CN111197781A

CN111197781A - Fume exhaust fan

Info

Publication number: CN111197781A
Application number: CN202010052162.5A
Authority: CN
Inventors: 吴望晨; 翁建松
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-05-26
Anticipated expiration: 2040-01-17
Also published as: CN111197781B

Abstract

The invention discloses a range hood, which comprises a smoke collecting hood, a fan frame arranged above the smoke collecting hood and a fan system arranged in the fan frame, wherein the fan system comprises a volute, the smoke collecting hood comprises a left side wall and a right side wall, the range hood also comprises a smoke leakage prevention device arranged in the smoke collecting hood and the fan frame, the smoke leakage prevention device comprises a first guide pipe, a first blowing and rolling component, a second guide pipe and a second blowing and rolling component, one end of the first guide pipe is communicated with fluid in the volute, the other end of the first guide pipe extends to the left side wall, one end of the second guide pipe is communicated with the fluid in the volute, the other end of the second guide pipe extends to the right side wall, the left side wall is opened at a position corresponding to the end part of the first guide pipe, the right side wall is opened at a position corresponding to the end part of the second guide pipe, the first blowing and rolling component is arranged in the end part of the first guide pipe close to the left side wall, the second blowing and rolling component is arranged in the end part of, And the exhaust fume collecting hood is unfolded to the unfolded state outside the exhaust fume collecting hood under the action of pressure in the corresponding guide pipe.

Description

Fume exhaust fan

Technical Field

The invention relates to an oil fume purification device, in particular to a 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.

Before the household range hood is installed, a cabinet is designed and installed firstly according to the overall dimension of the range hood, an installation space position is reserved for the range hood, and the range hood is installed after the cabinet and the like are installed. Because the dimensions of the cupboard and the range hood have certain tolerance ranges, in order to ensure the smooth installation of the range hood when the range hood is installed, the dimensions of the ordinary cupboard reserve about 5mm more gaps for the left side and the right side of the range hood respectively. However, the gas flow speed at the narrow gap is very fast, when the smoke volume is very large and the range hood cannot timely suck and discharge all the oil smoke generated by cooking, the oil smoke near the range hood can quickly escape from the narrow gap, and the oil smoke escape condition of the range hood can be aggravated by the existence of the narrow gap.

The current general method is as follows: 1) the air quantity is increased, the suction and exhaust capacity of the range hood is improved, and all oil smoke is sucked and exhausted as soon as possible; 2) vertical protective separation baffles are arranged on two sides of the range hood, so that the depth of a smoke collecting cavity of the smoke collecting hood is increased, and more oil smoke can be buffered and contained in the cavity; 3) the side surface of the range hood is provided with a fixed baffle to eliminate the gap.

However, the above-described method causes the following problems: 1) the cost is increased, and the noise is increased; 2) the cooking operation of a user can be hindered, potential safety hazards exist, and the head of the user is easy to collide with the blocking plate; 3) affecting the appearance and not being accepted by the user.

Disclosure of Invention

The invention aims to solve the technical problem that the prior art is not enough, and provides a range hood which can prevent narrow slits from leaking smoke without affecting the running performance of a fan.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a range hood, includes collection petticoat pipe, sets up fan frame and the fan system of setting in the fan frame in collection petticoat pipe top, fan system includes the spiral case, the collection petticoat pipe includes left side wall and right side wall, its characterized in that: the range hood also comprises a smoke leakage prevention device arranged in the smoke collecting hood and the fan frame, the smoke leakage prevention device comprises a first guide pipe with two open ends, a first blowing and rolling part, a second guide pipe with two open ends and a second blowing and rolling part, one end of the first guide pipe is communicated with the fluid in the volute, the other end of the first guide pipe extends to the left side wall, one end of the second guide pipe is communicated with the fluid in the volute, the other end of the second guide pipe extends to the right side wall, the left side wall is opened at the position corresponding to the end part of the first conduit, the right side wall is opened at the position corresponding to the end part of the second conduit, the first coil blowing component is arranged in the end part of the first conduit close to the left side wall, the second coil blowing component is arranged in the end part of the second conduit close to the right side wall, the first blowing and rolling component and the second blowing and rolling component are both provided with a furling state which is contained in the corresponding guide pipe and a spreading state which is spread out of the smoke collecting hood under the action of pressure in the corresponding guide pipe.

