CN206207692U - Perforation air-ducting ring, air-conditioner outdoor unit and air-conditioner - Google Patents
Perforation air-ducting ring, air-conditioner outdoor unit and air-conditioner Download PDFInfo
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- CN206207692U CN206207692U CN201621270615.7U CN201621270615U CN206207692U CN 206207692 U CN206207692 U CN 206207692U CN 201621270615 U CN201621270615 U CN 201621270615U CN 206207692 U CN206207692 U CN 206207692U
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- ducting ring
- ring body
- outdoor unit
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Abstract
The utility model provides a kind of perforation air-ducting ring, and for air-conditioner outdoor unit, air-conditioner outdoor unit includes side plate, top cover and axial-flow windwheel, and perforation air-ducting ring includes：Air-ducting ring body, air-ducting ring body has the cavity of opening for upper and lower ends, and through hole is provided with air-ducting ring body, and strip convex tendon is disposed with the outer wall circumference of air-ducting ring body；Wherein, axial-flow windwheel is arranged in cavity, and side plate is arranged in the circumference of air-ducting ring body, and the upper port of side plate and air-ducting ring body is adapted to installation with top cover, and air-ducting ring body, side plate and top cover define chamber jointly.The perforation air-ducting ring that the utility model is provided, multiple through holes are provided with air-ducting ring body, air-ducting ring body constitutes a cavity for relative closure with the side plate and top cover of surrounding, using the principle of perforated plate resonant silencing, the noise of below 240Hz frequency bands is reduced, so as to improve tonequality.Wherein, by set through-hole aperture, punching rate, air-ducting ring installing space reduce axial flow blower rotational noise.
Description
Technical field
The utility model is related to air-conditioning equipment field, in particular to one kind perforation air-ducting ring, a kind of air-conditioner outdoor unit
With a kind of air-conditioner.
Background technology
At present, top air-out major diameter axial flow blower structure is used VRF air conditioning system, as outer machine minimizes peace more
The development of platform, the rotating speed high of axial flow blower, ever-larger diameterses development trend are obvious.Fan noise is main by rotational noise and vortex
Noise is constituted, and wherein rotational noise is the principal element for influenceing blower fan tonequality based on the discrete noise of low frequency.With rotating speed
Increase, the rotational noise based on low-frequency component becomes apparent compared to eddy current crack speedup, this low frequency " drone " abnormal sound
Also what is highlighted is more obvious.With this paradoxically, with the raising of room rate, building more crypto set, the installation for leaving outer machine for is empty
Between and insulating space it is also smaller, this sound be easier trigger periphery user dislike and complaint.
In the related art, for axial flow blower low-frequency noise in terms of mostly from change blade quantity, blade pitgh, leaf
The aspects such as plate shape are started with, such as patent CN201520944895.4 uses the leafy axial-flow leaf of Unequal distance, and this mode is compared
In equidistant axial-flow leaf, single BPF (blade pass frequency, blade passing frequency) can be become multiple BPF
Noise.This mode substitutes single noise equivalent to broadband noise, and although tonequality feel there is a little improvement, but cannot reduce it
Amplitude.
Utility model content
The utility model is intended at least solve one of technical problem present in prior art or correlation technique.
Therefore, first purpose of the utility model is to propose a kind of perforation air-ducting ring.
Second purpose of the present utility model is to propose a kind of air-conditioner outdoor unit.
A kind of further object of the present utility model, it is also proposed that air-conditioner.
In view of this, according to first purpose of the present utility model, the utility model provides a kind of perforation air-ducting ring, uses
In air-conditioner outdoor unit, air-conditioner outdoor unit includes side plate, top cover and axial-flow windwheel, and perforation air-ducting ring includes：Air-ducting ring body, wind-guiding
Circle body has the cavity of opening for upper and lower ends, through hole is provided with air-ducting ring body, in the outer wall circumference of air-ducting ring body
It is disposed with strip convex tendon；Wherein, axial-flow windwheel is arranged in cavity, and side plate is arranged in the circumference of air-ducting ring body, side plate and
The upper port of air-ducting ring body is adapted to installation with top cover, and air-ducting ring body, side plate and top cover define chamber jointly.
