CN212930134U - Air outlet cover for range hood - Google Patents

Abstract

The air outlet cover comprises a cover body, a first blade, a second blade and a flow guide structure, wherein an air outlet channel is formed on the cover body, the first blade and the second blade are respectively in pivot connection with the cover body, the first blade and the second blade can rotate to a closing position for closing the air outlet channel, and the first blade and the second blade can also rotate to an opening position for opening the air outlet channel; the flow guiding structure is used for reducing the wind resistance of the first blade and/or the second blade, so that the wind noise caused by the first blade and/or the second blade is reduced. The air outlet cover with the structure can effectively reduce wind noise and mechanical noise, and improves the use experience of users.

Description

Air outlet cover for range hood

Technical Field

The utility model belongs to the technical field of kitchen equipment, specifically provide an air-out cover for smoke ventilator.

Background

The range hood is a kitchen appliance for purifying the kitchen environment, is arranged above a kitchen range and is used for collecting burning waste and oil fume which is harmful to human bodies and is generated in the cooking process, and discharging the waste and the oil fume to the outside so as to achieve the purpose of purifying indoor air.

In order to prevent the foreign matters from falling into the range hood, an air outlet cover is usually arranged at the air outlet end of the range hood. The air outlet cover is closed under the normal state and is opened when the range hood works.

The existing air outlet cover is generally of a double-blade type, and specifically, the existing air outlet cover generally comprises a cover body connected with a machine shell for absorbing oil smoke, a rotating shaft arranged on the cover body, and a first blade and a second blade which are pivotally connected with the rotating shaft. After the air-out cover is opened, the free end of two blades all keeps away from the cover body, is formed with the gap between the pivot end of two blades, and the air current can produce wind noise when passing through this gap at a high speed, can lead to two blades to take place the vibration simultaneously, produces the noise. Furthermore, in the long-term use process, the oil smoke can be attached to two blades (mainly the inner sides of the blades) to form oil stains, and the oil stains can flow to the joint between the blades and the cover body after the blades are closed, so that the blades and the cover body are bonded, and the opening of the blades is not facilitated.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems in the prior art, that is, to solve the problem of wind noise generated between two blades of the existing air outlet housing when the range hood works, the present disclosure provides an air outlet housing for a range hood, which includes a housing body, a first blade, a second blade and a flow guide structure, wherein an air outlet channel is formed on the housing body, the first blade and the second blade are respectively pivotally connected to the housing body, and can rotate to a closing position for closing the air outlet channel, and the first blade and the second blade can also rotate to an opening position for opening the air outlet channel; the flow guide structure is used for reducing the wind resistance of the first blade and/or the second blade, so that the wind noise caused by the first blade and/or the second blade is reduced.

Optionally, the air outlet cover further comprises a rotating shaft, and the first blade and the second blade are pivotally connected to the cover body through the rotating shaft respectively; at least one of the first blade and the second blade is provided with the flow guide structure; the flow guide structure is arranged into a semi-circular structure, and the semi-circular structure is arranged to be wrapped on the outer side of the rotating shaft and has a gap with the rotating shaft.

Optionally, the flow guiding structure includes a first flow guiding structure disposed on the first blade and a second flow guiding structure disposed on the second blade; the first flow guiding structure is configured to wrap a part of the rotating shaft in the axial direction of the rotating shaft, and the second flow guiding structure is configured to wrap another part of the rotating shaft in the axial direction of the rotating shaft.

Optionally, a first yielding groove matched with the second flow guiding structure is arranged on the pivoting end of the first blade, a second yielding groove matched with the first flow guiding structure is arranged on the pivoting end of the second blade, the first yielding groove is turned over to the upper side of the second flow guiding structure when the first blade and the second blade are both in the opening position, one end surface of the first yielding groove is located in the tangential direction of the second flow guiding structure, the second yielding groove is turned over to the upper side of the first flow guiding structure, and one end surface of the second yielding groove is located in the tangential direction of the first flow guiding structure, so that a streamline structure is formed at the joint between the first blade and the second blade.

