An air outlet cover of a range hood

Abstract

An air outlet cover of an extractor hood comprises a cover body and a connecting ring mounted on the top of the cover body, an inner circumferential wall of the cover body is provided with locking buckles at the upper portion, the locking buckles are distributed along the circumferential direction of the inner circumferential wall of the cover body, the outer circumferential wall of the connecting ring is provided with buckles matched with the locking buckles, the connecting ring is in rotational locking cooperation with the cover body, the buckle has an anti-loosening convex rib and a limiting rib, along the direction of the buckle, the anti-loosening convex rib is arranged at the front side of the limiting rib, the locking buckle has an anti-loosening stop rib, in the assembled state of the connecting ring and the cover body, the anti-loosening stop rib is limited between the anti-loosening convex rib and the limiting rib. The connecting ring and the cover body of the air outlet cover adopt a rotational locking cooperation structure, without the need of screw fixing, which is convenient for after-sales installation and disassembly, when the connecting ring is rotationally fixed in place, the limiting rib of the connecting ring is in contact with the front end of the locking buckle of the air outlet cover, preventing the connecting ring from further rotating, the anti-loosening stop rib of the air outlet cover is between the limiting rib of the connecting ring and the anti-loosening convex rib of the connecting ring, preventing the connecting ring from counterclockwise rotating and loosening under the action of a small external force.

Description

Technical Field

[0001] This invention relates to an exhaust hood, and more particularly to an exhaust hood for a range hood. Background Technology

[0002] Currently, most residential apartment buildings use shared ventilation ducts. The fumes from each household's range hood enter the shared duct and are then discharged from the top of the building. If the range hood's exhaust vent is not properly sealed, fumes from lower-floor residents can enter the rooms of upper-floor residents during exhaust. Alternatively, during strong winds or low air pressure, fumes from upper-floor residents can also enter the rooms of lower-floor residents through the exhaust vents of their range hoods, resulting in cross-contamination of air and smoke between ducts. To address this, existing range hoods are equipped with backflow preventers. These hoods typically include a hood body, a connecting ring, a valve mounting shaft, and the backflow preventer. The connecting ring includes a mounting section and a flue pipe connection section located above the mounting section. The lower end of the mounting section extends into and is fixed to the hood body. The flue pipe connection section is used to install the flue pipe, and the backflow preventer is mounted on the valve mounting shaft. When closed, the valve plate completely covers the range hood's exhaust vent. When the range hood is working, the valve plate opens the vent to allow air to escape. When the range hood is not working, the blades close due to their own weight, and the valve plate rests on the hood to form a seal, preventing backflow of fumes from the common flue outside the exhaust vent. Currently, when installing the exhaust pipe, the vent pipe is first secured with two screws, and then sealed with sealing tape. However, due to the obstruction of cabinets in the user's home, installers often have to drill holes at random locations, which does not match the designed screw positions, posing a risk of screw detachment and oil leakage. Furthermore, the mating surfaces of the exhaust hood and the connecting ring use an interference fit, which, due to the siphon effect, allows oil to creep along the gaps to the outside of the exhaust hood, causing oil leakage. In conclusion, the existing exhaust hood structure of range hoods needs further improvement. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an exhaust hood for a range hood that is fixed by rotational locking between the hood and the connecting ring and has an anti-loosening structure, in light of the above-mentioned existing technology.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the exhaust hood of the range hood includes a hood body and a connecting ring installed on the top of the hood body, characterized in that: a locking buckle is provided on the upper part of the inner peripheral wall of the hood body, the locking buckles are distributed circumferentially along the inner peripheral wall of the hood body, and a buckle that cooperates with the locking buckle is provided on the outer peripheral wall of the connecting ring. The connecting ring is rotatably locked with the hood body, the buckle has an anti-loosening rib and a limiting rib. Along the snapping direction of the buckle, the anti-loosening rib is located in front of the limiting rib, and the locking buckle has an anti-loosening stop rib. When the connecting ring is assembled with the hood body, the anti-loosening stop rib is limited between the anti-loosening rib and the limiting rib.

