CN109827213A - A kind of noise reducing type range hood - Google Patents
A kind of noise reducing type range hood Download PDFInfo
- Publication number
- CN109827213A CN109827213A CN201910125333.XA CN201910125333A CN109827213A CN 109827213 A CN109827213 A CN 109827213A CN 201910125333 A CN201910125333 A CN 201910125333A CN 109827213 A CN109827213 A CN 109827213A
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- China
- Prior art keywords
- noise reduction
- orifice plate
- blower
- noise
- main blower
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Abstract
A kind of noise reducing type range hood, including blower rack, lower chambers and upper chamber are divided into inside blower rack, main blower is installed in bottom chamber, secondary fan is installed in upper chamber, main fan outlet and secondary fan air inlet configured in fluid communication, upper chamber and lower chambers are mutually separated by the first noise reduction orifice plate and the second noise reduction orifice plate, first noise reduction orifice plate is the outlet air oralia of main blower, second noise reduction orifice plate is set to the rear side of main blower, and the air-inlet cavity being connected with lower chambers is equipped in the front side of main blower.The present invention has the advantages that when blower fan system work, the noise that main blower generates imports lower chambers and carries out noise reduction by the first, second closing resonant cavity that orifice plate and upper chamber are formed of making an uproar, the noise that secondary fan generates carries out noise reduction by the closing resonant cavity that the first, second noise reduction orifice plate and lower chambers are formed, form a kind of series connection noise reduction system of couple each other, especially there is preferable noise reduction effect to low frequency, increases noise reduction bandwidth.
Description
Technical field
The present invention relates to a kind of range hoods, more particularly, to a kind of noise reducing type range hood.
Background technique
When in use, oil smoke is needed through resistances such as smoke exhaust pipe, check (non-return) valve and discharge flues the range hood of normal domestic use
Oil smoke is discharged device, the presence of these resistance devices so that oil smoke at oil smoke outlet there are certain back pressure, back pressure
In the presence of the air draft flow that can largely effect on kitchen ventilator.In order to overcome back pressure bring adverse effect as far as possible, people have been designed
The concatenated range hood of two fans is gone out, such as application No. is 201410119596.7 (application publication number are 104949172 A of CN)
Chinese invention patent application disclosed in " a kind of series connection two fans type range hood ", the series connection two fans type range hood will
Blower hood is divided into two chambers, main assembling up and down and is mounted in upper chamber in bottom chamber, secondary fan.Main wind
Machine is typically applied to overcome preceding end resistance, that is, overcomes the lampblack filter that front end is arranged in, oil guide plate, cowling panel, smoke barrier
Deng resistance, secondary fan is typically applied to overcome rear end resistance, i.e. smoke pipe resistance and common flue back pressure.Although pass through by
The series connection of two blowers come promote static pressure with overcome back pressure bring adversely affect, smoke suction effect can be obviously improved, still,
Due to the structure type of two-stage series connection, needs for this two-level configuration to be all put into shell in product design, allow in this way
The larger of inside configuration cavity, so that in range hood lower frequency, it is easy to which the vibration for causing casing cavity causes
Range hood sound quality is poor and magnitude of sound is larger, furthermore, noise of the two fans system under low-resistance force environment is larger.
In order to reduce the noise of range hood, people have invented the various range hoods with denoising structure, such as patent No.
" a kind of squelch type disclosed in Chinese invention patent for 201310627547.X (Authorization Notice No. is 103697512 B of CN)
Range hood ", the air-inlet cavity and complete machine shell of the range hood are simultaneously not isolated from, and noise reduction closing chamber is located at the front shroud of complete machine
In inside face blower fan system import and shunting wind deflector, according to known to structure, two kinds of noise reduction closing chambers are respectively positioned on air intake passage
On path, due to consider the influence to air inlet air-flow, micropore closing chamber is all made smaller, the distance of micropore to rigid walls
It is smaller, therefore noise reduction frequency can be relatively high, it is difficult to be effectively reduced under the operating condition of laboratory and accounts for most low-frequency noise.
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, providing a kind of pair of low frequency noise has
The noise reducing type range hood of preferable noise reduction effect.
