A vacuum cleaner with a viewing window

Abstract

The utility model relates to a dust collector with visual window, including equipment main part, sewage tank and clean water tank, the assembly groove for installing sewage tank and clean water tank simultaneously is set up on equipment main part, the visual window is equipped on equipment main part, and the water level line of sewage tank and / or clean water tank can be observed through the visual window, the utility model discloses a kind of compact structure and can observe the dust collector with visual window of sewage tank and clean water level condition to solve the technical problem that existing dust collector is larger and cannot observe the sewage tank and clean water level condition in it.

Description

Technical Field

[0001] This utility model belongs to the field of cleaning device technology, and in particular relates to a vacuum cleaner with a viewing window. Background Technology

[0002] Existing vacuum cleaners typically have the function of sucking up sewage and collecting it, and they have many advantages such as being convenient to use, environmentally friendly, and efficient.

[0003] For example, the Chinese utility model patent with publication number "CN217556532U" entitled "A Wastewater Tank and Fabric Cleaning Machine" discloses a wastewater tank and a fabric cleaning machine. The wastewater tank is used in the fabric cleaning machine and includes a tank body and a wastewater chamber opened in the tank body. The top of the tank body is provided with a drain port that communicates with the wastewater chamber. The dirt in the wastewater tank can be poured out by flipping the wastewater tank.

[0004] However, when the above-mentioned products need to discharge sewage from the sewage tank, the sealing cover on the sewage tank needs to be removed for inspection before subsequent discharge operations can be carried out, which makes it inconvenient for users to observe the internal water level in a timely manner; in addition, the above-mentioned patented products have a structure that fixes the sewage tank and the clean water tank on the two sides of the main body of the equipment, which results in a large and not compact size. Furthermore, even if the above structure is equipped with viewing windows, they need to be set up separately on both sides of the corresponding sewage tank and clean water tank, making it impossible to set up only one viewing window and simultaneously observe the water levels in the sewage tank and clean water tank. Utility Model Content

[0005] The purpose of this invention is to provide a vacuum cleaner with a compact structure and a viewing window that allows observation of the water levels in the wastewater tank and clean water tank, thereby solving the technical problem that existing vacuum cleaners are bulky and cannot show the water levels in their wastewater tank and clean water tank.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a vacuum cleaner with a viewing window, comprising a device body, a wastewater tank and a clean water tank, wherein the device body is provided with an assembly slot for simultaneously installing the wastewater tank and the clean water tank, and the device body is provided with a viewing window through which the water level lines of the wastewater tank and / or the clean water tank can be observed.

[0007] Preferably, the viewing window is located on the main body of the device and corresponds to both sides of the assembly slot, and a transparent baffle is provided at the viewing window.

[0008] Preferably, the transparent baffle includes an outer frame fixedly installed within the viewing window and a glass or transparent plastic panel enclosing and fixed within the outer frame.

[0009] Preferably, the assembly slot is provided with an air inlet for connecting an external air duct and an air outlet for connecting the suction end of a suction motor. The wastewater tank is equipped with a top cover, and the top cover has a first air duct and a second air duct. When the wastewater tank is installed in the assembly slot, the first air duct and the second air duct are respectively connected to the air inlet and the air outlet.

[0010] Preferably, a positioning part is formed on one side of the top cover, extending laterally relative to the sewage tank. The bottom of the positioning part is provided with an air inlet and an air outlet that are respectively connected to the first air duct and the second air duct. A positioning groove matching the positioning part is formed on one side of the assembly groove. The air inlet and the air outlet are located on both sides of the positioning groove.

[0011] Preferably, the bottom of the suction motor is provided with an exhaust seat, the exhaust seat is provided with an air outlet slot that communicates with the exhaust end of the suction motor, and a purification air slot is provided at the bottom of the main body of the device corresponding to the position of the air outlet slot.

[0012] Preferably, the bottom of the top cover is provided with an internally hollow filter section, the filter section is provided with a detachable filter assembly, and a filter air cavity is formed inside the top cover that communicates with the filter section and the filter air cavity is connected to a second air duct.

