Dust removal system and duct type indoor unit

Abstract

The application provides a dust removal system and a duct type indoor unit, and relates to the technical field of air conditioners. The dust removal system comprises a collection box, a suction fan and a dust collection box. The collection box is arranged on the duct type indoor unit and is used for collecting dust on a filter screen at an air inlet side of the duct type indoor unit. The suction fan is in communication with the dust collection box and the collection box through pipelines. The suction fan is used for sending the dust in the collection box into the dust collection box for storage. The dust removal system provided by the application can conveniently and quickly clean the dust in the collection box.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a dust removal system and a duct-type indoor unit. Background Technology

[0002] To prevent dust from being drawn into the heat exchanger and causing blockages, or from blowing dust into the room, ducted indoor units typically have a filter on the air inlet side. Since ducted indoor units are usually installed on the back of the ceiling, installation and maintenance are difficult. To achieve timely cleaning of the filter, a common approach is to install a rotating filter on the air inlet side, along with a collection box and a brush that contacts the rotating filter. The brush removes dust from the filter as it rotates, and the collection box collects and stores the dust. While this solves the problem of difficult filter cleaning, the need for the collection box to be installed on the air inlet side on the back of the ceiling creates a new problem: cleaning the dust inside the collection box itself is difficult. Summary of the Invention

[0003] The problem solved by this invention is that the dust collection box of the filter screen in duct-type indoor units is difficult to clean.

[0004] To address the aforementioned problems, this invention provides a dust removal system that can conveniently and quickly clean the dust inside the collection box.

[0005] An embodiment of the present invention provides a dust removal system applied to a duct-type indoor unit. The dust removal system includes a collection box, an adsorption fan, and a dust collection box. The collection box is disposed on the duct-type indoor unit and is used to collect dust on the filter screen on the air inlet side of the duct-type indoor unit.

[0006] The adsorption fan is connected to the dust collection box and the collection box through a pipeline. The adsorption fan is used to send the dust in the collection box into the dust collection box for storage.

[0007] The dust removal system provided in this embodiment of the invention uses a collection box to collect and store dust on the filter screen. When it is necessary to clean the dust in the collection box, an adsorption fan is turned on, driving airflow to blow the dust in the collection box into the dust collection box, thus cleaning the collection box. Since the dust collection box is connected to the collection box via a pipe, it does not need to be installed on the body of the duct-type indoor unit; it can be placed inside the ceiling or even on the interior wall, making it convenient for users to clean the dust in the dust collection box. Therefore, the dust removal system provided in this embodiment of the invention can more conveniently clean the dust on the filter screen of a duct-type indoor unit.

[0008] In an optional embodiment, the dust collection box is provided with an air inlet chamber and an exhaust chamber. The air inlet chamber has an air inlet on the upper side wall in the vertical direction for air and dust to enter. The lower end of the air inlet chamber in the vertical direction is connected to the lower end of the exhaust chamber in the vertical direction. The exhaust chamber has an air outlet on the upper side wall in the vertical direction.

[0009] In practical applications, the mixture of dust and air in the collection box enters the air intake chamber through the air inlet. Under the action of gravity, the dust is deposited at the lower end of the air intake chamber, while the air enters the exhaust chamber and is discharged through the air outlet at the upper end of the exhaust chamber, thus achieving the separation of air and dust.

[0010] In an optional embodiment, a return plate is provided on the side wall of the exhaust chamber. The return plate is inclined in the vertical direction. The higher side of the return plate in the vertical direction is connected to the side wall of the exhaust chamber, and an air passage for air circulation is formed between the lower side of the return plate in the vertical direction and the side wall of the exhaust chamber.

[0011] The return plate plays a role in suppressing dust in the exhaust chamber. As some dust flows upward with the air, it is drawn back downward by the return plate and then redeposited at the lower end of the exhaust chamber. The air flows through the air channel between the return plate and the side wall of the exhaust chamber to the outlet and is discharged, further improving the separation effect of dust and air.

[0012] In an optional embodiment, the dust collection box includes a box body and a cover body. The cover body and the box body are detachably connected and together form a cavity for containing dust. The box body is provided with a conveying port for dust to enter the cavity, and the cover body is provided with a suction port for a vacuum cleaner nozzle to be inserted into the cavity.

