EP0884542B1 - Outdoor unit of air conditioner - Google Patents
Outdoor unit of air conditioner Download PDFInfo
- Publication number
- EP0884542B1 EP0884542B1 EP97911481A EP97911481A EP0884542B1 EP 0884542 B1 EP0884542 B1 EP 0884542B1 EP 97911481 A EP97911481 A EP 97911481A EP 97911481 A EP97911481 A EP 97911481A EP 0884542 B1 EP0884542 B1 EP 0884542B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grille
- outdoor unit
- crest
- saw
- air
- 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.)
- Expired - Lifetime
Links
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
- F24F13/082—Grilles, registers or guards
-
- 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
-
- 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
-
- 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
- F24F13/24—Means for preventing or suppressing noise
Definitions
- the present invention relates to an outdoor unit for air conditioners according to the preamble of claim 1.
- Such an outdoor unit is known for instance from US-A-4976115.
- an air outlet grille 2 on the front side is structured into a grid shape consisting of grille vanes 2a, 2a, ... for enhancement of the appearance (beauty) of an outdoor unit 1.
- the grille vanes 2a, 2a, ... of the air outlet grille 2 each have a cross section of a generally elliptical wing shape, for example, as shown in Figs. 8 and 9 (see, for example, Japanese Patent Laid-Open Publication HEI 5-93531).
- Such a wing-shaped cross section of the grille vane 2a, 2a, ... makes it possible to prevent the breakaway of air flow at a front edge portion 3a of the grille vane while suppressing low both interferential noise due to interference with the flow of air blown off from an impeller 42 via a fan guide 41 and breakaway noise due to the breakaway.
- the outdoor unit for air conditioners is characterized in that a front edge of wing-shaped grille vanes provided in an air outlet grille of an outdoor unit casing is formed into a sawtoothed structure.
- each crest of the sawtoothed portion makes it less likely that the flow in the front edge of the grille vanes breaks away, and also makes the handling during assembly safer. Furthermore, it has been confirmed that forming the height of each crest of the sawtoothed portion to a dimensional value of 0.05 to 0.25 times the length of vanes (chord length) or forming the crest-to-crest pitch of the sawtoothed portion to a dimensional value of 0.5 to 1.5 times the height of the crest itself improves the aforementioned functions particularly effectively.
- Figs. 1 and 2 show the vane structure of an air outlet grille of an outdoor unit for air conditioners according to an embodiment of the present invention.
- reference numeral 2a denotes grille vanes constituting a grid-shaped air outlet grille 2 of the outdoor unit 1 for air conditioners with an appearance configuration similar to that of Figs. 6 and 7 as described before.
- This grille vane 2a as shown in Fig. 2, has a cross section of a generally elliptical wing-shaped structure generally similar to that of the conventional one shown in Fig. 9 as a whole. However, its front edge portion 3a is formed into a sawtoothed portion 5 as shown in Fig. 1 over its entire lateral width.
- the sawtoothed portion 5 as shown in Fig. 2 has crests 5a, 5a, ... each formed at the tip into a rounded portion having a specified curvature across the front and rear faces.
- the crest height H from the bottom of troughs 5b, 5b, ... to the tip of the crests 5a, 5a, ... is 0.05 to 0.25 times the length (chord length) L of grille vane 2a
- the present invention is applied to grille vanes at the air outlet grille of an outdoor unit for air conditioners.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Flow Control Members (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
Description
- The present invention relates to an outdoor unit for air conditioners according to the preamble of claim 1. Such an outdoor unit is known for instance from US-A-4976115.
- Conventionally, in most outdoor units for air conditioners, for example as shown in Figs. 6 and 7, an
air outlet grille 2 on the front side is structured into a grid shape consisting ofgrille vanes grille vanes air outlet grille 2 each have a cross section of a generally elliptical wing shape, for example, as shown in Figs. 8 and 9 (see, for example, Japanese Patent Laid-Open Publication HEI 5-93531). - Such a wing-shaped cross section of the
grille vane front edge portion 3a of the grille vane while suppressing low both interferential noise due to interference with the flow of air blown off from animpeller 42 via afan guide 41 and breakaway noise due to the breakaway. - However, blown-off air that is actually blown off from the
impeller 42 via thefan guide 41 has strong turning components so that the blown-off air impinges on thegrille vane 2a at a specified angle as shown in Fig. 9, almost all over the grille surface of theair outlet grille 2 shown in Fig. 6. As a result, there would arise a large breakaway of air flow as shown in Fig. 9 on the rear side of the air that impinge on thegrille vane 2a at the specified angle , i.e., on the negative-pressure surface side, causing a large breakaway noise as a disadvantage. - It is an object of the present invention to provide an outdoor unit for air conditioners which includes an air outlet grille having grille vanes that allow the noise due to breakaway of blown-off air to be reduced by suppressing the breakaway on the negative-pressure surface side of blown-off air that impinges obliquely.
