EP0932801A1 - Air treatment apparatus - Google Patents
Air treatment apparatusInfo
- Publication number
- EP0932801A1 EP0932801A1 EP97944262A EP97944262A EP0932801A1 EP 0932801 A1 EP0932801 A1 EP 0932801A1 EP 97944262 A EP97944262 A EP 97944262A EP 97944262 A EP97944262 A EP 97944262A EP 0932801 A1 EP0932801 A1 EP 0932801A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- fan
- guide means
- treatment apparatus
- house
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/424—Double entry casings
-
- 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
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/081—Air-flow control members, e.g. louvres, grilles, flaps or guide plates for guiding air around a curve
Definitions
- the present invention relates to an air treatment apparatus of the type set forth in detail in the preamble of patent claim 1.
- radial fans particularly radial fans with double suction
- suck air from a large space i.e. when the fan inlet is not exposed to an adjacent wall or the like
- certain performances are achieved , which in this context are called nominal performances .
- the space from which the fan sucks air is limited , often quite limited, because an air treatment apparatus is not supposed to be wide open and/or bulky, need a lot of material when constructed etc .
- the performances of the fan then become impaired and these worse performances are called installation performances in this context.
- US-A-3 523 743 and SE-B-430 092 relate to fans having the above- mentioned defects but being provided with guide rails.
- a guide rail mounted on the outlet or pressure side of the impeller is designed to stabilize the air flow in the fan housing downstream the impeller.
- a rail guide is to a large extent mounted inside an impeller in order to bring about an alteration of the aerodynamics to make it match particularly well the requirements of an oil burner.
- the object of the present invention is to minimize the above- mentioned losses and consequently achieve improved fan performances and to reduce the noise generation of the fan.
- the inventor has discovered, that the phenomena, which result in the above-mentioned performance deterioration, are not only e g a general friction and turbulence, but a great part of the losses is caused by an exceptionally strong air rotation in front of or outside a fan inlet and this rotation is stronger the closer the inlet is positioned to an apparatus wall. Also, the inventor has discovered, that this rotation influences the functioning of the fan in a clearly negative manner, partly as regards the performances and partly as regards pulsations and noise.
- the inventor has found unexpectedly, when applying the above- mentioned insights, that guide means in more peripheral portions of the air space upstream the fan, namely actually outside the area, where more serious problems occur, result in evident im- provements. In this area the speeds are low and a possible tendency to rotation formation can be stopped more easily without the occurrence of appreciable pressure differences across said guide means with resulting loss-causing reliefs. Finally, the inventor has unexpectedly found, that a relatively insignificant control, i.e. of a smaller portion of the air flowing into the apparatus, results in the best total effect with only minimal losses and other inconveniences . In case the flow of air into the fan is symmetrical in all directions, said guide means ought to be radially disposed in order not to prevent the flow of air into the fan.
- the air substantially flows in one direction and the guide means then substantially ought to be disposed in this direction in order to not prevent the flow of air into the fan. Tests have shown, that the guide means will have the greatest action, provided they are positioned in the air space opposite the side, from which the air flows.
- the air rotation in front of a fan inlet is minimized and consequently the difference between the nominal performances of the fan and its installation performances is reduced in an inte- resting way. On an average the losses are halved. Also, the conditions of flow measurement are improved by means of the devices, which are described in SE-B-500 539.
- guide means according to the invention in the form of a relatively simple guide plate, which in an unexpectedly efficient way prevents the undesired rotation and which consequently markedly improves the performances , the speed and the noise level of the fan.
- Fig 1 is a partially cut open perspective view from the outlet side and from above of a conventional air treatment apparatus, the air flow into one of the fan inlets being indicated by an arrow ;
- Fig 2 shows the same apparatus in a perspective view from the inlet side and from above;
- Fig 3 is a view, which corresponds to Fig 1, of an air treatment apparatus according to the invention
- Fig 4 is a view, which corresponds to Fig 2, of an air treatment apparatus according to the invention
- Fig 5 is a diagram, which demonstrates the result of a comparison between three different tests .
