CN216079979U - Fume exhaust fan - Google Patents

Abstract

The utility model discloses a range hood, which comprises an air inlet component, a box body and a power device arranged in the box body, wherein an air inlet is formed in the air inlet component, a connecting pipeline is arranged between the air inlet component and the box body, and the connecting pipeline is hollow to form an oil smoke channel, and is characterized in that: the oil smoke passage is internally provided with a filtering device, on the oil smoke flow path, the filtering device comprises at least two filtering layers which are sequentially arranged from the upstream to the downstream at intervals, and the size of the filtering passage for the oil smoke to pass through is sequentially reduced from the upstream to the downstream by each filtering layer. Compared with the prior art, the utility model has the advantages that: through set up multilayer structure's filter equipment in the long wind channel between air inlet subassembly and fan system, balanced the oil smoke velocity of flow, the noise is kept away from the people ear, and the oil smoke filter effect is better, and has reduced the produced noise of filtration oil smoke.

Description

Fume exhaust fan

Technical Field

The utility model 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.

The range hood that currently commonly uses adopts leading filter screen to carry out prefiltering to the oil smoke, reduces wind channel, long-pending oily problem, reduces harmful substance such as oil smoke simultaneously and discharges. The novel lifting tower type range hood disclosed in the Chinese patent with the application number of 201721445887.0 comprises a machine body, wherein a smoke suction cavity is formed in the machine body, an opening is formed below the machine body, a main machine lifting shell is arranged in the opening, an air inlet is formed below the main machine lifting shell, the air inlet is communicated with the smoke suction cavity, and a filter screen is arranged at the air inlet.

Above-mentioned this kind of range hood, its filter screen of using is mostly the individual layer fixed, has following problem:

1. if the filter screen with good filtering effect is adopted, the resistance coefficient is large, smoke is easy to leak under any working condition, and although the emission and the cleanliness of the cavity of the range hood meet the requirements, the oil smoke escapes and loses the due effect of the range hood; if the filter screen with a common filtering effect is adopted, although the oil smoke absorption effect is ensured, the emission and the cavity purification degree are not obviously improved.

2. Different cooking modes can cause different oil smoke concentrations and water vapor amounts, and the fixed filter screen with a single structure can not be well matched with the fixed filter screen.

3. The filter screen is positioned at the air inlet at the front end, the noise generated by the oil smoke passing through the filter screen is too close to the ears of a person, and the use comfort is poor; the air inlet has uneven flow velocity, the oil smoke is easily concentrated in a local large flow velocity area, oil is easily dripped, and the filtering effect is poor due to local oil accumulation.

Therefore, further improvements are desired.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the utility model is to provide a range hood to reduce noise and improve filtering effect aiming at the defects of the prior art.

The second technical problem to be solved by the utility model is to provide a range hood aiming at the defects in the prior art, which can realize air intake and filtration, ensure air intake capability and filtration efficiency.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: the utility model provides a range hood, includes air inlet subassembly, box and the power device of setting in the box, the air intake has been seted up on the air inlet subassembly, be provided with connecting tube between air inlet subassembly and the box, be cavity and constitute oil smoke passageway, its characterized in that in the connecting tube: the oil smoke passage is internally provided with a filtering device, on the oil smoke flow path, the filtering device comprises at least two filtering layers which are sequentially arranged from the upstream to the downstream at intervals, and the size of the filtering passage for the oil smoke to pass through is sequentially reduced from the upstream to the downstream by each filtering layer.

Preferably, filter equipment includes the three-layer filter layer, is respectively by upper reaches to low reaches interval arrangement's first filter screen, second filter screen and third filter screen in proper order, the filtration passageway is the mesh of each filter screen.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: each filter layer can independently be in a first state of transversely extending and a second state of longitudinally extending, when in the first state, each filter layer occupies the cross section of the corresponding position of the oil smoke channel, and when in the second state, each filter layer is close to or close to the inner side wall of the connecting pipeline.

In order to drive the filter layers to switch between two states, the filter device further comprises a movement mechanism corresponding to each filter layer, and each filter layer is rotatably connected with the inner side wall of the connecting pipeline so as to be driven by the corresponding movement mechanism to rotate relative to the connecting pipeline.

Preferably, the motion mechanism is an electric push rod, the electric push rod is rotatably arranged on the inner side wall of the connecting pipeline, and the output end of the electric push rod is connected with the corresponding filter layer.