[0005] Preferably, the bottom of the locking buckle has a downwardly protruding anti-loosening rib. During the assembly of the connecting ring, the anti-loosening rib crosses the anti-loosening rib and is confined between the anti-loosening rib and the confining rib. Thus, after assembly, the anti-loosening rib is confined between the anti-loosening rib and the confining rib to form an anti-loosening structure, which can prevent the connecting ring from loosening under small external forces.

[0006] In order for the locking buckle to be engaged in the connecting ring, the connecting ring has a lower connecting part and an upper connecting part. The diameter of the upper connecting part is larger than that of the lower connecting part. The buckles are spaced apart on the outer peripheral wall of the lower connecting part. A groove is formed between the buckle and the bottom of the upper connecting part. When the connecting ring is assembled with the cover, the locking buckle is engaged in the groove.

[0007] To facilitate the smooth rotation of the air outlet cover locking buckle into the buckle of the connecting ring, the front end of the buckle is provided with a guide structure to facilitate the locking buckle's engagement.

[0008] To ensure the connecting ring gradually locks during rotation, the top of the buckle is a sloping surface that slopes downwards from the inside out. The width of the locking buckle gradually widens along the rotation direction of the connecting ring, and the gap between the locking buckle and the sloping surface gradually decreases during assembly. Therefore, when the connecting ring is fully locked in place, an interference fit is achieved between the buckle and the locking buckle, making the locking structure more robust.

[0009] Further preferably, the cover and the connecting ring have mutually mating sealing surfaces.

[0010] To prevent oil leakage, the sealing surface includes an upper sealing surface and a lower sealing surface, with an oil creep gap formed between them. This design prevents oil from seeping from the lower sealing surface to the upper sealing surface and overflowing.

[0011] Further preferably, the inside of the cover has an oil drain port, and the oil creep gap is connected to the oil drain port.

[0012] To make the positions of the locking buckle and the drain port more reasonable, the drain port corresponds one-to-one with the locking buckle, and the drain port is located below the corresponding locking buckle.

[0013] To ensure that the locking buckles can quickly engage with the slots when the connecting ring is installed in different orientations, the number of buckles is greater than the number of locking buckles, and the buckles are evenly distributed along the outer peripheral wall of the connecting ring, while the locking buckles are evenly distributed along the circumferential direction of the cover.

[0014] To achieve the backflow prevention function, preferably, the air outlet cover also includes a backflow prevention valve, which is installed inside the connecting ring.

[0015] To facilitate connection with smaller flue pipes of different sizes, a retaining ring is installed on the top of the connecting ring, and an adapter ring for installing the flue pipe is installed between the retaining ring and the connecting ring. For larger flue pipes, the adapter ring can be omitted, and the flue pipe can be directly fixed to the retaining ring.

[0016] Compared with the prior art, the advantages of the present invention are as follows: the upper part of the inner peripheral wall of the exhaust hood of the range hood is provided with a locking buckle protruding inward, and the outer peripheral wall of the connecting ring is provided with a buckle that cooperates with the locking buckle. The connecting ring and the hood adopt a rotating locking fit structure, which does not require screw fixation, making it convenient for after-sales installation and disassembly. When the connecting ring is rotated and fixed in place, the limiting rib of the connecting ring contacts the front end of the locking buckle of the exhaust hood to prevent the connecting ring from rotating further. The anti-loosening baffle of the exhaust hood is located between the limiting rib of the connecting ring and the anti-loosening protrusion of the connecting ring, preventing the connecting ring from rotating counterclockwise and loosening under a small external force. That is, a large force is required for counterclockwise disassembly so that the connecting ring can be removed from the hood. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the air outlet hood according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 An exploded view of the air outlet shroud shown.

