CN107023862B - A kind of top-sucking kitchen ventilator - Google Patents
A kind of top-sucking kitchen ventilator Download PDFInfo
- Publication number
- CN107023862B CN107023862B CN201610071510.7A CN201610071510A CN107023862B CN 107023862 B CN107023862 B CN 107023862B CN 201610071510 A CN201610071510 A CN 201610071510A CN 107023862 B CN107023862 B CN 107023862B
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- Prior art keywords
- blower
- air inlet
- trochal disc
- rectifying cavity
- kitchen ventilator
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A kind of top-sucking kitchen ventilator, it include blower hood, blower is installed in blower hood, it is characterized by: being divided into assembling chamber and rectifying cavity inside blower hood, rectifying cavity is located at the lower section of the assembling chamber, blower uses three-dimensional flow impeller, and assembling is intracavitary in assembling, and the air inlet mouth down of blower is simultaneously connected with the rectifying cavity.The present invention has the advantages that being separated into assembling chamber and the rectifying cavity below assembling chamber inside the blower hood of the top-sucking kitchen ventilator, the intracavitary blower of assembling is mounted on using three-dimensional flow impeller, and the air inlet mouth down of blower and it is connected with rectifying cavity, the structure and space layout of entire range hood are more novel, and blower is using after three-dimensional flow impeller, blower fan structure is more compact, size is relatively small, fan efficiency and wind pressure are high, the suction gradient of generation is big, it can effectively prevent fumes escaping, the clean absorption rate of range hood can be substantially improved.
Description
Technical field
The present invention relates to a kind of range hoods, more particularly, to a kind of top-sucking kitchen ventilator.
Background technique
Blower is the important component of range hood, and the impeller of blower plays the role of energy conversion, impeller performance
Quality directly affects the performance of range hood.Blower fan system homogeneity with industry development, as range hood core component
Change is on the rise, and conventional fan performance boost space is limited.Currently, traditional draught fan impeller used for range hood is generally plate
It is fastened and connected after stamping by both ends, blade can only generally be made into the arc-shaped of uniform thickness, since wheel speed is universal
More than 800RPM, thus between blade, actual fluid separation and reflux are more obvious.In addition, for the range hood of top suction type
For, the air inlet of blower is typically toward front, and the air outlet of blower is arranged upward, i.e. the air inlet of blower and blower outlet air
It is mouthful mutually in 90 °, when blower works, since impeller carries out 90 ° in flowing into impeller and turns to prewhirl effect and gas of gas
To direction can be altered in steps in the process, simple self-consistent inlet and outlet angle is unfavorable for the practical acting ability of impeller
's.In order to improve fan efficiency, although people have also carried out many improvement on blade construction, these improvement are also limited to
The efficiency raising of binary flow technique, blower is relatively limited, can not fundamentally overcome defect present in two-dimensional impeller, accordingly
Ground, existing range hood is relatively low in the prevalence of static pressure, effective wind rate is less than normal, poor anti jamming capability and fumes escaping are asked
Topic.In conclusion needing to be further improved existing top-sucking kitchen ventilator structure.
Summary of the invention
The technical problem to be solved by the present invention is to be directed to above-mentioned state of the art, a kind of structure novel is provided, can be big
The top-sucking kitchen ventilator of width promotion static pressure and effective wind rate.
The technical scheme of the invention to solve the technical problem is: the top-sucking kitchen ventilator, includes blower
Outer cover is equipped with blower in the blower hood, it is characterised in that: is divided into assembling inside the blower hood
Chamber and rectifying cavity, the rectifying cavity are located at the lower section of the assembling chamber, and the blower uses three-dimensional flow impeller, the blower
It is mounted on that assembling is intracavitary, the air inlet mouth down of blower is simultaneously connected with the rectifying cavity.
In order to improve rectification effect, it is preferable that the rectifying cavity is in the structure that upper end is small, lower end is big, the blower
Air inlet is set to the central part at the top of rectifying cavity.
