Air return box body and duct type air conditioner

Abstract

The utility model discloses an air return box and a duct type air conditioner. The air return box body comprises a main body provided with an air outlet and an air return opening; the top cover is detachably connected with the main body; the first reinforcing piece is arranged on the top cover and is arranged in the length direction of the top cover; the distance between the first reinforcing piece and the air outlet is smaller than the distance between the first reinforcing piece and the air return opening.

Description

Technical Field

[0001] The present application belongs to the field of electrical equipment technology, and specifically relates to a return air box and a duct machine. Background Art

[0002] Duct air conditioner is a kind of air conditioner. Its principle is basically the same as that of central air conditioner. It uses air conditioner to connect air duct to supply air to the room. Because of its large size, it usually needs to be hidden inside the ceiling for the sake of beauty.

[0003] In order to carry the fan components of the duct air conditioner, the duct air conditioner is generally provided with a return air box. However, in the prior art, the structural strength of the return air box of the duct air conditioner cannot meet the requirements. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a return air box and a duct air conditioner, aiming to at least solve the technical problem that the structural strength of the return air box of the duct air conditioner cannot meet the requirements to a certain extent.

[0005] The technical solution of the utility model is:

[0006] A return air box body is special in that it includes: a main body, which is provided with an air outlet and a return air outlet; a top cover, which is detachably connected to the main body; a first reinforcement member, which is arranged on the top cover and along the length direction of the top cover; wherein the distance between the first reinforcement member and the air outlet is smaller than the distance between the first reinforcement member and the return air outlet.

[0007] Since the main body is provided with an air outlet and a return air outlet, the top cover is detachably connected to the main body, and the first reinforcement is arranged on the top cover and along the length direction of the top cover. Therefore, the structural strength of the top cover can be increased in the length direction through the first reinforcement, and then the structural strength of the return air box body can be ensured in the length direction of the heat exchange box body, reducing the possibility of deformation or damage of the return air box body, thereby increasing the service life of the return air box body and improving the user experience. The air outlet is connected to the heat exchange box body to convey the airflow to the heat exchange box body. The air outlet side of the main body is connected to the heat exchange box body. The air outlet side of the main body is the main bearing area, that is, the position of the top cover close to the air outlet is subjected to greater force. Since the distance between the first reinforcement and the air outlet is smaller than the distance between the first reinforcement and the return air outlet, the structural strength of the area of ​​the top cover close to the air outlet can be increased through the first reinforcement, reducing the possibility of deformation or damage of the top cover, thereby increasing the service life of the top cover and improving the user experience. At the same time, there is no need to strengthen the top cover as a whole, thereby reducing costs.

[0008] In some embodiments, the first reinforcement member is located at an edge of the top cover.

[0009] In some embodiments, the length of the first reinforcement is 1 / 2 to 1 of the length of the top cover.

[0010] In some embodiments, the return air box body also includes: a second reinforcement member, which is provided on the top cover and arranged along the length direction of the top cover; wherein the distance between the second reinforcement member and the air outlet is greater than the distance between the second reinforcement member and the return air outlet.

[0011] In some embodiments, the return air box body also includes a chassis connected to the main body, and the return air box body also includes: a third reinforcement member, which is arranged on the chassis and along the length direction of the chassis; wherein the distance between the third reinforcement member and the air outlet is smaller than the distance between the third reinforcement member and the return air outlet.

[0012] Based on the same utility model concept, the utility model also provides a duct air conditioner, including a heat exchange box and the return air box, wherein the main body, the bottom plate and the top cover of the return air box can be detachably connected to the return air box.

[0013] In some embodiments, one of the top cover and the heat exchange box body is provided with a first limiting column, and the other is provided with a first limiting hole, and the first limiting column can be inserted into the first limiting hole.

[0014] In some embodiments, when the top cover is provided with the first limiting holes and there are a plurality of the first limiting holes, the plurality of the first limiting holes are spaced apart along the length direction of the top cover.

[0015] In some embodiments, one of the base plate and the heat exchange box is provided with a second limiting column, and the other is provided with a second limiting hole, and the second limiting column can be inserted into the second limiting hole.

