CN111561722A

CN111561722A - Installation structure of smoke guide plate and oil cup and range hood applying installation structure

Info

Publication number: CN111561722A
Application number: CN202010424587.4A
Authority: CN
Inventors: 刘元卉
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2020-08-21

Abstract

The invention discloses a smoke guide plate and oil cup mounting structure, which comprises a smoke guide plate, an oil cup and a mounting piece of a mounting base for mounting the smoke guide plate and the oil cup to the outside, and is characterized in that: the installed part is an organic whole, the installed part including be used for with outside installation basis be connected fixed main part, set up in the main part with the first installation department that the smoke deflector is connected and set up in the main part with the second installation department that the oil cup is connected. Also discloses a range hood applying the mounting structure. Compared with the prior art, the invention has the advantages that: the oil cup and the smoke guide plate are installed on an external installation foundation through the same component, so that the number of components is small, the installation is convenient, and the cost is reduced.

Description

Installation structure of smoke guide plate and oil cup and range hood applying installation structure

Technical Field

The invention relates to an oil fume purification device, in particular to an oil fume purification device, a range hood, and an installation structure of a fume guide plate and an oil cup of the range hood.

Background

The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

The top-suction type range hood adopts an oil smoke rising principle, a negative pressure area is generated right above a cooking bench to suck and exhaust naturally rising oil smoke generated during cooking, and the range hood has the advantages of fashionable and concise appearance, larger air volume, larger space and capability of capturing the oil smoke far away from the cooking bench, and has the defects that the installation height is far away from the cooking bench, and the oil smoke above a pot is easy to be disturbed by ambient air to cause the escape of the oil smoke to the periphery under the cooking state with small oil smoke volume, so that the oil smoke suction effect is poor.

Therefore, a smoke guide plate is generally arranged below an air inlet of the top-suction range hood to form an annular suction structure, and the oil smoke suction effect is improved by utilizing the coanda effect. The top suction type range hood with the smoke guide plate disclosed in the chinese patent with the application number of 201410419676.4 comprises a body, a smoke collecting hood and the smoke guide plate, wherein the smoke collecting hood is connected with the body, a fan is arranged in the body, an air inlet is arranged on the smoke collecting hood, the smoke guide plate is arranged right opposite to the air inlet of the smoke collecting hood and fixed on the smoke collecting hood through a bracket or a buckle, and a distance exists between the smoke guide plate and the smoke collecting hood to form a smoke channel.

The existing range hood has the structure that the smoke guide plate is mostly fixed in the smoke collection cavity through two rotatable hooks and two buckles, and components such as a hanging rack latch of a fixed structure of the smoke guide plate are hung on the smoke collection cavity and cannot be disassembled. The user needs to bypass the four parts when cleaning the smoke collecting cavity, so that the cleaning is inconvenient, and oil is easy to store in corners; in addition, the installation structure uses many related parts, so that the cost is too high and the installation is very inconvenient.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a structure for installing a smoke guide plate and an oil cup, which has few installation components and is convenient to install, in order to overcome the defects of the prior art.

The second technical problem to be solved by the invention is to provide a range hood with the mounting structure.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a mounting structure of smoke deflector and oil cup, includes smoke deflector, oil cup and is used for installing smoke deflector and oil cup to the installation base's of outside installed foundation's installed part, its characterized in that: the installed part is an organic whole, the installed part including be used for with outside installation basis be connected fixed main part, set up in the main part with the first installation department that the smoke deflector is connected and set up in the main part with the second installation department that the oil cup is connected.

Preferably, be connected with the installed part respectively for leading cigarette board and oil cup, first installation department and second installation department set up on two adjacent sides of main part, first installation department and leading cigarette board overlap joint and realize being connected, the second installation department is pegged graft with the oil cup and is realized being connected.

In order to facilitate the installation of the smoke guide plate and the oil cup at the same time, the main body is provided with a first side surface and a second side surface which are oppositely arranged in the first direction, the first side surface is used for being matched with an external installation base, the second installation part is arranged on one side surface of the main body in the second direction, the first installation part is arranged on one side surface of the main body in the third direction, and the first direction, the second direction and the third direction are mutually vertical in pairs.