The perforation air-ducting ring that the utility model is provided, is provided with multiple through holes, air-ducting ring body and surrounding on air-ducting ring body
Side plate and top cover constitute a cavity for relative closure, using the principle of perforated plate resonant silencing, reduce below 240Hz frequency bands
Noise, so as to improve tonequality.Wherein, by set through-hole aperture, punching rate, air-ducting ring installing space reduce axle stream wind
Machine rotational noise.The purpose of this utility model is to provide a kind of solution that can reduce axial flow blower rotational noise,
On the premise of not increasing cost and influence space, improve using the air-conditioner of the air-ducting ring.When axial-flow windwheel runs, blade is high
Speed strike air can form the rotational noise of low frequency, so as to excite air vibration, further passing noise.Due to air-ducting ring body
On be provided with multiple through holes, and form a cavity for opposing seal with side plate and top cover, this just forms a resonator.Work as incidence
The frequency of sound wave close to resonator intrinsic frequency when, the air column of through-hole aperture can produce judder, in vibration processes,
Due to overcome frictional resistance and sound energy consumption, so as to play a part of noise elimination.Bar is disposed with the outer wall circumference of air-ducting ring body
Shape convex tendon, increased the structural stability of air-ducting ring body.
In addition, the perforation air-ducting ring in above-described embodiment of the utility model offer can also have following supplementary technology special
Levy：
In the above-mentioned technical solutions, it is preferable that through hole is circular hole, the diameter span of circular hole 2.5mm to 10mm it
Between.
In the technical scheme, through hole is used as by setting circular hole, facilitates machine-shaping, while the diameter for setting circular hole takes
Value scope is to reduce the optimal value of axial flow blower rotational noise between 2.5mm to 10mm, and aperture on air-ducting ring body can be with
It is same diameter, or is made up of different-diameter.
In the above-mentioned technical solutions, it is preferable that the diameter value of circular hole is between 3mm to 5mm.
In the technical scheme, by being to reduce axial flow blower rotation to make an uproar between the diameter value 3mm to 5mm for setting circular hole
The optimal value of sound.
In the above-mentioned technical solutions, it is preferable that through hole is non-circular hole, and the sectional area span of non-circular hole is in 20mm2Extremely
250mm2Between.
In the technical scheme, through hole can be circular or other shapes, when for non-circular hole, the sectional area of non-circular hole
Span is in 20mm2To 250mm2Between, this is beneficial to reduce axial flow blower rotational noise.
In the above-mentioned technical solutions, it is preferable that the effective area of all through holes is less than the air-ducting ring bulk area
5%.
In the technical scheme, through hole accounts for the area of air-ducting ring body less than 5%, i.e. the effective punching rate of air-ducting ring body is small
It is the preferred value for effectively reducing axial flow blower rotational noise in 5%.
According to second purpose of the present utility model, it is also proposed that a kind of air-conditioner outdoor unit, including any of the above-described technical side
The perforation air-ducting ring of case.
The air-conditioner outdoor unit that second purpose of the present utility model is provided, because including first perforation air-ducting ring of purpose,
Therefore there are whole beneficial effects of perforation air-ducting ring.
In the above-mentioned technical solutions, it is preferable that air-conditioner outdoor unit also includes：Porous sound absorption plate, porous sound absorption plate is covered in
The outer wall of air-ducting ring body.
It is attached certain thickness porous in the outer wall of air-ducting ring body after air-ducting ring body is installed in the technical scheme
Porous sound absorption plate, is typically pasted onto air-ducting ring body outer wall by sound-absorbing material, such as porous sound absorption plate by way of pasting, and really
Guarantor covers all of through hole.When sound-absorbing porous material of the sound wave through air-ducting ring body outer wall, also can same porous sound absorption
Material produces friction, and acoustic energy is changed into heat energy, further reduces noise.
In the above-mentioned technical solutions, it is preferable that air-conditioner outdoor unit is further included：Motor, axial-flow windwheel is fixed on motor
On；Electric machine support, motor is fixed by screws on electric machine support；Support beam, air-ducting ring body and electric machine support are each attached to
In support beam；Wherein, the axis coinciding of the axle center of air-ducting ring body and axial-flow windwheel.