Optionally, a first sealing strip is disposed on an outer peripheral surface of the first flow guide structure, the first sealing strip is disposed along an axial direction of the first flow guide structure, a second sealing strip is disposed on an outer peripheral surface of the second flow guide structure, the second sealing strip is disposed along an axial direction of the second flow guide structure, when the first blade and the second blade are both in the closed position, the first sealing strip abuts against a side wall of the second abdicating groove, and the second sealing strip abuts against a side wall of the first abdicating groove.

Optionally, the air outlet cover further comprises a rotating shaft, and the first blade and the second blade are pivotally connected to the cover body through the rotating shaft respectively; the flow guide structure is fixedly connected with the cover body or integrally manufactured, and the flow guide structure is positioned below the rotating shaft; the diversion structure is a V-shaped or U-shaped diversion cover.

Optionally, a first extending portion and a first avoiding portion are arranged at one end of the first blade close to the second blade, a second extending portion and a second avoiding portion are arranged at one end of the second blade close to the first blade, the first extending portion is matched with the second avoiding portion, and the second extending portion is matched with the first avoiding portion; the first extending part and the second extending part are respectively provided with a clamping groove, and the first avoiding part and the second avoiding part are respectively provided with a clamping hook; when the first blade and the second blade are both in the closed position, the hook is inserted into the slot, so that the first blade and the second blade are in sealed contact with each other.

Optionally, at least one of the first blade and the second blade is provided with a limiting structure, and the limiting structure is used for enabling the first blade and the second blade in the opening position to be in a V shape.

Optionally, the position-limiting structure includes a first position-limiting pillar disposed on an outer side surface of the first blade and a second position-limiting pillar disposed on an outer side surface of the second blade, and the first position-limiting pillar and the second position-limiting pillar are configured such that the second position-limiting pillar abuts against the first blade in a state where the first position-limiting pillar abuts against the second blade.

Optionally, the first vane in the closed position is configured to be inclined downwardly in a direction from its pivot end to its free end; the second vane in the closed position is configured to be downwardly inclined in a direction from its pivot end to its free end.

Based on the foregoing description, it can be understood by those skilled in the art that the air outlet cover of the present disclosure has at least the following beneficial effects:

1. through setting up the water conservancy diversion structure, reduce the windage of first blade and/or second blade, and then reduced the wind noise that first blade and/or second blade arouse.

2. Through set up the water conservancy diversion structure on at least one in first blade and second blade to set the water conservancy diversion structure to the semicircle structure, and make the semicircle structure parcel in the outside of pivot, make the water conservancy diversion structure can lead to two blades on with the air current that blows to first blade and second blade linking department through its semicircle structure, thereby avoided the air current to pass at a high speed from linking department between first blade and the second blade. Furthermore, a gap is formed between the flow guide structure and the rotating shaft, so that the flow guide structure can ensure normal rotation and opening and closing of the two blades on the premise of having the flow guide effect.

3. The guide structure is set into the first guide structure and the second guide structure, the first guide structure is arranged on the first blade, the second guide structure is arranged on the second blade, the first guide structure wraps one part of the rotating shaft, the second guide structure wraps the other part of the rotating shaft, the rotating shaft can be completely wrapped by the guide structure, and a gap between the two blades is avoided.

4. A first abdicating groove matched with the second flow guide structure is arranged on the pivoting end of the first blade, a second abdicating groove matched with the first flow guide structure is arranged on the pivoting end of the second blade, and the first abdicating groove can be turned over to the upper part of the second flow guide structure, so that one end face of the first abdicating groove is positioned in the tangential direction of the second flow guide structure; make the second groove of stepping down can overturn to the top of first water conservancy diversion structure to make a terminal surface in the second groove of stepping down be located the tangential direction of first water conservancy diversion structure, so that make the linking department between first blade and the second blade can form streamlined structure, thereby make the air can flow the side of two blades unimpeded, avoid two blades to take place the vibration, produce the noise.

5. Through setting up first sealing strip on the outer peripheral face of first water conservancy diversion structure, set up the second sealing strip on the outer peripheral face of second water conservancy diversion structure for when two blades were closed, the lateral wall butt in first sealing strip and the second groove of stepping down, the lateral wall butt in second sealing strip and the first groove of stepping down, thereby make out the fan housing and can be sealed totally by two blades, prevent that external oil smoke from flowing backward in the fan housing.

