbols: 1. First housing; 2. Second housing; 3. Air duct; 4. Fan; 5. Heat exchanger; 6. Protective grille; 7. Foam board; 8. Sheet metal; 10. Indoor unit; 11. Fan chamber upper shell; 12. Diffuser chamber upper shell; 13. Heat exchange chamber upper shell; 14. Side panel; 21. Drain tray; 22. Diffuser chamber lower shell; 23. Mounting chamber; 31. Air inlet; 32. Fan chamber; 33. Diffuser chamber; 34. Heat exchange chamber; 36. Air outlet; 20. Electric control box; 30. Positioning column; 40. Positioning slot; 50. Housing; 61. First grille portion; 62. Second grille portion; 70. Heat dissipation channel; 80. Positioning structure; 90. Joint; 101. Air duct inlet interface; 102. Air duct outlet interface; 103. Front connecting edge; 104. Rear connecting edge; 105. Left connecting edge; 106. Right connecting edge; 211. Tray bottom wall; 212. Tray side wall; 231. First side wall; 232. Second side wall; 233. Exposed opening; 201. Box body; 202. Box cover; 203. Accommodating cavity; 204. Electronic control panel assembly; 311. First return air outlet; 312. Second return air outlet; 2018. Wire hole; 2019. Second heat dissipation hole; 2023. First heat dissipation hole; 2024. Air guide portion; 2025. Air guide surface. DETAILED DESCRIPTION

[0052] In related technologies, an indoor unit includes a housing, a fan, and an electronic control box. Heat dissipation from the electronic control box includes air cooling and refrigerant cooling. In one related technology for cooling the electronic control box, an air duct is formed within the housing, and both the fan and the electronic control box are positioned within the duct, thereby cooling the electronic control box with air. Alternatively, in another related technology for cooling the electronic control box, the housing has side panels on both sides along the fan's axis, and the electronic control box is mounted on the side panels and exposed outside the housing. Convection heat is dissipated from the electronic control box using external air, thereby achieving cooling.

[0053] However, during the use of the indoor unit, the electric control box needs to be frequently repaired or inspected. In the former indoor unit mentioned above, the electric control box is arranged in the air duct. When repairing the electric control box, the casing needs to be disassembled, which increases the complexity of repairing the electric control box and takes a long time to repair. In the latter indoor unit mentioned above, the electric control box is arranged on the side of the casing and exposed to the outside of the casing. The electric control box only relies on convection heat dissipation of the outside air, which reduces the heat dissipation effect of the electric control box. At the same time, a separate maintenance port must be set for the electric control box, which increases the complexity of the installation process of the indoor unit.

[0054] Therefore, the embodiment of the present application provides an indoor unit and HVAC equipment, which can reduce the maintenance complexity of the electrical control box, improve the maintenance efficiency of the electrical control box, improve the heat dissipation effect of the electrical control box, and improve the simplicity of the installation process of the indoor unit, thereby improving the performance of the HVAC equipment provided by the embodiment of the present application.

[0055] The embodiments of the present application will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0056] Please refer to Figures 1 to 3. Figure 1 is a schematic diagram of the three-dimensional structure of the indoor unit provided in an embodiment of the present application. Figure 2 is a schematic diagram of the three-dimensional structure of the indoor unit provided in an embodiment of the present application from another perspective. Figure 3 is an exploded view of the indoor unit provided in an embodiment of the present application. As shown in Figures 1 to 3, this embodiment provides an indoor unit 10 configured to condition the air in an indoor space. The indoor unit 10 includes a first housing 1, a second housing 2, a fan 4, a heat exchanger 5, and an electrical control box 20. The first housing 1 and the second housing 2 constitute a housing 50 of the indoor unit 10, and the first housing 1 and the second housing 2 cooperate to define an air duct 3.

[0057] Please continue to refer to Figure 4, which is a schematic diagram of the partial structure of the indoor unit provided in an embodiment of the present application. In conjunction with Figures 1 to 4, in some embodiments, the air duct 3 includes an air intake 31, a fan chamber 32, a pressure diffuser chamber 33, a heat exchange chamber 34, and an air outlet 36, which are sequentially connected. The fan 4 is disposed within the fan chamber 32 and drives external air from the air intake 31 into the fan chamber 32. The heat exchanger 5 is disposed within the heat exchange chamber 34.

[0058] Specifically, during the operation of the indoor unit 10, the fan 4 can suck the airflow of the indoor environment. The airflow enters the fan cavity 32 through the air inlet 31 in turn, passes through the pressure diffusion cavity 33 and the heat exchange cavity 34, and then flows out from the air outlet 36. The airflow exchanges heat with the heat exchanger 5 in the heat exchange cavity 34, and finally the airflow with changed temperature is discharged to the indoor environment.