[0013] The cover has a suction port for inserting a vacuum cleaner nozzle. In practical applications, when users need to clean the dust collection box, they can insert the vacuum cleaner nozzle into the suction port to suck out the dust in the dust collection box, thus achieving quick cleaning of the dust in the dust collection box.

[0014] In an optional implementation, the cover can form multiple connection states with the box body, and the suction port faces different directions in different connection states.

[0015] To adapt to different application environments and facilitate multi-angle operation by users, in this embodiment, the cover can form multiple connection states with the box, that is, the cover can be connected to the box at multiple angles, so that the suction port faces different directions, and thus the vacuum cleaner nozzle can be inserted into the dust collection box from multiple directions.

[0016] In an optional embodiment, the suction port is provided with an elastic cover plate, which is used to cover the suction port and to open the suction port under the action of external force.

[0017] The flexible cover closes the suction port in its natural state to prevent dust leakage. When the vacuum cleaner nozzle is inserted, the flexible cover flips inward under the pushing force of the nozzle, accumulating elastic potential energy and opening the suction port for the nozzle to be inserted. After the nozzle is removed, the flexible cover releases its elastic potential energy and returns to its original position, achieving automatic closure of the suction port.

[0018] In an optional embodiment, the suction port is provided with a connector for guiding the vacuum cleaner nozzle into the suction port.

[0019] The insertion tube guides the suction nozzle into the dust collection box, facilitating user operation and enabling automatic positioning.

[0020] In an optional embodiment, the two opposite ends of the dust collection box are connected to the collection box and the adsorption fan respectively via pipelines.

[0021] The dust collection box is connected to the collection box and the adsorption fan at opposite ends via pipes. The adsorption fan is positioned downstream of the dust collection box in the direction of airflow to prevent dust from accumulating in the collection box at the adsorption fan.

[0022] In an optional embodiment, a dustproof net is provided inside the dust collection box between the two ends connecting the collection box and the adsorption fan.

[0023] A dust filter is installed inside the dust collection box to separate dust from the air, keeping the dust inside the dust collection box while the air flows towards the adsorption fan, preventing the dust from reaching the adsorption fan.

[0024] In an optional embodiment, the dust collection box is provided with an air inlet manifold, an air outlet manifold, and a spiral separator.

[0025] The spiral separator is provided with an air inlet and an air outlet. The spiral separator is provided with a separation channel extending from the air inlet to the air outlet. The cross-sectional area of ​​the separation channel gradually decreases from the air inlet to the air outlet. The air inlet is connected to the internal space of the dust collection box.

[0026] The intake manifold connects the collection box to the side wall of the intake end via a pipeline, so that the dust in the collection box is mixed with air and then input into the separation channel from the side of the intake end, so that the mixed airflow composed of dust and air rotates and flows towards the outlet end.

[0027] The air outlet manifold extends into the separation channel from the end wall of the air inlet end, and the air outlet manifold is connected to the adsorption fan through a pipeline. The air outlet manifold is used to extract the air located at the center of the separation channel under the action of the adsorption fan.

[0028] The mixed airflow enters the spiral separator through the inlet manifold from the collection box. Within the spiral separator, it rotates from the inlet to the outlet. During this rotational flow, due to the large mass of the dust particles, they experience significant centrifugal force, gradually distributing into the outer layer near the inner wall of the separation channel. Air in the inner layer is drawn away from the separation channel by the adsorption fan through the outlet manifold. Under gravity, the dust gradually exits from the outlet of the separation channel, entering the dust collection box and settling at the bottom, thus achieving automatic separation of dust and air.

[0029] In an optional embodiment, the collection box and the dust collection box are connected by a pipeline, the suction end of the adsorption fan is connected to the dust collection box by a pipeline, the blowing end of the adsorption fan is used to connect to the building exhaust pipe, and the blowing end of the adsorption fan is equipped with an anti-backflow device.

[0030] The adsorption fan directly sends the dust from the dust collection box into the building's exhaust pipe, and then sends the dust out of the building through the exhaust pipe, thus achieving automatic cleaning of the dust in the dust collection box.