In order to facilitate the communication between the guide pipe and the interior of the volute, the volute comprises an annular wall, a first pressure leading outlet and a second pressure leading outlet are formed in the annular wall, the first guide pipe is connected to the first pressure leading outlet and communicated with the fluid in the volute, and the second guide pipe is connected to the second pressure leading outlet and communicated with the fluid in the volute.

In order to enable the pressure led out from the two pressure leading positions to be equal, the volute further comprises a volute tongue and an air outlet, the first pressure leading outlet is close to the air outlet of the volute, the second pressure leading outlet is close to the volute tongue of the volute, the two pressure leading outlets extend along the axial direction of the volute, the distance between the first pressure leading outlet and the central axis of the volute is larger than the distance between the position on the annular wall, adjacent to the first pressure leading outlet, and the central axis of the volute, and the distance between the second pressure leading outlet and the central axis of the volute is larger than the distance between the position on the annular wall, adjacent to the second pressure leading outlet, and the central axis of the volute.

In order to facilitate leading out the static pressure of the first pressure leading position and the full pressure of the second pressure leading position, the first guide pipe is perpendicular to a tangent line of the volute at the first pressure leading outlet at a connecting part of the volute, the second guide pipe is coincident with the tangent line of the volute at the second pressure leading outlet at the connecting part of the volute, and the front surface of the second guide pipe faces to the fluid in the volute.

In order to facilitate the winding and the unfolding of the blowing and rolling component, the first blowing and rolling component and the second blowing and rolling component respectively comprise a connecting part, a film component and an elastic sheet, the connecting part is abutted and connected with the inner side of the side wall of the corresponding conduit, an air inlet is formed in one side, facing the volute, of the connecting part, the film component is arranged on one side, away from the volute, of the connecting part, the film component is hollow and communicated with fluid of the air inlet, and the elastic sheet is coated on the outer surface of the film component.

Preferably, the film member is made of PP, PVC or plastic.

In order to ensure that the roll blowing component is normally unfolded, the first roll blowing component and the second roll blowing component are cylindrical when in a rolled state, and both the first roll blowing component and the second roll blowing component satisfy the following relations: 8Pl⁵＝(D+D₀)Eab³A is the length of the elastic sheet, b is the thickness of the film member, E is the elastic coefficient of the elastic sheet, l is the extension length of the film member, D is the maximum diameter of the film member when it is rolled₀Is the minimum inner diameter, P, of the film member when it is wound₀The pressure P of the first conduit and the second conduit led out from the volute to the film component when the fan system works at the lowest gear is<P₀。

Compared with the prior art, the invention has the advantages that: the pressure of the fan system is led out, so that the blowing and rolling component is unfolded out of the smoke collecting hood under the action of the pressure, a reserved gap between the smoke collecting hood and the cabinet is filled, the oil smoke is prevented from leaking from the gap, the oil smoke absorption effect is improved, the operation performance of the fan is not influenced, and the oil smoke can not leak out of the fan system to cause indoor oil smoke pollution; overall structure is simple, and is not influenced to the whole appearance of range hood, need not solitary power supply design, and the cost is lower.

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 the range hood of the embodiment of the present invention in a non-operating state after installation;

FIG. 3 is an enlarged view of a portion I of FIG. 2;

FIG. 4 is a schematic view of an annular wall of a volute of a range hood according to an embodiment of the present invention;

FIG. 5 is a partial structural view of a duct and a volute according to an embodiment of the present invention;

fig. 6 is a schematic view of a blowing component of the smoke leakage prevention device of the range hood according to the embodiment of the invention;

FIG. 7 is a sectional view of the range hood according to the embodiment of the present invention in an installed state;

fig. 8 is an enlarged view of a portion ii of fig. 7.

