CN111189127A - Noise elimination and sound insulation device for air conditioner outdoor unit - Google Patents
Noise elimination and sound insulation device for air conditioner outdoor unit Download PDFInfo
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- CN111189127A CN111189127A CN202010063078.3A CN202010063078A CN111189127A CN 111189127 A CN111189127 A CN 111189127A CN 202010063078 A CN202010063078 A CN 202010063078A CN 111189127 A CN111189127 A CN 111189127A
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- air conditioner
- air
- cover body
- space
- air inlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/40—Vibration or noise prevention at outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/56—Casing or covers of separate outdoor units, e.g. fan guards
- F24F1/58—Separate protective covers for outdoor units, e.g. solar guards, snow shields or camouflage
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Duct Arrangements (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention relates to the technical field of noise reduction of air conditioners, and particularly discloses a noise elimination and sound insulation device for an air conditioner outdoor unit, which comprises a cover body covered on the air conditioner outdoor unit, wherein the cover body is provided with an air inlet and an air outlet; the air inlet end of the first space is communicated with the air inlet of the cover body, and the air outlet end of the first space is communicated with the air inlet end of an air inlet grille of the air conditioner external unit; the air inlet end of the second space is communicated with the air outlet end of a cooling fan of an air conditioner external unit, and the air outlet end of the second space is communicated with the air outlet of the cover body; an air inlet silencing assembly is arranged in the first space, and an air outlet silencing assembly is arranged in the second space. This scheme is used for solving noise pollution that the outer machine operation of air conditioner brought among the prior art makes the sound environmental quality of people's life living decline, seriously influences the problem of people's normal sleep and rest.
Description
Technical Field
The invention relates to the technical field of air conditioner noise reduction, in particular to a noise elimination and sound insulation device for an air conditioner outdoor unit.
Background
With the continuous improvement of living standard of people, the requirements on the living of materials are higher and higher, for example, in order to adjust the temperature in a room, it has become a popular requirement for installing an air conditioner, the air conditioner needs to be equipped with an air conditioner external unit with a compressor, an air inlet grille and a heat dissipation fan (the air inlet grille of the air conditioner external unit is located at the back (i.e. the rear) of the air conditioner external unit, the heat dissipation fan of the air conditioner external unit is located at the front of the air conditioner external unit), when the air conditioner is started, the air conditioner external unit is started immediately (the compressor is started, the air is fed into the air inlet grille, the air is discharged from the cooling fan), the sound generated after the air conditioner external unit is started is larger, the quantity of air conditioners is large in places with dense population, the quantity of air conditioner external units is natural, a plurality of air conditioner external units can bring noise pollution when running simultaneously, the quality of the living and living sound environment of people is reduced, and the normal sleep and rest of people are seriously influenced.
Disclosure of Invention
The invention aims to provide a noise elimination and sound insulation device for an air conditioner outdoor unit, and aims to solve the problem of noise pollution caused by operation of the air conditioner outdoor unit in the prior art.
In order to achieve the above object, the basic scheme of the invention is as follows:
the noise elimination and sound insulation device for the air conditioner outdoor unit comprises a cover body covering the air conditioner outdoor unit, wherein an air inlet and an air outlet are formed in the cover body; the air inlet end of the first space is communicated with the air inlet of the cover body, and the air outlet end of the first space is communicated with the air inlet end of an air inlet grille of the air conditioner external unit; the air inlet end of the second space is communicated with the air outlet end of a cooling fan of an air conditioner external unit, and the air outlet end of the second space is communicated with the air outlet of the cover body; an air inlet silencing assembly is arranged in the first space, and an air outlet silencing assembly is arranged in the second space.
Compared with the technical principle and the beneficial effects in the prior art:
the technical principle is as follows: the air conditioner outer unit is fixedly supported through the outer unit support (the outer unit support is fixed on a wall body of a building through expansion screws), when the air conditioner outer unit is started, air flows to form air, the air enters a first space from an air inlet through the air inlet noise elimination assembly and then enters an air inlet grid of the air conditioner outer unit, hot air blown out from a cooling fan of the air conditioner outer unit enters a second space, and the hot air is discharged from an air outlet after passing through the air outlet noise elimination assembly.
