DE883427C - Drilling turbine for deep drilling devices with core drills - Google Patents

Description

In the case of deep drilling, the so-called core drilling, i. H. the Drilling: with a central core standing, more and more because of its advantages and has recently also been used in drilling processes: Application where the drill - by a turbine driven by the flushing fluid in rotation on site is moved. The hollow drill used for core drilling is with the lower one Coupled to the end of the turbine shaft and must therefore be as long as the core to be acquired be. However, the long length of the hollow drill often has a very rough run result, whereby the drilled core often breaks off and individual core pieces between the moving drill wound and the stationary core residue are ground up. In order to but the main advantage of core drilling is lost.

According to the present invention, these shortcomings become known ones Devices .that eliminates the fact that the turbine shaft is made hollow and that a tube attached to a stationary part of the turbine housing (core tube) with one end through the hollow turbine shaft and through: the likewise hollow one Core drill protrudes right up to its cutting edge. This fixed core tube protects the core, which is also stationary, before breaking, smashing or grinding and guides it through the hollow turbine shaft without any significant loss of friction into the feed pipe (drill pipe) above the turbine. The length of the core drill or the drilling shaft carrying the core drill is now independent of the core length and can be as short as it is permissible for other reasons is.

With the proposed drilling device, any length of drill core be achieved. Around the core also securely in the drill pipe above the bulb turbine to guide, the end of the core tube facing away from the core drill protrudes depending on the desired Length of the drill core correspondingly far into the drill pipe.

Furthermore: the end of the core tube protruding into the drill tube, in particular: if this end is very long, or by ribs. The like. Supported against the drill pipe will.

In. .The drawing is a Ausführungsheispiei one according to the invention trained drilling turbine shown schematically in section.

On the drilling turbine, for example, which has a three-stage design, is the Turbine rotor i with its hollow shaft ¢ mounted in bearings 2 and 3. The turbine casing 5 is at the same time as a supply line for the drive: - and rinsing liquid serving drill pipe 6 screwed. At the lower end of the hollow turbine shaft q. the likewise hollow core drill 7 and a further side drill 7 'are arranged. The stationary core tube 8 is flanged to the upper bearing body 2 of the drilling turbine and protrudes down through the hollow turbine shaft almost to the cutting edge of the core drill 7 and up into the drill pipe (feed pipe) C. The upper end of the core pipe is supported against the drill pipe 6 by ribs 9.

Inside: the core tube and near the lower end can. one on known safety gear be provided; when pulling up the drilling rig holds the Blohrkern.

Claims (1)

PATENT CLAIMS: i. Drilling turbine for underground drilling devices to drive of core drills on site, characterized in that: that the turbine shaft (4.) is hollow is and that a fixed part (2) .des. Turbine housing attached Tube (core tube 8): at one end through the hollow turbine shaft and through the also hollow core drill (7) up to: close to the cutting edge of which protrudes. z. Drilling turbine according to claim i, characterized in that the end facing away from the core drill of the IC core tube (8) depending on the desired length of the drill core into .the drill pipe (6) protrudes. 3. drilling turbine according to claim 2, characterized in that that the end protruding into the drill pipe: the core pipe by ribs (9) or the like. Against the drill pipe is supported.