US20110028080A1 - Back draft damper - Google Patents
Back draft damper Download PDFInfo
- Publication number
- US20110028080A1 US20110028080A1 US12/462,172 US46217209A US2011028080A1 US 20110028080 A1 US20110028080 A1 US 20110028080A1 US 46217209 A US46217209 A US 46217209A US 2011028080 A1 US2011028080 A1 US 2011028080A1
- Authority
- US
- United States
- Prior art keywords
- vanes
- damper
- shell
- center line
- vertical center
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000005484 gravity Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1413—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre using more than one tilting member, e.g. with several pivoting blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
Definitions
- the prior art gravity actuated dampers typically comprise several stacked side-by-side vanes which are mounted in a shell and rotate about horizontal axes. The rotational axes are typically near the leading edge of the vanes to maximize the effect of gravity on the vanes so that gravity causes the vanes to be fully closed when there is no positive airflow past them.
- the subject invention typically mounts the vanes of a back draft damper generally vertically in the shell but with their rotational axes being slightly offset from vertical so that a small amount of gravitational force acts on the vanes to make them rotate to their closed positions. As a result, a small amount of force is required to overcome this gravitational force and rotate the vanes to their fully opened positions. This means that the vanes will open more quickly and with less force than vanes that rotate about horizontal axes and be more fully open at lower airflow levels.
- FIG. 1 is a perspective view of a back draft damper embodying the subject invention.
- FIG. 2 is a cross sectional view taken on the line 2 - 2 of FIG. 1 .
- FIG. 3 is a cross sectional view taken on the line 3 - 3 of FIG. 1 .
- FIG. 4 is a cross sectional view of one of the vanes of the subject invention.
- FIG. 5 is a front elevation view of an alternative embodiment the damper.
- FIG. 6 is a detailed view of how the damper is rotatably mounted in the shell.
- FIG. 7 is a side elevation view of an alternate embodiment of the invention.
- FIG. 8 is a front elevation view of the embodiment shown in FIG. 7 .
- FIG. 9 is a front elevation view of another embodiment of the invention.
- FIG. 10 is a perspective view of yet another embodiment.
- a back draft damper comprises a shell 10 which defines a central opening 12 having an inlet 11 and an outlet 13 through which air passes.
- the shell is constructed to fit into a duct or passageway (not shown) through which air flows, or be placed immediately upstream or downstream of a fan unit (not shown).
- the size of the shell depends upon the size of the duct, passageway or fan unit. In the preferred embodiment illustrated, which is sized for fans in a multiple fan array, the shell is 27′′ ⁇ 27′′ and has a depth of 8′′.
- the shell is constructed of 16 gauge sheet metal and has a lip 14 located at its outlet which engages an optional egg crate flow straightener 16 .
- the shell 10 has a top 18 , bottom 19 and sides 20 .
- the shell can be rectangular, as shown in FIGS. 1 and 2 or elliptical as shown in FIG. 9 .
- the shell can be fabricated from many types of materials and have different dimensions based on the particular application.
- a plurality of vanes 22 extend between the top and bottom surfaces, 18 , 20 of the shell 10 .
- the vanes move between open positions, FIG. 1 and solid line in FIG. 2 , where air can flow substantially unimpeded through the central opening 12 , and closed positions, dashed line in FIG. 2 and FIG. 5 , where air cannot flow through the central opening.
- the vanes 22 have top ends and bottom ends, rounded leading edges 24 and sides 26 which converge to thinner trailing edges 28 resulting in a neutral aerodynamic shape which creates little drag due to air flowing over the vanes.
- the vanes have a width which is less than or equal to the depth of the shell and a length which is slightly less than the height of the shell.
- the vanes have a length of approximately 261 ⁇ 2 inches and a width of between 6 and 8 inches, and have a thickness of between 0.250 and 0.400 inches at their leading edge 24 and between 0.050 and 0.100 inches at their trailing edge 28 .
- the blades have a thickness of 0.320 inches at their leading edge and 0.086 inches at their trailing edge.
- the vanes preferably are formed from an aluminum extrusion and are hollow to reduce their weight. In the preferred embodiment described above the vanes weigh approximately 2 pounds each. Cylindrical openings 24 extend through the vanes at their leading edge, the center line of which acts as the axes 36 the vanes rotate about. The axes 36 are located close to the inlet 11 .
- the vanes 22 are rotatably mounted in the shell 10 such that their axes of rotation 36 are slightly offset front to back from the vertical at an angle A, with the tops of the vanes being closer to the inlet 11 than the bottoms of the vanes.
