EP0184024B1 - Deflecting cowl - Google Patents
Deflecting cowl Download PDFInfo
- Publication number
- EP0184024B1 EP0184024B1 EP85114276A EP85114276A EP0184024B1 EP 0184024 B1 EP0184024 B1 EP 0184024B1 EP 85114276 A EP85114276 A EP 85114276A EP 85114276 A EP85114276 A EP 85114276A EP 0184024 B1 EP0184024 B1 EP 0184024B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inner body
- outer jacket
- outer casing
- channel
- cross
- 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
Links
- 239000012530 fluid Substances 0.000 claims 1
- 206010022000 influenza Diseases 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
- F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
- F23L17/14—Draining devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
- F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
Definitions
- the invention relates to a deflector hood for chimneys, in particular for the exhaust air lines of industrial suction systems for digestors or the like, consisting of an outer jacket located as an attachment to an outer jacket extending into an inflow and outflow opening and extending in the middle between two openings Exhaust air duct and an inner body held in the outer jacket and continuously widening from a base surface in the direction of the outflow opening, the interior space of which is open towards the outflow opening and is connected to the surroundings in the region of the base surface by means of a channel guided through the wall of the outer jacket.
- Deflector hoods of this type serve to prevent rainwater from entering the exhaust air duct and thus to protect it against the flow impairment caused by moisture ingress, which in conventional chimneys takes the form of a reduction in the suction draft or even undesirable sooting, in industrial exhaust air ducts, especially exhaust air ducts of digestors in the form of other, depending on the type of system different disturbances can occur.
- the known deflector hoods fulfill their intended task to the fullest satisfaction, but on the other hand represent obstacles that cause considerable flow resistance, which must be compensated for by maintaining a correspondingly increased exhaust gas temperature or a correspondingly increased fan output.
- a deflector hood of this type is known from DE-B-1 009383.
- the present invention has for its object to provide a deflector hood with a reduced flow resistance and the invention consists in that the inner body has a shape corresponding to the outer shell, widening to the middle level and then narrowing again to the outflow opening, that the between the outer jacket and the inner body enclosed annular space has a continuously increasing cross section from the inflow opening to the outflow opening.
- the invention provides a deflector hood with diffuser properties which opposes the flowing medium with a flow resistance which is substantially reduced in comparison with the known deflector hoods.
- the point of reversal at which the positive static pressure changes into a negative static pressure is still inside the hood, so that with the aid of the deflector hood according to the invention, it is essential compared to the known hoods more compact construction, a "pressure recovery" which improves the draft in the exhaust air duct is achieved.
- the (liquid) discharge led from the interior of the inner body through the outer wall of the outer jacket can originate from the side surface of the inner body and have wing shape.
- the base surface of the inner body pointing in the direction of the inflowing gases can be given a rounded, tapering and therefore aerodynamically favorable shape, and the (water) drainage channel can also be given a streamlined profile. In this way, as measurements have shown, reduced drag coefficients in the deflector hood can be achieved down to a value of 0.64 and below.
- the deflector hood shown in the drawing for the exhaust air ducting of a suction system for digestors consists of an outer jacket 3 widening from both outflow and inflow openings 1, 2 into a middle, lying between the openings plane A as an attachment to the exhaust air line and one in the outer jacket 3 held from the base 4 in the direction of the outflow opening 1 continuously widening inner body 5, the interior of which is open towards the outflow opening in the region of the base surface is connected to the surroundings by means of a channel 6 guided through the wall of the outer casing 3.
- the inner body 5 has a shape corresponding to the outer jacket 3, which widens in this way up to the middle plane A and then narrows again in the direction of the outflow opening 1, such that the annular space 7 enclosed between the outer jacket 3 and the inner body 5 has a shape different from the inflow opening 2 up to the outflow opening 1 has a continuously enlarging cross section. Goes marr. In this sense, assuming that the diameter of the inflow opening is 2194 mm and thus the cross section is 0.0295 m 2 , the ring channel has a cross section of 0.036 m 2 in plane B, a cross section of 0.037 m 2 in plane A and in plane C a cross section of 0.046 m 2 .
