CN209763443U - air return assembly for air duct machine and air duct machine - Google Patents

Abstract

The utility model discloses a return air subassembly and tuber pipe machine for tuber pipe machine, return air subassembly include return air frame, switch door and drive arrangement, and the return air passageway is limited to the return air frame, and the switch door is established in the air entrance of return air passageway, and the switch door passes through drive arrangement to be installed in the return air frame, and makes the relative return air frame of switch door movable with the air inlet of switch return air passageway. According to the utility model discloses a return air subassembly for tuber pipe machine has promoted interior decoration's associative perception, is convenient for clear up, maintain.

Description

Air return assembly for air duct machine and air duct machine

Technical Field

the utility model belongs to the technical field of the air conditioning technique and specifically relates to a return air subassembly and tuber pipe machine for tuber pipe machine is related to.

Background

In the correlation technique, the tuber pipe machine is generally installed in suspended ceiling, and suspended ceiling needs to set up the air inlet of ventilation hole in order to realize the tuber pipe machine, and ventilation hole department sets up the return air panel, for guaranteeing the normal return air of tuber pipe machine, the return air panel adopts grid formula panel usually to satisfy basic return air function.

However, when the air return panel is installed, the integral sense of interior decoration is damaged, so that higher and higher decoration requirements cannot be met; moreover, the return air panel structure is general, can't satisfy user's differentiation requirement, and the dust between the grid interval is difficult to wash moreover for the maintenance of return air panel is comparatively loaded down with trivial details.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a return air subassembly for tuber pipe machine, the return air subassembly has promoted interior decoration's associative perception, is convenient for clear up, maintain.

The utility model discloses still provide an tuber pipe machine of having above-mentioned return air subassembly.

According to the utility model discloses a return air subassembly for tuber pipe machine of first aspect embodiment, include: the air return frame defines an air return channel; the switch door is arranged at an air inlet of the return air channel; the driving device is used for driving the switch door to move relative to the air return frame so as to switch the air inlet of the air return channel.

According to the utility model discloses a return air subassembly for tuber pipe machine, when guaranteeing the switch door and opening air inlet, under the prerequisite of the normal return air of return air passageway, can shelter from the destruction of return air subassembly to interior decoration when the switch door closes air inlet, promoted interior decoration's associative perception, made things convenient for clearance, the maintenance of return air subassembly simultaneously.

According to some embodiments of the present invention, when the switch door is in a position closing the air inlet, the central plane of the switch door is a preset plane, the driving device includes: the first driver drives the switch door to translate along the direction vertical to the preset plane; and the second driver drives the opening and closing door to rotate around a pivoting piece arranged on the first driver. Therefore, the door can be opened and closed, and the integral sense of interior decoration is ensured.

According to the utility model discloses a some embodiments, first driver drive the switch door is at 0mm ~ h distance within range translation, and wherein, 3mm is less than or equal to h and is less than or equal to 10mm to guarantee the return air volume of return air subassembly, reduced the requirement to first driver.

According to some embodiments of the invention, the first driver comprises: the first gear rack mechanism comprises a first gear condition and a first gear piece, the switch door is hinged to the first gear rack piece through the pivoting piece, the first gear condition is in sliding fit with the air return frame to perform reciprocating translation relative to the air return frame, and the first gear piece is arranged on the air return frame and meshed with the first gear rack piece; and the first motor is directly or indirectly connected with the first gear piece to drive the first gear piece to rotate, and the first gear piece drives the first rack piece to translate in the rotating process. Therefore, the first driver is simple in structure and convenient to implement.

According to the utility model discloses a some embodiments, have on the first tooth condition along the direction of translation slot that the direction of translation of first tooth condition extends, the direction cutting has on the return air frame, the direction cutting is inserted and is joined in marriage in the direction slot, so that first tooth condition is followed the translation of direction cutting to guarantee the stable translation of first rack spare.

According to the utility model discloses a some embodiments, the drive of second driver the switch door is at 0 ~ alpha angular range internal rotation, and wherein, 20 is less than or equal to alpha and is less than or equal to 90 to guaranteed the return air volume of return air subassembly, reduced the requirement to the second driver.

according to some embodiments of the invention, the second driver comprises: the pushing mechanism is arranged between the air return frame and the switch door; and the second motor is connected with the pushing mechanism to drive the pushing mechanism to push the switch door to rotate around the pivoting part. Therefore, the second driver is simple in structure and convenient to implement.

According to some embodiments of the invention, the pushing mechanism comprises: the push rod spare, the push rod spare includes first end and second end, first end with the return air frame is articulated and with the second motor links to each other, the second end with the cooperation of sliding of switch door, second motor drive first end pivoted in-process, the second end is followed the switch door slides in order to promote the switch door winds the pivot spare rotates. Therefore, the arrangement of the pushing mechanism is facilitated, and the reasonable layout is facilitated.

According to some embodiments of the utility model, the push rod piece is the arc pole, the arc pole orientation is kept away from the direction bulge of pivot piece is crooked, first end with the second end does the arc length both ends of push rod piece for the push rod piece is convenient for arrange, the atress is reasonable.

According to some embodiments of the invention, the pushing mechanism comprises: the second gear piece is arranged on the air return frame and is connected with the second motor so as to be driven by the second motor to rotate; and the second gear is meshed with the second gear, the free end of the second gear is matched with the switch door in a sliding manner, the second gear translates relative to the return air frame in the rotating process of the second gear, and the free end slides along the switch door to push the switch door to rotate around the pivoting member. Therefore, the arrangement of the pushing mechanism is facilitated, and the reasonable layout is facilitated.

According to the utility model discloses a some embodiments, the switch door is including a body and side, the side is established on the door body and orientation the direction perpendicular to of return air frame the door body extends, the groove that slides has on the side, the extending direction in groove that slides with the central plane of the door body is parallel, pushing mechanism is in through the cooperation sliding inslot the rolling element with the cooperation is slided to the switch door to reduce pushing mechanism's promotion resistance.

According to the utility model discloses a some embodiments, have on the return air frame and dodge the opening the switch door is in and closes during air inlet's position, the rolling element is located in dodging the opening, guarantee that the switch door rotates smoothly to the position of closing air inlet.