- In order to achieve the above object, the outdoor unit for air conditioners according to the present invention is characterized in that a front edge of wing-shaped grille vanes provided in an air outlet grille of an outdoor unit casing is formed into a sawtoothed structure.
- Thus, by forming the front edge of the grille vanes into a sawtoothed structure, there arise numerous small-scaled longitudinal eddies from troughs of the sawtoothed portion so that an air flow of high flow rate at places away from the negative-pressure surface of the grille vanes can be drawn near the negative-pressure surface of the grille vanes. As a result, the flow on the negative-pressure surface side of the grille vanes is unlikely to break away so that the breakaway noise can be reduced further than it could conventionally.
- Also, rounding the tip of each crest of the sawtoothed portion makes it less likely that the flow in the front edge of the grille vanes breaks away, and also makes the handling during assembly safer. Furthermore, it has been confirmed that forming the height of each crest of the sawtoothed portion to a dimensional value of 0.05 to 0.25 times the length of vanes (chord length) or forming the crest-to-crest pitch of the sawtoothed portion to a dimensional value of 0.5 to 1.5 times the height of the crest itself improves the aforementioned functions particularly effectively.
-
- Fig. 1 is an enlarged plan view showing the structure of the grille vane of an outdoor unit for air conditioners according to an embodiment of the present invention;
- Fig. 2 is a sectional view taken along the line II - II of Fig. 1;
- Fig. 3 is a graph showing the relationship between the ratio of crest height of the sawtoothed portion to grille vane length (H/L) in the grille vanes and the noise level;
- Fig. 4 is a graph showing the relationship between the ratio of crest-to-crest pitch to crest height of the sawtoothed portion in the grille vanes and the noise level;
- Fig. 5 is a graph showing the relationship between noise level and air flow rate of the grille vanes according to the embodiment of the present invention, in contrast to a prior art;
- Fig. 6 is a front view showing the structure of an outdoor unit for air conditioners and its air outlet grille according to the prior art;
- Fig. 7 is a sectional view taken along the line VII - VII of Fig. 6;
- Fig. 8 is a plan view of the grille vane in the air outlet grille of the prior-art outdoor unit; and
- Fig. 9 is a sectional view taken along the line IX - IX of Fig. 8.
-
- Figs. 1 and 2 show the vane structure of an air outlet grille of an outdoor unit for air conditioners according to an embodiment of the present invention.
- Referring to Figs. 1 and 2,
reference numeral 2a denotes grille vanes constituting a grid-shapedair outlet grille 2 of the outdoor unit 1 for air conditioners with an appearance configuration similar to that of Figs. 6 and 7 as described before. Thisgrille vane 2a, as shown in Fig. 2, has a cross section of a generally elliptical wing-shaped structure generally similar to that of the conventional one shown in Fig. 9 as a whole. However, itsfront edge portion 3a is formed into a sawtoothed portion 5 as shown in Fig. 1 over its entire lateral width. - Then, the sawtoothed portion 5 as shown in Fig. 2 has
crests troughs crests grille vane 2a, and the lateral array pitch S of thecrests troughs - Like this, with a sawtoothed structure of the
front edge portion 3a of thegrille vane 2a in view of reducing the breakaway of air flow on the negative-pressure surface side, which is the rear side with respect to the direction in which air impinges on thegrille vanes 2a in theair outlet grille 2, there arise small-scaled longitudinal eddies from thetroughs grille vanes 2a of theair outlet grille 2 can be drawn near the negative-pressure surface of thegrille vanes 2a, making it unlikely that the flow on the negative-pressure surface side breaks away. As a result, breakaway noise is reduced effectively in contrast with the conventional grille vanes. - To verify such functional effects, with the aforementioned numerical relationships (H/L = 0.05 - 0.25 or S/H = 0.5 - 1.5) adopted for the
grille vanes 2a independently of each other, actual measurement of the noise level on these grille vanes was carried out and their results are shown in Figs. 3 and 4. From these charts, it can be understood that in the range of H/L = 0.05 - 0.25 or S/H = 0.5 - 1.5, the noise level is particularly low, hence a high noise-reduction effect. - Further, noise level was measured with various grille vanes that fell within the above ranges of H/L and S/H, and their measured values are as shown in Fig. 5, in comparison with the noise level under the conventional grille vane structure shown in Figs. 6 to 9. From Fig. 5, it can be seen that the grille vanes of the structure according to the present embodiment are lower in noise level by approximately 0.7 dB, regardless of the air flow rate, producing a higher noise-reduction effect.
