EP0662587A2 - Chapeau de cheminée ou d'un conduit de ventilation - Google Patents

Chapeau de cheminée ou d'un conduit de ventilation Download PDF

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Publication number
EP0662587A2
EP0662587A2 EP94810758A EP94810758A EP0662587A2 EP 0662587 A2 EP0662587 A2 EP 0662587A2 EP 94810758 A EP94810758 A EP 94810758A EP 94810758 A EP94810758 A EP 94810758A EP 0662587 A2 EP0662587 A2 EP 0662587A2
Authority
EP
European Patent Office
Prior art keywords
chimney
shaped plate
range
disc
pipe
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.)
Withdrawn
Application number
EP94810758A
Other languages
German (de)
English (en)
Other versions
EP0662587A3 (fr
Inventor
Gert Basten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Basten Gert
Original Assignee
PVA-Patentverwertungsanstalt
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PVA-Patentverwertungsanstalt filed Critical PVA-Patentverwertungsanstalt
Publication of EP0662587A2 publication Critical patent/EP0662587A2/fr
Publication of EP0662587A3 publication Critical patent/EP0662587A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a chimney or ventilation pipe attachment with a disc-shaped plate arranged at a distance above the chimney or pipe outlet opening.
  • a chimney cap of this type is already known from DE-A 1 138 502, the top plate of this cap being designed as a closed biconvex lens.
  • this chimney cap has the disadvantage that it causes a substantial increase in the negative pressure prevailing in the chimney pipe when the wind is blowing, which is extremely undesirable in today's oil and gas heating systems, since high negative pressures in the chimney cause large volume flows in the latter and in combination with strongly varying negative pressures in the chimney pipe have an unfavorable effect on the efficiency of the heating system connected to the latter.
  • the object of the present invention is in particular the creation of a chimney or ventilation pipe attachment, which does not have the above-mentioned serious disadvantage, that is to say that in the case of an extremely high insensitivity to wind flow over as large an inflow area as possible, a vacuum which is as constant as possible and thus a constant volume flow is achieved in the chimney, the vacuum present being said to be approximately the same as that of normal flow of the chimney without the attachment.
  • the chimney cap shown in FIGS. 1 and 2 represents the simplest embodiment of a cap according to the invention.
  • a disk-shaped cover plate 1 is arranged at a distance h from a base plate 3 fastened to the chimney head 2, the cover plate 1 being connected to the base plate 3 via supports 4.
  • the cover plate 1 is provided in the extension of the longitudinal axis 5 of the chimney outlet opening 6 with a central or through opening 7, both openings 6 and 7 being provided with a flanged edge 8 each for further dampening of the chimney.
  • the pressure coefficients c p are plotted as a function of the wind inflow angle ⁇ for a chimney without a chimney cap.
  • FIG. 4 shows the pressure coefficients c p as a function of the inflow angle ⁇ in the case of an outside chimney with a chimney cap according to FIGS. 1 and 2 under otherwise identical test conditions.
  • this chimney cap represents a venturi nozzle which is open on all sides, but with the essential difference that a passage opening 7 is provided in the lenticular cover plate 1 in the direction of the longitudinal chimney pipe axis 5.
  • this passage opening 7 is rounded off in a widening manner so that, when there is an inflow from above, the air entering this opening 7 is deflected laterally under the influence of the Coanda effect, thereby further improving the insensitivity to wind flow.
  • the maximum flow angle ⁇ at which no backflow occurs in the chimney is approximately -85 °, and that at relatively constant and relatively low c p values.
  • a drip edge 11 is provided along the outer circumference of the perforated biconvex lens 1, and a drip bead 12 is provided on the underside of this lens 1 in the region of the passage opening 7, the latter running along a diameter that is larger than the diameter which is the flanged edge 8 surrounding the passage opening 6 in the base plate 3.
  • the perforated lenticular body 1 is hollow, then it may be expedient to connect the drip bead 12 to the interior of this cavity via bores in the downwardly curved lens wall in order to enable an unimpeded drainage of any condensed water from the interior of this hollow body.
  • the chimney cap according to DE-A-1 138 502 mentioned at the outset was designed in such a way that it caused a significant increase in the negative pressure prevailing in the chimney compared to a chimney without a chimney cap in order to reliably prevent backflow in the chimney under all inflow conditions was therefore also named as a suction head.
  • the maximum c p values for a chimney cap according to DE-A-1 138 502 are at least twice as high.
  • the set goal with regard to the negative pressure and the associated volume flows in the chimney are achieved according to the invention; the exit velocity of the exhaust gases from the chimney is approx. 2 m / s, which corresponds to the measurements on a chimney with a diameter of 15 cm at full load of the heating system and an exhaust gas temperature at the boiler of approx. 160 ° C.
  • the side length of this cross section is equated to the diameter D 1 of a round chimney cross section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
EP94810758A 1994-01-11 1994-12-29 Chapeau de cheminée ou d'un conduit de ventilation. Withdrawn EP0662587A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8094A CH687834A5 (de) 1994-01-11 1994-01-11 Schornstein- oder Lueftungsrohraufsatz.
CH80/94 1994-01-11

Publications (2)

Publication Number Publication Date
EP0662587A2 true EP0662587A2 (fr) 1995-07-12
EP0662587A3 EP0662587A3 (fr) 1996-06-26

Family

ID=4178812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94810758A Withdrawn EP0662587A3 (fr) 1994-01-11 1994-12-29 Chapeau de cheminée ou d'un conduit de ventilation.

Country Status (2)

Country Link
EP (1) EP0662587A3 (fr)
CH (1) CH687834A5 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2834047A1 (fr) * 2001-12-21 2003-06-27 Ct Scient Tech Batiment Cstb Extracteur statique pour batiment
DE102016016074A1 (de) 2016-04-19 2024-05-23 Jochen Karsch Kaminaufsatz für einen Rauchgas- oder Lüftungsabzug

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191316369A (en) * 1913-07-16 1914-03-12 Louis Rasch Improvements in or relating to Chimney and Flue Tops.
DE2226730A1 (de) * 1972-06-02 1973-12-13 Karlheinz Kaffine Kaminaufsatz
WO1986006818A1 (fr) * 1985-05-14 1986-11-20 Inventina Ag Hotte
FR2595445A1 (fr) * 1986-03-05 1987-09-11 Tirebois Maurice Aspirateur regulateur de tirage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191316369A (en) * 1913-07-16 1914-03-12 Louis Rasch Improvements in or relating to Chimney and Flue Tops.
DE2226730A1 (de) * 1972-06-02 1973-12-13 Karlheinz Kaffine Kaminaufsatz
WO1986006818A1 (fr) * 1985-05-14 1986-11-20 Inventina Ag Hotte
FR2595445A1 (fr) * 1986-03-05 1987-09-11 Tirebois Maurice Aspirateur regulateur de tirage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2834047A1 (fr) * 2001-12-21 2003-06-27 Ct Scient Tech Batiment Cstb Extracteur statique pour batiment
DE102016016074A1 (de) 2016-04-19 2024-05-23 Jochen Karsch Kaminaufsatz für einen Rauchgas- oder Lüftungsabzug

Also Published As

Publication number Publication date
EP0662587A3 (fr) 1996-06-26
CH687834A5 (de) 1997-02-28

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