In the technical scheme, axial-flow windwheel is fixed on motor, and motor is fixed by screws on electric machine support, motor
Support is finally fixed above support beam and heat exchanger.The air-ducting ring that coaxial flow wind wheel coordinates is also mounted at support beam and heat exchanger
Above, coaxial flow wind wheel keeps coaxial.So as to the reduction axial flow blower rotational noise of stabilization.
In the above-mentioned technical solutions, it is preferable that the middle part of top cover is provided with guard.
In the technical scheme, the need for 26S Proteasome Structure and Function, the middle part of top cover typically sets perforate, and guard is then
It is fixed on top cover position of opening, plays a part of to protect axial-flow windwheel.
According to further object of the present utility model, it is also proposed that a kind of air-conditioner, including any of the above-described technical scheme is worn
The air-conditioner outdoor unit of hole air-ducting ring or any of the above-described technical scheme.
The air-conditioner that further object of the present utility model is provided, because of the perforation air-ducting ring including any of the above-described technical scheme
Or the air-conditioner outdoor unit of any of the above-described technical scheme, therefore the whole beneficial effects with perforation air-ducting ring and air-conditioner outdoor unit.
To sum up, the utility model is provided perforation air-ducting ring, air-conditioner outdoor unit and air-conditioner, by air-ducting ring body
Through hole is set, and air-ducting ring body outer wall has certain thickness sound-absorbing porous material, side plate of the air-ducting ring body with surrounding and top
Lid one cavity of relative closure of composition, axial-flow windwheel is fixed on motor, and motor is fixed by screws on electric machine support, electricity
Machine support is finally fixed above support beam and heat exchanger, and the air-ducting ring that coaxial flow wind wheel coordinates is also mounted at support beam and heat exchange
Above device, guard is then fixed on top cover, constitutes the fan air duct system of the utility model air-conditioner, so as to reduce axle stream wind
Machine rotational noise, low cost, does not influence space.
Additional aspect of the present utility model and advantage will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Of the present utility model above-mentioned and/or additional aspect and advantage will from description of the accompanying drawings below to embodiment is combined
Become substantially and be readily appreciated that, wherein：
Fig. 1 shows the perforation air-ducting ring front view according to one embodiment of the present utility model；
Fig. 2 shows the perforation air-ducting ring top view according to one embodiment of the present utility model；
Fig. 3 shows the perforation air-ducting ring stereogram according to one embodiment of the present utility model；
Fig. 4 shows the air-conditioner outdoor unit sectional view according to one embodiment of the present utility model；
Fig. 5 shows air-conditioner outdoor unit part A enlarged diagrams of the Fig. 4 according to another embodiment of the present utility model.
Wherein, the corresponding relation between the reference and component names in Fig. 1 to Fig. 5 is：
2 perforation air-ducting rings, 22 air-ducting ring bodies, 24 through holes, 4 side plates, 6 top covers, 8 axial-flow windwheels, 10 porous sound absorption plates, 12
Motor, 14 electric machine supports, 16 support beams, 18 guards.
Specific embodiment
In order to be more clearly understood that above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the accompanying drawings and tool
Body implementation method is further described in detail to the utility model.It should be noted that in the case where not conflicting, this Shen
Feature in embodiment please and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the utility model, but, this practicality
It is new to be different from other modes described here using other to implement, therefore, protection domain of the present utility model is simultaneously
Do not limited by following public specific embodiment.
Referring to Fig. 1 to Fig. 5 descriptions according to the utility model some embodiments perforation air-ducting ring, air-conditioner outdoor unit
And air-conditioner.
As shown in Figures 1 to 5, the utility model proposes one kind perforation air-ducting ring 2, for air-conditioner outdoor unit, air conditioning chamber
Outer machine includes side plate 4, top cover 6 and axial-flow windwheel 8, and perforation air-ducting ring 2 includes：Air-ducting ring body 22, air-ducting ring body 22 is upper
Lower two ends have the cavity of opening, and through hole 24 is provided with air-ducting ring body 22, are arranged in the outer wall circumference of air-ducting ring body 22
There is strip convex tendon；Wherein, axial-flow windwheel 8 is arranged in cavity, and side plate 4 is arranged in the circumference of air-ducting ring body 22, side plate 4 and
The upper port of air-ducting ring body 22 is adapted to installation with top cover 6, and air-ducting ring body 22, side plate 4 define chamber jointly with top cover 6
Room.