[0031] This invention also provides a duct-type indoor unit, including an intake fan, a heat exchanger, and the aforementioned dust removal system. The dust removal system includes a collection box, an adsorption fan, and a dust collection box. The collection box is disposed on the duct-type indoor unit and is used to collect dust from the filter screen on the air intake side of the duct-type indoor unit. The adsorption fan is connected to the dust collection box and the collection box via a pipeline, and is used to send the dust in the collection box into the dust collection box for storage. The intake fan has a rotating filter screen at its intake end, which rotates during the operation of the intake fan. The blower end of the intake fan blows air onto the heat exchanger. The collection box is disposed on the intake fan and is used to scrape dust from the rotating filter screen during its rotation. Attached Figure Description

[0032] Figure 1 A schematic diagram of the dust removal system provided in the first embodiment of the present invention in practical application;

[0033] Figure 2 for Figure 1 Schematic diagram of the connection structure between the collection box and the rotating filter screen;

[0034] Figure 3 for Figure 1 Schematic diagram of the central dust collection box;

[0035] Figure 4 for Figure 3 A sectional view from a first-person perspective;

[0036] Figure 5 A schematic diagram of the structure of the dust collection box in the dust removal system provided in the second embodiment of the present invention;

[0037] Figure 6 for Figure 5 Another connection state between the lid and the box;

[0038] Figure 7 A schematic diagram of the structure of the dust removal system provided in the third embodiment of the present invention in practical application;

[0039] Figure 8 for Figure 7 A schematic diagram of the central dust collection box from a second-view perspective;

[0040] Figure 9 for Figure 7 A schematic diagram of the central dust collection box from a third-person perspective;

[0041] Figure 10 This is a schematic diagram of the dust removal system provided in the fourth embodiment of the present invention in practical application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10-Indoor unit with ductwork; 11-Shell; 13-Inlet fan; 14-Rotating filter; 15-Heat exchanger; 17-Exhaust pipe; 100-Dust removal system; 110-Collection box; 111-Fixed brush; 130-Adsorption fan; 150-Dust collection box; 151-Inlet chamber; 1511-Inlet; 152-Exhaust chamber; 1521-Outlet; 153-Return plate; 1531-Air passage; 154-Box body; 1541-Conveying port; 155-Cover; 1551-Dust suction port; 1552-Flexible cover; 1553-Plug-in tube; 156-Inlet manifold; 157-Outlet manifold; 158-Spiral separator; 1581-Inlet end; 1582-Outlet end; 1583-Separation channel; 170-Anti-backflow device. Detailed Implementation

[0044] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] Please see Figure 1 , Figure 1 The diagram shown is a structural schematic of the dust removal system 100 provided in the first embodiment of the present invention in practical application.

[0046] The dust removal system 100 provided in this embodiment is applied to a duct-type indoor unit 10 and can clean and remove dust from the air inlet filter of the duct-type indoor unit 10. The dust removal system 100 includes a collection box 110, an adsorption fan 130, and a dust collection box 150. The collection box 110 is installed on the duct-type indoor unit 10 and is used to collect dust from the air inlet filter of the duct-type indoor unit 10. The adsorption fan 130 is connected to the dust collection box 150 and the collection box 110 through a pipeline. The adsorption fan 130 is used to send the dust in the collection box 110 into the dust collection box 150 for storage.

[0047] The duct-type indoor unit 10 includes a housing 11 and conventional components such as an intake fan 13 and a heat exchanger 15 disposed within the housing 11. The intake fan 13 draws in ambient air and blows it towards the heat exchanger 15 for heat exchange, allowing the heat-exchanged air to enter the room. Please refer to [link / reference]. Figure 2 In this embodiment, a rotating filter 14 is provided at the air intake end of the air intake fan 13. The rotating filter 14 can rotate during the air intake process of the air intake fan 13. The air blowing end of the air intake fan 13 is used to blow the filtered air into the heat exchanger 15. A collection box 110 is provided on the air intake fan 13. A fixed brush 111 is provided at the opening of the collection box 110 to contact the rotating filter 14. The fixed brush 111 is used to scrape the dust on the rotating filter 14 and store it during the rotation of the rotating filter 14.

