CN201028672Y - Oil smoke filter - Google Patents
Oil smoke filter Download PDFInfo
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- CN201028672Y CN201028672Y CNU2007201077858U CN200720107785U CN201028672Y CN 201028672 Y CN201028672 Y CN 201028672Y CN U2007201077858 U CNU2007201077858 U CN U2007201077858U CN 200720107785 U CN200720107785 U CN 200720107785U CN 201028672 Y CN201028672 Y CN 201028672Y
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Abstract
The utility model discloses a lampblack filtering device, which contains at least two layers of filtering board with a vent. Every two neighboring vents on the filtering board are mutually vicarious positioned, which are characterized in that the edges of the vents have a molded flanging facing the inner of an exhaust hood. The utility model has advantages that: have well lampblack filtering effect, little in wind quantity loss, low in noise, can effectively extend the maintenance free time of the fan system of the exhaust hood; thus the utility model is in particular suitable to filter the lampblack of the exhaust hood.
Description
Technical Field
The utility model relates to a fume filtering device of a range hood.
Background
At present, the oil fume filtering device arranged at the air inlet of the range hood mainly has four modes:
the first is to use one or more dense filter screens of fine filaments, which are passed through micropores to complete the filtration. However, the aperture of the mesh is much larger than the diameter of oil drops mixed in the oil smoke, so that the capacity of filtering the oil smoke is limited, and the smaller the mesh is, the more easily the oil stains are accumulated on the periphery of the mesh, so that the mesh is reduced and even blocked, the air inlet quantity of the range hood is seriously influenced, and the total oil smoke removing effect of the range hood is influenced. More importantly, the filter screens are difficult to clean after being adhered with oil stains, so that users are not very troubled, and the filter screens can only be replaced after being used for a period of time, thus the use cost is high.
The second is a single-layer perforated plate type filter device, in which the perforated plate is a flat plate, i.e. the edge of the perforated plate is flush with the surface of the perforated plate, as shown in fig. 1, the flat plate has a long waist hole, when the airflow (the pumped oil smoke wind) enters the long waist hole, a large number of vortices are generated at both sides of the hole, and the vortices increase the noise. Meanwhile, due to the structure of the holes, for viscous fluid, the area of the actual vent is reduced greatly, so that the air volume is reduced greatly, and the air volume loss of the filter device is 10-15%. In addition, when noise exists inside and is transmitted outside, the plate holes are straight through (for sound channels), so the noise is large. Furthermore, the oil smoke is deposited more at the position just because of the larger and more vortexes existing behind the plate holes, and the required cleaning work is more frequent, namely the maintenance-free time is shorter. On the basis, a filtering device adopting a staggered and superposed form of two layers of flat plates with holes is adopted, the filtering effect is relatively better compared with that of a single layer, but the comprehensive oil smoke removal performance of the range hood is not improved due to larger air loss, and the problems of noise, oil smoke deposition and the like similar to those of the single layer flat plate exist.
The third is to use a filtering device with a perforated plate and a filtering net superposed, which has the disadvantages of the two.
