Air return box, air conditioner indoor unit and air conditioner system

Abstract

The utility model discloses an air return box, an air conditioner indoor unit and an air conditioning system, and relates to the technical field of air conditioning equipment, the air return box comprises a case main body and a fan assembly, the rear side of the case main body is configured to be allowed to be installed on a supporting main body, and a hollow air return cavity is formed in the case main body; an air return opening communicated with the air return cavity is formed in the upper side or the lower side of the case body, a receding opening connected with the air return opening is formed in the rear side of the case body, and the fan assembly is arranged in the air return cavity. According to the air return box, the receding opening is formed in the rear side of the case body, so that a wider operation space is provided for maintenance personnel, an operator can easily complete related operation without disassembling the rear panel when the related operation such as overhaul maintenance and part replacement is carried out on the air return box, the maintenance difficulty caused by the fact that the rear panel cannot be disassembled is avoided, and the maintenance efficiency is improved. Therefore, the operation process is greatly simplified, and the difficulty of related operation is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of air conditioning equipment, and in particular to a return air box, an indoor air conditioning unit, and an air conditioning system. Background Technology

[0002] As an indispensable terminal device in a central air conditioning system, the core function of a fan coil unit is to cool or heat indoor air by exchanging heat between circulating air and refrigerant or heat medium, thereby maintaining the comfort of the indoor environment. In the overall structure of the fan coil unit, the return air box is responsible for effectively guiding indoor air to the coil area for heat exchange treatment, and then returning the treated air to the room, forming a complete air circulation system.

[0003] Currently, return air boxes generally adopt a fully enclosed structure. While this structure protects internal components from external environmental interference to some extent, it also brings some significant problems. Especially when performing maintenance or even replacing internal components inside the return air box, the fully enclosed design often results in the rear panel being tightly fitted to the wall or other structure, leaving extremely limited operating space for the operator. Operators often need to remove the rear panel to access the equipment, a process that is not only cumbersome and complex, but may also require special tools or destructive methods, increasing maintenance costs and time, and potentially damaging the overall structure of the return air box. Even more seriously, in extreme cases where space constraints prevent the rear panel from being removed, operators may have to abandon the replacement of faulty components, severely impacting the normal operation of the air conditioning system and the comfort of the indoor environment. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a return air box, an indoor air conditioning unit, and an air conditioning system, which can solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Firstly, a return air box is provided, comprising:

[0007] The chassis body has a rear side configured to allow installation on a support body. A hollow return air cavity is formed inside the chassis body. A return air inlet communicating with the return air cavity is opened on the upper or lower side of the chassis body. A clearance opening connected to the return air inlet is opened on the rear side of the chassis body.

[0008] A fan assembly is disposed in the return air chamber.

[0009] As an optional implementation, the return air vent extends along the width direction of the main body of the chassis.

[0010] As an optional implementation, the dimension of the clearance opening along the width direction of the chassis body is the same as that of the return air vent.

[0011] As an optional implementation, the fan assembly is disposed at one end of the return air cavity near the return air inlet and the clearance opening, and the fan assembly is at least partially exposed to the outside of the main body of the chassis through the return air inlet and the clearance opening;

[0012] The wind turbine assembly includes:

[0013] Electric motor; and

[0014] The impeller is connected to the motor drive.

[0015] As an optional implementation, the motor is provided with synchronously rotating output shafts at opposite ends;

[0016] The impeller is configured as two, and the two impellers are coaxially connected to the two output shafts of the motor, and the two impellers are spaced apart in the return air cavity along the width direction of the main body of the casing.

[0017] As an optional implementation, the chassis body includes:

[0018] A first housing provides installation space for the fan assembly, and the first housing has the return air inlet and the clearance opening; and

[0019] The second housing is installed at the end of the first housing away from the return air inlet and the clearance opening. The interior of the second housing is connected to the interior of the first housing to form the return air cavity. The end of the second housing away from the first housing has an air outlet that communicates with the return air cavity. The interior of the second housing is used to provide installation space for the coil assembly.