The technical scheme of the invention to solve the technical problem is: the noise reducing type range hood, including blower rack,
Lower chambers and upper chamber are divided into inside the blower rack, main blower are installed in the bottom chamber, in the upper chamber
Secondary fan, the air outlet of the main blower and the air inlet configured in fluid communication of secondary fan are inside installed, it is characterised in that:
It is mutually separated between the upper chamber and lower chambers by the first noise reduction orifice plate and the second noise reduction orifice plate, the first noise reduction orifice plate is
The outlet air oralia of main blower, the second noise reduction orifice plate is set to the rear side of the main blower, before the main blower
Side is equipped with the air-inlet cavity being connected with lower chambers.
Preferentially, the second noise reduction orifice plate is obliquely installed relative to upright plane, and is tilted obliquely from front to back.Second
After noise reduction orifice plate uses inclined design, noise reduction orifice plate can be made to the distance change of rigid walls, it is low so as to greatly improve
The noise reduction amplitude of bandwidth domain noise component(s).
Further preferably, the second noise reduction orifice plate is 0 ° of 50 ° of ﹤ α ﹤ relative to upright plane range of tilt angles.
In order to obtain better noise reduction effect, the aperture model in the noise reduction hole of the first noise reduction orifice plate and the second noise reduction orifice plate
It encloses for 0.2mm ﹤ d ﹤ 0.3mm, the spacing range between adjacent noise reduction hole is 2mm ﹤ t ﹤ 6mm.
In order to increase the rigidity of upper and lower chambers, to effectively reduce low-frequency vibration, the upper side edge of the second noise reduction orifice plate
Mutually it is connected with the back side edge of the first noise reduction orifice plate.
In order to further decrease fan noise, pass through between the air outlet of the main blower and the air inlet of secondary fan
Wind-guiding connecting tube is connected.
Main blower and secondary fan can be there are many mounting structures, it is preferable that the main blower and secondary fan are equal
For single air intake centrifugal blower of front side air inlet, the main blower and secondary fan turn forward setting both with respect to upright plane,
Also, the air intake surface of main blower and the air intake surface of secondary fan are parallel to each other.
Further preferably, the air inlet of the main blower is equipped with oblique partition, and the upper side edge of the oblique partition connects
It connects in the front side edge of the first noise reduction orifice plate, oblique partition tilts obliquely from front to back, the front side of the oblique partition
Form the air-inlet cavity.
Further preferably, be provided with through-hole on the back shroud of the main blower, the air-inlet cavity by the through-hole with it is described
Lower chambers are connected.In this way, the noise of main blower can be imported lower chambers by the through-hole of back shroud.
Further preferably, electric machine support is installed on the back shroud, the motor of the main blower is mounted on described
On electric machine support.
Further preferably, the outlet air being connected with the secondary fan air outlet is installed at the top of the blower rack
Cover.
Compared with the prior art, the advantages of the present invention are as follows: the noise reducing type range hood is according to the basic of micropore noise reduction chamber
Principle will be divided into upper chamber and lower chambers inside blower rack, and when blower fan system work, the noise that main blower generates is imported
Lower chambers, and noise reduction is carried out by the closing resonant cavity that the first noise reduction orifice plate and the second noise reduction orifice plate and upper chamber are formed, it is secondary
The noise that blower generates carries out noise reduction by the closing resonant cavity that the first noise reduction orifice plate and the second noise reduction orifice plate and lower chambers are formed,
The series connection noise reduction system for foring a kind of couple each other makes the fan noise of primary and secondary two-stage that can obtain micropore resonance noise reduction, especially
It has preferable noise reduction effect to low-frequency noise, increases noise reduction bandwidth.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the schematic diagram of internal structure of the embodiment of the present invention；
Fig. 3 is another schematic diagram of internal structure of the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the upper chamber of the embodiment of the present invention, lower chambers and air-inlet cavity；
Fig. 5 is the structural schematic diagram of the centrifugal blower of the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of the first noise reduction orifice plate of the embodiment of the present invention；
Fig. 7 is the enlarged diagram of part A in Fig. 6；
Fig. 8 is the structural schematic diagram of the second noise reduction orifice plate of the embodiment of the present invention.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
As shown in Figures 1 to 8, noise reducing type range hood includes blower rack 1, and lower chambers 2 and upper are divided into inside blower rack 1
Chamber 3 is equipped with main blower 4 in lower chambers 2, and secondary fan 5, the air outlet of main blower 4 are equipped in upper chamber 3
Air inlet with secondary fan 5 is equipped with and secondary fan 5 by 9 configured in fluid communication of wind-guiding connecting tube at the top of blower rack 1
The outlet housing 11 that air outlet is connected.In the present embodiment, main blower 4 and secondary fan 5 be the list entered the wind of front side enter the wind from
Heart blower, main blower 4 and secondary fan 5 turn forward setting, also, the air intake surface of main blower 4 both with respect to upright plane
It is parallel to each other with the air intake surface of secondary fan 5.