According to the utility model discloses a some embodiments, the switch door is the rectangle, the length both ends of switch door are equipped with one respectively first driver and one the second driver to guaranteed that the switch door motion is steady, reliable.

According to the utility model discloses a some embodiments the switch door is in and closes during the position of air inlet, the return air frame is in orthographic projection on the switch door falls completely in the switch door, so that the return air frame is totally by the switch door shelters from, has further promoted interior decoration's associative perception.

According to the utility model discloses tuber pipe machine of second aspect embodiment, include according to the utility model discloses the return air subassembly that is used for tuber pipe machine of above-mentioned first aspect embodiment.

According to the utility model discloses tuber pipe machine through adopting foretell return air subassembly, has effectively promoted interior decoration's associative perception, has made things convenient for the maintenance of tuber pipe machine.

according to the utility model discloses a some embodiments, the drive arrangement drive the switch door will the in-process that air inlet opened makes air inlet's uncovered orientation with the uncovered orientation of the air outlet of tuber pipe machine is opposite, when guaranteeing that the switch door opens air inlet, return air subassembly still fuses with interior decoration as an organic whole.

Additional aspects and advantages of the invention 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 invention.

Drawings

the above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

Fig. 1 is a schematic view of a return air assembly according to an embodiment of the present invention, wherein the opening and closing door is in a position to open the air inlet;

FIG. 2 is an enlarged view of portion A circled in FIG. 1;

Fig. 3 is a side view of the return air assembly shown in fig. 1;

Fig. 4 is a cross-sectional view of the return air assembly shown in fig. 1;

FIG. 5 is an enlarged view of the portion B circled in FIG. 4;

Fig. 6 is another cross-sectional view of the return air assembly shown in fig. 1;

Fig. 7 is another schematic view of the return air assembly shown in fig. 1 with the switch door in a closed air inlet position;

FIG. 8 is a bottom view of the return air assembly shown in FIG. 7;

Fig. 9 is a front view of the return air assembly shown in fig. 7;

Fig. 10 is a top plan view of the return air assembly shown in fig. 7;

fig. 11 is a side view of the return air assembly shown in fig. 7;

FIG. 12 is an enlarged view of the circled portion C of FIG. 11;

Fig. 13 is a schematic view of a return air assembly according to another embodiment of the present invention, wherein the switching door is in a position to open the air inlet;

Fig. 14 is a schematic view of the door movement of the return air assembly shown in fig. 13;

FIG. 15 is an enlarged view of section D circled in FIG. 14;

Fig. 16 is an installation schematic diagram of a ducted air conditioner according to an embodiment of the present invention.

reference numerals:

An air duct machine 200, an air outlet 101,

A return air component 100, a preset plane 100a, a central plane 100b of a return air frame,

An air return frame 1, an air return channel 10, an air inlet 10a,

a guide cutting 11, an avoiding opening 12, a notch 13,

The opening and closing door 2, the pivoting piece 20, the door body 21, the side 22, the sliding groove 221,

A drive device 3, a first driver 31, a second driver 32,

a first gear rack mechanism 311, a first motor 312, a pushing mechanism 321, a second motor 322,

A first rack member 3111, a guide slot 3111a, a first gear member 3112,

A rolling body 3210, a push rod member 3211, a first end 3211a, a second end 3211b, an arc-shaped rod 3211c,

a second gear member 3212, a second gear member 3213, a free end 3213a,

detection module 4, electronic control module 5, filter screen 6.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A return air assembly 100 for a duct machine 200 according to an embodiment of the present invention is described below with reference to the drawings. The duct type air conditioner 200 is an air duct type air conditioner.

as shown in fig. 1 and 4, a return air assembly 100 for a duct machine 200 according to an embodiment of the present invention includes a return air frame 1, a switch door 2, and a driving device 3.

the return air frame 1 defines a return air channel 10, the return air channel 10 has an air inlet 10a, the switching door 2 is provided at the air inlet 10a of the return air channel 10, the switching door 2 is mounted to the return air frame 1 by the driving device 3, and the driving device 3 makes the switching door 2 movable relative to the return air frame 1 to switch the air inlet 10a of the return air channel 10.

Drive arrangement 3 can install in return air frame 1, and drive arrangement 3 links to each other with switch door 2 for switch door 2 can be installed in return air frame 1 through drive arrangement 3 is indirect, and drive arrangement 3 drive switch door 2 motion simultaneously makes switch door 2 can open air inlet 10a, also can close air inlet 10 a. When the opening and closing door 2 opens the air inlet 10a, the return air passage 10 can communicate with the external environment through the air inlet 10 a; when the opening and closing door 2 closes the air inlet 10a, the opening and closing door 2 may shield the air inlet 10 a.

When the return air assembly 100 is used in the duct unit 200, the return air assembly 100 may be installed on a ceiling, a wall, or the like. When the air duct machine 200 operates, the driving device 3 can drive the switch door 2 to move so as to open the air inlet 10a, air can flow into the return air channel 10 through the air inlet 10a and is finally blown out from the air outlet 101 of the air duct machine 200, and normal air outlet of the air duct machine 200 is realized; when the ducted air conditioner 200 stops operating, the driving device 3 can drive the switch door 2 to move so as to close the air inlet 10a, at this time, the switch door 2 can shield the air inlet 10a, so as to prevent foreign matters such as dust from entering the air return channel 10 and affecting the air return of the air return component 100, compared with the grid type structure in the prior art, the air return component 100 in the application is convenient to clean and maintain, the switch door 2 can at least partially shield the damage of the return air assembly 100 to the indoor decoration, such as a ceiling or a wall, and the like, thereby being convenient for hiding the return air assembly 100 from the indoor decoration, avoiding the indoor decoration from generating a sharp feeling to damage the integrity of the indoor decoration, thereby make return air subassembly 100 and suspended ceiling or wall form a smooth whole, return air subassembly 100 fuses well with the interior decoration style as an organic whole, has promoted interior decoration's associative perception, and then can satisfy higher fitment and aesthetic requirement better.

It is understood that when the return air assembly 100 is applied to the duct unit 200, the air inlet 10a may be formed as an air inlet of the duct unit 200, or may be formed between the air inlet and the air outlet of the duct unit 200. The number of the opening and closing doors 2 can be one or more; for example, in the example of fig. 1 and 13, the number of the switching doors 2 is two.