- the amount of offset depends on the size and weight of the vanes and the amount of airflow that will pass through the damper. The purpose of the offset is to cause gravity to rotate the vanes to their fully closed position when there is no positive airflow through the damper, much in the same manner that a refrigerator door closes.
- the offset should be as little as possible to obtain this result so that the vanes can rotate to their open positions quickly when there is any positive airflow through the shell. Moreover, it is desired to have the vanes become fully opened with as little airflow as possible.
- the angle of the offset should be quite small and in the embodiment described above is 1.6 degrees. In general the angle could be as low as 0.5 and probably would never exceed 46 degrees.
- the axes 36 of the vanes 22 can also be offset at an angle B from side-to-side with the tops of the vanes being closer to the vertical center line L of the shell than the bottoms of the vanes, FIG. 5 . This may help cause the vanes to rotate to their closed positions, particularly if one of the vanes rotates past being aligned with the airflow.
- the angle B of the side-by-side offset is similar to that of the angle A of front to back offset.
- the shell has a vertical center line L and a horizontal center line D and rather than offsetting the axes 36 of the vanes 22 relative to the shell 10 , the vertical center line L of the shell is offset from the vertical by angle A to create the offset of the axes 36 front to back.
- the horizontal center line D of the shell also may be offset from the horizontal by angle B to create the offset of the axes 36 from side to side.
- each bearing rotates in the shell 10 on bearings 38 .
- the outer race 40 of each bearing is press fit into an opening 42 in the shell and the inner race 44 is positioned on the shoulder 46 of a bolt 48 which fits into the circular opening in the vane.
- a bearing 38 is located at the top and bottom of each vane 22 .
- the bearing may be a ball bearing but other types of bearing and rotating techniques can be utilized.
- the vanes rotate independently of one another so that each vane is aligned with the localized direction of the air flowing over it. In most cases this means that most of the blades will be oriented at an oblique angle with their trailing edges being closer to the center of the shell than their leading edges.
- This, along with the axes 36 of the vanes being offset from vertical causes the vanes on one side of the shell to rotate clockwise as they rotate to toward their closed positions and the vanes on the other side of the shell to rotate counterclockwise as they rotate toward their closed positions.
- Preferable there are an even number of vanes 22 one half of which are located on each side of the vertical center line of the shell. In the embodiment illustrated there are six vanes and they slightly overlap when they are in their closed position to provide a seal between them.
- a plurality of the dampers 10 of the subject invention could be incorporated into a single shell 50 which is placed next to a fan array of the type disclosed in U.S. Pat. Nos. 7,137,775 and 7,727,468. While the embodiment illustrated is a 5 ⁇ 5 rectilinear array it can be made to mate with any type of fan array.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Flow Control Members (AREA)
Abstract
Description
- Large air handling systems often require back draft dampers to be placed at critical locations to prevent air from flowing in the direction opposite normal air flow when the fan that is creating the airflow is not operating. This is particularly true with multi-fan systems such as shown in Hopkins, U.S. Pat. Nos. 7,137,775 and 7,727,468. With multi-fan systems it is common to shut off one or more of the fans to allow the remaining fans to run at peak efficiency. When this occurs some air from the operating fans will flow back through the non-operating fans if the non-operating fans do not have back draft dampers.
- There basically are three types of back draft dampers: manual systems where a blank off plate or damper is deployed to prevent reverse airflow; remotely actuated dampers where actuators are used to close a damper; and gravity actuated dampers where the damper is opened by the pressure of air passing through it and is closed by the force of gravity acting on its vanes. The prior art gravity actuated dampers typically comprise several stacked side-by-side vanes which are mounted in a shell and rotate about horizontal axes. The rotational axes are typically near the leading edge of the vanes to maximize the effect of gravity on the vanes so that gravity causes the vanes to be fully closed when there is no positive airflow past them. However, the down side of this is that it takes a considerable amount of airflow to fully open the vanes and if the airflow is to low to fully open the vanes they will create excess drag and overall efficiency of the system is reduced. While the gravity effect on damper vanes that rotate about horizontal axes can be reduced by counter weighting the vanes in some manner, this adds to the cost and in many situations the counter weighting has to be customized.
- The subject invention typically mounts the vanes of a back draft damper generally vertically in the shell but with their rotational axes being slightly offset from vertical so that a small amount of gravitational force acts on the vanes to make them rotate to their closed positions. As a result, a small amount of force is required to overcome this gravitational force and rotate the vanes to their fully opened positions. This means that the vanes will open more quickly and with less force than vanes that rotate about horizontal axes and be more fully open at lower airflow levels.
