EP0282462B1 - Unterwasserauspuffgerät für Motorboote - Google Patents

Unterwasserauspuffgerät für Motorboote Download PDF

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Publication number
EP0282462B1
EP0282462B1 EP88830085A EP88830085A EP0282462B1 EP 0282462 B1 EP0282462 B1 EP 0282462B1 EP 88830085 A EP88830085 A EP 88830085A EP 88830085 A EP88830085 A EP 88830085A EP 0282462 B1 EP0282462 B1 EP 0282462B1
Authority
EP
European Patent Office
Prior art keywords
exhaust device
water line
motorboats
whose
exhaust 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.)
Expired
Application number
EP88830085A
Other languages
English (en)
French (fr)
Other versions
EP0282462A1 (de
Inventor
Mario Amati
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0282462A1 publication Critical patent/EP0282462A1/de
Application granted granted Critical
Publication of EP0282462B1 publication Critical patent/EP0282462B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/12—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 specially adapted for submerged exhausting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/32—Arrangements of propulsion power-unit exhaust uptakes; Funnels peculiar to vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • the present invention refers to an underwater exhaust device for motorboats which is capable of reducing, notwithstanding its being substantially devoid of silencers, the disturbing exhaust noise in neutral and at low speed, and at the same time of overcoming further drawbacks occurring at average and high speed.
  • the conventional exhaust systems both for diesel and petrol engines, installed on trading, military or pleasure craft are provided with an exhaust pipe situated a hundred percent above the water line, both at transom and at broadside, it being possible in the latter case to provide the hull with external devices to send the exhaust gases abaft.
  • GB-A-2065036 From GB-A-2065036 is known, in exhaust systems for boats, the use of a main and a secondary exhaust pipe and of an expansion chamber.
  • the expansion chamber whose longitudinal section is trapezoidal shaped, is created by applying an external structure to the motorboat hull.
  • the device according to the invention is substantially devoid of silencers. Therefore, it offers many advantages, first of all merely depending on the absence of such silencers.
  • financial advantages resulting from the fact that it is not necessary to purchase and to install the silencers
  • technical advantages resulting from the increased power due to the absence of counterpressure, the absence of heat loss in the engine-room (provoked by the increased temperature created by the use of silencers), the absence of the silencers, weight
  • advantages concerning the space available for other uses resulting from the increased room in the engine room, which is normally taken up by silencers
  • ecological advantages resulting from the decreased exhaust fumes.
  • the exhaust device according to the invention is provided with a main exhaust pipe, having at least the final portion below the water line, a secondary exhaust pipe of smaller section, which branches off from the main pipe and is entirely located above the water line, in each condition of use of motorboats (i.e. neutral and low speed or high speed or planning) and an expansion chamber, in order to facilitate the emission of gases from the main exhaust pipe.
  • a main exhaust pipe having at least the final portion below the water line
  • a secondary exhaust pipe of smaller section which branches off from the main pipe and is entirely located above the water line, in each condition of use of motorboats (i.e. neutral and low speed or high speed or planning) and an expansion chamber, in order to facilitate the emission of gases from the main exhaust pipe.
  • the underwater exhaust device for motorboats is characterized by the fact that the expansion chamber is created by hollowing the motorboat hull out in the shape of a parallelepiped having the section in the shape of a non-isosceles right-angled triangle, whose shorter side is substantially perpendicular to the water line, whose longer side is substantially parallel to the water line and whose hypotenuse is substantially inclined downwards towards the stern.
  • the above device can also be provided with a projecting element in the fore portion, on the bow side, of the expansion chamber, in order to increase the pressure drop in the chamber while the motorboat is moving forwards.
  • the projecting element can be shaped like a parallelepiped having the section in the shape of a non-isosceles right-angled triangle, whose shorter side is substantially perpendicular to the water line, whose longer side is substantially parallel to the water line and whose hypotenuse is substantially inclined upwards towards the bow.
  • hypertenuse inclined upwards towards the bow also includes an upwardly curving line going towards the bow, and which is substantially concave in its lower portion.
  • the end section of the secondary exhaust pipe can be provided with a silencer; the water-lift bubbling silencer 7 ("Aqualift” type) would be the most advantageous.
  • 1 stands for the motorboat hull provided with the underwater exhaust device according to the present invention.
  • the main exhaust pipe 3 branches off from the engine 2, which drives the propeller 2′ and ends in the expansion chamber 4, created by hollowing the motorboat hull out in the shape of a parellelepiped having the section in the shape of a non-isosceles right-angled triangle, whose shorter side is perpendicular to the water line, whose longer side is parallel to the water line and whose hypotenuse is inclined downwards towards the stern.
  • a projecting element 5 is located in the fore portion of the expansion chamber 4 in the shape of a parallelepiped, having the section of a non-isosceles right-angled triangle, whose shorter side is perpendicular to the water line, whose longer side is parallel to the water line and whose hypotenuse is inclined upwards towards the bow.
  • the main exhaust pipe 3 branches off into the secondary exhaust pipe 6 of smaller section; the latter is entirely located above the water line and before reaching the outside is connected to a water-lift bubbling silencer 7, "Aqualift silencer", which contains the column of water 8 and the pipe 9, of which one end is in contact with the column of water 8 and the other end is open towards the outside.
  • the hull 1 is equipped with superstructures and rudder not shown in the figure.
  • the exhaust gases are easily discharged from the main underwater exhaust pipe 3 only, because under these circumstances they cannot overcome the hydrostatic pressure of the water column 8 contained in the silencer 7.
  • the exhaust device according to the present invention is part of more complex systems, that is to say motorboat engines or motorboats themselves.
  • engines motorboats equipped with engines available on the market can be supplied with the device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Claims (8)

