CN108916938A - A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole - Google Patents
A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole Download PDFInfo
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- CN108916938A CN108916938A CN201810772817.9A CN201810772817A CN108916938A CN 108916938 A CN108916938 A CN 108916938A CN 201810772817 A CN201810772817 A CN 201810772817A CN 108916938 A CN108916938 A CN 108916938A
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- Prior art keywords
- hole
- noise filtering
- noise
- panel
- frequency noise
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2035—Arrangement or mounting of filters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Ventilation (AREA)
Abstract
A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole is provided with smoke machine main body and can eliminate the noise filtering device of multi-frequency noise, and noise filtering device is assemblied in smoke machine main body；The noise filtering device is set as being distributed with multiple for eliminating the panel of the through-hole of multi-frequency noise；The shape of the through-hole is at least one of circle, ellipse, triangle, square, rectangle, pentagon, hexagon, diamond shape or irregular shape.The noise filtering device is able to maintain long-term good noise reduction effect, which, which has, is easy to arrange, and dust, the grease on surface etc. can remove cleaning.The noise filtering device has the advantages that low cost, reliability are high.The material of the noise filtering device is anticorrosive, chemical resistance and is hardly damaged.It can be effectively reduced narrow frequency noise and broadband noise, noise reduction wide frequency range can reduce the noise of multiple frequencies.
Description
Technical field
The present invention relates to kitchen ventilator field, in particular to the kitchen ventilator of a kind of multi-frequency noise filtering with through-hole.
Background technique
It is chronically in the environment of high noisy, the hearing of people is often damaged, and can also be made in the environment of having noise for a long time
At user emotion problem.As people's quality of the life improves, people are also lower and lower to the tolerance of noise.Therefore kitchen ventilator
Noise reduction is also got more and more attention.
Kitchen ventilator noise reduction in the prior art is mostly the reduction that noise is realized by active noise reduction and passive noise reduction mode.
Active noise reduction mode can only act on noise of the frequency within 1000Hz, can only be by passive for the noise greater than 1000Hz
Noise reduction technology processing.And the passive denoising device of the prior art can only be handled for the noise of single-frequency section, it cannot be right
The noise of multiband carries out noise reduction.Since the noisy frequency range that kitchen ventilator generates can be 100Hz~8000Hz, it is clear that existing
In technology good noise reduction effect can not be generated for kitchen ventilator for the passive denoising device of single-frequency section.
Therefore, in view of the shortcomings of the prior art, providing a kind of kitchen ventilator of multi-frequency noise filtering with through-hole to solve now
There is technical deficiency very necessary.
Summary of the invention
A kind of multi-frequency noise mistake with through-hole is provided it is an object of the invention to avoid the deficiencies in the prior art place
The kitchen ventilator of filter.The kitchen ventilator of the multi-frequency noise filtering with through-hole has the advantages that multi-frequency noise can be eliminated.
Above-mentioned purpose of the invention is realized by following technical measures：
A kind of kitchen ventilator of multi-frequency noise filtering with through-hole is provided, smoke machine main body is provided with and multi-frequency can be eliminated
The noise filtering device of noise, noise filtering device are assemblied in smoke machine main body.
The noise filtering device is set as being distributed with multiple for eliminating the panel of the through-hole of multi-frequency noise.
The shape of the through-hole be circle, ellipse, triangle, square, rectangle, pentagon, hexagon, diamond shape or
At least one of person's irregular shape.
Preferably, the aperture of above-mentioned through-hole is defined as d, and d≤30mm.
Preferably, the value of above-mentioned d is multiple.
Preferably, the minimum range between the edge of above-mentioned through-hole and the edge of adjacent through-holes is b, and b is any greater than 0
Value.
Preferably, the value of above-mentioned b is multiple.
The present invention is by adjusting the edge minimum range in the aperture of different through-holes, the edge of through-hole and adjacent through-holes, panel
Via regions distribution or noise filtering device reach multi-frequency noise noise reduction at a distance from smoke machine main body.
Preferably, the thickness of above-mentioned panel is less than 20mm.
Preferably, above-mentioned through-hole is rectilinear through-hole, and the side of corresponding through-hole and the width in panel section are parallel.
Preferably, above-mentioned through-hole is bevel edge through-hole, the bevel edge of corresponding through-hole and panel section it is wide at included angle A, and A≤
20°。
Preferably, there are gaps between above-mentioned panel and the immediate wall surface of smoke machine main body, are by the distance definition in gap
H1。
Preferably, above-mentioned noise filtering device is additionally provided with sound-absorbing part, and sound-absorbing part assembles smoke machine main body.