[0020] As an optional implementation, the top of the first box is provided with a top plate, and a first edge is formed at the end of the top plate away from the second box;

[0021] The top plate is provided with side plates on opposite sides in its width direction, and the side plate away from the second box body has a second plate edge that slopes downward from top to bottom in the direction away from the second box body and towards the second box body;

[0022] The bottoms of the two side panels are connected by a base plate, and a third edge is formed on the side of the base plate away from the second housing.

[0023] The first plate edge, the second plate edge, and the third plate edge are connected to form the return air inlet and the clearance opening.

[0024] As an optional implementation, the top plate is further provided with a downwardly folding mounting plate at the end away from the second housing, and the end of the mounting plate away from the first housing forms the first plate edge.

[0025] In a second aspect, an indoor air conditioning unit is provided, including a return air box as described in the first aspect.

[0026] Thirdly, an air conditioning system is provided, including an indoor air conditioning unit as described in the second aspect.

[0027] The beneficial effects of this utility model are as follows: By opening a clearance at the rear of the main body of the return air box, the design of the rear panel is eliminated, providing maintenance personnel with a more spacious operating space. This effectively solves the space limitation problem faced by fully enclosed return air boxes during related operations, allowing operators to easily complete related operations such as inspection, maintenance, and component replacement without disassembling the rear panel. This avoids maintenance difficulties caused by the inability to disassemble the rear panel, thereby greatly simplifying the operation process and reducing the difficulty of related operations.

[0028] By strategically arranging the return air vents and clearance openings, they together create a larger airflow path. This helps reduce air resistance and turbulence during airflow, improving airflow efficiency and accelerating indoor temperature regulation, thereby enhancing the overall energy efficiency of the air conditioning system. Simultaneously, the presence of the clearance openings allows the rear of the return air box to be semi-open, creating a larger return air space between it and the supporting structure. This increased space facilitates smoother airflow, reducing turbulence and turbulence generated in confined spaces, effectively minimizing noise during airflow, improving auditory perception, and enhancing the user experience. Attached Figure Description

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is one of the isometric views of the return air box described in the embodiments of this utility model;

[0031] Figure 2 This is the second isometric view of the return air box described in this embodiment of the utility model;

[0032] Figure 3 This is a side view of the return air box according to an embodiment of the present utility model;

[0033] Figure 4 This is a bottom view of the return air box according to an embodiment of the present utility model.

[0034] In the diagram: 10. Main body of the chassis; 11. First chassis; 111. Return air vent; 112. Clearance opening; 113. Top plate; 1131. Mounting plate; 1132. First plate edge; 114. Side plate; 1141. Second plate edge; 115. Bottom plate; 1151. Third plate edge; 116. Back plate; 12. Second chassis; 121. Air outlet; 13. Fan assembly; 131. Motor; 1311. Output shaft; 132. Impeller; 14. Coil assembly; 20. Support body. Detailed Implementation

[0035] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model are further described in detail below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Fan coil units, as indispensable terminal equipment in central air conditioning systems, have a wide range of applications, covering large public buildings such as office buildings, hotels, and shopping malls, as well as residential homes. Their core function is to cool or heat indoor air through heat exchange between circulating air and refrigerant or heat transfer medium, thereby maintaining indoor environmental comfort. In the overall structure of the fan coil unit, the return air box plays a crucial role. It is responsible for effectively guiding indoor air to the coil area for heat exchange and then returning the treated air to the room, forming a complete air circulation system. This design not only ensures continuous circulation and renewal of indoor air but also effectively improves the overall energy efficiency of the air conditioning system.

[0039] However, traditional return air box designs typically employ a fully enclosed structure, with only return and outlet vents. While this structure offers some protection to internal components from external environmental interference, it also introduces several significant problems. Particularly during maintenance and repairs, or even component replacement, the fully enclosed design often results in the rear panel being tightly fitted to the wall or other structure, severely limiting the operator's space. Operators often need to remove the rear panel to access the equipment, a cumbersome and complex process that may require special tools or even destructive methods, increasing maintenance costs and time, and potentially damaging the overall structure of the return air box. Even more seriously, in extreme cases where space constraints prevent rear panel removal, operators may be forced to abandon replacement efforts, severely impacting the normal operation of the air conditioning system and indoor comfort.

[0040] In addition, traditional return air boxes are limited by the structure of the return air inlet, which causes eddies and resistance to be generated during air flow. This reduces air circulation efficiency and may also lead to excessive noise, affecting user comfort.