Further preferably, the trapezium structure that bottom is short, bottom is long is presented in the longitudinal cross-section of the rectifying cavity, the rectifying cavity
Value relationship between height h1 and the diameter D of air inlet is D≤h1≤3D.
In order to improve the rectification effect of rectifying cavity, horizontally disposed screens are installed in the rectifying cavity, it is described
Value relationship between the diameter D of the vertical range h2 and air inlet of screens and air inlet is h2 < D.
In order to reduce the operating noise of range hood, it is provided with bloop in the cavity wall of the rectifying cavity, in the rectification
Acoustical cotton is filled between the outer wall of chamber and the inner wall of the blower hood.
Further preferably, the three-dimensional flow impeller includes rear trochal disc and blade, and the bottom of the blade is mounted on rear-wheel
It is arranged successively in the disk of disk and along the circumferencial direction of rear trochal disc, the outer side edges of the blade are air outlet side, the outside
While the angle α between the projection on rear trochal disc outer circumference surface and rear trochal disc excircle normal is 60 °≤α≤60 ° ﹣, the leaf
The inner side edge of piece be air inlet side, the inner side edge projected on rear trochal disc outer circumference surface between rear trochal disc excircle normal
Angle β be 20 °≤β≤70 °, line between the outer side edges bottom end and the rear trochal disc center of circle and the inner side edge bottom end with after
It is 10 °≤θ≤65 ° that line between the wheel disc center of circle, which is formed by angle theta, and the outer side edges vertex is relative to the vertical of rear trochal disc
Height h3 is 0.2≤h3/h4≤0.8 relative to the value relationship of the vertical height h4 of rear trochal disc with the inner side edge vertex.Three
After adopting the above structure, the aeroperformance of blower is more preferable for flow filament impeller, and fan efficiency and wind pressure are higher, and the suction gradient of generation is more
Greatly.
Further preferably, which further includes having the front cover for being mounted on vane tip, in the front cover and impeller
Where shaft meridian plane intersection part be formed with from-inner-to-outer successively the first arc section of rounding off, the second arc section and
Straightway, value relationship between the radius R1 of first arc section and the radius R2 of the second arc section be 0.1≤R1/R2≤
0.6, the value relationship between the length L of the straightway and the radius R2 of the second arc section is 0.1≤L/R2≤0.4.In this way,
The three-dimensional flow impeller is double shrouded wheel, and blade is mounted between rear trochal disc and front cover.
Blower can have a variety of structures, it is preferable that the blower include the three-dimensional flow impeller, spiral case, motor, into
Air port circle and outlet housing, the three-dimensional flow impeller be mounted on inside spiral case, the output shaft of the motor downwards, the ternary
The rear trochal disc of stream impeller is mounted on the output shaft of the motor, and the air inlet mouth circle is mounted on the air inlet of blower and with three
The front cover match of flow filament impeller is installed, and the air outlet of the blower upward and is biased in the side of the assembling chamber, described
Outlet housing be mounted on the air outlet.
In order to further increase fan efficiency, the spacing δ between the rear trochal disc and the spiral case wall of the neighbouring rear trochal disc is
1mm≤δ≤10mm, the front cover be set in air inlet mouth circle outside, and front cover front side edge along between the air inlet mouth circle lateral wall
Vertical range Δ be 0.5mm≤Δ≤5mm.
In order to reduce the operating noise of range hood, the air outlet edge of the outlet housing is in lobe type, or in outlet air
Through-hole is provided in the air outlet annular wall of cover and makes air outlet annular wall in mesh-structured.
