CN103322619B - Air duct type air conditioning indoor machine - Google Patents
Air duct type air conditioning indoor machine Download PDFInfo
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- CN103322619B CN103322619B CN201310251415.1A CN201310251415A CN103322619B CN 103322619 B CN103322619 B CN 103322619B CN 201310251415 A CN201310251415 A CN 201310251415A CN 103322619 B CN103322619 B CN 103322619B
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- 238000004378 air conditioning Methods 0.000 title abstract description 11
- 238000005192 partition Methods 0.000 claims description 71
- 238000010521 absorption reaction Methods 0.000 claims description 32
- 230000000644 propagated effect Effects 0.000 description 9
- 239000011358 absorbing material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 241000886569 Cyprogenia stegaria Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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Abstract
The invention discloses a kind of air duct type air conditioning indoor machine, comprising: housing, cross flow fan, heat exchanger, sound absorbing layer, the first acoustical lining, the second acoustical lining; Housing comprises further: header board, rear plate, top board, base plate; Cross flow fan, heat exchanger, sound absorbing layer, the first acoustical lining and the second acoustical lining are built in housing, air channel is formed between air outlet and lower return air inlet, cross flow fan is arranged in lower return air inlet upper left air channel, be positioned at cross flow fan left air path, heat exchanger is set, be positioned at the surface attachment sound absorbing layer of the top board inwall on the right side of cross flow fan, and the first acoustical lining is being set at the top board inwall being positioned at upper left side, air port next time; Be positioned at the surface attachment sound absorbing layer of the plate inner wall on the right side of cross flow fan, and the plate inner wall under next-door neighbour on the left of return air inlet arranges described second acoustical lining.Application the present invention, can reduce air-conditioning noise, reduces airflow pressure losses in air channel, promote air-conditioner efficiency.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air duct type air conditioner indoor unit.
Background
The air pipe type air conditioner indoor unit can circulate by driving indoor air, so that indoor refrigeration or heating with higher efficiency is realized, and the air pipe type air conditioner indoor unit is mostly installed in places with higher requirements on indoor environment, such as hotels, schools, office buildings and the like. However, since the noise generated by the air duct type air conditioner indoor unit is likely to affect users when the air duct type air conditioner indoor unit is in operation, it is very important to reduce the noise generated by the air duct type air conditioner indoor unit by optimizing and improving equipment in the design of the air duct type air conditioner indoor unit.
The noise of the air duct type air conditioner indoor unit mainly comes from aerodynamic noise of a cross-flow fan, the cross-flow fan consisting of an impeller and a motor driving the impeller to rotate is usually positioned right above a lower return air inlet, when the air duct type air conditioner indoor unit operates in a lower return air mode, the noise is easily transmitted to the indoor through the lower return air inlet, the position of the lower return air inlet is simply deviated from the position right below the cross-flow fan, and no obvious noise reduction effect can be generated.
At present, the design of the air duct type air conditioner indoor unit mainly adopts a mode of increasing a plurality of groups of clapboards in a shell to reduce the noise of the air conditioner, for example, in a noise-proof ventilator of patent CN2336261Y, a mode of forming an S-shaped channel in the fan shell by utilizing a plurality of clapboards in a staggered manner is proposed to achieve the purpose of reducing the noise, but when the airflow passes through the shell provided with the plurality of groups of clapboards, serious airflow pressure loss is easily caused, for the cross flow fan of the air duct type air conditioner indoor unit with weak boosting capacity, the serious airflow pressure loss can influence the performance of the whole air conditioner, so that the air conditioning efficiency is not high.
Disclosure of Invention
The invention aims to provide an air duct type air conditioner indoor unit, which reduces air flow pressure loss in an air duct and improves air conditioning efficiency.