[0041] In view of this, this embodiment provides a return air box, which is mainly used in air conditioning equipment to guide indoor air to the coil for heat exchange. This return air box provides sufficient operating space for the operator by opening a clearance opening on the rear side of the main unit. Furthermore, the combination of the clearance opening and the return air inlet provides a larger airflow path for the main unit, thus solving a series of technical problems such as limited operating space and excessive noise associated with return air boxes.

[0042] Please refer to the instruction manual attached. Figures 1-4The return air box includes a main body 10, the rear of which is configured to allow installation on a supporting body 20 (such as a wall, bracket, etc.). The main body 10 serves as the supporting body 20 for the return air box, and has a hollow return air cavity (not shown) inside. The return air cavity is the core area for air circulation, and it should be designed to ensure smooth airflow within it, reduce eddies and resistance, and improve air circulation efficiency.

[0043] Based on this, a return air inlet 111 is provided on the upper or lower side of the main body 10 of the chassis. The return air inlet 111 is the main channel for air to enter the return air box. Setting the return air inlet 111 on the upper or lower side of the return air box can ensure that the air outside the return air box can smoothly enter the return air cavity and ensure that the air can flow smoothly through the return air cavity, so that indoor air circulation and heat exchange can be realized in actual application scenarios.

[0044] It should be understood that in actual application scenarios, the main body of the chassis 10 is also provided with an air outlet 121 connected to the return air cavity. The main function of the air outlet 121 is to supply air. It is generally located at the end of the main body of the chassis 10 away from the return air outlet 111. When the air conditioning system or ventilation equipment is started, the treated air will be transported to the air outlet 121 through the return air cavity and blown evenly to all corners of the room by the air outlet 121, so that the indoor temperature, humidity and air quality can be regulated and improved.

[0045] Meanwhile, a clearance opening 112 connected to the return air vent 111 is also provided on the rear side of the chassis body 10. The clearance opening 112 is located on one side of the chassis body 10 for installation on the support body 20. In actual application scenarios (when the chassis body 10 is installed on the support body 20), the function provided by the rear panel originally located on the rear side of the chassis body 10 (to cooperate with the chassis body 10 to enclose the return air cavity) is undertaken by the support body 20. By utilizing the support body 20 (such as the sealing of a wall) as part of the return air cavity, the design of the clearance opening 112 actually incorporates the support body 20 into the sealed system of the return air cavity. In this way, even without the rear panel, the return air cavity can maintain good airtightness, ensuring the efficiency and quality of air circulation.

[0046] By adopting the above design, the presence of the recess 112 provides convenience for operators when inspecting, maintaining, or even replacing components inside the return air box. It provides maintenance personnel with a more spacious operating space and effectively solves the space limitation problem faced by the fully enclosed return air box during related operations. Operators can easily perform related operations inside the return air cavity through the space provided by the recess 112 and the return air inlet 111 without disassembling complex panels or structural components. This avoids the maintenance difficulties caused by the inability to disassemble the rear panel, thereby greatly simplifying the operation process, saving maintenance time, and reducing the difficulty of operation.

[0047] It is worth mentioning that the design of connecting the clearance opening 112 to the return air vent 111 provides operators with a wider field of vision during inspection and maintenance. Compared to a design that separates the clearance opening 112 and the return air vent 111, this implementation not only helps operators quickly locate the operating position but also improves the accuracy and efficiency of related operations. Furthermore, the larger operating space allows operators to enter the return air cavity in various postures and angles, and even with more different types of tools, enabling them to more flexibly handle various complex operating scenarios and improving the comfort and safety of related operations.

[0048] The return air box in this embodiment also includes a fan assembly 13, which is specifically disposed in the return air cavity. The fan assembly 13 drives the fan blades to rotate through the internal drive device, thereby generating airflow and creating negative pressure in the return air cavity, which draws indoor air into the return air cavity through the return air inlet 111 and is discharged from the air outlet 121 under the action of the fan assembly 13. This process realizes the circulation and heat exchange of indoor air.