[0016] In some embodiments, when the chassis is provided with the second limiting holes and there are a plurality of the second limiting holes, the plurality of the second limiting holes are spaced apart along the length direction of the chassis. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the structure of the return air box body of some embodiments;

[0019] Figure 2 for Figure 1 Structural schematic diagram of the top cover of the middle return air box;

[0020] Figure 3 It is a schematic diagram of the structure of the air duct machine of some embodiments;

[0021] Figure 4 for Figure 3 Schematic diagram of the structure of the heat exchange box of the medium-wind tube air conditioner.

[0022] In the attached figure:

[0023] Main body 10, air outlet 101, air return port 102;

[0024] Top cover 20;

[0025] A first reinforcement member 30;

[0026] Heat exchange box 40;

[0027] Chassis 50;

[0028] A first limiting column 60;

[0029] A first limiting hole 70;

[0030] A second limiting column 80;

[0031] The second limiting hole 90. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0037] The return air box and duct air conditioner provided in this embodiment are intended to at least to a certain extent solve the technical problem that the structural strength of the return air box of the duct air conditioner cannot meet the requirements.

[0038] Figure 1 It is a schematic diagram of the structure of the return air box body of some embodiments; Figure 2 for Figure 1 Schematic diagram of the structure of the top cover of the middle return air box. Figure 1 and Figure 2 The return air box body of the embodiment of the present application includes: a main body 10, a top cover 20 and a first reinforcement 30. The main body 10 is provided with an air outlet 101 and a return air outlet 102. The top cover 20 is detachably connected to the main body 10. The first reinforcement 30 is arranged on the top cover 20 and is arranged along the length direction of the top cover 20. Among them, the distance between the first reinforcement 30 and the air outlet 101 is smaller than the distance between the first reinforcement 30 and the return air outlet 102.

[0039] The air outlet 101 and the air return outlet 102 are arranged opposite to each other.

[0040] Since the main body 10 is provided with an air outlet 101 and an air return outlet 102, the top cover 20 is detachably connected to the main body 10, and the first reinforcement member 30 is provided on the top cover 20 and is provided along the length direction of the top cover 20, so that the structural strength of the top cover 20 can be increased in the length direction through the first reinforcement member 30, and then the structural strength of the return air box body can be ensured in the length direction of the return air box body, and the possibility of deformation or damage of the return air box body can be reduced, so as to increase the service life of the return air box body and improve the user experience. The air outlet 101 is connected to the heat exchange box body 40 to convey the air flow to the heat exchange box body 40, and the main body 1 0 is connected to the heat exchange box body 40, and the air outlet side of the main body 10 is the main load-bearing area, that is, the position of the top cover 20 close to the air outlet 101 is subjected to greater force. Since the distance between the first reinforcement 30 and the air outlet 101 is smaller than the distance between the first reinforcement 30 and the return air outlet 102, the first reinforcement 30 can improve the structural strength of the area of ​​the top cover 20 close to the air outlet 101, and reduce the possibility of deformation or damage of the top cover 20, so as to increase the service life of the top cover 20 and improve the user experience. At the same time, there is no need to strengthen the top cover 20 as a whole, which reduces the cost.

[0041] In some embodiments, in order to reduce the difficulty of processing and to ensure the stability of the connection between the first reinforcement member 30 and the top cover 20, the first reinforcement member 30 can be welded to the top cover 20. Of course, in some other embodiments, the first reinforcement member 30 can be integrally formed with the top cover 20.

[0042] Combination Figure 2 In some embodiments, in order to further improve the structural strength of the top cover 20, the first reinforcement 30 is located at the edge of the top cover 20, so that the first reinforcement 30 can be closer to the heat exchange box body 40. The first reinforcement 30 can improve the structural strength of the connection area between the top cover 20 and the heat exchange box body 40, and reduce the possibility of deformation or damage of the top cover 20, so as to increase the service life of the top cover 20 and improve the user experience.

[0043] Combination Figure 2 In some embodiments, in order to ensure that the first reinforcement 30 can play a role in strengthening the structural strength of the top cover 20, the length of the first reinforcement 30 is 1 / 2 to 1 of the length of the top cover 20, which can increase the structural strength of the top cover 20 in the length direction, and then ensure the structural strength of the return air box in the length direction of the return air box, reduce the possibility of deformation or damage of the return air box, and thus increase the service life of the return air box.

