CN215570689U - Ceiling type range hood - Google Patents

Abstract

The utility model relates to a ceiling type range hood, comprising: the bottom of the smoke collecting cover is provided with a smoke collecting cavity; the smoke baffle plate is rotationally arranged below the front side of the smoke collecting cover; the smoke baffle plate has an opening state that the smoke baffle plate is unfolded relative to the smoke collecting cover so that at least part of the smoke baffle plate is positioned outside the vertical projection of the smoke collecting cavity on the horizontal plane and a folding state that the smoke baffle plate is folded relative to the smoke collecting cover in the rotating process relative to the smoke collecting cover. The smoke baffle plate arranged on the front side of the smoke collecting cover of the top-suction type range hood can be unfolded relative to the smoke collecting cover, at least part of the smoke baffle plate is positioned outside the vertical projection of the smoke collecting cavity on the horizontal plane and is obliquely arranged, therefore, under the unfolded state, the smoke baffle plate can effectively collect the oil smoke at the mouth and nose of a user and form a coanda surface at the place, airflow is forced to flow to the range hood along the inclined surface of the smoke baffle plate, certain negative pressure is formed at the place, and the oil smoke sucked into the place by the mouth and nose of the user is effectively reduced.

Description

Ceiling type range hood

Technical Field

The utility model relates to the technical field of range hoods, in particular to a top-suction type range hood.

Background

The range hood is a kitchen appliance for purifying the kitchen environment and generally comprises a side-suction range hood and a top-suction range hood. The top-suction type range hood has the advantages of being neat, light, small in occupied space and the like, so that the range hood is more and more widely applied.

At present, the integral installation height of the top-suction type range hood determines that the range hood is far away from a pot generating oil smoke, the vertical depth and the longitudinal depth of a smoke collecting cavity of the top-suction type range hood are not enough, an ideal smoke collecting effect cannot be formed, the negative pressure loss is high, and the oil smoke rising above the pot easily escapes from the two sides and the front side of a smoke collecting cover, so that the oil smoke suction effect is poor. In order to improve the effect of the range hood, people improve the structure of the range hood, wherein a fan system of the range hood is improved by a common method, for example, the power of a fan is increased, for example, the structure of an impeller is improved, and the like.

Therefore, there is a range hood that prevents the oil smoke from escaping by arranging baffles on two sides or the front side of the smoke collecting hood, for example, the chinese patent application with the application number CN201910993328.0 (publication number CN110715335A) previously applied by the present applicant discloses a range hood that includes a smoke collecting hood, a front smoke baffle, a first side smoke baffle and a second side smoke baffle, where the front smoke baffle is rotatably arranged below the front side of the smoke collecting hood and can be located at a first position extending transversely and a second position extending longitudinally; the first side keeps off the cigarette board and the second side keeps off the cigarette board and sets up in the front and keeps off both ends about the cigarette board respectively with rotating to keep off the third position that the cigarette board syntropy extended with preceding and keep off the fourth position that the cigarette board turned over respectively to collection petticoat pipe left and right sides below longitudinal extension before relatively.

However, range hood in the above-mentioned patent still has certain not enough, range hood's front side keep off the cigarette board when open mode, only in the front side longitudinal extension setting (being downwardly extending) of collection petticoat pipe, do not increase and hold together the cigarette region, so still there is the front side and holds together the insufficient problem of cigarette, and to the top suction type range hood, generally the minimum distance ground 170 ~ 180cm of its collection petticoat pipe is about, just in time be in user top position, if the front side holds together the cigarette not enough, the user can inhale the oil smoke that runs out forward, seriously influence user's use experience.