The existence of air inlet noise elimination subassembly and air-out noise elimination subassembly makes air flow rate reduce in this scheme, and absorbs the sound that the air flow produced, therefore makes aerodynamic noise reduction. Meanwhile, the air conditioner external unit is integrally positioned in the cover body, and the cover body can play a role in blocking sound generated by the operation of the air conditioner external unit. In addition, when the air conditioner external unit operates, the cover body covers the air conditioner external unit completely, and the cover body divides the surrounding space of the air conditioner external unit into a first space and a second space which are separated from each other, so that the whole path of wind generated by air flow enters the first space in the cover body from the air inlet of the cover body, the wind enters the air inlet grille from the rear part of the air conditioner external unit from the first space, hot wind is blown into the second space from the cooling fan of the air conditioner external unit, the wind in the second space is discharged from the air outlet, and the position of the air inlet is lower than that of the air outlet, therefore, the whole path of the air flow is curved, the path of the air flow is prolonged, the air flow rate is reduced, the attenuation of noise generated during the air flow is improved, and the noise reduction is facilitated. Compared with the prior art, the scheme can separate and absorb noise from multiple aspects at the root position where the air conditioner external unit generates the noise, so that the attenuation of the sound is improved, the purposes of sound insulation and noise reduction are achieved, the sound generated by the air conditioner external unit is reduced to be diffused into the air, the sound environment quality of living and living of people is improved, and the air conditioner external unit is guaranteed not to influence normal sleeping and resting of people during operation.
Furthermore, the air inlet is far away from the air outlet, and the air inlet is lower than the air outlet.
Has the advantages that: after the air conditioner external unit is started, the wind entering the first space from the air inlet at the low position is natural wind, the wind passing through the air conditioner external unit is hot wind, the hot wind enters the second space and is discharged from the air outlet at the high position, the first space is separated from the second space, and the inlet (the air inlet) of the natural wind is far away from the outlet (the air outlet) of the hot wind, so that the wind entering the air conditioner external unit is not influenced by the hot wind discharged from the air conditioner external unit, and the condition that the air conditioner external unit is shut down due to the fact that the interior of the air conditioner external unit is overheated because the hot wind is sucked by the air conditioner external unit again. Furthermore, the cover body, the air inlet noise elimination assembly and the air outlet noise elimination assembly all comprise a shell and sound absorption materials positioned in the shell, and a plurality of through holes are formed in the shell.
Has the advantages that: the sound absorbing material has an absorbing effect on sound, and the shell with the through holes is equivalent to a micro-perforated plate, so that the noise generated by air flow is eliminated, and the purpose of silencing is achieved.
Further, air inlet noise elimination subassembly includes guide plate under a plurality of fixed connection in the cover body, and lower guide plate includes sound absorbing material in casing and the casing, guide plate is parallel to each other under a plurality of.
Has the advantages that: the noise reduction treatment is carried out on the wind entering the air conditioner external unit through a plurality of lower guide plates with noise reduction materials and porous shells, and the purpose of noise reduction is achieved.
In addition, a plurality of lower guide plates are parallel to each other, are equivalent to a plurality of separated guide cavities, so that the air entering the air conditioner external unit enters the air conditioner external unit after passing through the separated guide cavities, and compared with the guide plates without a plurality of parallel guide plates, the air conditioner external unit can avoid the resonance of the air before entering the air inlet grille of the air conditioner external unit, and further reduces the generation of aerodynamic noise.
Furthermore, air-out noise elimination subassembly includes a plurality of guide plate on fixed connection covers the internal, and a plurality of guide plate is parallel to each other on, goes up the guide plate structure and is the same with lower guide plate structure.
Has the advantages that: the air outlet noise elimination assembly is the same as the air inlet noise elimination assembly in structure, so that the noise elimination and sound insulation device for the air conditioner outdoor unit is simpler to process.
