Indoor unit and heating and ventilation equipment

Abstract

The invention provides an indoor unit and heating and ventilation equipment, the indoor unit is used for adjusting air in an indoor space, the indoor unit comprises a shell, an electric control box and a draught fan, an air channel is defined in the shell and comprises a draught fan cavity and an air suction opening, the draught fan is arranged in the draught fan cavity, and the air suction opening is formed in the shell; the fan drives external air to enter the fan cavity from the air suction opening; the electric control box is installed outside the shell, and part of the exhaust inlet is located between the draught fan and the electric control box. The electric control box in the indoor unit is convenient to maintain and good in heat dissipation effect.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, and in particular to an indoor unit and a heating, ventilation and air conditioning (HVAC) device using the same. Background Art

[0002] In the related art, an indoor unit includes a housing, a fan and an electric control box. The heat dissipation of the electric control box includes air cooling and refrigerant heat dissipation, etc. In a related art of the heat dissipation of the electric control box, an air duct is formed inside the housing, and both the fan and the electric control box are arranged in the air duct, so as to perform air cooling on the electric control box; alternatively, in another related art of the heat dissipation of the electric control box, both sides of the housing along the axial direction of the fan have side plates, and the electric control box is installed on the side plates and exposed outside the housing, and the outside air is used to perform convective heat dissipation on the electric control box, so as to achieve the purpose of temperature reduction.

[0003] However, during the use of the indoor unit, the electric control box needs to be frequently repaired or inspected. In the former indoor unit, the electric control box is arranged in the air duct. When repairing the electric control box, the housing needs to be disassembled, which will make the repair complexity of the electric control box relatively high and the repair time relatively long; in the latter indoor unit, the electric control box is arranged on the side of the housing and exposed outside the housing, and only the outside air is used to perform convective heat dissipation on the electric control box, so that the heat dissipation effect of the electric control box is relatively poor. At the same time, a separate repair opening needs to be provided for the electric control box, which makes the installation process of the whole indoor unit relatively complicated.

[0004] Therefore, it is necessary to invent related technical solutions to solve the above technical problems. Summary of the Invention

[0005] The embodiments of this application provide an indoor unit and an HVAC device, which are used to solve the technical problems in the related art that the repair complexity of the electric control box is relatively high and the repair time is relatively long, the heat dissipation effect is poor, and the installation process of the whole indoor unit is relatively complicated.

[0006] In a first aspect, this application provides an indoor unit for adjusting the air in an indoor space. The indoor unit includes a housing, an electric control box and a fan. An air duct is defined inside the housing. The air duct includes a fan cavity and an air suction port. The fan is arranged in the fan cavity, and the fan drives the outside air to enter the fan cavity from the air suction port; the electric control box is installed outside the housing, and part of the air suction port is located between the fan and the electric control box.

[0007] As an optional implementation manner, a heat dissipation channel is formed inside the electric control box, and the air outlet end of the heat dissipation channel is closer to the air suction port than the air inlet end of the heat dissipation channel. In this way, when the fan is running, the external air flow can be sucked into the heat dissipation channel, and after the air flow passes through the heat dissipation channel, it flows into the fan cavity through the air suction port, so as to dissipate the heat inside the electric control box.

[0008] 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 shell, the box cover is arranged on 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 provided on the box cover, and the first heat dissipation hole forms the air inlet end of the heat dissipation channel to connect the receiving cavity with the outside world; at least one second heat dissipation hole is provided on the box body, and the second heat dissipation hole forms the air outlet end of the heat dissipation channel. In this way, by providing the first heat dissipation hole on the box cover and the second heat dissipation hole on the box body, a heat dissipation channel connecting the outside world with the fan cavity can be formed on the electric control box, so that the heat dissipation airflow can enter the inside of the electric control box and dissipate the heat generated by the electric control board assembly.

[0009] As an optional embodiment, at least a portion of at least one second heat dissipation hole is arranged toward the air inlet, so that 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.

[0010] As an optional embodiment, the box cover has a guide portion disposed adjacent to the air inlet, and the first heat dissipation hole is provided on the guide portion; a guide surface is formed on the side of the guide portion away from the bottom of the accommodating cavity, and the guide surface extends obliquely toward the air inlet. In this way, the setting of the guide surface can guide the airflow entering the first heat dissipation hole to a certain extent, so that the external airflow can quickly enter the accommodating cavity, and the heat dissipation efficiency of the electric control box is higher.

[0011] As an optional embodiment, there are multiple first heat dissipation holes and multiple second heat dissipation holes, and 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. In this way, by providing multiple first heat dissipation holes and second heat dissipation holes, more heat dissipation airflow enters the electric control box, so that more heat generated by the electric control board assembly can be dissipated, thereby having a better heat dissipation effect on the electric control box, which can improve the performance of the electric control box and the performance of the indoor unit provided by the present application.

[0012] As an optional implementation, in the height direction of the indoor unit, the first heat dissipation area is located in the middle of the air inlet. Since the air flow rate is the largest in the middle of the air inlet, when the first heat dissipation area is located in the middle of the air inlet, more heat dissipation airflow flows into the accommodating cavity through the multiple first heat dissipation holes, so that more heat generated by the electric control board assembly can be dissipated.

[0013] As an optional implementation, in the height direction of the indoor unit, the second heat dissipation area is located within the height range of the air inlet. In this way, when the heat dissipation airflow flows out from the second heat dissipation hole, the airflow can directly flow into the fan cavity through the air inlet, making the flow path of the heat dissipation airflow shorter, thereby making the heat dissipation efficiency of the electric control box higher.

[0014] As an alternative embodiment, in the length direction of the electric control box, the covering lengths of the first heat dissipation area and the second heat dissipation area fall within the same length segment. In this way, the air flow rates through the multiple first heat dissipation holes and the multiple second heat dissipation holes can be made equivalent, enabling the heat dissipation air flow to flow out quickly and improving the heat dissipation efficiency of the electric control box; in addition, it is convenient to open the first heat dissipation holes and the second heat dissipation holes, resulting in fewer processing steps for the electric control box.