Further, in order to facilitate the installation of the smoke guide plate, the first installation part comprises a lapping surface, the lapping surface is a plane extending from the main body in the third direction, and the periphery of the smoke guide plate can be lapped on the lapping surface.

For avoiding leading the cigarette board to remove in the first direction, first installation department still includes spacing protruding, spacing protruding orientation is kept away from the direction arch of main part and is formed, spacing protruding relative faying surface is more close to the first side of main part, it has the turn-ups to lead the periphery of cigarette board, the turn-ups can block between spacing protruding and faying surface.

For avoiding leading the cigarette board to remove on the second direction, first installation department still includes spacing couple, the one end of main part is kept away from at the faying surface to spacing couple setting, spacing couple is crooked towards the direction of first side, lead and seted up on the cigarette board with spacing couple complex hanging hole.

Further, for the installation of oil cup, the second installation department includes spacing portion of first spacing portion and the spacing portion of second of interval arrangement in the first direction, the relative spacing portion of second of first spacing portion is more close to first side, form the slot between spacing portion of first spacing portion and second, the oil cup includes the cup and sets up the hangers of buckling in the middle of the cup both sides orientation, the hangers can block in the slot between spacing portion of first spacing portion and second.

For facilitating the installation of the oil cup, the first limiting part is close to the distance between one side of the first installation part and the first installation part, and the distance between one side of the second limiting part close to the first installation part and the first installation part is smaller than the distance between the second limiting part and the first installation part.

For avoiding hangers atress to warp, the spacing portion of second includes heavy groove and step portion, heavy groove is sunken and forms to keeping away from first spacing portion by the surface of the spacing portion of second towards first spacing portion, step portion forms one side of keeping away from the main part at heavy groove, is buckled and forms by the direction of the first spacing portion of this side direction of heavy groove, the distance between main part one side and the main part is kept away from to first spacing portion is less than the distance between step portion and the main part of the spacing portion of second, and the distance difference of two distances is greater than the thickness of the hangers of oil cup.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides an be applied as above range hood of the mounting structure of smoke deflector and oil cup, includes the collection petticoat pipe as outside installation basis, is formed with the air intake on the collection petticoat pipe, the smoke deflector sets up the below at the air intake, the front side of smoke deflector can be dismantled with collection petticoat pipe and be connected its characterized in that: the rear side of the smoke guide plate is connected with the smoke collecting hood through the mounting piece, and the oil cup is arranged at the bottom of the rear side of the smoke collecting hood through the mounting piece.

Furthermore, in order to facilitate the connection of the main body and the smoke collecting hood, the main body is provided with a first mounting hole, the bottom of the smoke collecting hood is provided with a second mounting hole, and the mounting piece and the smoke collecting hood are connected by a fastener penetrating through the second mounting hole and the first mounting hole; the main part and collection petticoat pipe complex top surface undercut and form positioning groove, positioning groove runs through the main part in the left and right directions, the rear side bottom of collection petticoat pipe can be gone into in the positioning groove.

Compared with the prior art, the invention has the advantages that: the oil cup and the smoke guide plate are mounted with an external mounting base through the same component, so that the number of components is small, the mounting is convenient, and the cost is reduced; the first mounting part ensures that the smoke guide plate cannot be accidentally separated through the overlapping surface, the limiting protrusion and the limiting hook, and the freedom degrees in all directions are limited after the smoke guide plate is mounted in place; the second installation department is pegged graft with the oil cup hangers through the slot that forms between two spacing portions, and lower spacing portion comprises heavy groove and step portion, can hang the hangers when the oil cup drops, avoids the hangers atress to warp.