Therefore, the existing range hood needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art, and provides a top-suction type range hood which can effectively avoid the problem of oil smoke escape at the front side of a smoke collecting hood of the range hood and further reduce the oil smoke inhaled by a user through a mouth and a nose.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a ceiling-mounted range hood, comprising:

the bottom of the smoke collecting cover is provided with a smoke collecting cavity;

the smoke baffle plate is rotationally connected below the front side of the smoke collecting cover;

the smoke baffle plate has an opening state that the smoke baffle plate is unfolded relative to the smoke collecting cover so that at least part of the smoke baffle plate is positioned outside the vertical projection of the smoke collecting cavity on the horizontal plane and a folding state that the smoke baffle plate is folded relative to the smoke collecting cover in the rotating process relative to the smoke collecting cover.

In order to further avoid the oil smoke from escaping at the smoke blocking position, in an opening state, the smoke blocking plate inclines forwards from top to bottom, the inclination angle of the smoke blocking plate and a vertical plane is A, and A is more than or equal to 50 degrees and less than or equal to 70 degrees.

Keep off the cigarette board and can close the collection smoke chamber that also can close the collection petticoat pipe on the outer wall of collection petticoat pipe, consider for range hood's aesthetic property receive and close under the state, keep off the cigarette board and be located in the collection smoke chamber, just the lowest position that keeps off the cigarette board is higher than the lowest position of collection petticoat pipe. The structure design can prevent the smoke baffle plate folded in the smoke collection cavity from being seen by a user, and the aesthetic property of the range hood is improved.

In order to further improve the smoke gathering effect of the smoke baffle plate, the cross section of the smoke baffle plate is at least far away from one end of the smoke collecting cover is arc-shaped, and the concave surface of the smoke baffle plate faces downwards in an opening state. As a modification, the smoke barrier may have an arc-shaped cross section as a whole, and the concave surface of the smoke barrier faces downward in the opened state.

In order to make the smoke baffle stably and firmly keep in a corresponding overturning angle state after the smoke collecting hood is overturned in place, the smoke collecting hood further comprises a rotary connecting mechanism for connecting the smoke collecting hood with the smoke baffle, and the rotary connecting mechanism comprises:

the connecting seat is arranged on the smoke collecting cover and is provided with a rotating shaft hole;

the rotating shaft support comprises a support body and a rotating shaft connected to the support body, the support body is connected with the smoke baffle, the rotating shaft can be rotatably arranged in the rotating shaft hole, and a positioning structure used for limiting the rotating shaft support to continue rotating after the rotating shaft support is rotated in place is arranged between the rotating shaft and the connecting seat.

The positioning structure can adopt various prior arts which can prevent the rotating shaft from continuously rotating after the rotating shaft rotates in place, and in order to better match the rotating shaft and the connecting seat and simplify the consideration of the positioning structure, the positioning structure further comprises a sliding block and an elastic piece, the sliding block is restrained on the connecting seat in a mode of being close to or far away from the rotating shaft and is propped against the peripheral surface of the rotating shaft, the peripheral surface of the rotating shaft is provided with a region which is formed by reducing the circumferential radius of the rotating shaft firstly and then increasing along the circumferential radius of the rotating shaft and is used as a positioning part to prevent the rotating shaft from continuously rotating relative to the connecting seat, the elastic piece acts on the sliding block and enables the sliding block to always have the trend of moving towards the rotating shaft, and the positioning part, the sliding block and the elastic piece of the rotating shaft jointly form the positioning structure.

In order to further simplify the positioning structure, the positioning portion of the rotating shaft is a flat surface formed on the outer circumferential surface of the rotating shaft or an arc surface formed by radially and inwardly recessing from the outer circumferential surface of the rotating shaft. Preferably, the positioning part of the rotating shaft adopts a plane structure, for example, a flat key groove can be arranged on the rotating shaft. The above structure design makes the rotation axis have obvious radius change (radius increase) from the positioning part to the peripheral surface, therefore, after the rotation axis rotates to the positioning position, if the rotation axis continues to rotate, the elastic part will be compressed, correspondingly, the force acted on the rotation axis by the slide block will be increased, therefore, the force required to be exerted to make the rotation axis continue to rotate will also be increased, therefore, the smoke baffle plate can be ensured to be stably and firmly kept in the state of the turnover angle.