[0049] In the above embodiment, because the main body 10 of the chassis has a connected return air inlet 111 and a recess 112, the rear side of the return air box has a semi-open structure. In specific application scenarios, even if the supporting body 20 is still present at the rear of the main body 10 of the chassis, the cooperation of the return air inlet 111 and the recess 112 can create a larger return air space between the fan assembly 13 and the supporting body 20. This return air space helps the airflow to flow more smoothly into the return air cavity through the return air inlet 111 and the recess 112, reducing the turbulence and eddies generated in the original narrow return air channel, improving air circulation efficiency, and achieving the purpose of accelerating the indoor temperature regulation speed and improving the overall energy efficiency of the air conditioning system. At the same time, this also means that the airflow will not be excessively obstructed or compressed when passing through the return air box. Furthermore, the impact angle and force between the airflow and the support body 20 and the box wall of the chassis body 10 will change accordingly when the airflow passes through the return air cavity. In some cases, this change helps to reduce the noise generated by the airflow impact, thereby reducing the noise generated during the operation of the return air box, effectively improving the hearing during use, and enhancing the user experience.

[0050] To facilitate a more comprehensive understanding of this embodiment, the airflow direction of the chassis body 10 is defined below as its length direction. Please refer to the appendix of the instruction manual. Figure 4 Based on this, the return air vent 111 and the air outlet 121 are provided. The return air vent 111 extends along the width direction of the main body 10 of the chassis.

[0051] In a further embodiment, the width of the air inlet on the main body 10 is substantially the same as the width of the main body 10, thereby maximizing the area of ​​the return air inlet 111. This allows it to more effectively capture airflow from all directions within the room, increasing the return air volume and improving the overall air circulation efficiency of the air conditioning system. Simultaneously, the return air inlet 111, extending along the width of the main body 10, can also capture a wider range of indoor air, enabling more even entry of indoor air into the return air cavity and reducing turbulence and eddies within the main body 10, ensuring smoother and more efficient indoor air circulation.

[0052] Furthermore, the dimensions of the clearance opening 112 along the width direction of the main body 10 of the casing are consistent with those of the return air vent 111. The clearance opening 112 and the return air vent 111 are of the same width when connected. This means that when operators perform relevant operations inside the main body 10 of the casing through the clearance opening 112, they can further utilize the return air vent 111 to obtain a larger operating field of view and space. This helps operators to more easily access the fan assembly 13 and other key components to carry out necessary inspection, maintenance and replacement work, thereby saving maintenance time, reducing maintenance costs and improving the operating efficiency of the entire air conditioning system.

[0053] In addition, the design that the clearance opening 112 and the return air opening 111 are the same width can reduce the processing difficulty of the chassis body 10. During the process of forming the chassis body 10 using different processing techniques, the return air opening 111 and the clearance opening 112, which are connected on the chassis body 10 and are the same width, can be processed and formed in the same process. The two openings can be processed using the same or similar tools and molds, which not only simplifies the production process, but also reduces manufacturing costs, improves production efficiency, and helps to improve the processing accuracy of the chassis body 10.

[0054] In one embodiment, please continue to refer to the appendix to the specification. Figures 1-4 With a return air inlet 111 and a clearance opening 112 provided on the main body 10 of the chassis, the fan assembly 13 is located at one end of the return air cavity near the return air inlet 111 and the clearance opening 112. The fan assembly 13 is at least partially exposed outside the main body 10 of the chassis through the return air inlet 111 and the clearance opening 112, which makes it easier for operators to approach the fan assembly 13 to perform necessary maintenance, cleaning or replacement work, effectively improving the operating efficiency of the operators.

[0055] It is worth mentioning that the above design can reduce the difficulty of the operation when the operator only needs to operate the fan assembly 13. When the operation requires disassembling the fan assembly 13, it can also help reduce the damage or error that may occur during disassembly and reinstallation, thereby enhancing the reliability and service life of the system.

[0056] In addition, exposing the fan assembly 13 part to the outside of the main body 10 through the return air vent 111 and the clearance vent 112 helps the fan assembly 13 to act on the air outside the main body 10 (indoor air), thereby increasing the air circulation efficiency of the air conditioning system.