The perforation air-ducting ring 2 that the utility model is provided, is provided with multiple through holes 24, air-ducting ring body 22 on air-ducting ring body 22
Side plate 4 and top cover 6 with surrounding constitute a cavity for relative closure, using the principle of perforated plate resonant silencing, reduce 240Hz
The noise of following frequency band, so as to improve tonequality.Wherein, by set the aperture of through hole 24, punching rate, air-ducting ring installing space come
Reduce axial flow blower rotational noise.The purpose of this utility model is to provide a kind of solution that can reduce axial flow blower rotational noise
Certainly scheme, on the premise of cost and influence space is not increased, improves using the air-conditioner of the air-ducting ring.When axial-flow windwheel 8 is transported
During row, blade hits at a high speed air and can form the rotational noise of low frequency, so as to excite air vibration, further passing noise.By
In being provided with multiple through holes 24 on air-ducting ring body 22, and a cavity for opposing seal is formed with side plate 4 and top cover 6, this is with regard to shape
Into a resonator.When incident acoustic wave frequency close to resonator intrinsic frequency when, the air column in the aperture of through hole 24 can be produced
Judder, in vibration processes, due to overcome frictional resistance and sound energy consumption, so as to play a part of noise elimination.Air-ducting ring sheet
Strip convex tendon is disposed with the outer wall circumference of body 22, the structural stability of air-ducting ring body 22 is increased.
Specifically, blower fan speedWherein n is the number of blade for rotating speed rpm, Z.Can in view of blade
By property, the axial-flow leaf rotating speed general control of air conditioner outdoor machine is in below 1200rpm, the blade of the number of blade 4, it is possible thereby to learn
Blower fan speed is 80Hz.Energy in view of blower fan rotational noise is concentrated mainly on below 3 ranks, namely 240Hz.So this
The purpose of utility model is intended to by improving air guide ring structure, using the principle of perforated plate resonant silencing, reduces below 240Hz frequencies
The noise of band, so as to improve tonequality.
It can be seen from perforated plate resonant silencing principle, air-ducting ring resonant frequency
Wherein：L --- air-ducting ring is with the air layer thickness between side plate
The thickness of t --- air-ducting ring
D --- aperture
C --- the velocity of sound
P --- punching rate
According to above formula, and with reference to air-ducting ring installing space can extrapolate can reduce the corresponding aperture of rotational noise,
Punching rate etc..
In addition, the perforation air-ducting ring 2 in above-described embodiment of the utility model offer can also have following supplementary technology
Feature：
In one embodiment of the present utility model, it is preferable that through hole 24 is circular hole, the diameter span of circular hole exists
Between 2.5mm to 10mm.
In this embodiment, it is used as through hole 24 by setting circular hole, facilitates machine-shaping, while the diameter for setting circular hole takes
Value scope is to reduce the optimal value of axial flow blower rotational noise between 2.5mm to 10mm, and the aperture on air-ducting ring body 22 can
To be same diameter, or be made up of different-diameter.
In one embodiment of the present utility model, it is preferable that the diameter value of circular hole is between 3mm to 5mm.
In this embodiment, by being to reduce axial flow blower rotational noise between the diameter value 3mm to 5mm for setting circular hole
Optimal value.
In one embodiment of the present utility model, it is preferable that through hole 24 is non-circular hole, the sectional area value model of non-circular hole
It is trapped among 20mm2To 250mm2Between.
In this embodiment, through hole 24 can be circular or other shapes, when for non-circular hole, the sectional area of non-circular hole
Span is in 20mm2To 250mm2Between, this is beneficial to reduce axial flow blower rotational noise.
In one embodiment of the present utility model, it is preferable that the effective area of all through holes 24 is led less than described
The 5% of the area of solar or lunar halo body 22.
