Repaired ring and method for repairing a ring which is used for sealing purposes

Abstract

By applying material on only one side in the case of a revision, seal rings can be easily rebuilt and reused.

Claims

1. A repaired ring for sealing comprising: opposite contact surfaces, wherein the repaired ring was previously in use as a new ring and a worn material resulting from operation of the repaired ring was removed by means of processing the opposite contact surfaces, and in which a thickening is present on only one of the opposite contact surfaces after the worn material is removed to compensate for a removal of the worn material from both the opposing contact surfaces.

2. The repaired ring as claimed in claim 1, in which a welded-on layer is present as thickening, wherein the repaired ring has another material and/or another microstructure in the thickening.

3. The repaired ring as claimed in claim 1, in which the thickening is performed by means of an insert ring in a depression.

4. The repaired ring as claimed in claim 1, in which the repaired ring is metallic.

5. The repaired ring as claimed in claim 1, in which the new ring constitutes a forged part.

6. A method for repairing a ring, comprising: removing a worn material from a first contact surface and a second, opposing contact surface, the worn material resulting from operation of the ring; and applying a material to only one of the first contact surface and the second, opposing contact surface to compensate for the removing of the worn material from both the first contact surface and the second, opposing contact surface.

7. The method as claimed in claim 6, in which a welded-on layer is present as thickening, wherein the repaired ring has another material and/or another microstructure in the thickening.

8. The method as claimed in claim 6, in which the thickening is performed by means of an insert ring in a depression.

9. The method as claimed in claim 6, in which the repaired ring is metallic.

10. The method as claimed in claim 6, in which an original ring constitutes a forged part.

Description

BRIEF DESCRIPTION

(1) Some of the embodiments will be described in detail, with reference to the following figures, wherein like designations denote like members, wherein:

(2) FIG. 1 shows a cross-sectional view of a sealing ring, in accordance with embodiments of the present invention;

(3) FIG. 2 shows a front view of the sealing ring of FIG. 1, in accordance with embodiments of the present invention;

(4) FIG. 3 shows an enlarged, cross-sectional view of a sealing ring, in accordance with embodiments of the present invention;

(5) FIG. 4 shows an enlarged, cross-sectional view of another embodiment of the sealing ring, in accordance with embodiments of the present invention;

(6) FIG. 5 shows an L-ring with contact surfaces, in accordance with embodiments of the present invention; and

(7) FIG. 6 shows an I-ring with contact surfaces, in accordance with embodiments of the present invention.

(8) The figures and the description present merely exemplary embodiments of the invention.

DETAILED DESCRIPTION

(9) FIGS. 1, 2 show a new sealing ring 1′, in this case in a U-shape, but it may also have an I- or L-shape.

(10) The new sealing ring 1′ has, on both sides, contact surfaces 4, 7 that are formed on the inner edge 20 and are elevated from the surrounding surface 5.

(11) During operation, wear occurs by means of friction, oxidation and/or erosion of the contact surfaces 4, 7 of the sealing ring 1′, or on the opposite contact surfaces 4 and 7.

(12) In the case of maintenance, these opposite contact surfaces 4, 7 are reworked, whereby the old ring 1′ no longer has the sealing action and the ring cannot therefore be used further.

(13) The sealing surface of the ring can be refurbished by means of a new repair concept. The contacting action of the sealing ring is thus restored.

(14) FIG. 4 shows, in cross section, such a ring 1, in this case having for example a U-shape.

(15) According to embodiments of the invention, the contact surfaces 4, 7 have been processed, but material is applied only to one contact surface 7.

(16) The application of the material may be performed by means of various application methods, such that a thickening 10 is performed.

(17) These can be additive methods in which the ring is embedded in a powder bed and the region is built up step by step by means of selective laser sintering or laser melting or the sealing function is restored by means of build-up welding, in particular powder build-up welding.

(18) The thickening 10 is performed by means of selective laser melting (SLM) or laser metal deposition (LMD) to give a near-net shape.

(19) FIG. 3 shows another variant.

(20) In the case of the ring 1, not only is worn material removed as per FIG. 4, but a groove 16 is intentionally created in which an insert ring 13 is inserted as thickening 10.

(21) The insert ring 13 may be connected in the groove 16 in various ways: soldering, welding, mechanical clamping.

(22) No new rings need to be procured or stocked. The old rings are treated only if this is diagnosed as being required.

(23) The thickening 10 on only one side 7 compensates the removal on both sides 4, 7 or on the contact surface opposite the sealing ring surface.

(24) FIG. 5 shows an L-ring 11 with contact surfaces 20′ and FIG. 6 shows an I-ring 111 with contact surfaces 21, 21′.

(25) Although the present invention has been disclosed in the form of preferred embodiments and variations thereon, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the invention.

(26) For the sake of clarity, it is to be understood that the use of “a” or “an” throughout this application does not exclude a plurality, and “comprising” does not exclude other steps or elements.