Maschinenfabrik Sulzer-burckhardt Ag

Maschinenfabrik Sulzer-burckhardt

Maschinenfabrik Sulzer-burkhardt Ag

Norbert Feistel

A sealing element for dry running systems has a segmented sealing ring ( ) which comprises at least two ring segments ( ) which are arranged adjacently in its peripheral direction, with two adjacent ring segments ( ) each contacting one another in the assembled state along an intersection line ( ) which subtends an intersection angle (&agr;) which is different from 90&deg; to a tangent ( ) at the inner jacket surface ( ) of the sealing ring ( ). The sealing ring ( ) has an axial height (H ) which amounts to at most 5.5 mm, in particular to between 2 mm and 4.5 mm.

Sealing element for dry running systems and the use of a sealing element of this kind

The invention relates to a sealing ring for sealing a piston rod of a piston compressor. The sealing ring comprises three segments, wherein the segments have portions extending in the circumferential direction of the sealing ring, which form an overlapping joint. The overlapping joint brings about an excellent sealing effect in the axial direction.

Sealing ring

A sealing ring, in particular for a piston rod with a circular cross-section, which has a height in the axial direction as well as a surface oriented towards a sliding surface, with the surface being executed to extend cylindrically over a part of the height in order to form a sealing surface and being executed to become wider along a further part. The sealing ring has a high sealing action in the axial direction so that a majority of the gas flows out between the piston rod and the sealing surface so that a gas storage arises.

Sealing ring for a dry running piston rod

A sealing element for a dry running piston compressor, in particular for a dry running oxygen compressor, contains perfluoroalkoxy-copolymer.

Sealing elements for dry running piston compressors

Sealing arrangement for a piston rod with a circular cross-section, comprising a one-piece sealing ring with a parting joint and compensation clearance as well as a cover ring surrounding the sealing ring in the peripheral direction, with the sealing ring having a section which extends in the peripheral direction of the sealing ring at at one end and forms an overlapping ring joint together with the other end of the sealing ring, and with the sealing ring having a radial wall thickness decreasing towards the parting joint. This arrangement has an excellent sealing action in a direction axial to the arrangement.

Sealing arrangement

The choke arrangement comprises an elastic choke ring which consists of a single piece with a gap formed by a parting joint. The choke arrangement: further comprises a support ring which is arranged directly adjacent to the choke ring in the axial direction, with the support ring serving, among other things to cover over the gap of the choke ring. An advantage of the choke arrangement with an elastically resilient choke ring is to be seen wherein the choke ring reacts to dynamic pressure changes and thereupon changes its sealing properties. A peak in pressure produces an increased difference in pressure at the choke arrangement, whereby the elastic choke ring is pressed against the sliding surface of a piston rod and effects an increased sealing action, so that the pressure peak cannot propagate to a sealing ring placed after the choke arrangement. The choke arrangement thus behaves analogously to a frequency selective filter known from electrical engineering in that high-frequency pressure changes are sealed off, whereas static or slowly varying pressure components are not sealed off.

Choke arrangement and a method for operating said choke arrangement

Sealing ring disk

The piston (6) guided in a cylinder (1) has at least one split so-called trapped piston ring (10) disposed in an annular groove on the piston. The circumferential face (12) of the ring remote from the inner face (11) of the cylinder bounds in the annular groove a space (23) which is acted upon by the pressure of the gas in the compression space. Starting from this circumferential face (12) the piston ring exhibits two radial boundary areas (13, 14) parallel with one another, of which the area (14) next to the compression space extends over part of the radial width of the ring. The piston ring (10) is guided by its two parallel boundary areas (13, 14) to slide against corresponding areas in the annular groove. The remaining area (16) of the piston ring next to the compression space, starting from the circumferential face (15) next the inner face (11) of the cylinder, forms a wedge face which extends at an angle of from 5.degree. to 15.degree. up to a boundary area parallel with the boundary area (14) next to the compression space. The face in the annular groove adjacent to the wedge face (16) has the same angle and is parallel to the wedge face (16).

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Winterthur, Switzerland

Norbert Feistel