According to the utility model discloses a return air subassembly 100 for tuber pipe machine 200, locate to set up movable switch door 2 with switch air inlet 10a through the air inlet 10a at return air passageway 10, thereby when guaranteeing switch door 2 to open air inlet 10a, under the prerequisite of the normal return air of return air passageway 10, switch door 2 can shelter from return air subassembly 100 to the destruction of interior decoration when closing air inlet 10a, the monolithic of interior decoration has been promoted, the clearance of return air subassembly 100 has been made things convenient for simultaneously, the maintenance.

In some embodiments of the present invention, when the switch door 2 is in the position of closing the air inlet 10a, the central plane of the switch door 2 is the preset plane 100a, the driving device 3 includes a first driver 31 and a second driver 32, the first driver 31 drives the switch door 2 to translate along the direction perpendicular to the preset plane 100a, and the second driver 32 drives the switch door 2 to rotate around the pivot 20 provided on the first driver 31. For example, as shown in fig. 1, 4 and 5, a first driver 31 and a second driver 32 may be respectively mounted on the return air frame 1, the first driver 31 and the switching door 2 may be connected through the pivot member 20 to drive the switching door 2 to make reciprocating translation, and the first driver 31 is pivotally connected to the switching door 2, so that the switching door 2 rotates around the pivot member 20 under the driving action of the second driver 32, thereby realizing the movement of the switching door 2 relative to the return air frame 1, and ensuring that the switching door 2 can open and close the air inlet 10 a; meanwhile, the switch door 2 can move horizontally relative to the air return frame 1, so that the switch door 2 can rotate flexibly, the switch door 2 can shield the outer edge of the air return frame 1 when the switch door 2 is in the position for opening the air inlet 10a, and the integral sense of indoor decoration is further guaranteed.

The preset plane 100a may be a central plane in the thickness direction of the opening/closing door 2. The pivoting member 20 can be a pivoting hole and also can be a pivoting shaft; when the pivot member 20 of the first driver 31 is a pivot hole, the first driver 31 may be hinged to the opening/closing door 2 by a pivot shaft, which may be provided on the opening/closing door 2, or the pivot shaft may be formed as a separate component from the first driver 31 and the opening/closing door 2, and when the pivot member 20 of the first driver 31 is a pivot shaft, a pivot hole may be formed on the opening/closing door 2 to cooperate with the pivot shaft, so as to realize the hinge connection of the first driver 31 to the opening/closing door 2.

It should be noted that the first driver 31 drives the opening and closing door 2 to translate, and it is understood that the first driver 31 drives a part of the opening and closing door 2 to translate; the process of the first driver 31 driving the opening and closing door 2 to translate may not be in sequence with the process of the second driver 32 driving the opening and closing door 2 to rotate, for example, the opening and closing door 2 may translate first and then rotate, or the opening and closing door 2 may rotate first and then translate, or the opening and closing door 2 may translate and rotate simultaneously during the process of the opening and closing door 2 moving from the position of closing the air inlet 10a to the position of opening the air inlet 10a, but is not limited thereto.

It will be understood that the translational direction of the first actuator 31 for driving the opening and closing door 2 may also be not perpendicular to the preset plane 100a, for example, the translational direction of the first actuator 31 for driving the opening and closing door 2 may be an acute angle with the preset plane 100 a. The movement of the opening/closing door 2 may be other manners, but is not limited thereto, and it is only necessary to ensure that the opening/closing door 2 can open/close the air inlet 10 a.

Alternatively, as shown in fig. 4, 5 and 16, the first driver 31 drives the opening and closing door 2 to translate within a distance range of 0 mm-h (inclusive), specifically, the opening and closing door 2 may have a first position and a second position, and the opening and closing door 2 moves between the first position and the second position to open and close the air inlet 10 a; when the switch door 2 is at the first position, the switch door 2 closes the air inlet 10a, and the distance that the first driver 31 drives the switch door 2 to translate is 0mm, and when the switch door 2 is at the second position, the switch door 2 is at the extreme position of opening the air inlet 10a, and the distance that the first driver 31 drives the switch door 2 to translate is h, and then h can be understood as the maximum translation distance of the switch door 2 in the direction perpendicular to the preset plane 100 a.

wherein, h satisfies that h is less than or equal to 10mm more than or equal to 3mm for have suitable clearance when opening switch door 2 and opening air inlet 10a between with air inlet 10a, thereby the amount of wind of air inlet 10a department has been guaranteed, avoid reducing between switch door 2 and the air inlet 10a undersize and influence the return air volume of return air subassembly 100, avoided simultaneously when opening switch door 2 and opening air inlet 10a when too big and the requirement of first driver 31 of clearance between the air inlet 10a is higher, thereby the occupation space of first driver 31 has been saved, the cost of first driver 31 has been reduced, make return air subassembly 100 have good practicality. Alternatively, h may be 3mm, or 5mm, or 8mm, or 10mm, etc.

It is understood that when the return air assembly 100 is applied to the duct machine 200 and the return air assembly 100 is installed on the ceiling, the first driver 31 can drive the switch door 2 to translate in the vertical direction, and the switch door 2 translates for a short distance to open the air inlet 10a, so as to facilitate the quick switching of the position of the switch door 2.

Specifically, as shown in fig. 1, 4 and 5, the first driver 31 includes a first rack-and-pinion mechanism 311 and a first motor 312, the first rack-and-pinion mechanism 311 includes a first rack 3111 and a first gear 3112, the first gear 3112 is disposed on the air return frame 1, the first gear 3112 is engaged with the first rack 3111, the switch door 2 is hinged to the first rack 3111, the first rack 3111 is slidably engaged with the air return frame 1 to reciprocally translate relative to the air return frame 1, a sliding direction of the first rack 3111 is perpendicular to the preset plane 100a, the first motor 312 is directly or indirectly connected to the first gear 3112 to drive the first gear 3112 to rotate, and the first gear 3111 is driven to translate during rotation of the first gear 3112 to drive the switch door 2 to translate. Therefore, the first driver 31 has a simple structure and is convenient to realize, and the stability of the translation of the opening and closing door 2 is ensured.