Drawings

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

FIG. 2 is a cross-sectional view of a range hood in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of the installation structure of the smoke guide plate and the oil cup of the range hood according to the embodiment of the present invention;

fig. 4 is a schematic view of a smoke guide plate of the installation structure of the smoke guide plate and the oil cup of the range hood according to the embodiment of the invention;

fig. 5 is a schematic view of an oil cup of the installation structure of the smoke guide plate and the oil cup of the range hood according to the embodiment of the invention;

fig. 6 is a schematic view of a mounting member of the mounting structure of the smoke guide plate and the oil cup of the range hood according to the embodiment of the invention;

fig. 7 is a sectional view of a mounting member of the mounting structure of the smoke guide plate and the oil cup of the range hood according to the embodiment of the present invention;

fig. 8 is a top view of the mounting member of the mounting structure of the smoke guide plate and the oil cup of the range hood according to the embodiment of the present invention;

FIG. 9 is a schematic view of a single-side drop of an oil cup of the range hood according to the embodiment of the present invention;

fig. 10 is a schematic view of the mount and oil cup of fig. 9.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

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 and 2, a range hood, which is a top-suction range hood, includes a smoke collecting hood 1, and a fan frame 2 disposed above the smoke collecting hood 1, wherein a fan system (not shown) can be disposed in the fan frame 2. An air inlet 11 is formed on the smoke collecting cover 1, and is used for enabling the oil smoke to enter the fan frame 2 through the air inlet 11 and then to be discharged to a public flue or a room through a fan system. An upwards sunken smoke collecting cavity 12 is formed on the inner side of the smoke collecting cover 1, and the air inlet 11 is positioned at the top of the smoke collecting cavity 12.

The lower part of the air inlet 11 is provided with a smoke guide plate 3, the bottom of the rear side of the smoke collecting hood 1 is provided with an oil cup 4, and the rear side of the smoke guide plate 3 and the oil cup 4 are connected with the smoke collecting hood 1 through an installation part 5. The installed part 5 is connected fixedly with collection petticoat pipe 1 to adopt the overlap joint mode, adopt the grafting mode with oil cup 4 with leading cigarette board 3 to be connected, make leading cigarette board 3 and oil cup 4 adopt same installation part to realize the installation, be convenient for promote the clean ability of leading cigarette board 3, simultaneously can be easy to assemble, reduce cost. The front side of the smoke guide plate 3 can be detachably connected with the smoke collecting cover 1 through the prior art, such as a latch catch claw assembly.

Referring to fig. 6 to 8, the mounting member 5 is a single member having a main body 51, a first mounting portion 52 provided on one side surface of the main body 51, and a second mounting portion 53 provided on the other side surface of the main body 51, wherein the first mounting portion 52 and the second mounting portion 53 are provided on two adjacent side surfaces of the main body 51. In order to stably mount the smoke guide 3, two mounting parts 5 are generally required, which are respectively provided on the left and right sides of the smoke guide 3, the second mounting parts 53 of the two mounting parts 5 are provided on the side where the main body 51 is away from each other, that is, the mounting part 5 on the left side, the second mounting part 53 is provided on the left side surface of the main body 51, the mounting part 5 on the right side, and the second mounting part 53 is provided on the right side surface of the main body 51.

For convenience of description, the following coordinate axis directions are defined, and referring to fig. 6, the vertical direction is the first direction X, the horizontal direction is the second direction Y, and the front-rear direction is the third direction Z in the mounted state of the mount 5. The first direction X, the second direction Y and the third direction Z are mutually vertical in pairs. The main body 51 is provided with a first mounting hole 511, the main body 51 has a first side surface 512 and a second side surface 513 which are oppositely arranged in the first direction X, and the first mounting hole 511 penetrates through the first side surface 512 and the second side surface 513 of the main body 51 in the first direction X. Wherein the first mounting portion 52 is provided on one of the side surfaces of the main body 51 in the third direction Z, and the second mounting portion 53 is provided on one of the side surfaces of the main body 51 in the second direction Y.