[0059] In order to solve the problems of high maintenance complexity and poor heat dissipation of the electric control box 20 in the related art, in this embodiment, the electric control box 20 is arranged outside the housing 50, and part of the air intake 31 is located between the electric control box 20 and the fan 4. In this way, when the electric control box 20 is exposed outside the housing 50, the grille at the inspection port is removed to reveal the electric control box 20, making it easier to inspect or disassemble the electric control box 20 for maintenance. Moreover, when the fan 4 is running, it draws external air into the electric control box 20. After passing through the electric control box 20, the air flows into the fan cavity 32 through the air intake 31. When the external air flows through the electric control box 20, it can carry the heat generated by the electric control box 20 and flow into the fan cavity 32 through the air intake 31, thereby achieving heat dissipation of the electric control box 20 and improving the performance of the electric control box 20.

[0060] It should be noted that, in some embodiments, the above-mentioned first shell 1 can be connected to the top of the second shell 2. Since an external return air outlet is usually set on the ceiling below the second shell 2, in order to shorten the flow path of the external air flow to the electric control box 20 and achieve efficient heat dissipation of the electric control box 20, the electric control box 20 can be set below the second shell 2. In this way, the airflow entering through the external return air outlet can flow directly to the electric control box 20.

[0061] The outer return air port is formed as an inspection port of the indoor unit 10. It is understandable that a grille can be provided at the inspection port, and when the electric control box 20 is inspected or disassembled for maintenance, the grille at the inspection port needs to be removed before the electric control box 20 can be inspected or disassembled for maintenance.

[0062] Furthermore, during the operation of the indoor unit 10, external air needs to flow into the fan cavity 32. Therefore, the air intake 31 includes a first return air vent 311 and a second return air vent 312 that are connected. The first return air vent 311 is arranged to face the external return air vent, and the second return air vent 312 is located between the fan 4 and the electrical control box 20. In this way, during the operation of the motor 4, not only can the external air be drawn into the fan cavity 32 through the first return air vent 311, but the airflow after dissipating heat from the electrical control box 20 can also be drawn into the fan cavity 32 through the second return air vent 312. Under the condition of normal operation of the indoor unit 10, the electrical control box 20 can be effectively cooled.

[0063] In this embodiment, to shorten the airflow path and reduce the number of piping, the first return air vent 311 can be positioned toward the bottom of the indoor unit 10. In this case, the second return air vent 312 can be located in front of or behind the first return air vent 311. The positional relationship between the first return air vent 311 and the second return air vent 312 is not specifically limited.

[0064] When the indoor unit provided in this embodiment is installed in an indoor space, its height, length, and width are naturally formed. The height of the indoor unit is consistent with the zz-axis in Figure 1 , the length of the indoor unit is consistent with the xx-axis in Figure 1 , and the width of the indoor unit is consistent with the yy-axis in Figure 1 . The aforementioned up-down direction is consistent with the zz-axis in Figure 1 , and along the direction in Figure 1 , the top in Figure 1 is considered up, and the bottom in Figure 1 is considered down. The aforementioned front-to-back direction is consistent with the front-to-back direction in Figures 1 , 2 , and 4 .

[0065] In this embodiment, the first return air outlet 311 extends at least along the length direction and the width direction, and the second return air outlet 312 extends at least along the length direction and the height direction; it can be understood that the first return air outlet 311 extends along the horizontal plane direction, and the second return air outlet 312 extends along the vertical plane direction.

[0066] When the external return air vent is located below the indoor unit 10, at least a portion of the first return air vent 311 is arranged to overlap with the external return air vent in the height direction. With this arrangement, during operation of the indoor unit 10, external air can quickly flow through the external return air vent and the first return air vent 311 into the fan chamber 32, improving air flow efficiency and thereby enhancing the performance of the indoor unit 10 provided by this embodiment.

[0067] The following will be further described by taking the example of the electric control box 20 being installed below the second housing 2 .

[0068] Please continue to refer to Figures 5 and 6. Figure 5 is a cross-sectional view of the partial structure of the indoor unit provided in an embodiment of the present application, and Figure 6 is a schematic structural diagram of the electric control box in the indoor unit provided in an embodiment of the present application. Generally, the electric control box 20 includes a box body 201, a box cover 202, and an electric control board assembly 204, wherein the box body 201 is connected to the second shell 2, the box cover 202 is arranged on the side of the box body 201 facing the external return air outlet, and the box cover 202 and the box body 201 define a receiving cavity 203, and the electric control board assembly 204 is arranged in the receiving cavity 203. Therefore, the main heat emitter in the electric control box 20 should be the electric control board assembly 204, and in order to dissipate the heat generated by the electric control board assembly 204, the external air flow needs to flow into the receiving cavity 203, and then flow out through the receiving cavity 203 to the fan cavity 32.

