CN219775927U - Air duct assembly and air treatment unit - Google Patents

Abstract

The utility model discloses an air duct assembly and an air treatment unit, and relates to the technical field of air conditioning equipment. The shell is provided with an air inlet and an air outlet, and an air channel which is communicated with the air inlet and the air outlet is formed in the shell; the fixed plate is connected with the shell, and is provided with a communication port which is communicated with an air duct formed on one side of the fixed plate and a separation cavity formed on the other side of the fixed plate; the baffle is connected in the fixed plate, and the baffle can rotate for the fixed plate to show or shelter from the intercommunication mouth. When the electric auxiliary heating module is installed, the baffle plate can rotate to expose the communication port, and the electric auxiliary heating module penetrates into the air duct through the communication port; after dismantling the electricity and assisting the hot module, the baffle can rotate and shelter from the intercommunication mouth, reduces the air leakage condition in wind channel, promotes the air-out effect. The baffle plate does not need to be disassembled and assembled in the use process, and solves the problems that the existing split baffle plate is difficult to assemble and easy to lose after being disassembled.

Description

Air duct assembly and air treatment unit

Technical Field

The utility model relates to the technical field of air conditioning equipment, in particular to an air duct assembly and an air treatment unit.

Background

In order to solve the installation problem of the electric auxiliary thermal module, the air treatment unit is provided with a communication port between the air duct and the front separation cavity, so that the electric auxiliary thermal module is convenient to install through the communication port. Because the electric auxiliary thermal module can be detached and installed as required, when the electric auxiliary thermal module is not installed, the air treatment unit in the related art generally adopts a detachable baffle to seal the communication port. However, the baffle plate has problems of easy loss after disassembly and difficult installation.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the air duct assembly, which can realize the exposure or shielding of the communication port through the rotation of the baffle plate, and avoid the disassembly and the installation operations of the baffle plate.

The utility model further provides an air treatment unit with the air duct assembly.

An air duct assembly according to an embodiment of the first aspect of the present utility model includes: the shell is provided with an air inlet and an air outlet, and an air channel which is communicated with the air inlet and the air outlet is formed in the shell; the fixed plate is connected with the shell and is provided with a communication port, and the communication port is communicated with the air duct formed on one side of the fixed plate and the separation cavity formed on the other side of the fixed plate; the baffle is connected to the fixed plate, and the baffle can rotate relative to the fixed plate so as to expose or shield the communication port.

The air duct assembly provided by the embodiment of the utility model has at least the following beneficial effects:

through being equipped with the fixed plate setting of intercommunication mouth and can exposing or shelter from and shelter from the intercommunication mouth for fixed plate pivoted baffle, the baffle can reveal. When the electric auxiliary heating module is installed, the baffle plate can rotate to expose the communication port, and the electric auxiliary heating module penetrates into the air duct through the communication port; after dismantling the electricity and assisting the hot module, the baffle can rotate and shelter from the intercommunication mouth, reduces the air leakage condition in wind channel, promotes the air-out effect. The baffle of this embodiment need not dismantle and install in the use, has solved the split baffle installation difficulty of prior art to and dismantle the easy problem that loses.

According to some embodiments of the utility model, the air duct assembly further comprises a connection assembly that connects the baffle and the fixing plate, respectively.

According to some embodiments of the utility model, the connecting assembly comprises a retaining buckle and a retaining pin, the retaining pin is rotatably connected in the retaining buckle, the baffle is provided with one of the retaining pin or the retaining buckle, and the retaining plate is provided with the other of the retaining pin and the retaining buckle.

According to some embodiments of the utility model, the fixing plate is provided with a mounting seat, the fixing buckle is connected to the mounting seat, and the fixing pin is connected to the baffle plate and inserted into a reaming hole of the fixing buckle.

According to some embodiments of the utility model, the mounting seat is provided with a slot, the fixing buckle is provided with an inserting sheet inserted into the slot, and the inserting sheet and the mounting seat are connected through a fastener.

According to some embodiments of the utility model, the baffle comprises a first baffle and a second baffle which are sequentially arranged at intervals along the airflow direction of the air duct, and the first baffle and the second baffle can rotate towards opposite directions so as to cover the communication port.