[0015] As an alternative embodiment, the indoor unit is installed in an indoor space. The indoor unit in the installed state is defined with a height direction, a length direction, and a width direction; the air inlet includes a first air return port and a second air return port that are connected. The first air return port extends at least along the length direction and the width direction, and the second air return port extends at least along the length direction and the height direction. The second air return port is located between the fan and the electric control box; an installation cavity is formed on the outer side of the housing, and the installation cavity is communicated with the fan cavity through the air inlet, and the electric control box is installed on the installation cavity. In this way, by forming an installation cavity for accommodating the electric control box outside the housing, compared with setting the electric control box inside the housing, the structural compactness of the indoor unit can be improved, making the size of the indoor unit smaller.

[0016] As an alternative embodiment, the installation cavity opens downward. In this way, when the grille on the ceiling is removed, the electric control box can be exposed, facilitating the disassembly and maintenance of the electric control box.

[0017] As an alternative embodiment, the indoor unit is installed on the ceiling of the indoor space. The ceiling has an external air return port, and the external air return port is located below the indoor unit, and at least part of the first air return port overlaps with the external air return port along the height direction. With such a setting, during the operation of the indoor unit, the external air flow can quickly flow through the external air return port and the first air return port into the fan cavity, improving the gas flow efficiency and thus enhancing the performance of the indoor unit.

[0018] As an alternative embodiment, at least part of the installation cavity overlaps with the external air return port along the height direction. That is to say, the external air flow can directly enter the installation cavity through the external air return port to dissipate heat from the electric control box, thereby improving the heat dissipation efficiency of the electric control box.

[0019] As an alternative embodiment, the external air return port is a maintenance port. In this way, when maintaining the electric control box, the grille at the maintenance port is removed and the casing is disassembled to repair the electric control box.

[0020] As an alternative embodiment, the installation cavity has at least a first side wall and an exposure opening. The exposure opening is arranged downward, and the first side wall faces the exposure opening. The electric control box is installed on the first side wall and is exposed below the indoor unit through the exposure opening. In this way, by defining the positions of the first side wall and the exposure opening, the electric control box can be exposed through the exposure opening after removing the grille at the maintenance opening, which facilitates the disassembly and maintenance of the electric control box.

[0021] As an alternative embodiment, 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. Since the flow direction of the air sucked by the fan during rotation extends from top to bottom in the direction from near the second air return opening to far from the second air return opening, the extension direction of the first side wall is consistent with the flow direction of the air. In this way, when the air flows inside the electric control box, the resistance of the air is small, the air flow velocity is fast, and the heat dissipation effect on the electric control box is good.

[0022] As an alternative embodiment, 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. With such a setting, the electric control box can be limited between the second air return opening and the second side wall, which improves the structural compactness of the indoor unit in the width direction on the premise of facilitating the maintenance of the electric control box and having high heat dissipation efficiency.

[0023] As an alternative embodiment, the included angle between the second side wall and the first side wall is greater than 90 degrees. In this way, the opening area at the air inlet of the installation cavity can be made larger, so that more heat dissipation air flow can flow into the installation cavity and then into the electric control box, so that more heat dissipation air flow flows into the electric control box, thereby making the heat dissipation efficiency of the electric control box higher. In addition, such a setting makes the space below the electric control box larger, which is convenient for disassembling and assembling the electric control box.

[0024] As an alternative embodiment, the exposure opening of the installation cavity gradually decreases from bottom to top. In this way, the opening area at the air inlet of the installation cavity can also be made larger, so that more heat dissipation air flow can flow into the installation cavity and then into the electric control box, so that more heat dissipation air flow flows into the electric control box, thereby making the heat dissipation efficiency of the electric control box higher. In addition, such a setting makes the space below the electric control box larger, which is convenient for disassembling and assembling the electric control box.

[0025] As an alternative embodiment, the indoor unit provided in the present application further includes a protective grille. The protective grille is arranged at the air suction port and is connected to the housing. By providing the protective grille, not only can the fan be protected, but also when disassembling and assembling the electric control box, the fan of the fan can be prevented from damaging the construction personnel or users.

[0026] As an alternative embodiment, in the width direction of the indoor unit, the protection grille and the electric control box are spaced apart. In this way, on the one hand, it can to a certain extent avoid the protection grille from blocking the airflow flowing into the first heat dissipation holes, and on the other hand, it can to a certain extent avoid the interference of the setting of the protection grille on the disassembly and assembly of the electric control box. Therefore, such a setting not only facilitates the heat dissipation of the electric control box, but also facilitates the disassembly and assembly of the electric control box.

[0027] As an alternative embodiment, the air suction port includes a first air return port and a second air return port that are connected. The first air return port is arranged to face the external air return port on the ceiling, and the second air return port is located between the blower and the electric control box; the protection grille includes a first grille part and a second grille part that are connected together. The first grille part is arranged at the first air return port, and the second grille part is arranged at the second air return port. In this way, there are protection grilles at both the first air return port and the second air return port, which can protect the blower and the installer or user in two directions.

[0028] As an alternative embodiment, the distance between the second grille part and the electric control box gradually decreases from bottom to top. In this way, on the basis of being able to separate the blower, the air inlet size of the installation cavity is relatively large, so that more airflows flow to the electric control box and then flow into the interior of the electric control box to dissipate the heat generated by the electric control board assembly.

[0029] As an alternative embodiment, the electric control box is detachably connected to the housing. In this way, it is convenient to disassemble and assemble the electric control box, which not only makes the assembly efficiency of the indoor unit provided by this embodiment relatively high, but also can improve the convenience of maintenance of the electric control box during later use.

[0030] As an alternative embodiment, a positioning structure is provided between the electric control box and the housing, and the positioning structure is used to limit the relative position between the electric control box and the housing. In this way, it is convenient to install the electric control box on the housing. During the installation process, first align the electric control box and the housing through the positioning structure, and then connect the electric control box and the housing. While improving the convenience, the connection reliability between the electric control box and the housing is relatively high.

[0031] As an alternative embodiment, 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 electric 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 electric control box. In this way, through the cooperation of the positioning post and the positioning groove, the relative position between the electric control box and the housing can be determined, which is convenient for subsequent connection of the electric control box and the housing.