[0069] Thus, a heat dissipation channel 70 can be formed in the electronic control box 20, and the air inlet end of the heat dissipation channel 70 is connected to the outside world, and the air outlet end of the heat dissipation channel 70 is connected to the fan cavity 32 through the air suction port 31, that is, the air outlet end of the heat dissipation channel 70 is closer to the air suction port 31 than the air inlet end of the heat dissipation channel 70. In this way, the fan 4 can draw the external airflow into the accommodating cavity 203 and carry the heat released by the electronic control board assembly 204 into the fan cavity 32.

[0070] Since the electric control panel assembly 204 needs to be electrically connected to other modules inside the indoor unit, a wire hole 2018 can be opened on the side wall of the box body 201 to allow the wire harness of the electric control panel assembly 204 to pass through and be electrically connected to other modules.

[0071] Please continue to refer to Figures 7 and 8. Figure 7 is an enlarged schematic diagram of the partial structure at point A in Figure 5, and Figure 8 is an enlarged schematic diagram of the partial structure at point B in Figure 5. To form the aforementioned heat dissipation channel 70, at least one first heat dissipation hole 2023 can be provided on the box cover 202. The first heat dissipation hole 2023 penetrates the box cover 202 and forms the air inlet end of the heat dissipation channel 70, thereby connecting the accommodating chamber 203 with the outside world. At least one second heat dissipation hole 2019 can be provided on the box body 201. The second heat dissipation hole 2019 forms the air outlet end of the heat dissipation channel 70. In this way, when the fan 4 is running, external air can flow into the accommodating chamber 203 through the first heat dissipation hole 2023, then flow out of the accommodating chamber 203 through the second heat dissipation hole 2019 along with the heat dissipated by the electronic control board assembly 204, and then flow into the fan chamber 32 through the second return air port 312 to dissipate heat from the electronic control box 20.

[0072] Furthermore, at least a portion of the at least one second heat dissipation hole 2019 is disposed toward the air intake port 31, that is, at least a portion of the at least one second heat dissipation hole 2019 is disposed toward the second air return port 312. With this arrangement, the heat dissipation airflow from the second heat dissipation hole 2019 can quickly flow to the second air return port 312 and then flow into the fan chamber 32 through the second air return port 312.

[0073] At the air inlet end of the heat dissipation channel 70, that is, at the location of the first heat dissipation hole 2023, in order to speed up the speed of the airflow flowing into the accommodating cavity 203 through the first heat dissipation hole 2023, a guide portion 2024 can be formed on the box cover 202, and the guide portion 2024 is arranged close to the second return air port 312, and the first heat dissipation hole 2023 is opened on the guide portion 2024; and a guide surface 2025 is formed on the side of the guide portion 2024 facing away from the bottom of the accommodating cavity 203, and the guide surface 2025 extends obliquely toward the air intake port 31.

[0074] Specifically, the guide surface 2025 extends obliquely toward the second air return port 312. Thus, when air flows into the first heat dissipation holes 2023, the airflow is guided by the guide surface 2025 in a predetermined direction, thereby reducing resistance to the airflow to a certain extent. The airflow can then flow more quickly through the first heat dissipation holes 2023 into the accommodating cavity 203, thereby improving the heat dissipation efficiency of the electrical control box 20.

[0075] In order to speed up the flow of airflow, in some optional embodiments, both the first heat dissipation holes 2023 and the second heat dissipation holes 2019 can be multiple, and the multiple first heat dissipation holes 2023 form a first heat dissipation area, and the multiple second heat dissipation holes 2019 form a second heat dissipation area; and the multiple first heat dissipation holes 2023 and the multiple second heat dissipation holes 2019 are arranged in rows and columns, wherein the arrangement in rows and columns can be understood as the multiple first heat dissipation holes 2023 are multiple rows in the thickness direction of the electric control box 20, and the multiple first heat dissipation holes 2023 are multiple columns in the length direction of the electric control box 20, and the arrangement method of the multiple second heat dissipation holes 2019 can be the same as the arrangement method of the multiple first heat dissipation holes 2023, that is, the multiple second heat dissipation holes 2019 are multiple rows in the thickness direction of the electric control box 20, and the multiple second heat dissipation holes 2019 are multiple columns in the length direction of the electric control box 20.

[0076] Through the above-mentioned arrangement, the airflow can not only quickly flow into the accommodating cavity 203 through the first heat dissipation hole 2023, but also quickly flow out of the accommodating cavity 203 through the second heat dissipation hole 2019. Moreover, if more airflow flows into the accommodating cavity 203 through the first heat dissipation hole 2023, more heat generated by the electric control board assembly 204 can be carried out of the accommodating cavity 203, thereby improving the heat dissipation effect of the electric control box 20.

[0077] It should be noted that the thickness direction of the above-mentioned electric control box 20 is consistent with the zz-axis direction in Figures 2 to 6, and the length direction of the above-mentioned electric control box 20 is consistent with the length direction of the indoor unit 10, that is, the xx-axis direction in Figure 1.