According to some embodiments of the utility model, the first baffle is provided with a first stop for abutting against the fixed plate when the first baffle is in a position perpendicular to the fixed plate; and/or the second baffle is provided with a second stop part, and the second stop part is used for abutting against the fixed plate when the second baffle is in a position perpendicular to the fixed plate.

According to some embodiments of the utility model, the first baffle and the second baffle are in a position perpendicular to the fixed plate, and a length of the first baffle is greater than a length of the second baffle in a direction perpendicular to the fixed plate.

According to some embodiments of the utility model, the first baffle is provided with a first connection portion and the second baffle is provided with a second connection portion, the second connection portion being detachably connected with the second connection portion.

An air handling unit according to an embodiment of the second aspect of the utility model comprises the duct assembly described in the above embodiments.

The air treatment unit provided by the embodiment of the utility model has at least the following beneficial effects:

adopt the wind channel subassembly of first aspect embodiment, wind channel subassembly can expose or shelter from the intercommunication mouth through setting up at the fixed plate that is equipped with the intercommunication mouth for fixed plate pivoted baffle, baffle. When the electric auxiliary heating module is installed, the baffle plate can rotate to expose the communication port, and the electric auxiliary heating module penetrates into the air duct through the communication port; after the electric auxiliary thermal module is disassembled, the baffle can rotate to shield the communication port, so that the air leakage condition of the air duct is reduced, and the air outlet effect of the air treatment unit is improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of an air handling unit according to an embodiment of the present utility model;

FIG. 2 is a schematic perspective view of the air treatment unit of FIG. 1 with a portion of the peripheral wall of the housing cut away;

FIG. 3 is a schematic cross-sectional view of the air treatment unit shown in FIG. 1;

FIG. 4 is a cross-sectional perspective view of the air treatment unit shown in FIG. 1 with the baffle plate exploded;

FIG. 5 is an enlarged view of FIG. 4 at A;

FIG. 6 is a schematic cross-sectional view of the air treatment unit of FIG. 1 at another angle with the baffle in a blocking state;

FIG. 7 is an enlarged view at B in FIG. 6;

FIG. 8 is an enlarged view of the bezel of FIG. 7 in an exposed state;

FIG. 9 is a schematic perspective view of a portion of a peripheral wall of a housing of an air treatment unit with an electric auxiliary thermal module mounted into an air duct, in accordance with an embodiment of the present utility model;

fig. 10 is an enlarged view at C in fig. 9.

Reference numerals:

a duct assembly 100;

a housing 110; an air inlet 111; an air outlet 112;

a fixing plate 120; a communication port 121; a mounting base 122; a slot 123;

an air duct 130;

a compartment 140;

a case 150; a peripheral wall 151;

a door 160;

a baffle 170; a first baffle 171; a second baffle 172; a first stop 173; a second stop 174; a first connection portion 175; a second connection portion 176;

a connection assembly 180; a fixing buckle 181; reaming 1811; insert 1812; a fixing pin 182;

a mounting frame 200;

a blower 300; an air outlet 310;

and an electric auxiliary thermal module 400.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

The air handling unit, also called an American air duct machine, is generally installed in an attic or a basement, and is generally constructed by assembling a plurality of module boxes due to the complex installation environment and narrow installation space. An air handling unit of an embodiment of the present utility model includes a heat exchange box and a fan box. The heat exchanger is installed in the heat exchange box, and the fan is installed in the fan box. The heat exchange box and the fan case are constructed into two independent module cases, and the heat exchange box and the fan case are detachably connected, so that the heat exchange box and the fan case can be respectively carried after being detached, and then are quickly assembled during installation, thereby being convenient for installation personnel to install in a narrow installation space, reducing the installation difficulty and improving the installation efficiency. It can be appreciated that due to the narrow installation space, when the air handling unit needs maintenance or cleaning, the maintenance convenience can be improved by adopting the detachable structure of the heat exchange box and the fan box.

It will be appreciated that the air treatment unit of another embodiment of the present utility model may also be of unitary design, i.e. the heat exchanger and the fan are mounted in the same housing.