According to an aspect of an embodiment of the present invention, there is provided an air duct type air conditioning indoor unit including: the device comprises a shell, a cross flow fan, a heat exchanger, a sound absorption layer, a first sound absorption clapboard and a second sound absorption clapboard; the cross-flow fan is used for sucking partial indoor air through a lower air return opening formed in the shell and conveying the sucked indoor air to the heat exchanger; the heat exchanger is used for exchanging heat of indoor air conveyed by the cross flow fan and then sending the indoor air into a room through an air supply outlet formed in the shell; the sound absorption layer is attached to the surfaces of the first sound absorption partition plate, the second sound absorption partition plate and the inner wall of the shell and is used for absorbing part of noise generated by the operation of the cross flow fan; the first sound absorption partition plate is used for absorbing part of noise generated by the cross flow fan through the sound absorption layer attached to the surface and then reflecting the unabsorbed noise to the inner wall of the shell; and the second sound-absorbing partition plate is used for reflecting unabsorbed noise to the inner wall of the shell after the sound-absorbing layer attached to the surface absorbs part of noise generated by the cross-flow fan.
Preferably, the cross-flow fan, the heat exchanger, the sound absorbing layer, the first sound absorbing partition plate and the second sound absorbing partition plate are arranged in the casing, and an air duct is formed between the air supply opening and the lower air return opening.
Preferably, the housing further comprises: the front plate, the rear plate, the top plate and the bottom plate; the front plate forms the front part of the shell and is provided with the air supply outlet for supplying air to the indoor space; the rear plate forms the rear part of the shell, and the sound absorption layer is attached to the surface of the inner wall of the rear plate; the top plate forms the top of the shell, the sound absorption layer is attached to the surface of the inner wall of the top plate on the right side of the cross flow fan, and the first sound absorption partition plate is arranged on the inner wall of the top plate on the left upper side of the lower air return opening; the bottom plate forms the bottom of the shell, the lower air return opening is formed in the bottom plate, the sound absorbing layer is attached to the surface of the inner wall of the bottom plate on the right side of the cross-flow fan, and the second sound absorbing partition plate is arranged on the inner wall of the bottom plate close to the left side of the lower air return opening.
Preferably, the cross-flow fan is arranged in the left air duct above the lower air return inlet, and the heat exchanger is arranged in the left air duct of the cross-flow fan.
Preferably, the first sound-absorbing partition plate is obliquely arranged on the inner wall of the top plate, and the second sound-absorbing partition plate is obliquely arranged on the inner wall of the bottom plate.
Preferably, an included angle formed by the first sound-absorbing partition plate and the inner wall of the top plate is smaller than an included angle formed by the second sound-absorbing partition plate and the inner wall of the bottom plate.
Preferably, the included angle formed between the first sound-absorbing partition plate and the inner wall of the top plate is 140 degrees, and the included angle formed between the second sound-absorbing partition plate and the inner wall of the bottom plate is 150 to 160 degrees.
Preferably, the first sound absorbing partition plate is not less than 50mm away from the cross-flow fan in the placement direction, and the vertical distance between the rear plate and the cross-flow fan is not less than 200 mm.
Preferably, the ratio of the width of the lower air return opening to the height of the rear plate is greater than 0.55.
Therefore, according to the technical scheme of the embodiment of the invention, the sound-absorbing material is covered in the shell, the partition board which covers the sound-absorbing material is obliquely arranged on the top board, and the other partition board which also covers the sound-absorbing material is obliquely arranged on the bottom board, so that the noise of the air conditioner is reduced, the structure is simple, the air flow pressure loss in an air duct can be reduced, and the air conditioning efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of the invention and that other embodiments and drawings may be devised by those skilled in the art based on the exemplary embodiments shown in the drawings.
Fig. 1 is a schematic structural view of an air duct type air conditioner indoor unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
At present, the mode of arranging a plurality of groups of partition plates in a shell is generally adopted by the air duct type air conditioner indoor unit, the noise generated by a cross-flow fan is reduced, however, when the air duct type air conditioner indoor unit operates in a downward return air mode, the serious pressure loss can be caused when indoor air flow sucked into the shell passes through the multi-stage partition plates, and the performance of the whole air duct type air conditioner indoor unit can be influenced due to the serious pressure loss of the cross-flow fan with not very strong boosting capacity.