Detailed Description

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

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 to 3, a range hood includes a fume collecting hood 1, a fan frame 2 disposed above the fume collecting hood 1, and a fan system 3 disposed in the fan frame 2. The fan system 3 includes a volute 31 and an impeller 32 disposed in the volute 31, and further includes a motor (not shown) for driving the impeller 32 to rotate. When installed, a gap 101 exists between each of the left and

right side walls

11 and 12 of the hood 1 and the cabinet 100 at the corresponding position.

In order to prevent the oil smoke from escaping from the gap 101 when the range hood is in operation, in the present application, the range hood further includes an oil smoke leakage prevention device disposed inside the exhaust fume collecting hood 1 and the air frame 2, and the oil smoke leakage prevention device includes a first duct 41, a first blowing and rolling component 42, a second duct 43, and a second blowing and rolling component 44. Including a first conduit 41, a first blow-coil component 42, a second conduit 43, and a second blow-coil component 44. With reference to fig. 4 and 5, the volute casing 31 includes a circumferential wall 313, a volute tongue 314 and an air outlet 315, the circumferential wall 313 is provided with a first pressure-inducing outlet 311 and a second pressure-inducing outlet 312, and both pressure-inducing outlets extend along the axial direction of the volute casing 31. The first pressure-inducing outlet 311 is close to the air outlet 315 of the scroll casing 31, and the second pressure-inducing outlet 312 is close to the tongue 314 of the scroll casing 31. The distance between the first pressure-inducing outlet 311 and the central axis of the volute casing 31 is greater than the distance between the adjacent position on the annular wall 313 and the central axis of the volute casing 31 (also the central axis of the impeller 32), and the distance between the second pressure-inducing outlet 312 and the central axis of the volute casing 31 (also the central axis of the impeller 32) is greater than the distance between the adjacent position on the annular wall 313 and the central axis of the volute casing 31 (also the central axis of the impeller 32). The position of the first pressure inducing outlet 311 is denoted as a first position a, and the position of the second pressure inducing outlet 312 is denoted as a second position B.

The first duct 41 has one end connected to the first pressure-inducing outlet 311 of the scroll case 31 and the other end extending to the left side wall 11 (which may also be the right side wall 12, preferably, connected to the closer side wall) of the smoke-collecting hood 1, and the second duct 43 has one end extending to the second pressure-inducing outlet 312 of the scroll case 31 and the other end connected to the right side wall 12 (which may also be the left side wall 11, connected to the closer side wall) of the smoke-collecting hood 1. The smoke collecting hood 1 is opened at the position corresponding to the end part of each conduit, and deformation glue coating can be arranged at the opening.

Because the range hood is an electrical appliance for sucking and exhausting oil smoke, negative pressure is generated by high-speed rotation of the impeller, the oil smoke is sucked into the impeller, partial oil stain in the oil smoke can be condensed on the surfaces of the impeller and the volute, the oil stain accumulated on the impeller reaches a certain quality, the oil stain can be thrown onto the annular wall of the volute due to the centrifugal force generated by rotation of the impeller, the oil stain accumulated on the annular wall of the volute has certain fluidity and can slowly flow and accumulate to the bottom of the volute, and the oil stain is guided into the oil cup through the oil leakage nozzle arranged at the bottom of the volute. Therefore, the pressure-inducing position is arranged on the upper side of the annular wall 313 of the volute 31 and cannot be arranged on the bottom of the volute 31.

Both ends of the first conduit 41 are open, thereby allowing the inside of the scroll case 31 and the first conduit 41 to be in fluid communication through the first pilot pressure outlet 311; the second conduit 43 is open at both ends, thereby allowing fluid communication between the interior of the volute 31 and the second conduit 43 through the second pilot pressure outlet 312. According to the flow field distribution in the volute 31 and the A, B position, P_AApproximately equal to the static pressure, P, at the first bleed pressure outlet 311_BApproximately equal to the full pressure at the second pilot pressure outlet 312. The first conduit 41 is perpendicular to a tangent of the volute 31 at the first position a at a connection portion with the volute 31, thereby introducing a static pressure at that point in the volute 31; the second conduit 43 coincides with a tangent of the volute 31 at the second position B at the connection portion with the volute 31, so that the full pressure at that point in the volute 31 is introduced, and the front of the second conduit 43 faces the fluid at the second position B in the volute 31.