[0057] In one specific implementation, the fan assembly 13 includes a motor 131 and an impeller 132. The fixed end of the motor 131 (such as the housing and the stator installed inside the housing) is fixedly mounted to the main body 10 of the casing, while the impeller 132 is drivenly connected to the output end (mover, which can also be regarded as the output shaft 1311) of the motor 131. In specific application scenarios, the impeller 132 is at least partially exposed outside the main body 10 of the casing from the return air inlet 111 and the clearance opening 112, to ensure that the impeller 132 can efficiently draw in indoor air and optimize airflow distribution when driven by the motor 131.

[0058] Please continue to refer to the instruction manual appendix. Figure 2 , Figure 4 As an optional embodiment of the above solution, the motor 131 is provided with synchronously rotating output shafts 1311 at opposite ends. Correspondingly, two impellers 132 are also provided, and the two impellers 132 are coaxially connected to the output shafts 1311 at both ends of the motor 131. The output shafts 1311 at opposite ends of the motor 131 are configured to rotate synchronously, thereby ensuring that the two impellers 132 can rotate simultaneously and at the same speed, which helps to balance the airflow and improve the stability and efficiency of the system.

[0059] Furthermore, the two impellers 132 are spaced apart in the return air cavity along the width direction of the main body 10 of the casing. Based on the aforementioned return air inlet 111 extending along the width direction of the main body 10 of the casing, their arrangement matches the opening direction of the return air inlet 111 and the opening direction of the clearance opening 112. This can further expand the influence of the fan assembly 13 on the indoor air, so as to maximize the conversion efficiency of wind energy. This allows the impellers 132 to more effectively draw in and exhaust indoor air during rotation, thereby further optimizing the airflow distribution in the room and the return air cavity and improving the efficiency of air circulation.

[0060] In addition to achieving the aforementioned technical effects of improving ventilation efficiency and enhancing wind power output, the arrangement of the two impellers 132 at intervals along the width of the main body 10 of the casing also allows the two impellers 132 to be directly operated by the operator when the arrangement of the impellers 132 matches the opening direction of the return air inlet 111 and the clearance outlet 112. This makes it easier for the operator to perform relevant operations on the fan assembly 13, enabling the operator to complete the inspection and maintenance tasks more quickly and improving operational efficiency.

[0061] In one alternative implementation, the chassis body 10 adopts a modular design concept, such as... Figures 1-4 As shown, the main body 10 of the chassis includes a first housing 11 and a second housing 12. The first housing 11 provides installation space for the fan assembly 13 and has a return air inlet 111 and a clearance opening 112. The second housing 12 is installed at the end of the first housing 11 away from the return air inlet 111 and the clearance opening 112. The interior of the second housing 12 is connected to the interior of the first housing 11 to form a return air cavity. The end of the second housing 12 away from the first housing 11 has an air outlet 121 that communicates with the return air cavity. The interior of the second housing 12 provides installation space for the coil assembly 14.

[0062] It's important to clarify that the aforementioned coil assembly 14 is the core component of the air conditioning unit. It transfers the cooling (heating) capacity of the refrigerant (or heating medium) to the air passing through it. Heat exchange occurs between the refrigerant (or heating medium) inside the coil assembly 14 and the air outside, thus regulating the indoor temperature. Generally, the coil assembly 14 mainly consists of copper tubes and aluminum foil. The copper tubes provide the flow space for the refrigerant (or heating medium). Aluminum foil is placed on top of the coiled copper tubes to increase the heat exchange area between the refrigerant (or heating medium) and the external environment, thereby improving heat exchange efficiency.

[0063] In the above embodiments, the main body 10 of the chassis adopts a modular design concept. In certain special maintenance scenarios, operators can disassemble the first chassis 11 and the second chassis 12 to further reduce the difficulty of equipment maintenance and improve maintenance efficiency. Furthermore, when a chassis malfunctions, the first chassis 11 and the second chassis 12 can be replaced and upgraded independently, significantly reducing maintenance costs and facilitating product upgrades. In addition, by dividing the main body 10 of the chassis into two independent modules, the first chassis 11 and the second chassis 12, they can be designed and manufactured separately. Since the first chassis 11 and the second chassis 12 provide different functions, their structures will inevitably differ. Independent processing of the first chassis 11 and the second chassis 12 also helps simplify the overall processing flow of the equipment and allows the first chassis 11 and the second chassis 12 to be processed simultaneously on different production lines or workstations, thereby greatly shortening the production cycle and improving production efficiency.