[0078] It can be understood that during the operation of the fan 4, along the height direction of the indoor unit 10, that is, the up and down direction in the figure, the air volume in the middle of the air intake port 31 is the largest, that is, the air volume in the middle of the second return air port 312 is larger.

[0079] Furthermore, to increase the air flow rate into the accommodating chamber 203 through the first heat dissipation holes 2023, the first heat dissipation area is located in the middle of the air intake 31 in the height direction of the indoor unit 10, that is, the first heat dissipation area is located in the middle of the second air return vent 312. This further increases the air flow rate into the accommodating chamber 203 through the first heat dissipation holes 2023, and the considerable heat generated by the electronic control board assembly 204 can be extracted.

[0080] As for the second heat dissipation area, if the location of the second heat dissipation area is outside the height range of the air intake port 31, when the air flow flows out through the second heat dissipation hole 2019 and flows into the fan cavity 32 through the second return air port 312, the direction of the air flow will change, which will increase the resistance of the gas during the flow process and reduce the heat dissipation efficiency of the electrical control box 20.

[0081] Therefore, in some embodiments, the second heat dissipation area is located within the height range of the air intake port 31 in the height direction of the indoor unit 10, that is, the second heat dissipation area is located within the height range of the second air return port 312. In this way, after the airflow passes through the second heat dissipation holes 2019, it can directly flow into the second air return port 312 and then into the fan cavity 32, which can reduce the resistance encountered by the airflow during the flow process, thereby accelerating the flow of air and improving the heat dissipation efficiency of the electronic control box 20.

[0082] Referring to Figure 6 , since both the first and second heat dissipation areas have a certain coverage area along the length of the electrical control box 20, to facilitate the placement of the first and second heat dissipation holes 2023, 2019, the coverage length of the first and second heat dissipation areas falls within the same length segment along the length of the electrical control box 20. This ensures that the airflow through the plurality of first heat dissipation holes 2023 and the plurality of second heat dissipation holes 2019 is comparable, allowing the cooling airflow to flow out quickly, thereby improving the heat dissipation efficiency of the electrical control box 20. Furthermore, this facilitates the placement of the first and second heat dissipation holes 2023, 219, reduces the number of manufacturing steps required for the electrical control box 20, and optimizes the appearance of the electrical control box 20.

[0083] It should be noted that the first heat dissipation holes 2023 and the second heat dissipation holes 2019 can be round holes or square holes, etc. Here, there is no specific limitation on the shapes of the first heat dissipation holes 2023 and the second heat dissipation holes 2019.

[0084] When the electrical control box 20 is disposed below the second housing 2, in order to avoid increasing the size of the indoor unit 10 in the height direction, an upwardly recessed mounting cavity 23 can be provided at the bottom of the second housing 2. The mounting cavity 23 is connected to the fan cavity 32 via the air intake 31. The mounting cavity 23 includes a first side wall 231, a second side wall 232, and an exposed opening 233, which are connected together. The exposed opening 233 is disposed downward, and the first side wall 231 is disposed facing the exposed opening 233. The first side wall 231 extends between the second return air inlet 312 and the second side wall 232, and the second side wall 232 is disposed toward the second return air inlet 312. The electrical control box 20 is mounted on the first side wall 231. In this way, the electrical control box 20 can be accommodated in the mounting cavity 23 without changing the height of the indoor unit 10, thereby improving the structural compactness of the indoor unit 10 provided in this embodiment.

[0085] In some optional embodiments, the mounting cavity 23 opens downward. In this way, when the grid on the ceiling is removed, the electric control box 20 can be exposed, thereby facilitating the disassembly and maintenance of the electric control box 20.

[0086] As can be seen above, the mounting cavity 23 is located to the side of the first return air vent 311, and the first return air vent 311 and the external return air vent overlap in height. In some optional embodiments, at least a portion of the mounting cavity 23 also overlaps in height with the external return air vent. This allows external airflow to enter the mounting cavity 23 directly through the external return air vent, dissipating heat from the electrical control box 20 and improving heat dissipation efficiency.

[0087] In order to form the above-mentioned air intake 31, fan cavity 32, pressure diffuser cavity 33, heat exchange cavity 34 and air outlet 36, in some specific embodiments, the first shell 1 includes a fan cavity upper shell 11, a pressure diffuser cavity upper shell 12, a heat exchange cavity upper shell 13 and two side panels 14 located on the first shell 1 along the length direction of the indoor unit 10, wherein the fan cavity upper shell 11, the pressure diffuser cavity upper shell 12 and the heat exchange cavity upper shell 13 are integrally formed to form an upper cover, and the two side panels are respectively connected to both sides of the first shell 1 along the length direction of the indoor unit 10, and the bottom surface of the fan cavity upper shell 11 defines the cavity top wall of the fan cavity 32, the bottom surface of the pressure diffuser cavity upper shell 12 defines the cavity top wall of the pressure diffuser cavity 33, and the bottom surface of the heat exchange cavity upper shell 13 defines the cavity top wall of the heat exchange cavity 34.