[0032] 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 with a height direction, a length direction, and a width direction. The indoor unit includes a housing and an electric control box; an air suction port, an air outlet, and an air duct defined between the air suction port and the air outlet are defined inside the housing. The air duct sequentially includes a fan chamber, a diffuser chamber, and a heat exchange chamber along the width direction. At least part of the air suction port 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 a mounting cavity recessed upward, and the mounting cavity is located between the fan chamber and the heat exchange chamber along the width direction. The exposed opening of the mounting cavity faces downward and communicates with the air suction port on the front side; at least part of the electric control box is located in the mounting cavity, and at least part of the electric control box is exposed from the lower opening of the mounting cavity and communicates with the air suction port on the front side. With such a setting, it is not only convenient to disassemble and repair the electric control box, but also beneficial to the heat dissipation of the electric control box, making the indoor unit provided by the present application have better performance.

[0033] As an optional implementation manner, the housing includes a first housing and a second housing. A fan chamber, a diffuser chamber, and a heat exchange chamber are formed between the first housing and the second housing. A fan chamber is formed between the rear side portions of the first housing and the second housing, a diffuser chamber is formed between the middle portions of the first housing and the second housing, and a heat exchange chamber is formed between the front side portions of the first housing and the second housing. The inner side surface of the middle portion of the second housing forms the bottom wall of the diffuser chamber, the outer side surface of the middle portion of the second housing forms the bottom wall of the mounting cavity, and the electric control box is installed on the outer side surface of the middle portion of the second housing. With such a setting, not only can the electric control box be installed outside the housing to improve the heat dissipation performance and maintenance convenience of the electric control box, but also the size of the indoor unit in the width direction is not increased, so that the structural compactness of the indoor unit can be improved to a certain extent.

[0034] As an optional implementation manner, the indoor unit provided by the present application further includes a protection grille, and the protection grille is arranged at the air suction port and connects the upstream ends of the rear side portions of the first housing and the second housing. By providing the protection grille, not only can the fan be protected, but also when disassembling and assembling the electric control box, the fan of the fan can be prevented from causing damage to construction personnel or users.

[0035] As an alternative embodiment, the upstream end of the rear side portion of the first housing is lower than the upstream end of the rear side portion of the second housing. An air suction opening is defined between the upstream end of the rear side portion of the first housing and the upstream end of the rear side portion of the second housing. The air suction opening includes a first air return opening and a second air return opening. The first air return opening is located below the blower chamber and extends along the width direction, and the second air return opening is located in front of the blower chamber and extends along the height direction. In this way, the position of the first air return opening can be adjacent to the inspection opening on the ceiling. During the operation of the blower, the outdoor air flow can quickly enter the blower chamber through the inspection opening and the first air return opening in sequence, resulting in a high air flow efficiency. Moreover, when the second air return opening is located in front of the blower chamber, the heat dissipated by the electronic control box can quickly flow into the blower chamber through the second air return opening, thereby achieving a good heat dissipation effect on the electronic control box.

[0036] As an alternative embodiment, 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 blower chamber, and the duct air outlet interface is defined by the air outlet. In this way, there are positions on the ducted air conditioner for connecting the inlet air duct and the outlet air duct, facilitating the installation of the indoor unit provided in this application.

[0037] As an alternative embodiment, both the duct air inlet interface and the duct air outlet interface are formed by the connecting edges connected to the housing. In this case, the duct air inlet interface can be connected opposite to the pipe orifice of the inlet air duct, and the duct air outlet structure can be connected opposite to the pipe orifice of the outlet air duct, facilitating the connection of the inlet air duct and the outlet air duct to the indoor unit.

[0038] In a third aspect, this application provides a heating, ventilation, and air conditioning (HVAC) device, including the above-mentioned indoor unit.

[0039] In the indoor unit and the HVAC device provided in the embodiments of this application, by arranging the electronic control box outside the housing and making part of the air suction opening located between the blower and the electronic control box, when the blower is operating, the external air flow will be sucked to the electronic control box. After the air flow passes through the electronic control box, it then flows into the blower chamber through the air suction opening. When the external air flow passes through the electronic control box, it can carry the heat generated by the electronic control box and flow into the blower chamber through the air suction opening together, thus realizing the heat dissipation of the electronic control box. Therefore, compared with the solution in the related art of arranging the electronic control box inside the housing, the heat dissipation effect of the electronic control box in the indoor unit provided in the embodiments of this application is better. In addition, when the electronic control box is installed outside the housing, since the electronic control box is exposed outside the housing, it is convenient to inspect or disassemble and repair the electronic control box, thereby improving the performance of the indoor unit and the HVAC device provided in the embodiments of this application. Description of the Drawings

[0040] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1 Schematic three-dimensional structure diagram of the indoor unit provided by the embodiment of the present application;

[0042] Figure 2 Schematic three-dimensional structure diagram of the indoor unit provided by the embodiment of the present application from another perspective;

[0043] Figure 3 Exploded view of the indoor unit provided by the embodiment of the present application;

[0044] Figure 4 Schematic structure diagram of the partial structure of the indoor unit provided by the embodiment of the present application;

[0045] Figure 5 Cross-sectional view of the partial structure of the indoor unit provided by the embodiment of the present application;

[0046] Figure 6 Schematic structure diagram of the electric control box in the indoor unit provided by the embodiment of the present application;

[0047] Figure 7 For Figure 5 Schematic enlarged view of the partial structure at A in

[0048] Figure 8 For Figure 5 Schematic enlarged view of the partial structure at B in

[0049] Figure 9 Schematic connection structure diagram between the second housing and the electric control box in the indoor unit provided by the embodiment of the present application;

[0050] Figure 10 Schematic structure diagram of the positioning structure between the electric control box and the lower housing of the diffuser chamber in the indoor unit provided by the embodiment of the present application.

[0051] Explanation of reference numerals:

[0052] 1. First housing; 2. Second housing; 3. Air duct; 4. Fan; 5. Heat exchanger; 6. Protection grille; 7. Foam board; 8. Sheet metal part;

[0053] 10. Indoor unit; 11. Upper shell of the fan chamber; 12. Upper shell of the diffuser chamber; 13. Upper shell of the heat exchange chamber; 14. Side plate; 21. Water receiving tray; 22. Lower shell of the diffuser chamber; 23. Installation chamber; 31. Air suction port; 32. Fan chamber; 33. Diffuser chamber; 34. Heat exchange chamber; 36. Air outlet; 20. Electric control box; 30. Positioning post; 40. Positioning groove; 61. First grille part; 62. Second grille part;

