CN216557277U - Fume exhaust fan - Google Patents

Abstract

The utility model discloses a range hood, which comprises an air inlet assembly, a box body and a power device arranged in the box body, wherein the air inlet assembly is provided with an air inlet, a connecting pipeline is arranged between the air inlet assembly and the box body, the connecting pipeline is hollow to form an oil smoke channel, a filtering device is arranged in the oil smoke channel, and the filtering device comprises a fixed filtering layer and a dynamic filtering layer which are sequentially arranged from upstream to downstream at intervals; the dynamic filter layer can be in a first state of transverse extension and a second state of longitudinal extension, when in the first state, the dynamic filter layer occupies the cross section of the corresponding position of the oil smoke channel, and when in the second state, the dynamic filter layer is attached to or close to the inner side wall of the connecting pipeline. Compared with the prior art, the utility model has the advantages that: the mode that fixed filter layer and dynamic filter layer mutually support is adopted to adapt to the oil smoke purification problem in the oil smoke passageway under the different culinary art circumstances, prolong power device's life, reduce and change the cleaning frequency.

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.

The range hood has the following problems:

1. the fan mounting height of furred ceiling cigarette machine is higher, brings the cost-push of washing maintenance, in case oil smoke grease gathers in spiral case, impeller, and it is just very inconvenient to wash. And the self-cleaning means aiming at the components such as the impeller volute and the like by adopting the existing heating, ultrasonic waves and the like are adopted, so that the cleaning effect cannot be ensured after a long time, and the moving components of the fan are easy to damage, thereby bringing about the problems of noise increase and performance reduction.

2. At present, the oil net is mostly fixed in a single layer mode, different oil smoke concentrations can be generated due to different cooking modes, and the fixed oil net with a single structure cannot well match the oil smoke with different concentrations.

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, the filtering device comprises a fixed filtering layer and a dynamic filtering layer which are sequentially arranged from upstream to downstream at intervals on an oil smoke flow path, and the fixed filtering layer is fixedly arranged in the oil smoke passage; the dynamic filter layer can be in a first state of transverse extension and a second state of longitudinal extension, when in the first state, the dynamic filter layer occupies the cross section of the corresponding position of the oil smoke channel, and when in the second state, the dynamic filter layer is attached to or close to the inner side wall of the connecting pipeline.

Preferably, in order to facilitate the switching of the state of the dynamic filter layer, the dynamic filter layer comprises at least two layers arranged at intervals from upstream to downstream, each dynamic filter layer comprises a first subsection and a second subsection respectively arranged on two opposite side walls in the connecting duct, and each subsection can rotate relative to the connecting duct.

To facilitate driving the dynamic filter layers, each dynamic filter layer has a movement mechanism for driving the first and second sections in rotation.

Preferably, the fixed filter layer and the dynamic filter layer are both filter screens.

Preferably, the fixed filter layer is a 3D filter screen.

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

Preferably, the oil smoke concentration 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 gas flow velocity sensor is arranged at the downstream of the filter device on the oil smoke flow path.

Preferably, the gas flow rate 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 fixed filter layer and the dynamic filter layer are matched with each other to adapt to the problem of oil fume purification in oil fume channels under different cooking conditions, the service life of the power device is prolonged, and the replacement and cleaning frequency is reduced; through the multilayer filter layers, the effect of blocking the noise of the power device from being transmitted downwards along the flue is achieved while the oil fume purification is realized, and the operation noise of the ceiling range hood can be further reduced; the power device and the filter layer are adjusted by monitoring the concentration of the oil smoke and the wind speed in the flue, so that the flue resistance brought by the filter layer can be matched by adjusting the rotating speed of the power device when the filter layer filters, and the oil smoke purification and oil smoke absorption performances are considered.

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 open state) of the range hood according to the embodiment of the present invention;

fig. 3 is a schematic view of a first filter screen of a filtering device of a range hood according to an embodiment of the present invention;

fig. 4 is a schematic view of a second filter screen and a movement mechanism thereof of the filtering device of the range hood according to the embodiment of the utility model;

fig. 5 is a sectional view of the range hood according to the embodiment of the present invention (the second filter screen is in a closed state);

fig. 6 is a sectional view of the range hood according to the embodiment of the present invention (the second and third filters are closed);

fig. 7 is a sectional view of the range hood according to the embodiment of the present invention (the second, third, and fourth screens are closed);

fig. 8 is a control flow chart of the range hood according to the embodiment of the present invention.