[0088] Please continue to refer to Figure 9, which is a schematic diagram of the connection structure between the second housing and the electronic control box in the indoor unit provided by an embodiment of the present application. Furthermore, the second housing 2 includes an integrally formed water receiving tray 21 and a pressure diffuser lower shell 22. The water receiving tray 21 defines the bottom wall of the heat exchange chamber 34. The water receiving tray 21 includes a tray bottom wall 211 and a tray side wall 212. The tray side wall 212 is connected between the pressure diffuser lower shell 22 and the tray bottom wall 211 to form the aforementioned second side wall 232. The top surface of the pressure diffuser lower shell 22 defines the bottom wall of the pressure diffuser chamber 33, and the bottom surface of the pressure diffuser lower shell 22 forms the aforementioned first side wall 231.

[0089] Furthermore, in order to avoid condensation water adhering to the outside of the water receiving tray 21 to a certain extent, a foam plate 7 can be set at the bottom of the water receiving tray 21, and a sheet metal part 8 can be set at the bottom of the foam plate 7 to clamp the foam plate 7 between the water receiving tray 21 and the sheet metal part 8, and the sheet metal part 8 and the water receiving tray 21 are detachably connected by screws and other threaded fasteners to install the foam plate 7 and the sheet metal part 8 together on the water receiving tray 21.

[0090] Since the electrical control box 20 is installed on the first side wall 231, in order to improve the heat dissipation efficiency of the electrical control box 20, the flow resistance of the airflow in the electrical control box 20 can be reduced. For example, the extension direction of the bottom wall of the accommodating cavity 203 is set to be close to the flow direction of the airflow. Since the electrical control box 20 is installed on the first side wall 231, the extension direction of the first side wall 231 can be set to be close to the flow direction of the airflow.

[0091] Therefore, in some optional embodiments, the first side wall 231 extends in the height direction, and the first side wall 231 and the second air return port 312 extend from bottom to top close to each other. In this way, the extension direction of the first side wall 231 is closer to the flow direction of the airflow, which can reduce the flow resistance of the airflow in the accommodating cavity 203, increase the flow speed of the airflow, and thus improve the heat dissipation efficiency of the electrical control box 20.

[0092] Furthermore, to facilitate installation of the electric control box 20 on the first side wall 231, the wall surface of the first side wall 231 can be configured as an inclined wall surface. This not only reduces the flow resistance of the airflow within the accommodating cavity 203, but also improves the smoothness of the surface of the first side wall 231, thereby facilitating installation of the electric control box 20.

[0093] It should be noted that in some embodiments, the electrical control box 20 and the diffuser chamber lower shell 22 may be detachably connected. Specifically, the box body 201 and the diffuser chamber lower shell 22 may be detachably connected, for example, via a screw connection and / or a snap connection. It is understood that the electrical control box 20 and the diffuser chamber lower shell 22 may be detachably connected via a screw connection, a snap connection, or a combination of both. The connection method between the box body 201 of the electrical control box 20 and the diffuser chamber lower shell 22 is not specifically limited.

[0094] Generally, when the electric control box 20 is inspected and repaired, the electric control board assembly 204 inside is inspected and repaired. Therefore, to facilitate the inspection and repair of the electric control board assembly 204, in this embodiment, the box cover 202 and the box body 201 can also be connected in a detachable manner. In this way, if the problem with the electric control board assembly 204 is not serious, only the box cover 202 can be removed from the box body 201 to inspect and repair the electric control board assembly 204.

[0095] Please continue to refer to Figure 10, which is a schematic diagram of the structure of the positioning structure between the electric control box and the lower shell of the pressure diffuser chamber in the indoor unit provided by an embodiment of the present application. In order to improve the installation efficiency between the electric control box 20 and the second shell 2, a positioning structure 80 can be set between the electric control box 20 and the first side wall 231. The positioning structure 80 is configured to limit the relative position between the electric control box 20 and the lower shell 22 of the pressure diffuser chamber. In this way, when installing the electric control box 20 and the lower shell 22 of the pressure diffuser chamber, the position between the electric control box 20 and the lower shell 22 of the pressure diffuser chamber can be determined first, and then the electric control box 20 and the lower shell 22 of the pressure diffuser chamber can be connected together through the above-mentioned screw connection structure and snap connection structure.

[0096] In some optional embodiments, the positioning structure 80 includes a positioning column 30 and a positioning groove 40, and the positioning column 30 is inserted into the positioning groove 40; the side of the box body 201 of the electrical control box 20 facing the second shell 2 is provided with one of the positioning column 30 and the positioning groove 40, and the side of the lower shell 22 of the diffusion chamber facing the box body 201 is provided with the other of the positioning column and the positioning groove.