In order to realize the connection of the rotating shaft and the connecting seat and arrange the sliding block to ensure the stable sliding of the sliding block, the connecting seat is provided with a strip-shaped sliding groove communicated with the rotating shaft hole, the length direction of the strip-shaped sliding groove is basically vertical to the axial direction of the rotating shaft hole, and the sliding block is arranged in the strip-shaped sliding groove in a sliding manner.

The elastic member may be a spring, and the spring is disposed in the bar-shaped sliding groove and abuts between the sliding block and the bottom wall of the bar-shaped sliding groove.

In order to avoid the spring from deviating or falling out of the strip-shaped sliding groove, one end of the sliding block, which corresponds to the spring, is provided with a positioning groove, and the end part of the spring is accommodated in the positioning groove.

In order to firmly position the smoke baffle plate at a plurality of turning angles, the number of the positioning parts is at least two, and the positioning parts are arranged at intervals along the circumferential direction of the rotating shaft.

In order to realize the positioning of the smoke baffle in the opening state and the folding state, the two positioning parts are provided, the included angle formed by the two positioning parts relative to the axis of the rotating shaft is alpha, and alpha is more than or equal to 140 degrees and less than or equal to 160 degrees. Wherein, one positioning part corresponds to the opening state of the smoke baffle plate, the other positioning part corresponds to the closing state of the smoke baffle plate, and alpha is preferably 160 degrees.

In order to ensure the firmness of the turning process of the smoke baffle, the rotary connecting mechanisms are provided with two groups which are respectively positioned at two sides of the smoke baffle in the length direction.

In order to realize the automatic opening and closing of the smoke baffle, the top suction type range hood further comprises an electric driving mechanism which is arranged on the smoke collection cover, and the power action end of the electric driving mechanism is connected with the rotating shaft so as to drive the rotating shaft to rotate around the axis of the rotating shaft. The electric drive mechanism is preferably an electric motor. Of course, it is contemplated that the electric drive mechanism described above may be omitted and the smoke barrier opened or closed manually.

Compared with the prior art, the utility model has the advantages that: the smoke baffle plate arranged on the front side of the smoke collecting cover of the top-suction type range hood can be unfolded relative to the smoke collecting cover, at least part of the smoke baffle plate is positioned outside the vertical projection of the smoke collecting cavity on the horizontal plane and is obliquely arranged, therefore, under the unfolded state, the smoke baffle plate can effectively collect the oil smoke at the mouth and nose of a user and form a coanda surface at the place, airflow is forced to flow to the range hood along the inclined surface of the smoke baffle plate, certain negative pressure is formed at the place, and the oil smoke sucked into the place by the mouth and nose of the user is effectively reduced. In the preferred scheme, keep off the cigarette board and rotate through the pivot support and locate the connecting seat on the collection petticoat pipe and be connected, wherein, dispose location structure between axis of rotation and the connecting seat, this location structure can be used for restricting the axis of rotation and continuing to rotate after rotating to target in place, thereby guaranteed to keep off the cigarette board can stably at the open mode or the state of closing of correspondence, avoid keeping off the cigarette board because of self gravity or foreign object touching takes place the skew, improved user's use and experienced. In a further preferred embodiment, the positioning structure of the rotation connecting mechanism adopts a mechanical movement limiting structure in which an elastic piece, a sliding block and a rotating shaft are matched, so that the reliability is higher, the number of related parts is less, and the assembly process is simple.