[0013] Preferably, the first air duct is connected to the external air duct through the air inlet, and its other end is connected to the filter section through a long air box located below the top cover.

[0014] Preferably, the filter assembly includes a filter frame and a filter barrel for limiting the filter frame within the filter section. The filter barrel has a cavity, and a filter element is disposed within the cavity. The filter barrel has a plurality of filter openings corresponding to the outer surface of the filter element.

[0015] Preferably, the external air duct includes an outer tube installed on one side of the device body for connecting the brush head and an inner tube disposed inside the device body. One end of the inner tube is connected to the outer tube, and the other end extends into the air inlet for connecting to the first air duct.

[0016] By providing the above technical solution, this utility model has the following advantages compared with the prior art: By providing an assembly slot on the main body of the device for simultaneously storing a sewage tank and a clean water tank, and by providing viewing windows on both sides of the assembly slot for observing the contents, when the sewage tank and clean water tank are installed in the assembly slot, the viewing windows allow the user to directly observe the water levels in the sewage tank and clean water tank without having to remove the sealing cap from the sewage tank. This solves the technical problem that existing vacuum cleaners cannot directly observe the water levels in their sewage and clean water tanks. Furthermore, by providing an assembly slot that can simultaneously accommodate both the sewage tank and the clean water tank, the entire device becomes more compact and aesthetically pleasing, reducing its size. The viewing windows on both sides of the assembly slot allow for direct and simultaneous observation of the water levels in both the sewage tank and the clean water tank, solving the technical problem that existing vacuum cleaners are bulky and the water levels in their sewage and clean water tanks cannot be observed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the assembled structure of the main body of the device and the sewage tank of this utility model; Figure 3 This is a schematic diagram of the assembled structure of the main body of the equipment, the sewage tank, and the clean water tank of this utility model. Figure 4 This is an exploded view of the present invention; Figure 5 This is a side view of the structure of this utility model; Figure 6 This is a schematic diagram of the connection structure between the external air duct and the airflow duct of this utility model; Figure 7 This is a top view of the structure of this utility model; Figure 8 For the present utility model Figure 7 Schematic diagram of the cross-sectional structure at point AA; Figure 9 For the present utility model Figure 7 Schematic diagram of the cross-sectional structure at point BB; Figure 10 This is a side sectional view of the present invention. Figure 11 This is a bottom view of the structure of this utility model; Figure 12 This is a schematic diagram of the sewage tank and suction motor structure of this utility model; Figure 13 This is a schematic diagram of the connection structure between the sewage tank and the external air duct of this utility model; Figure 14 This is a schematic diagram of the internal structure of the sewage tank of this utility model; Figure 15 This is a top view of the internal structure of the sewage tank of this utility model; Figure 16 This is a schematic diagram of the wastewater tank and filter assembly of this utility model; Figure 17 This is an exploded view of the filter section and filter assembly of this utility model; Figure 18 This is a schematic diagram of the filter barrel structure of this utility model; Figure 19 For the present utility model Figure 14 A partially enlarged structural diagram; The utility model reference information is as follows: 1. Main body of the equipment; 2. Wastewater tank; 3. External air duct; 4. Suction motor; 5. Filter assembly; 6. Exhaust seat; 7. Press switch; 9. Filter section; 20. Movable position; 30. Clean water tank; 40. Viewing window; 50. Transparent baffle; 100. Airflow pipe; 101. Assembly slot; 102. Air inlet; 103. Exhaust outlet; 104. Positioning slot; 105. Purification air duct; 110. Lower shell; 111. Upper shell; 201. Top cover; 202. First 203. Air duct; 204. Second air duct; 205. Positioning part; 206. Air inlet; 207. Air outlet; 208. Filter chamber; 209. Long air box; 301. Slot; 302. Outer pipe; 401. Inner pipe; 402. Hook; 501. Protruding end; 501. Filter frame; 502. Filter barrel; 503. Filter element; 504. Filter port; 505. Locking part; 506. Locking groove; 507. Upper baffle; 508. Limiting groove; 601. Air outlet groove; The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The following will refer to the appendix in the embodiments of this utility model. Figure 1-19The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0022] like Figure 1-19 As shown: A vacuum cleaner with a viewing window includes a main body 1, a wastewater tank 2, and a clean water tank 30. The main body 1 can be a vacuum cleaner, a floor scrubber, or a fabric cleaning machine. In this embodiment, it is a fabric cleaning machine. The main body 1 is hinged with a handle for easy lifting. The main body 1 consists of a lower shell 110 and an upper shell 111. The clean water tank 30 is provided with a water inlet for injecting clean water and a handle groove for easy gripping. The main body 1 is provided with an assembly slot 101 for simultaneously installing the wastewater tank 2 and the clean water tank 30. The main body 1 is provided with a viewing window 40 through which the water level lines of the wastewater tank 2 and / or the clean water tank 30 can be observed. When the wastewater tank 2 and the clean water tank 30 are installed in the assembly slot 101, the wastewater tank 2 and the clean water tank 30 are visualized through the viewing window 40, allowing the user to directly observe the water level of the wastewater tank 2 and the clean water tank 30.