- The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention taken in conjunction with the accompanying drawings.
-
FIG. 1 is a perspective view of a back draft damper embodying the subject invention. -
FIG. 2 is a cross sectional view taken on the line 2-2 ofFIG. 1 . -
FIG. 3 is a cross sectional view taken on the line 3-3 ofFIG. 1 . -
FIG. 4 is a cross sectional view of one of the vanes of the subject invention. -
FIG. 5 is a front elevation view of an alternative embodiment the damper. -
FIG. 6 is a detailed view of how the damper is rotatably mounted in the shell. -
FIG. 7 is a side elevation view of an alternate embodiment of the invention. -
FIG. 8 is a front elevation view of the embodiment shown inFIG. 7 . -
FIG. 9 is a front elevation view of another embodiment of the invention. -
FIG. 10 is a perspective view of yet another embodiment. - Referring to
FIG. 1 of the drawings, a back draft damper comprises ashell 10 which defines acentral opening 12 having aninlet 11 and anoutlet 13 through which air passes. The shell is constructed to fit into a duct or passageway (not shown) through which air flows, or be placed immediately upstream or downstream of a fan unit (not shown). The size of the shell depends upon the size of the duct, passageway or fan unit. In the preferred embodiment illustrated, which is sized for fans in a multiple fan array, the shell is 27″×27″ and has a depth of 8″. The shell is constructed of 16 gauge sheet metal and has alip 14 located at its outlet which engages an optional eggcrate flow straightener 16. Theshell 10 has atop 18,bottom 19 andsides 20. The shell can be rectangular, as shown inFIGS. 1 and 2 or elliptical as shown inFIG. 9 . The shell can be fabricated from many types of materials and have different dimensions based on the particular application. - A plurality of
vanes 22 extend between the top and bottom surfaces, 18, 20 of theshell 10. The vanes move between open positions,FIG. 1 and solid line inFIG. 2 , where air can flow substantially unimpeded through thecentral opening 12, and closed positions, dashed line inFIG. 2 andFIG. 5 , where air cannot flow through the central opening. Referring now also toFIG. 4 , thevanes 22 have top ends and bottom ends, rounded leadingedges 24 andsides 26 which converge to thinnertrailing edges 28 resulting in a neutral aerodynamic shape which creates little drag due to air flowing over the vanes. In the preferred embodiment referred to above, the vanes have a width which is less than or equal to the depth of the shell and a length which is slightly less than the height of the shell. With the 27×27×8 inch shell described above the vanes have a length of approximately 26½ inches and a width of between 6 and 8 inches, and have a thickness of between 0.250 and 0.400 inches at their leadingedge 24 and between 0.050 and 0.100 inches at theirtrailing edge 28. In a preferred embodiment the blades have a thickness of 0.320 inches at their leading edge and 0.086 inches at their trailing edge. The vanes preferably are formed from an aluminum extrusion and are hollow to reduce their weight. In the preferred embodiment described above the vanes weigh approximately 2 pounds each.Cylindrical openings 24 extend through the vanes at their leading edge, the center line of which acts as theaxes 36 the vanes rotate about. Theaxes 36 are located close to theinlet 11. The top and bottom portions of theopenings 34 are threaded. In the embodiment illustration inFIGS. 1 and 2 thevanes 22 are rotatably mounted in theshell 10 such that their axes ofrotation 36 are slightly offset front to back from the vertical at an angle A, with the tops of the vanes being closer to theinlet 11 than the bottoms of the vanes. The amount of offset depends on the size and weight of the vanes and the amount of airflow that will pass through the damper. The purpose of the offset is to cause gravity to rotate the vanes to their fully closed position when there is no positive airflow through the damper, much in the same manner that a refrigerator door closes. However, the offset should be as little as possible to obtain this result so that the vanes can rotate to their open positions quickly when there is any positive airflow through the shell. Moreover, it is desired to have the vanes become fully opened with as little airflow as possible. Thus the angle of the offset should be quite small and in the embodiment described above is 1.6 degrees. In general the angle could be as low as 0.5 and probably would never exceed 46 degrees. - If desired the
