CN111380091B

CN111380091B - Filtering and noise-reducing device and range hood applying same

Info

Publication number: CN111380091B
Application number: CN201811621695.XA
Authority: CN
Inventors: 黄友根
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2022-05-17
Anticipated expiration: 2038-12-28
Also published as: CN111380091A

Abstract

The invention discloses a filtering and noise reducing device, which is characterized in that: including first silencer and second silencer, on oil smoke flow path, the second silencer is located the low reaches of first silencer, first silencer includes composite filter, composite filter sets up a plurality of confession oil smoke on the device and passes through and can get into the inlet air duct of second silencer, the second silencer includes by the one end that links to each other with first silencer to keeping away from the main part that first silencer direction extends, the main part links to each other with first silencer, and keep away from the equal opening of tip of first silencer, be formed with in the main part and constitute as the oil smoke passageway of venturi channel. A range hood that uses above filtration noise reduction device is still disclosed. Compared with the prior art, the invention has the advantages that: constitute first silencer, form the second silencer of venturi noise reduction passageway through composite filter, when filtering the oil smoke, realize the effect that full frequency range internal noise reduces.

Description

Filtering and noise-reducing device and range hood applying same

Technical Field

The invention relates to oil fume purification equipment, in particular to a filtering and noise reducing device and a range hood applying the filtering and noise reducing device.

Background

The range hood has become one of indispensable kitchen household electrical appliances in modern families, and the range hood generally comprises a top suction type range hood and a side suction type range hood, and the top suction type range hood has increasingly wide application due to the advantages of neatness, lightness, small occupied space and the like. The top-suction type range hood generally includes a fume collecting hood, a fan housing located on the fume collecting hood, and a volute, an impeller, and a motor for driving the impeller are installed in the fan housing.

The existing range hood has the problems of accumulation of oil stains in an air duct and high noise, and a metal net is adopted to filter the oil stains in the common solution, and a sound absorption device is adopted to reduce the noise. The bionic filter screen is arranged at a cage smoke hood at the lower end of a main machine of the range hood and is positioned at an air inlet at the upper end of an oil cup, a fan system with an air outlet is installed in the main machine, and the bionic filter screen is a cone or a rectangular cone or a square cone thin metal shell with a large upper part and a small lower part or a large upper part and a large lower part; also for example, the chinese patent with application number 201710210959.1 discloses a range hood, which includes: frame, fan subassembly and sound absorbing device, frame include bounding wall and apron, and the bounding wall links to each other with the apron in order to inject the installation cavity, and the fan subassembly is established in the installation cavity, is equipped with a plurality of micropores on the sound absorbing device, and sound absorbing device links to each other with bounding wall and/or apron in order to inject helmholtz resonant cavity, can set up in helmholtz resonant cavity rather than the shape suitable inhale sound cotton etc. to utilize sound absorbing material's the effect of inhaling, further inhale the sound and fall the noise.

These solutions, described above, present the following drawbacks: if the metal filter screen is adopted, the problem of poor filtering effect exists, so that the normal working period of the fan system is short; by adopting the sound absorption and noise reduction mode, the sound absorption material easily loses the sound absorption performance under the oil pollution environment, and the noise reduction effect is poor.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a filtering and noise reducing device, which can organically combine the filtering and noise reducing functions to improve the filtering and noise reducing effects.

The second technical problem to be solved by the invention is to provide a range hood with the filtering and noise reducing device.

The technical scheme adopted by the invention for solving the first technical problem is as follows: a filtering and noise reducing device is characterized in that: including first silencer and second silencer, on oil smoke flow path, the second silencer is located the low reaches of first silencer, first silencer includes composite filter, composite filter sets up the inlet air duct that a plurality of confession oil smoke pass through and can get into the second silencer, the second silencer includes by the one end that links to each other with first silencer to the main part of keeping away from first silencer direction extension, the main part links to each other with first silencer and keeps away from the equal opening of tip of first silencer, be formed with the oil smoke passageway that constitutes for the venturi channel in the main part.

Preferably, the air inlet channel is arranged in a honeycomb manner, so that a resistive silencer for eliminating medium-high frequency noise is formed.