Furthermore, the bottom parts of the upper guide plate and the lower guide plate are provided with silencing cusps.
Has the advantages that: the silencing tip plays a role in guiding wind generated by air flow, so that the collision strength of air flow and the upper guide plate or the lower guide plate can be reduced, and the noise is further reduced.
Further, the lower guide plates are sequentially arranged from the rear part to the front part of the air conditioner external unit, and the tops of the lower guide plates are sequentially reduced from the rear part to the front part of the air conditioner external unit.
Has the advantages that: the lower guide plate with the sequentially reduced top heights enables the volume of a guide cavity for air to flow to be larger, and air flow rate is reduced as far as possible under the condition that natural wind required by operation of an air conditioner external unit is met, so that aerodynamic noise is reduced.
Furthermore, a plurality of the upper guide plates are sequentially arranged from the rear part to the front part of the air conditioner external unit, and the bottoms of the plurality of upper guide plates are sequentially reduced from the rear part to the front part of the air conditioner external unit.
Has the advantages that: the last guide plate that the bottom height reduced in proper order makes the outer machine exhaust of air conditioner hot-blast before discharging from the air outlet, must receive the water conservancy diversion and the hindrance of a plurality of guide plates of going up of highly different, is equivalent to further reducing hot-blast velocity of flow, reduces the noise that the air flow produced.
Further, the top of the cover body is provided with a rain-proof cap capable of covering the cover body.
Has the advantages that: the rain-proof cap covers the cover body, and the air conditioner external unit is positioned in the cover body, so that the air conditioner external unit is prevented from being directly exposed to wind, sunlight and rain, and the service life of the air conditioner external unit is prolonged.
Furthermore, an opening communicated with the second space is formed in the cover body, an access door is detachably connected to the cover body, and the access door can cover the opening; the access door can be dismantled and connect on the cover body, then when needs maintain the outer machine of air conditioner, can dismantle the access door to in the maintenance to the outer machine of air conditioner.
Drawings
FIG. 1 is an isometric view of a first embodiment of the invention;
FIG. 2 is a front view of the first embodiment of the present invention;
FIG. 3 is a left side cross-sectional view of a first embodiment of the present invention;
FIG. 4 is a cross-sectional view of a front side panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a lower baffle according to an embodiment of the present invention.
FIG. 6 is an isometric view of a second embodiment of the invention;
fig. 7 is a left side sectional view of a second embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the air conditioner comprises a cover body 1, an air inlet 11, an air outlet 12, a protective panel 13, a damping plate 14, centrifugal glass wool 15, glass cloth 16, a perforated plate 17, a right side plate 18, a front side plate 19, an access door 2, an upper partition plate 3, a lower partition plate 4, a first space 5, a second space 6, an air inlet noise elimination assembly 7, an air outlet noise elimination assembly 8, a lower guide plate 71, an upper guide plate 81, a noise elimination tip 9, a wall body 10, a rain-proof cap 20, an outer machine support 30, an air conditioner outer machine 40, an air inlet grille 401 and a cooling fan 402.
Example one
An embodiment substantially as described herein with reference to figures 1 to 5 of the accompanying drawings:
the noise elimination and sound insulation device for the air conditioner outdoor unit comprises a cover body 1 covering the air conditioner outdoor unit 40, wherein the cover body 1 is fixed on a wall body 10 provided with the air conditioner outdoor unit 40 through expansion screws, the upper end and the lower end of the cover body 1 are open, the lower end opening of the cover body 1 is an air inlet 11, and the upper end opening of the cover body 1 is an air outlet 12.
Combine fig. 4, the cover body 1 is the U type, the cover body 1 includes the left side board, right side board 18 and preceding curb plate 19, the left side board, right side board 18 and preceding curb plate 19 all include the casing, damping plate 14 and sound absorbing material, the casing includes dado 13 and takes the perforated plate 17 of a plurality of through-holes, perforated plate 17 is located U type cover body 1 inboard (also the perforated plate 17 is towards the outer machine 40 of air conditioner, dado 13 is located the casing outside, sound absorbing material is centrifugal glass wool 15, centrifugal glass wool 15 surface coating has glass cloth 16, damping plate 14 is located between sound absorbing material and the dado 13, damping plate 14 is pasted at dado 13 inboardly.