[0019] Figure 3 This is a front view of the connecting ring of the air outlet cover according to an embodiment of the present invention;

[0020] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0021] Figure 5 This is a top view of the hood of the air outlet according to an embodiment of the present invention;

[0022] Figure 6 A cross-sectional view of the air outlet hood assembly structure according to an embodiment of the present invention;

[0023] Figure 7 for Figure 6 Enlarged schematic diagram of part B in the middle;

[0024] Figure 8 This is a cross-sectional view of the air outlet cover in the assembly start state according to an embodiment of the present invention;

[0025] Figure 9 for Figure 8 An enlarged schematic diagram of section C;

[0026] Figure 10 This is a cross-sectional view of the air outlet cover in the assembled state according to an embodiment of the present invention;

[0027] Figure 11 for Figure 10 An enlarged schematic diagram of section D in the middle;

[0028] Figure 12 This is another structural cross-sectional view of the air outlet cover in the assembled state according to an embodiment of the present invention;

[0029] Figure 13 for Figure 12 An enlarged schematic diagram of section E in the middle. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1 to 5 As shown, the exhaust hood of this embodiment includes a hood body 1, a connecting ring 2, a check valve 3, a limiting ring 4, and an adapter ring 5. The lower part of the connecting ring 2 is mounted on the hood body 1, the check valve 3 is mounted inside the connecting ring 2, the limiting ring 4 is mounted on the top of the connecting ring 2, and the adapter ring 5 is mounted between the limiting ring 4 and the connecting ring 2. The adapter ring 5 is an optional part. For larger flue pipes, the adapter ring can be omitted, and the flue pipe can be directly fixed to the limiting ring 4. For smaller flue pipes, the flue pipe is fixed to the adapter ring 5.

[0032] A locking buckle 11 is provided protruding inward from the upper part of the inner peripheral wall of the cover 1. The locking buckles 11 are distributed circumferentially along the inner peripheral wall of the cover 1. In this embodiment, there are 4 locking buckles 11 and they are evenly distributed circumferentially. There are 4 oil drain ports 12 inside the cover 1 and they are correspondingly arranged below the locking ports 11.

[0033] In this embodiment, the connecting ring 2 has a lower connecting portion 22 and an upper connecting portion 23, the diameter of which is larger than that of the lower connecting portion 22. The outer peripheral wall of the lower connecting portion 22 is provided with latches 21 that cooperate with locking buckles 11. The number of latches 21 is greater than the number of locking buckles 11, and the latches 21 are evenly distributed along the outer peripheral wall of the connecting ring 2. In this embodiment, there are 12 latches 21. With multiple latches 21, the connecting ring 2 can be quickly rotated and assembled onto the cover 1 in multiple different positions, making installation more convenient.

[0034] like Figures 8 to 13 As shown, the connecting ring 2 and the cover 1 are locked together by a rotation, so as to... Figure 8The direction indicated by the middle arrow F is clockwise. During installation, the connecting ring 2 rotates clockwise relative to the cover 1; during disassembly, the connecting ring 2 rotates counterclockwise relative to the cover 1. In the clockwise rotation direction of the connecting ring 2, the rear end of the buckle 21 has an anti-loosening rib 211 and a limiting rib 212, with the anti-loosening rib 211 located in front of the limiting rib 212. The front end of the buckle 21 has a guide structure 213 to facilitate the locking buckle 11's engagement. In this embodiment, the guide structure 213 is a guide slope. A groove 24 is formed between the buckle 21 and the bottom of the upper connecting part 23. The bottom of the locking buckle 11 has an anti-loosening rib 111 protruding downwards. Figure 8 and Figure 9 As shown, in the initial assembly state of the connecting ring 2, the locking buckle 11 of the cover 1 is located outside the buckle 21 of the connecting ring 2. During the assembly process, the connecting ring 2 rotates clockwise relative to the cover 1, and the locking buckle 11 enters the slot 24. The anti-loosening rib 111 of the locking port 11 crosses the anti-loosening protrusion rib 211. After assembly, the anti-loosening rib 111 is limited between the anti-loosening protrusion rib 211 and the limiting rib 212, preventing the connecting ring 2 from rotating counterclockwise and loosening under a small external force. A larger force is required for counterclockwise disassembly so that the connecting ring 2 can be removed from the cover 1. The limiting rib 212 contacts the front end of the locking buckle 11 to prevent the connecting ring 2 from rotating further.

[0035] In this embodiment, the top of the buckle 21 is a sloping surface 214 that slopes downward from the inside to the outside. The width of the locking buckle 11 gradually widens along the rotation direction of the connecting ring 2. Thus, during the assembly of the connecting ring 2, the gap between the locking buckle 11 and the sloping surface 214 gradually decreases. When the connecting ring 2 is rotated and locked in place, the buckle 21 and the locking buckle 11 achieve an interference fit, making the locking structure more secure.