In the embodiment of the invention, the air duct type air conditioner indoor unit is provided, the noise of an air conditioner is reduced by covering the sound-absorbing material in the shell and arranging the two partition plates which are also covered with the sound-absorbing material, the structure is simple, the air flow pressure loss in an air duct can be reduced, and the air conditioning efficiency is improved.
Fig. 1 is a schematic structural view of an air duct type air conditioner indoor unit according to an embodiment of the present invention. Referring to fig. 1, comprising: a lower air return opening 101, a cross flow fan 102, a heat exchanger 103, an air supply opening 104, a sound absorbing layer 105, a first sound absorbing partition plate 106, a second sound absorbing partition plate 107, and a casing 108; wherein,
the cross-flow fan 102, the heat exchanger 103, the sound absorbing layer 105, the first sound absorbing partition 106 and the second sound absorbing partition 107 are arranged in a casing 108, the casing 108 is provided with a lower air return opening 101 and an air supply opening 104, and an air duct is formed between the air supply opening 104 and the lower air return opening 101.
And a cross flow fan 102, which is composed of an impeller and a motor for driving the impeller to rotate, for sucking a part of the indoor air through the lower air return opening 101 and delivering the sucked indoor air to the heat exchanger 103.
In the embodiment of the invention, the air pipe type air conditioner indoor unit operates in a downward return air mode, after the cross-flow fan 102 is started, indoor air is sucked through the downward return air inlet 101, the flow speed and the flow direction of the sucked indoor air are changed, the pressure of the sucked indoor air is increased, and then the sucked indoor air is conveyed to the heat exchanger 103.
The heat exchanger 103 exchanges heat with the indoor air blown by the cross flow fan 102, and sends the air into the room through the air outlet 104.
In an embodiment of the invention, the heat exchange comprises cooling or heating in the heat exchanger 103. After cooling or heating, the air is blown into the room through the air blowing port 104.
Indoor air is sucked by the cross flow fan 102, processed by the heat exchanger 103 and then sent into the room to circulate continuously, so as to achieve the effect of reducing or increasing the indoor temperature.
And a sound absorbing layer 105 made of a sound absorbing material attached to the surfaces of the first sound absorbing partition 106, the second sound absorbing partition 107, and the inner wall of the casing 108, for absorbing a part of noise generated by the operation of the cross flow fan 102.
In the embodiment of the present invention, the smooth airflow in the casing 108 is interrupted by the rotating blades in the cross flow fan 102, acceleration and velocity turning occur, so that the flow of the inlet region of the impeller is deteriorated to generate noise, and the noise sound waves are propagated in all directions in the casing 108 in a radial shape, and are partially absorbed by the sound absorption layer 105 when being propagated to the sound absorption layer 105, thereby attenuating the noise propagated to the room through the lower return air inlet 101.
The first sound absorption baffle 106 is used for reflecting unabsorbed noise to the inner wall of the shell 108 after absorbing part of noise generated by the cross flow fan 102 through the sound absorption layer 105 attached to the surface;
and a second sound-absorbing partition 107 for reflecting, after absorbing a part of the noise generated by the crossflow blower 102 by the sound-absorbing layer 105 attached to the surface thereof, the unabsorbed noise to the inner wall of the casing 108.
The housing 108 includes: front plate 108a, back plate 108b, top plate 108c, bottom plate 108 d. A front plate 108a forming the front part of the casing 108 and provided with an air supply port 104 for supplying air indoors; a rear plate 108b forming the rear part of the casing 108 and having a sound absorbing layer 105 attached to the surface of the inner wall thereof; a top plate 108c forming the top of the casing 108, wherein a sound absorbing layer 105 is attached to the surface of the inner wall of the top plate 108c positioned on the right side of the cross flow fan 102, and a first sound absorbing partition plate 106 is arranged on the inner wall of the top plate 108c positioned on the left upper side of the lower air return opening 101; and a bottom plate 108d forming the bottom of the casing 108, wherein a sound absorbing layer 105 is attached to the surface of the inner wall of the bottom plate 108d positioned on the right side of the cross flow fan 102, and a second sound absorbing partition plate 107 is provided on the inner wall of the bottom plate 108d positioned on the left side of the lower return air inlet 101.