The first motor 312 may be directly connected to the first gear piece 3112 to drive the first gear piece 3112 to rotate, and at this time, the first driver 31 directly drives the first gear piece 3112 to rotate by using the first motor 312; alternatively, the first motor 312 may be indirectly connected to the first gear member 3112 to drive the first gear member 3112 to rotate, and at this time, the first driver 31 may drive the first gear member 3112 to rotate by combining the first motor 312 with a transmission mechanism, which may be a gear transmission mechanism, a belt transmission mechanism, or the like.

It will be appreciated that the first driver 31 may also be formed in other configurations to effect reciprocal translation of the switching door 2, and is not limited to the first motor 312 and the first rack and pinion mechanism 311. For example, the first driver 31 may include a driving motor and a ball screw mechanism, and the ball screw mechanism may include a screw and a nut that are fitted to each other; the driving motor directly or indirectly drives the screw rod to rotate so as to drive the nut to perform reciprocating translation, the nut is connected with the switch door 2 so as to perform reciprocating translation of the switch door 2, or the driving motor directly or indirectly drives the nut to rotate so as to drive the screw rod to perform reciprocating translation, and the screw rod is connected with the switch door 2 so as to perform reciprocating translation of the switch door 2.

For example, as shown in fig. 5, the first rack member 3111 has a guide slot 3111a extending in the translation direction of the first rack member 3111, the return air frame 1 has a guide slip 11, the guide slip 11 is inserted into the guide slot 3111a, and the guide slip 11 is slidable in the guide slot 3111a with respect to the guide slot 3111a to translate the first rack member 3111 along the guide slip 11. From this, through the direction cutting 11 and the direction slot 3111a that cooperate each other, be convenient for realize first rack 3111 spacing, guarantee first rack 3111's translation, can play the guide effect to first rack 3111's translation simultaneously, guarantee the stability of first rack 3111 translation to switch door 2 has been guaranteed and has moved steadily.

In the example of fig. 5, the guide slot 3111a may penetrate through at least one axial end of the first rack member 3111, and the guide strip 11 is inserted into the guide slot 3111a from the axial end of the first rack member 3111, so that the first rack member 3111 is sleeved outside the guide strip 11, and the guide slot 3111a is simple in structure and convenient to process.

It is to be understood that the structure of the guide slot 3111a is not limited thereto; for example, the guide slot 3111a may also penetrate through a peripheral wall of the first rack member 3111, and may also cooperate with the guide slip 11 to guide the movement of the first rack member 3111.

Of course, the guide slot 3111a may also be formed on the air return frame 1, the guide slip 11 may be disposed on the first rack 3111, and the guide slip 11 is inserted into the guide slot 3111a, and may also play a role in guiding, so that the first rack 3111 translates along the guide slot 3111a, thereby ensuring stability of the first rack 3111 during the translation process.

Alternatively, as shown in fig. 4, 5 and 16, the second driver 32 drives the switching door 2 to rotate within an angle range of 0 ° to α (inclusive), specifically, the switching door 2 may have a first position and a second position, and the switching door 2 moves between the first position and the second position to switch the air inlet 10 a; when the switch door 2 is at the first position, the switch door 2 closes the air inlet 10a, at this time, the rotation angle of the switch door 2 is 0 °, when the switch door 2 is at the second position, the switch door 2 is at the limit position for opening the air inlet 10a, at this time, the rotation angle of the switch door 2 is α, and then α can be understood as the maximum rotation angle of the switch door 2.

Wherein, alpha satisfies that alpha is no less than 20 and is no more than 90 for the maximum turned angle of switch door 2 is reasonable, has guaranteed the amount of wind of air inlet 10a department, has avoided the maximum turned angle undersize of switch door 2 to influence the return air volume of return air subassembly 100, and has avoided the too big requirement that leads to second driver 32 of the maximum turned angle of switch door 2 to be higher, thereby has made things convenient for second driver 32's setting, reduce cost. Alternatively, α may be 20 °, or 30 °, or 45 °, or 65 °, or 90 °, etc.

In some embodiments of the present invention, as shown in fig. 2, fig. 4 and fig. 15, the second driver 32 includes a pushing mechanism 321 and a second motor 322, the pushing mechanism 321 is disposed between the air return frame 1 and the switch door 2, the pushing mechanism 321 can be respectively matched with the air return frame 1 and the switch door 2, the second motor 322 is connected to the pushing mechanism 321 to drive the pushing mechanism 321 to push the switch door 2 to rotate around the pivot 20, that is, during the movement of the pushing mechanism 321 driven by the second motor 322, the pushing mechanism 321 pushes the switch door 2 to rotate around the pivot 20. Thus, the second driver 32 has a simple structure and is easy to implement.

In some optional embodiments of the present invention, as shown in fig. 2 to 4, the pushing mechanism 321 includes a push rod member 3211, the push rod member 3211 includes a first end 3211a and a second end 3211b, the first end 3211a and the second end 3211b may be disposed oppositely along a length direction of the push rod member 3211, the first end 3211a is hinged to the air return frame 1 and the first end 3211a is connected to the second motor 322 to be driven by the second motor 322 to rotate, so that the second motor 322 may drive the push rod member 3211 to rotate around the first end 3211a relative to the air return frame 1, and the second end 3211b is slidably engaged with the switch door 2; here, the hinge position of the first end 3211a and the return air frame 1 may be offset from the pivot member 20 such that the rotation axis of the first end 3211a does not coincide with the central axis of the pivot member 20.