[0048] Since the duct-type indoor unit 10 typically draws air from multiple directions and is equipped with multiple rotating filters 14, the dust removal system 100 provided in this embodiment includes multiple collection boxes 110. Each collection box 110 scrapes and stores dust from the rotating filters 14. All collection boxes 110 are connected to the adsorption fan 130 and the dust collection box 150 via pipes. When the adsorption fan 130 is running, the dust from all collection boxes 110 is sent to the dust collection box 150 for unified storage, solving the problem of time-consuming and labor-intensive individual cleaning of multiple collection boxes 110 in the prior art.

[0049] The adsorption fan 130 is connected to the dust collection box 150 and the collection box 110 via pipelines. In practical applications, according to the airflow direction in the pipeline, the adsorption fan 130 can be positioned between the collection box 110 and the dust collection box 150, that is, the adsorption fan 130 is positioned upstream of the dust collection box 150, blowing the mixed airflow of dust and air into the dust collection box 150. Alternatively, the adsorption fan 130 can be positioned downstream of the dust collection box 150, drawing the mixed airflow into the dust collection box 150, where the dust collection box 150 separates the air from the dust, thus storing the dust.

[0050] Please see Figure 3In this embodiment, the dust collection box 150 is provided with an air inlet chamber 151 and an exhaust chamber 152. The air inlet chamber 151 has an air inlet 1511 on the upper side wall in the vertical direction for air and dust to enter. The lower end of the air inlet chamber 151 in the vertical direction is connected to the lower end of the exhaust chamber 152 in the vertical direction. The exhaust chamber 152 has an air outlet 1521 on the upper side wall in the vertical direction.

[0051] In practical applications, the air inlet 1511 can be connected to the blowing end of the adsorption fan 130 via a pipeline, and the air outlet 1521 can be connected to the outside. Alternatively, the air inlet 1511 can be directly connected to the collection box 110 via a pipeline, and the air outlet 1521 can be connected to the suction end of the adsorption fan 130 via a pipeline. During rotation, the adsorption fan 130 sends the dust-air mixture stored in the collection box 110 into the intake chamber 151 through the air inlet 1511. After the mixed airflow enters the intake chamber 151, most of the dust gradually settles at the lower end of the intake chamber 151 under gravity, and the air enters the exhaust chamber 152. As the mixed airflow continues to flow in, the air gradually rises and is discharged through the air outlet 1521 located at the upper end of the exhaust chamber 152, achieving separation from the dust.

[0052] Considering that some dust may rise with the air in the exhaust chamber 152 during practical applications, to prevent this dust from reaching the air outlet 1521, please refer to [the relevant documentation / reference]. Figure 4 In this embodiment, a return plate 153 is also provided on the side wall of the exhaust chamber 152. The return plate 153 serves to guide the airflow downwards, thereby preventing dust from rising inside the exhaust chamber 152. The return plate 153 is inclined in the vertical direction. The higher side of the return plate 153 in the vertical direction is connected to the side wall of the exhaust chamber 152, and the lower side of the return plate 153 in the vertical direction forms an air passage 1531 for air circulation between it and the side wall of the exhaust chamber 152.

[0053] In practical applications, some dust rises with the air in the exhaust chamber 152. When it rises to the return plate 153, it is blocked by the return plate 153 and flows back downward under the guidance of the return plate 153, thereby guiding the dust to redeposit at the bottom of the exhaust chamber 152. The air can rise through the air passage 1531 formed between the return plate 153 and the side wall of the exhaust chamber 152, pass over the return plate 153, and then reach the air outlet 1521 for discharge.

[0054] In order to further improve the separation effect of dust and air and further prevent dust from flowing out of the air outlet 1521, in this embodiment, the air outlet 1521 is also provided with a filter screen with a filtering effect.