[0054] 101. Air duct air inlet interface; 102. Air duct air outlet interface; 103. Front connecting edge; 104. Rear connecting edge; 105. Left connecting edge; 106. Right connecting edge; 211. Bottom wall of the tray; 212. Side wall of the tray; 231. First side wall; 232. Second side wall; 233. Exposed opening; 201. Box body; 202. Box cover; 203. Accommodation cavity; 204. Electric control board assembly; 311. First return air inlet; 312. Second return air inlet;

[0055] 2018. Wire passing hole; 2019. Second heat dissipation hole; 2023. First heat dissipation hole; 2024. Flow guiding part; 2025. Flow guiding surface. Detailed implementation manners

[0056] In the related art, the indoor unit includes a casing, a fan, and an electric control box. The heat dissipation of the electric control box includes air cooling and refrigerant heat dissipation, etc. In a related art of electric control box heat dissipation, an air duct is formed inside the casing, and both the fan and the electric control box are arranged in the air duct, so as to perform air cooling on the electric control box; alternatively, in another related art of electric control box heat dissipation, the two sides of the casing along the axial direction of the fan have side plates, and the electric control box is installed on the side plates and exposed outside the casing, and the outside air is used to perform convective heat dissipation on the electric control box, so as to achieve the purpose of temperature reduction. However, during the use of the indoor unit, the electric control box needs to be frequently repaired or inspected. In the former indoor unit above, the electric control box is arranged in the air duct. When repairing the electric control box, the casing needs to be disassembled, which will make the repair complexity of the electric control box relatively high and the repair time relatively long; in the latter indoor unit above, the electric control box is arranged on the side of the casing and exposed outside the casing, and only the outside air is used to perform convective heat dissipation on the electric control box, so that the heat dissipation effect of the electric control box is relatively poor. At the same time, a separate repair port needs to be set for the electric control box, which makes the installation process of the whole indoor unit relatively complex.

[0057] Therefore, the embodiments of the present application provide an indoor unit and a heating, ventilation, and air conditioning (HVAC) device, which make the repair complexity of the electric control box low and the repair efficiency high, and also make the heat dissipation effect of the electric control box better. Moreover, it can improve the simplicity of the installation process of the whole indoor unit, so that the use performance of the HVAC device provided by the embodiments of the present application is better.

[0058] The embodiments of the present application will be introduced in detail below in combination with the drawings and specific implementation manners.

[0059] Please refer toFigures 1 to 3 , Figure 1 is a schematic perspective view of an indoor unit provided by an embodiment of the present application. Figure 2 is a schematic perspective view of the indoor unit provided by the embodiment of the present application from another perspective. Figure 3 is an exploded view of the indoor unit provided by the embodiment of the present application. As Figures 1 to 3 shown, the present embodiment provides an indoor unit 10 for adjusting 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 electric control box 20. The first housing 1 and the second housing 2 form the housing of the indoor unit 10, and the first housing 1 and the second housing 2 cooperate to define an air duct 3. Please continue to refer to Figure 4 , Figure 4 is a schematic structural view of a partial structure of the indoor unit provided by the embodiment of the present application. Combining Figures 1 to 4 , in some embodiments, the air duct 3 includes a suction port 31, a fan chamber 32, a diffuser chamber 33, a heat exchange chamber 34, and an air outlet 36 that are connected in sequence. The fan 4 is disposed in the fan chamber 32, and the fan 4 drives the outside air to enter the fan chamber 32 from the suction port 31. The heat exchanger 5 is disposed in the heat exchange chamber 34.

[0060] Specifically, during the operation of the indoor unit 10, the fan 4 can suck the air flow in the indoor environment. The air flow enters the fan chamber 32 through the suction port 31 in sequence, and after passing through the diffuser chamber 33 and the heat exchange chamber 34, it flows out from the air outlet 36. The air flow exchanges heat with the heat exchanger 5 in the heat exchange chamber 34, and finally discharges the air flow with the changed temperature into the indoor environment.

[0061] In order to solve the problems of high maintenance complexity and poor heat dissipation effect of the electric control box 20 in the related art, in the present embodiment, the electric control box 20 is disposed outside the housing, and part of the suction port 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, after removing the grille at the maintenance port, the electric control box 20 will be exposed, which is convenient for overhauling or disassembling and repairing the electric control box 20; moreover, when the fan 4 is running, the external air flow will be sucked to the electric control box 20, and the air flow will flow into the fan chamber 32 through the suction port 31 after flowing through the electric control box 20. When the external air flow flows through the electric control box 20, it can carry the heat generated by the electric control box 20 and flow into the fan chamber 32 through the suction port 31, thereby realizing the heat dissipation of the electric control box 20 and making the service performance of the electric control box 20 better.

[0062] It should be noted that, in some embodiments, the above-mentioned first housing 1 may be connected above the second housing 2. Since an external air return opening is usually provided on the ceiling below the second housing 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 may be arranged below the second housing 2. In this way, the air flow entering through the external air return opening can directly flow to the electric control box 20.

[0063] Among them, the external air return opening is formed as an access opening of the indoor unit 10. It can be understood that a grille can be provided at the access opening. When performing maintenance or disassembly and repair on the electric control box 20, the grille at the access opening needs to be removed, and then the electric control box 20 can be maintained or disassembled and repaired.

[0064] Furthermore, during the operation of the indoor unit 10, the external air flow needs to flow into the fan cavity 32. Therefore, the air suction opening 31 includes a connected first air return opening 311 and a second air return opening 312. The first air return opening 311 is arranged facing the external air return opening, and the second air return opening 312 is located between the fan 4 and the electric control box 20. In this way, during the operation of the motor 4, not only can the external air flow be sucked into the fan cavity 32 through the first air return opening 311, but also the air flow after dissipating heat from the electric control box 20 can be sucked into the fan cavity 32 through the second air return opening 312, effectively dissipating heat from the electric control box 20 while enabling the normal operation of the indoor unit 10.

[0065] In this embodiment, in order to shorten the flow path of the air flow and reduce the setting of pipelines, the first air return opening 311 faces the lower part of the indoor unit 10; when the first air return opening 311 faces the lower part of the indoor unit 10, the second air return opening 312 can be located in front of the air return opening 311 or behind the first air return opening 311. Here, no specific restrictions are made on the positional relationship between the first air return opening 311 and the second air return opening 312.