In the present embodiment, mutually divided by the first noise reduction orifice plate 6 with the second noise reduction orifice plate 7 between upper chamber 3 and lower chambers 2
Every.The upper side edge of second noise reduction orifice plate 7 is mutually connected with the back side edge of the first noise reduction orifice plate 6, it is possible thereby to increase complete machine cavity
Rigidity, effectively reduces low-frequency vibration.The pore diameter range of the noise reduction hole h of first noise reduction orifice plate 6 and the second noise reduction orifice plate 7 is 0.2mm ﹤
D ﹤ 0.3mm, the spacing range between adjacent noise reduction hole are 2mm ﹤ t ﹤ 6mm.
It is preceding to the first noise reduction orifice plate 6 is the outlet air oralia of main blower 4, the second drop with direction shown in arrow B in Fig. 4
Orifice plate 7 of making an uproar is set to the rear side of main blower 4 and is obliquely installed relative to upright plane, and tilts obliquely from front to back.This implementation
In example, the second noise reduction orifice plate 7 is 0 ° of 50 ° of ﹤ α ﹤ relative to upright plane range of tilt angles.According to the substantially former of micropore noise reduction chamber
Reason after the second noise reduction orifice plate 7 is obliquely installed, makes the second noise reduction orifice plate 7 arrive the distance of rigid walls using the feature of complete machine cavity depth
It is larger and can be changed, so as to greatly promote the noise reduction amplitude of low frequency wide area noise component(s), to reducing noise and improvement sound product
Matter has preferable effect, and test result is shown, can reduce by 1.5 decibels of noise or more, sound quality improves.In addition, main blower 4
Air inlet oblique partition 10 is installed, the upper side edge of oblique partition 10 is connected in the front side edge of the first noise reduction orifice plate 6, oblique
Partition 10 tilts obliquely from front to back, and the front side of oblique partition 10 forms air-inlet cavity 8.
As shown in figure 5, being provided with through-hole 42 on the back shroud 41 of main blower 4, air-inlet cavity 8 passes through through-hole 42 and lower chambers 2
It is connected, the noise of main blower 4 enters lower chambers 2 by through-hole 42.Electric machine support 43, main are installed on back shroud 41
The motor 44 of blower 4 is mounted on electric machine support 43.
Microwell plate resonance sound-absorbing principle is as follows:
Perforation board resonance sound absorption structure is widely used in noise control engineering, it is assumed that one piece of perforated plate is placed in parallel in
Rigid plane front distance is all round closure at D, and perforated plate just constitutes a resonance sound-absorbing with occluded airs layer behind and fills
It sets, it can be regarded as many Helmholz resonance devices and composes in parallel.The resonant frequency of conventional punch structure are as follows:
Wherein, σ=NS1/S2, the referred to as punching rate of perforated plate, S1 are the cross-sectional area of aperture, and S2 is the face of perforated plate
Product.
According to micropore noise reduction resonant frequency it is found that punching rate is smaller, resonant frequency is lower；Perforated plate is thicker, resonant frequency
It is lower；Hole is remoter to rigid walls distance, and resonant frequency is lower.
The working principle of the noise reducing type range hood is as follows:
When blower fan system works, impeller under the action of motor 44 of main blower 4 is rotated, and main blower fan system is arranged
Gas out is sent into secondary fan system, then is discharged under the rotation of secondary motor 5 by outlet housing 11.Meanwhile main blower
The noise of system enters lower chambers 2 by the through-hole 42 on back shroud 41, and passes through the first noise reduction orifice plate 6 and the second noise reduction orifice plate
7 carry out noise reduction with the closing resonant cavity that upper chamber 3 is formed, and the noise that secondary fan 5 generates passes through the first noise reduction orifice plate 6 and second
The closing resonant cavity that noise reduction orifice plate 7 and lower chambers 2 are formed carries out noise reduction, forms a kind of series connection noise reduction system of couple each other,
Make the fan noise of primary and secondary two-stage that can obtain micropore resonance noise reduction, greatly reduces noise reduction frequency, increase noise reduction bandwidth.