6. The guide cover is arranged in a V-shaped or U-shaped manner, so that the guide cover can divide the air flow blowing to the guide cover into two parts and guide the two parts to the first blade and the second blade respectively, and the air flow is prevented from flowing through a gap between the two blades to generate wind noise.

7. Through set up draw-in groove and trip on first blade and second blade respectively for first blade and second blade after closing can be through gomphosis draw-in groove and trip together sealed butt joint together, thereby make out the fan housing and can be sealed completely by two blades, prevent that external oil smoke from flowing backward into out in the fan housing.

8. Through set up limit structure on at least one in first blade and second blade for limit structure can make the first blade and the second blade that are in the open position be the V font, and the guide air current flows to the external world, prevents the turbulent phenomenon.

9. By having the first and second vanes in the closed position slope downwardly along the pivot end toward the free end, oil adhered to the first and second vanes can flow onto the cover body and then into the range hood through the cover body.

Drawings

Some embodiments of the disclosure are described below with reference to the accompanying drawings, in which:

fig. 1 is an exploded view of an air outlet housing in a first embodiment of the present disclosure;

fig. 2 is a sectional view of the wind outlet cover in a fully opened state in the first embodiment of the present disclosure;

FIG. 3 is a schematic view of the effect of a blade in a second embodiment of the disclosure;

fig. 4 is a sectional view of the wind outlet cover in a fully opened state in the second embodiment of the present disclosure;

FIG. 5.1 is an enlarged view of section A of FIG. 4 (with the vanes in a fully open condition);

FIG. 5.2 is an enlarged view of portion A of FIG. 4 (with the vanes in a half-open condition);

FIG. 5.3 is an enlarged view of section A of FIG. 4 (with the vanes in a fully closed condition);

FIG. 6 is a schematic view of the effect of a blade in a third embodiment of the disclosure;

fig. 7 is a sectional view of the outlet housing in a closed state according to a third embodiment of the present disclosure;

FIG. 8 is an enlarged view of portion B of FIG. 7;

fig. 9 is a sectional view of the wind outlet cover in a completely closed state according to the fourth embodiment of the present disclosure;

FIG. 10 is an enlarged view of section C of FIG. 9;

fig. 11 is a sectional view of the wind outlet cover in a fully opened state in the fourth embodiment of the present disclosure;

FIG. 12 is an enlarged view of portion D of FIG. 11;

FIG. 13 is an isometric view of an outlet housing in a fifth embodiment of the present disclosure;

FIG. 14 is an enlarged view of section E of FIG. 13;

fig. 15 is a cross-sectional view (without blades) of an outlet housing in a fifth embodiment of the present disclosure;

fig. 16 is an enlarged view of a portion F in fig. 15.

List of reference numerals:

1. a cover body; 11. an air outlet channel;

2. a first blade; 21. a first flow guide structure; 22. a first abdicating groove; 23. a first seal strip; 24. a first extension portion; 241. a first card slot; 25. a first avoidance portion; 26. a first oblong hole; 27. a first notch;

3. a second blade; 31. a second flow guiding structure; 32. a second abdicating groove; 33. a second seal strip; 34. a second extension portion; 35. a second avoidance portion; 351. a second hook; 36. a second oblong hole; 37. a second notch;

4. a rotating shaft;

5. a limiting structure; 51. a first limit post; 52. a second limit post;

6. a first magnet;

7. a second magnet;

8. an oil passage unit; 81. an annular groove; 82. an oil sump; 821. an oil outlet; 83. a cover; 84. a hollow column; 85. reinforcing ribs;

9. an annular member;

10. and a flow guide cover.

Detailed Description

It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present disclosure, not all of the embodiments of the present disclosure, and the part of the embodiments are intended to explain the technical principles of the present disclosure and not to limit the scope of the present disclosure. All other embodiments that can be derived by one of ordinary skill in the art based on the embodiments provided in the disclosure without inventive faculty should still fall within the scope of the disclosure.

It should be noted that in the description of the present disclosure, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as appropriate.