[0066] When the indoor unit provided in this embodiment is installed in an indoor space, its height direction, length direction, and width direction are naturally formed. Among them, the height direction of the indoor unit is consistent with Figure 1 the z-z axis direction in Figure 1 ; the length direction of the indoor unit is consistent with Figure 1 the x-x axis direction in Figure 1 ; the width direction of the indoor unit is consistent with Figure 1 the y-y axis direction in Figure 1 . And the above-mentioned up and down direction is consistent with Figure 1 the z-z axis direction in Figure 1 , Figure 2 and Figure 4 ; and along Figure 1 the direction of Figure 1 , Figure 1 the upper part of Figure 1 is the up, Figure 2 and Figure 4 the lower part of Figure 1 is the down; the above-mentioned front and back direction is consistent with Figure 1 , Figure 2 and Figure 4 the front and back direction in

[0067] In this embodiment, the first air return opening 311 extends at least along the length direction and the width direction, and the second air return opening 312 extends at least along the length direction and the height direction; it can be understood that the first air return opening 311 extends in the horizontal plane direction, and the second air return opening 312 extends in the vertical plane direction.

[0068] When the external air return opening is located below the indoor unit 10, at least a part of the first air return opening 311 is overlapped with the external air return opening in the height direction. With such a setting, during the operation of the indoor unit 10, the external air flow can quickly flow through the external air return opening and the first air return opening 311 into the fan cavity 32, improving the gas flow efficiency, and thus improving the performance of the indoor unit 10 provided in this embodiment.

[0069] The following will take the example of the electric control box 20 being installed below the second housing 2 for further introduction.

[0070] Please continue to refer to Figure 5 and Figure 6 , Figure 5 is a cross-sectional view of a partial structure of the indoor unit provided by the embodiment of the present application, Figure 6 is a schematic structural diagram of the electric control box in the indoor unit provided by the 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. Among them, the box body 201 is connected to the second housing 2, the box cover 202 is covered on the side of the box body 201 facing the external air return opening, 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 electric control board assembly 204 should be the main heat-generating part in the electric control box 20. In order to dissipate the heat generated by the electric control board assembly 204, it is necessary to enable the external air flow to flow into the receiving cavity 203 and then flow out of the receiving cavity 203 into the fan cavity 32. Thus, a heat dissipation channel can be formed in the electric control box 20, and the air inlet end of the heat dissipation channel is communicated with the outside, and the air outlet end of the heat dissipation channel is communicated with the fan cavity 32 through the air suction opening 31, that is, the air outlet end of the heat dissipation channel is closer to the air suction opening 31 than the air inlet end of the heat dissipation channel. In this way, the fan 4 can suck the external air flow into the receiving cavity 203 and carry the heat released by the electric control board assembly 204 into the fan cavity 32 together.

[0071] Since the electric control board assembly 204 needs to be electrically connected to other modules inside the indoor unit, through holes 2018 can be opened on the side wall of the box body 201 to supply the wire harness of the electric control board assembly 204 to pass through and be electrically connected to other modules.

[0072] Please continue to refer to Figure 7 and Figure 8 , Figure 7 is Figure 5A magnified schematic diagram of the local structure at point A in the middle. Figure 8 for Figure 5 The enlarged schematic diagram of the local structure at B in the figure. In order to form the above-mentioned heat dissipation channel, at least one first heat dissipation hole 2023 penetrating the box cover 202 can be opened on the box cover 202, and the first heat dissipation hole 2023 forms the air inlet end of the heat dissipation channel to connect the accommodating cavity 203 with the outside; and at least one second heat dissipation hole 2019 is opened on the box body 201, and the second heat dissipation hole 2019 forms the air outlet end of the heat dissipation channel. In this way, when the fan 4 is running, the external air flow can flow into the accommodating cavity 203 through the first heat dissipation hole 2023, and then flow out of the accommodating cavity 203 through the second heat dissipation hole 2019 together with the heat dissipated by the electric control board assembly 204, and then flow into the fan cavity 32 through the second return air port 312 to dissipate the heat of the electric control box 20.

[0073] Moreover, at least a portion of at least one second heat dissipation hole 2019 is disposed toward the air inlet 31, that is, at least a portion of at least one second heat dissipation hole 2019 is disposed toward the second air return port 312. This arrangement enables the heat dissipation airflow flowing out of the second heat dissipation hole 2019 to quickly flow to the second air return port 312, and then flow into the fan chamber 32 through the second air return port 312.

[0074] At the air inlet end of the heat dissipation channel, that is, at the location of the first heat dissipation hole 2023, in order to enable the airflow to quickly flow into the accommodating chamber 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 arranged on the guide portion 2024; and a guide surface 2025 is formed on the side of the guide portion 2024 away from the bottom of the accommodating chamber 203, and the guide surface 2025 extends obliquely toward the air inlet 31, specifically, the guide surface 2025 extends obliquely toward the second return air port 312. In this way, when the airflow flows into the first heat dissipation hole 2023, under the guiding effect of the guide surface 2025, the airflow can flow in a preset direction, so as to reduce the resistance of the airflow during the flow process to a certain extent, so that the airflow can flow into the accommodating chamber 203 through the first heat dissipation hole 2023 more quickly, so as to improve the heat dissipation efficiency of the electric control box 20.

[0075] In order to accelerate the flow of air, in some alternative embodiments, both the first heat dissipation holes 2023 and the second heat dissipation holes 2019 can be multiple. 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. Moreover, the multiple first heat dissipation holes 2023 and the multiple second heat dissipation holes 2019 are arranged in rows and columns. Herein, the arrangement in rows and columns can be understood as that the multiple first heat dissipation holes 2023 are in multiple rows in the thickness direction of the electric control box 20 and in multiple columns in the length direction of the electric control box 20. The arrangement mode of the multiple second heat dissipation holes 2019 can be the same as that of the multiple first heat dissipation holes 2023, that is, the multiple second heat dissipation holes 2019 are in multiple rows in the thickness direction of the electric control box 20 and in multiple columns in the length direction of the electric control box 20.

[0076] Through the above settings, not only can the air flow quickly pass through the first heat dissipation holes 2023 and flow into the accommodation cavity 203, and the air flow can quickly flow out of the accommodation cavity 203 through the second heat dissipation holes 2019, but also, since more air flows into the accommodation cavity 203 through the first heat dissipation holes 2023, more heat generated by the electric control board assembly 204 can be carried out of the accommodation cavity 203, so that the heat dissipation effect of the electric control box 20 is better.