Preferably, an air duct formed by a housing 108 is arranged between the lower air return opening 101 and the air supply opening 106, the cross flow fan 102 is arranged in the left air duct above the lower air return opening 101, the cross flow fan 102 is composed of an impeller and a motor driving the impeller to rotate, a heat exchanger 103 for cooling or heating air is arranged in the left air duct of the cross flow fan 102, a first sound absorption partition plate 106 is arranged on the inner wall of a top plate 108c positioned on the left upper side of the lower air return opening 101, the first sound absorption partition plate 106 is arranged in an inclined manner, an obtuse angle formed by the first sound absorption partition plate 106 and the inner wall of the top plate 108c is alpha, and the sound insulation layer 105 is attached to the surface of the inner wall. A second sound absorbing partition plate 107 is provided on the inner wall of the bottom plate 108d on the left side of the lower air return opening 101, the second sound absorbing partition plate 107 is disposed obliquely so that an obtuse angle β with the inner wall of the bottom plate 108d is formed, and the soundproof layer 105 is attached to the surface of the inner wall of the bottom plate 108 d.
Further, an obtuse angle α formed by the first sound-absorbing partition 106 and the inner wall of the top plate 108C, an obtuse angle β formed by the second sound-absorbing partition 107 and the inner wall of the bottom plate 108d, a distance a between the first sound-absorbing partition 106 and the cross-flow fan 102 along the placement direction, a ratio Q between a width C of the lower return air inlet 101 and a height H of the rear plate 108B, and a vertical distance B between the rear plate 108B and the cross-flow fan 102 all affect the noise reduction effect of the air duct type air conditioner indoor unit, the air intake amount of the cross-flow fan 102, and the pressure loss of the air flow in the air duct.
The distance A between the first sound-absorbing partition 106 and the cross-flow fan 102 along the placement direction and the vertical distance B between the rear plate 108B and the cross-flow fan 102 mainly influence the noise reduction effect; the obtuse angle alpha formed by the first sound-absorbing partition 106 and the inner wall of the top plate 108c and the obtuse angle beta formed by the second sound-absorbing partition 107 and the inner wall of the bottom plate 108d influence the pressure loss of the air flow in the air duct; the ratio Q of the width C of the lower return air inlet 101 to the height H of the rear plate 108b influences the intake amount of the cross-flow fan 102.
In practical application, by performing a comparison experiment for adjusting the above parameter values and testing the influence of the parameter values on the noise of the air duct type air conditioner indoor unit, the air intake of the cross-flow fan 102 and the pressure loss of the air flow in the air duct, a specific value of a set of optimal parameters can be obtained to ensure that when the first sound-absorbing partition plate 106 is inclined with the inner wall of the top plate 108c at an angle α and the second sound-absorbing partition plate 107 is inclined with the inner wall of the bottom plate 108d at an angle β, the pressure loss of the air flow in the air duct is small while the first sound-absorbing partition plate 106 and the second sound-absorbing partition plate 107 effectively absorb the noise sound wave. For example, when the ratio of the width C of the lower air return opening 101 to the height H of the rear plate 108B is an optimized Q value, the influence on the intake air amount of the cross-flow fan 102 is small, and when the distance between the first sound absorbing barrier 106 and the cross-flow fan 102 in the placement direction is an optimized a and the vertical distance between the rear plate 108B and the cross-flow fan 102 is an optimized B, the sound absorbing layer 105 can effectively absorb the noise sound wave generated by the cross-flow fan 102.