[0023] like Figure 1-5As shown: The viewing window 40 is opened on the main body of the equipment 1 and corresponds to both sides of the assembly tank 101. A transparent baffle 50 is provided at the viewing window 40. By opening the viewing window 40 on both sides of the assembly tank 101, the water level lines of the sewage tank 2 and the clean water tank 30 can be observed at the same time. The transparent baffle 50 can protect the internal sewage tank 2 and clean water tank 30, and also isolate the assembly tank 101 from the outside world to prevent dust from entering.

[0024] like Figure 1-5 As shown: The transparent baffle 50 includes an outer frame fixedly installed inside the viewing window 40 and a glass or transparent plastic panel enclosing and fixed inside the outer frame. In this embodiment, the outer frame is fixed inside the viewing window 40 by means of threaded installation. When assembling the transparent baffle 50, the glass or transparent plastic panel is first pre-installed in the outer frame, and then the outer frame is snapped into the viewing window 40 and then the outer frame is restricted in the viewing window 40 by the threaded hole at the bottom.

[0025] like Figure 2-10 As shown: The assembly slot 101 is provided with an air inlet 102 for connecting the external air duct 3 and an air outlet 103 for connecting the suction end of the suction motor 4. The sewage tank 2 is equipped with a top cover 201, which has a first air duct 202 and a second air duct 203. When the sewage tank 2 is installed in the assembly slot 101, the first air duct 202 and the second air duct 203 are respectively connected to the air inlet 102 and the air outlet 103.

[0026] The working principle is as follows: During use, the main body 1 of the device is connected to a brush head or cleaning head via an external air duct 3. When cleaning, the brush head is aimed at the item to be cleaned, and then the suction motor 4 is started, creating a negative pressure in the entire air duct structure system. Dirty airflow, water, or impurities are drawn in from the brush head through the external air duct 3 and enter the first air duct 202 through the air inlet 102 and air inlet pipe 205. Subsequently, the airflow enters the long air box 208 and is guided to the filter section 9. The filter components in the filter section 9 trap solid dirt, while wastewater is retained in the wastewater tank 2. The preliminarily purified air enters the filter air chamber 207 and then flows into the second air duct 203. Finally, clean air is drawn in by the suction motor 4 through the exhaust pipe 206 and exhaust outlet 103 and is finally discharged from the exhaust slot 601 of the exhaust seat 6.