Compared with the prior art, the advantages of the present invention are as follows: it is separated into inside the blower hood of the top-sucking kitchen ventilator
Assembling chamber and the rectifying cavity below assembling chamber are mounted on the intracavitary blower of assembling using three-dimensional flow leaf
Wheel, and the air inlet mouth down of blower and be connected with rectifying cavity, the structure and space layout of entire range hood are more novel, and
And blower, using after three-dimensional flow impeller, blower fan structure is more compact, and size is relatively small, fan efficiency and wind pressure are high, generation
Suction gradient is big, can effectively prevent fumes escaping, and the clean absorption rate of range hood can be substantially improved.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the cross-sectional view of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the draught fan impeller of the embodiment of the present invention；
Fig. 4 is the side view of draught fan impeller shown in Fig. 3；
Fig. 5 is the structural schematic diagram of blade air outlet side hypsokinesis of the invention；
Fig. 6 is the structural schematic diagram that blade air outlet side of the invention is leaned forward；
Fig. 7 is the perspective view of blade air inlet side of the invention on impeller meridian plane；
Fig. 8 is the cross-sectional view of draught fan impeller shown in Fig. 3；
Fig. 9 is the cross-sectional view of draught fan impeller shown in Fig. 3；
Figure 10 is perspective view of the blade of the embodiment of the present invention on impeller meridian plane；
Figure 11 is the blower fan structure schematic diagram of the embodiment of the present invention；
Figure 12 is the perspective exploded view of blower shown in Figure 11；
Figure 13 is the cross-sectional view of blower shown in Figure 11.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
As depicted in figs. 1 and 2, the top-sucking kitchen ventilator in the present embodiment include blower hood 1, blower 2, exhaust fume collecting hood 8,
The inside of the main components such as cowling panel 9, blower hood 1 is separated into assembling chamber 4 and rectifying cavity 5 by lateral partitions 3, rectifies
Chamber 5 is located at the lower section of assembling chamber 4, and blower 2 is mounted in assembling chamber 4, the air inlet mouth down of blower 2 and and rectifying cavity
5 are connected, and the air inlet of blower 2 is set to the central part at 5 top of rectifying cavity, such as can be with middle or the position being substantially centered
It sets, upward, the structure of exhaust fume collecting hood 8 and cowling panel 9 is existing conventional structure to the air outlet of blower 2, is not unfolded to describe herein.
In the present embodiment, the trapezium structure that bottom is short, bottom is long, the height h1 of rectifying cavity 5 are presented in the longitudinal cross-section of rectifying cavity 5
Value relationship between the diameter D of 2 air inlet of blower is D≤h1≤3D.In addition, in order to further increase the rectification of rectifying cavity
Effect is equipped with horizontally disposed screens 6 in rectifying cavity 5, filter hole 61, the percent opening of screens is provided on screens 6
Value for > 30%, also, between the diameter D of the vertical range h2 and air inlet of screens 6 and air inlet is closed
System is h2 < D.In order to which noise when blower work is effectively reduced, bloop 51, percent opening > are provided in the cavity wall of rectifying cavity 5
5%, also, acoustical cotton 7 is filled between the outer wall of rectifying cavity 5 and the inner wall of blower hood 1.
As shown in Figures 3 to 10, what the blower 2 in the present embodiment used makes three-dimensional flow impeller 20, the three-dimensional flow impeller 20
For double shrouded wheel comprising there are rear trochal disc 21, blade 22 and front cover 23, blade 22 is mounted between rear trochal disc 21 and front cover 23,
Blade 22 has 10~50, and specifically, 22 bottom of blade is mounted in the disk of rear trochal disc 21 and along the circumference side of rear trochal disc
To being arranged successively, the outer side edges 221 of blade 22 are air outlet side, and projection of the outer side edges 221 on rear trochal disc outer circumference surface with
Angle α between 21 excircle normal of rear trochal disc is 60 °≤α≤60 ° ﹣, and the inner side edge 222 of blade is air inlet side, and inside
The angle β between 21 excircle normal of rear trochal disc that side 222 projects on rear trochal disc outer circumference surface is 20 °≤β≤70 °, and
Line between 21 center of circle of line between 21 center of circle of 221 bottom end of outer side edges and rear trochal disc and 222 bottom end of inner side edge and rear trochal disc
Formed angle theta is 10 °≤θ≤65 °, and 221 vertex of outer side edges is pushed up relative to the vertical height h3 and inner side edge 222 of rear trochal disc 21
Point is 0.2≤h3/h4≤0.8 relative to the value relationship of the vertical height h4 of rear trochal disc 21.In addition, in the present embodiment, blade
22 outer side edges 221 are distributed on the outer peripheral surface of same cylinder, and the inner side edge 222 of blade 22 is oblique tilted from top to bottom, leaf
The bottom edge 223 of piece 22 is in the same plane, and the top margin 224 of blade 22 is in rounding off structure.