- an air treatment apparatus is indicated in its entirety by 1. It includes a house 2 having a bottom wall 3, a top wall 4, a front wall 5, a rear wall 6 and lateral walls 7 and 8.
- the apparatus houses a fan 9, which e g is a double- action fan and is driven by a motor 10.
- the fan has one inlet 11, or two inlets if it is a double-suction fan, and an outlet 12 in rear wall 6.
- the inlet hole or possibly the inlet holes in the house, e g in the front wall can be shaped in various ways but is not shown for the sake of clarity.
- the space outside each fan inlet is indicated by 13 and the path of the air, which flows through this space, is illustrated by arrows 14 and 15 respectively.
- the air flows through space 13 in the form of substantially straight flow paths accor- ding to arrows 15, which paths merely adjacent the fan inlet are bent.
- guide means 16 preferably plane plates, which suitably have an at least mainly triangular shape, the small sides 17, 18 of the triangle contacting front wall 7 and matching lateral wall 8 re- spectively.
- the plate/plates is (are) positioned at least mainly in the same plane as fan shaft 19.
- small side 18 suitably extends roughly up to the projected extension of the fan shaft, whereas small side 17 extends roughly all the way up to the plane, within which the respective fan inlet is positioned.
- hypotenuse 20 of the triangle is positioned outside the greater part of space 13, seen in the direction from the fan.
- space 13 substantially escapes the guide means and consequently is freely available for installation and repair work, possibly measurement and other additional equipment etc. It is of course easy to mount the guide plates in a quick and interchangeable way respectively and even in a deformable way, e g by mounting two or more plates in the form of a laminate, which plates on top of each other can be mutually displaced.
- the guide plates of course do not have to have a triangular shape. They can have any shape and do not even have to be plane. They can have a transversal extension in relation to the plane, which goes through the fan shaft, particularly within the area for the respective inner corner in house 2, soft guiding zones being formed for the air streams along the apparatus walls . However, normally such special designs will not be required, since they do not result in more than marginal improvements . Guide plates having the shape shown in the drawings have proved to be unexpectedly efficient, which the diagram in Fig 5 also demonstrates.
- the unbroken line 21 represents an embodiment without lateral panels, namely without lateral walls 7 and 8, "the large room" thereby being symbolized.
- Line 22 with large dashes represents an embodiment having lateral walls and line 23 having small dashes represents an embodiment having lateral walls and guide means 16 according to the invention. As appears from the diagram the line with small dashes lies remarkably close to the unbroken line, which represents the ideal design.
- the invention is not limited to the embodiments described above and shown in the drawings but can be modified and supplemented in an arbitrary way within the scope of the inventive idea as defined in the following patent claims .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Ventilation (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9603640 | 1996-10-07 | ||
SE9603640A SE507274C2 (en) | 1996-10-07 | 1996-10-07 | Air treatment units comprising housing containing radial fan including plate means in the form of plate to prevent rotation of incoming air stream |
PCT/SE1997/001665 WO1998015785A1 (en) | 1996-10-07 | 1997-10-06 | Air treatment apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0932801A1 true EP0932801A1 (en) | 1999-08-04 |
EP0932801B1 EP0932801B1 (en) | 2003-04-09 |
Family
ID=20404138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97944262A Expired - Lifetime EP0932801B1 (en) | 1996-10-07 | 1997-10-06 | Air treatment apparatus |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0932801B1 (en) |
AU (1) | AU4579797A (en) |
DE (1) | DE69720752D1 (en) |
NO (1) | NO306524B1 (en) |
SE (1) | SE507274C2 (en) |