Drawings

Fig. 1 is a schematic perspective view of a range hood according to an embodiment of the present invention;

fig. 2 is a bottom view of fig. 1 (with the smoke barrier in a collapsed state);

FIG. 3 is a bottom view of FIG. 1 (with the smoke barrier in an open position);

fig. 4 is a longitudinal sectional view of the range hood according to the embodiment of the present invention (the smoke barrier is in a folded state);

fig. 5 is a longitudinal sectional view of the range hood according to the embodiment of the present invention (the smoke barrier is in an open state);

fig. 6 is a schematic perspective view of a rotary connection mechanism of a range hood according to an embodiment of the present invention and a smoke barrier in a connection state;

FIG. 7 is another angular view of FIG. 6 (with the mount omitted);

FIG. 8 is a side view of FIG. 7;

FIG. 9 is an exploded view of FIG. 7;

FIG. 10 is another angular view of FIG. 9;

FIG. 11 is a cross-sectional view of a spindle bracket according to an embodiment of the present invention;

fig. 12 is a longitudinal sectional view of the range hood according to the embodiment of the present invention (the cross section of the smoke barrier is arc);

fig. 13 is a schematic structural view of the range hood according to the embodiment of the present invention, in which the rotary connection mechanism and the smoke barrier are in a connected state (the positioning portion of the rotary shaft is a concave arc-shaped surface).

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 13, which illustrate a preferred embodiment of the present invention, the top suction type range hood includes a housing 10, a fan system 13, a smoke collecting hood 11, a smoke barrier 12, and a rotary connection mechanism. The smoke collecting cover 11 is connected to the bottom of the casing 10 and has a smoke collecting chamber 110 with a downward opening, specifically, the smoke collecting chamber 110 of the top-suction range hood is a structure gradually recessed upwards from the outer circumference of the smoke collecting cover 11 to the middle area, and an air inlet is usually arranged in the middle area of the smoke collecting chamber 110. The casing 10 is provided with a fan system 13 for generating negative pressure suction force to suck the oil smoke below the range hood into the fan, and the oil smoke is accelerated by the fan and then collected by the volute and guided to be discharged out of the room.

In order to improve the effect of absorbing oil smoke and avoid the oil smoke from escaping from the front side of the smoke collecting cover 11, a smoke baffle 12 is further arranged below the front side of the smoke collecting cover 11, and fig. 1 shows a structure that the smoke baffle 12 is arranged at the front side of the smoke collecting cover 11.

Referring to fig. 2 to 5, the smoke baffle 12 is rotatably connected to the front lower side of the smoke collecting hood 11, specifically, connected to the smoke collecting hood 11 by a rotary connection mechanism. Wherein, the smoke baffle 12 has an open state and a closed state, in the open state, the smoke baffle 12 is unfolded relative to the smoke collecting hood 11 to make at least part of the smoke baffle be positioned outside the vertical projection of the smoke collecting cavity 110 on the horizontal plane, and the smoke baffle is inclined downwards from the back to the front. Specifically, the smoke baffle 12) of the present embodiment has an inclination angle a with respect to the vertical plane, wherein 50 ° ≦ a ≦ 70 °, and a is preferably 70 °, as shown in fig. 5 in detail. In the retracted state, the smoke baffle 12 is retracted relative to the smoke collecting cover 11, specifically, may be located outside the smoke collecting chamber 110 of the smoke collecting cover 11, and retracted relative to the outer wall of the smoke collecting cover 11, or located inside the smoke collecting chamber 110, and retracted relative to the inner wall of the smoke collecting chamber 110. The latter is preferred for the aesthetic aspect of the range hood, and in the collapsed state, the lowest position of the smoke baffle 12 is higher than the lowest position of the smoke collecting hood 11, as shown in detail in fig. 4.

The smoke barrier 12 may be a flat plate structure as shown in figure 5. As a variation, the smoke barrier 12 may also be an arc-shaped cross section at least at one end far away from the smoke collecting hood 11, and the concave surface of the smoke barrier 12 faces downward in the open state, as shown in fig. 12, the smoke barrier structure can further improve the smoke collecting effect and the reverse suction effect of the smoke barrier, and effectively reduce the smoke inhaled by the mouth and nose of the user.