In order to prevent the filtering layers of the light oil stains from being polluted by the filtering layers of the heavy oil stains, the filtering layers are sequentially arranged in the connecting pipeline at intervals from bottom to top, and at least the filtering layer positioned at the top is positioned at different sides in the connecting pipeline when being in the second state and other filtering layers are positioned in the second state.

In order to control the state of the filter layer and the working state of the power device conveniently, a first oil smoke sensor is arranged on the upstream of the filter device on the oil smoke flow path.

Preferably, the first oil smoke sensor is arranged at the air inlet.

In order to further adjust the state of the filter layer and the working state of the power device, a second oil smoke sensor is arranged on the downstream of the filter device on the oil smoke flow path.

Preferably, the second lampblack sensor is arranged between the power device and the filtering device.

Preferably, the power device is a fan system for placement above a kitchen ceiling.

Compared with the prior art, the utility model has the advantages that: the filtering device with the multilayer structure is arranged in the long air channel between the air inlet assembly and the fan system, so that the oil smoke flow velocity is balanced, the noise is far away from ears of people, the oil smoke filtering effect is better, and the noise generated by oil smoke filtering is reduced; by changing the state of the filter layer, the balance of oil smoke absorption and filter effects is ensured, and different oil smoke modes can be adapted; the filter layer may be in a longitudinally extending condition so as to prevent oil from collecting on the filter layer and being collected by flowing down.

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 (screen closed state) of the range hood according to the embodiment of the present invention;

FIG. 3 is a schematic view of a filter device of a range hood according to an embodiment of the present invention;

fig. 4 is a sectional view (screen open state) of the range hood according to the embodiment of the present invention;

fig. 5 is a sectional view of the range hood according to the embodiment of the present invention (the filter screen is opened, which is different from the view in fig. 4).

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 to 3, a range hood comprises an air intake assembly 1, a box body 2 and a power device 3 arranged in the box body 2. The air inlet component 1 is provided with an air inlet 11, and in this embodiment, the air inlet 11 is located at the bottom of the front side of the air inlet component 1. Preferably, the power means 3 is in this embodiment a fan system, in particular a centrifugal fan, and the housing 2 constitutes a fan frame.

In this embodiment, the box body 2 and the power device 3 are installed above the ceiling to form the ceiling range hood. Therefore, there is a longer distance between the air intake component 1 and the box body 2, so that a connecting pipe 4 is arranged between the air intake component 1 and the box body 2, the connecting pipe 4 is cuboid and hollow, and a longer oil smoke channel 41 is formed in the connecting pipe. Through the oil smoke channel 41, the air inlet 11 of the air inlet component 1 is in fluid communication with the power device 3 in the box body 2, and oil smoke can enter the range hood from the air inlet 11 and is finally discharged to the outside or the inside from the power device 3 to form internal circulation.

In this oil smoke passageway 41, the oil smoke gas stream is comparatively stable, and the velocity of flow is comparatively even, consequently is provided with filter equipment in it, compares in the solution that traditional lampblack absorber is located the range hood air intake, and the whole velocity of flow is even, and the oil smoke filter effect is good. The filtering device comprises at least two filtering layers which are sequentially arranged from bottom to top (namely on the oil smoke flowing path from upstream to downstream) at intervals, different oil smoke modes can be adapted to, and the shape and the size of each filtering layer are respectively matched with the cross section of the oil smoke channel 41. Each filter layer has a filter passage (not shown) through which soot passes, the size of the filter passage decreasing from bottom to top in turn. In this embodiment, filter screens are selected as the filter layers, and three filter layers are provided, namely, a first filter screen 51, a second filter screen 52 and a third filter screen 53 which are sequentially arranged from bottom to top, and the respective mesh (filter channel) apertures of the first filter screen 51, the second filter screen 52 and the third filter screen 53 are sequentially reduced.

The first filter 51, the second filter 52, and the third filter 53 are rotatably provided in the smoke passage 41, respectively, and can rotate about an axis extending forward and backward (or extending left and right). To facilitate driving the first, second and third sieves 51, 52, 53 in rotation, the filtering device further comprises a first movement mechanism 54, a second movement mechanism 55 and a third movement mechanism 56, each of which is independently actuatable to independently drive the first, second and third sieves 51, 52, 53 in rotation. Preferably, the first movement mechanism 54, the second movement mechanism 55 and the third movement mechanism 56 are all electric push rods, which are rotatably disposed on the inner side wall of the connecting pipe 4, and the output ends of the electric push rods are connected with the corresponding filter layers.