[0055] In practical applications, after the duct-type indoor unit 10 is shut down, the intake fan 13 continues to rotate at a low speed for a period of time. The speed of the intake fan 13 should not be too high to prevent the dust on the rotating filter 14 from being subjected to excessive suction and failing to be scraped off by the collection box 110. While controlling the intake fan 13 to rotate at a low speed, the adsorption fan 130 is started to send the dust in the collection box 110 to the dust collection box 150. After the intake fan 13 stops rotating, the adsorption fan 130 continues to run for a period of time to ensure that the dust in the collection box 110 is thoroughly cleaned.

[0056] Please see Figure 5 , Figure 5 The diagram shown is a structural schematic of the dust collection box 150 in the dust removal system 100 provided in the second embodiment of the present invention.

[0057] Except for the structure of the dust collection box 150, the dust removal system 100 provided in this embodiment is the same as that in the first embodiment. In this embodiment, the dust collection box 150 includes a box body 154 and a cover 155. The cover 155 and the box body 154 are detachably connected and together form a cavity for containing dust. The box body 154 is provided with a conveying port 1541 for dust to enter the cavity. The conveying port 1541 is used to connect to a pipeline so that the mixed airflow composed of dust and air in the collection box 110 can enter the cavity. The cover 155 is provided with a suction port 1551 for the suction nozzle of a vacuum cleaner to be inserted into the cavity.

[0058] The suction port 1551 is equipped with a resilient cover 1552. In its natural state, the resilient cover 1552 seals the suction port 1551 to prevent air and dust from leaking out. When the vacuum cleaner nozzle is inserted, the resilient cover 1552 is pushed inward by the nozzle, accumulating elastic potential energy, opening the suction port 1551, allowing the vacuum cleaner nozzle to be inserted to suck up the dust stored in the dust collection box 150, thus cleaning the dust collection box 150. After the nozzle is removed, the resilient cover 1552 releases its elastic potential energy and returns to its original position, automatically closing the suction port 1551.

[0059] Considering that vacuum cleaner nozzles may be difficult to insert in different application environments, please refer to [link / reference needed]. Figure 6 In this embodiment, the cover 155 can be assembled with the box 154 at various different angles, thereby forming multiple different connection states. In different connection states, the suction port 1551 faces different directions.

[0060] In practical applications, users can adjust the orientation of the suction port 1551 by adjusting the connection state between the cover 155 and the box 154, that is, by adjusting the assembly angle of the cover 155 on the box 154, so as to adjust it to a direction that is convenient for inserting the vacuum cleaner nozzle.

[0061] Furthermore, considering that in actual operation, there may be difficulties in aligning the nozzle with the suction port 1551, resulting in the nozzle not being able to be quickly and accurately inserted into the dust collection box 150, in this embodiment, a connector 1553 is also provided on the cover 155 at the position corresponding to the suction port 1551. The connector 1553 is used to guide the vacuum cleaner nozzle into the suction port 1551. The end of the connector 1553 away from the suction port 1551 is designed with a wide opening to facilitate the quick insertion of the nozzle.

[0062] Please see Figure 7 , Figure 7 The diagram shown is a structural schematic of the dust removal system 100 provided in the third embodiment of the present invention in practical application.

[0063] In the dust removal system 100 provided in this embodiment, the adsorption fan 130 is located downstream of the dust collection box 150 in the airflow direction. That is, the suction end of the adsorption fan 130 is connected to the dust collection box 150 through a pipe, and the blowing end of the adsorption fan 130 is connected to the internal space of the casing 11 of the duct-type indoor unit 10 through a pipe.

[0064] After the dust collection box 150 separates the dust from the air, the adsorption fan 130 sends the separated air into the housing 11 of the duct-type indoor unit 10, and then it is blown back to the heat exchanger 15 by the intake fan 13, thus compensating for the intake air volume and solving the problem that the adsorption fan 130 may cause a reduction in the intake air volume during operation.

[0065] Except for the dust collection box 150, all components of the dust removal system 100 provided in this embodiment are the same as those in the first embodiment. In this embodiment, the structure of the dust collection box 150 is as follows: Figure 8 and Figure 9 As shown.