In the process that the second motor 322 drives the first end 3211a to rotate, the second end 3211b rotates around the first end 3211a to slide along the switch door 2 to push the switch door 2 to rotate around the pivot 20, thereby realizing smooth rotation of the switch door 2, and meanwhile, because the second end 3211b is in sliding fit with the switch door 2, the arrangement of the hinge position of the first end 3211a and the return air frame 1 has good flexibility, thereby avoiding the problem that the second end 3211b cannot push the switch door 2 to rotate due to the misalignment of the rotation axis of the push rod 3211 (i.e., the rotation axis of the first end 3211 a) and the rotation axis of the switch door 2 (i.e., the central axis of the pivot 20), further facilitating the arrangement of the pushing mechanism 321, and facilitating the realization of reasonable layout of the return air assembly 100.

the first end 3211a is connected to the second motor 322, which can be understood as that the first end 3211a is directly or indirectly connected to the second motor 322, so that the second motor 322 can drive the first end 3211a to rotate; for example, the second motor 322 may be directly engaged with the first end 3211a to drive the first end 3211a to rotate, and at this time, the second driver 32 directly drives the push rod member 3211 to rotate by using the second motor 322; for another example, the second motor 322 may be indirectly engaged with the first end 3211a to drive the first end 3211a to rotate, and at this time, the second driver 32 may drive the push rod member 3211 to rotate by combining the second motor 322 with a transmission mechanism, where the transmission mechanism may be a gear transmission structure, a belt transmission mechanism, or the like.

Optionally, the push rod member 3211 is an arc-shaped rod 3211c, an axis (or center line) of the arc-shaped rod 3211c is an arc line, and the first end 3211a and the second end 3211b are two ends of the arc length of the push rod member 3211. For example, in the example of fig. 4, the first end 3211a and the second end 3211b are circumferential two ends of the push rod member 3211, and during the process that the second end 3211b pushes the switch door 2 to rotate around the pivot member 20, the second end 3211b receives a reaction force F applied by the switch door 2, and since the axis of the arc-shaped rod 3211c is an arc line, an included angle between a direction of the reaction force F and an extending direction of the arc line is conveniently reduced, so that the arc-shaped rod 3211c mainly bears an axial load, and thus the arc-shaped rod 3211c is reasonably stressed, has good load bearing capability, and ensures the use reliability of the push rod member 3211.

Wherein, the arc pole 3211c is towards the direction bulge bending of keeping away from pivot 20, can understand, in the in-process that arc pole 3211c pushed switch door 2 and opened air inlet 10a, arc pole 3211c is towards the curved member of direction bulge bending of keeping away from pivot 20 to when switch door 2 was located the position of closing air inlet 10a, avoid taking place to interfere between arc pole 3211c and the switch door 2, guaranteed that switch door 2 closes air inlet 10a smoothly, made things convenient for the arrangement of arc pole 3211c simultaneously.

It is understood that the axis of the pusher member 3211 may also be formed as a straight line, or other curved lines, which also allows for smooth rotation of the switch door 2 and facilitates a versatile design of the pusher member 3211.

In other optional embodiments of the utility model, as shown in fig. 14 and 15, the pushing mechanism 321 includes a second gear 3212 and a second gear 3213, the second gear 3212 is disposed on the air return frame 1, and the second gear 3212 is connected to the second motor 322 to be driven by the second motor 322 to rotate, the second gear 3213 is engaged with the second gear 3212, and the free end 3213a of the second gear 3213 is slidably engaged with the switch door 2, then the second gear 3213 can not extend from one side of the switch door 2 to the other side of the switch door 2, so that the switch door 2 can effectively shield the pushing mechanism 321, and further ensure the integral sense of interior decoration.

In the process that the second motor 322 drives the second gear member 3212 to rotate, the second tooth condition 3213 translates relative to the return air frame 1, the free end 3213a translates to slide along the switch door 2 to push the switch door 2 to rotate around the pivot member 20, smooth rotation of the switch door 2 is realized, and meanwhile, the free end 3213a of the second tooth condition 3213 is in sliding fit with the switch door 2, so that the position setting of the second tooth condition 3213 has good flexibility, the arrangement of the pushing mechanism 321 is facilitated, and the reasonable layout of the return air assembly 100 is facilitated.

The second gear member 3212 is connected to the second motor 322, and it is understood that the second gear member 3212 is directly or indirectly connected to the second motor 322 to be driven by the second motor 322 to rotate; for example, the second motor 322 may be connected to the second gear member 3212 to drive the second gear member 3212 to rotate, and at this time, the second driver 32 drives the second gear member 3212 to rotate in a direct-drive manner of the second motor 322; for another example, the second motor 322 may be indirectly connected to the second gear 3212 to drive the second gear 3212 to rotate, and at this time, the second driver 32 may drive the second gear 3212 to rotate by combining the second motor 322 with a transmission mechanism, where the transmission mechanism may be a gear transmission mechanism, a belt transmission mechanism, or the like.

It will be appreciated that when the first actuator 31 drives the switching door 2 to translate, the pivoting member 20 may follow the switching door 2 to translate synchronously, and at this time, the translation of the second toothed member 3213 may not be synchronized with the translation of the pivoting member 20, so as to realize the rotation of the switching door 2 about the pivoting member 20.

Specifically, the opening and closing door 2 includes a door body 21 and a side 22, the side 22 is disposed on the door body 21, the side 22 extends perpendicular to the door body 21 toward the direction of the air return frame 1, a sliding groove 221 is disposed on the side 22, the extending direction of the sliding groove 221 is parallel to the central plane of the door body 21, and the pushing mechanism 321 is in sliding fit with the opening and closing door 2 through a rolling body 3210 fitted in the sliding groove 221. For example, as shown in fig. 1, 2 and 15, the door body 21 may be formed substantially in a plate-like structure, the side 22 may be disposed on a side of the door body 21 close to the central plane 100b of the return frame and the side 22 extends toward a direction close to the central plane 100b of the return frame, the extending direction of the side 22 is perpendicular to the door body 21, and the side 22 is formed substantially in a plate-like structure; the rolling element 3210 cooperates in the sliding groove 221 and the rolling element 3210 can slide in the sliding groove 221 relative to the sliding groove 221, also can rotate around the central axis of the rolling element 3210, the rolling contact of the rolling element 3210 and the side 22 is realized, when the pushing mechanism 321 pushes the switch door 2 to rotate, the friction force between the pushing mechanism 321 and the switch door 2 is reduced, thereby reducing the pushing resistance of the pushing mechanism 321, further ensuring the smooth rotation of the switch door 2, saving the energy consumption of the second motor 322, and reducing the use cost of the return air assembly 100.

wherein, the central plane 100b of the air return frame can pass through the center of the air return frame 1 and the central plane 100b of the air return frame is parallel to the preset plane 100 a. The "extending direction of the sliding groove 221 is parallel to the central plane of the door 21" may be broadly understood, and the extending direction of the sliding groove 221 is parallel to the central plane of the door 21, and may include the extending direction of the sliding groove 221 being substantially parallel to the central plane of the door 21.