Front cover 23 is mounted on the top of blade, is formed in the part that front cover 23 intersects with the meridian plane where impeller shaft
From-inner-to-outer successively the first arc section 231 of rounding off, the second arc section 232 and straightway 233, the first arc section 231
Value relationship between radius R1 and the radius R2 of the second arc section 232 is 0.1≤R1/R2≤0.6, the length L of straightway 233
Value relationship between the radius R2 of the second arc section 232 is 0.1≤L/R2≤0.4.
Three-dimensional flow is defined from the dimension of design, and three-dimensional flow refers to that in actually flowing, all flow parameters are all
Three direction variable functions (x, y, z) of space coordinates.Due to the practical flowing of gas be it is irregular, two-dimensional current (x,
Y) it cannot really reflect the practical flow trace of gas, and Three -dimension flow then can really reflect.
After three-dimensional flow impeller using the above structure, blade aerodynamic shape is more reasonable, and flowing accelerating region is longer, stabilization area phase
To longer, the number of blade is few, it is possible to reduce the loss such as import impact, the outlet tail separation of flow, gas separation, closer to the true of gas
Flow regime, therefore efficiency is obviously improved, static pressure is more preferable, and three-dimensional flow impeller has a characteristic of compressed air, when work, in wind
Machine air inlet forms the negative pressuren zone of one big gradient to promote anti-interference ability, to effectively prevent fumes escaping.It is tested, it should
Top-sucking kitchen ventilator is preferable in the pressure distribution uniformity of fan inlet, and pitot loss is smaller.
As shown in Figure 11 to Figure 13, blower 2 used by the range hood of the present embodiment includes three-dimensional flow impeller 20, snail
Shell 24, motor 25, air inlet mouth circle 26 and outlet housing 27, three-dimensional flow impeller 20 are mounted on inside spiral case 24, the output shaft of motor 25
Downwards, the rear trochal disc 21 of three-dimensional flow impeller 20 is mounted on the output shaft of motor 25 and is locked with nut 28, enters the wind mouth circle
26 are mounted on the air inlet of blower 2 and are coupled with the front cover of three-dimensional flow impeller 20 23, and the air outlet of blower 2 upward and biases
In the side of assembling chamber 4, outlet housing 27 is mounted on air outlet, and is provided with through-hole in 27 air outlet annular wall of outlet housing
271 and make air outlet annular wall in mesh-structured, to reduce the noise of air outlet for kitchen ventilator.In addition, in order to have blower
There is higher efficiency, the spacing δ between rear trochal disc 21 and the spiral case wall 241 of the neighbouring rear trochal disc is 1mm≤δ≤10mm, front cover
23 are set in outside air inlet mouth circle 26, and the front side edge of front cover 23 is along the vertical range Δ between air inlet 26 lateral wall of mouth circle
0.5mm≤Δ≤5mm。
The foregoing is merely the preferred embodiment of the present invention, it is noted that for those of ordinary skills,
Under the premise of not departing from the principle of the present invention, a variety of remodeling or improvement can be carried out to the present invention, for example blower can also use
Unshrouded impeller saves the front cover in the double shrouded wheel of the present embodiment, can also for another example set the air outlet edge of outlet housing
Lobe type is counted into, these are regarded as within protection scope of the present invention.
