ITGE950013U1

ITGE950013U1 - PRESSURE DAMPER AND VIBRATIONS INDUCED BY THE PROPELLER ON THE AFT AFT OF SHIPS AND BOATS.

Info

Publication number: ITGE950013U1
Application number: IT95GE000013U
Authority: IT
Inventors: Andrea Panarello
Original assignee: Andrea Panarello
Priority date: 1995-03-14
Filing date: 1995-03-14
Publication date: 1996-09-14
Also published as: IT239278Y1

Description

"Smorzatore di pressione e vibrazioni indotte dal'elica sulla volta di poppa di navi ed imbarcazioni" "Pressure damper and vibrations induced by the propeller on the stern vault of ships and boats"

Il presente trovato concerne una cassa strutturale ad espansione da sistemare all'interno di scafi di navi ed imbarcazioni in corrispondenza della volta di poppa al di sopra dell'elica di propulsione. The present invention relates to an expansion structural casing to be placed inside the hulls of ships and boats at the stern vault above the propeller.

La parte inferiore della cassa e' aperta mentre i fianchi laterali e la parte superiore sono stagni. Tale cassa ha lo scopo di attenuare considerevolmente le pulsazioni di pressione trasmesse dalle pale dell'elica sulla volta di poppa e quindi i livelli di vibrazioni e rumore indotti dall' elica sullo scafo. L'effetto smorzante e' garantito da un opportuno cuscino d'aria che si viene a creare all'interno della cassa e tra scafo ed elica a poppavia della cassa stessa. L'aria affluisce all'interno della cassa attraverso un opportuno tubo di sfogo sistemato sulla parte superiore della cassa e comunicante con l'atmosfera. La creazione di tale cuscino d'aria e' resa possibile da una opportuna sagomatura della cassa che presenta delle forme tali da consentirne l 'autosvuotamnto con il movimento proprio della nave/ imbarcazione . The lower part of the case is open while the lateral sides and the upper part are watertight. This case has the purpose of considerably attenuating the pressure pulsations transmitted by the propeller blades on the stern vault and therefore the levels of vibrations and noise induced by the propeller on the hull. The damping effect is guaranteed by an appropriate air cushion that is created inside the case and between the hull and the propeller aft of the case itself. The air flows inside the box through a suitable vent pipe placed on the upper part of the box and communicating with the atmosphere. The creation of this air cushion is made possible by an appropriate shaping of the case which has such shapes as to allow it to self-empty with the movement of the ship / boat.

Per migliorare tale effetto potranno essere altresi' predisposti in corrispondenza del lembo inferiore prodiero della cassa degli opportuni "flaps" o "denti" fissi, ovvero regolabili attraverso un opportuno sistema meccanico eventualmente comandato da servosistemi di tipo elettroidraulici o similari, alloggiati all'interno dello scafo della nave. In order to improve this effect, appropriate fixed "flaps" or "teeth", or adjustable through an appropriate mechanical system possibly controlled by electro-hydraulic or similar servosystems, can also be arranged in correspondence with the lower forward flap of the case. hull of the ship.

In alcuni casi potrà' essere necessario implementare il cuscino d'aria attraverso un opportuno impianto di insuff leggio ad aria compressa. In some cases it may be necessary to implement the air cushion by means of an appropriate compressed air blowing system.

Nella allegata tavola di disegni sono mostrati due disegni schematici illustranti la realizzazione del trovato: la fig. 1 e' una sezine longitudinale nella quale si distingue la sagoma della nave e la posizione della cassa in oggetto. La fig. n. 2 rappresenta una sezione trasversale in corrispondenza dell'elica. The attached drawing table shows two schematic drawings illustrating the embodiment of the invention: fig. 1 is a longitudinal section in which the shape of the ship and the position of the case in question are distinguished. Fig. n. 2 shows a cross section at the helix.

In tali figure con 10 e' indicata la superficie del mare, con 20 é' indicato la sagoma della nave. In these figures, the surface of the sea is indicated by 10, while the shape of the ship is indicated by 20.

La cassa in oggetto e' indicata con il numero 30, il tubo di sfogo con il numero 40, il flap con il numero 50. The case in question is indicated with the number 30, the vent pipe with the number 40, the flap with the number 50.

In pratica i particolari di esecuzione potranno comunque variare senza uscire dall'ambito del trovato e quindi dal dominio del modello industriale di utilità In practice, the details of execution may in any case vary without departing from the scope of the invention and therefore from the domain of the industrial utility model

Claims

CLAIMS 1.- Structural expansion box to be placed inside the hulls of ships and boats at the stern vault above the propeller.

2 Casing according to claim 1 characterized by an opening on the bottom and a suitable vent pipe in communication with the atmosphere. 3.- Crate according to claims 1 and 2 characterized by shapes and accessories such as to allow self-emptying due to the effect of the ship's own movement and the creation of an air cushion inside it and between the hull and the propeller aft of the ship. case itself that allows to considerably attenuate the pressure pulsations transmitted by the propeller blades on the stern vault and therefore the levels of vibrations and noise induced by the propeller on the hull 4 Casing according to claims 1, 2 and 3 possibly equipped with a suitable compressed air blowing system adapted to implement the effectiveness of the aforementioned air cushion. 5.- Box according to claims 1, 2, 3 and 4 possibly equipped with suitable fixed or adjustable "flaps" or "teeth" arranged in correspondence with the lower forward flap of the box designed to improve and / or regulate the Venturi effect which allows Self-emptying of the case with the movement of the ship / boat. 6.- Case according to claims 1, 2, 3, 4 and 5 possibly suitably arranged to allow the accommodation of large diameter propellers and / or "surface" propellers operating with the blade ends very close to the stern vault / lower extremity of the box (for example beyond the limits indicated by the regulations of the Lloyd's Register of Shipping) or inside the box itself.