[0036] like Figure 6 and Figure 7 As shown, the cover 1 and the connecting ring 2 have mutually mating sealing surfaces. Specifically, the sealing surfaces include an upper sealing surface 6 and a lower sealing surface 7. An oil creep gap 8 is formed between the upper sealing surface 6 and the lower sealing surface 7. The oil creep gap 8 is connected to the oil drain port 12, forming an oil flow channel. The oil creep gap is designed to be greater than 5mm, and the oil creep height is designed to be greater than 25mm, which can effectively prevent oil from seeping from the lower sealing surface 6 to the upper sealing surface 7 and overflowing.

[0037] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. An air outlet cover of a range hood, comprising a cover body (1) and a connecting ring (2) mounted on the top of the cover body (1), characterized in that: The inner circumferential wall upper portion of the cover body (1) is inwardly provided with locking buckles (11) which are circumferentially spaced along the inner circumferential wall of the cover body (1), the outer circumferential wall of the connecting ring (2) is provided with buckles (21) matched with the locking buckles (11), the connecting ring (2) is in rotational locking cooperation with the cover body (1), the buckle (21) has an anti-loosening convex rib (211) and a limiting rib (212), along the buckle (21) insertion direction, the anti-loosening convex rib (211) is arranged on the front side of the limiting rib (212), the locking buckle (11) has an anti-loosening stop rib (111), in the state that the connecting ring (2) is assembled with the cover body (1), the anti-loosening stop rib (111) is limited between the anti-loosening convex rib (211) and the limiting rib (212), the top of the buckle (21) is a slope surface (214) which is inclined downward from inside to outside, the width of the locking buckle (11) gradually increases along the rotation direction of the connecting ring (2), during the assembly of the connecting ring (2), the gap between the locking buckle (11) and the slope surface (214) gradually decreases, the cover body (1) and the connecting ring (2) have mutual cooperation sealing surfaces.

2. The air deflector of claim 1, wherein: The bottom of the locking buckle (11) is downwardly provided with the anti-loosening stop rib (111), during the assembly of the connecting ring (2), the anti-loosening stop rib (111) is limited between the anti-loosening convex rib (211) and the limiting rib (212) by crossing the anti-loosening convex rib (211).

3. The air deflector of claim 1, wherein: The connecting ring (2) has a lower connecting portion (22) and an upper connecting portion (23), the caliber of the upper connecting portion (23) is larger than that of the lower connecting portion (22), the buckles (21) are spaced on the outer circumferential wall of the lower connecting portion (22), a buckle groove (24) is formed between the buckle (21) and the bottom of the upper connecting portion (23), in the state that the connecting ring (2) is assembled with the cover body (1), the locking buckle (11) is buckled into the buckle groove (24).

4. The air deflector of claim 1, wherein: The front end of the buckle (21) is provided with a guide structure (213) for facilitating the buckling of the locking buckle (11).

5. The air deflector of claim 1, wherein: The sealing surfaces include an upper sealing surface (6) and a lower sealing surface (7), an oil climbing gap (8) is formed between the upper sealing surface (6) and the lower sealing surface (7).

6. The air deflector of claim 5, wherein: The inside of the cover body (1) is provided with an oil discharge port (12), the oil climbing gap (8) is in communication with the oil discharge port (12).

7. The air deflector of claim 6, wherein: The oil discharge port (12) corresponds to the locking buckle (11) one by one, and the oil discharge port (12) is arranged below the corresponding locking buckle (11).

8. The air deflector of any one of claims 1-7, wherein: The number of the buckles (21) is greater than that of the locking buckles (11), and the buckles (21) are uniformly spaced along the outer circumferential wall of the connecting ring (2), and the locking buckles (11) are uniformly spaced along the circumference of the cover body (1).

9. The air deflector of claim 1, wherein: A check valve (3) is further included, which is installed inside the connecting ring (2).

10. The air deflector of claim 1, wherein: A limiting ring (4) is installed on the top of the connecting ring (2), and an adapter ring (5) for installing a smoke pipe is installed between the limiting ring (4) and the connecting ring (2).

Images