Referring to fig. 9, the smoke barrier 12 of the present embodiment is connected to the smoke collection hood 11 through a rotational connection mechanism. The rotation connection mechanism includes a connection base 20, a rotation shaft bracket 30, an elastic member 42, and a slider 41.

Referring to fig. 1, 2 and 6, the connecting base 20 is disposed on the fume collecting hood 11. Specifically, the fume collecting cover 11 has a sandwich (not shown), the connecting base 20 is disposed in the sandwich and connected with the fume collecting cover 11 through the fixing frame 50, and further specifically, the connecting base 20 partially penetrates through the wall of the fume collecting chamber 110 to be exposed in the fume collecting chamber 110, and the exposed portion is connected with the rotating shaft 32 of the rotating shaft support 30.

Referring to fig. 9 and 10, the rotation shaft bracket 30 includes a bracket body 31 and a rotation shaft 32 connected to the bracket body 31. The bracket body 31 is a sheet structure, is attached to the side wall of the smoke barrier 12, and is connected with the smoke barrier 12 through screws or other connecting pieces. After the smoke barrier 12 is connected to the rotation shaft support 30, the axis of the rotation shaft 32 is substantially collinear with one side edge in the length direction of the smoke barrier 12, thereby allowing the smoke barrier 12 to rotate substantially around one side edge thereof as a rotation center. On the other hand, the connecting seat 20 has a rotating shaft hole 21 exposed on the wall portion of the smoke collecting chamber 110, and the rotating shaft 32 is disposed in the rotating shaft hole 21 and can rotate around its axis.

In order to avoid the deviation of the smoke barrier 12 caused by the self gravity or the touch of foreign objects, and further ensure that the smoke barrier 12 can be stably kept in the corresponding open state or the corresponding closed state, a positioning structure for limiting the rotation of the rotating shaft 32 after the rotating shaft 32 rotates in place is further arranged between the rotating shaft 32 and the connecting seat 20.

Referring to fig. 7 and 10, the connecting seat 20 further has a strip-shaped sliding groove 22, the strip-shaped sliding groove 22 is communicated with the rotating shaft hole 21, and the length direction of the strip-shaped sliding groove 22 is substantially perpendicular to the axial direction of the rotating shaft hole 21. The strip-shaped sliding groove 22 is provided with an elastic member 42 and a sliding block 41, wherein the sliding block 41 is slidably constrained in the strip-shaped sliding groove 22 of the connecting seat 20 in a manner of approaching or separating from the rotating shaft 32, and abuts against the outer peripheral surface of the rotating shaft 32 under the action of the elastic member 42. The elastic member 42 of this embodiment is preferably a spring, wherein, in order to prevent the spring from being deflected or being released from the strip-shaped sliding slot 22, one end of the sliding block 41 facing the spring is provided with a positioning slot 410 for accommodating the end of the spring therein. In addition, for the convenience of assembling the elastic member 42 and the slider 41, the strip-shaped sliding groove 22 of the connecting seat 20 is an open groove, wherein the size of the open opening of the strip-shaped sliding groove 22 is substantially the same as the extending length of the strip-shaped sliding groove 22, and the elastic member 42 can be installed in the strip-shaped sliding groove 22 of the connecting seat 20 together from the open opening after being assembled in the positioning groove 410 of the slider 41.

The outer peripheral surface of the rotating shaft 32 of the present embodiment is mostly a circular arc surface, so that the rotating process of the rotating shaft 32 relative to the connecting seat 20 is more labor-saving. The outer circumferential surface of the rotation shaft 32 further has a region where the radius is first decreased and then increased along the circumferential direction of the rotation shaft 32, and thus serves as a positioning portion 320 to be engaged with the slider 41 to prevent the rotation shaft 32 from further rotating with respect to the connection holder 20. It is conceivable that the above-described structure of the positioning portion 320 is matched with the structure of the end portion of the slider 41, and that the slider 41 can be disengaged from the positioning portion 320 by applying a larger torsional force to the rotating shaft 32. The positioning portion 320 of the rotating shaft 32, the slider 41, and the elastic member 42 together constitute the positioning structure of the present embodiment.