In this embodiment, through hole 24 accounts for the area of air-ducting ring body 22 less than the effectively perforation of 5%, i.e. air-ducting ring body 22
Rate is less than 5%, is the preferred value for effectively reducing axial flow blower rotational noise.
According to second purpose of the present utility model, it is also proposed that a kind of air-conditioner outdoor unit, including any of the above-described technical side
The perforation air-ducting ring 2 of case.
The air-conditioner outdoor unit that second purpose of the present utility model is provided, because including first perforation air-ducting ring 2 of purpose,
Therefore there are whole beneficial effects of perforation air-ducting ring 2.
In one embodiment of the present utility model, it is preferable that air-conditioner outdoor unit also includes：Porous sound absorption plate 10, it is porous
Acoustic board 10 is covered in the outer wall of air-ducting ring body 22.
In this embodiment, it is attached certain thickness many in the outer wall of air-ducting ring body 22 after air-ducting ring body 22 is installed
Porous sound absorption plate 10, is typically pasted onto air-ducting ring body 22 by hole sound absorbing material, such as porous sound absorption plate 10 by way of pasting
Outer wall, and ensure to cover all of through hole 24.When sound-absorbing porous material of the sound wave through the outer wall of air-ducting ring body 22,
Friction can be produced with sound-absorbing porous material, acoustic energy is changed into heat energy, further reduce noise.
In one embodiment of the present utility model, it is preferable that air-conditioner outdoor unit is further included：Motor 12, axle stream wind
Wheel 8 is fixed on motor 12；Electric machine support 14, motor 12 is fixed by screws on electric machine support 14；Support beam 16, air-ducting ring
Body 22 and electric machine support 14 are each attached in support beam 16；Wherein, the axle center of the axle center of air-ducting ring body 22 and axial-flow windwheel 8
Overlap.
In this embodiment, axial-flow windwheel 8 is fixed on motor 12, and motor 12 is fixed by screws in electric machine support 14
On, electric machine support 14 is finally fixed above support beam 16 and heat exchanger.The air-ducting ring that coaxial flow wind wheel 8 coordinates is also mounted at branch
Above support beam 16 and heat exchanger, coaxial flow wind wheel 8 keeps coaxial.So as to the reduction axial flow blower rotational noise of stabilization.
In one embodiment of the present utility model, it is preferable that the middle part of top cover 6 is provided with guard 18.
In this embodiment, the need for due to 26S Proteasome Structure and Function, the middle part of top cover 6 typically sets perforate, guard 18
Then it is fixed on the position of opening of top cover 6, plays a part of to protect axial-flow windwheel 8.
According to further object of the present utility model, it is also proposed that a kind of air-conditioner, including any of the above-described technical scheme is worn
The air-conditioner outdoor unit of hole air-ducting ring 2 or any of the above-described technical scheme.
The air-conditioner that further object of the present utility model is provided, because of the perforation air-ducting ring including any of the above-described technical scheme
The air-conditioner outdoor unit of 2 or any of the above-described technical schemes, therefore the beneficial effect of whole with perforation air-ducting ring 2 and air-conditioner outdoor unit
Really.
To sum up, the utility model is provided perforation air-ducting ring, air-conditioner outdoor unit and air-conditioner, by air-ducting ring body
Through hole is set, and air-ducting ring body outer wall has certain thickness sound-absorbing porous material, side plate of the air-ducting ring body with surrounding and top
Lid one cavity of relative closure of composition, axial-flow windwheel is fixed on motor, and motor is fixed by screws on electric machine support, electricity
Machine support is finally fixed above support beam and heat exchanger, and the air-ducting ring that coaxial flow wind wheel coordinates is also mounted at support beam and heat exchange
Above device, guard is then fixed on top cover, constitutes the fan air duct system of the utility model air-conditioner, so as to reduce axle stream wind
Machine rotational noise, low cost, does not influence space.