1. Eine Unterwasserauspuffanlage für ein Motorboot, welche ein Hauptauspuffrohr, von dem wenigstens der Endabschnitt in jedem Gebrauchszustand des Motorbootes unterhalb des Niveaus der Wasserlinie liegt, ein zweites Auspuffrohr mit geringerem Querschnitt, welches von dem Hauptauspuffrohr abzweigt und in jedem Gebrauchszustand des Motorbootes vollständig oberhalb des Niveaus der Wasserlinie angeordnet ist, und eine Expansionskammer, um das Austreten von Gasen aus dem Hauptauspuffrohr zu fördern, umfaßt, gekennzeichnet durch das Merkmal, daß die Expansionskammer durch Aushöhlen des Motorbootrumpfes in der Form eines Parallelepipeds, dessen Querschnitt in der Form eines gleichschenkeligen rechtwinkeligen Dreiecks ausgebildet ist, dessen kürzere Seite sich im wesentlichen senkrecht zu der Wasserlinie, dessen längere Seite sich im wesentlichen parallel zu der Wasserlinie und dessen Hypotenuse sich im wesentlichen geneigt nach unten in Richtung zu dem Heck erstreckt, gebildet ist.
2. Die Unterwasserauspuffanlage nach Anspruch 1, worin der Rumpf in dem vor der Expansionskammer auf der Bugseite der Expansionskammer liegenden Teil mit einem vorstehenden Element versehen ist, um den Druckabfall, der sich in der Kammer ergibt, während sich das Motorboot vorwärts bewegt, zu erhöhen.
3. Die Unterwasserauspuffanlage nach Anspruch 2, worin das vorstehende Element wie ein Parallelepiped geformt ist, dessen Querschnitt die Form eines nicht gleichschenkeligen rechtwinkeligen Dreiecks aufweist, dessen kürzere Seite sich im wesentlichen senkrecht zu der Wasserlinie, dessen längere Seite sich im wesentlichen parallel zu der Wasserlinie und dessen Hypotenuse sich im wesentlichen geneigt nach oben in Richtung zu dem Bug erstreckt.
4. Die Unterwasserauspuffanlage nach Anspruch 3, worin die Hypotenuse des Querschnitts des vorstehenden Elements durch eine nach unten konkav gekrümmte Linie gebildet ist.
5. Die Unterwasserauspuffanlage nach wenigstens einem der vorhergehenden Ansprüche, worin der Endteil des zweiten Auspuffrohrs mit einem Schalldämpfer versehen ist.
6. Die Unterwasserauspuffanlage nach Anspruch 5, worin der Schalldämpfer ein Wasser anhebender blasenbildender Schalldämpfer ist.
7. Ein Motorbootmotor, gekennzeichnet durch das Merkmal, mit der Unterwasserauspuffanlage nach einem der Ansprüche 1-6 versehen zu sein.
8. Motorboote, gekennzeichnet durch das Merkmal, mit Motoren nach Anspruch 7 versehen zu sein.
EP88830085A 1987-03-10 1988-03-02 Unterwasserauspuffgerät für Motorboote Expired EP0282462B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT47705/87A IT1205740B (it) 1987-03-10 1987-03-10 Dispositivo per lo scarico subacqueo dei gas combusti di imbarcazioni a motore
IT4770587 1987-03-10

Publications (2)

Publication Number Publication Date
EP0282462A1 EP0282462A1 (de) 1988-09-14
EP0282462B1 true EP0282462B1 (de) 1991-10-09

Family

ID=11262006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88830085A Expired EP0282462B1 (de) 1987-03-10 1988-03-02 Unterwasserauspuffgerät für Motorboote

Country Status (4)

Country Link
EP (1) EP0282462B1 (de)
DE (1) DE3865327D1 (de)
ES (1) ES2027037T3 (de)
IT (1) IT1205740B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7172474B2 (en) 2002-07-10 2007-02-06 Siemens Aktiengesellschaft Electric energy supply system for a ship, in particular a navy ship that can be operated with low IR signature

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3066648B2 (ja) * 1990-04-12 2000-07-17 三信工業株式会社 小型滑走艇の排気装置
US5556314A (en) * 1994-03-08 1996-09-17 Sanshin Kogyo Kabushuki Kaisha Exhaust system for watercraft

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002136A (en) * 1975-10-14 1977-01-11 Ray Industries, Inc. Marine exhaust system
GB2065036A (en) * 1979-12-12 1981-06-24 Henwood M R Improvements in or relating to exhaust systems and/or boat hulls
US4393802A (en) * 1980-05-16 1983-07-19 Rizzo Salvatore A Boat hull with underside channel
JPS58152699A (ja) * 1982-03-09 1983-09-10 Akira Ikeda 船底排気式高速艇

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7172474B2 (en) 2002-07-10 2007-02-06 Siemens Aktiengesellschaft Electric energy supply system for a ship, in particular a navy ship that can be operated with low IR signature

Also Published As

Publication number Publication date
DE3865327D1 (de) 1991-11-14
IT1205740B (it) 1989-03-31
IT8747705A0 (it) 1987-03-10
ES2027037T3 (es) 1992-05-16
EP0282462A1 (de) 1988-09-14

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