Preferably, the thickness of above-mentioned sound-absorbing part is defined as H2, and H2≤0.6H1。
Preferably, above-mentioned sound-absorbing part is fixed on the outer surface of panel；Or
The sound-absorbing part is fixed on the surface of panel Yu the nearest wall surface of smoke machine main body；Or
The sound-absorbing part is fixed between panel and the nearest wall surface gap of smoke machine main body.
Preferably, above-mentioned sound-absorbing part is fiber, PP cotton, polyester fiber, Carbon fibe or porous foam；Or
The sound-absorbing part is porous plate.
Preferably, above-mentioned panel is metal decking, plastic front board or alloy panel.
Preferably, above-mentioned panel is connected with reinforced structure.
Preferably, above-mentioned reinforced structure is convex closure, recessed packet or reinforcing rib.
Preferably, it is 100Hz~8000Hz that above-mentioned noise filtering device, which eliminates noisy frequency range,.
A kind of kitchen ventilator of multi-frequency noise filtering with through-hole of the invention is provided with smoke machine main body and can eliminate more
The noise filtering device of frequency noise, noise filtering device are assemblied in smoke machine main body；The noise filtering device is set as being distributed
Have multiple for eliminating the panel of the through-hole of multi-frequency noise；The shape of the through-hole is circle, ellipse, triangle, pros
At least one of shape, rectangle, pentagon, hexagon, diamond shape or irregular shape.Denoising device in the prior art,
Single target frequency noise reduction can only be directed to.A kind of kitchen ventilator of multi-frequency noise filtering with through-hole of the invention can pass through
Adjust the aperture of different through-holes, the edge of through-hole and adjacent through-holes edge minimum range, the via regions of panel distribution or
Noise filtering device reaches multi-frequency noise noise reduction at a distance from smoke machine main body.The noise filtering device is able to maintain long-term good
Noise reduction effect, which, which has, is easy to arrange, and dust, the grease on surface etc. can remove cleaning.The noise filtering
Device has the advantages that low cost, reliability are high.The material of the noise filtering device is anticorrosive, chemical resistance and is hardly damaged
The advantages of, while can be effectively reduced narrow frequency noise and broadband noise.
Detailed description of the invention
Using attached drawing, the present invention is further illustrated, but the content in attached drawing is not constituted to any limit of the invention
System.
Fig. 1 is a kind of range hood structure schematic diagram of multi-frequency noise filtering with through-hole of embodiment 1.
Fig. 2 is the panel construction schematic diagram in Fig. 1.
Fig. 3 is the rectilinear through-hole schematic cross-section of embodiment 2.
Fig. 4 is bevel edge through hole section schematic diagram.
Fig. 5 is a kind of perspective view of the kitchen ventilator of multi-frequency noise filtering with through-hole of embodiment 3.
Fig. 6 is the panel construction schematic diagram of embodiment 4.
Fig. 7 is the panel construction schematic diagram of embodiment 5.
Fig. 1 includes into Fig. 7：
Noise filtering device 1,
Panel 11, through-hole 111, reinforced structure 112,
Sound-absorbing part 12,
Smoke machine main body 2.
Specific embodiment
Technical solution of the present invention is described further with the following Examples.
Embodiment 1.
A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole is provided with smoke machine main body 2 and can as shown in Figs. 1-2
The noise filtering device 1 of multi-frequency noise is eliminated, noise filtering device 1 is assemblied in smoke machine main body 2.
Noise filtering device 1 is set as being distributed with multiple for eliminating the panel 11 of the through-hole 111 of multi-frequency noise.
The shape of through-hole 111 of the present invention be circle, ellipse, triangle, square, rectangle, pentagon, hexagon,
At least one of diamond shape or irregular shape.The present embodiment through-hole 111 it is conveniently of circular shape because circle in technique
It is relatively easy in production, and because of the interference of not no corner angle, noise reduction effect is optimal.
It should be noted that the shape of through-hole 111 may be ellipse, triangle, square, rectangle, pentagon, six
Side shape, diamond shape or irregular shape, or the combination of the shape of above-mentioned a variety of through-holes 111, specific embodiment with
Depending on actual conditions.
The aperture of through-hole 111 of the invention is defined as d, and d≤30mm.The edge of through-hole 111 and the side of adjacent through-holes 111
Edge minimum range is b, and b is the arbitrary value greater than 0.The value of the d and b of the present embodiment are all multiple.
The present invention is in the constant situation of aperture d, the value of the edge minimum range b at the edge and adjacent through-holes 111 of through-hole 111
The target noise frequency of smaller elimination is bigger.It is constant at the edge of through-hole 111 and the edge minimum range b of adjacent through-holes 111
In the case of, the smaller target noise frequency to be eliminated of the value of aperture d is with regard to smaller.