[0097] In the specific implementation of this embodiment, the axial direction of the positioning post 30 is aligned with the thickness direction of the electrical control box 20, and the depth direction of the positioning groove 40 is also aligned with the depth direction of the electrical control box 20. The positioning post 30 is provided on the box body 201, and the positioning groove 40 is provided on the diffuser chamber lower shell 22. Thus, when installing the electrical control box 20 on the diffuser chamber lower shell 22, the positioning post 30 can be aligned with the positioning groove 40 first, and then the electrical control box 20 and the diffuser chamber lower shell 22 can be connected together using the aforementioned screw connection structure and / or snap connection structure.

[0098] In order to further improve the installation efficiency of the electric control box 20, a plurality of positioning posts 30 and a plurality of positioning slots 40 corresponding to the plurality of positioning posts 30 may be provided. Here, the number of positioning posts 30 and the number of positioning slots 40 are not limited.

[0099] In some embodiments, to increase the amount of air flowing into the air intake side of the installation cavity 23, the angle between the first side wall 231 and the second side wall 232 can be limited to increase the opening of the air intake side of the installation cavity 23. Thus, the angle between the second side wall 232 and the first side wall 231 can be greater than 90 degrees. This increases the opening of the air intake side of the installation cavity 23, increasing the amount of air flowing into the electrical control box 20 and allowing more heat generated by the electrical control board assembly 204 to be carried out of the accommodating cavity 203.

[0100] In other embodiments, the opening size of the mounting cavity 23 can be restricted to control the amount of airflow into the electrical control box 20. Specifically, the opening of the mounting cavity 23 gradually decreases from bottom to top. In other words, the opening at the bottom of the mounting cavity 23 is larger, and the opening at the bottom of the mounting cavity 23 is the air inlet side of the mounting cavity 23. Therefore, by restricting the opening size of the mounting cavity 23, the airflow on the air inlet side of the mounting cavity 23 can be increased, thereby improving the heat dissipation effect on the electrical control box 20.

[0101] Referring to Figures 2 and 4 , in some embodiments, to prevent damage to personnel caused by the fan 4 and to protect the fan 4 to a certain extent, a protective grille 6 may be provided at the air intake 31. One side of the protective grille 6 is connected to the fan chamber upper shell 11, and the other side of the protective grille 6 is connected to the diffuser chamber lower shell 22. Thus, by providing a grille at the air intake 31, damage to personnel caused by the fan 4 can be prevented to a certain extent when installing or removing the electrical control box 20. The grille also protects the fan 4 and improves its performance. Furthermore, it can prevent larger insects or foreign objects from entering the fan chamber 32 through the air intake 31 to a certain extent.

[0102] The installation of the protective grille 6 may affect the airflow into the installation cavity 23. To prevent this, the protective grille 6 is spaced apart from the electrical control box 20 in the width direction of the indoor unit 10. This significantly reduces the airflow into the installation cavity 23 even with the protective grille 6, thereby improving the heat dissipation of the electrical control box 20. Furthermore, the protective grille 6 can also prevent interference with the installation or removal of the electrical control box 20 to a certain extent.

[0103] Specifically, to protect both the first and second return air outlets 311, 312, the protective grille 6 may include a first grille portion 61 and a second grille portion 62 connected together. The first grille portion 61 is provided at the first return air outlet 311, and the second grille portion 62 is provided at the second return air outlet 312. In this way, the entire air intake 31 can be protected and blocked by the protective grille 6, thereby enhancing the protective effect of the protective grille 6 on the fan 4.

[0104] Similarly, to maintain the airflow on the inlet side of the installation cavity 23, the distance between the second grille portion 6 and the electrical control box 20 can be limited. For example, the distance between the second grille portion 6 and the electrical control box 20 can be gradually reduced from bottom to top across the width of the indoor unit 10. In other words, the distance between the electrical control box 20 and the second grille portion 6 is greatest on the inlet side of the installation cavity 23. This increases the airflow on the inlet side of the installation cavity 23, further minimizing the impact of the protective grille 6 on heat dissipation from the electrical control box 20.

[0105] Furthermore, the indoor unit 10 provided in this embodiment can be a ducted unit having an air duct inlet port 101 and an air duct outlet port 102. The air duct inlet port 101 is defined between the rear side of the heat exchange chamber 34 and the rear side of the fan chamber 32. In other words, the air intake port 31 and the mounting chamber 23 fall within the width of the air duct inlet port 102.