The fourth is the oil smoke filtering device adopting two layers of inverted buckle type perforated filtering plates, which is commonly seen in Europe and America, such as the structure disclosed in U.S. Pat. No. 4,944,782 and German patent DE4016582A 1. There are many patents in China, such as "oil fume filter plate" disclosed in CN02127958.6, "oil fume filter plate" disclosed in CN02245034.3, "oil fume purifying cover and its oil fume purifier" disclosed in CN200510017502.6, and "CN 200520030424.9" disclosed in themOpened 'oil fume purification cover and oil fume purifier' and 'condensed oil fume purification cover and oil fume purifier' disclosed in CN200510017649.5,A "spiral suction type cooking fume purifier" disclosed in CN89213582.4, a "cooking fume purifier" disclosed in CN98235540.8, an "improved cooking fume filter structure" disclosed in CN01222817.6, an "adsorption type cooking fume filtering grid" disclosed in CN02271373.5, a "cooking fume exhauster oil filter screen" disclosed in CN03232458.8, a "cooking fume exhauster" disclosed in CN200520063783.4, and a "filter device" disclosed in CN200520059011.3, and so on. The structure disclosed in these patents can be seen in fig. 2, in which two filter plates are arranged in a staggered manner, the plate surface of the flat plate is provided with elongated flanged holes, and the flanges of the upper and lower plates are arranged in opposite directions. The flow channel formed by the first layer of flanging hole is matched with air flow, so that the vortex can be reduced, and the second layer of filtering plate which is relatively arranged in a staggered way blocks the passage of sound which is directly transmitted outwards, so that the noise is reduced. However, due to the influence of the shape of the filter plates arranged in the second layer in a relatively staggered manner, the turning is increased to cause the gas path to become zigzag, and due to the reverse arrangement of the upper panel, the turned gas flow actually meets a flat plate hole, so that the edge of the hole (the turned flat plate hole) generates vortex, and the vortex can be reduced only by enlarging the gap between the two layers of filter plates, but the problem cannot be solved completely (only the influence is reduced). Because the oil fume gas must pass through the airflow channel of the double-layer filter plate, the zigzag channel and the plate hole (generating vortex) after turning, the air quantity loss of the oil fume filter device with the structure is large, and even if the distance between the two layers of filter plates is increased (the distance between the two layers is 2mm-10 mm), the air quantity still loses 3-5 m compared with the single-layer plate type filter screen 3 And/min, the air volume loss is up to 30 percent. The air flow channel which is not bent and the relationship between the change direction of the air flow at the corner and the vortex, so that the air quantity loss of the oil fume filtering device is large, but the filtering effect of the oil fume gas entering the range hood is relatively good, and generally speaking, the mode reduces the suction quantity (the air quantity is reduced too much) of the oil fume gas, so that the comprehensive oil fume suction comprehensive performance of the range hood is largeIs a decrease.
Disclosure of Invention
The utility model aims to solve the main technical problem that lie in providing a good and few oil smoke filter equipment of amount of wind loss of oil smoke filter effect to the prior art current situation.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the oil fume filtering device comprises at least two layers of filtering plates, wherein the filtering plates are provided with ventilation holes, the ventilation holes in the two adjacent layers of filtering plates are arranged in a staggered mode, and the oil fume filtering device is characterized in that the periphery of the ventilation holes is formed to be flanged, and the flanging directions of the ventilation holes in all the filtering plates face towards the inside of the range hood.
The number of layers of the filter plate is preferably two by comprehensively considering the manufacturing cost, the air volume and the oil smoke removing effect.
The filter plate may have a curved shape or a flat shape, but is preferably a flat shape in view of easy manufacturing and installation.
The vent holes may be circular holes, elliptical holes, square holes, or the like, or may be elongated holes, but are preferably elongated from the viewpoint of manufacturing, air volume, oil collection, or the like.
The cross-sectional shape of the plate wall between the adjacent ventilation holes on the filter plate is arc-shaped, and the shape is favorable for smooth flow of oil smoke, improves the air volume, reduces vortexes and reduces noise.
The width of the vent hole is preferably 2 to 20mm.
The height of the flanging of the vent hole is preferably 1-8 mm.
The gap between two adjacent layers of the filter plates is preferably 1-5 mm.
The filter plates are obliquely arranged relative to the horizontal plane, and therefore the plate walls between the adjacent ventilation holes on the filter plates are obliquely arranged, so that oil stains are guided to the oil collecting cup.
In the adjacent two layers of the filter plates, the width of the plate wall between the adjacent ventilation holes on the upper layer filter plate is larger than or equal to the width of the ventilation hole + 0-5 mm at the corresponding part on the lower layer filter plate, namely the width of the upper layer plate wall is equal to or slightly larger than the width of the ventilation hole at the lower layer, so that the filter plates are not only favorable for attractiveness, but also favorable for improving the oil smoke filtering effect, and are favorable for effectively blocking the direct transmission of the internal noise of the range hood. On this basis, it is preferable that the width and the pitch of the ventilation holes in each layer of the filter plate are equal.