[0044] Combination Figure 2In some embodiments, in order to ensure that the first reinforcement 30 can play a role in strengthening the structural strength of the top cover 20, the thickness of the first reinforcement 30 is greater than or equal to the thickness of the top cover 20, which can increase the structural strength of the top cover 20 in the length direction, and then ensure the structural strength of the return air box in the length direction of the return air box, reduce the possibility of deformation or damage to the return air box, and thus increase the service life of the return air box.

[0045] Combination Figure 2 In some embodiments, in order to ensure that the first reinforcement 30 can play a role in strengthening the structural strength of the top cover 20, the width of the first reinforcement 30 is greater than or equal to 10 mm, which can increase the structural strength of the top cover 20 in the length direction, and then ensure the structural strength of the return air box in the length direction of the return air box, reduce the possibility of deformation or damage to the return air box, and thus increase the service life of the return air box.

[0046] In some embodiments, in order to further improve the structural strength of the top cover 20, the return air box body further includes: a second reinforcement member. The second reinforcement member is disposed on the top cover 20 and is disposed along the length direction of the top cover 20. The distance between the second reinforcement member and the air outlet 101 is greater than the distance between the second reinforcement member and the return air outlet 102. The second reinforcement member can be disposed at the edge of the top cover 20.

[0047] In some embodiments, in order to achieve return air, the return air outlet 102 is generally connected to the return air duct, that is, the side of the top cover 20 close to the return air outlet 102 will also be subjected to force. By setting a second reinforcement on the top cover 20, at the same time, the distance between the second reinforcement and the air outlet 101 is greater than the distance between the second reinforcement and the return air outlet 102, so that the second reinforcement is closer to the return air outlet 102. The second reinforcement can improve the structural strength of the area of ​​the top cover 20 close to the return air outlet 102, and reduce the possibility of deformation or damage of the top cover 20, so as to increase the service life of the top cover 20 and improve the user experience. At the same time, there is no need to strengthen the top cover 20 as a whole, thereby reducing costs.

[0048] In some embodiments, in order to further improve the structural strength of the return air box, the return air box further includes a chassis 50 connected to the main body 10, and the return air box further includes: a third reinforcement. The third reinforcement is provided on the chassis 50 and is provided along the length direction of the chassis 50. The third reinforcement can increase the structural strength of the chassis 50 in the length direction, thereby ensuring the structural strength of the return air box in the length direction of the return air box, reducing the possibility of deformation or damage to the return air box, thereby increasing the service life of the return air box and improving the user experience.

[0049] In some embodiments, since the chassis 50 is also connected to the heat exchange box 40, the position of the chassis 50 near the air outlet 101 is subjected to greater force, and the distance between the third reinforcement and the air outlet 101 is smaller than the distance between the third reinforcement and the return air outlet 102, so that the third reinforcement is closer to the air outlet 101. The third reinforcement can improve the structural strength of the area of ​​the chassis 50 near the air outlet 101, reduce the possibility of deformation or damage of the chassis 50, so as to increase the service life of the chassis 50 and improve the user experience. At the same time, there is no need to strengthen the chassis 50 as a whole, which reduces the cost. Among them, the third reinforcement can be set at the edge of the chassis 50.

[0050] In some embodiments, in order to further improve the structural strength of the return air box, the return air box further includes a chassis 50 connected to the main body 10, and the return air box further includes: a fourth reinforcement. The fourth reinforcement is arranged on the chassis 50 and arranged along the length direction of the chassis 50. The third reinforcement can increase the structural strength of the chassis 50 in the length direction, thereby ensuring the structural strength of the return air box in the length direction of the return air box, reducing the possibility of deformation or damage of the return air box, thereby increasing the service life of the return air box and improving the user experience.

[0051] In some embodiments, the position of the chassis 50 near the return air outlet 101 will also be stressed, and the distance between the fourth reinforcement and the air outlet 101 is greater than the distance between the fourth reinforcement and the return air outlet 102, so that the fourth reinforcement is closer to the return air outlet 102. The fourth reinforcement can improve the structural strength of the area of ​​the chassis 50 near the return air outlet 102, reduce the possibility of deformation or damage of the chassis 50, thereby increasing the service life of the chassis 50 and improving the user experience. At the same time, there is no need to strengthen the chassis 50 as a whole, reducing costs. Among them, the fourth reinforcement can be set at the edge of the chassis 50.