- the outflow opening 1 is 0.452 m2 with a diameter of 240 mm .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ventilation (AREA)
- Outer Garments And Coats (AREA)
Abstract
Description
Die Erfindung betrifft eine Deflektorhaube für Kamine, insbesondere für die Fortluftleitungen von industriellen Absaugeanlagen für Digestoren oder dergl., bestehend aus einem sich bis in eine zwischen einer Zuström- und Abströmöffnung befindenden und sich mittlere, zwischen beiden Öffnungen gelegene Ebene erweiternden Aussenmantel als Aufsatz auf eine Fortluftleitung und einem in den Aussenmantel gehaltenen, sich von einer Basisfläche in Richtung auf die Abströmöff- · nung kontinuierlich erweiternden Innenkörper, dessen gegen die Abströmöffnung offener Innenraum im Bereich der Basisfläche mittels eines durch die Wandung des Aussenmantels geführten Kanals mit der Umgebung verbunden ist.The invention relates to a deflector hood for chimneys, in particular for the exhaust air lines of industrial suction systems for digestors or the like, consisting of an outer jacket located as an attachment to an outer jacket extending into an inflow and outflow opening and extending in the middle between two openings Exhaust air duct and an inner body held in the outer jacket and continuously widening from a base surface in the direction of the outflow opening, the interior space of which is open towards the outflow opening and is connected to the surroundings in the region of the base surface by means of a channel guided through the wall of the outer jacket.
Deflektorhauben dieser Art dienen der Verhinderung des Eindringens von Regenwasser in die Fortluftleitung und damit zu dessen Schutz gegen die durch Feuchtigkeitszutritt verursachte Beeinträchtigung der Strömung, die in üblichen Kaminen etwa in Form einer Erniedrigung des Saugzuges oder gar einer unerwünschten Versottung, in industriellen Fortluftleitungen, insbesondere Fortluftleitungen von Digestoren in Form anderer, je nach Art der Anlage unterschiedlicher Störungen auftreten können. Die bekannten Deflektorhauben erfüllen insoweit die ihnen zugedachte Aufgabe zur vollsten Zufriedenheit, stellen jedoch auf der anderen Seite Hindernisse dar, die einen erheblichen Strömungswiderstand verursachen, der durch Erhaltung einer entsprechend erhöhten Abgastemperatur bzw. einer entsprechend erhöhten Ventilatorleistung ausgeglichen werden muss. Eine Deflektorhaube dieser Art ist aus der DE-B-1 009383 bekannt.Deflector hoods of this type serve to prevent rainwater from entering the exhaust air duct and thus to protect it against the flow impairment caused by moisture ingress, which in conventional chimneys takes the form of a reduction in the suction draft or even undesirable sooting, in industrial exhaust air ducts, especially exhaust air ducts of digestors in the form of other, depending on the type of system different disturbances can occur. In this respect, the known deflector hoods fulfill their intended task to the fullest satisfaction, but on the other hand represent obstacles that cause considerable flow resistance, which must be compensated for by maintaining a correspondingly increased exhaust gas temperature or a correspondingly increased fan output. A deflector hood of this type is known from DE-B-1 009383.
Der vorliegenden Erfindung liegt als Aufgabe die Schaffung einer Deflektorhaube mit einem verminderten Strömungswiderstand zugrunde und die Erfindung besteht darin, dass der Innenkörper eine dem Aussenmantel entsprechende, sich derart bis zu der mittleren Ebene erweiternde und sich anschliessend bis zur Abströmöffnung wiederum verengende Form besitzt, dass der zwischen dem Aussenmantel und dem Innenkörper eingeschlossene Ringraum einen sich vom Zuströmöffnung bis zum Abströmöffnung kontinuierlich vergrössernden Querschnitt aufweist.The present invention has for its object to provide a deflector hood with a reduced flow resistance and the invention consists in that the inner body has a shape corresponding to the outer shell, widening to the middle level and then narrowing again to the outflow opening, that the between the outer jacket and the inner body enclosed annular space has a continuously increasing cross section from the inflow opening to the outflow opening.
Durch die Erfindung ist eine Deflektorhaube mit Diffusoreigenschaften geschaffen, die dem strömenden Medium einen im Vergleich zu den bekannten Deflektorhauben wesentlich verminderten Strömungswiderstand entgegensetzt. Es haben im Gegenteil Untersuchungen ergeben, dass der bei der erfindungsgemässen Deflektorhaube der Umkehrpunkt, an dem der positive statische Druck in einen negativen statischen Druck übergeht, noch innerhalb der Haube liegt, so dass mit Hilfe der erfindungsgemässen Deflektorhaube bei -gegenüber den bekannten Hauben -wesentlich gedrungenerer Bauweise ein den Zug in der Fortluftleitung verbessernder «Druck-Rückgewinn» erzieltwird. In diesem Sinne ist etwa bei kalte Gase führenden Fortluftleitungen der Einsatz von wesentlich leistungsschwächeren Ventilatoren bzw. bei heisse Gase führenden Kaminen, beispielsweise Kaminen für Kesselanlagen die Regelung der Anlage auf eine erheblich niedrigere Abgastemperatur möglich. Es kann somit durch den Einsatz der erfindungsgemässen Deflektorhaube eine nennenswerte Energieeinsparung erzielt werden.The invention provides a deflector hood with diffuser properties which opposes the flowing medium with a flow resistance which is substantially reduced in comparison with the known deflector hoods. On the contrary, investigations have shown that in the deflector hood according to the invention the point of reversal at which the positive static pressure changes into a negative static pressure is still inside the hood, so that with the aid of the deflector hood according to the invention, it is essential compared to the known hoods more compact construction, a "pressure recovery" which improves the draft in the exhaust air duct is achieved. In this sense, it is possible, for example, for exhaust air ducts carrying cold gases to use significantly less powerful fans or, in the case of chimneys carrying hot gases, for example chimneys for boiler systems, to regulate the system to a significantly lower exhaust gas temperature. Significant energy savings can thus be achieved by using the deflector hood according to the invention.