Preferably, the air inlet channel is provided with at least two different sectional areas, the composite filtering device is formed by combining a porous filtering net and activated carbon, and the effect of sound pressure frequency spectrum difference compensation can be achieved due to different sectional wind speeds, so that medium-high frequency noise can be eliminated by utilizing the porous characteristic of the porous filtering net.

Preferably, the composite filter device is formed by combining a porous filter screen with activated carbon, or a high efficiency HEPA screen with activated carbon.

Preferably, the cross section of the oil smoke channel is gradually reduced from the joint with the first silencer and then gradually enlarged towards the direction far away from the first silencer, so that the oil smoke channel forms a venturi channel with the cross section being firstly reduced and then expanded, and a reactive silencer for eliminating low-frequency noise is formed.

Preferably, to further reduce noise, the main body is provided with a plurality of sound absorbing holes at one side of the portion with the expanded cross section.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides an use range hood that has as above device of making an uproar falls in filtration, includes the air inlet subassembly, sets up the box in air inlet subassembly top and sets up the power component in the box, its characterized in that: the filtering and noise reducing device is located upstream of the power assembly in the path of the lampblack flow.

Compared with the prior art, the invention has the advantages that: constitute first silencer, form the second silencer of the passageway of making an uproar falls in the venturi through composite filter device to combine first silencer and second silencer, when filtering the oil smoke, realize the effect that full frequency range noise reduces.

Drawings

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

fig. 2 is a sectional view (the section is front and back) of the range hood according to the embodiment of the present invention;

fig. 3 is a sectional view (the section is left and right direction) of the range hood according to the embodiment of the present invention;

FIG. 4 is a schematic view of a filtering and noise reducing device of a range hood according to an embodiment of the present invention;

fig. 5 is a sectional view of a filtering and noise reducing device of a range hood according to an embodiment of the present invention.

Detailed Description

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

Referring to fig. 1 to 3, a range hood includes an air intake assembly 1, a box body 2 disposed above the air intake assembly 1, a filtering and noise reducing device 3, a power assembly 4 disposed in the box body 2, and an air outlet assembly 5 as an air outlet component of the power assembly 4. In this embodiment, the air intake assembly 1 is a common exhaust fume collecting hood, and the power assembly 4 is a common centrifugal fan.

The filtering and noise reducing device 3 is arranged at the intersection of the box body 2 and the air inlet component 1 and is positioned below the power component 4, and on the oil smoke flow path, the filtering and noise reducing device 3 is positioned at the upstream of an air inlet of the power component 4, so that the oil smoke firstly enters the power component 4 after being filtered and noise reduced by the filtering and noise reducing device 3.

Referring to fig. 2, 4 and 5, the filtering and noise reducing device 3 includes a first muffler 31 and a second muffler 32, and the second muffler 32 is located downstream of the first muffler 31 in the soot flow path. The first muffler 31 comprises a composite filter device, and may be a porous filter net combined with activated carbon, a high efficiency HEPA net combined with activated carbon, or the like. The composite filter device is provided with a plurality of air inlet channels 311, the air inlet channels 311 penetrate through the upstream end surface and the downstream end surface of the first silencer 31 relative to the oil smoke flow path, and therefore the oil smoke can pass through the first silencer 31 through the air inlet channels 311. The plurality of air inlet channels 311 are arranged in a honeycomb manner to form a resistive muffler.

Preferably, the sectional area of each air inlet channel 311 has at least two different values, and the effect of sound pressure spectrum difference compensation can be achieved due to different sectional wind speeds, so that the porous characteristic of the porous filter screen can be utilized, and the first muffler 31 can mainly eliminate medium-high frequency noise.