[0106] Regarding the air duct inlet port 101, in some specific embodiments, a connecting edge 90 extends vertically downward from the rear side of the sheet metal component. This connecting edge 90 forms a front connecting edge 103 of the air duct inlet port 101. A connecting edge 90 extends vertically downward from the rear portion of the first housing 1 (i.e., the rear shell of the fan chamber 32). This connecting edge 90 is defined as a rear connecting edge 104 of the air duct inlet port 101. The air inlet duct (not shown) is fixedly connected to the front connecting edge 103 and the rear connecting edge 104, respectively.

[0107] Furthermore, the air duct inlet port 101 has a left edge 105 and a right edge 106 on either side, and the left edge 105 and the right edge 106 are connected front to back to the front edge 103 and the rear edge 104. In some embodiments, the front edge 103, the rear edge 104, the left edge 105, and the right edge 106 are connected end to end to form a rectangular structure, and the air inlet duct is fixedly connected to the rectangular port.

[0108] Regarding the air duct outlet interface 102 , in some specific embodiments, a plurality of connecting edges 90 may be provided protruding from the edge of the air outlet 36 , and the air outlet duct (not shown) is fixedly connected to the plurality of connecting edges 90 .

[0109] This embodiment also provides a heating and ventilation system, including the indoor unit 10 of the above embodiment. It should be noted that the indoor unit 10 has been described in detail in the above embodiment and will not be described in detail here. The heating and ventilation system provided in this embodiment should also include an outdoor unit, the structure of which is not specifically limited herein.

Claims

1. An indoor unit, configured to condition air in an indoor space, wherein, The indoor unit includes a housing, an electric control box, and a blower. A duct is defined within the housing. The duct includes a blower chamber and an air suction opening. The blower is disposed within the blower chamber, and the blower drives outside air to enter the blower chamber from the air suction opening. The electric control box is installed outside the housing, and part of the air suction opening is located between the blower and the electric control box.

2. The indoor unit according to claim 1, wherein, The electric control box forms a heat dissipation channel, and the air outlet end of the heat dissipation channel is closer to the air suction opening than the air inlet end of the heat dissipation channel.

3. The indoor unit according to claim 2, wherein, The electric control box includes a box body, a box cover, and an electric control board assembly. The box body is connected to the housing. The box cover covers the box body, and the box cover and the box body define a receiving cavity for receiving the electric control board assembly. At least one first heat dissipation hole is formed in the box cover, and the first heat dissipation hole forms the air inlet end of the heat dissipation channel. At least one second heat dissipation hole is formed in the box body, and the second heat dissipation hole forms the air outlet end of the heat dissipation channel.

4. The indoor unit according to claim 3, wherein at least part of at least one of the second heat dissipation holes is disposed facing the air suction opening.

5. The indoor unit according to claim 3, wherein, The box cover has a guiding portion disposed adjacent to the air suction opening, and the first heat dissipation hole is formed in the guiding portion. A guiding surface is formed on a side of the guiding portion facing away from the bottom of the receiving cavity, and the guiding surface extends obliquely toward the air suction opening.

6. The indoor unit according to claim 3, wherein, Both the first heat dissipation holes and the second heat dissipation holes are multiple. The multiple first heat dissipation holes form a first heat dissipation area, and the multiple second heat dissipation holes form a second heat dissipation area.

7. The indoor unit according to claim 6, wherein, In the height direction of the indoor unit, the first heat dissipation area is located at the middle position of the air suction opening; and / or In the height direction of the indoor unit, the position where the second heat dissipation area is located is within the height range where the air suction opening is located.

8. The indoor unit according to claim 7, wherein, In the length direction of the electric control box, the covering length of the first heat dissipation area and the covering length of the second heat dissipation area fall within the same length segment.

9. The indoor unit according to claim 1, wherein, The indoor unit is installed in an indoor space. The installed indoor unit defines a height direction, a length direction, and a width direction. The air suction opening includes a first air return opening and a second air return opening. The first air return opening extends at least along the length direction and the width direction. The second air return opening extends at least along the length direction and the height direction. The second air return opening is located between the blower and the electric control box. An installation cavity is formed on the outer side of the housing. The installation cavity is communicated with the blower chamber through the air suction opening, and the electric control box is installed in the installation cavity.

10. The indoor unit according to claim 9, wherein, The installation cavity opens downward.

11. The indoor unit according to claim 9, wherein, The indoor unit is installed on the ceiling of the indoor space. The ceiling has an external air return opening. The external air return opening is located below the indoor unit, and at least part of the first air return opening overlaps with the external air return opening along the height direction.

12. The indoor unit according to claim 11, wherein, At least part of the installation cavity overlaps with the external air return opening along the height direction.

13. The indoor unit according to claim 12, wherein, The external air return opening is the maintenance opening of the indoor unit.

14. The indoor unit according to claim 9, wherein, The installation cavity has at least a first side wall and an exposure opening. The exposure opening is disposed downward, and the first side wall faces the exposure opening. The electronic control box is installed on the first side wall and is exposed below the indoor unit through the exposed opening.