In einer vorteilhaften Ausführungsform der Erfindung kann die von dem Innenraum des Innenkörpers durch die Aussenwandung des Aussenmantels geführte (Flüssigkeits-)Ableitung von der Seitenfläche des Innenkörpers ausgehen und Tragflächenform besitzen. Durch die Anstellung der Flüssigkeitsableitung an der Seitenfläche des Innenkörpers kann die in Richtung der zuströmenden Gase weisende Basisfläche des Innenkörpers eine abgerundetspitz zulaufende und damit strömungstechnisch günstige Form erhalten, wobei der (Wasser) -Ableitungskanal ebenfalls eine strömungsgünstige Profilierung erhalten kann. Es können auf diese Weise-wie Messungen ergeben haben - bis auf einen Wert von 0,64 und darunter verringerte Luftwiderstandsbeiwerte in der Deflektorhaube erzielt werden.In an advantageous embodiment of the invention, the (liquid) discharge led from the interior of the inner body through the outer wall of the outer jacket can originate from the side surface of the inner body and have wing shape. By adjusting the liquid discharge on the side surface of the inner body, the base surface of the inner body pointing in the direction of the inflowing gases can be given a rounded, tapering and therefore aerodynamically favorable shape, and the (water) drainage channel can also be given a streamlined profile. In this way, as measurements have shown, reduced drag coefficients in the deflector hood can be achieved down to a value of 0.64 and below.
Die Erfindung ist in der Zeichnung anhand eines Ausführungsbeispieles erläutert.The invention is explained in the drawing using an exemplary embodiment.
Die in der Zeichnung wiedergegebene Deflektorhaube für die Fortluftfeitung einer Absaugeanlage für Digestoren besteht aus einem sich von beiden Abström- und Zuströmöffnungen 1, 2 bis in eine mittlere, zwischen den Öffnungen gelegene Ebene A erweiternden Aussenmantel 3 als Aufsatz auf die Fortluftleitung und einem in dem Aussenmantel 3 gehaltenen, sich von der Basis 4 in Richtung auf die Abströmöffnung 1 kontinuierlich erweiternden innenkörper 5, dessen gegen die Abströmöffnung offener Innenraum im Bereich der Basisfläche mittels eines durch die Wandung des Aussenmantels 3 geführt Kanals 6 mit der Umgebung verbunden ist. Der Innenkörper 5 eine dem Aussenmantel 3 entsprechende, sich derart bis zu der mittleren Ebene A erweiternde und sich anschliessend in Richtung auf die Abströmöffnung 1 wiederum verengende Form besitzt, dass der zwischen dem Aussenmantel 3 und dem Innenkörper 5 eingeschlossene Ringraum 7 einen sich von der Zuströmöffnung 2 bis zur Abströmöffnung 1 kontinuierlich vergrössernden Querschnitt aufweist. Geht marr. in diesem Sinne davon aus, dass der Durchmesser der Zuströmöffnung 2194 mm und damit der Querschnitt 0,0295 m2 beträgt, so weist der Ringkanal in der Ebene B einen Querschnitt von 0,036 m2, in der Ebene A einen Querschnitt von 0,037 m2 und in der Ebene C einen Querschnitt von 0,046 m2 auf. Die Abströmöffnung 1 beträgt bei einem Durchmesser von 240 mm 0,452 m2. The deflector hood shown in the drawing for the exhaust air ducting of a suction system for digestors consists of an
Der aus dem Inneren des Innenkörpers durch die Wandung des Aussenmantels geführte, der Ableitung von aufgefangenem Regenwasser dienende Kanal 6 geht von der Seitenfläche und nicht zentral von der Spitze des Innenkörpers-wie bei den bekannten Ausführungen einer Deflektorhaube-aus und ist tragflächenartig gestaltet, so dass die Deflektorhaube insgesamt eine ausserordentlich strömungsgünstige Form aufweist und damit den aufströmenden Gasen nahezu keinen Strömungswiderstand entgegensetzt.The
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85114276T ATE32257T1 (en) | 1984-11-22 | 1985-11-08 | DEFLECTOR HOOD. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3442588 | 1984-11-22 | ||