For example, in the example of fig. 2 and 4, the pushing mechanism 321 includes a push rod member 3211, the push rod member 3211 includes a first end 3211a and a second end 3211b, the first end 3211a is hinged to the air return frame 1 and the first end 3211a is connected to the second motor 322 to be driven by the second motor 322 to rotate, and the second end 3211b is slidably engaged with the switch door 2 through a rolling body 3210 engaged in the sliding groove 221; during the rotation of the first end 3211a driven by the second motor 322, the second end 3211b rotates around the first end 3211a to slide along the switch door 2, so as to push the switch door 2 to rotate around the pivot 20.

For another example, in the example of fig. 14 and 15, the pushing mechanism 321 includes a second gear 3212 and a second gear 3213, the second gear 3212 is disposed on the air return frame 1, the second gear 3212 is connected to the second motor 322 to be driven by the second motor 322 to rotate, the second gear 3213 is engaged with the second gear 3212, and a free end 3213a of the second gear 3213 is slidably fitted to the switch door 2 through a rolling element 3210 fitted in the sliding groove 221; during the process that the second motor 322 drives the second gear member 3212 to rotate, the second gear member 3213 translates relative to the air return frame 1, and the free end 3213a translates to slide along the switch door 2 to push the switch door 2 to rotate around the pivot member 20.

furthermore, the air return frame 1 is provided with an avoiding opening 12, when the switch door 2 is located at a position for closing the air inlet 10a, the rolling body 3210 is located in the avoiding opening 12, so that the interference between the rolling body 3210 and the air return frame 1 is avoided, the smooth closing of the air inlet 10a by the switch door 2 is ensured to shield the air inlet 10a, and foreign matters such as dust and the like are prevented from entering the air return channel 10 to influence the air return of the air return assembly 100. For example, in the example of fig. 2 and 12, the side 22 may be disposed adjacent to the end of the door body 21, the escape opening 12 may be formed on the side wall of the return air frame 1, and the escape opening 12 may be recessed toward a direction away from the opening and closing door 2, and the rolling body 3210 may include a first section that fits in the sliding groove 221 and a second section that protrudes out of the sliding groove 221; when the switch door 2 closes the air inlet 10a, the second section can be accommodated in the avoiding opening 12, so that interference between the second section and the air return frame 1 is avoided, and the switch door 2 is ensured to smoothly rotate to the position for closing the air inlet 10 a.

alternatively, the length of the escape opening 12 may be greater than or equal to the extension length of the sliding groove 221.

In some embodiments of the present invention, the switch door 2 is rectangular, and the length of the switch door 2 is provided with a first driver 31 and a second driver 32 at both ends. For example, as shown in fig. 1, the air inlet 10a may be formed in a rectangular shape to match the shape of the opening/closing door 2, and the rotation axis of the opening/closing door 2 may be provided at one end in the width direction of the opening/closing door 2, so that the rotation distance of the other end in the width direction of the opening/closing door 2 is smaller when the rotation angles are the same during the rotation of the opening/closing door 2, or the rotation angle of the opening/closing door 2 is larger when the rotation distances of the other end in the width direction of the opening/closing door 2 are the same to ensure the air volume of the air inlet 10 a; the length one end of switch door 2 is equipped with a first driver 31 and a second driver 32, the length other end of switch door 2 also is equipped with a first driver 31 and a second driver 32, then two first drivers 31 at 2 length both ends of switch door can the synchronous operation in order to drive switch door 2 translation, two second drivers 32 at 2 length both ends of switch door can the synchronous operation in order to drive switch door 2 rotation, thereby the stability and the pivoted stability of 2 translations of switch door have been guaranteed, make switch door 2 motion steady, reliable.

it will be appreciated that the switching door 2 may also be formed in other shapes, such as square, trapezoidal, etc. The number and arrangement of the first driver 31 and the second driver 32 are not limited thereto; for example, when the switch door 2 is formed in a rectangular shape, two ends of the length of the switch door 2 may be respectively provided with a first driver 31, one end of the switch door 2 in the length direction may be provided with a second driver 32, and the other end is not provided with the second driver 32; for example, when the opening/closing door 2 is formed in a rectangular shape, the number of the first actuators 31 may be three or more, and a plurality of the first actuators 31 may be provided at intervals in the longitudinal direction of the opening/closing door 2.

The utility model discloses an in some embodiments, when switch door 2 is in the position of closing air inlet 10a, the orthographic projection of return air frame 1 on switch door 2 falls completely in switch door 2, so that return air frame 1 is sheltered from by switch door 2 completely, then when switch door 2 is in the position of closing air inlet 10a, the outward flange of the orthographic projection of return air frame 1 on switch door 2 is located the inboard of the outward flange of switch door 2, switch door 2 can shelter from return air frame 1 completely this moment, make switch door 2 effectively shelter from the destruction of return air subassembly 100 to the interior decoration global sense, the global sense of interior decoration has further been promoted.

It can be understood that when the switch door 2 is in the position for closing the air inlet 10a, the orthographic projection of the return air frame 1 on the switch door 2 can also be at least partially located outside the outer edge of the switch door 2, or the orthographic projection of the return air frame 1 on the switch door 2 falls on the outer edge of the switch door 2, which can also make the switch door 2 shield the return air assembly 100 from damaging the overall sense of interior decoration, and ensure the overall sense of interior decoration.

According to the present invention, the duct machine 200 according to the second aspect of the present invention includes the return air assembly 100 for the duct machine 200 according to the first aspect of the present invention. The duct unit 200 may be installed on a ceiling of a room, but is not limited thereto.

According to the utility model discloses tuber pipe machine 200, through adopting foretell return air subassembly 100, effectively promoted interior decoration's associative perception, made things convenient for tuber pipe machine 200's maintenance.