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 4, 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 four 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 second, third, and fourth filters 52, 53, and 54 are rotatably disposed in the cooking fume passage 41, respectively. The first filter screen 51 is preferably disposed at a joint of the air intake assembly 1 and the connecting duct 4, and is a fixed filter screen extending transversely and always located in the lampblack channel 41 of the connecting duct 4, thereby always playing a role of filtering, and being a fixed filter layer. The first screen 51 is sized and shaped to fit in its installed position. Preferably, the first screen 51 is a 3D screen.

Second screen 52, third screen 53 and fourth screen 54 are then movable screens, being dynamic filtration layers. The connecting duct 4 includes a front side wall 42 and a rear side wall 43 arranged at a distance from each other in the front-rear direction, and further includes a left side wall 44 and a right side wall 45 arranged at a distance from each other in the left-right direction, the left side wall 44 being connected between left end portions of the front side wall 42 and the rear side wall 43, and the right side wall 45 being connected between right end portions of the front side wall 42 and the rear side wall 43. The second, third and fourth sieves 52, 53 and 54 are arranged in the connecting duct 4, have the same structure and respectively comprise a first section 521 and a second section 522, one of which is rotatably arranged inside the front wall 42 of the connecting duct 4 and the other of which is rotatably arranged inside the rear wall 432 of the connecting duct 4. The first and second sub-portions 521, 522 have a movement mechanism 55 that can independently or in conjunction drive the first and second sub-portions 521, 522 to rotate. Alternatively, one of the first and second portions 521, 522 may be rotatably disposed on the left sidewall 44 and the other may be rotatably disposed on the right sidewall 45. The second, third and fourth sieves 52, 53 and 54 may be independently moved, respectively, to be independently in two states.

Preferably, the moving mechanism 55 is a motor and a rotating shaft, so as to drive the first and second sub-parts 521 and 522 to open and close. Alternatively, a rotation driving mechanism such as an electric push rod capable of driving the filter screen to rotate may be used.

Thus, each of the other filtering layers, except the lowermost filtering mesh, can be in two states, as shown in fig. 7, which is in a first state of lateral extension, preferably a horizontal extension, occupying the entire cross section of the corresponding position of the cooking fume passage 41, where each filtering layer filters the cooking fume. As shown in fig. 2, it is in a second state of longitudinal extension, preferably vertical extension, and is respectively close to or close to the inner side wall of the connecting duct 4, at which time the filtering layers no longer filter the oil smoke.

In order to facilitate the automatic control of the movement of each filter layer, the range hood further comprises a lampblack concentration sensor 61 and a gas flow velocity sensor 62, wherein the lampblack concentration sensor 61 is arranged at the upstream of the filter device, the air inlet 11 of the air inlet assembly 1 is arranged, and the gas flow velocity sensor 62 is arranged at the downstream of the filter device, such as between the power device 3 and the filter device. The two sensors respectively detect the concentration of oil smoke and the flow rate of gas, are connected to a central control module of the range hood, and transmit real-time data so as to control the filtering device.

Referring to fig. 8, the method for controlling a range hood of the present invention includes the following steps:

1) firstly, acquiring oil smoke concentration N1 at the position of an air inlet 11 of a range hood when cooking soup and cooking food with small fire, oil smoke concentration N2 at the air inlet 11 of the range hood when cooking normally, and oil smoke concentration N3 at the air inlet 11 of the range hood when cooking with quick frying or heavy oil and heavy hot by using laboratory tests and user data acquisition, and acquiring air volume required for realizing better smoke exhaust effect by multiple tests and user evaluation, and converting the air volume to obtain the maximum air speed V2(N1< N2< N3, and V1< V2) when the filter screen realizes better oil separation effect under the concentration of gas flow velocity V1 and N2 in a flue under the working condition;

2) when the range hood operates, the oil smoke concentration sensor 61 installed at the position of the air inlet 11 of the range hood acquires the oil smoke concentration N in the oil smoke channel 41 at the moment and transmits data to the central control module through the sensor, and the gas flow velocity sensor 62 installed in the oil smoke channel 41 simultaneously detects the wind velocity V in the oil smoke channel 41 at the moment and performs corresponding control according to the detected oil smoke concentration and wind velocity:

