CN111434993B

CN111434993B - Fume exhaust fan

Info

Publication number: CN111434993B
Application number: CN201910024960.4A
Authority: CN
Inventors: 王磊
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2022-06-21
Anticipated expiration: 2039-01-11
Also published as: CN111434993A

Abstract

The utility model provides a range hood, includes fan dustcoat and collection petticoat pipe, and the collection petticoat pipe includes outer collection petticoat pipe and inlayer collection petticoat pipe, and the air intermediate layer between outer collection petticoat pipe and the inlayer collection petticoat pipe forms inlet channel, and inlet channel narrows down along the air current direction gradually, and the top of inlayer collection petticoat pipe is equipped with the oil smoke sunction inlet that is linked together with inlet channel's export, and the shaping has inside convex water conservancy diversion piece on the inner wall of inlayer collection petticoat pipe, is equipped with the opening that feeds through collection smoke chamber and inlet channel on the water conservancy diversion piece. This range hood's air inlet channel narrows down along the air current direction gradually, and the existence of the inside and outside pressure differential of water conservancy diversion piece opening part avoids the outer oil smoke of inlayer collection petticoat pipe to flee after striking the wall for the oil smoke hugs closely the wall, and the increasing of the inside and outside pressure differential value of different positions opening and the coanda effect guide oil smoke move along inlayer collection petticoat pipe slant, have strengthened the oil smoke guide effect, constantly inhale the oil smoke sunction inlet to inlayer collection petticoat pipe top with the oil smoke, thereby effectively prevent to get into the oil smoke escape of collection petticoat pipe, improve the oil absorption cigarette effect.

Description

Fume exhaust fan

Technical Field

The invention relates to a range hood.

Background

At present, the integral installation height of the European-style range hood determines that the range hood is far away from a pot generating oil smoke, the negative pressure loss is large, the oil smoke rising above the pot easily escapes from two sides of a smoke collecting cover, the oil smoke suction effect is poor, and the traditional range hood cannot suck back once the oil smoke is separated from an area. 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.

There is the range hood that prevents the oil smoke escape through the structure that sets up the fender cigarette board among the prior art, like the chinese utility model patent of patent number ZL 201320021818.2 (the grant bulletin number is CN 203068633U) discloses "range hood", this range hood installs the fender cigarette board that can rotate in range hood's smoking mouth front side, through the angle that changes fender cigarette board and smoking mouth, adjust range hood's smoking effect, and when not using, can hide the inside rotation of fender cigarette board, thereby improve the wholeness of range hood and cupboard. As disclosed in the chinese utility model patent with patent No. ZL 201520764022.5 (No. CN 205037392U), the range hood is provided with at least one movable smoke baffle capable of opening and increasing the smoke receiving area of the smoke collecting hood on the smoke collecting hood body, and when in use, the movable smoke baffle is opened to increase the smoke receiving area of the smoke collecting hood, thereby blocking the rising smoke. Above-mentioned range hood increases the area of receiving the cigarette of collection petticoat pipe through the cooperation that keeps off the cigarette board and collection petticoat pipe, though can prevent that the oil smoke from escaping, nevertheless the during operation need open and keep off the cigarette board, leads to range hood structure succinct inadequately, and pleasing to the eye, and still need set up actuating mechanism in addition and drive and keep off the motion of cigarette board, and the structure is comparatively complicated.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a range hood with simple structure and good oil smoke suction effect aiming at the current situation of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: this range hood includes the fan dustcoat and locates the collection petticoat pipe of fan dustcoat below, install the fan system in the fan dustcoat, collection petticoat pipe inboard forms collection smoke chamber its characterized in that: the exhaust fume collecting hood comprises an outer exhaust fume collecting hood body and an inner exhaust fume collecting hood body, an air interlayer between the outer exhaust fume collecting hood body and the inner exhaust fume collecting hood body forms an air inlet channel, the air inlet channel gradually narrows down along the air flow direction, the top of the inner exhaust fume collecting hood body is provided with an oil fume suction inlet communicated with an outlet of the air inlet channel, an inward convex flow guide block is formed on the inner wall of the inner exhaust fume collecting hood body, and an opening communicated with the exhaust fume collecting cavity and the air inlet channel is formed in the flow guide block.

As a preferable scheme, the flow guide blocks are formed on the left inner side surface and the right inner side surface of the inner smoke collecting cover.

As another preferable scheme, the flow guide blocks are formed on the front inner side surface, the left inner side surface and the right inner side surface of the inner smoke collecting hood.