- As described above, according to the outdoor unit for air conditioners which adopts the grille vanes of the present invention, breakaway of air flow on the negative-pressure surface side of the grille vanes on which blown-off air impinges obliquely can be suppressed. As a result, noise due to the breakaway of air flow at the grille vanes can be reduced remarkably as compared with the prior art, so that improvement in the quietness performance of the outdoor unit for air conditioners can be achieved.
- The present invention is applied to grille vanes at the air outlet grille of an outdoor unit for air conditioners.
Claims (4)
- An outdoor unit for air conditioners having an outlet grille in an outdoor unit casing, characterized in that a sawtoothed portion (5) is formed in a front edge (3a) of wing-shaped grille vanes (2a) provided in the air outlet grille of the outdoor unit casing.
- The outdoor unit for air conditioners according to Claim 1, wherein each crest (5a) of the sawtoothed portion is rounded at its tip.
- The outdoor unit for air conditioners according to Claim 1 or 2, wherein height (H) of each crest of the sawtoothed portion is set to a size of 0.05 to 0.25 times the length (L) of each wing-shaped grille vane.
- The outdoor unit for air conditioners according to any one of Claims 1 to 3, wherein a crest-to-crest pitch of the sawtoothed portion is set to a size of 0.5 to 1.5 times the height (H) of the crest itself.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP335448/96 | 1996-12-16 | ||
JP33544896 | 1996-12-16 | ||
JP8335448A JP3052862B2 (en) | 1996-12-16 | 1996-12-16 | Outdoor unit for air conditioner |
PCT/JP1997/004059 WO1998027390A1 (en) | 1996-12-16 | 1997-11-07 | Outdoor unit of air conditioner |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0884542A1 EP0884542A1 (en) | 1998-12-16 |
EP0884542A4 EP0884542A4 (en) | 2000-03-29 |
EP0884542B1 true EP0884542B1 (en) | 2003-05-07 |
Family
ID=18288680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97911481A Expired - Lifetime EP0884542B1 (en) | 1996-12-16 | 1997-11-07 | Outdoor unit of air conditioner |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0884542B1 (en) |
JP (1) | JP3052862B2 (en) |
KR (1) | KR100453318B1 (en) |
CN (1) | CN1106545C (en) |
AU (1) | AU719177B2 (en) |
DE (1) | DE69721739T2 (en) |
ES (1) | ES2198557T3 (en) |
HK (1) | HK1016247A1 (en) |
ID (1) | ID21219A (en) |
PT (1) | PT884542E (en) |
SA (1) | SA97180747B1 (en) |
WO (1) | WO1998027390A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE533313C2 (en) * | 2008-12-22 | 2010-08-24 | Atlas Copco Rock Drills Ab | Cooling system intended for cooling at least one circulating fluid, and a machine comprising the cooling system |
ES2788099T3 (en) * | 2011-04-08 | 2020-10-20 | Trox Gmbh Geb | Device for influencing an air flow in a component of an air conditioning installation |
DE102012213930A1 (en) * | 2012-08-07 | 2014-02-13 | BSH Bosch und Siemens Hausgeräte GmbH | Blower with air inlet nozzle for swirling air flow and air inlet nozzle for a blower |
KR101435007B1 (en) * | 2013-04-22 | 2014-08-28 | 반석공조시스템(주) | Noise reduction Louver |