A first blow-coil part 42 is provided in the first duct 41 at a position close to the left sidewall 11, and a second blow-coil part 44 is provided in the second duct 43 at a position close to the right sidewall 12, whereby the first blow-coil part 42 and the second blow-coil part 44 can protrude outside the smoke collecting hood 1. The first blowing and coiling component 42 takes the pressure P in the volute 31 from the first position A_ATaking the pressure P in the volute 31 from the second position B_B. The pressure taken from the two pressure-leading positions is approximately equal, the length and the bending degree of the two guide pipes are approximately equal, and the synchronous deformation of the two side coil blowing components can be ensured.

Referring to fig. 6, the first blowing and rolling part 42 and the second blowing and rolling part 44 have the same structure and each include a connection part 421, a film part 422, and an elastic piece 423. The connecting portion 421 abuts against and is connected to the inner side of the side wall of the corresponding duct, and an air inlet 424 is opened at a side thereof facing the scroll casing 31. The membrane component 422 is disposed on a side of the connecting portion 421 away from the scroll casing 31, the interior of the connecting portion is hollow, and is in fluid communication with the air inlet 424, the air flow enters the membrane component 422 only from the air inlet 424, and the membrane component 422 may be made of PP, PVC or plastic. The elastic sheet 423 is adhered and coated on the outer surface of the film component 422, so as to provide a supporting force for the film component 422 and keep the film component 422 in a cylindrical rolling trend.

When the motor of the fan system 3 works at the lowest gear, the pressure led out from the volute 31 and reaching each coil blowing component is P₀Ensuring that both blowing members are even at less than P₀The device can still be completely unfolded, and the following relation needs to be satisfied: 8Pl⁵＝(D+D₀)Eab³Wherein a is the length (dimension in the winding direction) of the elastic piece 423, b is the thickness of the film member 422, E is the elastic coefficient of the elastic piece 423, l is the unwinding length (the length is larger than the dimension of the gap 101) of the film member 422 (the elastic piece 423), D is the maximum diameter when the film member 422 is wound, and D is the maximum diameter when the film member 422 is wound₀Is the minimum inner diameter, P, of the film component 422 when it is wound<P₀。

Referring to fig. 7 and 8, after the fan system 3 starts to operate, the rotation speed N of the motor is gradually increased from 0 to the operating gear rotation speed N. The pressure at the first position a and the second position B is gradually increased, and through the pressure-inducing channel formed by the first conduit 41 and the second conduit 42, the pressure in the fan system 3 acts on the first coil blowing component 42 and the second coil blowing component 44, the first coil blowing component 42 and the second coil blowing component 44 are subjected to the pressure, the respective film component 422 is inflated and expanded, so as to push the elastic piece 423 to be flat and unfolded, and the elastic piece 423 and the film component 422 extend out of the corresponding conduit, so that when the range hood works, the two coil blowing components automatically block the gap 101 between the two sides and the cabinet 100, and the problem that oil smoke escapes from the gap 101 is avoided. If the fully deployed length of the membrane component 422 is greater than the width of the gap 101, deployment is stopped when the membrane component 422 is blocked by the cabinet 100, while still fully closing the gap 101. When the range hood stops working, the positive pressure in the fan system 3 disappears, the pressure in the thin film component 422 of the first blowing and rolling component 42 and the second blowing and rolling component 44 gradually disappears, and the thin film component 422 is automatically furled and restored to the cylindrical furled state and returned to the smoke collecting hood 1 by the elastic restoring deformation force of the elastic piece 423, so that the original appearance is maintained.

The smoke leakage prevention device is suitable for the condition that the gap 101 between the range hood and the cabinet 100 is large.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion, respectively), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion and/or be transported to the second portion, and may be a direct communication between the first portion and the second portion, or an indirect communication between the first portion and the second portion via at least one third element, such as a fluid channel, e.g., a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.