WO (1) | WO1998015785A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE513398C2 (en) * | 1999-01-13 | 2000-09-11 | Nivell System Ab | Air distribution device in a ventilation system |
US7108478B2 (en) * | 2003-06-13 | 2006-09-19 | American Standard International Inc. | Blower housing and cabinet with improved blower inlet airflow distribution |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3523743A (en) * | 1969-01-16 | 1970-08-11 | Brundage Co | Deflector for a centrifugal blower |
SE430092B (en) * | 1982-01-21 | 1983-10-17 | Lennart Wallman | DEVICE FOR RADIAL FLOWERS |
SE9001508D0 (en) * | 1990-04-26 | 1990-04-26 | Flaekt Ab | METHOD AND APPARATUS FOR STABILIZING THE PRESSURE OF A CENTRIFUGAL FAN |
-
1996
- 1996-10-07 SE SE9603640A patent/SE507274C2/en not_active IP Right Cessation
-
1997
- 1997-10-06 DE DE69720752T patent/DE69720752D1/en not_active Expired - Lifetime
- 1997-10-06 WO PCT/SE1997/001665 patent/WO1998015785A1/en active IP Right Grant
- 1997-10-06 AU AU45797/97A patent/AU4579797A/en not_active Abandoned
- 1997-10-06 EP EP97944262A patent/EP0932801B1/en not_active Expired - Lifetime
-
1999
- 1999-04-06 NO NO991611A patent/NO306524B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9815785A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69720752D1 (en) | 2003-05-15 |
NO306524B1 (en) | 1999-11-15 |
NO991611L (en) | 1999-04-06 |
SE9603640L (en) | 1998-04-08 |
AU4579797A (en) | 1998-05-05 |
SE9603640D0 (en) | 1996-10-07 |
WO1998015785A1 (en) | 1998-04-16 |
NO991611D0 (en) | 1999-04-06 |
EP0932801B1 (en) | 2003-04-09 |
SE507274C2 (en) | 1998-05-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5525036A (en) | Suction structure of a sirocco fan housing | |
US7048499B2 (en) | In-line centrifugal fan | |
EP1139033B1 (en) | Air conditioner | |
WO2011055594A1 (en) | Multiblade centrifugal fan and air conditioner using same | |
KR100285694B1 (en) | Flow stabilizer for transverse fan | |
JPH0387529A (en) | Air blower having once-through fan and air conditioner | |
US6953104B2 (en) | Muffin fan hush hood | |
US6254336B1 (en) | Sirocco fan having an inclined cutoff | |
KR20100041278A (en) | Centrifugal fan and air conditioner having the same | |
EP1375925B1 (en) | Centrifugal blower with cooling fin | |
EP0932801B1 (en) | Air treatment apparatus | |
JPH0396700A (en) | Air blower | |
JP3482231B2 (en) | Air volume adjustment device | |
WO2010125735A1 (en) | Ceiling-embedded ventilation fan | |
GB2334756A (en) | Fan unit with two fans, guide vanes and tapering duct | |
JPH09209994A (en) | Centrifugal type multiblade blower and ventilator using this | |
JPH08303393A (en) | Cross flow fan | |
KR200467395Y1 (en) | sirocco fan assembly | |
KR100322115B1 (en) | Outdoor unit for a split type air conditioner | |
KR200263351Y1 (en) | Multiblade fan | |
CN217602998U (en) | Air inlet device and fan assembly | |
KR102572942B1 (en) | Diffusion type guide vane | |
KR100621745B1 (en) | Volume Control System At Fan Impeller's Outlet by Throttle Mechanism | |
SU1413283A1 (en) | Diametric fan | |
KR100323520B1 (en) | Flow path structure for air conditioner |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19990326 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE DK FI GB LI NL |
|
17Q | First examination report despatched |
Effective date: 20011218 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): CH DE DK FI GB LI NL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030409 Ref country code: LI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030409 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030409 Ref country code: CH Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030409 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: FLAEKT WOODS AB |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030709 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20030710 |
|
NLT2 | Nl: modifications (of names), taken from the european patent patent bulletin |
Owner name: FLAEKT WOODS AB |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031006 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20040112 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20031006 |