[0077] It should be noted that the thickness direction of the above-mentioned electric control box 20 is Figures 2 to 6 consistent with the z-z axis direction in Figure 1 , 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

[0078] the x-x axis direction in

[0079] .

[0078] It can be understood that during the operation of the blower 4, along the height direction of the indoor unit 10, i.e., the up and down direction in the figure, the air volume in the middle of the air suction port 31 is the largest, that is, the air volume in the middle of the second air return port 312 is relatively large. Further, in order to increase the gas flow rate flowing into the accommodation cavity 203 through the first heat dissipation holes 2023, in the height direction of the indoor unit 10, the first heat dissipation area is located in the middle position of the air suction port 31, that is, the first heat dissipation area is located in the middle area of the second air return port 312. In this way, the gas flow rate flowing into the accommodation cavity 203 through the first heat dissipation holes 2023 can be further increased, so that more heat generated by the electric control board assembly 204 can be sucked away.

[0079] Regarding the second heat dissipation area, if the position of the second heat dissipation area is outside the height range where the air inlet 31 is located, when the air flow flows out through the second heat dissipation holes 2019 and flows into the fan chamber 32 through the second air return opening 312, the flow 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 electronic control box 20. Therefore, in some embodiments, in the height direction of the indoor unit 10, the position of the second heat dissipation area is within the height range where the air inlet 31 is located, that is, the position of the second heat dissipation area is within the height range where the second air return opening 312 is located. In this way, when the air flow passes through the second heat dissipation holes 2019, it can directly flow into the second air return opening 312, and then flow into the fan chamber 32, so that the resistance of the air flow during the flow process is small, so that the air flow can flow quickly, and the heat dissipation efficiency of the electronic control box 20 is improved.

[0080] Please refer to Figure 6 , since the first heat dissipation area and the second heat dissipation area both have a certain coverage range in the length direction of the electronic control box 20, therefore, in order to facilitate the setting of the first heat dissipation holes 2023 and the second heat dissipation holes 2019, in the length direction of the electronic control box 20, the coverage lengths of the first heat dissipation area and the second heat dissipation area fall within the same length segment. In this way, not only can the air flow rates through the multiple first heat dissipation holes 2023 and the multiple second heat dissipation holes 2019 be made equivalent, so that the heat dissipation air flow can flow out quickly, and the heat dissipation efficiency of the electronic control box 20 is improved; in addition, it is convenient to open the first heat dissipation holes 2023 and the second heat dissipation holes 2019, so that the processing process of the electronic control box 20 is less, and the appearance of the electronic control box 20 is better.

[0081] It should be noted that the above-mentioned first heat dissipation holes 2023 and second heat dissipation holes 2019 can be either round holes or square holes, etc. Here, the shapes of the first heat dissipation holes 2023 and the second heat dissipation holes 2019 are not specifically limited.

[0082] When the electronic control box 20 is arranged below the second housing 2, in order to avoid increasing the size of the indoor unit 10 in the height direction of the indoor unit 10, an upwardly concave installation cavity 23 can be provided at the bottom of the second housing 2. The installation cavity 23 is communicated with the fan chamber 32 through the air inlet 31. The installation cavity 23 has a first side wall 231, a second side wall 232 and an exposed opening 233 connected together. The exposed opening 233 is arranged downward and the first side wall 231 faces the exposed opening 233. The first side wall 231 extends between the second air return opening 312 and the second side wall 232, and the second side wall 232 faces the second air return opening 312; the electronic control box 20 is installed on the first side wall 231. In this way, the electronic control box 20 can be accommodated in the installation cavity 23 without changing the height of the indoor unit 10, so that the indoor unit 10 provided in this embodiment has strong structural compactness.

[0083] In some alternative embodiments, the installation cavity 23 opens downward. In this way, when the grille on the ceiling is removed, the electric control box 20 can be exposed, facilitating the disassembly and repair of the electric control box 20.

[0084] As described above, the installation cavity 23 is located on the side of the first air return opening 311, and the first air return opening 311 and the external air return opening are overlapped in the height direction. In some alternative embodiments, at least part of the installation cavity 23 is also overlapped with the external air return opening in the height direction. That is to say, the external air flow can directly enter the installation cavity 23 through the external air return opening to dissipate heat from the electric control box 20, thereby improving the heat dissipation efficiency of the electric control box 20.

[0085] In order to form the above-mentioned air suction opening 31, fan cavity 32, diffuser cavity 33, heat exchange cavity 34 and air outlet 36, in some specific embodiments, the first housing 1 includes a fan cavity upper housing 11, a diffuser cavity upper housing 12, a heat exchange cavity upper housing 13 and two side plates 14 of the first housing 1 along the length direction of the indoor unit 10. Among them, the fan cavity upper housing 11, the diffuser cavity upper housing 12 and the heat exchange cavity upper housing 13 are integrally formed into an upper cover, and the two side plates are respectively connected to both sides of the first housing 1 along the length direction of the indoor unit 10. The bottom surface of the fan cavity upper housing 11 defines the top wall of the fan cavity 32, the bottom surface of the diffuser cavity upper housing 12 defines the top wall of the diffuser cavity 33, and the bottom surface of the heat exchange cavity upper housing 13 defines the top wall of the heat exchange cavity 34.

[0086] Please continue to refer to Figure 9 , Figure 9 which is a schematic diagram of the connection structure between the second housing and the electric control box in the indoor unit provided by the embodiment of the present application. Further, the second housing 2 includes a water receiving tray 21 and a diffuser cavity lower housing 22 integrally formed. Among them, the water receiving tray 21 defines the bottom wall of the heat exchange cavity 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 diffuser cavity lower housing 22 and the tray bottom wall 211 to form the above-mentioned second side wall 232. The top surface of the diffuser cavity lower housing 22 defines the bottom wall of the diffuser cavity 33, and the bottom surface of the diffuser cavity lower housing 22 forms the above-mentioned first side wall 231.

[0087] Further, in order to prevent condensed water from adhering to the outside of the water receiving tray 21, a foam board 7 can be provided at the bottom of the water receiving tray 21, and a sheet metal part 8 can be provided at the bottom of the foam board 7 to sandwich the foam board 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 threaded fasteners such as screws, and the foam board 7 and the sheet metal part 8 are jointly installed on the water receiving tray 21.