Claims

1. The utility model provides a range hood, includes collection petticoat pipe (1), sets up fan frame (2) and fan system (3) of setting in fan frame (2) in collection petticoat pipe (1) top, fan system (3) include spiral case (31), collection petticoat pipe (1) includes left side wall (11) and right side wall (12), its characterized in that: the range hood further comprises a smoke leakage prevention device arranged in the smoke collecting hood (1) and the wind rack (2), the smoke leakage prevention device comprises a first guide pipe (41) with two open ends, a first blowing and rolling component (42), a second guide pipe (43) with two open ends and a second blowing and rolling component (44), one end of the first guide pipe (41) is communicated with the fluid in the volute (31), the other end of the first guide pipe extends to the left side wall (11), one end of the second guide pipe (43) is communicated with the fluid in the volute (31), the other end of the second guide pipe extends to the right side wall (12), the left side wall (11) is opened at the position corresponding to the end part of the first guide pipe (41), the right side wall (12) is opened at the position corresponding to the end part of the second guide pipe (43), the first blowing and rolling component (42) is arranged in the end part, close to the left side wall (11), and the second blowing and rolling component (44) is arranged in the end part, close to the right side wall (12), of the second guide pipe (, the first blowing and rolling component (42) and the second blowing and rolling component (44) are both provided with a furled state which is received in the corresponding guide pipe and a furled state which is furled to the outside of the exhaust fume collecting hood (1) under the pressure action in the corresponding guide pipe.

2. The range hood of claim 1, wherein: the volute (31) comprises an annular wall (313), a first pressure guide outlet (311) and a second pressure guide outlet (312) are formed in the annular wall (313), the first guide pipe (41) is connected to the first pressure guide outlet (311) and communicated with fluid in the volute (31), and the second guide pipe (43) is connected to the second pressure guide outlet (312) and communicated with fluid in the volute (31).

3. The range hood of claim 2, wherein: the volute (31) further comprises a volute tongue (314) and an air outlet (315), the first pressure guiding outlet (311) is close to the air outlet (315) of the volute (31), the second pressure guiding outlet (312) is close to the volute tongue (314) of the volute (31), the two pressure guiding outlets extend along the axial direction of the volute (31), the distance between the first pressure guiding outlet (311) and the central axis of the volute (31) is larger than the distance between the adjacent position of the first pressure guiding outlet (311) and the central axis of the volute (31) on the ring wall (313), and the distance between the second pressure guiding outlet (312) and the central axis of the volute (31) is larger than the distance between the adjacent position of the second pressure guiding outlet (312) and the central axis of the volute (31) on the ring wall (313).

4. The range hood of claim 3, wherein: the first conduit (41) is perpendicular to a tangent of the volute (31) at the first pressure introduction outlet (311) at a connection portion with the volute (31), the second conduit (43) coincides with a tangent of the volute (31) at the second pressure introduction outlet (312) at a connection portion with the volute (31), and the front face of the second conduit (43) faces the fluid in the volute (31).

5. The range hood according to any one of claims 1 to 4, wherein: the first blowing and rolling component (42) and the second blowing and rolling component (44) respectively comprise a connecting portion (421), a film component (422) and an elastic sheet (423), the connecting portion (421) is abutted to and connected with the inner side of the side wall of a corresponding conduit, an air inlet (424) is formed in one side, facing the volute (31), of the connecting portion (421), the film component (422) is arranged on one side, away from the volute (31), of the connecting portion (421), the film component (422) is hollow and is communicated with the air inlet (424) in a fluid mode, and the elastic sheet (423) is coated on the outer surface of the film component (422).

6. The range hood of claim 5, wherein: the thin film component (422) is made of PP, PVC or plastic materials.

7. The range hood of claim 5, wherein: the first blowing and rolling component (42) and the second blowing and rolling component (44) are both cylindrical when in a rolling state, and the first blowing and rolling component (42) and the second blowing and rolling component (44) both satisfy the following relation: 8Pl⁵＝(D+D₀)Eab³A is the length of the elastic piece (423), b is the thickness of the film member (422), E is the elastic coefficient of the elastic piece (423), l is the extension length of the film member (422), D is the maximum diameter of the film member (422) when wound, and D is the maximum diameter of the film member (422)₀Is the minimum inner diameter, P, of the film component (422) during winding₀The pressure P of the first conduit (41) and the second conduit (43) led out from the volute (31) to the film component (422) when the fan system (3) works at the lowest gear is<P₀。