The second mounting hole 13 is opened at the bottom of the rear side of the smoke collecting cover 1. Thus, when it is necessary to mount the mounting piece 5 with the smoke collecting hood 1, the mounting piece 5 is placed below the rear side of the smoke collecting hood 1 so that the first mounting hole 511 extends in the longitudinal direction, and then the main body 51 is fixedly connected with the rear side bottom of the smoke collecting hood 1 by fasteners such as screws through the first mounting hole 511 and the second mounting hole 13, thereby achieving the mounting of the mounting piece 5 and the smoke collecting hood 1.

When the first side 512 is installed, the first side 512 is matched with the bottom of the rear side of the smoke collecting cover 1, in order to further ensure the fixed position of the installation piece 5 relative to the smoke collecting cover 1, a positioning groove 514 which is sunken towards the second side 513 is formed on the first side 512, and two ends of the positioning groove 514 in the second direction Y penetrate through the main body 51, so that the bottom of the rear side of the smoke collecting cover 1 is clamped in. The shape and size of the positioning groove 514 are matched with the bottom of the smoke collecting cover 1, so that the bottom of the smoke collecting cover 1 can be clamped in the positioning groove 514, and the installation piece 5 can be prevented from rotating on the horizontal plane relative to the smoke collecting cover 1.

The first mounting portion 52 includes a limit protrusion 521, an overlapping surface 522 and a limit hook 523, wherein the limit protrusion 521 is formed to be convex toward a direction away from the main body 51, the overlapping surface 522 is a plane extending in the third direction Z, and the limit hook 523 is disposed at one end of the overlapping surface 522 away from the main body 51. The stopper hook 523 is bent toward the stopper protrusion 521 (the first side 512). The position-limiting protrusion 521 is closer to the first side 512 of the main body 51 than the overlapping surface 522, and when installed, the position-limiting protrusion 521 is located above the overlapping surface 522, and the position-limiting hook 523 is bent upward. Referring to fig. 3 and 4, a hanging hole 31 is opened at the rear side of the smoke guide plate 3 and can be matched with a limit hook 523. The periphery of the smoke guide plate 3 is also provided with a flanging 32 which is bent upwards to avoid the grease on the upper surface of the smoke guide plate 3 from dropping.

When the smoke guide plate 3 is installed, the rear side of the smoke guide plate 3 is lapped on the lapping surface 522 of the first installation part 52, at the moment, the hanging hole 31 on the smoke guide plate 3 is aligned and nested with the limiting hook 523, the smoke guide plate 3 is pushed backwards, the front side claw is buckled into the latch, and the smoke guide plate 3 is installed. After the installation, the rear side flanging 32 of the smoke guide plate 3 is clamped between the lapping surface 522 and the limiting protrusion 521, so that the smoke guide plate 3 cannot move up and down; the limit hook 523 is nested with the hanging hole 31 to ensure that the smoke guide plate 3 does not move left and right.

When dismantling, pull down the claw of bumping of front side earlier, under spacing of limiting hook 523 to hanging hole 31 of leading cigarette board 3, leading cigarette board 3 can directly not follow landing surface 522 and landing, need slightly lift leading cigarette board 3, make limiting hook 523 deviate from behind hanging hole 31, take away leading cigarette board 3 again to can not make leading cigarette board 3 drop because of the hand is smooth or lost hand when having guaranteed to dismantle leading cigarette board 3.

Referring to fig. 6 to 8, the second mounting portion 53 includes a first position-limiting portion 531 and a second position-limiting portion 532 arranged at intervals in the first direction X, and the first position-limiting portion 531 is closer to the first side surface 512 than the second position-limiting portion 532. A slot 533 is formed between the first position-limiting portion 531 and the second position-limiting portion 532. The distance between the first mounting portion 52 and the side of the first stopper portion 531 closer to the first mounting portion 52 (the side in the third direction Z) is smaller than the distance between the first mounting portion 52 and the side of the second stopper portion 532 closer to the first mounting portion 52. That is, when in the mounted state, the first stopper portion 531 is located above the second stopper portion 532, and the front side of the first stopper portion 531 is located behind the front side of the second stopper portion 532, the distance by which the first stopper portion 531 is retracted with respect to the second stopper portion 532 is preferably 2 mm. The left/right sides of the first position limiting portion 531 (the left side of the first position limiting portion 531 when installed on the left side of the smoke guide plate 3, and the right side of the first position limiting portion 531 when installed on the right side of the smoke guide plate 3) are located to the left/right sides of the left side of the second position limiting portion 532.