In order to ensure that the fume collecting hood has better guiding performance to the fume, the included angle alpha between the left inner side surface and the right inner side surface of the inner fume collecting hood relative to the horizontal plane is more than 30 degrees and less than 65 degrees.

Preferably, the inner convex surface of the flow guide block comprises a first inclined surface and a second inclined surface, the first inclined surface is inclined upwards from outside to inside, the second inclined surface is arranged on the inner side of the first inclined surface and inclined inwards from top to bottom, and the opening is arranged on the second inclined surface.

In order to ensure that the oil fume is less obstructed by the flow guide block and no oil is accumulated on the flow guide block, the included angle between the first inclined plane and the left inner side surface and the included angle beta between the first inclined plane and the right inner side surface are more than 10 degrees and less than 35 degrees, and the beta is less than alpha.

In order to ensure that oil drops can not drip through the inner smoke collecting hood, the included angle theta of the second inclined plane relative to the horizontal plane is preferably theta < 90 degrees.

In order to ensure that the airflow can be better attached to the inner-layer fume collecting hood, preferably, the first inclined plane is connected with the second inclined plane through a circular arc surface.

Preferably, the first inclined plane and the arc surface are in smooth transition, and the second inclined plane and the arc surface are in smooth transition.

More preferably, the radius R of the arc surface is not less than 3 mm.

Compared with the prior art, the invention has the advantages that: the air inlet channel between the inner layer smoke collecting cover and the outer layer smoke collecting cover of the range hood is gradually narrowed along the airflow direction, the existence of the internal and external pressure difference of the opening part of the flow guide block avoids the oil smoke outside the inner layer smoke collecting cover from escaping after impacting the wall surface, so that the oil smoke is tightly attached to the wall surface, the incremental increase of the internal and external pressure difference values of the opening at different positions and the coanda effect guide the oil smoke to move upwards along the inner layer smoke collecting cover in an inclined way, the oil smoke guiding effect is enhanced, part of the oil smoke is continuously introduced into the air inlet channel through the opening, and the oil smoke sucking port sucked to the top of the inner layer smoke collecting cover is entered, so that the oil smoke entering the smoke collecting cover is effectively prevented from escaping, and the oil smoke sucking effect is improved.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a structural cross-sectional view of an embodiment of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic structural view of an inner smoke collecting hood according to an embodiment of the invention;

fig. 5 is a structural sectional view of an inner smoke collecting hood of the embodiment of the invention;

fig. 6 is an enlarged schematic view of a portion B in fig. 5.

Detailed Description

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

As shown in fig. 1 to 6, the range hood of the present embodiment is a top-suction range hood, which includes a fan housing 1 and a smoke collecting hood 2 disposed below the fan housing, a fan system (not shown) is installed in the fan housing 1, and a smoke collecting cavity 3 is formed inside the smoke collecting hood 2. The above structure is prior art and will not be described herein.

The fume collecting hood 2 comprises an outer fume collecting hood 21 and an inner fume collecting hood 22, an air interlayer between the outer fume collecting hood 21 and the inner fume collecting hood 22 forms an air inlet channel 23, the air inlet channel 23 gradually narrows along the airflow direction, and the top of the inner fume collecting hood 22 is provided with a fume suction inlet 228 communicated with the outlet of the air inlet channel 23.

In the embodiment, in order to ensure that the fume collecting cover 2 has better guiding performance for the fume, the included angle alpha between the left inner side surface 221 and the right inner side surface 222 of the inner fume collecting cover 22 relative to the horizontal plane h is more than 30 degrees and less than 65 degrees.

An inward convex deflector block 223 is formed on the front inner side surface 220, the left inner side surface 221 and the right inner side surface 222 of the inner-layer fume collecting hood 22. The interior convex surface of the guide block 223 includes a first inclined surface 225, a second inclined surface 226 and an arc surface 227, the first inclined surface 225 inclines upwards from outside to inside, the second inclined surface 226 is arranged at the inner side of the first inclined surface 225 and inclines inwards from top to bottom, the arc surface 227 is used for connecting the first inclined surface 225 and the second inclined surface 226, the first inclined surface 225 and the arc surface 227 and the second inclined surface 226 and the arc surface 227 are in smooth transition, and the radius R of the arc surface 227 is larger than or equal to 3 mm. After the arc surface 227 is adopted, the air flow can be ensured to better cling to the inner smoke collecting cover 22 to flow. An opening 224 is opened on the second inclined surface 226, and the opening 224 is communicated with the smoke collecting cavity 3 and the air inlet channel 23.