In order to clearly illustrate the technical solution of the embodiments of the present utility model, the following description will be made with respect to a modular air treatment unit. Referring to FIGS. 1 and 2, an air handling unit according to one embodiment of the present utility model includes a fan case. The fan case includes a mounting bracket 200, a fan 300, and an air duct assembly 100 forming an air duct 130. The duct assembly 100 includes a housing 110 and a fixing plate 120. The two ends of the shell 110 are respectively provided with an air inlet 111 and an air outlet 112, an air duct 130 is formed in the shell 110, and the air inlet 111 and the air outlet 112 are respectively communicated with the two ends of the air duct 130. After the air flow in the indoor environment or the outdoor environment exchanges heat through the heat exchange box, the air flows out from the air inlet 111 to the fan box and is discharged into the indoor environment through the air outlet 112, so that the temperature regulation of the indoor environment is realized. The fan 300 creates a negative pressure to provide motive force for the airflow to flow from the air inlet 111 to the air outlet 112.

Referring to fig. 3, it will be appreciated that the fixing plate 120 and the mounting bracket 200 are installed in the housing 110, and the fixing plate 120 and the mounting bracket 200 separate the inner space of the housing 110 from the compartment 140. One side of the fixing plate 120 is a compartment 140, and the other side of the fixing plate 120 is an air duct 130, i.e. the fixing plate 120 separates the compartment 140 from the air duct 130. The fan 300 is installed in the housing 110 through the installation frame 200, and the fan 300 is typically a centrifugal fan, which can intake air from two sides, and the air outlet 310 of the centrifugal fan is opposite to the air outlet 112.

Referring to fig. 1 and 2, in order to facilitate installation and maintenance of components inside the fan case, the fan case includes a case body 150 and a case door 160. The case 150 includes a peripheral wall 151, and one side of the peripheral wall 151 is provided with an opening. The door 160 is connected to the peripheral wall 151 and provided at the opening, and the door 160 is used for closing the opening. When the door 160 is opened, the blower 300 may be directly installed into the cabinet 150 through the opening. The fixing plate 120 is provided with a communication port 121, the communication port 121 communicates the air duct 130 and the separation chamber 140, the separation chamber 140 is positioned at one side of the box 150 facing the opening, and when the box door 160 is opened, the electric auxiliary heating module 400 can be installed in the air duct 130 through the separation chamber 140. It will be appreciated that the housing 110 of the duct assembly 100 of the present embodiment is formed by part of the structure of the housing 150. As another embodiment, the housing 110 may be formed by a separate member and fixedly coupled to the case 150.

In an embodiment of the air treatment unit of the present utility model, the air duct assembly 100 further includes a baffle 170. The baffle 170 is connected to the fixed plate 120, and the baffle 170 can rotate relative to the fixed plate 120, thereby exposing or shielding the communication port 121. When the electric auxiliary thermal module 400 is installed, the baffle 170 can rotate to expose the communication port 121, and the electric auxiliary thermal module 400 penetrates into the air duct 130 through the communication port 121; when the electric auxiliary thermal module 400 is disassembled, the baffle 170 can rotate to shield the communication port 121, so that the air leakage condition of the air duct 130 is reduced, and the air outlet effect is improved. The baffle 170 of the embodiment of the utility model does not need to be disassembled and assembled in the use process, and solves the problems that the split baffle 170 in the prior art is difficult to assemble and is easy to lose after being disassembled.

Referring to fig. 1 and 2, it is understood that the position where the baffle 170 is connected to the fixed plate 120 may be located at one side of the communication port 121. For example, the baffle 170 is rotatably connected to the fixing plate 120 on the upper side of the communication port 121, the baffle 170 is rotated downward to shield the communication port 121, and the upward rotation exposes the communication port 121; the baffle 170 is rotatably connected to the fixed plate 120 at the lower side of the communication port 121, the baffle 170 can shield the communication port 121 by rotating upwards, and the communication port 121 can be exposed by rotating downwards; the baffle 170 is rotatably connected to the fixed plate 120 at the left side of the communication port 121, the baffle 170 can shield the communication port 121 by rotating rightwards, and the communication port 121 can be exposed by rotating leftwards; the baffle 170 rotates the fixed plate 120 connected to the right side of the communication port 121, the baffle 170 rotates leftwards to shield the communication port 121, and the communication port 121 is exposed when rotating rightwards.