In a first embodiment of the present disclosure:

as shown in fig. 1 and fig. 2, the air outlet housing for the range hood of the present embodiment mainly includes a housing body 1, a first blade 2, a second blade 3, a rotating shaft 4, a limiting structure 5 and a flow guiding structure (not marked in the figures). Wherein the first blade 2 and the second blade 3 are pivotally connected to the cover 1 by a rotating shaft 4, respectively, so that the first blade 2 and the second blade 3 can be rotated to a closed position closing the cover 1 and the first blade 2 and the second blade 3 can also be rotated to an open position opening the cover 1. Furthermore, the person skilled in the art may omit the rotating shaft 4, and the first blade 2 and the second blade 3 may be directly pivotally connected to the cover 1. The limiting structure 5 is used for enabling the first blade 2 and the second blade 3 in the opening position to be in a V shape (as shown in fig. 2), so that on the premise that the airflow is allowed to flow out of the air outlet cover, the airflow can also be enabled to give enough large force to the first blade 2 and the second blade 3, and the first blade 2 and the second blade 3 are prevented from shaking repeatedly. The guide structure is used for guiding the airflow to flow to the first blade 2 and the second blade 3, and prevents the airflow from impacting the joint of the first blade 2 and the second blade 3 to form wind noise, so that the first blade 2 and the second blade 3 vibrate.

With continued reference to fig. 1 and 2, the flow guiding structure comprises a first flow guiding structure 21 arranged on the first blade 2 and a second flow guiding structure 31 arranged on the second blade 3. The stop structure 5 comprises a first stop structure 51 provided on the first blade 2 and a second stop structure 52 provided on the second blade 3.

With reference to fig. 1 and 2, an air outlet channel 11 is formed on the cover body 1, and the first blade 2 and the second blade 3 are both installed inside the air outlet channel 11. First blade 2 and second blade 3 respectively with the inside wall butt of air-out passageway 11 when closing, preferably, the circumference edge of first blade 2 and the circumference edge of second blade 3 can with the inside wall butt of air-out passageway 11 together with sealed.

With reference to fig. 1 and fig. 2, the first blade 2 is provided with a first flow guiding structure 21, a first avoiding groove 22 and a first limiting post 51. In the axial direction of the rotating shaft 4, the first guide structure 21 and the first relief groove 22 each occupy half of the first blade 2. As can be seen from the figure, the first flow guiding structure 21 is a semi-arc structure. And the semi-circular arc structure shown in fig. 2 is wrapped outside the rotating shaft 4 with a gap from the rotating shaft 4 so that the first blade 2 can rotate freely with respect to the rotating shaft 4. The first stopper post 51 is provided outside the first blade 2, and the first stopper post 51 can abut against the second blade 3.

With reference to fig. 1 and 2, the second blade 3 is provided with a second flow guiding structure 31, a second avoiding groove 32 and a second limiting post 52. In the axial direction of the rotating shaft 4, the second flow guiding structure 31 and the second relief groove 32 each occupy two halves of the second vane 3. As can be seen from the figure, the second flow guiding structure 31 is a semi-arc structure. And the semi-circular arc structure shown in fig. 3 is wrapped outside the rotating shaft 4 with a gap from the rotating shaft 4 so that the second blade 3 can freely rotate with respect to the rotating shaft 4. The second stopper column 52 is provided outside the second blade 3, and the second stopper column 52 can abut against the first blade 2.

With reference to fig. 1 and fig. 2, in an assembled state, the first flow guiding structure 21 is embedded into the second avoiding groove 32, and the second flow guiding structure 31 is embedded into the first avoiding groove 22, so that the first flow guiding structure 21 and the second flow guiding structure 31 can wrap the rotating shaft 4 together, and the rotating shaft 4 in fig. 2 is prevented from contacting with oil smoke.

It can be understood by those skilled in the art that the flow guiding structures are respectively disposed on the first blade 2 and the second blade 3 in the present embodiment, so that the two blades can be manufactured in the same structure by using a set of mold and manufacturing equipment. As an alternative embodiment of the present embodiment, a person skilled in the art may also provide a flow guiding structure on only the first blade 2 or the second blade 3, as required.

