| 摘要 |
A liquid-sealed shaft seal for sealing the lead-through between an inner space and an outer space of a shaft with feed bores for a sealing liquid which is supplied at higher pressure than the pressure in the inner space. The seal includes partial seal gaps extending on both sides of these feed bores, and includes an inner partial seal gap in the form of a threaded shaft seal with recycling toward the sealing liquid feed. A disk with a larger outside diameter than the diameter of the inner partial seal gap is placed between the inner and outer partial seal gaps, and forms a pump chamber with the seal housing. A radial pressure increase of the supplied sealing liquid occurs in the pump chamber at higher speeds of rotation, and bores that are connected to a pressure chamber open into its radially outer area. A pressure chamber is formed by the seal housing and a slip ring which is located at the end of a threaded shaft seal toward the inner space, and it is pressed axially against the shaft or shaft bushing when the shaft is stopped and at low speeds, by an element producing an axial force toward the outer space, and by gas forces. At higher speeds the ring seal is lifted away from the shaft or shaft bushing by the radial pressure increase produced by the rotating disk.
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