EP1039142A2 - Fan diffuser - Google Patents
Fan diffuser Download PDFInfo
- Publication number
- EP1039142A2 EP1039142A2 EP00660054A EP00660054A EP1039142A2 EP 1039142 A2 EP1039142 A2 EP 1039142A2 EP 00660054 A EP00660054 A EP 00660054A EP 00660054 A EP00660054 A EP 00660054A EP 1039142 A2 EP1039142 A2 EP 1039142A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- diffuser
- fan wheel
- arrangement
- blades
- fan
- 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
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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
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
- F04D29/444—Bladed diffusers
Definitions
- the invention relates to an arrangement in connection with a fan comprising a rotatable fan wheel and a diffuser arranged in connection with the fan wheel to convert kinetic energy generated by a high velocity of exhaust into static pressure.
- a diffuser arranged after a fan wheel in the direction of flow is to convert the dynamic pressure generated by a high velocity of exhaust of the fan wheel into static pressure. This can be achieved by lowering the high velocity of exhaust after the fan wheel by the diffuser.
- An object of the invention is to provide an arrangement to enable drawbacks of the prior art to be eliminated. This is achieved by an arrangement of the invention.
- the arrangement of the invention is characterized in that at least one of the side plates of the diffuser is arranged to overlap with the outer edge of the rim of the fan wheel.
- An advantage of the arrangement of the invention is mainly that it enables all the above-mentioned drawbacks to be substantially efficiently affected and a preferable result to be achieved.
- a further advantage of the invention is its simplicity, which means that the invention is inexpensive to manufacture and use.
- a still further advantage of the invention is its flexibility in use, whereby an arrangement of the invention can be preferably applied to different fans.
- Figure 1 schematically shows how a flow of a gaseous medium, such as air, behaves in a fan apparatus of the prior art.
- reference number 1 refers to a fan wheel and reference number 2 to a diffuser by which, as stated above, kinetic energy generated by a high velocity of exhaust is converted into static pressure.
- the fan wheel is rotated by an appropriate motor, such as an electric motor.
- the motor is not shown in the figure.
- the flow of air is indicated in Figure 1 by means of arrows, whereby the above-mentioned disturbing reflow is also clearly apparent.
- the solution of Figure 1 suffers from the disadvantages relating to the noise level, as stated above.
- Figure 2 schematically shows an arrangement of the invention.
- the same reference numbers have the same significance as in Figure 1.
- the direction of rotation of the fan wheel 1 has been indicated by arrow N.
- high and low flow rates of air which are used to describe the basis of operation of the diffuser, in other words the above-mentioned conversion of kinetic energy into static pressure, have also been denoted in Figure 2 by arrows NK and NM.
- Figure 2 further clearly shows blades 3 of the fan wheel and blades 4 located in a diffuser of the present embodiment, the blades 4 of the diffuser being arranged between two side plates 2a, 2b located at a distance from each other, as can be seen from Figures 3 to 5.
- At least one of the side plates 2a, 2b of the diffuser is arranged to overlap with the outer edge of the rim of the fan wheel 1.
- the above-mentioned essential feature of the invention is clearly apparent in Figure 2 wherein the outer rim of the fan wheel 1 is indicated in a dotted line and the edge of the side plate of the diffuser is indicated in a continuous line. This can also be clearly seen in Figure 3 to 5.
- the above-mentioned essential feature of the invention also becomes apparent in Figures 6 and 7. In Figures 3 to 5 and 6 and 7, the flow of air is schematically indicated by means of arrows.
- the above-described structure enables the harmful reflow mentioned earlier to be avoided and the problems related to the noise level to be mitigated.
- both side plates of the diffuser 2 are arranged to overlap with the outer edge of the rim of the fan wheel, as shown in Figures 3 to 6, for example.
- the invention can, however, also be applied such that only one of the sides of the diffuser overlaps with the rim of the fan wheel.
- Such an application is schematically shown in Figure 7 wherein only the side plate 2b of the diffuser is arranged to overlap with the outer edge of the rim of the fan wheel.
- the structure of Figure 7 yields a slightly poorer result than, for example, the arrangement of Figure 6, but the solution of Figure 7 is advantageous to installability since the diffuser can be a simple, uniform structure which can be installed in place from the side.
- the overlapping side plate can be either one of the side plates 2a, 2b in this application.
- the structure of the diffuser must be a structure which can be opened, for example.
- FIG 2 shows the blades 4 located in the diffuser that are constructed from straight parts.
- the straightness of the blades 4 is apparent in Figure 2.
- the straight blades 4 are an advantage in the manufacturing process.