In the utility model, term " multiple " then refers to two or more, unless otherwise clearly restriction.Term
The term such as " installation ", " connected ", " connection ", " fixation " all should be interpreted broadly, for example, " connection " can be fixedly connected,
Can be detachably connected, or be integrally connected；" connected " can be joined directly together, it is also possible to by the indirect phase of intermediary
Even.For the ordinary skill in the art, can as the case may be understand above-mentioned term in the utility model
Concrete meaning.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that the specific features, structure, material or the feature that are described with reference to the embodiment or example are contained in of the present utility model at least one
In individual embodiment or example.In this manual, the schematic representation to above-mentioned term is not necessarily referring to identical embodiment
Or example.And, the specific features of description, structure, material or feature can be in one or more any embodiments or examples
In combine in an appropriate manner.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (10)
1. a kind of perforation air-ducting ring, for air-conditioner outdoor unit, the air-conditioner outdoor unit includes side plate, top cover and axial-flow windwheel, its
It is characterised by, the perforation air-ducting ring includes：
Air-ducting ring body, the air-ducting ring body has the cavity of opening for upper and lower ends, is provided with the air-ducting ring body
Through hole, strip convex tendon is disposed with the outer wall circumference of the air-ducting ring body；
Wherein, the axial-flow windwheel is arranged in the cavity, and the side plate is arranged in the circumference of the air-ducting ring body, institute
The upper port for stating side plate and the air-ducting ring body is adapted to installation with the top cover, the air-ducting ring body, the side plate with
The top cover defines chamber jointly.
2. perforation air-ducting ring according to claim 1, it is characterised in that the through hole is circular hole, the diameter of the circular hole
Span is between 2.5mm to 10mm.
3. perforation air-ducting ring according to claim 2, it is characterised in that the diameter value of the circular hole be 3mm to 5mm it
Between.
4. perforation air-ducting ring according to claim 1, it is characterised in that the through hole is non-circular hole, the non-circular hole
Sectional area span is in 20mm2To 250mm2Between.
5. perforation air-ducting ring according to any one of claim 1 to 4, it is characterised in that all through holes it is effective
5% of area less than the air-ducting ring bulk area.
6. a kind of air-conditioner outdoor unit, it is characterised in that including the perforation air-ducting ring as any one of claim 1 to 5.
7. air-conditioner outdoor unit according to claim 6, it is characterised in that the air-conditioner outdoor unit also includes：
Porous sound absorption plate, the porous sound absorption plate is covered in the outer wall of the air-ducting ring body.
8. air-conditioner outdoor unit according to claim 7, it is characterised in that the air-conditioner outdoor unit is further included：
Motor, the axial-flow windwheel is fixed on the motor；
Electric machine support, the motor is fixed by screws on the electric machine support；
Support beam, the air-ducting ring body and the electric machine support are each attached in the support beam；
Wherein, the axis coinciding of the axle center of the air-ducting ring body and the axial-flow windwheel.
9. air-conditioner outdoor unit according to claim 8, it is characterised in that the middle part of the top cover is provided with guard.
10. a kind of air-conditioner, it is characterised in that including：
Perforation air-ducting ring as any one of claim 1 to 5；Or
Air-conditioner outdoor unit as described in claim 6 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621270615.7U CN206207692U (en) | 2016-11-22 | 2016-11-22 | Perforation air-ducting ring, air-conditioner outdoor unit and air-conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621270615.7U CN206207692U (en) | 2016-11-22 | 2016-11-22 | Perforation air-ducting ring, air-conditioner outdoor unit and air-conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN206207692U true CN206207692U (en) | 2017-05-31 |
Family
ID=58747214
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621270615.7U Active CN206207692U (en) | 2016-11-22 | 2016-11-22 | Perforation air-ducting ring, air-conditioner outdoor unit and air-conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110211560A (en) * | 2019-05-31 | 2019-09-06 | 广东美的制冷设备有限公司 | Resonance sound-absorbing structure and air-conditioning draught fan component |
-
2016
- 2016-11-22 CN CN201621270615.7U patent/CN206207692U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110211560A (en) * | 2019-05-31 | 2019-09-06 | 广东美的制冷设备有限公司 | Resonance sound-absorbing structure and air-conditioning draught fan component |
| CN110211560B (en) * | 2019-05-31 | 2022-02-08 | 广东美的制冷设备有限公司 | Resonance sound absorption structure and air conditioner fan subassembly |
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