In order to ensure that the obstruction of the flow guide block 223 to the oil smoke is small and no oil is accumulated on the flow guide block 223, the included angle between the first inclined plane 225 and the left inner side surface 221 and the included angle beta between the first inclined plane 225 and the right inner side surface 222 are more than 10 degrees and less than beta and less than 35 degrees, and beta is more than alpha. In addition, in order to ensure that oil droplets do not drip through the inner fume collecting cover 22, the angle θ of the second inclined surface 226 with respect to the horizontal plane h is θ < 90 °.

As the air inlet channel 23 is gradually narrowed along the air flow direction, the air flow in the air inlet channel 23 is continuously increased, and the Bernoulli equation of the air is used

The static pressure value decreases as the sum of the static pressure and the dynamic pressure is kept constant. The inside and outside sides of the opening 224 of the flow guide block 223 form a pressure difference to prevent the oil smoke outside the inner-layer smoke collecting hood 22 from escaping after impacting the wall surface, and according to the coanda effect, the smooth transition of the first inclined surface 225, the second inclined surface 226 and the arc surface 227 of the flow guide block 223 ensures that the airflow can better cling to the inner-layer smoke collecting hood 22 to guide the oil smoke to move obliquely upwards along the inner-layer smoke collecting hood 22, and the pressure difference value at the opening 224 is continuously increased along the airflow flowing direction, so that the oil smoke guiding function of the inner-layer smoke collecting hood 22 is enhanced, the oil smoke can continuously enter the air inlet channel 23 through the opening 224, and further be introduced into the oil smoke suction inlet 228 at the top of the inner-layer smoke collecting hood 22.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications or improvements may be made to the present invention without departing from the principle of the present invention, for example, the baffle block may also be arranged only on the left inner side and the right inner side of the inner layer smoke collecting hood, which are all considered to be within the protection scope of the present invention.

Claims

1. The utility model provides a range hood, includes fan dustcoat (1) and collection petticoat pipe (2) of locating the fan dustcoat below, install the fan system in fan dustcoat (1), collection petticoat pipe (2) inboard forms collection smoke chamber (3), its characterized in that: the collection petticoat pipe (2) are including outer collection petticoat pipe (21) and inlayer collection petticoat pipe (22), air interlayer between outer collection petticoat pipe (21) and inlayer collection petticoat pipe (22) forms inlet air duct (23), inlet air duct (23) narrows down along the air current direction gradually, the top of inlayer collection petticoat pipe (22) be equipped with oil smoke suction inlet (228) that the export of inlet air duct (23) is linked together, the shaping is inside convex water conservancy diversion piece (223) on the inner wall of inlayer collection petticoat pipe (22) be equipped with the intercommunication on water conservancy diversion piece (223) collection smoke chamber (3) and opening (224) of inlet air duct (23).

2. The range hood of claim 1, wherein: the flow guide blocks (223) are formed on the left inner side surface (221) and the right inner side surface (222) of the inner-layer smoke collecting hood (22).

3. The range hood of claim 1, wherein: the flow guide blocks (223) are formed on the front inner side surface (220), the left inner side surface (221) and the right inner side surface (222) of the inner-layer smoke collecting cover (22).

4. A range hood according to claim 2 or 3, wherein: the included angle alpha between the left inner side surface (221) and the right inner side surface (222) of the inner-layer smoke collecting hood (22) and the horizontal plane is more than 30 degrees and less than 65 degrees.

5. The range hood of claim 4, wherein: the inner convex surface of the flow guide block (223) comprises a first inclined surface (225) and a second inclined surface (226), the first inclined surface (225) inclines upwards from outside to inside, the second inclined surface (226) is arranged on the inner side of the first inclined surface (225) and inclines inwards from top to bottom, and the opening (224) is arranged on the second inclined surface (226).

6. The range hood of claim 5, wherein: the included angle between the first inclined surface (225) and the left inner side surface (221) and the included angle beta between the first inclined surface (225) and the right inner side surface (222) are more than 10 degrees and less than beta and less than 35 degrees, and the beta is less than alpha.

7. The range hood of claim 5, wherein: the angle theta of the second inclined surface (226) relative to the horizontal plane is theta < 90 degrees.

8. The range hood of claim 5, wherein: the first inclined surface (225) is connected with the second inclined surface (226) through a circular arc surface (227).

9. The range hood of claim 8, wherein: the first inclined plane (225) and the arc surface (227) are in smooth transition, and the second inclined plane (226) and the arc surface (227) are in smooth transition.

10. The range hood of claim 8, wherein: the radius R of the arc surface (227) is more than or equal to 3 mm.