Claims (11)
1. a kind of noise reducing type range hood, including blower rack (1), the blower rack (1) is internal to be divided into lower chambers (2) and epicoele
Room (3) is equipped with main blower (4) in the lower chambers (2), is equipped with secondary fan (5) in the upper chamber (3),
The air outlet of the main blower (4) and the air inlet configured in fluid communication of secondary fan (5), it is characterised in that: the upper chamber
(3) it is mutually separated between lower chambers (2) by the first noise reduction orifice plate (6) and the second noise reduction orifice plate (7), the first noise reduction orifice plate
It (6) is the outlet air oralia of main blower (4), the second noise reduction orifice plate (7) is set to the rear side of the main blower (4), in institute
The front side for stating main blower (4) is equipped with the air-inlet cavity (8) being connected with lower chambers (2).
2. noise reducing type range hood according to claim 1, it is characterised in that: the second noise reduction orifice plate (7) relative to
Upright plane is obliquely installed, and is tilted obliquely from front to back.
3. noise reducing type range hood according to claim 2, it is characterised in that: the second noise reduction orifice plate (7) relative to
Upright plane range of tilt angles is 0 ° of 50 ° of ﹤ α ﹤.
4. noise reducing type range hood according to claim 1, it is characterised in that: the first noise reduction orifice plate (6) and second
The pore diameter range in the noise reduction hole of noise reduction orifice plate (7) is 0.2mm ﹤ d ﹤ 0.3mm, and the spacing range between adjacent noise reduction hole is 2mm ﹤ t ﹤
6mm。
5. noise reducing type range hood according to claim 1, it is characterised in that: the upside of the second noise reduction orifice plate (7)
Side is mutually connected with the back side edge of the first noise reduction orifice plate (6).
6. noise reducing type range hood according to claim 1, it is characterised in that: the air outlet of the main blower (4) with
It is connected between the air inlet of secondary fan (5) by wind-guiding connecting tube (9).
7. noise reducing type range hood according to claim 1, it is characterised in that: the main blower (4) and secondary fan
(5) be single air intake centrifugal blower that front side is entered the wind, the main blower (4) and secondary fan (5) both with respect to upright plane to
Top rake setting, also, the air intake surface of main blower (4) and the air intake surface of secondary fan (5) are parallel to each other.
8. noise reducing type range hood according to claim 1, it is characterised in that: the air inlet of the main blower is equipped with
The upper side edge of oblique partition (10), the oblique partition (10) is connected in the front side edge of the first noise reduction orifice plate (6), oblique
Partition (10) tilts obliquely from front to back, and the front side of oblique partition (10) forms the air-inlet cavity (8).
9. noise reducing type range hood according to claim 1, it is characterised in that: the back shroud of the main blower (4)
(41) it is provided on through-hole (42), the air-inlet cavity (8) is connected by the through-hole (42) with the lower chambers (2).
10. noise reducing type range hood according to claim 9, it is characterised in that: be equipped on the back shroud (41)
The motor (44) of electric machine support (43), the main blower (4) is mounted on the electric machine support (43).
11. according to claim 1 to noise reducing type range hood described in any claim in 10, it is characterised in that: described
The outlet housing (11) being connected with the secondary fan (5) air outlet is installed at the top of blower rack (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125333.XA CN109827213A (en) | 2019-02-20 | 2019-02-20 | A kind of noise reducing type range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125333.XA CN109827213A (en) | 2019-02-20 | 2019-02-20 | A kind of noise reducing type range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109827213A true CN109827213A (en) | 2019-05-31 |
Family
ID=66863820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910125333.XA Withdrawn CN109827213A (en) | 2019-02-20 | 2019-02-20 | A kind of noise reducing type range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109827213A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526267A (en) * | 2020-11-23 | 2022-05-24 | 广东美的白色家电技术创新中心有限公司 | Fan and range hood |
-
2019
- 2019-02-20 CN CN201910125333.XA patent/CN109827213A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526267A (en) * | 2020-11-23 | 2022-05-24 | 广东美的白色家电技术创新中心有限公司 | Fan and range hood |
| CN114526267B (en) * | 2020-11-23 | 2024-01-30 | 广东美的白色家电技术创新中心有限公司 | Fan and range hood |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190531 |