INJECTION HEAD OF FLUID

PROBLEM TO BE SOLVED: To provide an injection head in which the quality of a jet is improved and liquid can be supplied to a mechanical boring tool. SOLUTION: The head (30) is mounted on one end part of a string to jet pressure fluid. A head body (40) has a lower end part for mounting the mechanical...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	MATHIEU FABRICE, GESSAY JEAN-CLAUDE, MOREY JACQUES
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING EMBANKMENTS EXCAVATIONS FIXED CONSTRUCTIONS FOUNDATIONS HYDRAULIC ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS SOIL SHIFTING UNDERGROUND OR UNDERWATER STRUCTURES
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an injection head in which the quality of a jet is improved and liquid can be supplied to a mechanical boring tool. SOLUTION: The head (30) is mounted on one end part of a string to jet pressure fluid. A head body (40) has a lower end part for mounting the mechanical boring tool having a supply pipe, a nozzle (42) and a duct for connecting the supply pipe to the nozzle. The duct has a central axis (L) and a first end part connected to the lower end of the supply pipe and a second end part tangentially connected to the axis xx' of the nozzle (42). The central axis is specified by a curved part having the radius of curvature changing continuously. The cross-sectional area of the duct is regularly reduced to at least a half as long as the entire length from the first end part (50a) to the second end part (50b). COPYRIGHT: (C)2004,JPO