An upper partition plate 3 and a lower partition plate 4 are welded on a cover body 1 (the left ends of the upper partition plate 3 and the lower partition plate 4 are welded on the inner wall of a left side plate of the cover body 1, and the right ends of the upper partition plate 3 and the lower partition plate 4 are welded on the inner wall of a right side plate 18 of the cover body 1), the upper partition plate 3 is positioned at the top of an air conditioner outdoor unit 40, the lower partition plate 4 is positioned at the lower part of the air conditioner outdoor unit 40, the upper partition plate 3 and the lower partition plate 4 are both attached to the air conditioner outdoor unit 40, and the space around the air conditioner outdoor unit 40 is divided into a first space; the first space 5 comprises a rear space of the air conditioner outdoor unit 40 and a lower space of the air conditioner outdoor unit 40, the second space 6 comprises a front space and an upper space of the air conditioner outdoor unit 40, the first space 5 is communicated with the air inlet 11, the second space 6 is communicated with the air outlet 12, the air inlet silencing assembly 7 is arranged in the first space 5, and the air outlet silencing assembly 8 is arranged in the second space 6.
The air inlet silencing component 7 comprises a plurality of lower guide plates 71 which are distributed at equal intervals, the air outlet silencing component 8 comprises a plurality of upper guide plates 81 which are distributed at equal intervals, the upper guide plates 81 are structurally the same as the lower guide plates 71, the plurality of lower guide plates 71 are parallel to each other, and the plurality of upper guide plates 81 are parallel to each other.
The draw-in groove has all been seted up to the left side board of the cover body 1 and right side board 18 inboard, goes up the draw-in groove of the left side board of the cover body 1 of all blocking of the left end of guide plate 81 and lower guide plate 71, goes up the draw-in groove of the right side board 18 of the cover body 1 of all blocking of the right-hand member of guide plate 81 and lower guide plate 71, goes up the draw-in groove of guide plate 81, lower guide plate 71 and the left side board of the cover body 1, the right side.
With reference to fig. 3 and 5, each of the upper deflector 81 and the lower deflector 71 includes a housing and a sound-absorbing material, the housing is a perforated plate 17 with a plurality of through holes (the perforated plate 17 is the same as the perforated plate 17 of the cover body 1), the sound-absorbing material is located in the housing made of the perforated plate 17, the sound-absorbing material is centrifugal glass wool 15, and the surface of the centrifugal glass wool 15 is wrapped by glass cloth 16; the bottom of the upper guide plate 81 and the bottom of the lower guide plate 71 are welded with silencing cusps 9.
The tops of the lower guide plates 71 are sequentially lowered from left to right; the bottoms of the upper deflectors 81 are sequentially lowered from left to right.
There is rain-proof cap 20 at the cover body 1 top, rain-proof cap 20 passes through the fix with screw on the wall body 10 of installation outer machine 40 of air conditioner, can play the effect that hides wind and rain to outer machine 40 of air conditioner and the outdoor machine of air conditioner noise elimination noise insulation through rain-proof cap 20, be favorable to prolonging the life of the outer machine 40 of cover body 1 and air conditioner, can form the guide effect to the air-out with the cover body 1 again, avoid the direct upwards discharge behind the air-out noise elimination subassembly 8 of the outer machine 40 exhaust hot-blast of air conditioner, the route that the air flows has been prolonged, be favorable to the decay of sound.