[0066] In this embodiment, the dust collection box 150 is provided with an air inlet manifold 156, an air outlet manifold 157 and a spiral separator 158. The spiral separator 158 is provided with an air inlet end 1581 and an air outlet end 1582. The spiral separator 158 is provided with a separation channel 1583 extending from the air inlet end 1581 to the air outlet end 1582. The cross-sectional area of ​​the separation channel 1583 gradually decreases from the air inlet end 1581 to the air outlet end 1582. The air inlet end 1581 is connected to the internal space of the dust collection box 150.

[0067] The intake manifold 156 connects the collection box 110 to the side wall of the intake end 1581 through a pipeline. That is, the intake manifold 156 is connected to the collection box 110 through a pipeline, and the intake manifold 156 is connected to the side wall of the intake end 1581 of the bolt separator and connected to the separation channel 1583. This allows the dust in the collection box 110 to be mixed with air and then fed into the separation channel 1583 from the side of the intake end 1581, so that the mixed airflow composed of dust and air rotates and flows towards the outlet end 1582.

[0068] In practical applications, under the action of the adsorption fan 130, the mixed airflow of dust and air in the collection box 110 flows into the air intake manifold 156, and then flows laterally into the separation channel 1583 from the air intake end 1581 of the spiral separator 158. After the mixed airflow flows laterally into the separation channel 1583, it rotates from the air intake end 1581 to the air outlet end 1582. During this process, the dust in the mixed airflow, due to its large mass, is subjected to a large centrifugal force and is distributed in the outer ring near the inner wall of the separation channel 1583, while the air accumulates in the central area of ​​the separation channel 1583.

[0069] The exhaust manifold 157 extends from the end wall of the inlet 1581 into the separation channel 1583, and is connected to the adsorption fan 130 via a pipe. The exhaust manifold 157 is used to extract air from the center of the separation channel 1583 under the action of the adsorption fan 130. The exhaust manifold 157 extracts air from the central area of ​​the separation channel 1583, and dust gradually enters the internal space of the dust collection box 150 from the outlet 1582 of the separation channel 1583. Then, under gravity, it settles at the bottom of the dust collection box 150, achieving separation of dust and air. The separated air is then reintroduced into the casing 11 of the duct-type indoor unit 10 by the adsorption fan 130, and is blown back towards the heat exchanger 15 under the action of the intake fan 13, thus compensating for the air intake volume.

[0070] Please see Figure 10 , Figure 10 The diagram shown is a structural schematic of the dust removal system 100 provided in the fourth embodiment of the present invention in practical application.

[0071] In this embodiment, the dust removal system 100 has an adsorption fan 130 positioned downstream of the dust collection box 150 in the airflow direction, meaning the suction end of the adsorption fan 130 is connected to the dust collection box 150 via a pipe. Furthermore, in this embodiment, the blowing end of the adsorption fan 130 is connected via a pipe to the exhaust pipe 17 of the building where the duct-type indoor unit 10 is located.

[0072] In this embodiment, when the adsorption fan 130 is in operation, it can directly send the dust in the dust collection box 150 into the building exhaust pipe 17. Therefore, there is no need to configure a dust separation structure in the dust collection box 150. The dust collection box 150 only serves as a temporary storage for dust.

[0073] To prevent backflow of air into the exhaust pipe 17, in this embodiment, the blowing end of the adsorption fan 130 is also equipped with an anti-backflow device 170.

[0074] In summary, the dust removal system 100 provided by this invention, by configuring the adsorption fan 130 and the dust collection box 150 to be connected to the collection box 110, allows the dust collection box 150 to be placed in a convenient cleaning location, solving the problem of difficult dust removal from the collection box 110. Furthermore, by sending all the dust from multiple collection boxes 110 into the dust collection box 150 for unified storage, it solves the problem of time-consuming and laborious individual cleaning of multiple collection boxes 110 in the prior art.