It will be appreciated that the baffle 170 may be positioned on one side of the air duct 130 to facilitate avoidance of the electrically controlled elements of the compartment 140. The baffle 170 may also be disposed on one side of the compartment 140 to facilitate reducing the impact of the baffle 170 on the air duct 130.

Referring to fig. 2 and 3, it is to be appreciated that the duct assembly 100 further includes a connection assembly 180. The connecting component 180 may be a standard component such as a hinge or a hinge, or may be other connecting structures capable of realizing mutual rotation and high in reliability. The connection assembly 180 is respectively connected with the baffle 170 and the fixed plate 120, and the baffle 170 can rotate relative to the fixed plate 120 through the connection assembly 180, so that the rotation process is more stable. Accordingly, the baffle 170 has a longer service life and higher fatigue strength.

Referring to fig. 4, 5 and 7, the connection assembly 180 according to the embodiment of the present utility model includes a fixing buckle 181 and a fixing pin 182. The fixing buckle 181 is fixedly connected to the fixing plate 120, for example, by welding, riveting, bonding, or the like, and the fixing pin 182 is fixedly connected to the baffle 170, for example, by welding, bonding, or the like. The fixing pin 182 is rotatably connected to the fixing buckle 181, and it is understood that the fixing buckle 181 is provided with a hinge hole 1811, and the fixing pin 182 is inserted into the hinge hole 1811 and can rotate in the hinge hole 1811 to change the position of the baffle 170, so that the operation of a user or a maintenance personnel is facilitated. The combined structure of the fixing buckle 181 and the fixing pin 182 can be provided with two groups, and the two groups of combined structures are positioned at two ends of the rotation axis of the baffle 170, so that the structure is simple and stable. The combination structure of the fixing buckle 181 and the fixing pin 182 may further be provided with more groups, and the multiple groups of combination structures are arranged at intervals along the rotation axis of the baffle 170.

Referring to fig. 5, it is understood that the fixing plate 120 is provided with a mounting seat 122, and the mounting seat 122 may be integrally formed with the fixing plate 120 or may be connected to the fixing plate 120 by welding or the like. The fixing buckle 181 is connected to the mounting base 122, and since the structural strength of the fixing plate 120 can be improved by the mounting base 122, the fixing buckle 181 is connected to the mounting base 122 to improve the connection strength between the fixing buckle 181 and the fixing plate 120, so that the fixing buckle 181 is not easy to fall off from the fixing plate 120. Since the fixing pin 182 is connected to the baffle 170 and inserted into the hinge hole 1811 of the fixing buckle 181, the supporting effect of the fixing buckle 181 on the baffle 170 can be improved, and the service life of the baffle 170 can be prolonged.

Referring to fig. 5, it will be appreciated that the mounting base 122 is provided with a slot 123, and the fixing buckle 181 is provided with a tab 1812 inserted into the slot 123, and the tab 1812 and the mounting base 122 are connected by a fastener. The mounting base 122 may be formed by punching the fixing plate 120, and the fixing buckle 181 is provided with an inserting piece 1812, and the inserting piece 1812 is inserted and positioned from the opening end of the slot 123. The mounting block 122 and tab 1812 are further secured by fasteners such as screws or rivets. It can be appreciated that the fixing buckle 181 can be folded and shaped into the insert 1812 and the hinge hole 1811 by strip metal, and has simple and convenient processing and high structural strength.

As another embodiment, the fixing buckle 181 may be fixedly connected to the baffle 170, the fixing pin 182 is fixedly connected to the fixing plate 120, and the hinge hole 1811 of the fixing buckle 181 is sleeved on the fixing pin 182, so that stable rotation of the baffle 170 can be realized.