As shown in fig. 2, in a state that the first blade 2 and the second blade 3 are both in the open position, the first abdicating groove 22 is turned over above the second flow guiding structure 31, and one end surface of the first abdicating groove 22 is located in a tangential direction of the second flow guiding structure 31, the second abdicating groove 32 is turned over above the first flow guiding structure 21, and one end surface of the second abdicating groove 32 is located in a tangential direction of the first flow guiding structure 21, so that a junction of 3 between the first blade and the second blade 2 forms a streamline structure. As can be understood by those skilled in the art, the streamline structure not only has small wind resistance and does not generate wind noise, but also can divide the oil smoke blowing to the junction onto the two blades.

It can also be understood by those skilled in the art that the first limiting column 51 and the second limiting column 52 are arranged to enable the first vane 2 or the second vane 3 to be opened into a V shape through the first limiting column 51 and the second limiting column 52, so that the oil smoke flowing out from the air outlet channel 11 can act on the first vane 2 and the second vane 3, and the first vane 2 and the second vane 3 are prevented from closing and vibrating, and meanwhile, the flow rate of the flowing air can be ensured. Therefore, a person skilled in the art may also provide a limit post on only one of the first blade 2 or the second blade 3, as desired.

Based on the foregoing description, those skilled in the art can understand that in the present embodiment, the first blade 2 and the second blade 3 are respectively provided with the flow guiding structure, and the flow guiding structure is wrapped on the outer side of the rotating shaft 4, so that the rotating shaft 4 is prevented from contacting with the oil smoke, and the oil smoke is prevented from adhering to the blades on the rotating shaft 4, so that the blades cannot rotate. Meanwhile, the rotating shaft 4 is wrapped by the two flow guide structures, gaps between the two blades are avoided, and wind roaring, wind noise and vibration are avoided when airflow flows through the gaps.

In a second embodiment of the disclosure:

the present embodiment is an optimization of the first embodiment, and specifically includes the following steps:

as shown in fig. 3 to 5.3, compared with the first embodiment, the present embodiment is different in that a first sealing strip 23 (not shown in the first embodiment) is further provided on the first blade 2, and a second sealing strip 24 (not shown in the first embodiment) is further provided on the second blade 3.

As shown in fig. 3, the first seal strip 24 is provided on the outer circumferential surface of the first flow guide structure and is arranged along the axial direction of the first flow guide structure 21. A second seal strip 34 is provided on the outer peripheral surface of the second flow guide structure, and is arranged along the axial direction of the second flow guide structure 31,

as shown in fig. 5.1 and 5.2, in the state that the first blade 2 and the second blade 3 are in the open position, the first sealing strip 24 is located outside the second abdicating slot 32, and a gap is provided between the first flow guiding structure 21 and the side wall of the second abdicating slot 32, so that the first blade 2 can rotate freely relative to the second blade 3. Likewise, the second sealing strip 34 is located outside the first abdicating groove 22, and the second flow guiding structure 31 has a gap with the side wall of the first abdicating groove 22, so that the second blade 3 can rotate freely relative to the first blade 2.

As shown in fig. 5.3, in a state where the first blade 2 and the second blade 3 are both in the closed position, the first sealing strip 23 abuts against the side wall of the second avoiding groove 32, and the second sealing strip 33 abuts against the side wall of the first avoiding groove 22, so that the first blade 2 and the second blade 3 are sealingly abutted together. So that under the prerequisite of first blade 2 and second blade 3 and the lateral wall butt of air-out passageway 11 with sealed ground, make first blade 2 and second blade 3 seal air-out passageway 11 completely, prevent that external oil smoke from flowing backward into cover body 1 in.

As can be seen from fig. 5.1 to 5.3, the side walls of the first and second avoiding grooves 22 and 32 are arc-shaped, so as to ensure the reliability of the abutment between the first sealing strip 23 and the second avoiding groove 32, and the reliability of the abutment between the second sealing strip 33 and the first avoiding groove 22.