Thus, each filter layer can assume two states, as shown in fig. 2, which assume a first, preferably horizontally extending state extending transversely over the entire cross-section of the respective position of the cooking vapour passage 41, in which case the respective filter layer filters the cooking vapour. As shown in fig. 4 and 5, it is in the second state of longitudinal extension, preferably the vertical extension state, and is respectively attached to or close to the inner side wall of the connecting pipe 4, at this time, each filter layer no longer filters the oil smoke, and in this state, it is convenient for the oil to slide into the oil smoke channel 41 from each filter layer, and the first filter screen 51 and the second filter screen 52 which are adsorbed by the light oil stains and the third filter screen 53 which is heavily polluted are located on different sides, so as to prevent the first filter screen 51 and the second filter screen 52 which are adsorbed by the light oil stains from being polluted. In the present embodiment, the first and second sieves 51 and 52 are positioned at the rear side in the connecting duct 4, and the third sieve 53 is positioned at the front side in the connecting duct 4. The second and third sieves 52 and 53 also function to guide oil.

Referring to fig. 5, in order to automatically control the movement of each filter layer, the range hood further includes a first soot sensor 61 and a second soot sensor 62, the first soot sensor 61 is disposed upstream of the filter device, the air inlet 11 of the air inlet assembly 1, and the second soot sensor 62 is disposed downstream of the filter device, such as between the power device 3 and the filter device. And controlling the filtering device according to the oil smoke concentrations detected by the two oil smoke sensors.

The range hood of the utility model has the following oil smoke modes: single water vapor, small water vapor and small oil smoke, small water vapor and large oil smoke, large water vapor and small oil smoke, large water vapor and large oil smoke and single oil smoke. The first oil smoke sensor 61 is used for monitoring an oil smoke mode in a current cooking state, judging the oil smoke mode, adjusting a filtering strategy of the filtering device, and enabling the power device 3 to perform corresponding rotation speed change to meet an oil smoke absorption effect. The filtering strategy and the rotating speed change of the power device 3 aim to meet the filtering requirement as far as possible while ensuring the oil smoke absorption effect.

The filtering strategy can have the following six types:

the method comprises the following steps of: the whole oil smoke escape is small, the oil smoke pollution is free, the filtering device is in a fully open state, and the whole working condition is completed by a small-grade low fan rotating speed;

small water vapor and small oil smoke: the whole oil smoke escape is small, the oil smoke pollution is small, the filtering device adopts the state that the first filter screen 51 is closed, other filter layers are opened, and the whole working condition is completed by a low-gear low fan rotating speed;

③ small water vapor and large oil fume: in the whole oil smoke escape, the oil smoke pollution is large, the filtering device adopts a third filter screen 53 to close, other filter layers adopt an open state, and the whole working condition is finished by the rotating speed of the fan in the middle gear;

fourthly, large water vapor and small oil smoke: in the whole oil smoke escape, the oil smoke pollution is small, the filtering device adopts the state that the first filter screen 51 is closed and other filter layers are opened, and the whole working condition is completed by a low-gear low fan rotating speed;

large water vapor and large oil smoke: the whole oil smoke escapes greatly, the oil smoke pollution is large, the filtering device adopts a state that the second filter screen 52 and the third filter screen 53 are closed and the first filter screen 51 is opened, and the whole working condition is finished by the rotating speed of the high-grade high-speed fan;

sixthly, single oil smoke: the whole oil smoke escapes greatly, the oil smoke pollution is large, the filtering device adopts a state that the second filter screen 52 and the third filter screen 53 are closed and the first filter screen 51 is opened, and the whole working condition is finished by the rotating speed of the fan in the middle gear;

the second soot sensor 62 is used to monitor the filtered soot concentration for readjustment: if the oil smoke concentration detected by the first oil smoke concentration sensor 61 is kept or is smaller than the initial value, the oil smoke does not escape, and the rotating speed of the power device 3 is kept; on the contrary, the oil smoke has the escape risk, and at this time, the rotating speed of the power device 3 needs to be increased to prevent the oil smoke from escaping.