Preferably, in the embodiment of the present invention, the obtuse angle α formed between the first sound-absorbing partition 106 and the inner wall of the top plate 108C is smaller than the obtuse angle β formed between the second sound-absorbing partition 107 and the inner wall of the bottom plate 108d, and α is about 140 degrees, β is in the range of 150 to 160 degrees, the shortest distance a between the first sound-absorbing partition 106 and the cross-flow fan 102 is not less than 50mm, the perpendicular distance B between the rear plate 108B and the cross-flow fan 102 exceeds 200mm, and the ratio Q between the width C of the air return opening 101 and the height H of the rear plate 108B is not less than 0.55, with the above arrangement, since the sound-absorbing partitions are only arranged on the upper and lower sides of the inner wall of the casing, the air flow pressure loss in the air duct of the air duct type air conditioning indoor unit is small, the influence on the intake volume of the cross-flow fan 102 is small, so that the cross-flow fan of the air conditioning indoor unit with no, the air conditioning efficiency is effectively improved; meanwhile, the sound absorbing layer is attached to the inner wall of the casing and the sound absorbing partition plate, so that noise generated by the cross flow fan 102 can be effectively reduced.
The working principle of the air duct type air conditioner indoor unit of the embodiment of the invention is as follows: the air conditioner operates in a down-return mode, a motor in the cross-flow fan 102 drives an impeller to rotate, indoor air is sucked from an inlet area of the impeller through a down-return air inlet 101, the flow speed and the flow direction of the sucked indoor air are changed, the pressure of the sucked indoor air is increased, the sucked indoor air is conveyed to a heat exchanger 103 positioned on the left side of the cross-flow fan 102, and the heat exchanger 103 exchanges heat with the indoor air conveyed by the cross-flow fan 102 and then conveys the indoor air into a room through an air supply outlet 104. Meanwhile, noise sound waves generated during the operation of the crossflow blower 102 are radially propagated in the casing 108 in all directions, wherein a noise sound wave portion propagated to the top plate 108c is absorbed by the sound absorbing layer 105 attached to the surface of the inner wall of the top plate 108c, a noise sound wave portion propagated to the rear plate 108b is absorbed by the sound absorbing layer 105 attached to the surface of the inner wall of the rear plate 108b, a noise sound wave portion propagated to the bottom plate 108d is absorbed by the sound absorbing layer 105 attached to the surface of the inner wall of the bottom plate 108d, a noise sound wave portion propagated to the first partition 106 is absorbed by the sound absorbing layer 105 attached to the surface of the first partition 106, unabsorbed noise sound waves are reflected to the inner wall of the casing 108 by the first partition 106, a noise sound wave portion propagated to the second partition 107 is absorbed by the sound absorbing layer 105 attached to the surface of the second partition 107, and unabsorbed noise sound waves are reflected to the inner wall of the casing 108 by the second partition 107, the first sound-absorbing partition 106 and the second sound-absorbing partition 107 are treated to reduce noise transmitted to the room through the lower air return opening 101.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An air duct type air conditioner indoor unit, comprising: the device comprises a shell, a cross flow fan, a heat exchanger, a sound absorption layer, a first sound absorption clapboard and a second sound absorption clapboard; wherein,
the cross flow fan is used for sucking partial indoor air through a lower air return port formed in the shell and conveying the sucked indoor air to the heat exchanger;
the heat exchanger is used for exchanging heat of indoor air conveyed by the cross-flow fan and then sending the indoor air into the room through an air supply outlet formed in the shell;
the sound absorption layer is attached to the surfaces of the first sound absorption partition plate, the second sound absorption partition plate and the inner wall of the shell and is used for absorbing part of noise generated by the operation of the cross flow fan;
the first sound absorption partition plate is used for reflecting unabsorbed noise to the inner wall of the shell after absorbing part of noise generated by the cross flow fan through the sound absorption layer attached to the surface;
the second sound-absorbing partition board is used for reflecting unabsorbed noise to the inner wall of the shell after absorbing part of noise generated by the cross flow fan through the sound-absorbing layer attached to the surface;
the first sound absorption clapboard is obliquely arranged on the inner wall of the top plate of the shell; the second sound-absorbing partition plate is obliquely arranged on the inner wall of the bottom plate of the shell; the included angle formed by the first sound-absorbing partition plate and the inner wall of the top plate is smaller than the included angle formed by the second sound-absorbing partition plate and the inner wall of the bottom plate.