The utility model discloses there is following beneficial effect:
the amount of wind increases, can utilize the filter equipment of air intake to filter fume gas simultaneously again betterly, the utility model discloses an syntropy dislocation filter device more than bilayer or bilayer, because the streamline of air current in flow process is basically the same with the shape of double-deck filter, the swirl of board shell department has not, and the resistance is very reduced than the flat board, through the clearance (for example 1mm ~ 5 mm) of proper adjustment double-deck filter, the amount of wind can increase 0.3 ~ 1.5m than board-like filter screen 3 Min, the wind resistance is extremely small, and the air loss is only 3-10%. And because the double-layer filter plate blocks the path of the direct transmission of the noise, the transmitted noise is the second-generation sub-wave sound and is not the direct transmission sound, and the double-layer filter plate has the function of reducing the noise.
The utility model discloses gaseous filtration of oil smoke, mainly be through surface filtration's mode, gas is in the motion process, because the inertia collision is on the filter surface, make the condensation of oil smoke gas and adhere to on the filter surface, block of double-deck filter is pulled and is made the air change direction secondary, therefore the filter effect far exceeds single-deck board-like filter screen, basically the same with double-deck relative dislocation filter screen, consequently, the oil smoke that gets into fan system will be less a lot than single-deck board-like filter screen, the maintenance-free time of fan system has been prolonged. The long-strip-shaped filter strip (namely the plate wall) can directly guide oil drops into an oil collecting area at the lower part of the filter screen, risks such as blockage do not exist between double-layer filter screens (air flow channels) staggered in the same direction, and the long-term normal use of the range hood can be ensured.
Therefore, adopt the utility model discloses the oil smoke filter equipment of technique will effectively promote the oil absorption cigarette performance to there is better filter effect, can effectively prolong the non-maintaining time of lampblack absorber fan system.
In addition, the above conclusions from the actual detection results are supported by the fluid mechanics theory:
there is a possibility that separation will occur due to the adverse pressure gradient of the outlet flange. The separation will cause the thickening of the boundary layer and affect the uniformity and stability of the flow, so that the flow field needs to be checked. For both solutions shown in fig. 1 and 2, in fact, the pressure gradient is similar to the effect generated by the broken plate port, and a large inverse pressure gradient exists.
For laminar flow, the resulting separation position can be roughly determined using the Stratford separation criterion of a two-dimensional or axisymmetric problem. The criterion is that
Cp sqrt(x·d Cp/dx)＜(10-6R x )1/10S
Separation will occur when the discriminant is not true. Wherein Cp =1-ue 2 /um 2
R x ＝umx/ v
In the formula: um-deceleration start point velocity, incoming flow velocity, ue-potential flow velocity on boundary layer boundary; s-constant, typically taken to be 0.35; v-kinematic viscosity coefficient of gas (m) 2 S); the distance between the x-separation point and the disturbance and the distance between the starting points of the dynamic boundary layer are taken at the last layer of damping net of the upstream stable section of the contraction section.
For turbulent incoming flow, the discriminant of the irridity of swirl generation by flow separation is
Although the determination of this approximation can also be calculated in detail using the naval stethokes equation, the equation and boundary conditions are as follows:
wherein Vx, vy and Vz are flow velocities in three directions of a flow field,
and the equal is the reynolds average stress respectively, and here, the expression of the special mathematical model is not listed continuously because of space relation.
The boundary conditions are no slip conditions at the solid interface, giving boundary conditions for flow rate and pressure at both the inlet and outlet.
However, in fact, such obvious difference does not need to do so many complicated calculations, and the scheme of the present invention is obviously lower than the two schemes shown in the attached fig. 1 and 2 in separation degree, so that the strength of the generated vortex is also lower, and not only is the smooth blockage condition generated by the vortex lighter, but also the wind pressure energy loss is small, and the noise is also significantly reduced.