[0064] For a specific structural form of the first housing 11, please refer to the appendix of the instruction manual. Figures 1-4The top of the first housing 11 is provided with a top plate 113. The end of the top plate 113 away from the second housing 12 forms a first edge 1132. The top plate 113 is provided with side plates 114 on opposite sides in the width direction. The side plate 114 away from the second housing 12 forms a second edge 1141 that slopes downward from top to bottom in the direction away from the second housing 12. The bottom of the two side plates 114 are connected by a bottom plate 115. The bottom plate 115 away from the second housing 12 forms a third edge 1151. Based on this, the first edge 1132, the second edge 1141 and the third edge 1151 are connected and enclosed to form a return air vent 111 and a clearance vent 112. The key point of this embodiment is that the side panel 114, on the side away from the second housing 12, has a second edge 1141 that slopes downwards from top to bottom in a direction away from the second housing 12. Since the first edge 1132 and the third edge 1151 are respectively connected to the second edge 1141, and the second edge 1141 has an inclined structure, this results in the top panel 113 and the bottom panel 115 not having the same dimensions in the length direction of the chassis body 10. This causes the return air vent 111 and the clearance opening 112 to be separated when the supporting body 20 is no longer present. While forming an overall downward-sloping opening structure, the side plates 114 do not obstruct the relevant components in the return air cavity. Especially in the above embodiment where the fan assembly 13 is set to be exposed at least partially through the return air inlet 111 and the clearance opening 112 to the main body of the casing 10, the inclined second plate edge 1141 can also better expose the impeller 132, thereby providing operators with more operating space and allowing the fan assembly 13 to better act on the indoor air, improving the air circulation efficiency of the air conditioning system.

[0065] Based on the above embodiments, in some other embodiments, the first housing 11 further includes a back plate 116. The back plate 116 is located on the side of the first housing 11 near the second housing 12, and is used to connect the top plate 113, the side plate 114, and the bottom plate 115. This serves to enhance the overall structural strength of the first housing 11 and also provides sufficient mounting space for the second housing 12 on the first housing 11. However, it should be noted that in order to ensure that the internal spaces of the first housing 11 and the second housing 12 can communicate with each other, the back plate 116 needs to have openings that penetrate through its opposite sides. The two sides of the openings respectively connect the internal spaces of the first housing 11 and the second housing 12, so that air can flow smoothly from the first housing 11 to the second housing 12.

[0066] In addition, the top plate 113, at the end furthest from the second housing 12, is provided with a downwardly folded mounting plate 1131, the end of which forms a first edge 1132. The folded edge design of the top plate 113 effectively enhances the overall structural strength of the first housing 11, providing additional support to the top of the first housing 11. This helps the first housing 11 resist pressure and load from its internal components and the second housing 12 when installed on the support body 20, thus improving the stability and durability of the return air box in the installed state.

[0067] Meanwhile, the mounting plate 1131 also provides a stable support mounting position for the first box 11 when it is installed on the support body 20, making it easier for the return air box to be connected and fixed to the support body 20.

[0068] This embodiment also provides an indoor air conditioning unit. For example, the indoor air conditioning unit is a wall-mounted air conditioner. The indoor air conditioning unit adopts the return air box as described in any of the above embodiments, and on this basis, a coil assembly 14 is also provided in the return air box. By installing the rear side of the return air box on the corresponding support body 20 (such as a wall, ceiling, etc.), the support body 20 can block the clearance opening 112, thereby forming a return air inlet 111 with the lower side of the casing body 10. During the operation of the fan assembly 13, indoor air can enter the return air cavity through the return air inlet 111 and flow from the return air inlet 111 to the air outlet 121 in the return air cavity. During the air flow, it will pass through the coil assembly 14 and exchange heat with the coil assembly 14. Finally, after the air is discharged outside the casing body 10 through the air outlet 121, the purpose of regulating the indoor temperature is achieved.

[0069] After the chassis body 10 is removed from the corresponding support body 20, the clearance opening 112 is no longer blocked by the support body 20. This allows the operating space provided at the rear of the chassis body 10 to be further expanded in conjunction with the clearance opening 112, based on the return air vent 111, so as to facilitate the operator to carry out subsequent inspection and maintenance operations.