Claims (9)
1. a kind of top-sucking kitchen ventilator includes blower hood (1), blower (2) are installed in the blower hood (1),
It is divided into assembling chamber (4) and rectifying cavity (5) inside the blower hood (1), the rectifying cavity (5) is located at the wind
The lower section of machine installation cavity (4), the blower (2) use three-dimensional flow impeller (20), and the blower (2) is mounted on assembling chamber
(4) in, the air inlet mouth down of blower (2) is simultaneously connected with the rectifying cavity (5), it is characterised in that: the three-dimensional flow leaf
Wheel (20) includes rear trochal disc (21) and blade (22), and the bottom of the blade (22) is mounted in the disk of rear trochal disc (21) and edge
The circumferencial direction of rear trochal disc be arranged successively, the outer side edges (221) of the blade (22) are air outlet side, the outer side edges
(221) angle α between the projection on rear trochal disc outer circumference surface and rear trochal disc (21) excircle normal is 60 °≤α≤60 ° ﹣,
The inner side edge (222) of the blade is air inlet side, the inner side edge (222) projects on rear trochal disc outer circumference surface and rear-wheel
Angle β between disk (21) excircle normal is 20 °≤β≤70 °, outer side edges (221) bottom end and rear trochal disc (21) center of circle
Between line and the inner side edge (222) bottom end and rear trochal disc (21) center of circle between line be formed by angle theta be 10 °≤
θ≤65 °, vertical height h3 and the inner side edge (222) vertex phase of outer side edges (221) vertex relative to rear trochal disc (21)
Value relationship for the vertical height h4 of rear trochal disc (21) is 0.2≤h3/h4≤0.8.
2. top-sucking kitchen ventilator according to claim 1, it is characterised in that: the rectifying cavity (5) in upper end it is small, under
Big structure is held, the air inlet of the blower (2) is set to the central part at the top of rectifying cavity (5).
3. top-sucking kitchen ventilator according to claim 1, it is characterised in that: the longitudinal cross-section of the rectifying cavity (5) is in
The trapezium structure that upper bottom is short, bottom is long, the value between the height h1 of the rectifying cavity (5) and the diameter D of blower (2) air inlet
Relationship is D≤h1≤3D.
4. top-sucking kitchen ventilator according to claim 1, it is characterised in that: be equipped in the rectifying cavity (5)
Horizontally disposed screens (6), the screens (6) and the vertical range h2 of the air inlet and diameter D of air inlet
Between value relationship be h2 < D.
5. top-sucking kitchen ventilator according to claim 1, it is characterised in that: opened in the cavity wall of the rectifying cavity (5)
There are bloop (51), is filled with acoustical cotton (7) between the outer wall of the rectifying cavity (5) and the inner wall of the blower hood (1).
6. top-sucking kitchen ventilator according to claim 1, it is characterised in that: further include being mounted at the top of blade (22)
Front cover (23), be formed with from-inner-to-outer in the part that the front cover (23) intersects with the meridian plane where impeller shaft and successively justify
Slip over the first arc section (231), the second arc section (232) and straightway (233) crossed, the half of first arc section (231)
Value relationship between diameter R1 and the radius R2 of the second arc section (232) is 0.1≤R1/R2≤0.6, the straightway (233)
Length L and the second arc section (232) radius R2 between value relationship be 0.1≤L/R2≤0.4.
7. top-sucking kitchen ventilator according to claim 6, it is characterised in that: the blower (2) includes described three
Flow filament impeller (20), spiral case (24), motor (25), air inlet mouth circle (26) and outlet housing (27), three-dimensional flow impeller (20) peace
It is internal mounted in spiral case (24), the output shaft of the motor (25) downwards, the rear trochal disc (21) of the three-dimensional flow impeller (20)
It is mounted on the output shaft of the motor (25), the air inlet mouth circle (26) is mounted on the air inlet of blower (2) and and ternary
The front cover (23) of stream impeller (20) is coupled, and the air outlet of the blower (2) upward and is biased in the assembling chamber (4)
Side, the outlet housing (27) is mounted on the air outlet.