- the blades 4 of the diffuser can be shaped in many different ways, as shown in Figures 3 to 5. In the application of Figure 3, sides 4a of the blades 4 of the diffuser facing the fan wheel are straight. In the applications of Figures 4 and 5, the sides of the blades 4 facing the fan wheel are bevelled.
- the sides 4a are sloped seen in the direction of incoming air such that the edge of the diffuser facing the front side plate 2a is located at a greater distance from the fan wheel 1 than the edge facing the side plate 2b located further back.
- the term "seen in the direction of incoming air” refers to the direction of the rotation axis of the fan wheel 1 seen from the side of the fan wherefrom air flows to the fan wheel. This direction is marked with arrows TS in Figures 3 to 5. The flow of air is indicated by arrows.
- the blades 4 are bevelled in an inverted manner compared with the application of Figure 5. The most preferable result is achieved with the application of Figure 5.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Elimination Of Static Electricity (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
- The invention relates to an arrangement in connection with a fan comprising a rotatable fan wheel and a diffuser arranged in connection with the fan wheel to convert kinetic energy generated by a high velocity of exhaust into static pressure.
- The above-mentioned arrangements are well-known today in connection with, for example, different fan applications used in air treatment. The purpose of a diffuser arranged after a fan wheel in the direction of flow is to convert the dynamic pressure generated by a high velocity of exhaust of the fan wheel into static pressure. This can be achieved by lowering the high velocity of exhaust after the fan wheel by the diffuser.
- Dimensioning of a diffuser is a widely-studied subject. Design and Operation of Centrifugal Axial-Flow and Cross-Flow Fans by B. Eck, a well-known study in the field, provides an example of the dimensioning of blades and passages of a diffuser. Designing the diffuser optimally, however, usually results in a blade having the shape of a logarithmic spiral, which is difficult and expensive to manufacture from sheet metal; consequently, manufacturing costs easily become too high. In order to reduce the manufacturing costs, an attempt has been made to restrict the number of the blades to be smaller than the optimal one, in which case, however, flow-technical characteristics suffer and the result is not the best possible one.
- It is also known in the field that the distance between a blade of the fan and the diffuser affects certain characteristics of the apparatus, noise in particular, such that when the distance is too short the noise level is high. The above-mentioned features are also disclosed in the study by B. Eck mentioned above. The distance also has a great effect on the disturbing reflow.
- An object of the invention is to provide an arrangement to enable drawbacks of the prior art to be eliminated. This is achieved by an arrangement of the invention. The arrangement of the invention is characterized in that at least one of the side plates of the diffuser is arranged to overlap with the outer edge of the rim of the fan wheel.
- An advantage of the arrangement of the invention is mainly that it enables all the above-mentioned drawbacks to be substantially efficiently affected and a preferable result to be achieved. A further advantage of the invention is its simplicity, which means that the invention is inexpensive to manufacture and use. A still further advantage of the invention is its flexibility in use, whereby an arrangement of the invention can be preferably applied to different fans.
- In the following, the invention will be described by means of the examples shown in the accompanying drawings, in which
- Figure 1 is a schematic view showing how a flow behaves in an apparatus of the prior art,
- Figure 2 is a schematic side view of an arrangement of the invention,
- Figure 3 is a schematic view of an embodiment of the arrangement of Figure 2 as seen from another direction,
- Figure 4 shows a second embodiment of the arrangement of Figure 2,
- Figure 5 shows a third embodiment of the arrangement of Figure 2,
- Figure 6 is a schematic view of an embodiment of a basic principle of the invention, and
- Figure 7 is a schematic view of a second embodiment of the basic principle of the invention.