2. The indoor unit of an air duct type air conditioner according to claim 1,
the cross-flow fan, the heat exchanger, the sound absorbing layer, the first sound absorbing partition plate and the second sound absorbing partition plate are arranged in the shell, and an air channel is formed between the air supply opening and the lower air return opening.
3. The indoor unit of an air duct type air conditioner according to claim 2, wherein the casing further comprises: a front plate, a back plate, a top plate and a bottom plate,
a front plate forming the front part of the housing and provided with the air supply outlet for supplying air to the indoor;
the rear plate forms the rear part of the shell, and a sound absorption layer is attached to the surface of the inner wall of the rear plate;
the top plate forms the top of the shell, a sound absorption layer is attached to the surface of the inner wall of the top plate on the right side of the cross flow fan, and the first sound absorption partition plate is arranged on the inner wall of the top plate on the left upper side of the lower air return inlet;
the bottom plate forms the bottom of the shell, the lower air return opening is formed in the bottom of the shell, the sound absorption layer is attached to the surface of the inner wall of the bottom plate on the right side of the cross flow fan, and the second sound absorption partition plate is arranged on the inner wall of the bottom plate close to the left side of the lower air return opening.
4. The indoor unit of an air duct type air conditioner according to claim 2,
the cross-flow fan is arranged in the left air duct above the lower air return inlet, and the heat exchanger is arranged in the left air duct of the cross-flow fan.
5. The indoor unit of an air duct type air conditioner as claimed in any one of claims 1 to 4, wherein an included angle formed between the first sound-absorbing partition plate and the inner wall of the top plate is 140 degrees, and an included angle formed between the second sound-absorbing partition plate and the inner wall of the bottom plate is 150 to 160 degrees.
6. The indoor unit of an air duct type air conditioner according to claim 3 or 4, wherein the first sound absorbing partition is spaced from the cross-flow fan by a distance of not less than 50mm in the placement direction, and the rear plate of the casing is spaced from the cross-flow fan by a perpendicular distance of not less than 200 mm.
7. The indoor unit of an air duct type air conditioner as claimed in claim 3 or 4, wherein a ratio of a width of the lower return air inlet to a height of the rear plate of the casing is greater than 0.55.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310251415.1A CN103322619B (en) | 2013-06-21 | 2013-06-21 | Air duct type air conditioning indoor machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310251415.1A CN103322619B (en) | 2013-06-21 | 2013-06-21 | Air duct type air conditioning indoor machine |
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| CN103322619A CN103322619A (en) | 2013-09-25 |
| CN103322619B true CN103322619B (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310251415.1A Active CN103322619B (en) | 2013-06-21 | 2013-06-21 | Air duct type air conditioning indoor machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104566626B (en) * | 2013-10-12 | 2018-05-15 | 珠海格力电器股份有限公司 | Air duct machine |
| CN105588192B (en) * | 2015-06-09 | 2019-01-22 | 青岛海信日立空调系统有限公司 | A kind of embedded air-conditioner indoor set |
| CN106968987A (en) * | 2017-04-12 | 2017-07-21 | 深圳市上羽科技有限公司 | A kind of special cross flow fan for radiating and noise being reduced of air-conditioning |
| CN107101353B (en) * | 2017-05-27 | 2022-08-26 | 远大洁净空气科技有限公司 | New fan of low noise |
| CN109720172A (en) * | 2017-10-27 | 2019-05-07 | 郑州宇通客车股份有限公司 | Air conditioning air outlet denoising structure |
| CN108132701B (en) * | 2018-01-26 | 2023-09-26 | 郑州云海信息技术有限公司 | Heat dissipation air duct with sound absorption and noise reduction functions |
| CN109386910B (en) * | 2018-11-26 | 2023-08-11 | 科希曼电器有限公司 | Low-noise outdoor heat exchange device of air source heat pump |
| CN110779094B (en) * | 2019-11-01 | 2023-05-02 | 珠海格力电器股份有限公司 | Air conditioner with rotatable filtering mechanism |
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| CN103322619A (en) | 2013-09-25 |
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