Referring to fig. 3, 6, 7 and 8, it will be appreciated that the baffle 170 includes a first baffle 171 and a second baffle 172 spaced apart in the direction of the air flow of the air duct 130 (i.e., in the bottom-up direction shown in fig. 6), i.e., the second baffle 172 is located below the first baffle 171, and the second baffle 172 is located closer to the air outlet 112 than the first baffle 171. The first shutter 171 and the second shutter 172 can be rotated in opposite directions to block the communication port 121, and the first shutter 171 and the second shutter 172 can also be rotated in opposite directions to expose the communication port 121. Referring to fig. 3, the two baffles 170 are provided to close the communication port 121, so that the distance that the baffles 170 extend toward the air duct 130 or the compartment 140 when the communication port 121 is exposed from the baffles 170 is shortened, and interference of the baffles 170 to the air duct 130 or the compartment 140 is reduced. It is understood that the first baffle 171 and the second baffle 172 may be disposed on the side of the fixing plate 120 facing the compartment 140, or may be disposed on the side of the fixing plate 120 facing the air duct 130, which is not particularly limited herein.

Referring to fig. 7, the first baffle 171 and the second baffle 172 form a gap therebetween when they are shielded, and the gap is arranged to form a thermal balance between the compartment 140 and the air duct 130, so that the temperature of the electric control element is not exposed due to excessive temperature difference, and an electrical safety hazard is generated. The slit can be realized by changing the matching size of the first baffle 171 and the second baffle 172 without grooving or perforating the first baffle 171 and the second baffle 172, thereby reducing the processing steps, improving the processing efficiency and reducing the processing cost.

Referring to fig. 9 and 10, it can be appreciated that the first barrier 171 is provided with a first stopper 173, and the first stopper 173 may be disposed perpendicular to the first barrier 171 so as to constitute an "L" type structure as a whole. When the first barrier 171 is in a position perpendicular to the fixed plate 120, the first stopper 173 abuts against the fixed plate 120, so that the first barrier 171 is supported on the fixed plate 120 and cannot rotate in a direction away from the second barrier 172 (i.e., downward in fig. 10). Likewise, the second baffle 172 is provided with a second stopper 174, and the second stopper 174 may be disposed perpendicular to the second baffle 172 so as to constitute an "L" shaped structure as a whole. When the second baffle 172 is in a position perpendicular to the fixed plate 120, the second stopper 174 abuts against the fixed plate 120, so that the second baffle 172 is supported on the fixed plate 120 and cannot rotate any more in a direction away from the first baffle 171 (i.e., upward in fig. 10).

Therefore, the first baffle 171 and the second baffle 172 can guide the electric auxiliary thermal module 400 to be installed in a state of exposing the communication port 121, thereby improving the convenience of the electric auxiliary thermal module 400 and reducing the difficulty of installation. And can support and limit the electric auxiliary thermal module 400, and improve the installation stability of the electric auxiliary thermal module 400.

Referring to fig. 3, when the first and second baffles 171 and 172 are positioned perpendicular to the fixed plate 120, the length of the first baffle 171 is greater than the length of the second baffle 172 in a direction perpendicular to the fixed plate 120. The dimensional relationship between the first barrier 171 and the second barrier 172 can also be understood as that the length of the first barrier 171 is greater than the length of the second barrier 172 in the height direction of the housing 110 (i.e., up-down direction in fig. 3) when the first barrier 171 and the second barrier 172 are in a position to block the communication port 121.

After the electric auxiliary thermal module 400 is installed, the first baffle 171 and the second baffle 172 are in a state of exposing the communication port 121, and the first baffle 171 and the second baffle 172 are both located on the air duct 130 side. Since the cross-sectional area of the air outlet 310 of the blower 300 is smaller than the cross-sectional area of the air outlet 112, and the air outlet 310 of the blower 300 is formed by the scroll casing, the air flow in the air duct 130 from the air outlet 310 to the air outlet 112 is a divergent air flow. Because the first baffle 171 and the second baffle 172 of the embodiment of the utility model adopt the above dimensional relationship, the through-flow cross-sectional area of the air outlet 310 of the volute, the through-flow cross-sectional area between the first baffle 171 and the housing, the through-flow cross-sectional area between the second baffle 172 and the housing, and the through-flow cross-sectional area of the air outlet 112 are gradually enlarged along the air flow direction of the air duct 130, so that the overall diversion of the air field has a better effect, and the influence on the overall air outlet effect of the air duct 130 is avoided.