The second muffler 32 includes a main body 321 extending from an end connected to the first muffler 31 to a direction away from the first muffler 31, and the main body 321 is connected to the first muffler 31 and the end away from the first muffler 31 is open for passing the oil smoke. The oil smoke passage 322 is formed in the main body 321, and the cross section of the oil smoke passage 322 gradually decreases from the connection with the first muffler 31 and then gradually increases in the direction away from the first muffler 31, so that the oil smoke passage 322 forms a venturi passage with a cross section that decreases first and then expands. The main body 321 is opened with a plurality of sound absorption holes 323 at one side of the portion where the cross section is expanded, and in the present embodiment, the sound absorption holes 323 are opened at a position of the main body 321 near the rear side of the cabinet 2. The second muffler 32 constitutes a reactive muffler, mainly eliminating low-frequency noise.

When the range hood works, oil smoke rises from a pot below the range hood, enters from the air inlet assembly 1, enters from the honeycomb-shaped air inlet channel 311 through the filtering and noise reducing device 3, and enters from disordered inlets, and simultaneously, oil smoke particles are contacted with the surface of the composite filtering device, so that the purpose of flow equalization can be achieved, and oil smoke separation and VOCs (volatile organic compounds) can be realized; after passing through the first muffler 31, the low-frequency noise enters the second muffler 32, and the low-frequency noise is reflected by using the change of the cross section of the Venturi channel, so that the low-frequency attenuation value is improved; the incident sound wave (downward propagation) of the noise and the oil smoke gas flow (upward flow) are different in direction, so that the noise can be attenuated, and the sound absorption hole 323 is adjacent to the cavity in the box body 2, so that the purpose of reducing the noise is further achieved.

By the combination of the first muffler 31 and the second muffler 32 described above, an effect of noise reduction in the entire frequency range is achieved.

If adopt the simple structure of making an uproar of falling, do not have the filter screen, then after the operation has for a long time, sound absorbing material loses its sound absorption performance easily under the greasy dirt environment, leads to the noise reduction effect not good, and the greasy dirt still can influence driving system's performance simultaneously. If the filter screen is adopted only and the noise reduction assembly is not arranged, the fussy noise is difficult to eliminate. The whole machine has larger running noise and influences the use. In the invention, after the noise reduction and the filtration are organically combined, the limited space in the box body 2 is fully utilized, and the effects of purification and noise reduction can be simultaneously achieved.

Claims

1. A filtering and noise reducing device is characterized in that: the oil smoke exhaust device comprises a first silencer (31) and a second silencer (32), wherein the second silencer (32) is positioned at the downstream of the first silencer (31) on an oil smoke flow path, the first silencer (31) comprises a composite filtering device, a plurality of air inlet channels (311) for oil smoke to pass through and enter the second silencer (32) are formed in the composite filtering device, and the air inlet channels (311) are arranged in a honeycomb manner to form a silencer resistance for eliminating medium-high frequency noise; the second silencer (32) comprises a main body (321) extending from one end connected with the first silencer (31) to the direction far away from the first silencer (31), the end part of the main body (321) connected with the first silencer (31) and the end part of the main body (321) far away from the first silencer (31) are both open, a lampblack channel (322) formed as a Venturi channel is formed in the main body (321), the cross section of the lampblack channel (322) is gradually reduced from the connection part of the lampblack channel and the first silencer (31) and then gradually enlarged towards the direction far away from the first silencer (31), so that the lampblack channel (322) forms the Venturi channel with the cross section being reduced firstly and then enlarged, and a reactive silencer for eliminating low-frequency noise is formed.

2. The filtering and noise reducing device according to claim 1, wherein: the air inlet channel (311) is at least provided with two different sectional areas, and the composite filtering device is formed by combining a porous filtering net and activated carbon.

3. The filtering and noise reducing device according to claim 1, wherein: the composite filtering device is formed by combining a porous filtering net and activated carbon or combining a high-efficiency HEPA net and activated carbon.

4. A filtering and noise-reducing arrangement according to any of claims 1 to 3, characterized in that: the main body (321) is provided with a plurality of sound absorption holes (323) at one side of the expanded cross-section portion.

5. A range hood applying the filtering and noise reducing device as claimed in any one of claims 1 to 4, comprising an air intake assembly (1), a box body (2) arranged above the air intake assembly (1) and a power assembly (4) arranged in the box body (2), characterized in that: the filtering and noise-reducing device (3) is located upstream of the power assembly (4) on the oil smoke flow path.