The specific implementation process is as follows:
the air conditioner external unit 40 is fixedly supported by the external unit bracket 30 (the external unit bracket 30 is fixed on the wall 10 of the building by expansion screws), when the air conditioner external unit 40 is started, air flows to form wind, the wind enters the first space 5 from the air inlet 11 through the air inlet noise elimination assembly 7 and then enters the air inlet grille 401 of the air conditioner external unit 40, hot wind blown out from the heat dissipation fan 402 of the air conditioner external unit 40 enters the second space 6, and the hot wind passes through the air outlet noise elimination assembly 8 and then is discharged from the air outlet 12.
In the embodiment, the air flow rate is reduced due to the existence of the air inlet silencing component 7 and the air outlet silencing component 8, and the sound generated by the air flow is absorbed through the perforated plate 17 and the sound absorbing material; the lower guide plates 71 are parallel to each other, and the upper guide plates 81 are also parallel to each other, which is equivalent to forming a plurality of separated guide cavities, so that natural wind entering the air conditioner external unit 40 and hot wind blown out from the air conditioner external unit 40 need to flow through the plurality of separated guide cavities, resonance of the natural wind before entering the air conditioner external unit 40 can be avoided, resonance of the hot wind when being blown out from the air conditioner external unit 40 can also be avoided, and generation of aerodynamic noise can be reduced.
Meanwhile, the air conditioner external unit 40 is integrally positioned in the cover body 1, and the outer side of the cover body 1 is provided with the protective panel 13 without holes, so that the sound generated by the operation of the air conditioner external unit 40 can be blocked.
In addition, when the air conditioner outdoor unit 40 operates, the whole path of the wind generated by the air flow enters from the guide cavities among the lower guide plates 71 at the rear lower part of the air conditioner outdoor unit 40 and is discharged from the guide cavities among the upper guide plates 81 at the front upper part of the air conditioner outdoor unit 40, the whole path of the air flow is curved, the path of the air flow is prolonged, the air flow rate is reduced, the attenuation of noise generated during the air flow is improved, and the noise reduction is facilitated.
In conclusion, the embodiment can block and absorb noise from multiple directions at the source position of the noise emitted by the air conditioner external unit 40, so as to enhance the attenuation of sound, achieve the purpose of sound insulation and noise reduction, reduce the sound generated by the air conditioner external unit 40 from diffusing into the air, improve the quality of sound environment of living and living of people, and ensure that the normal sleep and rest of people are not affected by the operation of the air conditioner external unit 40.
In addition, after the air conditioner external unit 40 is started, the air entering the first space 5 from the air inlet 11 at the low position is natural air, and the air coming out after passing through the air conditioner external unit 40 is hot air, and the hot air enters the second space 6 and is discharged from the air outlet 12 at the high position, the first space 5 is separated from the second space 6, and the inlet (the air inlet 11) of the natural air is far away from the outlet (the air outlet 12) of the hot air, so that the air entering the air conditioner external unit 40 is not affected by the hot air discharged from the air conditioner external unit 40, and the condition that the air conditioner external unit 40 is shut down due to overheating inside of the air conditioner external unit 40 caused by the fact that the hot air is sucked by the air.
Example two
Embodiment two is as shown in fig. 6 and fig. 7, and embodiment two is improved on the basis of embodiment one, specifically: the opening has been seted up on the preceding curb plate 19 of the cover body 1, through screw fixedly connected with access door 2 on the cover body 1, access door 2 can cover the opening.
When the air conditioner outdoor unit 40 needs to be maintained, the air conditioner outdoor unit 40 can be maintained only by detaching the access door 2, the whole air conditioner outdoor unit is not required to be detached from the noise elimination and sound insulation device, and the maintenance convenience is guaranteed.
The access door 2 is installed on the front side plate 19 in the second embodiment, so as to conveniently overhaul the air conditioner external unit 40, and the access door 2 can also be installed on the left side plate or the right side plate 18, so as to further facilitate the overhaul of the air conditioner external unit 40, and the structure is the same as that of the access door 2 installed on the front side plate 19, and is not repeated here.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. Air conditioner is noise elimination noise insulation for outdoor machine, including the cover body of cover on the outer machine of air conditioner, its characterized in that: the cover body is provided with an air inlet and an air outlet; the air inlet end of the first space is communicated with the air inlet of the cover body, and the air outlet end of the first space is communicated with the air inlet end of an air inlet grille of the air conditioner external unit; the air inlet end of the second space is communicated with the air outlet end of a cooling fan of an air conditioner external unit, and the air outlet end of the second space is communicated with the air outlet of the cover body; an air inlet silencing assembly is arranged in the first space, and an air outlet silencing assembly is arranged in the second space.