Referring to fig. 5, the oil cup 4 includes a cup body 41 with an open top end and lugs 42 disposed at both sides of the cup body 41 and bent toward the middle. The hanging lug 42 is used for being clamped between the first limiting part 531 and the second limiting part 532. Due to the retraction structure of the first limiting portion 531 relative to the second limiting portion 532, when the oil cup 4 is installed, as long as the hanging lug 42 is pushed to a height higher than the second limiting portion 532, the oil cup can fall onto the upper surface of the second limiting portion 532 only by vertically falling, and the installation is convenient.

At present, the condition that the hangers 42 are easy to deform during the assembly and disassembly of the oil cup 4 generally exists, because when a user installs the oil cup 4, the hangers 42 on two sides cannot be installed at the same time, and the other side is often installed after one side is installed, and the condition that the hangers 42 of the oil cup 4 on one side installed firstly are deformed by the oil cup hook in other ways can occur in the process. Therefore, in the present invention, the distance between the side of the first stopper portion 531 away from the main body 51 (the side in the second direction Y) and the main body 51 is smaller than the distance between the side of the second stopper portion 532 away from the main body 51 and the main body 51. Specifically, the second position-limiting portion 532 includes a sinking groove 5321 and a step portion 5322, the sinking groove 5321 is formed by the second position-limiting portion 532 sinking toward the surface of the first position-limiting portion 531 away from the first position-limiting portion 531, and the step portion 5322 is formed on the side (on the second direction Y) of the sinking groove 5321 away from the main body 51 and is formed by bending the side of the sinking groove 5321 toward the first position-limiting portion 531. The distance between the first stopper 531 and the body 51 on the side away from the body 51 is smaller than the distance between the stepped portion 5322 of the second stopper 532 and the body 51, preferably 1mm or more, and may have other dimensions, but this distance difference d must be larger than the thickness of the hanging lug 42 of the oil cup 4.

Under the structure, even if a user installs or removes the oil cup 4, only the one-side hanging lug 42 is installed, even if the oil cup 4 is carelessly taken off the hand after only the one-side hanging lug 42 is installed, the oil cup 4 can rotate by 90 degrees around the second installation part 53 of the side without being clamped by the oil cup hanging lug 42, and the step part 5322 can prevent the hanging lug 42 of the oil cup 4 from coming off the second installation part 53, so that the situation that the hanging lug 42 of the oil cup 4 is deformed and finally is difficult to detach is avoided, and the situation is shown in fig. 9 and 10.

Claims

1. The utility model provides a mounting structure of smoke deflector and oil cup, includes smoke deflector (3), oil cup (4) and is used for installing smoke deflector (3) and oil cup (4) to installation base's of outside installed part (5), its characterized in that: the installation part (5) is an integrated part, and the installation part (5) comprises a main body (51) used for being connected and fixed with an external installation base, a first installation part (52) arranged on the main body (51) and connected with the smoke guide plate (3), and a second installation part (53) arranged on the main body (51) and connected with the oil cup (4).

2. The smoke guide and oil cup mounting structure according to claim 1, wherein: first installation department (52) and second installation department (53) set up on two adjacent sides of main part (51), first installation department (52) and smoke deflector (3) overlap joint and realize connecting, second installation department (53) are pegged graft with oil cup (4) and are realized connecting.

3. The smoke guide plate and oil cup mounting structure according to claim 2, wherein: the main part (51) is provided with a first side surface (512) and a second side surface (513) which are oppositely arranged in a first direction (X), the first side surface (512) is used for being matched with an external installation base, the second installation part (53) is arranged on one side surface of the main part (51) in a second direction (Y), the first installation part (52) is arranged on one side surface of the main part (51) in a third direction (Z), and the first direction (X), the second direction (Y) and the third direction (Z) are mutually vertical pairwise.