[0088] Since the electronic control box 20 is installed on the first side wall 231, in order to improve the heat dissipation efficiency of the electronic control box 20, the flow resistance of the air flow in the electronic control box 20 can be reduced. For example, the extending direction of the bottom wall of the accommodating cavity 203 is made to be approximately the same as the flowing direction of the air flow. And since the electronic control box 20 is installed on the first side wall 231, therefore, it is only necessary to make the extending direction of the first side wall 231 approximate to the flowing direction of the air flow. Thus, in some alternative embodiments, the first side wall 231 extends in the height direction, and the first side wall 231 and the second air return opening 312 extend close to each other from bottom to top. In this way, the extending direction of the first side wall 231 is relatively close to the flowing direction of the air flow, which can reduce the flow resistance of the air flow in the accommodating cavity 203, increase the flowing speed of the air flow, and further improve the heat dissipation efficiency of the electronic control box 20.

[0089] Furthermore, in order to facilitate the installation of the electronic control box 20 on the first side wall 231, the wall surface of the first side wall 231 can be set as an inclined wall surface. In this way, not only can the flow resistance of the air flow in the accommodating cavity 203 be small, but also the smoothness of the surface of the first side wall 231 can be improved, which is beneficial to the installation of the electronic control box 20.

[0090] It should be noted that in some embodiments, a detachable connection method can be adopted between the electronic control box 20 and the diffuser chamber lower shell 22. Specifically, a detachable connection is provided between the box body 201 and the diffuser chamber lower shell 22. For example, it is detachably connected through a screwing structure and / or a clamping structure. It can be understood that the electronic control box 20 and the diffuser chamber lower shell 22 can be detachably connected through a screwing structure, or can be detachably connected through a clamping structure, or can also be detachably connected through a combination of a screwing structure and a clamping structure. Here, no specific limitation is imposed on the connection method between the box body 201 of the electronic control box 20 and the diffuser chamber lower shell 22.

[0091] Generally, when the electronic control box 20 is overhauled, the internal electronic control board assembly 204 is overhauled. Therefore, in order to facilitate the overhaul of the electronic control board assembly 204, in this embodiment, a detachable connection method can also be adopted between the box cover 202 and the box body 201. In this way, when the problem of the electronic control board assembly 204 is not serious, the box cover 202 can be simply removed from the box body 201, and the electronic control board assembly 204 can be overhauled.

[0092] Please continue to refer to Figure 10 , Figure 10This is a schematic structural diagram of the positioning structure between the electronic control box and the diffuser chamber lower housing in the indoor unit provided by the embodiment of the present application. In order to improve the installation efficiency between the electronic control box 20 and the second housing 2, a positioning structure can be provided between the electronic control box 20 and the first side wall 231. The positioning structure is used to limit the relative position between the electronic control box 20 and the diffuser chamber lower housing 22. In this way, when installing the electronic control box 20 and the diffuser chamber lower housing 22, the positions between the electronic control box 20 and the diffuser chamber lower housing 22 can be determined first, and then the electronic control box 20 and the diffuser chamber lower housing 22 can be connected together through the above-mentioned screwing structure and clamping structure.

[0093] In some alternative embodiments, the positioning structure includes a positioning post 30 and a positioning groove 40, and the positioning post 30 is inserted into the positioning groove 40. One of the positioning post 30 and the positioning groove 40 is provided on the side of the box body 201 of the electronic control box 20 facing the second housing 2, and the other of the positioning post and the positioning groove is provided on the side of the diffuser chamber lower housing 22 facing the box body 201. In the specific embodiment of this embodiment, the axial direction of the positioning post 30 is consistent with the thickness direction of the electronic control box 20, and the depth direction of the positioning groove 40 is also consistent with the depth direction of the electronic 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 housing 22. In this way, when installing the electronic control box 20 on the diffuser chamber lower housing 22, the positioning post 30 and the positioning groove 40 can be aligned first, and then the electronic control box 20 and the diffuser chamber lower housing 22 can be connected together through the above-mentioned screwing structure and / or clamping structure.

[0094] In order to further improve the installation efficiency of the electronic control box 20, a plurality of positioning posts 30 and a plurality of positioning grooves 40 corresponding to the plurality of positioning posts 30 can be provided. Here, the number of the positioning posts 30 and the number of the positioning grooves 40 are not limited.

[0095] In some embodiments, in order to allow more air flow to enter the air inlet side of the installation cavity 23, the angle between the first side wall 231 and the second side wall 232 can be limited so that the opening of the air inlet side of the installation cavity 23 is larger. Therefore, the angle between the second side wall 232 and the first side wall 231 can be greater than 90 degrees. In this way, the opening of the air inlet side of the installation cavity 23 is larger, ensuring that more air flow enters the electronic control box 20, and enabling more heat generated by the electronic control board assembly 204 to be carried out of the accommodation cavity 203.

[0096] In some other embodiments, the air flow rate flowing into the electric control box 20 can also be ensured by restricting the opening size of the installation cavity 23. Specifically, the opening of the installation cavity 23 gradually decreases from bottom to top. That is to say, the opening at the lower part of the installation cavity 23 is larger, and the opening at the lower part of the installation cavity 23 is just the air inlet side of the installation cavity 23. Therefore, by restricting the opening size of the installation cavity 23, the air flow rate at the air inlet side of the installation cavity 23 can also be made larger, so as to achieve a better heat dissipation effect for the electric control box 20.

[0097] Please refer to Figure 2 and Figure 4 As shown, in some embodiments, in order to avoid damage to people caused by the fan 4 and to protect the fan 4 at the same time, a protective grille 6 can be provided at the air suction port 31. One side of the protective grille 6 is connected to the upper shell 11 of the fan cavity, and the other side of the protective grille 6 is connected to the lower shell 22 of the diffuser cavity. In this way, by providing a grille at the air suction port 31, when installing or disassembling the electric control box 20, it can avoid damage to people caused by the fan 4 to a certain extent, and at the same time can protect the fan 4, so that the fan 4 maintains good performance. Moreover, it can avoid larger insects or foreign objects from entering the fan cavity 32 through the air suction port 31 to a certain extent.

[0098] When the protective grille 6 is provided, the air intake of the installation cavity 23 may be affected due to the presence of the protective grille 6. Therefore, in order to avoid this phenomenon, the protective grille 6 and the electric control box 20 are spaced apart in the width direction of the indoor unit 10. In this way, even if the protective grille 6 is provided, the air flow rate entering the installation cavity 23 will not be affected greatly, ensuring the heat dissipation effect of the electric control box 20; at the same time, it can also avoid interference of the protective grille 6 with the installation or disassembly of the electric control box 20 to a certain extent.