[0027] like Figure 2-10As shown in Figures 12-16: A positioning part 204 is formed on one side of the top cover 201, extending laterally relative to the sewage tank 2. The positioning part 204 and the top cover 201 are integrally formed. The bottom of the positioning part 204 is provided with an air inlet 205 and an air outlet 206 that respectively connect to the first air duct 202 and the second air duct 203. A positioning groove 104 matching the positioning part 204 is formed on one side of the assembly groove 101. The air inlet 102 and the air outlet 103 are located on both sides of the bottom surface of the positioning groove 104. The positioning part 204 and the positioning groove 104 are provided so that when installing the sewage tank 2, the user only needs to align the positioning part 204 on the top cover 201 with the positioning groove 104 on the assembly groove 101 of the equipment body 1, and then put it down. During this process, the positioning part 204 slides down along the positioning groove 104, automatically guiding the air inlet 205 to align with the air inlet 102 and the air outlet 206 to align with the air outlet 103. This design enables blind installation, eliminating the need for users to look down or repeatedly adjust the alignment, greatly improving installation speed and convenience.

[0028] Other examples Figure 6-8 As shown, an airflow pipe 100 integrally formed with the main body 1 is provided below the exhaust port 103. The airflow pipe 100 connects the second air duct 203 and the suction end of the suction motor 4 so as to draw clean gas into the suction motor 4. At the same time, the inner side of the exhaust port 103 has several tenons, and the outer wall of the exhaust pipe port 206 has several slots that align with the tenons. When the sewage tank 2 is installed in the assembly slot 101, the positioning part 204 is inserted into the positioning slot 104. The air inlet 205 and the exhaust pipe port 206 are respectively installed at the air inlet 102 and the exhaust port 103. The exhaust pipe port 206 extends into the exhaust port 103, and the slot on its side wall engages with the tenons on the inner side of the exhaust port 103, realizing a slight restriction between the sewage tank 2 and the assembly slot 101. This restriction can be easily released with a large force to facilitate the removal of the sewage tank 2.

[0029] like Figure 9-12 As shown: The bottom of the suction motor 4 is provided with an exhaust seat 6. The suction motor 4 is fixedly installed on the exhaust seat 6 by a threaded connection. The exhaust seat 6 is provided with an air outlet slot 601 that is connected to the exhaust end of the suction motor 4. A purification air slot 105 is provided at the bottom of the main body 1 corresponding to the position of the air outlet slot 601. The function of the exhaust seat 6 is to support the suction motor 4 and guide the filtered airflow to the air outlet slot 601. Through the purification air slot 102 at the bottom, the entire main body 1 of the equipment forms a self-circulating filtration structure, thereby ensuring that the exhaust airflow is clean airflow.

[0030] like Figure 16-19As shown: The bottom of the top cover 201 is provided with a hollow filter section 9. The filter section 9 and the top cover 201 are integrally formed. The filter section 9 is provided with a detachable filter assembly 5. The detachable structure makes it easy to disassemble the filter assembly 5, thereby making it easier to clean the dirt inside. The top cover 201 forms a filter air chamber 207 that communicates with the filter section 9. The filter air chamber 207 is connected to the second air duct 203. The filter air chamber 207 is only connected to the second air duct 203 and not to the first air duct 202. The main function of the filter air chamber 207 is to draw the gas filtered by the filter assembly 5 upward and let it enter the second air duct 203 for discharge.

[0031] like Figure 13-16 As shown: The first air duct 202 is connected to the external air duct 3 through the air inlet 205, and its other end is connected to the filter section 9 through a long air box 208 set below the top cover 201. The long air box 208 is integrally formed below the top cover 201. A long slot is formed in the long air box 208 to connect the filter section 9 and the external air duct 3. Sewage, impurities or gas enter the filter section 9 from the long slot and then flow into the sewage tank 2.

[0032] like Figure 17-18 As shown, the filter assembly 5 includes a filter frame 501 and a filter barrel 502 for confining the filter frame 501 within the filter section 9. The filter barrel 502 has a cavity, within which a filter element 503 is disposed. The filter barrel 502 has several filter openings 504 corresponding to the outer surface of the filter element 503. Specifically, airflow passes through the filter openings 504 on the filter barrel 502, is filtered by the filter element 503, and solid contaminants are trapped. The preliminarily purified air enters the filter air chamber 207 and then flows into the second air duct 203.