8. top-sucking kitchen ventilator according to claim 7, it is characterised in that: the rear trochal disc (21) and the neighbouring rear-wheel
Spacing δ between the spiral case wall (241) of disk is 1mm≤δ≤10mm, and the front cover (23) is set in air inlet mouth circle (26) outside, and
The front side edge of front cover (23) is 0.5mm≤Δ≤5mm along the vertical range Δ between described air inlet mouth circle (26) lateral wall.
9. top-sucking kitchen ventilator according to claim 7, it is characterised in that: the air outlet edge of the outlet housing (27)
In lobe type, or through-hole (271) is provided in the air outlet annular wall of outlet housing (27) and makes air outlet annular wall in mesh
Structure.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610071510.7A CN107023862B (en) | 2016-02-01 | 2016-02-01 | A kind of top-sucking kitchen ventilator |
| PCT/CN2017/000134 WO2017133371A1 (en) | 2016-02-01 | 2017-01-24 | Ceiling-mounted exhaust hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610071510.7A CN107023862B (en) | 2016-02-01 | 2016-02-01 | A kind of top-sucking kitchen ventilator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107023862A CN107023862A (en) | 2017-08-08 |
| CN107023862B true CN107023862B (en) | 2019-11-12 |
Family
ID=59499376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610071510.7A Active CN107023862B (en) | 2016-02-01 | 2016-02-01 | A kind of top-sucking kitchen ventilator |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107023862B (en) |
| WO (1) | WO2017133371A1 (en) |
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| CN109595633B (en) * | 2017-09-30 | 2024-01-16 | 宁波方太厨具有限公司 | Fume exhauster |
| CN109780597B (en) * | 2017-11-10 | 2024-01-16 | 宁波方太厨具有限公司 | Fume exhauster |
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| CN109990340B (en) * | 2017-12-30 | 2023-11-17 | 宁波方太厨具有限公司 | High-performance range hood |
| CN108019806A (en) * | 2018-01-11 | 2018-05-11 | 广东美的厨房电器制造有限公司 | Range hood |
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| CN108344017A (en) * | 2018-05-14 | 2018-07-31 | 杭州老板电器股份有限公司 | side-suction type range hood |
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| CN110145495A (en) * | 2019-06-11 | 2019-08-20 | 佛山市晟昊通风机有限公司 | A kind of structure of efficient centrifugal air inlet |
| CN111536564B (en) * | 2020-05-12 | 2021-11-26 | 宁波方太厨具有限公司 | Fume exhaust fan |
| CN111780169A (en) * | 2020-07-28 | 2020-10-16 | 嵊州市浙江工业大学创新研究院 | Integrated kitchen oil smoke cleaning system |
| CN112344403B (en) * | 2020-10-13 | 2024-09-17 | 宁波方太厨具有限公司 | Range hood and control method thereof |
| CN112781085B (en) * | 2021-01-21 | 2024-08-16 | 宁波方太厨具有限公司 | Noise reduction device for range hood and range hood using same |
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2017
- 2017-01-24 WO PCT/CN2017/000134 patent/WO2017133371A1/en active Application Filing
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| CN2357241Y (en) * | 1999-01-06 | 2000-01-05 | 陈云 | Fume extractor with silencer |
| CN201476129U (en) * | 2009-06-26 | 2010-05-19 | 佛山市樱顺卫厨用品有限公司 | Energy-saving highly-effective smoke exhaust ventilator |
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| CN104454634A (en) * | 2013-09-13 | 2015-03-25 | 博西华电器（江苏）有限公司 | Range hood and fan system thereof |
| CN105275875A (en) * | 2015-10-15 | 2016-01-27 | 珠海格力电器股份有限公司 | Centrifugal fan blade and centrifugal fan |
| CN205560901U (en) * | 2016-02-01 | 2016-09-07 | 宁波方太厨具有限公司 | Ceiling type range hood |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107023862A (en) | 2017-08-08 |
| WO2017133371A1 (en) | 2017-08-10 |
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