2. The sound-deadening and insulating device for an outdoor unit of an air conditioner according to claim 1, wherein: the air inlet is far away from the air outlet, and the air inlet is lower than the air outlet.
3. The sound-deadening and insulating device for an outdoor unit of an air conditioner according to claim 1, wherein: the cover body, the air inlet noise elimination assembly and the air outlet noise elimination assembly all comprise a shell and sound absorption materials located in the shell, and a plurality of through holes are formed in the shell.
4. The sound-deadening and insulating device for an outdoor unit of an air conditioner according to claim 3, wherein: the air inlet noise elimination subassembly includes guide plate under a plurality of fixed connection in the cover body, and lower guide plate includes sound absorbing material in casing and the casing, guide plate is parallel to each other under a plurality of.
5. The sound-deadening and insulating device for an outdoor unit of an air conditioner according to claim 4, wherein: the air outlet noise elimination assembly comprises a plurality of upper guide plates fixedly connected in the cover body, the plurality of upper guide plates are parallel to each other, and the upper guide plate structure is the same as the lower guide plate structure.
6. The sound-deadening and insulating device for an outdoor unit of an air conditioner according to claim 5, wherein: the bottom parts of the upper guide plate and the lower guide plate are provided with silencing cusps.
7. The sound-deadening and insulating device for an outdoor unit of an air conditioner according to claim 4, wherein: the plurality of lower guide plates are sequentially arranged from the rear part to the front part of the air conditioner external unit, and the tops of the plurality of lower guide plates are sequentially reduced from the rear part to the front part of the air conditioner external unit.
8. The sound-deadening and insulating device for an outdoor unit of an air conditioner according to claim 4, wherein: the upper guide plates are sequentially arranged from the rear part to the front part of the air conditioner external unit, and the bottoms of the upper guide plates are sequentially reduced from the rear part to the front part of the air conditioner external unit.
9. The sound-deadening and insulating device for an outdoor unit of an air conditioner according to claim 1, wherein: the top of the cover body is provided with a rain-proof cap capable of covering the cover body.
10. The sound-deadening and insulating device for an outdoor unit of an air conditioner according to claim 1, wherein: the cover body is provided with an opening communicated with the second space, the cover body is detachably connected with an access door, and the access door can cover the opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010063078.3A CN111189127B (en) | 2020-01-20 | 2020-01-20 | Noise elimination and sound insulation device for air conditioner outdoor unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010063078.3A CN111189127B (en) | 2020-01-20 | 2020-01-20 | Noise elimination and sound insulation device for air conditioner outdoor unit |
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| CN111189127A true CN111189127A (en) | 2020-05-22 |
| CN111189127B CN111189127B (en) | 2021-06-01 |
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| CN202010063078.3A Active CN111189127B (en) | 2020-01-20 | 2020-01-20 | Noise elimination and sound insulation device for air conditioner outdoor unit |
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| NL2031756B1 (en) * | 2022-05-02 | 2023-11-13 | M & G Group Europe B V | Cover for an outdoor unit |
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| EP4015921A1 (en) * | 2020-12-18 | 2022-06-22 | Ambrava Holding B.V. | Insulating container for a heat exchanging outdoor unit |
| NL2027152B1 (en) * | 2020-12-18 | 2022-07-13 | Ambrava Holding B V | Insulating container for a heat exchanging outdoor unit |
| CN116576325A (en) * | 2023-07-13 | 2023-08-11 | 江苏华东正大空调设备有限公司 | Muffler for ventilating duct |
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| CN111189127B (en) | 2021-06-01 |
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