DE19843442588 DE3442588A1 (en) | 1984-11-22 | 1984-11-22 | DEFLECTOR HOOD |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0184024A1 EP0184024A1 (en) | 1986-06-11 |
EP0184024B1 true EP0184024B1 (en) | 1988-01-27 |
Family
ID=6250878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85114276A Expired EP0184024B1 (en) | 1984-11-22 | 1985-11-08 | Deflecting cowl |
Country Status (5)
Country | Link |
---|---|
US (1) | US4655121A (en) |
EP (1) | EP0184024B1 (en) |
JP (2) | JPS61252427A (en) |
AT (1) | ATE32257T1 (en) |
DE (1) | DE3442588A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4127247C2 (en) * | 1991-08-17 | 1995-02-23 | Beck Klaus Lizenzverwaltung | Rain repellent diffuser hood |
NL1005472C2 (en) * | 1997-03-07 | 1998-09-18 | Muelink & Grol Bv | Cowl and flue for combustion chimney |
US20050159101A1 (en) * | 2004-01-20 | 2005-07-21 | Hrdina Terry L. | Pivotal direct drive motor for exhaust assembly |
US7682231B2 (en) * | 2004-01-20 | 2010-03-23 | Greenheck Fan Corporation | Exhaust fan assembly |
CA2493651C (en) * | 2004-01-20 | 2014-05-20 | Greenheck Fan Corporation | Exhaust fan assembly having a windband |
US7320636B2 (en) * | 2004-01-20 | 2008-01-22 | Greenheck Fan Corporation | Exhaust fan assembly having flexible coupling |
US7547249B2 (en) * | 2004-07-15 | 2009-06-16 | Greenheck Fan Corporation | Exhaust fan assembly having H-out nozzle |
US20070125361A1 (en) * | 2005-12-02 | 2007-06-07 | Black Bailey J Jr | Vent cap assembly |
US7458888B2 (en) * | 2007-02-27 | 2008-12-02 | Huta Robert M | Chimney termination cap |
US20100285730A1 (en) * | 2009-05-11 | 2010-11-11 | Minel Kupferberg | High velocity nozzle and windband assembly |
US11274825B2 (en) * | 2016-07-13 | 2022-03-15 | Uchicago Argonne, Llc | Passive and no-loss weather cap for protection of wind induced downdraft in sensitive exhaust systems |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US45403A (en) * | 1864-12-13 | Improved chimney-top | ||
US1097487A (en) * | 1913-10-21 | 1914-05-19 | Benjamin H Van Auken | Ventilating-cowl. |
US1986176A (en) * | 1933-03-18 | 1935-01-01 | Zwerling Harry | Ventilator |
DE812690C (en) * | 1949-03-22 | 1951-09-03 | Walther & Cie Ag | Chimney top |
FR1008110A (en) * | 1950-01-09 | 1952-05-14 | Chimney cap | |
DE1009383B (en) * | 1952-07-04 | 1957-05-29 | Barmer Eisen Und Blechwarenfab | Fixed ventilation attachment open on top |
DE1842397U (en) * | 1961-09-18 | 1961-11-30 | Erhard Muhr | ROOF FOR EXHAUST GASES. |
DE1863687U (en) * | 1962-10-13 | 1962-12-13 | Mestrup & Co | LIFTING EXHAUST HOOD. |
DE2607712A1 (en) * | 1976-02-25 | 1977-09-08 | Hans Schwarz Ohg | Fireplace waste air mixing hood - has internal shallow funnel within truncated conical hood for mixing |
NL7902095A (en) * | 1979-03-16 | 1980-09-18 | Willem Jacobus Kleijn | Chimney cowl concentric flow cones - permit constant passage between them, inner cone top having ejector surface |
-
1984
- 1984-11-22 DE DE19843442588 patent/DE3442588A1/en active Granted
-
1985
- 1985-11-08 AT AT85114276T patent/ATE32257T1/en not_active IP Right Cessation
- 1985-11-08 EP EP85114276A patent/EP0184024B1/en not_active Expired
- 1985-11-21 JP JP60259934A patent/JPS61252427A/en active Pending
- 1985-11-22 US US06/800,775 patent/US4655121A/en not_active Expired - Fee Related
-
1990
- 1990-11-05 JP JP1990116153U patent/JPH0379034U/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0184024A1 (en) | 1986-06-11 |
JPH0379034U (en) | 1991-08-12 |
DE3442588C2 (en) | 1992-05-21 |
DE3442588A1 (en) | 1986-05-22 |
JPS61252427A (en) | 1986-11-10 |
US4655121A (en) | 1987-04-07 |
ATE32257T1 (en) | 1988-02-15 |
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