In a third embodiment of the present disclosure:

as shown in fig. 6 to 8, in the present embodiment, unlike the first embodiment, the first vane 2 of the present embodiment does not have the first flow guiding structure 21 and the first receding groove 22, but the first vane 2 is provided with the first extending portion 24 and the first receding portion 25. The second vane 3 of the present embodiment does not have the second flow guiding structure 31 and the second receding groove 32, but the second vane 3 is provided with the second extending portion 34 and the second receding portion 35.

With continued reference to fig. 6-8, the first extending portion 24 corresponds to the second avoiding portion 35, and the first avoiding portion 25 corresponds to the second extending portion 34. The first extending portion 24 is provided with a first engaging groove 241, and the second avoiding portion 35 is provided with a second engaging hook 351 matched with the first engaging groove 241. The first avoiding portion 25 is provided with a first hook (not shown), and the second extending portion 34 is provided with a second slot corresponding to the first hook.

As shown in fig. 8, under the state that first blade 2 and second blade 3 are both in the closed position, first trip is embedded into the second draw-in groove, and second trip 351 is embedded into first draw-in groove 241 to make first blade 2 and second blade 3 can seal ground butt together, so that under the prerequisite that first blade 2 and second blade 3 and the lateral wall of air-out passageway 11 seal ground butt, make first blade 2 and second blade 3 seal air-out passageway 11 completely, prevent that external oil smoke from flowing backward in the cover body 1.

In a fourth embodiment of the disclosure:

as shown in fig. 9 to 12, in the present embodiment, unlike the first embodiment, the first vane 2 of the present embodiment does not have the first flow guiding structure 21 and the first relief groove 22, but the first vane 2 is provided with the first oblong hole 26 (circular hole in the first embodiment) and the first magnet 6. The second vane 3 of this embodiment does not have the second flow guiding structure 31 and the second relief groove 32, but the second vane 3 is provided with the second oblong hole 36 (circular hole in the first embodiment) and the second magnet 7.

As shown in fig. 9, the first magnets 6 on the first blade 2 correspond one-to-one to the second magnets 7 on the second blade 2. Also, the first magnet 6 and the second magnet 7 can attract or repel each other.

As shown in fig. 9 and 10, in the closed state, the first magnet 6 and the second magnet 7 attract each other, so that the first lid 2 and the second lid 3 can be brought close to and abutted against each other, whereby sealing between the first lid 2 and the second blade 3 can be achieved. It will be appreciated by those skilled in the art that since the first oblong hole 26 and the second oblong hole 36 are horizontal in the closed state, it is possible to avoid the two vanes from shaking up and down.

As shown in fig. 11 and 12, in the open state, the first magnet 6 and the second magnet 7 repel each other, so that the first cover 2 and the second cover 3 can be away from each other, and the gap between the first cover 2 and the second cover 3 is enlarged, thereby not only avoiding the risk of collision and friction between the two blades, but also reducing the speed of air flowing through the gap (the larger the cross section of the air port is, the smaller the flow speed is on the premise of equal flow), and reducing the wind noise.

In a fifth embodiment of the present disclosure:

as shown in fig. 13 to 16, in the present embodiment, unlike the foregoing first embodiment, a flow guide structure for guiding air to the blades is provided as the nacelle 10, in other words, the first flow guide structure 21 and the second flow guide structure 31 provided on the blades are omitted and replaced with the nacelle 10. And the air outlet cover also comprises an oil way unit 8. The method comprises the following specific steps:

as shown in fig. 15, the air guide sleeve 10 has a V-shaped or U-shaped cross section and is fixedly connected to or integrally formed with the cover body 1, and the air guide sleeve 10 is located below the rotating shaft 4.

With continued reference to fig. 13 to 16, the oil passage unit 8 includes an annular groove 81, an oil sump 82, a cover 83, a hollow column 84, and a reinforcing rib 85. Wherein, the annular groove 81 is arranged at the inner side of the cover body 1, the oil collecting groove 82 is communicated with the annular groove 81, the bottom of the oil collecting groove 82 is provided with an oil outlet 821, the hollow column 84 is arranged in the oil collecting groove 82, and the hollow column 84 is aligned with and communicated with the oil outlet 821. The cover 83 fits over the top of the hollow post 84, and a gap is formed between the cover 83 and the hollow post 84 to allow oil to flow through. Under the state of closing the air outlet channel 11, the first blade 2 and the second blade 3 are respectively abutted against the top end of the side wall of the annular groove 81, so that oil stains adhered to the first blade 2 and the second blade 3 can flow into the annular groove 81 under the action of self gravity, then are gathered into the oil collecting tank 82, finally enter the hollow column 84 from a gap between the cover 83 and the hollow column 84 in a siphon mode, and finally flow out from the oil outlet 821.