Referring to fig. 5 and 7, it can be understood that, in order to ensure the stability of the connection when the first shutter 171 and the second shutter 172 are in the state of blocking the communication port 121, the first shutter 171 is provided with a first connection portion 175, and the second shutter 172 is provided with a second connection portion 176, and the second connection portion 176 is detachably connected with the second connection portion 176. For example, the first connecting portion 175 is an extending edge of the first baffle 171 extending outwards, the second connecting portion 176 is an extending edge of the second baffle 172 extending outwards, and the two extending edges are detachably connected by screws, so that the communication opening 121 can be conveniently exposed and shielded.

Referring to fig. 1, an air handling unit according to an embodiment of the present utility model includes the duct assembly 100 of the above embodiment, and the duct assembly is installed in a fan box. The air handling unit of the present embodiment adopts the air duct assembly 100 of the first aspect, and the air duct assembly 100 is provided with the baffle 170 capable of rotating relative to the fixed plate 120 by arranging the baffle 170 on the fixed plate 120 provided with the communication port 121, and the baffle 170 can expose or shield the communication port 121. When the electric auxiliary thermal module 400 is installed, the baffle 170 can rotate to expose the communication port 121, and the electric auxiliary thermal module 400 penetrates into the air duct 130 through the communication port 121; when the electric auxiliary thermal module 400 is disassembled, the baffle 170 can rotate to shield the communication port 121, so that the air leakage condition of the air duct 130 is reduced, and the air outlet effect of the air treatment unit is improved.

Because the air handling unit adopts all the technical solutions of the air duct assembly 100 in the foregoing embodiments, at least the air handling unit has all the beneficial effects brought by the technical solutions in the foregoing embodiments, and will not be described in detail herein.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (10)

1. The wind channel subassembly, its characterized in that includes:

the shell is provided with an air inlet and an air outlet, and an air channel which is communicated with the air inlet and the air outlet is formed in the shell;

the fixed plate is connected with the shell and is provided with a communication port, and the communication port is communicated with the air duct formed on one side of the fixed plate and the separation cavity formed on the other side of the fixed plate;

the baffle is connected to the fixed plate, and the baffle can rotate relative to the fixed plate so as to expose or shield the communication port.

2. The duct assembly of claim 1, wherein: the air duct assembly further comprises a connecting assembly, and the connecting assembly is respectively connected with the baffle and the fixing plate.

3. The duct assembly of claim 2, wherein: the connecting assembly comprises a fixing buckle and a fixing pin, the fixing pin is rotationally connected in the fixing buckle, the baffle is provided with the fixing pin or one of the fixing buckles, and the fixing plate is provided with the fixing pin and the other one of the fixing buckles.

4. A duct assembly according to claim 3, wherein: the fixed plate is provided with an installation seat, the fixed buckle is connected to the installation seat, and the fixed pin is connected to the baffle and is inserted into the reaming of the fixed buckle.

5. The duct assembly of claim 4, wherein: the mounting seat is provided with a slot, the fixing buckle is provided with an inserting sheet inserted into the slot, and the inserting sheet is connected with the mounting seat through a fastener.

6. The duct assembly of claim 1, wherein: the baffle includes along the air current direction of wind channel interval sets up in proper order first baffle and second baffle, first baffle with the second baffle can rotate in order to shelter from towards the direction in opposite directions the intercommunication mouth.

7. The duct assembly of claim 6, wherein: the first baffle is provided with a first stop part, and the first stop part is used for abutting against the fixed plate when the first baffle is in a position perpendicular to the fixed plate; and/or the second baffle is provided with a second stop part, and the second stop part is used for abutting against the fixed plate when the second baffle is in a position perpendicular to the fixed plate.

8. The duct assembly of claim 6, wherein: when the first baffle plate and the second baffle plate are positioned at the position vertical to the fixed plate, the length of the first baffle plate is longer than that of the second baffle plate in the direction vertical to the fixed plate.

9. The duct assembly of claim 6, wherein: the first baffle is provided with a first connecting portion, the second baffle is provided with a second connecting portion, and the second connecting portion is detachably connected with the second connecting portion.

10. The air treatment unit, its characterized in that: a wind tunnel assembly according to any one of claims 1 to 9.