axes 36 of thevanes 22 can also be offset at an angle B from side-to-side with the tops of the vanes being closer to the vertical center line L of the shell than the bottoms of the vanes,FIG. 5 . This may help cause the vanes to rotate to their closed positions, particularly if one of the vanes rotates past being aligned with the airflow. The angle B of the side-by-side offset is similar to that of the angle A of front to back offset. - In the embodiment illustrated in
FIGS. 7 and 8 , the shell has a vertical center line L and a horizontal center line D and rather than offsetting theaxes 36 of thevanes 22 relative to theshell 10, the vertical center line L of the shell is offset from the vertical by angle A to create the offset of theaxes 36 front to back. The horizontal center line D of the shell also may be offset from the horizontal by angle B to create the offset of theaxes 36 from side to side. - Referring now to
FIG. 6 , the vanes rotate in theshell 10 onbearings 38. Theouter race 40 of each bearing is press fit into an opening 42 in the shell and the inner race 44 is positioned on theshoulder 46 of abolt 48 which fits into the circular opening in the vane. Abearing 38 is located at the top and bottom of eachvane 22. The bearing may be a ball bearing but other types of bearing and rotating techniques can be utilized. - Preferable the vanes rotate independently of one another so that each vane is aligned with the localized direction of the air flowing over it. In most cases this means that most of the blades will be oriented at an oblique angle with their trailing edges being closer to the center of the shell than their leading edges. This, along with the
axes 36 of the vanes being offset from vertical causes the vanes on one side of the shell to rotate clockwise as they rotate to toward their closed positions and the vanes on the other side of the shell to rotate counterclockwise as they rotate toward their closed positions. Preferable there are an even number ofvanes 22, one half of which are located on each side of the vertical center line of the shell. In the embodiment illustrated there are six vanes and they slightly overlap when they are in their closed position to provide a seal between them. - Referring now to
FIG. 10 a plurality of thedampers 10 of the subject invention could be incorporated into asingle shell 50 which is placed next to a fan array of the type disclosed in U.S. Pat. Nos. 7,137,775 and 7,727,468. While the embodiment illustrated is a 5×5 rectilinear array it can be made to mate with any type of fan array. - The terms and expressions which have been employed in the foregoing specification are used therein as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding equivalents of the features shown and described or portions thereof, it being recognized that the scope of the invention is defined and limited only by the claims which follow.
Claims (24)
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/462,172 US20110028080A1 (en) | 2009-07-29 | 2009-07-29 | Back draft damper |
US12/775,000 US20110028081A1 (en) | 2009-07-29 | 2010-05-06 | Back draft damper |
AU2010203125A AU2010203125B2 (en) | 2009-07-29 | 2010-07-21 | Back draft damper |
EP20100251304 EP2295883A3 (en) | 2009-07-29 | 2010-07-22 | Back draft damper |
CA2710739A CA2710739C (en) | 2009-07-29 | 2010-07-22 | Back draft damper |
PCT/US2010/042872 WO2011017012A2 (en) | 2009-07-29 | 2010-07-22 | Back draft damper |
MYPI2010003501A MY161049A (en) | 2009-07-29 | 2010-07-23 | Back draft damper |
MX2010008123A MX2010008123A (en) | 2009-07-29 | 2010-07-26 | Back draft damper. |
SG201005397-3A SG168503A1 (en) | 2009-07-29 | 2010-07-27 | Back draft damper |
SG2012039764A SG182142A1 (en) | 2009-07-29 | 2010-07-27 | Back draft damper |
KR1020100072270A KR101176519B1 (en) | 2009-07-29 | 2010-07-27 | Back draft damper |
CN2010102418606A CN102012083B (en) | 2009-07-29 | 2010-07-29 | Back draft damper |
CN2011104440149A CN102519127A (en) | 2009-07-29 | 2010-07-29 | Anti-backflow damper assembly and method of providing Anti-backflow damper assembly |
US13/672,300 US20130072103A1 (en) | 2009-07-29 | 2012-11-08 | Back draft damper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/462,172 US20110028080A1 (en) | 2009-07-29 | 2009-07-29 | Back draft damper |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/775,000 Continuation-In-Part US20110028081A1 (en) | 2009-07-29 | 2010-05-06 | Back draft damper |