-
- Figure 1 schematically shows how a flow of a gaseous medium, such as air, behaves in a fan apparatus of the prior art. In Figure 1,
reference number 1 refers to a fan wheel andreference number 2 to a diffuser by which, as stated above, kinetic energy generated by a high velocity of exhaust is converted into static pressure. The fan wheel is rotated by an appropriate motor, such as an electric motor. The motor is not shown in the figure. The flow of air is indicated in Figure 1 by means of arrows, whereby the above-mentioned disturbing reflow is also clearly apparent. In addition to the reflow, the solution of Figure 1 suffers from the disadvantages relating to the noise level, as stated above. - Figure 2 schematically shows an arrangement of the invention. In Figure 2, the same reference numbers have the same significance as in Figure 1. Furthermore, in Figure 2, the direction of rotation of the
fan wheel 1 has been indicated by arrow N. Furthermore, high and low flow rates of air, which are used to describe the basis of operation of the diffuser, in other words the above-mentioned conversion of kinetic energy into static pressure, have also been denoted in Figure 2 by arrows NK and NM. - Figure 2 further clearly shows
blades 3 of the fan wheel andblades 4 located in a diffuser of the present embodiment, theblades 4 of the diffuser being arranged between twoside plates 2a, 2b located at a distance from each other, as can be seen from Figures 3 to 5. - In accordance with the basic idea of the invention, at least one of the
side plates 2a, 2b of the diffuser is arranged to overlap with the outer edge of the rim of thefan wheel 1. The above-mentioned essential feature of the invention is clearly apparent in Figure 2 wherein the outer rim of thefan wheel 1 is indicated in a dotted line and the edge of the side plate of the diffuser is indicated in a continuous line. This can also be clearly seen in Figure 3 to 5. The above-mentioned essential feature of the invention also becomes apparent in Figures 6 and 7. In Figures 3 to 5 and 6 and 7, the flow of air is schematically indicated by means of arrows. The above-described structure enables the harmful reflow mentioned earlier to be avoided and the problems related to the noise level to be mitigated. - The best result is achieved in such a manner that both side plates of the
diffuser 2 are arranged to overlap with the outer edge of the rim of the fan wheel, as shown in Figures 3 to 6, for example. The invention can, however, also be applied such that only one of the sides of the diffuser overlaps with the rim of the fan wheel. Such an application is schematically shown in Figure 7 wherein only the side plate 2b of the diffuser is arranged to overlap with the outer edge of the rim of the fan wheel. The structure of Figure 7 yields a slightly poorer result than, for example, the arrangement of Figure 6, but the solution of Figure 7 is advantageous to installability since the diffuser can be a simple, uniform structure which can be installed in place from the side. The overlapping side plate can be either one of theside plates 2a, 2b in this application. In the case of Figure 6, the structure of the diffuser must be a structure which can be opened, for example. - The invention can be applied in connection with different diffuser solutions, as shown in Figures 2 to 5. Figure 2 shows the
blades 4 located in the diffuser that are constructed from straight parts. The straightness of theblades 4 is apparent in Figure 2. Thestraight blades 4 are an advantage in the manufacturing process. Theblades 4 of the diffuser can be shaped in many different ways, as shown in Figures 3 to 5. In the application of Figure 3,sides 4a of theblades 4 of the diffuser facing the fan wheel are straight. In the applications of Figures 4 and 5, the sides of theblades 4 facing the fan wheel are bevelled. In the application of Figure 5, thesides 4a are sloped seen in the direction of incoming air such that the edge of the diffuser facing thefront side plate 2a is located at a greater distance from thefan wheel 1 than the edge facing the side plate 2b located further back. The term "seen in the direction of incoming air" refers to the direction of the rotation axis of thefan wheel 1 seen from the side of the fan wherefrom air flows to the fan wheel. This direction is marked with arrows TS in Figures 3 to 5. The flow of air is indicated by arrows. In the application of Figure 4, theblades 4 are bevelled in an inverted manner compared with the application of Figure 5. The most preferable result is achieved with the application of Figure 5. - The examples disclosed above are by no means meant to restrict the invention but it can be freely modified within the scope of the claims. It is thus obvious that an arrangement of the invention or the details thereof do not necessarily have to be identical to those shown in the figures, but other solutions are also possible. For example, the number of the blades of the diffuser may vary, the type of the fan may be different, etc. The invention can also be applied to a bladeless diffuser, etc.
Claims (5)
- An arrangement in connection with a fan comprising a rotatable fan wheel (1) and a diffuser (2) arranged in connection with the fan wheel to convert kinetic energy generated by a high velocity of exhaust into static pressure, characterized in that at least one of the side plates (2a, 2b) of the diffuser (2) is arranged to overlap with the outer edge of the rim of the fan wheel (1).
- An arrangement as claimed in claim 1, characterized in that both side plates (2a, 2b) of the diffuser (2) are arranged to overlap with the outer edge of the rim of the fan wheel (1).
- An arrangement as claimed in claim 1 or 2, characterized in that blades (4) of the diffuser (2) are made from straight parts.
- An arrangement as claimed in claim 3, characterized in that the sides of the blades (4) of the diffuser (2) facing the fan wheel are bevelled.