4. The smoke guide and oil cup mounting structure according to claim 3, wherein: the first mounting portion (52) includes a landing surface (522), the landing surface (522) is a plane extending in a third direction (Z) from the main body (51), and the periphery of the smoke guide plate (3) can be landed on the landing surface (522).

5. The smoke guide plate and oil cup mounting structure according to claim 4, wherein: the first mounting portion (52) further comprises a limiting protrusion (521), the limiting protrusion (521) is formed by protruding towards the direction far away from the main body (51), the limiting protrusion (521) is closer to the first side face (512) of the main body (51) relative to the overlapping surface (522), a flange (32) is arranged on the periphery of the smoke guide plate (3), and the flange (32) can be clamped between the limiting protrusion (521) and the overlapping surface (522).

6. The smoke guide plate and oil cup mounting structure according to claim 4, wherein: first installation department (52) still include spacing couple (523), spacing couple (523) set up the one end of keeping away from main part (51) in faying surface (522), spacing couple (523) are crooked towards the direction of first side (512), set up on smoke guide plate (3) with spacing couple (523) complex hanging hole (31).

7. The smoke guide and oil cup mounting structure according to claim 3, wherein: second installation department (53) include spacing arrangement's spacing portion (531) and spacing portion (532) of second on first direction (X), spacing portion (532) of relative second of first spacing portion (531) is more close to first side (512), form slot (533) between spacing portion (532) of first spacing portion (531) and second, oil cup (4) include cup (41) and set up hangers (42) of buckling towards the centre in cup (41) both sides, hangers (42) can block in slot (533) between spacing portion (531) of first spacing portion (531) and second (532).

8. The smoke guide and oil cup mounting structure according to claim 7, wherein: the distance between one side, close to the first installation part (52), of the first limiting part (531) and the first installation part (52) is smaller than the distance between one side, close to the first installation part (52), of the second limiting part (532) and the first installation part (52).

9. The smoke guide and oil cup mounting structure according to claim 7, wherein: the second limiting part (532) comprises a sinking groove (5321) and a step part (5322), the sinking groove (5321) is formed by the fact that the second limiting part (532) is sunken towards the surface of the first limiting part (531) to the position far away from the first limiting part (531), the step part (5322) is formed in one side, far away from the main body (51), of the sinking groove (5321) and formed by bending the sinking groove (5321) towards the direction of the first limiting part (531), the distance between one side, far away from the main body (51), of the first limiting part (531) and the main body (51) is smaller than the distance between the step part (5322) of the second limiting part (532) and the main body (51), and the distance difference (d) between the two distances is larger than the thickness of the hanging lug (42) of the oil cup (4).

10. A range hood applying the installation structure of the smoke guide plate and the oil cup according to any one of claims 1 to 9, comprising a smoke collecting hood (1) as an external installation base, wherein an air inlet (11) is formed on the smoke collecting hood (1), the smoke guide plate (3) is arranged below the air inlet (11), the front side of the smoke guide plate (3) is detachably connected with the smoke collecting hood (1), and the range hood is characterized in that: the rear side of smoke guide plate (3) is connected with smoke collecting hood (1) through mounting piece (5), oil cup (4) are arranged at the bottom of the rear side of smoke collecting hood (1) through mounting piece (5).

11. The range hood of claim 10, wherein: the main body (51) is provided with a first mounting hole (511), the bottom of the smoke collecting hood (1) is provided with a second mounting hole (13), and the mounting piece (5) is connected with the smoke collecting hood (1) through a fastener which penetrates through the second mounting hole (13) and the first mounting hole (511); main part (51) and collection petticoat pipe (1) complex top surface undercut and form positioning groove (514), positioning groove (514) run through main part (51) in the left and right sides orientation, the rear side bottom of collection petticoat pipe (1) can be gone into in positioning groove (514).