In some embodiments of the present invention, the driving device 3 drives the switch door 2 to open the air inlet 10a, so that the open direction of the air inlet 10a is opposite to the open direction of the air outlet 101 of the duct machine 200. For example, in the example of fig. 16, the duct unit 200 may be mounted to a ceiling, the outlet ports 101 may be provided at intervals on the left side of the air inlet 10a, and the rotation axis of the switching door 2 may be provided on the side of the air inlet 10a adjacent to the outlet ports 101; in-process that air inlet 10a was opened to switch door 2, switch door 2 can clockwise rotation, the uncovered orientation of air inlet 10a can roughly be right this moment, the uncovered orientation of the air outlet 101 of tuber pipe machine 200 can roughly be left, and user's active area is the air-out side of tuber pipe machine 200, then user's active area can be the left side below of air outlet 101, even the user raises the head and looks over return air subassembly 100 this moment, because the sheltering from of switch door 2, be used for still can't directly see return air frame 1, further guaranteed return air subassembly 100 and interior decoration integration, thereby effectively guaranteed interior decoration's associative perception.

It should be noted that "opposite" in the above description is not strictly opposite, but means that the general orientation of the opening of the air inlet 10a is opposite to the general orientation of the opening of the air outlet 101; also, the structure of the duct machine 200 shown in fig. 16 is exemplary only for explanation, and not to be construed as a limitation of the present invention.

Other constructions and operations of the ducted air conditioner 200 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

The return air assembly 100 and the duct unit 200 for the duct unit 200 according to the embodiment of the present invention will be described in detail below in two specific embodiments with reference to the accompanying drawings. It is to be understood that the following description is illustrative only and is not intended as a specific limitation on the invention.

Example one

In the present embodiment, as shown in fig. 1, 6 and 10, the air return assembly 100 includes an air return frame 1, a switching door 2 and a driving device 3, a detection module 4, an electronic control module 5 and a filter screen 6.

The air return frame 1 is roughly formed into the cuboid structure, and the air return channel 10 is injectd to air return frame 1, and air return channel 10 has air inlet 10a, and detection module 4 and switch door 2 all establish in air inlet 10a department, and detection module 4 can be used for detecting indoor temperature, user's position etc. and automatically controlled module 5 installs in air return frame 1, and filter screen 6 establishes in order to filter the air current that flows in air return channel 10.

the number of the switch doors 2 is two, the two switch doors 2 are sequentially arranged along the front-back direction, and each switch door 2 is respectively formed into a rectangle; each opening and closing door 2 comprises a door body 21 and a side edge 22, wherein the side edge 22 is arranged on the door body 21, the side edge 22 extends perpendicular to the door body 21 in the direction towards the air return frame 1, a sliding groove 221 is formed in the side edge 22, the extending direction of the sliding groove 221 is parallel to the central plane of the door body 21, and a rolling body 3210 is arranged in the sliding groove 211. The return air frame 1 is formed with a notch 13, the side wall of the return air frame 1 is formed with an avoidance opening 12, the avoidance opening 12 is communicated with the notch 13, and when the opening/closing door 2 is at a position to close the air inlet 10a, the rolling body 3210 is accommodated in the avoidance opening 12 through the notch 13.

The driving device 3 is installed on the air return frame 1, each switch door 2 is respectively installed on the air return frame 1 through the driving device 3, and the driving device 3 drives the switch door 2 to move relative to the air return frame 1 to switch the air inlet 10 a.

Specifically, as shown in fig. 1, the driving device 3 includes a first driver 31 and a second driver 32, each of the two ends of the length direction (for example, the left-right direction in fig. 1) of the opening/closing door 2 is provided with one first driver 31 and one second driver 32, respectively, the first driver 31 drives the opening/closing door 2 to translate in the direction perpendicular to the preset plane 100a, and the first driver 31 drives the opening/closing door 2 to translate within a distance range of 0mm to h (inclusive), the second driver 32 drives the opening/closing door 2 to rotate around a pivot member 20 provided on the first driver 31, the pivot member 20 is provided on one side (for example, the front side in fig. 1) corresponding to the width direction of the opening/closing door 2, and the second driver 32 drives the opening/closing door 2 to rotate within an angle range of 0 ° to α (inclusive). Wherein, when the switch door 2 is at the position of closing the air inlet 10a, the central plane of the switch door 2 is a preset plane 100a, h and alpha respectively satisfy 3 mm-h-10 mm and 20-alpha-90 deg.

The first driver 31 includes a first rack and pinion mechanism 311 and a first motor 312, the first rack and pinion mechanism 311 includes a first rack member 3111 and a first gear member 3112, the first gear member 3112 is provided on the return air frame 1 and the first gear member 3112 is engaged with the first rack member 3111, and the pivot member 20 is provided at a free end of the first rack member 3111 such that the first rack member 3111 is hinged with the opening and closing door 2; the first rack member 3111 and the return air frame 1 are slidably engaged through the guide slot 3111a and the guide insert 11 engaged with each other to be reciprocally translated with respect to the return air frame 1 perpendicular to the preset plane 100 a. The first motor 312 is directly connected to the first gear 3112 to drive the first gear 3112 to rotate, and the first gear 3112 drives the first rack 3111 to translate to drive the switch door 2 to translate during the rotation process of the first gear 3112. The first motor 312 is a stepping motor.

The second driver 32 includes a pushing mechanism 321 and a second motor 322, the pushing mechanism 321 is disposed between the air return frame 1 and the switch door 2, and the second motor 322 is connected to the pushing mechanism 321 to drive the pushing mechanism 321 to push the switch door 2 to rotate around the pivot 20. Wherein the second motor 322 is a stepper motor.

The pushing member 321 includes a push rod member 3211, the push rod member 3211 is an arc-shaped rod 3211c, the arc-shaped rod 3211c is convexly curved toward a direction away from the pivot member 20, and two ends of an arc length of the push rod member 3211 are a first end 3211a and a second end 3211b, respectively, the first end 3211a is offset from the pivot member 20, the first end 3211a is hinged to the return air frame 1, the first end 3211a is connected to the second motor 322 to be driven by the second motor 322 to rotate, so that the second motor 322 can drive the push rod member 3211 to rotate around the first end 3211a relative to the return air frame 1, and the second end 3211b is slidably engaged with the switch door 2 through a rolling element 3210. During the process that the second motor 322 drives the first end 3211a to rotate, the second end 3211b rotates around the first end 3211a to slide along the switch door 2 so as to push the switch door 2 to rotate around the pivot 20.