With continued reference to fig. 13 to 16, the inner side of the cover 1 is provided with an annular member 9, the cross section of the annular member 9 is an L-shaped structure, and the annular member 9 and the cover 1 jointly enclose an annular groove 81. Although not specifically shown in the drawings, the bottom wall of the annular groove 81 is provided so as to be gradually inclined downward toward the oil sump 82, so that the oil dirt in the annular groove 81 can flow into the oil sump 82 by its own weight.

As shown in fig. 16, the bottom of the oil sump 82 is provided with an oil outlet 821, a hollow column 84 is provided within the oil sump 82, and the hollow column 84 is aligned with and communicates with the oil outlet 821. A reinforcement 85 is provided on the outside of the bottom of the hollow column 84, which reinforcement 85 is fixedly connected or integrally formed with the annular member 9 and/or the hollow column 84. The cover 83 is connected to the rib 85 in an interference fit manner, and thus a gap allowing oil to flow is formed between the cover 83 and the hollow column 84.

As can be seen from fig. 16, the annular groove 81 is flush with the top edge of the oil sump 82 so that the oil dirt in the annular groove 81 can smoothly flow into the oil sump 82.

As shown in fig. 6, H1 indicates the height of the bottom end of the lid 83, and H2 indicates the height of the top end of the hollow post 84.

When the annular groove 81 is contaminated with oil, the oil is gradually introduced into the oil sump 82 by gravity. The oil in the oil collecting tank 82 is accumulated continuously until the liquid level of the oil in the oil collecting tank 82 exceeds H2, and then enters the hollow column 84 under the principle of siphon and communicating vessels, and then the oil in the hollow column 84 falls into the cover body 1 through the oil outlet 821.

When no oil stain flows to the oil collecting groove 21 in the annular groove 81, the oil stain in the oil collecting groove 82 has a liquid level between H1 and H2, and thus the oil path unit 8 is sealed, so that the oil smoke from the outside can be prevented from flowing back into the cover body 1.

As shown in fig. 13, the first blade 2 is further provided with a first notch 27 aligned with the oil collecting groove 82, and the second blade 3 is provided with a second notch 37, wherein the first notch 27 and the second notch 37 can allow outside air to enter the annular groove 81, so that negative pressure does not exist in the oil collecting groove 82, and oil stains in the oil collecting groove cannot flow.

It will be appreciated by those skilled in the art that the indentations may be provided only on the first blade 2 or the second blade 3, while ensuring that the oil in the oil sump 82 is able to flow normally.

Further, although not explicitly shown in the drawings, the first vane 2 in the closed position is configured to be inclined downward in the direction from the pivot end thereof to the free end thereof, and the second vane 3 in the closed position is configured to be inclined downward in the direction from the pivot end thereof to the free end thereof, so that oil stains on the first vane 2 and the second vane 3 can rapidly flow into the annular groove 81 under the influence of their own weight.

Further, in order to allow the oil stains on the first and second blades 2 and 3 to flow into the annular groove 81, a gap is required between the tip of the annular member 9 and the first and second blades 2 and 3. Therefore, in the present embodiment, the free end of the first vane 2 in the closed position abuts against the cover 1, and the free end of the second vane 3 in the closed position also abuts against the cover 1.

Further, on the premise that the air outlet channel 11 can be opened and closed, a person skilled in the art may set two blades (the first blade 2 and the second blade 3) as one blade as needed.

So far, the technical solutions of the present disclosure have been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of the present disclosure is not limited to only these specific embodiments. The technical solutions in the above embodiments can be split and combined, and equivalent changes or substitutions can be made on related technical features by those skilled in the art without departing from the technical principles of the present disclosure, and any changes, equivalents, improvements, and the like made within the technical concept and/or technical principles of the present disclosure will fall within the protection scope of the present disclosure.