- An arrangement as claimed in claim 4, characterized in that the sides of the blades (4) of the diffuser (2) are bevelled, as seen in the direction of incoming air, such that the edge of the diffuser (2) facing the front side plate (2a) is located at a greater distance from the fan wheel (1 ) than the edge facing the side plate (2b) located further back.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI990637 | 1999-03-22 | ||
FI990637A FI105946B (en) | 1999-03-22 | 1999-03-22 | Arrangements in connection with a fan |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1039142A2 true EP1039142A2 (en) | 2000-09-27 |
EP1039142A3 EP1039142A3 (en) | 2002-05-08 |
EP1039142B1 EP1039142B1 (en) | 2004-09-22 |
Family
ID=8554255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00660054A Expired - Lifetime EP1039142B1 (en) | 1999-03-22 | 2000-03-21 | Fan diffuser |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1039142B1 (en) |
AT (1) | ATE277287T1 (en) |
DE (1) | DE60013940T2 (en) |
FI (1) | FI105946B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1455094A1 (en) * | 2003-03-04 | 2004-09-08 | Ziehl-Abegg AG | Radial flow impeller |
RU183324U1 (en) * | 2017-12-29 | 2018-09-18 | федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский политехнический университет Петра Великого" (ФГАОУ ВО "СПбПУ") | Airless diffuser low flow centrifugal compressor stage |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2471174A (en) * | 1947-04-24 | 1949-05-24 | Clark Bros Co Inc | Centrifugal compressor stability means |
US2665841A (en) * | 1951-05-04 | 1954-01-12 | Allen Mcmeen J | Air circulator |
US3627440A (en) * | 1970-04-07 | 1971-12-14 | Westinghouse Electric Corp | Centrifugal fan |
JPS5853700A (en) * | 1981-09-25 | 1983-03-30 | Mitsubishi Heavy Ind Ltd | Diffuser of pump, etc. |
WO1998045601A1 (en) * | 1997-04-04 | 1998-10-15 | Bosch Automotive Systems Corporation | Centrifugal fan with flow control vanes |
US5841943A (en) * | 1997-04-25 | 1998-11-24 | Soundesign, Llc | Ducted flow hair dryer with multiple impellers |
-
1999
- 1999-03-22 FI FI990637A patent/FI105946B/en not_active IP Right Cessation
-
2000
- 2000-03-21 DE DE60013940T patent/DE60013940T2/en not_active Expired - Lifetime
- 2000-03-21 AT AT00660054T patent/ATE277287T1/en not_active IP Right Cessation
- 2000-03-21 EP EP00660054A patent/EP1039142B1/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2471174A (en) * | 1947-04-24 | 1949-05-24 | Clark Bros Co Inc | Centrifugal compressor stability means |
US2665841A (en) * | 1951-05-04 | 1954-01-12 | Allen Mcmeen J | Air circulator |
US3627440A (en) * | 1970-04-07 | 1971-12-14 | Westinghouse Electric Corp | Centrifugal fan |
JPS5853700A (en) * | 1981-09-25 | 1983-03-30 | Mitsubishi Heavy Ind Ltd | Diffuser of pump, etc. |
WO1998045601A1 (en) * | 1997-04-04 | 1998-10-15 | Bosch Automotive Systems Corporation | Centrifugal fan with flow control vanes |
US5841943A (en) * | 1997-04-25 | 1998-11-24 | Soundesign, Llc | Ducted flow hair dryer with multiple impellers |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 007, no. 141 (M-223), 21 June 1983 (1983-06-21) & JP 58 053700 A (MITSUBISHI JUKOGYO KK), 30 March 1983 (1983-03-30) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1455094A1 (en) * | 2003-03-04 | 2004-09-08 | Ziehl-Abegg AG | Radial flow impeller |
WO2004079201A1 (en) * | 2003-03-04 | 2004-09-16 | Ziehl-Abegg Ag | Radial fan wheel, fan unit, and radial fan arrangement |
CN100458178C (en) * | 2003-03-04 | 2009-02-04 | 施乐百有限公司 | Radial fan wheel, fan unit, and radial fan arrangement |
US9157452B2 (en) | 2003-03-04 | 2015-10-13 | Ziehl-Abegg Se | Radial fan wheel, fan unit and radial fan arrangement |
RU183324U1 (en) * | 2017-12-29 | 2018-09-18 | федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский политехнический университет Петра Великого" (ФГАОУ ВО "СПбПУ") | Airless diffuser low flow centrifugal compressor stage |
Also Published As
Publication number | Publication date |
---|---|
DE60013940D1 (en) | 2004-10-28 |
ATE277287T1 (en) | 2004-10-15 |
EP1039142B1 (en) | 2004-09-22 |
DE60013940T2 (en) | 2005-10-06 |
FI105946B (en) | 2000-10-31 |
EP1039142A3 (en) | 2002-05-08 |
FI990637A0 (en) | 1999-03-22 |
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