The present invention be by adjusting the apertures of different through-holes 111, the edge of through-hole 111 and adjacent through-holes 111 edge most
Small distance, 111 area distribution of through-hole of panel 11 or noise filtering device 1 reach multi-frequency at a distance from smoke machine main body 2 and make an uproar
The purpose of sound noise reduction.The thickness of panel 11 of the invention is less than 20mm, because of the blocked up cost that will increase production of thickness and oil smoke
The weight of machine.
Denoising device principle of the invention is such：Noise filtering device 1 can make an uproar in limited closed space
When sound source travels to noise filtering device 1, noise reduction is carried out.Sound wave is usually propagated with opposite direction touching noise filtering device 1,
So most incidence wave can be interfered with back wave.
Noise filtering device 1 is to carry out noise reduction using the principle of resonance, specific noise frequency and mesh has been arranged in space
The noise filtering device 1 of frequency is marked, covibration is formed.
When resonate occur when, the sound wave of oscillation can intensely pierce into out through-hole 111 back and forth in air, and the sound of noise can be
It is converted to friction loss during this, achievees the effect that eliminate target frequency noise.
A kind of kitchen ventilator of multi-frequency noise filtering with through-hole of the invention can be by adjusting the hole of different through-holes 111
The edge minimum range of the edge of diameter and through-hole 111 and adjacent through-holes 111, the distribution of the via regions of panel 11, noise filtering fill
It sets 1 and reaches multi-frequency noise noise reduction at a distance from smoke machine main body 2.The noise filtering device 1 is able to maintain long-term good noise reduction effect.
The noise filtering device 1 is easy to arrange, while the dust on 1 surface of noise filtering device, grease can be removed by removing.This is made an uproar
Sound filter device 1 has the advantages that low cost and reliability are high.The material of the noise filtering device 1 is anticorrosive and chemical resistance
The advantages of, it is hardly damaged.The noise filtering device 1 can be effectively reduced narrow frequency noise and broadband noise.
Embodiment 2.
A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole, as shown in figure 3, other characteristics are same as Example 1, no
It is with place：The through-hole 111 of the present embodiment is preferably rectilinear through-hole 111, the side of corresponding through-hole 111 and the width in 11 section of panel
In parallel, as shown in Figure 3.
It should be noted that through-hole 111 of the invention or bevel edge through-hole 111, the bevel edge and panel of corresponding through-hole 111
Wide at included angle A, and A≤20 ° in 11 sections, as shown in Figure 4.It may be combinations of the above, specific embodiment is with reality
Depending on situation.
Noise filtering can be improved in the diversity choice of the shape of the distribution mode and through-hole 111 of the through-hole 111 of the present embodiment
The flexibility ratio that device 1 designs.
Embodiment 3.
A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole, as shown in figure 5, other features are same as Example 1, no
It is with place, it is H by the distance definition in gap that there are gaps between panel 11 and the immediate wall surface of smoke machine main body 21.It makes an uproar
Sound filter device 1 is additionally provided with sound-absorbing part 12, and sound-absorbing part assembles smoke machine main body 2.The thickness of sound-absorbing part 12 is defined as H2, and H2≤
0.6H1.The sound-absorbing part 12 of the present embodiment is fixed on the outer surface of panel 11.
Denoising device principle of the invention is such：In limited closed space, noise filtering is traveled in noise source
When device 1, noise reduction is carried out.Sound wave is usually propagated with opposite direction touching water conservancy diversion noise filtering device 1, thus it is most enter
Ejected wave can be interfered with back wave.In specific distance, about a quarter of noise source wavelength away from i.e. H at degree1, particle
Speed reaches highest.
It should be noted that sound-absorbing part 12 of the invention can be fixed on panel 11 and the nearest wall surface of smoke machine main body 2 surface or
Person's sound-absorbing part 12 is fixed between panel 11 and the nearest wall surface gap of smoke machine main body 2, and specific embodiment is according to practical feelings
Depending on condition.
The density and material of sound-absorbing part 12 also have an important influence, sound wave can directly through the sound-absorbing part of extremely-low density,
The frictional wear of sound energy can not be increased.Under high density, noise sound wave then can be reflected away directly, can not enter noise mistake
Filter the through-hole 111 of device 1.
Therefore sound-absorbing part 12 of the invention is preferably fiber, PP cotton, polyester fiber, Carbon fibe or porous foam.Or
Sound-absorbing part 12 is porous plate.