[0052] In some embodiments, in order to ensure aesthetics, the first reinforcement 30 is located on the end surface of the top cover 20 facing the chassis 50, the second reinforcement is located on the end surface of the top cover 20 facing the chassis 50, the third reinforcement is located on the end surface of the chassis 50 facing the top cover 20, and the fourth reinforcement is located on the end surface of the chassis 50 facing the top cover 20. In other words, the first reinforcement 30, the second reinforcement, the third reinforcement and the fourth reinforcement are all arranged in the main body 10, and the first reinforcement 30, the second reinforcement, the third reinforcement and the fourth reinforcement can be shielded by the main body 10, the top cover 20 and the chassis 50 to avoid the first reinforcement 30, the second reinforcement, the third reinforcement and the fourth reinforcement being exposed to the outside, thereby ensuring aesthetics.

[0053] Based on the same utility model concept, the present application also proposes a duct air conditioner, which adopts the return air box. The specific structure of the return air box refers to the above-mentioned embodiment. Since the return air box adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0054] Combination Figure 3 In some embodiments, in order to facilitate the installation of the duct air conditioner, the duct air conditioner includes a heat exchange box body 40, and the main body 10, the bottom plate 50 and the top cover 20 of the return air box body can be detachably connected to the return air box body 40.

[0055] In some embodiments, when the duct air conditioner is to be installed, the heat exchange box 40 and the return air box can be carried separately. The volume and weight of the heat exchange box 40 and the return air box are reduced compared to the whole duct air conditioner, which facilitates the transportation of the heat exchange box 40 and the return air box to the installation location and avoids the transportation difficulties caused by the small space. When the heat exchange box 40 and the return air box arrive at the installation, the return air box is installed on the heat exchange box to complete the installation of the duct air conditioner, which facilitates the installation of the heat exchange box 40 and the return air box and improves the assembly efficiency.

[0056] Figure 4 for Figure 3 The structural diagram of the heat exchange box of the medium-wind tube air conditioner. Figure 1 and Figure 4 In some embodiments, in order to further improve the structural strength of the return air box body, one of the top cover 20 and the heat exchange box body 40 is provided with a first limiting column 60, and the other is provided with a first limiting hole 70, and the first limiting column 60 can be inserted into the first limiting hole 70.

[0057] In some embodiments, when the return air box is to be installed on the heat exchange box 40, the first limiting column 60 can be inserted into the first limiting hole 70 to determine the installation position of the return air box, ensure the accuracy of the installation position of the return air box, and when the return air box is fastened to the heat exchange box 40, it is not necessary to support the return air box, which is convenient for the installer to install the return air box, reduce the installation difficulty, reduce the workload, and improve the installation efficiency. At the same time, after the return air box is installed on the heat exchange box 40, through the cooperation of the first limiting column 60 and the first limiting hole 70, the first limiting column 60 can carry the return air box and bear the weight of the return air box, further improve the structural strength of the return air box, reduce the possibility of deformation or damage of the return air box, so as to increase the service life of the return air box and improve the user experience.

[0058] In some embodiments, the top cover 20 may be provided with a first limiting column 60, and the heat exchange box body 40 may be provided with a first limiting hole 70. Of course, in other embodiments, the heat exchange box body 40 may be provided with a first limiting column 60, and the top cover 20 may be provided with a first limiting hole 70.

[0059] Combination Figure 1 and Figure 4 In some embodiments, in order to ensure the structural strength of the return air box body in the length direction of the return air box body, a first limiting hole 70 is opened in the top cover 20, and when the number of the first limiting holes 70 is multiple, the multiple first limiting holes 70 are spaced apart along the length direction of the top cover 20, that is, the first limiting column 60 can support the top cover 20 in the length direction of the top cover 20, and the first limiting column 60 can support the return air box body in the length direction of the return air box body, and can bear the weight of the return air box body, further improving the structural strength of the return air box body, and reducing the possibility of deformation or damage of the return air box body, so as to increase the service life of the return air box body and improve the user experience.