[0075] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A dust removal system applied to a duct-type indoor unit (10), characterized in that, The dust removal system (100) includes a collection box (110), an adsorption fan (130), and a dust collection box (150). The collection box (110) is installed on the duct-type indoor unit (10) and is used to collect dust on the filter screen on the air inlet side of the duct-type indoor unit (10). The adsorption fan (130), the dust collection box (150) and the collection box (110) are all connected by pipelines. The adsorption fan (130) is used to send the dust in the collection box (110) into the dust collection box (150) for storage. The dust collection box (150) is provided with an air inlet chamber (151) and an exhaust chamber (152). The air inlet chamber (151) has an air inlet (1511) on the upper side wall in the vertical direction for air and dust to enter. The lower end of the air inlet chamber (151) in the vertical direction is connected to the lower end of the exhaust chamber (152) in the vertical direction. The exhaust chamber (152) has an air outlet (1521) on the upper side wall in the vertical direction. The dust collection box (150) is connected to the collection box (110) and the adsorption fan (130) respectively through pipelines at its two opposite ends.

2. The dust removal system according to claim 1, characterized in that, A return plate (153) is provided on the side wall of the exhaust chamber (152). The return plate (153) is inclined in the vertical direction. The higher side of the return plate (153) in the vertical direction is connected to the side wall of the exhaust chamber (152). An air passage (1531) for air circulation is formed between the lower side of the return plate (153) in the vertical direction and the side wall of the exhaust chamber (152).

3. The dust removal system according to claim 1, characterized in that, The dust collection box (150) includes a box body (154) and a cover (155). The cover (155) is detachably connected to the box body (154) and together they form a cavity for containing dust. The box body (154) has a conveying port (1541) for dust to enter the cavity, and the cover (155) has a suction port (1551) for a vacuum cleaner nozzle to be inserted into the cavity.

4. The dust removal system according to claim 3, characterized in that, The cover (155) can form multiple connection states with the box (154), and the suction port (1551) faces different directions in different connection states.

5. The dust removal system according to claim 3, characterized in that, The suction port (1551) is provided with an elastic cover plate (1552), which is used to cover the suction port (1551) and to open the suction port (1551) under the action of external force.

6. The dust removal system according to claim 3, characterized in that, The suction port (1551) is provided with a connector (1553), which is used to guide the suction nozzle of the vacuum cleaner into the suction port (1551).

7. The dust removal system according to claim 1, characterized in that, A dustproof net is provided inside the dust collection box (150) between the two ends connecting the collection box (110) and the adsorption fan (130).

8. The dust removal system according to claim 1, characterized in that, The dust collection box (150) is provided with an air inlet manifold (156), an air outlet manifold (157), and a spiral separator (158). The spiral separator (158) is provided with an air inlet (1581) and an air outlet (1582). The spiral separator (158) is provided with a separation channel (1583) extending from the air inlet (1581) to the air outlet (1582). The cross-sectional area of ​​the separation channel (1583) gradually decreases from the air inlet (1581) to the air outlet (1582). The air inlet (1581) is connected to the internal space of the dust collection box (150). The intake manifold (156) connects the collection box (110) to the side wall of the intake end (1581) through a pipeline, so that the dust in the collection box (110) is mixed with air and then input into the separation channel (1583) from the side of the intake end (1581), so that the mixed airflow composed of dust and air rotates and flows towards the outlet end (1582). The exhaust manifold (157) extends into the separation channel (1583) from the end wall of the air inlet (1581), and the exhaust manifold (157) is connected to the adsorption fan (130) through a pipeline. The exhaust manifold (157) is used to extract the air located at the center of the separation channel (1583) under the action of the adsorption fan (130).

9. The dust removal system according to claim 1, characterized in that, The collection box (110) and the dust collection box (150) are connected by a pipeline. The suction end of the adsorption fan (130) is connected to the dust collection box (150) by a pipeline. The blowing end of the adsorption fan (130) is used to connect to the building exhaust pipe (17). The blowing end of the adsorption fan (130) is equipped with an anti-backflow device (170).

10. A duct-type indoor unit, characterized in that, The system includes an air intake fan (13), a heat exchanger (15), and a dust removal system (100) as described in any one of claims 1-9. The air intake fan (13) is provided with a rotating filter (14) at its suction end. The rotating filter (14) is used to rotate during the operation of the air intake fan (13). The air blowing end of the air intake fan (13) is used to blow air to the heat exchanger (15). The collection box (110) is provided on the air intake fan (13) and is used to scrape the dust on the rotating filter (14) during the rotation of the rotating filter (14).

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