The positioning portion 320 of the rotating shaft 32 of the present embodiment may be a flat surface formed on the outer circumferential surface of the rotating shaft 32, or may be an arc surface formed by being recessed radially inward from the outer circumferential surface of the rotating shaft 32. For example, fig. 11 shows a structure that the positioning portion 320 of the rotating shaft 32 is a plane, and correspondingly, the end of the slider 41 facing the rotating shaft 32 matches the shape of the positioning portion 320, so that the positioning (i.e. limiting the rotation of the rotating shaft 32) between the rotating shaft 32 and the slider 41 can be achieved, and when a larger force is applied, the slider 41 is suitable for making the compression spring of the slider 41 move reversely to achieve the rotation of the rotating shaft 32. The positioning portion 320 of the present embodiment is configured to make the radius of the rotating shaft 32 change significantly (increase the radius) from the positioning portion 320 to the outer peripheral surface, so that if the rotating shaft 32 rotates to the positioning position, the elastic member 42 is compressed, and accordingly, the force applied by the slider 41 on the rotating shaft 32 increases, and therefore, the force required to continuously rotate the rotating shaft 32 also increases, thereby ensuring that the smoke barrier 12 is stably and firmly maintained in the turned angle state. As another possible implementation manner, the positioning portion 320 of the rotating shaft 32 of the present embodiment adopts an arc surface structure formed by radially and inwardly recessing from the outer peripheral surface of the rotating shaft 32, and correspondingly, the sliding block 41 is configured as an outwardly protruding arc surface matched with the arc surface, specifically, the matching structure of the sliding block and the elastic element can adopt a wave ball screw, which is shown in detail in fig. 13.

Referring to fig. 11, the positioning portions 320 on the rotating shaft 32 of the present embodiment have at least two, and the positioning portions 320 are arranged at intervals in the circumferential direction of the rotating shaft 32, so that the smoke barrier 12 can be reliably positioned at a plurality of turning angles. Preferably, the positioning portion 320 of the present embodiment has two, and the included angle formed by the two positioning portions 320 with respect to the axis of the rotation shaft 32 is α, wherein α is 140 ° or more and 160 ° or less, and specifically, α is preferably 160 °. Of the two positioning portions 320, one positioning portion 320 corresponds to the opened state of the smoke barrier 12, and the other positioning portion 320 corresponds to the closed state of the smoke barrier 12, where α is 160 °, that is, the rotation angle of the smoke barrier 12 between the closed state and the opened state is 160 °.

The rotation connecting mechanism of this embodiment has two sets ofly, is located the length direction's of keeping off cigarette board 12 both sides respectively, guarantees the firm nature of keeping off cigarette board 12 upset process. The turning action of the smoke barrier 12 in this embodiment may be driven by an electric driving mechanism, or may be directly turned manually by a user. The electric driving mechanism (not shown) is preferably a motor, and the motor can be arranged on the smoke collecting hood 11, and a driving shaft of the motor can be directly connected with the rotating shaft 32 of the rotating connecting mechanism or connected with the rotating connecting mechanism through a transmission mechanism, so that the rotating shaft 32 is driven to rotate around the axis of the rotating shaft.

Claims (11)

1. A ceiling-mounted range hood, comprising:

a smoke collecting cover (11) with a smoke collecting cavity (110) at the bottom;

a smoke baffle plate (12) which is rotationally arranged below the front side of the smoke collecting hood (11);

the method is characterized in that: the smoke baffle plate (12) has an opening state which is unfolded relative to the smoke collecting cover (11) so that at least part of the smoke collecting plate is positioned outside the vertical projection of the smoke collecting cavity (110) on the horizontal plane and a folding state which is folded relative to the smoke collecting cover (11) in the process of rotating relative to the smoke collecting cover (11).