According to the utility model discloses return air subassembly 100 has realized the normal return air of return air subassembly 100, and switch door 2 can shelter from return air subassembly 100 to interior decoration's destruction, has promoted interior decoration's whole aesthetic feeling, has made things convenient for clearance, the maintenance of return air subassembly 100 simultaneously.

As shown in fig. 16, the air duct machine 200 includes the return air assembly 100, and the return air assembly 100 is the return air assembly 100 shown in fig. 1, wherein the air inlet 10a is formed as an air inlet of the air duct machine 200, a user can repair and maintain the air duct machine 200 through the air inlet 10a, and the second driver 32 drives the switch door 2 to open the air inlet 10a, so that the opening of the air inlet 10a faces the opposite direction to the opening of the air outlet 101 of the air duct machine 200.

According to the utility model discloses tuber pipe machine 200, through adopting foretell return air subassembly 100, effectively promoted interior decoration's associative perception, made things convenient for tuber pipe machine 200's maintenance.

Example two

As shown in fig. 13 to 15, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the pushing mechanism 321 is different in structure.

specifically, as shown in fig. 14 and 15, the pushing mechanism 321 includes a second gear 3212 and a second gear 3213, the second gear 3212 is disposed on the air return frame 1, the second gear 3212 is connected to the second motor 322 to be driven by the second motor 322 to rotate, the second gear 3213 is engaged with the second gear 3212, and a free end 3213a of the second gear 3213 is slidably engaged with the switching door 2 through a rolling element 3210. During the process that the second motor 322 drives the second gear member 3212 to rotate, the second gear member 3213 translates relative to the air return frame 1, and the free end 3213a slides along the switch door 2 to push the switch door 2 to rotate around the pivot member 20.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (16)

1. A return air assembly for a ducted air conditioner, comprising:

The air return frame defines an air return channel;

The switch door is arranged at an air inlet of the return air channel;

The driving device is used for driving the switch door to move relative to the air return frame so as to switch the air inlet of the air return channel.

2. The return air assembly for a duct unit according to claim 1, wherein a center plane of the opening/closing door is a predetermined plane when the opening/closing door is in a position to close the air inlet, and the driving device includes:

The first driver drives the switch door to translate along the direction vertical to the preset plane;

And the second driver drives the opening and closing door to rotate around a pivoting piece arranged on the first driver.

3. The return air assembly for the duct unit as claimed in claim 2, wherein the first driver drives the opening and closing door to move in a horizontal direction within a distance range of 0mm to h, wherein h is greater than or equal to 3mm and less than or equal to 10 mm.

4. the return air assembly for a duct machine as set forth in claim 2, wherein said first drive includes:

The first gear rack mechanism comprises a first gear condition and a first gear piece, the switch door is hinged to the first gear rack piece through the pivoting piece, the first gear condition is in sliding fit with the air return frame to perform reciprocating translation relative to the air return frame, and the first gear piece is arranged on the air return frame and meshed with the first gear rack piece; and

The first motor is directly or indirectly connected with the first gear piece to drive the first gear piece to rotate, and the first gear piece drives the first rack piece to translate in the rotating process.

5. The return air assembly for a duct unit according to claim 4, wherein the first rack member has a guide slot extending in a direction of translation of the first rack member, and the return frame has a guide slip inserted and fitted into the guide slot so that the first rack member translates along the guide slip.

6. The return air assembly for a duct unit as claimed in claim 2, wherein said second actuator drives said opening and closing door to rotate within an angular range of 0 ° to α, wherein α is 20 ° to 90 °.

7. The return air assembly for a duct machine as set forth in claim 2, wherein said second drive includes:

the pushing mechanism is arranged between the air return frame and the switch door;

And the second motor is connected with the pushing mechanism to drive the pushing mechanism to push the switch door to rotate around the pivoting part.

8. the return air assembly for a duct machine as set forth in claim 7, wherein said urging mechanism includes:

The push rod spare, the push rod spare includes first end and second end, first end with the return air frame is articulated and with the second motor links to each other, the second end with the cooperation of sliding of switch door, second motor drive first end pivoted in-process, the second end is followed the switch door slides in order to promote the switch door winds the pivot spare rotates.

9. The return air assembly for a duct machine according to claim 8, wherein the push rod member is an arcuate rod that is convexly curved away from the pivot member, and the first and second ends are arcuate ends of the push rod member.

10. The return air assembly for a duct machine as set forth in claim 7, wherein said urging mechanism includes:

The second gear piece is arranged on the air return frame and is connected with the second motor so as to be driven by the second motor to rotate;

And the second gear is meshed with the second gear, the free end of the second gear is matched with the switch door in a sliding manner, the second gear translates relative to the return air frame in the rotating process of the second gear, and the free end slides along the switch door to push the switch door to rotate around the pivoting member.

11. the return air assembly for the duct machine according to any one of claims 8 to 10, wherein the opening and closing door includes a door body and a side edge, the side edge is provided on the door body and extends perpendicular to the door body in a direction toward the return air frame, the side edge has a sliding groove, an extending direction of the sliding groove is parallel to a central plane of the door body, and the pushing mechanism is in sliding fit with the opening and closing door through a rolling body fitted in the sliding groove.

12. The return air assembly for a duct machine of claim 11, wherein the return frame has an escape opening therein, the rolling elements being located in the escape opening when the switch door is in a position to close the air inlet.

13. The return air assembly for a duct unit as claimed in claim 2, wherein the switch door is rectangular and has a first actuator and a second actuator disposed at opposite ends of the length of the switch door.

14. The return air assembly for a duct machine according to claim 1, wherein when the switch door is in a position closing the air inlet, an orthographic projection of the return frame on the switch door falls completely within the switch door, so that the return frame is completely hidden by the switch door.

15. A ducted air conditioner including a return air assembly for a ducted air conditioner according to any one of claims 1 to 14.

16. The ducted air conditioner according to claim 15, wherein the drive means drives the opening and closing door to open the air inlet opening in a direction opposite to an opening direction of the outlet of the ducted air conditioner.