[0060] Combination Figure 1 and Figure 4 In some embodiments, in order to further improve the structural strength of the return air box, one of the chassis 50 and the heat exchange box 40 is provided with a second limiting column 80, and the other is provided with a second limiting hole 90, and the second limiting column 80 can be inserted into the second limiting hole 90.

[0061] In some embodiments, when the return air box is to be installed on the heat exchange box 40, the second limiting column 80 can be inserted into the second limiting hole 90 to determine the installation position of the return air box, ensure the accuracy of the installation position of the return air box, and when the return air box is fastened to the heat exchange box 40, it is not necessary to support the return air box, which is convenient for the installer to install the return air box, reduce the installation difficulty, reduce the workload, and improve the installation efficiency. At the same time, after the return air box is installed on the heat exchange box 40, through the cooperation of the second limiting column 80 and the second limiting hole 90, the second limiting column 80 can support the return air box, can bear the weight of the return air box, further improve the structural strength of the return air box, reduce the possibility of deformation or damage of the return air box, so as to increase the service life of the return air box and improve the user experience.

[0062] In some embodiments, the chassis 50 may be provided with a second limiting column 80, and the heat exchange box 40 may be provided with a second limiting hole 90. Of course, in other embodiments, the heat exchange box 40 may be provided with a second limiting column 80, and the chassis 50 may be provided with a first limiting hole 90.

[0063] Combination Figure 1 and Figure 4In some embodiments, in order to ensure the structural strength of the return air box in the length direction of the return air box, a second limiting hole 90 is opened on the chassis 50, and when the number of the second limiting holes 90 is multiple, the multiple second limiting holes 90 are spaced apart along the length direction of the chassis, that is, the second limiting column 80 can support the top cover 20 in the length direction of the top cover 20, and the second limiting column 80 can carry the return air box in the length direction of the return air box, and can bear the weight of the return air box, further improving the structural strength of the return air box, and reducing the possibility of deformation or damage of the return air box, so as to increase the service life of the return air box and improve the user experience.

[0064] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0065] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0066] In the description of the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0068] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0069] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A return air box, characterized in that: include: The main body is provided with an air outlet and an air return outlet; A top cover, detachably connected to the main body; A first reinforcement member is provided on the top cover and is arranged along the length direction of the top cover; Wherein, the distance between the first reinforcement and the air outlet is smaller than the distance between the first reinforcement and the return air outlet.

2. The return air box according to claim 1, characterized in that: The first reinforcement member is located at an edge of the top cover.

3. The return air box according to claim 1, characterized in that: The length of the first reinforcement is 1 / 2 to 1 / 2 of the length of the top cover.

4. The return air box according to any one of claims 1 to 3, characterized in that: The return air box also includes: A second reinforcement member is provided on the top cover and arranged along the length direction of the top cover; Wherein, the distance between the second reinforcement and the air outlet is greater than the distance between the second reinforcement and the return air outlet.

5. The return air box according to any one of claims 1 to 3, characterized in that: The return air box body also includes a chassis connected to the main body, and the return air box body also includes: A third reinforcement member is provided on the chassis and arranged along the length direction of the chassis; Wherein, the distance between the third reinforcement and the air outlet is smaller than the distance between the third reinforcement and the return air outlet.

6. A duct machine, characterized in that: It comprises a heat exchange box and a return air box as described in any one of claims 1 to 5, wherein the main body, the bottom plate and the top cover of the return air box are detachably connected to the return air box.

7. The air duct machine according to claim 6, characterized in that: One of the top cover and the heat exchange box body is provided with a first limiting column, and the other is provided with a first limiting hole, and the first limiting column can be inserted into the first limiting hole.

8. The air duct machine according to claim 7, characterized in that: When the top cover is provided with the first limiting holes and there are a plurality of the first limiting holes, the plurality of the first limiting holes are spaced apart along the length direction of the top cover.

9. The air duct machine according to claim 6, characterized in that: One of the base plate and the heat exchange box is provided with a second limiting column, and the other is provided with a second limiting hole, and the second limiting column can be inserted into the second limiting hole.

10. The air duct machine according to claim 9, characterized in that: When the chassis is provided with the second limiting holes and there are a plurality of the second limiting holes, the plurality of the second limiting holes are spaced apart along the length direction of the chassis.

Images