The present embodiment increases sound-absorbing part 12 compared with Example 1, and the setting of sound-absorbing part 12 can increase the consume of friction, increases
Strong noise reduction effect.
Embodiment 4.
A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole, as shown in fig. 6, other features are same as Example 1, no
It is with place, the panel 11 of the present embodiment is specially metal decking 11.Noise filtering device 1 eliminates noisy frequency range
100Hz~8000Hz.
It should be noted that panel 11 of the invention or plastic front board 11 or alloy panel 11, specific embodiment party
Depending on formula is with actual conditions.
The panel 11 of the present embodiment is connected with reinforced structure 112.Specific reinforced structure 112 is reinforcing rib.
It should be noted that reinforced structure 112 of the invention or convex closure or recessed packet, or a variety of any groups
It closes, depending on specific embodiment is with actual conditions.
Compared with Example 1, the more rigid of panel 11 is low resistance structure to the present embodiment.Low resistance structure can make into
Ejected wave and back wave have out of phase under the specific distance with reflecting surface, so that the sound wave of noise can cancel out each other, from
And reduce the intensity of noise.The panel 11 of the metal of the present embodiment has the advantages that high temperature resistant, durable.
Embodiment 5.
A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole, as shown in fig. 7, other features are same as Example 1, no
It is with place, the shape of the through-hole 111 of the present embodiment is the combination of ellipse, triangle, square and irregular shape.
Compared with Example 1, the shape of the through-hole 111 of the present embodiment is more diversified for the present embodiment, can improve through-hole 111
In the flexibility that panel 11 is distributed, the more sharp elimination for carrying out multi-frequency noise.
Embodiment 6.
A kind of design of the kitchen ventilator of the multi-frequency noise filtering with through-hole：
Target frequency 1：7000Hz.
The aperture d=10mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=2.6mm.
Target frequency 2：800Hz.
The aperture d=5mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=20mm.
Therefore the noise filtering device 1 of the kitchen ventilator is only in the spy with the corresponding through-hole 111 of above-mentioned two target frequency
Property can effectively eliminate the noise of corresponding frequency.
It should be noted that the present embodiment only lists the design parameter of two target frequencies, table can not only for the present invention
For the noise of two kinds of frequencies, only corresponding different parameter, the present invention can eliminate the noise of multi-frequency, reach wideband frequency drop
It makes an uproar purpose.
Embodiment 7.
A kind of design of the kitchen ventilator of the multi-frequency noise filtering with through-hole：
Target frequency 1：8000Hz.
The aperture d=10mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=2.5mm.
Target frequency 2：100Hz.
The aperture d=2mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=50mm.
Therefore the noise filtering device 1 of the kitchen ventilator is only in the spy with the corresponding through-hole 111 of above-mentioned two target frequency
Property can effectively eliminate the noise of corresponding frequency.
It should be noted that the present embodiment only lists the design parameter of two target frequencies, table can not only for the present invention
For the noise of two kinds of frequencies, only corresponding different parameter, the present invention can eliminate the noise of multi-frequency, reach wideband frequency drop
It makes an uproar purpose.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should be managed
Solution, can be with modifying or equivalently replacing the technical solution of the present invention, without departing from the essence and model of technical solution of the present invention
It encloses.
Claims (10)
1. a kind of kitchen ventilator of the multi-frequency noise filtering with through-hole, it is characterised in that：It is provided with smoke machine main body and can eliminate
The noise filtering device of multi-frequency noise, noise filtering device are assemblied in smoke machine main body；
The noise filtering device is set as being distributed with multiple for eliminating the panel of the through-hole of multi-frequency noise；
The shape of the through-hole is circle, ellipse, triangle, square, rectangle, pentagon, hexagon, diamond shape or not
At least one of regular shape.
2. the kitchen ventilator of the multi-frequency noise filtering according to claim 1 with through-hole, it is characterised in that：The through-hole
Aperture is defined as d, and d≤30mm；
The value of the d is multiple.
3. the kitchen ventilator of the multi-frequency noise filtering according to claim 2 with through-hole, it is characterised in that：The through-hole
Minimum range between edge and the edge of adjacent through-holes is b, and b is the arbitrary value greater than 0；
The value of the b is multiple.
4. the kitchen ventilator of the multi-frequency noise filtering according to claim 3 with through-hole, it is characterised in that：By adjusting not
With the edge minimum range in the aperture of through-hole, the edge of through-hole and adjacent through-holes, the distribution of the via regions of panel or noise mistake
Filter device reaches multi-frequency noise noise reduction at a distance from smoke machine main body；
The thickness of the panel is less than 20mm.