CN103292441B (en) * | 2013-06-25 | 2016-03-30 | 吉林大学 | Bionical noise reduction air conditioner grid |
KR101702169B1 (en) | 2013-10-02 | 2017-02-02 | 엘지전자 주식회사 | Indoor unit for cassette type air conditoiner |
KR101706812B1 (en) * | 2013-10-02 | 2017-02-14 | 엘지전자 주식회사 | Indoor unit for cassette type air conditoiner |
KR20150043573A (en) | 2013-10-11 | 2015-04-23 | 엘지전자 주식회사 | Indoor unit for cassette type air conditoiner |
KR101662377B1 (en) | 2014-01-27 | 2016-10-04 | 엘지전자 주식회사 | Indoor unit of air conditoiner |
CN105588231B (en) * | 2015-03-31 | 2019-07-23 | 青岛海信日立空调系统有限公司 | A kind of air-conditioner outdoor unit air exhausting structure |
KR101906844B1 (en) * | 2015-07-24 | 2018-10-11 | 코닌클리케 필립스 엔.브이. | Hair care device |
CN107388424A (en) * | 2017-08-04 | 2017-11-24 | 广东美的制冷设备有限公司 | Outlet housing and air-conditioner outdoor unit |
JP2019098878A (en) * | 2017-11-30 | 2019-06-24 | トヨタ自動車株式会社 | register |
JP2021080851A (en) * | 2019-11-15 | 2021-05-27 | 株式会社マキタ | Blower |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0267839U (en) * | 1988-11-07 | 1990-05-23 | ||
US4976115A (en) * | 1989-08-21 | 1990-12-11 | Carrier Corporation | Cambered condenser grill |
JP2516634Y2 (en) * | 1990-03-19 | 1996-11-06 | 松下冷機株式会社 | Blowout guider |
JP2953136B2 (en) * | 1991-10-01 | 1999-09-27 | 松下電器産業株式会社 | Front grill for outdoor unit of air conditioner |
JP3337248B2 (en) * | 1992-12-03 | 2002-10-21 | 三菱重工業株式会社 | Propeller fan |
JP3448136B2 (en) * | 1994-11-08 | 2003-09-16 | 三菱重工業株式会社 | Propeller fan |
JPH08313006A (en) * | 1995-05-17 | 1996-11-29 | Matsushita Electric Ind Co Ltd | Front grille for outdoor machine of air conditioner |
-
1996
- 1996-12-16 JP JP8335448A patent/JP3052862B2/en not_active Expired - Fee Related
-
1997
- 1997-11-07 AU AU48855/97A patent/AU719177B2/en not_active Ceased
- 1997-11-07 PT PT97911481T patent/PT884542E/en unknown
- 1997-11-07 ES ES97911481T patent/ES2198557T3/en not_active Expired - Lifetime
- 1997-11-07 WO PCT/JP1997/004059 patent/WO1998027390A1/en active IP Right Grant
- 1997-11-07 EP EP97911481A patent/EP0884542B1/en not_active Expired - Lifetime
- 1997-11-07 DE DE69721739T patent/DE69721739T2/en not_active Expired - Lifetime
- 1997-11-07 ID IDW980049D patent/ID21219A/en unknown
- 1997-11-07 CN CN97192322A patent/CN1106545C/en not_active Expired - Fee Related
- 1997-11-07 KR KR10-1998-0705673A patent/KR100453318B1/en not_active IP Right Cessation
- 1997-12-28 SA SA97180747A patent/SA97180747B1/en unknown
-
1999
- 1999-03-17 HK HK99101114A patent/HK1016247A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR19990081955A (en) | 1999-11-15 |
EP0884542A1 (en) | 1998-12-16 |
PT884542E (en) | 2003-09-30 |
ID21219A (en) | 1999-05-06 |
ES2198557T3 (en) | 2004-02-01 |
WO1998027390A1 (en) | 1998-06-25 |
SA97180747B1 (en) | 2006-08-12 |
KR100453318B1 (en) | 2004-12-31 |
AU4885597A (en) | 1998-07-15 |
DE69721739T2 (en) | 2004-02-05 |
CN1106545C (en) | 2003-04-23 |
HK1016247A1 (en) | 1999-10-29 |
JP3052862B2 (en) | 2000-06-19 |
CN1211311A (en) | 1999-03-17 |
DE69721739D1 (en) | 2003-06-12 |
JPH10176847A (en) | 1998-06-30 |
AU719177B2 (en) | 2000-05-04 |
EP0884542A4 (en) | 2000-03-29 |
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