Marine propulsion – Means for accomodating or moving engine fluids – Cooling for engine
Patent
1995-08-14
1997-03-04
Avila, Stephen
Marine propulsion
Means for accomodating or moving engine fluids
Cooling for engine
B63H 2110
Patent
active
056073330
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a cooling water intake for use aboard a boat, comprising a first opening to the sea in the boat hull, a duct for water from the opening, and a second opening at the mouth of the duct, which second opening is adapted for connection to the cooling water system of a motor.
The invention also relates to a method for fabricating a cooling water intake body.
SUMMARY OF THE INVENTION
Cooling water intake aboard relatively small boats, i.e., vessels in the size range of leisure boats, have a simple cooling water intake that includes an opening in the boat hull and a duct for water from this opening and to a second opening, which is attached to the motor's cooling water System. The opening in the boat hull is oriented at a right angle to the hull side or bottom, and is frequently surrounded by an exterior end flange abutting with the outside of the hull skin. Observations often indicate that the inflow of cooling water to the motor is insufficient, particularly at greater speeds. The possible reason(s) for this have not been thoroughly investigated in connection with the invention, but instead an attempt has been made to develop a cooling water intake that provides an improved, stable and reliable supply of cooling water to the boat motors, even at maximum speeds (45 knots and thereaboats for leisure/pleasure boats and the like). In addition, it is also an object of the invention to provide a cooling water intake that may easily be adapted to various types and sizes of hulls.
It is also an objective of the invention to enable the prefabrication of a suitable cooling water intake, thereby to provide a unit that may be inserted into the boat hull of new structures as well as existing boats.
Still another objective of the invention is to disclose a method for fabrication of a cooling water intake in situ.
According to the invention, therefore, we propose a cooling water intake as described above, characterized in that the duct running from said first opening is curved inward and toward the stern.
Such a duct configuration will ensure a sufficient, stable supply of cooling water even under the highest prevailing speeds for boats of the type in question here.
It has proven particularly convenient for the cooling water intake to be formed as an integral body, thus providing an insertable member which may easily be mounted and adapted.
It is especially advantageous for this integral body to be constructed of a suitable composite material. An advantage attained thereby is that the area surrounding said first opening, i.e., the opening out to the sea, may thus be more easily adapted to the exterior hull surface, permitting attainment of a smooth area in this region, without cumbersome projections.
In some cases it may be appropriate to improve further the supply of cooling water by providing in the first opening a lip projecting beyond the side of the boat, which lip has the effect of directing the cooling water into the opening. The remaining area around the first opening or intake opening may advantageously be smooth and uniformly integrated into the outer surface of the boat hull, as mentioned above.
According to the invention, it has proven particularly expedient to have the interior confines of the duct, seen in longitudinal section perpendicular to the side or bottom of the boat, substantially and gradually rounded off from the first opening and inward into the duct.
It has also proven particularly advantageous for the configuration of the duct cross-section to be flattened near the first opening and progress into a conventional circular cross-section toward the second opening.
After the curve in the duct, as mentioned above, the duct may be oriented in a direction convenient for connection to the motor and/or for the mounting of a stop valve.
The invention may advantageously be realized by utilizing a method wherein the cooling water intake is fabricated in situ. According to the invention, therefore, we propose a method for fabrication of a cooling water intak
REFERENCES:
patent: 1862282 (1932-07-01), Schmidt
patent: 1884282 (1932-10-01), Schmidt
patent: 3561524 (1971-02-01), Satterthwaite
patent: 3765364 (1973-10-01), Booth
patent: 4069788 (1978-01-01), Nitzki
patent: 5106330 (1992-04-01), Nelson et al.
Avila Stephen
Kvaerner A.S.
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