[0099] Specifically, in order to protect both the first air return port 311 and the second air return port 312, the above-mentioned protective grille 6 can include a first grille part 61 and a second grille part 62 connected together. The first grille part 61 is arranged at the first air return port 311, and the second grille part 62 is arranged at the second air return port 312. In this way, the entire air suction port 31 can be protected and blocked by the protective grille 6, improving the protection effect of the protective grille 6 on the fan 4.

[0100] Similarly, to ensure the air intake volume on the air inlet side of the installation cavity 23, the distance between the second grille portion 6 and the electronic control box 20 can be restricted. For example, in the width direction of the indoor unit 10, the distance between the second grille portion 6 and the electronic control box 20 gradually decreases from bottom to top. That is, on the air inlet side of the installation cavity 23, the distance between the electronic control box 20 and the second grille portion 6 is the largest. In this way, the air flow rate on the air inlet side of the installation cavity 23 is relatively large, which can further avoid, to a certain extent, the influence of the installation of the protective grille 6 on the heat dissipation of the electronic control box 20.

[0101] Furthermore, the indoor unit 10 provided in this embodiment can be a duct machine. The duct machine has a duct air inlet interface 101 and a duct air outlet interface 102. The duct air inlet interface 101 is defined between the rear side of the heat exchange cavity 34 and the rear side of the fan cavity 32. That is to say, the air inlet 31 and the installation cavity 23 fall within the width range of the duct air outlet interface 102.

[0102] For the duct air inlet interface 101, in some specific embodiments, a connecting edge extends vertically downward at the rear side of the sheet metal part, and this connecting edge forms the front connecting edge 103 of the duct air inlet interface 101. A connecting edge extends vertically downward at the rear side part of the first housing 1 (i.e., the rear side housing of the fan cavity 32), and it is defined as the rear connecting edge 104 of the duct air inlet interface 101. The air inlet duct (not shown in the figure) is fixedly connected to the front connecting edge 103 and the rear connecting edge 104 respectively. Further, the two sides of the duct air inlet interface 101 respectively have a left connecting edge 105 and a right connecting edge 106. The left connecting edge 105 and the right connecting edge 106 connect the front connecting edge 103 and the rear connecting edge 104 front and back. In some embodiments, the front connecting edge 103, the rear connecting edge 104, the left connecting edge 105, and the right connecting edge 106 are connected end to end to form a rectangular structure, and the air inlet duct is fixedly connected to this rectangular interface.

[0103] For the duct air outlet interface 102, in some specific embodiments, a plurality of connecting edges can be provided to protrude from the edge of the air outlet 36, and the air outlet duct (not shown in the figure) is fixedly connected to the plurality of connecting edges.

[0104] This embodiment also provides a heating, ventilation, and air conditioning (HVAC) device, including the indoor unit 10 in the above embodiment. It should be noted that the indoor unit 10 has been introduced in detail in the above embodiments, and will not be elaborated here. The HVAC device provided in this embodiment should also include an outdoor unit, and the structure of the outdoor unit is not specifically limited here.

Claims

1. An indoor unit for adjusting the air in an indoor space, characterized in that, 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 inlet. The blower is disposed within the blower chamber, and the blower drives outside air to enter the blower chamber from the air inlet. The electric control box is installed outside the housing, and part of the air inlet 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 inlet than the air inlet end of the heat dissipation channel.

3. The indoor unit according to claim 2, characterized in that, 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, at least part of at least one of the second heat dissipation holes is arranged facing the air inlet.

5. The indoor unit according to claim 3, characterized in that, The box cover has a guiding portion arranged adjacent to the air inlet, 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 towards the air inlet.

6. The indoor unit according to claim 3, characterized in that, 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, characterized in that, In the height direction of the indoor unit, the first heat dissipation area is located at the middle position of the air inlet; 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 inlet is located.

8. The indoor unit according to claim 7, characterized in that 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, characterized in that, 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 inlet 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 communicates with the blower chamber through the air inlet, and the electric control box is installed in the installation cavity.

10. The indoor unit according to claim 9, characterized in that The installation cavity opens downward.

11. The indoor unit according to claim 9, characterized in that, 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, characterized in that, 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, characterized in that, The external air return opening is the maintenance opening of the indoor unit.

14. The indoor unit according to claim 9, characterized in that, The installation cavity has at least a first side wall and an exposed opening. The exposed opening is arranged downward, and the first side wall faces the exposed opening. The electric 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, characterized in that, 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, characterized in that, 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, characterized in that, The exposed opening gradually decreases from bottom to top.

19. The indoor unit according to claim 1, characterized in that, 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, characterized in that, In the width direction of the indoor unit, the protective grille and the electric control box are arranged at intervals.

21. The indoor unit according to claim 19, characterized in that, 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 electric control box; The protective grille includes a first grille part and a second grille part that are 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, characterized in that, The distance between the second grille part and the electric control box gradually decreases from bottom to top.

23. The indoor unit according to any one of claims 1 to 22, characterized in that, The electric control box is detachably connected to the housing.

24. The indoor unit according to claim 23, characterized in that, A positioning structure is provided between the electric control box and the housing, and the positioning structure is used to limit the relative position between the electric 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 electric 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 electric control box.

26. An indoor unit is installed on the ceiling of an indoor space, characterized in that, The indoor unit installed on the ceiling is defined with a height direction, a length direction and a width direction. 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. The exposed opening of the installation cavity faces downward and is communicated with the air suction opening at the front side; An electric control box, at least part of the electric control box is located in the installation cavity, and at least part of the electric 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, characterized in that, 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. 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, the outer side surface of the middle part of the second housing forms the bottom wall of the installation chamber, and 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, characterized in that, It further includes a protective grille, which is arranged at the air inlet and connects 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.

29. The indoor unit according to claim 28, characterized in that, 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 below the blower chamber and extends along the width direction, and the second air return opening is located in front of the blower chamber and extends along the height direction.

30. The indoor unit according to any one of claims 26 to 29, characterized in that, 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 blower chamber, and the duct air outlet interface is defined by the air outlet.

31. The indoor unit according to claim 30, characterized in that, 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 (HVAC) device, characterized in that, 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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