Publications (1)
Publication Number | Publication Date |
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US20110028080A1 true US20110028080A1 (en) | 2011-02-03 |
Family
ID=43527475
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/462,172 Abandoned US20110028080A1 (en) | 2009-07-29 | 2009-07-29 | Back draft damper |
Country Status (1)
Country | Link |
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US (1) | US20110028080A1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110183600A1 (en) * | 2010-01-26 | 2011-07-28 | Ctb, Inc. | Air check valve system and method of mounting same |
US20150010391A1 (en) * | 2013-07-05 | 2015-01-08 | Hon Hai Precision Industry Co., Ltd. | Fan assembly and air shield apparatus |
WO2015083318A1 (en) * | 2013-12-06 | 2015-06-11 | オイレスEco株式会社 | Ventilation damper |
JP2016199074A (en) * | 2015-04-07 | 2016-12-01 | 日本プラスト株式会社 | Wind direction adjusting device of vehicle |
US9605868B2 (en) | 2013-03-14 | 2017-03-28 | Mitek Holdings, Inc. | Fan array backflow preventer |
WO2017062467A1 (en) * | 2015-10-06 | 2017-04-13 | Equinix, Inc. | Bimetallic damper device |
CN111425427A (en) * | 2020-03-31 | 2020-07-17 | 佛山市云米电器科技有限公司 | Method and system for distributing air outlet section length and computer readable storage medium |
CN112594911A (en) * | 2020-12-10 | 2021-04-02 | 大连海尔空调器有限公司 | Air conditioner, control method and air guide assembly |
US20210356142A1 (en) * | 2019-02-25 | 2021-11-18 | Gd Midea Air-Conditioning Equipment Co., Ltd. | Air conditioner indoor unit, air conditioner, and method for controlling air conditioner |
CN113915689A (en) * | 2021-10-18 | 2022-01-11 | 珠海格力电器股份有限公司 | Indoor unit, air conditioner and control method of indoor unit |
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US5845999A (en) * | 1991-12-09 | 1998-12-08 | Kearney; James F. | Sealed ball and roller bearings |
US6386826B1 (en) * | 1999-09-23 | 2002-05-14 | International Business Machines Corporation | Fan with self closing blades |
US6554698B2 (en) * | 2000-12-05 | 2003-04-29 | Marconi Communications, Inc. | Fan one way air valve |
US6953320B1 (en) * | 2000-01-03 | 2005-10-11 | Munters Corporation | Ventilation fan |
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2009
- 2009-07-29 US US12/462,172 patent/US20110028080A1/en not_active Abandoned
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US2140279A (en) * | 1931-04-23 | 1938-12-13 | Foster Wheeler Corp | Heat exchange apparatus |
US5845999A (en) * | 1991-12-09 | 1998-12-08 | Kearney; James F. | Sealed ball and roller bearings |
US6386826B1 (en) * | 1999-09-23 | 2002-05-14 | International Business Machines Corporation | Fan with self closing blades |
US6953320B1 (en) * | 2000-01-03 | 2005-10-11 | Munters Corporation | Ventilation fan |
US6554698B2 (en) * | 2000-12-05 | 2003-04-29 | Marconi Communications, Inc. | Fan one way air valve |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110183600A1 (en) * | 2010-01-26 | 2011-07-28 | Ctb, Inc. | Air check valve system and method of mounting same |
US9612028B2 (en) * | 2010-01-26 | 2017-04-04 | Ctb, Inc. | Air check valve system and method of mounting same |
US9605868B2 (en) | 2013-03-14 | 2017-03-28 | Mitek Holdings, Inc. | Fan array backflow preventer |
US20150010391A1 (en) * | 2013-07-05 | 2015-01-08 | Hon Hai Precision Industry Co., Ltd. | Fan assembly and air shield apparatus |
WO2015083318A1 (en) * | 2013-12-06 | 2015-06-11 | オイレスEco株式会社 | Ventilation damper |
JP2016199074A (en) * | 2015-04-07 | 2016-12-01 | 日本プラスト株式会社 | Wind direction adjusting device of vehicle |
WO2017062467A1 (en) * | 2015-10-06 | 2017-04-13 | Equinix, Inc. | Bimetallic damper device |
US20210356142A1 (en) * | 2019-02-25 | 2021-11-18 | Gd Midea Air-Conditioning Equipment Co., Ltd. | Air conditioner indoor unit, air conditioner, and method for controlling air conditioner |
US11635213B2 (en) * | 2019-02-25 | 2023-04-25 | Gd Midea Air-Conditioning Equipment Co., Ltd. | Air conditioner indoor unit, air conditioner, and method for controlling air conditioner |
CN111425427A (en) * | 2020-03-31 | 2020-07-17 | 佛山市云米电器科技有限公司 | Method and system for distributing air outlet section length and computer readable storage medium |
CN112594911A (en) * | 2020-12-10 | 2021-04-02 | 大连海尔空调器有限公司 | Air conditioner, control method and air guide assembly |
CN113915689A (en) * | 2021-10-18 | 2022-01-11 | 珠海格力电器股份有限公司 | Indoor unit, air conditioner and control method of indoor unit |
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