5. the kitchen ventilator of the multi-frequency noise filtering according to claim 4 with through-hole, it is characterised in that：The through-hole is
Rectilinear through-hole, the side of corresponding through-hole and the width in panel section are parallel.
6. the kitchen ventilator of the multi-frequency noise filtering according to claim 4 with through-hole, it is characterised in that：The through-hole is
Wide at included angle A, and A≤20 ° in bevel edge through-hole, the bevel edge of corresponding through-hole and panel section.
7. the kitchen ventilator of the multi-frequency noise filtering according to claim 5 or 6 with through-hole, it is characterised in that：The face
There are gaps between plate and the immediate wall surface of smoke machine main body, are H by the distance definition in gap1；
The noise filtering device is additionally provided with sound-absorbing part, and sound-absorbing part assembles smoke machine main body；
The thickness of the sound-absorbing part is defined as H2, and H2≤0.6H1。
8. the kitchen ventilator of the multi-frequency noise filtering according to claim 7 with through-hole, it is characterised in that：The sound-absorbing part
It is fixed on the outer surface of panel；Or
The sound-absorbing part is fixed on the surface of panel Yu the nearest wall surface of smoke machine main body；Or
The sound-absorbing part is fixed between panel and the nearest wall surface gap of smoke machine main body.
9. the kitchen ventilator of the multi-frequency noise filtering according to claim 8 with through-hole, it is characterised in that：The sound-absorbing part
For fiber, PP cotton, polyester fiber, Carbon fibe or porous foam；Or
The sound-absorbing part is porous plate.
10. the kitchen ventilator of the multi-frequency noise filtering according to claim 9 with through-hole, it is characterised in that：The panel
For metal decking, plastic front board or alloy panel；
The panel is connected with reinforced structure；
The reinforced structure is convex closure, recessed packet or reinforcing rib；
It is 100Hz~8000Hz that the noise filtering device, which eliminates noisy frequency range,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810772817.9A CN108916938A (en) | 2018-07-14 | 2018-07-14 | A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810772817.9A CN108916938A (en) | 2018-07-14 | 2018-07-14 | A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole |
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| Publication Number | Publication Date |
|---|---|
| CN108916938A true CN108916938A (en) | 2018-11-30 |
Family
ID=64415127
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810772817.9A Pending CN108916938A (en) | 2018-07-14 | 2018-07-14 | A kind of kitchen ventilator of the multi-frequency noise filtering with through-hole |
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|---|---|---|---|---|
| EP0596846A1 (en) * | 1992-11-03 | 1994-05-11 | Aktiebolaget Electrolux | Kitchen ventilator |
| CN2656683Y (en) * | 2003-11-06 | 2004-11-17 | 宁波方太厨具有限公司 | Noise reducing casing for kitchen ventilator |
| CN1917036A (en) * | 2006-09-12 | 2007-02-21 | 浙江大学 | Perforation plate for improving sound absorptivity |
| CN101149296A (en) * | 2007-11-09 | 2008-03-26 | 北京航空航天大学 | Broad-band noise-reducing acoustic liner and its manufacture method |
| CN203809356U (en) * | 2014-03-31 | 2014-09-03 | 美的集团武汉制冷设备有限公司 | Volute for air-conditioner indoor unit and air-conditioner indoor unit |
| CN105509119A (en) * | 2016-02-18 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Noise reduction device and extractor hood |
| CN106871204A (en) * | 2017-03-31 | 2017-06-20 | 广东美的厨房电器制造有限公司 | Range hood |
-
2018
- 2018-07-14 CN CN201810772817.9A patent/CN108916938A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0596846A1 (en) * | 1992-11-03 | 1994-05-11 | Aktiebolaget Electrolux | Kitchen ventilator |
| CN2656683Y (en) * | 2003-11-06 | 2004-11-17 | 宁波方太厨具有限公司 | Noise reducing casing for kitchen ventilator |
| CN1917036A (en) * | 2006-09-12 | 2007-02-21 | 浙江大学 | Perforation plate for improving sound absorptivity |
| CN101149296A (en) * | 2007-11-09 | 2008-03-26 | 北京航空航天大学 | Broad-band noise-reducing acoustic liner and its manufacture method |
| CN203809356U (en) * | 2014-03-31 | 2014-09-03 | 美的集团武汉制冷设备有限公司 | Volute for air-conditioner indoor unit and air-conditioner indoor unit |
| CN105509119A (en) * | 2016-02-18 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Noise reduction device and extractor hood |
| CN106871204A (en) * | 2017-03-31 | 2017-06-20 | 广东美的厨房电器制造有限公司 | Range hood |
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Application publication date: 20181130 |