15. The indoor unit according to claim 14, wherein, The first side wall extends along the height direction, and the first side wall and the second air return opening extend closer to each other from bottom to top.

16. The indoor unit according to claim 15, wherein, The installation cavity further includes a second side wall, the second side wall is connected to the first side wall, and the first side wall extends between the second air return opening and the second side wall.

17. The indoor unit according to claim 16, wherein, The included angle between the second side wall and the first side wall is greater than 90 degrees.

18. The indoor unit according to claim 14, wherein, The exposed opening gradually decreases from bottom to top.

19. The indoor unit according to claim 1, wherein, It further includes a protective grille, and the protective grille is arranged at the air suction opening and is connected to the housing.

20. The indoor unit according to claim 19, wherein, In the width direction of the indoor unit, the protective grille and the electronic control box are arranged at intervals.

21. The indoor unit according to claim 19, wherein, The air suction opening includes a first air return opening and a second air return opening that are communicated, the first air return opening is arranged to face the external air return opening on the ceiling, and the second air return opening is located between the blower and the electronic control box; The protective grille includes a first grille part and a second grille part connected together, the first grille part is arranged at the first air return opening, and the second grille part is arranged at the second air return opening.

22. The indoor unit according to claim 21, wherein, The distance between the second grille part and the electronic control box gradually decreases from bottom to top.

23. The indoor unit according to any one of claims 1 to 22, wherein, The electronic control box is detachably connected to the housing.

24. The indoor unit according to claim 23, wherein, A positioning structure is provided between the electronic control box and the housing, and the positioning structure is arranged to limit the relative position between the electronic control box and the housing.

25. The indoor unit according to claim 24, wherein, The positioning structure includes a positioning post and a positioning groove, and the positioning post is inserted into the positioning groove; One of the positioning post and the positioning groove is provided on the side of the electronic control box facing the housing, and the other of the positioning post and the positioning groove is provided on the side of the housing facing the electronic control box.

26. An indoor unit is installed on the ceiling of an indoor space, wherein, The indoor unit installed on the ceiling defines a height direction, a length direction and a width direction, and the indoor unit includes: A housing, an air suction opening and an air outlet are defined in the housing, and an air duct is defined between the air suction opening and the air outlet. The air duct sequentially includes a blower cavity, a diffuser cavity and a heat exchange cavity along the width direction. At least part of the air suction opening is arranged on the front side of the blower cavity, and the air outlet is located on at least one side of the heat exchange cavity; The lower side of the external configuration of the housing has an installation cavity recessed upward, the installation cavity is located between the blower cavity and the heat exchange cavity along the width direction, and the exposed opening of the installation cavity faces downward and is communicated with the air suction opening at the front side; An electronic control box, at least part of the electronic control box is located in the installation cavity, and at least part of the electronic control box is exposed through the lower opening of the installation cavity and is communicated with the air suction opening at the front side.

27. The indoor unit according to claim 26, wherein, The housing includes a first housing and a second housing, a blower cavity, a diffuser cavity and a heat exchange cavity are formed between the first housing and the second housing, the blower cavity is formed between the rear side parts of the first housing and the second housing, the diffuser cavity is formed between the middle parts of the first housing and the second housing, and the heat exchange cavity is formed between the front side parts of the first housing and the second housing. The inner side surface of the middle part of the second housing forms the bottom wall of the diffuser chamber, and the outer side surface of the middle part of the second housing forms the bottom wall of the installation chamber. The electronic control box is installed on the outer side surface of the middle part of the second housing.

28. The indoor unit according to claim 27, wherein, It further includes a protective grille, which is arranged at the air inlet and connects the upstream ends of the rear side parts of the first housing and the second housing.

29. The indoor unit according to claim 28, wherein, The upstream end of the rear side part of the first housing is lower than the upstream end of the rear side part of the second housing. The air inlet is defined between the upstream end of the rear side part of the first housing and the upstream end of the rear side part of the second housing. The air inlet includes a first air return opening and a second air return opening. The first air return opening is located on the lower side of the fan chamber and extends along the width direction, and the second air return opening is located on the front side of the fan chamber and extends along the height direction.

30. The indoor unit according to any one of claims 26 to 29, wherein, The indoor unit is a ducted air conditioner; The ducted air conditioner has a duct air inlet interface and a duct air outlet interface. The duct air inlet interface is defined between the rear side of the heat exchange chamber and the rear side of the fan chamber, and the duct air outlet interface is defined by the air outlet.

31. The indoor unit according to claim 30, wherein, Both the duct air inlet interface and the duct air outlet interface are formed by the connecting edges connected to the housing.

32. A heating, ventilation and air conditioning equipment, wherein, It includes the indoor unit according to any one of claims 1 to 25 or the indoor unit according to any one of claims 26 to 31.

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