Claims (10)

1. An air outlet cover for a range hood is characterized by comprising a cover body, a first blade, a second blade and a flow guide structure,

an air outlet channel is formed on the cover body,

the first blade and the second blade are respectively and pivotally connected with the cover body, and the first blade and the second blade can rotate to a closed position for closing the air outlet channel and can also rotate to an open position for opening the air outlet channel;

the flow guide structure is used for reducing the wind resistance of the first blade and/or the second blade, so that the wind noise caused by the first blade and/or the second blade is reduced.

2. The housing of claim 1, further comprising a shaft, wherein the first and second blades are pivotally connected to the housing via the shaft;

at least one of the first blade and the second blade is provided with the flow guide structure;

the flow guide structure is arranged into a semi-circular arc structure, and the semi-circular arc structure is configured to be wrapped on the outer side of the rotating shaft and has a gap with the rotating shaft.

3. A wind outlet housing according to claim 2, wherein said flow guiding structure comprises a first flow guiding structure provided on said first blade and a second flow guiding structure provided on said second blade;

the first flow guide structure is configured to wrap a part of the rotating shaft in the axial direction of the rotating shaft, and the second flow guide structure is configured to wrap another part of the rotating shaft in the axial direction of the rotating shaft.

4. The wind outlet cover according to claim 3, wherein a first receding groove matched with the second flow guiding structure is arranged on the pivoting end of the first blade,

a second abdicating groove matched with the first flow guiding structure is arranged on the pivoting end of the second blade,

the first blade with the second blade all is in under the state of open position, first groove upset of stepping down extremely the top of second water conservancy diversion structure, and a terminal surface in first groove of stepping down is located on the tangential direction of second water conservancy diversion structure, the second groove upset of stepping down extremely the top of first water conservancy diversion structure, and a terminal surface in the second groove of stepping down is located on the tangential direction of first water conservancy diversion structure, so that first blade with linking department between the second blade forms streamlined structure.

5. An air-out housing according to claim 4, characterized in that a first sealing strip is arranged on the outer circumferential surface of the first flow guiding structure, and the first sealing strip is arranged along the axial direction of the first flow guiding structure,

a second sealing strip is arranged on the outer peripheral surface of the second flow guide structure and is arranged along the axial direction of the second flow guide structure,

the first blade with the second blade all is in under the state of closed position, first sealing strip with the lateral wall butt in second groove of stepping down, the second sealing strip with the lateral wall butt in first groove of stepping down.

6. The housing of claim 1, further comprising a shaft, wherein the first and second blades are pivotally connected to the housing via the shaft;

the flow guide structure is fixedly connected with the cover body or integrally manufactured, and the flow guide structure is positioned below the rotating shaft;

the flow guide structure is a V-shaped or U-shaped flow guide cover.

7. An air outlet cover according to claim 6, wherein a first extending portion and a first avoiding portion are provided at an end of the first blade close to the second blade, a second extending portion and a second avoiding portion are provided at an end of the second blade close to the first blade, the first extending portion is matched with the second avoiding portion, and the second extending portion is matched with the first avoiding portion;

the first extending part and the second extending part are respectively provided with a clamping groove, and the first avoiding part and the second avoiding part are respectively provided with a clamping hook;

the hook is inserted into the slot in a state where the first blade and the second blade are both in the closed position, so that the first blade and the second blade are sealingly abutted together.

8. An outlet housing according to any one of claims 1 to 7, wherein at least one of the first and second vanes is provided with a limiting structure for making the first and second vanes in the open position V-shaped.

9. An air-out housing according to claim 8, characterized in that the limiting structure comprises a first limiting post arranged on the outer side surface of the first blade and a second limiting post arranged on the outer side surface of the second blade,

the first limiting column and the second limiting column are configured to abut against the first blade when the first limiting column abuts against the second blade.

10. A hood according to any of claims 1-7, wherein the first vane in the closed position is arranged to slope downwardly in a direction from its pivot end to its free end;

the second vane in the closed position is configured to slope downwardly in a direction from its pivot end to its free end.

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