2. The ceiling-mounted range hood according to claim 1, wherein: in an opening state, the smoke baffle plate (12) inclines forwards from top to bottom, the inclination angle of the smoke baffle plate (12) and a vertical plane is A, and A is more than or equal to 50 degrees and less than or equal to 70 degrees.

3. The ceiling-mounted range hood according to claim 1, wherein: in a folding state, the smoke baffle plate (12) is positioned in the smoke collecting cavity (110), and the lowest position of the smoke baffle plate (12) is higher than that of the smoke collecting cover (11).

4. The ceiling-mounted range hood according to any one of claims 1 to 3, wherein: the cross section of the smoke baffle plate (12) is at least in an arc shape at one end far away from the smoke collecting hood (11), and the concave surface of the smoke baffle plate (12) faces downwards in an opening state.

5. The ceiling-mounted range hood according to any one of claims 1 to 3, wherein: still including being used for connecting collection petticoat pipe (11) with keep off the rotation coupling mechanism of cigarette board (12), this rotation coupling mechanism includes:

the connecting base (20) is arranged on the smoke collecting hood (11) and is provided with a rotating shaft hole (21);

pivot support (30), including support body (31) and rotation axis (32) of connection on support body (31), support body (31) are connected with cigarette board (12), rotation axis (32) can be located with rotating in the pivot hole (21), rotation axis (32) with dispose between connecting seat (20) and be used for the restriction pivot support (30) continue pivoted location structure after rotating to target in place.

6. The ceiling-mounted range hood according to claim 5, wherein: the positioning structure is characterized by further comprising a sliding block (41) and an elastic piece (42), wherein the sliding block (41) is constrained on the connecting seat (20) in a mode that the sliding block can be close to or far away from the rotating shaft (32) and is abutted against the outer peripheral surface of the rotating shaft (32), an area, corresponding to the sliding block (41), on the outer peripheral surface of the rotating shaft (32) is provided with a circumferential radius which is reduced firstly and then increased later along the rotating shaft (32) is used as a positioning part (320) to block the rotating shaft (32) from continuing rotating relative to the connecting seat (20), the elastic piece (42) acts on the sliding block (41) and enables the sliding block (41) to always have a trend of moving towards the rotating shaft (32), and the positioning part (320) of the rotating shaft (32), the sliding block (41) and the elastic piece (42) jointly form the positioning structure.

7. The ceiling-mounted range hood according to claim 6, wherein: the positioning part (320) of the rotating shaft (32) is a plane formed on the outer peripheral surface of the rotating shaft (32) or an arc-shaped surface formed by radially inwards recessing the outer peripheral surface of the rotating shaft (32).

8. The ceiling-mounted range hood according to claim 6, wherein: the connecting seat (20) is provided with a strip-shaped sliding groove (22) communicated with the rotating shaft hole (21), the length direction of the strip-shaped sliding groove (22) is perpendicular to the axial direction of the rotating shaft hole (21), and the sliding block (41) is arranged in the strip-shaped sliding groove (22) in a sliding mode.

9. The ceiling-mounted range hood according to claim 6, wherein: the number of the positioning parts (320) is at least two, and the positioning parts (320) are arranged at intervals along the circumferential direction of the rotating shaft (32).

10. The ceiling-mounted range hood according to claim 6, wherein: the positioning parts (320) are provided with two parts, the included angle formed by the two positioning parts (320) relative to the axis of the rotating shaft (32) is alpha, and alpha is more than or equal to 140 degrees and less than or equal to 160 degrees.

11. The ceiling-mounted range hood according to claim 5, further comprising:

the electric driving mechanism is arranged on the smoke collecting cover (11), and the power action end of the electric driving mechanism is connected with the rotating shaft (32) to drive the rotating shaft (32) to rotate around the axis of the electric driving mechanism.

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