Drawings
FIG. 1 is a sectional view of a single-layer perforated plate type filter device;
FIG. 2 is a sectional view of a part of a conventional double-deck inverted perforated plate type filtering apparatus;
FIG. 3 is a sectional view of the filter device according to the present invention;
fig. 4 is a schematic exploded view of a first embodiment of the present invention;
FIG. 5 is a schematic perspective exploded view of another embodiment of the present invention
Fig. 6 is a bottom view of the first embodiment of the present invention;
FIG. 7 is a cross-sectional view of a partial structure of a double-layer filter plate according to an embodiment of the present invention;
FIG. 8 is a sectional view of a partial structure of a double-layered filter plate according to an embodiment of the present invention;
fig. 9 is a sectional view of a partial structure of a triple-double-layer filter plate according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Example one
Fig. 3 to 7 show a preferred embodiment of the present invention. As shown in fig. 3 to 7, the soot filter device of the present embodiment has a rectangular funnel shape as a whole, and each side of the soot filter device has a double-layer structure formed by two flat filter plates 1, and thus the filter plates 1 are arranged obliquely with respect to the horizontal plane, that is, the walls 3 between the adjacent ventilation holes 2 of the filter plates 1 are arranged obliquely.
Open on the filter 1 and have rectangular form ventilation hole 2, the width and the interval of ventilation hole 2 on two-layer filter 1 equal, and the mutual staggered arrangement of ventilation hole 2 on two-layer filter 1. The periphery of the ventilation hole 1 is formed with a flange 31, and the direction of the flange 31 of the ventilation hole 2 on all the filter plates 1 faces the inside of the range hood.
The cross-sectional shape of the plate wall 3 between the adjacent ventilation holes 2 on the filter plate 1 is arc-shaped.
The width of the vent hole 2 is 7.4mm, and the height H of the flange 31 of the vent hole 2 is 3mm.
The gap M between the two filter plates 1 is 2.5mm.
In two-layer filter 1, the width of the stave 3 between the adjacent ventilation hole 2 on the upper filter 1 is 1mm bigger than the width of the ventilation hole 2 of the corresponding department on the lower filter 1.
Through actual detection, the air quantity is increased by 0.7m compared with that of a single-layer plate type filter screen 3 Min, extremely small wind resistance, and 6 percent of air loss, which is increased by 4m compared with the oil fume filtering device with two layers of inverted buckle type perforated filtering plates 3 And/min. The noise is greatly reduced by 0.5dB compared with the oil fume filtering device with two layers of inverted buckle type perforated filtering plates.
Example two
Fig. 8 is a schematic view, and fig. 4 to 6 are views showing another preferred embodiment of the present invention. As shown in fig. 8, the oil smoke filter of this embodiment is substantially the same as the oil smoke filter of the first embodiment except that the shape and the related size of the plate wall 3 between the adjacent ventilating holes 2 of the two filter plates 1 are different. The method specifically comprises the following steps: in the embodiment, the section of the plate wall 3 between the adjacent ventilation holes 2 on the filter plate 1 is a straight line segment, the two ends of the straight line segment extend to form arc-shaped flanges 31, the width of each ventilation hole 2 is 10mm, the height H of each flange 31 of each ventilation hole 2 is 5mm, and the gap M between two layers of filter plates 1 is 4mm; in the two-layer filter plate 1, the width of the plate wall 3 between the adjacent vent holes 2 on the upper layer filter plate 1 is 5mm larger than that of the vent holes 2 at the corresponding position on the lower layer filter plate 1.
Through actual detection, the air quantity is increased by 0.1m compared with that of a single-layer plate type filter screen 3 Min, extremely small wind resistance, and 10 percent of air loss, which is 3m more than that of the oil fume filtering device with two layers of inverted buckle type perforated filter plates 3 And/min. The noise is greatly reduced by 0.2dB compared with the oil fume filtering device with two layers of inverted buckle type perforated filtering plates.
EXAMPLE III
Fig. 9 is a schematic view, and fig. 4 to 6 are views showing another preferred embodiment of the present invention. As shown in fig. 8, the soot filter of this embodiment is substantially the same as the soot filter of the first embodiment except that the shape and the related size of the wall 3 between the adjacent ventilation holes 2 of the two filter plates 1 are different, and the widths and the intervals of the ventilation holes 2 of the two filter plates are different. The method specifically comprises the following steps: in the embodiment, the cross section of the plate wall 3 between the adjacent vent holes 2 on the filter plate 1 is a straight line segment, and arc-shaped flanges 31 extend from two ends of the straight line segment, the width of the vent hole 2 on the upper layer filter plate 1 is 1mm, the height H1 of the flange 31 of the vent hole 2 is 2mm, the width of the vent hole 2 on the lower layer filter plate 1 is 8mm, the height H2 of the flange 31 of the vent hole 2 is 4mm, and the gap M between the two layers of filter plates 1 is 5mm; in two-layer filter 1, the width of the stave 3 between the adjacent ventilation hole 2 on upper filter 1 is 3mm bigger than the width of the ventilation hole 2 of the corresponding department on lower filter 1.