2.1) if N is smaller than a preset value N1, determining that the cooking mode is in, at this time, the air quantity required by smoke exhaust is small, and the oil separation can be realized only by opening the fixed filter screen at the lowest part, at this time, all the movable filter screens are in an open state, referring to fig. 2, if the air speed V is greater than a preset value V1, the central control module sends an instruction to reduce the motor rotating speed of the power device 3, so that the air speed in the oil smoke channel 41 is reduced to V1, and the oil smoke filtering effect is realized while the smoke exhaust effect is ensured;

2.2) if the oil smoke concentration N is greater than N1 and less than N2, it indicates that the cooking state is normal cooking state, the second filter screen 52 is closed, the contact area between the rising oil smoke and the filter device is increased, and the filtering capacity of the oil smoke in the oil smoke channel 41 is improved, see fig. 5;

2.3) if the oil smoke concentration N is greater than N2 and less than N3, the oil smoke purifying capability of the filtering device needs to be further enhanced, and the second filter screen 52 and the third filter screen 53 are both in a closed state, see fig. 6; meanwhile, the oil smoke flow velocity V is obtained through the gas flow velocity sensor 62 in the oil smoke channel 41, if V is smaller than V1 at this time, it indicates that the range hood cannot achieve a better smoke exhaust effect, the rotation speed of the motor of the power device 3 needs to be increased, and the air exhaust amount of the range hood is increased until V is larger than V1; if V is larger than V2, the wind speed at the moment needs to be reduced to prolong the contact time of the oil smoke and the filter screen, so that a better oil separation effect is realized;

2.4) if oil smoke concentration N is greater than preset value N3, indicate that the kitchen is being in the mode of stir-fry or the cooking of other more oil smoke, need preferentially guarantee smooth discharge of oil smoke in the kitchen, simultaneously through intercepting the grease in the oil smoke as far as in oil smoke passageway 41, avoid the grease in the impeller of power device 3 and the regional adhesion of motor, transmit the signal through central control module, close all movable filter screens, see figure 7, the area of contact of filter screen and oil smoke reaches the biggest promotion, the filter capacity further promotes, to the motor speed control of power device 3 simultaneously, guarantee that the wind speed is on the required wind speed of discharging fume in oil smoke passageway 41.

Through this kind of control mode periodically obtain oil smoke concentration and wind speed when range hood moves, through the parameter value of predetermineeing, the culinary art state in the discernment kitchen, automatic matching most suitable oil smoke purification structure and fan power, compromise smoke exhaust effect and leading oil smoke purifying effect that can be better, with the oil smoke interception in connecting tube 4, greatly reduce the oil and fat and adhere to on power device 3's impeller to reach and exempt from abluent effect.

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 (10)

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): a filtering device is arranged in the oil smoke channel (41), and on an oil smoke flow path, the filtering device comprises a fixed filtering layer and a dynamic filtering layer which are sequentially arranged from upstream to downstream at intervals, and the fixed filtering layer is fixedly arranged in the oil smoke channel (41); the dynamic filter layer can be in a first state of transverse extension and a second state of longitudinal extension, when in the first state, the dynamic filter layer occupies the cross section of the corresponding position of the oil smoke channel (41), and when in the second state, the dynamic filter layer is attached to or close to the inner side wall of the connecting pipeline (4).

2. The range hood of claim 1, wherein: the dynamic filter layer comprises at least two layers which are arranged from upstream to downstream at intervals, each dynamic filter layer comprises a first subsection (521) and a second subsection (522) which are respectively arranged on two opposite side walls in the connecting pipeline (4), and each subsection can rotate relative to the connecting pipeline (4).

3. The range hood of claim 2, wherein: each dynamic filter layer has a movement mechanism (55) for driving the first section (521) and the second section (522) in rotation.

4. The range hood according to any one of claims 1 to 3, wherein: the fixed filter layer and the dynamic filter layer are both filter screens.

5. The range hood of claim 4, wherein: the fixed filter layer is a 3D filter screen.

6. The range hood of claim 1, wherein: a smoke concentration sensor (61) is arranged on the smoke flow path and at the upstream of the filtering device.

7. The range hood of claim 6, wherein: the oil smoke concentration sensor (61) is arranged at the air inlet (11).

8. The range hood of claim 6, wherein: a gas flow rate sensor (62) is provided downstream of the filter device on the soot flow path.

9. The range hood of claim 8, wherein: the gas flow rate sensor (62) is arranged between the power device (3) and the filtering device.

10. The range hood according to any one of claims 1 to 9, wherein: the power device (3) is a fan system arranged above the kitchen ceiling.

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