Device for producing a bore in the ground, rotary drive device and rotary seal arrangement
AssigneeAker Wirth GmbH
InventorsFrank Foerster, Thomas Dolls
Life of this patent
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Abstract
A device for producing a bore in the ground includes a spindle comprising a rotary lead-through and a first sealing face configured to be cylindrical. The spindle is configured so as to be rotatably led through a housing via the rotary lead-through. The housing comprises a second sealing face configured to be concentric with respect to the first sealing face. A rotary seal arrangement is configured to seal the rotary lead-through of the spindle through the housing. The rotary seal arrangement comprises a shaft seal configured to act between the first sealing face of the spindle and the second sealing face of the housing. A labyrinth seal is arranged upstream of the shaft seal when viewed from an outside of the housing.
Claims9
A device for producing a bore in the ground, the device comprising:
- a spindle comprising a rotary lead-through and a first sealing face configured to be cylindrical, the spindle being configured so as to be rotatably led through a housing via the rotary lead-through;
- the housing comprising a second sealing face configured to be concentric with respect to the first sealing face, the housing being a part of a power rotary head (top drive);
- a rotary seal arrangement configured to seal the rotary lead-through of the spindle through the housing, the rotary seal arrangement comprising a shaft seal configured to act between the first sealing face of the spindle and the second sealing face of the housing;
- and
- a labyrinth seal arranged upstream of the shaft seal when viewed from an outside of the housing.
Dependencies are inferred from the claim text.