Through actual detection, the air quantity is increased by 0.1m compared with that of a single-layer plate type filter screen 3 Min, extremely small wind resistance, and 10 percent of air loss, which is 3m more than that of the oil fume filtering device with two layers of inverted buckle type perforated filter plates 3 And/min. The noise is greatly reduced by 0.2dB compared with the oil fume filtering device with two layers of inverted buckle type perforated filtering plates.
Claims (11)
1. The utility model provides an oil smoke filter equipment, its includes two-layer at least filter, and it has the ventilation hole to open on the filter, and the mutual staggered arrangement of ventilation hole on the adjacent two-layer filter, its characterized in that the peripheral shaping in ventilation hole has the turn-ups, and all filters go up the turn-ups direction of ventilation hole and all towards range hood's inside.
2. The soot filtering device of claim 1, wherein said filter plate has two layers.
3. The soot filtering device of claim 1, wherein said filter plate is planar.
4. The smoke filtering device of claim 1, 2 or 3, wherein said ventilation holes are elongated.
5. The oil smoke filtering device of claim 4, wherein said panel walls between adjacent ventilation holes in said filter panel are arcuate in cross-sectional shape.
6. The oil smoke filtering device of claim 4, wherein said vent holes have a width of 2-20 mm.
7. The oil smoke filtering device of claim 4, wherein the height of the flange of the vent hole is 1-8 mm.
8. The oil smoke filtering device of claim 4, wherein the gap between two adjacent layers of said filter plates is 1-5 mm.
9. The oil smoke filter of claim 4, wherein said filter panels are disposed in an inclined arrangement with respect to a horizontal plane, thereby providing an inclined arrangement of panel walls between adjacent ventilation holes in said filter panels.
10. The oil smoke filtering device according to claim 4, wherein in two adjacent layers of said filter plates, the width of the plate wall between the adjacent vent holes on the upper layer filter plate is greater than or equal to the width of the vent holes on the corresponding lower layer filter plate by + 0-5 mm.
11. The soot filtering device of claim 9, wherein said ventilation holes of each of said filter plates are of equal width and spacing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201077858U CN201028672Y (en) | 2007-03-29 | 2007-03-29 | Oil smoke filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201077858U CN201028672Y (en) | 2007-03-29 | 2007-03-29 | Oil smoke filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201028672Y true CN201028672Y (en) | 2008-02-27 |
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ID=39132885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201077858U Expired - Fee Related CN201028672Y (en) | 2007-03-29 | 2007-03-29 | Oil smoke filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201028672Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261686A (en) * | 2010-05-25 | 2011-11-30 | 樱花卫厨（中国）股份有限公司 | Oil filter device for range hood |
| CN102423591A (en) * | 2011-08-25 | 2012-04-25 | 中冶南方工程技术有限公司 | Oil-gas separator |
| CN109925814A (en) * | 2019-03-29 | 2019-06-25 | 广东君竹环保科技有限公司 | A kind of netted dynamic physical interception oil smoke purification separation device |
-
2007
- 2007-03-29 CN CNU2007201077858U patent/CN201028672Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261686A (en) * | 2010-05-25 | 2011-11-30 | 樱花卫厨（中国）股份有限公司 | Oil filter device for range hood |
| CN102423591A (en) * | 2011-08-25 | 2012-04-25 | 中冶南方工程技术有限公司 | Oil-gas separator |
| CN102423591B (en) * | 2011-08-25 | 2013-10-30 | 中冶南方工程技术有限公司 | Oil-gas separator |
| CN109925814A (en) * | 2019-03-29 | 2019-06-25 | 广东君竹环保科技有限公司 | A kind of netted dynamic physical interception oil smoke purification separation device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080227 Termination date: 20130329 |