[0070] Based on the above, this embodiment also provides an air conditioning system, which includes an indoor unit as described in the above embodiments. In addition to the indoor unit, the air conditioning system also includes an outdoor unit, refrigerant pipes, a control system, and other necessary components. The structure and function of the indoor unit, as one of the core components of the air conditioning system, have been described in detail in the above embodiments, and therefore will not be further elaborated in this embodiment. Through the design and optimization of the return air box, the indoor unit can provide sufficient operating space for operators, thereby reducing the difficulty of its maintenance and repair. The outdoor unit is usually installed in the outdoor space to provide the cold or heat source required by the air conditioning system. When the air conditioning system is running, the outdoor unit is connected to the indoor unit through refrigerant pipes, circulating the refrigerant (heat) between the outdoor unit and the indoor unit to achieve the function of cooling or heating.

[0071] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0072] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0073] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0074] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A return air box characterized by, The application relates to a cabinet body (10) which is configured to be mounted on a support body (20) at the rear side, a hollow return air cavity is formed in the cabinet body (10), a return air opening (111) is formed in the upper side or the lower side of the cabinet body (10) and is connected to the return air cavity, and a position avoiding opening (112) is formed in the rear side of the cabinet body (10) and is connected to the return air opening (111). A fan assembly (13) is arranged in the return air cavity. The return air opening (111) extends along the width direction of the cabinet body (10).

2. The return air box of claim 1, wherein, The position avoiding opening (112) has the same size as the return air opening (111) along the width direction of the cabinet body (10).

3. The return air box of claim 2, wherein, The fan assembly (13) is arranged at one end of the return air cavity close to the return air opening (111) and the position avoiding opening (112), and at least part of the fan assembly (13) is exposed outside the cabinet body (10) through the return air opening (111) and the position avoiding opening (112).

4. The return air box of any one of claims 1-3, wherein, The fan assembly (13) comprises: A motor (131); and An impeller (132) which is drivingly connected to the motor (131). The motor (131) is provided with two output shafts (1311) which rotate synchronously at the two ends.

5. The return air box of claim 4, wherein, The impeller (132) is provided with two impellers (132) which are coaxially connected to the two output shafts (1311) of the motor (131) and are arranged in the return air cavity along the width direction of the cabinet body (10). The cabinet body (10) comprises:

6. The return air box of claim 1, wherein, A first cabinet (11) which provides a mounting space for the fan assembly (13), the return air opening (111) and the position avoiding opening (112) are formed in the first cabinet (11); and A second cabinet (12) which is mounted at one end of the first cabinet (11) away from the return air opening (111) and the position avoiding opening (112), the inside of the second cabinet (12) is connected to the inside of the first cabinet (11) to form the return air cavity, an air outlet (121) is formed in one end of the second cabinet (12) away from the first cabinet (11) and is connected to the return air cavity, and the inside of the second cabinet (12) provides a mounting space for a coil assembly (14). A top plate (113) is arranged on the top of the first cabinet (11), and a first plate edge (1132) is formed in one end of the top plate (113) away from the second cabinet (12).

7. The return air box of claim 6, wherein, Side plates (114) are arranged on the opposite sides of the top plate (113) along the width direction, and a second plate edge (1141) is formed in one side of the side plate (114) away from the second cabinet (12) and inclines from the top to the bottom along the direction away from the second cabinet (12) to the direction close to the second cabinet (12). The bottoms of the two side plates (114) are connected through a bottom plate (115), and a third plate edge (1151) is formed in one side of the bottom plate (115) away from the second cabinet (12). ​ The first plate edge (1132), the second plate edge (1141) and the third plate edge (1151) are connected to form the return air outlet (111) and the avoiding position outlet (112).

8. The return air box of claim 7, wherein, The top plate (113) is provided with a downwardly folded mounting plate member (1131) at one end away from the second cabinet (12), and the mounting plate member (1131) is formed with the first plate edge (1132) at one end away from the first cabinet (11).

9. An air conditioner indoor unit characterized by comprising: The air conditioner indoor unit comprises the return air box.

10. An air conditioning system characterized by, The air conditioner indoor unit comprises the return air box.

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