[0033] like Figure 19 As shown: A hook 401 is provided below the filter section 9, and a locking part 505 is provided on both sides of the filter barrel 502. The locking part 505 is integrally formed on both sides of the top of the filter barrel 502. A locking groove 506 is provided on the locking part 505 to cooperate with the hook 401 for limiting. Rotating the filter barrel 502 controls the engagement and disengagement relationship between the hook 401 and the locking groove 506 to install or remove the filter barrel 502.

[0034] like Figure 18 As shown: an upper stop bar 507 is formed on one side of the locking groove 506. A limiting groove 508 is provided on the upper stop bar 507. A protruding end 402 that matches the limiting groove 508 is provided on the hook 401. Rotating the filter barrel 502 realizes the engagement and disengagement of the limiting groove 508 and the protruding end 402.

[0035] The filter assembly 5 is secured by a rotating snap-fit ​​mechanism. The filter canister 502 has locking parts 505 on both sides, with locking grooves 506 on each. A hook 401 is located below the filter section 9. During installation, the filter canister 502 is placed into the filter section 9, and then rotated at a certain angle. The hook 401 slides into the locking groove 506 and is locked in place by the engagement of the protrusion 402 with the limiting groove 508. During disassembly, the filter canister 502 is rotated in the opposite direction, and the hook 401 disengages from the locking groove 506, allowing the filter assembly to be removed for cleaning. This process requires no tools and can be completed by hand, making it very convenient.

[0036] like Figure 12-14 As shown: The external air duct 3 includes an outer pipe 301 installed on one side of the equipment body 1 for connecting the brush head and an inner pipe 302 set inside the equipment body 1. One end of the inner pipe 302 is connected to the outer pipe 301, and the other end extends into the air inlet 102 for connecting the first air duct 202.

[0037] like Figure 13-14 As shown: The top cover 201 is detachably mounted on the sewage tank 2 via a snap-fit ​​mechanism. The top cover 201 consists of a base and a top cover, forming a sealed air duct inside. The snap-fit ​​mechanism includes a push-button switch 7. The top cover 201 has a movable position 20 for mounting the push-button switch 7. The bottom of the push-button switch 7 has a locking hook. The sewage tank 2 has a slot 209 that matches the locking hook. Pressing the push-button switch 7 disengages the locking hook from the slot 209 to remove the top cover 201. A return spring is also provided between the movable positions 20 of the push-button switch 7. A stop block is provided in the movable position 20. The stop block is correspondingly set with The reset spring is positioned in front of the connection end of the push switch 7. When the push switch 7 is pressed, the reset spring is in a charged state. At this time, the locking hook disengages from the slot 209, and the top cover 201 can be removed. In addition, several slots are provided along the opening of the sewage tank 2. Similarly, the top cover 201 is provided with locking ends that match these slots, so as to more stably fix the top cover 201 and the sewage tank 2. When in use, the push switch 7 is pressed to compress the reset spring, which can disengage the locking hook from the slot 209, thereby removing the top cover 201 from the sewage tank 2 for easy sewage dumping and cleaning.

[0038] The beneficial effects of this utility model are as follows: By providing an assembly slot 101 on the main body 1 for simultaneously storing a wastewater tank 2 and a clean water tank 30, and by providing viewing windows 40 on both sides of the assembly slot 101 for observing the contents of the assembly slot 101, when the wastewater tank 2 and the clean water tank 30 are installed in the assembly slot 101, the viewing windows 40 allow the users to directly observe the water levels of the wastewater tank 2 and the clean water tank 30 without having to remove the sealing cap on the wastewater tank 2 for observation. This solves the technical problem that existing vacuum cleaners cannot directly observe the water levels of the wastewater tank 2 and the clean water tank 30. Furthermore, by providing an assembly slot 101 that can simultaneously accommodate the wastewater tank 2 and the clean water tank 30, the entire device becomes more compact and aesthetically pleasing, reducing its size. The viewing windows 40 on both sides of the assembly slot 101 allow for direct and simultaneous observation of the water levels of the wastewater tank 2 and the clean water tank 30, solving the technical problem that existing vacuum cleaners are bulky and the water levels of the wastewater tank and the clean water tank cannot be observed.