The concentration of the oil smoke detected by the second oil smoke sensor 62 is low and meets the requirement, the concentration is kept unchanged, and on the contrary, an opened filter layer is added on the original strategy. The strategy is a strategy aiming at single water vapor, for the oil smoke mode, oil smoke escape is small, oil smoke pollution is small, data collected by the second oil smoke sensor 62 cannot be increased basically, and the original strategy can meet the requirements sufficiently. Strategies II and IV include increasing the second filter screen 52, if the numerical value obtained by the second oil smoke sensor 62 cannot be met, retracting the second filter screen 52, changing the third filter screen 53 into increasing the rotating speed of the power device 3 to offset filter screen resistance (in a small water vapor and small oil smoke mode, the oil smoke concentration may be increased, but the whole concentration cannot reach a large oil smoke mode, so that a two-layer oil screen strategy is adopted). Strategy (c) first increase first filter screen 51, if second oil smoke sensor 62 obtains numerical value still can not satisfy, pack up first filter screen 51, increase second filter screen 52, if still unsatisfied, increase first filter screen 51, second filter screen 52 simultaneously, increase the 3 rotational speeds of power device and offset the filter screen resistance (under the big oil smoke mode, in order to ensure the filter effect, can adopt 3 layers of filter screen strategies at most). Strategy fifthly, if the oil smoke concentration data detected by the second oil smoke sensor 62 is not satisfied, the first filter screen 51 is added, and the rotating speed of the power device 3 is increased to offset the filter screen resistance.

When the range hood is shut down, each filter layer is in the second state, and oil can be guided downwards to the collected container.

According to the scheme of the utility model, the long air channel of the ceiling range hood is utilized, so that the filtering device is positioned in the long air channel and is close to the upper position, noise generated by oil smoke passing through the filtering device is far away from human ears, and uniform flow velocity is lower than large difference flow velocity noise under the same air quantity. The whole scheme balances the oil smoke flow velocity, the noise is far away from the ears of people, the oil smoke filtering effect is better, and the noise generated by oil smoke filtering is reduced. The oil screen in the filtering device can be vertical in a shutdown state, and the method can prevent oil smoke from being gathered on the oil screen and dropping.

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 (11)

1. The utility model provides a range hood, includes air inlet subassembly (1), box (2) and sets up power device (3) in box (2), air intake (11) have been seted up on air inlet subassembly (1), be provided with connecting tube (4) between air inlet subassembly (1) and box (2), be cavity and constitute oil smoke passageway (41), its characterized in that in connecting tube (4): the oil smoke passage (41) is internally provided with a filtering device, on an oil smoke flow path, the filtering device comprises at least two filtering layers which are arranged at intervals from upstream to downstream in sequence, and the sizes of the filtering passages for the oil smoke to pass through are reduced in sequence from the upstream to the downstream.

2. The range hood of claim 1, wherein: the filter device comprises three filter layers, namely a first filter screen (51), a second filter screen (52) and a third filter screen (53) which are sequentially arranged from upstream to downstream at intervals, and the filter channel is a mesh of each filter screen.

3. The range hood of claim 1 or 2, wherein: each filter layer can independently be in a first state extending transversely and a second state extending longitudinally, when in the first state, each filter layer occupies the cross section of the corresponding position of the lampblack channel (41), and when in the second state, each filter layer is close to or close to the inner side wall of the connecting pipeline (4).

4. The range hood of claim 3, wherein: the filter device also comprises a movement mechanism corresponding to each filter layer, and each filter layer is rotatably connected with the inner side wall of the connecting pipeline (4) so as to be driven by the corresponding movement mechanism to rotate relative to the connecting pipeline (4).

5. The range hood of claim 4, wherein: the movement mechanism is an electric push rod, the electric push rod is rotatably arranged on the inner side wall of the connecting pipeline (4), and the output end of the electric push rod is connected with the corresponding filter layer.

6. The range hood of claim 3, wherein: the filter layers are sequentially arranged in the connecting pipeline (4) at intervals from bottom to top, and at least the filter layer positioned at the top is positioned at different sides in the connecting pipeline (4) when being in the second state and the other filter layers are in the second state.

7. The range hood of claim 3, wherein: a first soot sensor (61) is provided upstream of the filter device on the soot flow path.

8. The range hood of claim 7, wherein: the first oil smoke sensor (61) is arranged at the air inlet (11).

9. The range hood of claim 7, wherein: a second soot sensor (62) is disposed downstream of the filter device on the soot flow path.

10. The range hood of claim 9, wherein: the second lampblack sensor (62) is arranged between the power device (3) and the filtering device.

11. The range hood of claim 1 or 2, wherein: the power device (3) is a fan system arranged above the kitchen ceiling.

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