[0039] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A vacuum cleaner with a viewing window, comprising a main body (1), a wastewater tank (2), and a clean water tank (30), characterized in that: The main body (1) of the equipment is provided with an assembly slot (101) for simultaneously installing a sewage tank (2) and a clean water tank (30). The main body (1) of the equipment is provided with a viewing window (40) through which the water level lines of the sewage tank (2) and / or the clean water tank (30) can be observed.

2. A vacuum cleaner with a viewing window according to claim 1, characterized in that: The viewing window (40) is located on the main body of the device (1) and corresponds to both sides of the assembly slot (101). A transparent baffle (50) is provided at the viewing window (40).

3. A vacuum cleaner with a viewing window according to claim 2, characterized in that: The transparent baffle (50) includes an outer frame fixedly installed within the viewing window (40) and a glass or transparent plastic panel enclosing and fixed within the outer frame.

4. A vacuum cleaner with a viewing window according to any one of claims 1-3, characterized in that: The assembly slot (101) is provided with an air inlet (102) for connecting an external air duct (3) and an air outlet (103) for connecting the suction end of a suction motor (4). The sewage tank (2) is equipped with a top cover (201). The top cover (201) has a first air duct (202) and a second air duct (203). When the sewage tank (2) is installed in the assembly slot (101), the first air duct (202) and the second air duct (203) are respectively connected to the air inlet (102) and the air outlet (103).

5. A vacuum cleaner with a viewing window according to claim 4, characterized in that: A positioning part (204) is formed on one side of the top cover (201) and extends laterally relative to the sewage tank (2). The bottom of the positioning part (204) is provided with an air inlet (205) and an air outlet (206) that are respectively connected to the first air duct (202) and the second air duct (203). A positioning groove (104) matching the positioning part (204) is formed on one side of the assembly groove (101). The air inlet (102) and the air outlet (103) are located on both sides of the positioning groove (104).

6. A vacuum cleaner with a viewing window according to claim 4, characterized in that: The bottom of the suction motor (4) is provided with an exhaust seat (6), and the exhaust seat (6) is provided with an air outlet groove (601) that is connected to the exhaust end of the suction motor (4). The bottom of the main body of the equipment (1) is provided with a purification air groove (105) corresponding to the position of the air outlet groove (601).

7. A vacuum cleaner with a viewing window according to claim 5, characterized in that: The bottom of the top cover (201) is provided with an internally hollow filter section (9), and the filter section (9) is provided with a detachable filter assembly (5). The top cover (201) has a filter air chamber (207) that communicates with the filter section (9), and the filter air chamber (207) is connected to the second air duct (203).

8. A vacuum cleaner with a viewing window according to claim 7, characterized in that: The first air duct (202) is connected to the external air duct (3) through the air inlet (205), and its other end is connected to the filter section (9) through a long air box (208) located below the top cover (201).

9. A vacuum cleaner with a viewing window according to claim 7, characterized in that: The filter assembly (5) includes a filter frame (501) and a filter barrel (502) for limiting the filter frame (501) in the filter section (9). The filter barrel (502) has a cavity, and a filter element (503) is provided in the cavity. The filter barrel (502) has a plurality of filter ports (504) on the outer surface of the filter element (503).

10. A vacuum cleaner with a viewing window according to claim 4, characterized in that: The external air duct (3) includes an outer tube (301) installed on one side of the equipment body (1) for connecting the brush head and an inner tube (302) disposed inside the equipment body (1). One end of the inner tube (302) is connected to the outer tube (301), and the other end extends into the air inlet (102) for connecting the first air duct (202).

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