Valve plate for a reciprocating compressor
The invention concerns a valve plate for a reciprocating compressor, the valve plate being made as a sintered part, having on at least one valve plate surface at least one valve seat surface ( 30, 31 ) being worked after sintering. In order to simplify the manufacturing of the valve plate, the valve plate surface has at least one defined area portion with a relatively uneven surface and at least one defined area portion with a relatively even surface.
1 . A valve plate for a reciprocating compressor, the valve plate being a sintered part having on at least one valve plate surface at least one valve seat surface worked after sintering, wherein the valve plate surface has at least one defined area portion with a relatively uneven surface and at least one defined area portion with a relatively even surface.
2 . The valve plate according to claim 1 , wherein compared to the at least one defined area portion with the relatively even surface, the at least one defined area portion with the relatively uneven surface is so large that the valve plate surface concerned can be manufactured in one stamping step.
3 . The valve plate according to claim 2 , wherein the at least one defined area portion with the relatively uneven surface is larger than the at least one defined area portion with the relatively even surface.
4 . The valve plate according to claim 1 , wherein in the area of the valve seat surface(s) [[( 30 , 31 )]] the valve plate surface has a relatively even surface.
5 . The valve plate according to claim 1 , wherein the area of at least one valve body bearing surface the valve plate surface has a relatively even surface.
6 . The valve plate according to claim 4 , wherein the valve seat surface and/or the valve body bearing surface are located in the area of recesses or projections.
7 . The valve plate according to claim 1 , wherein an uncritical part of the relatively uneven surface has indentations or recesses, in which the sintering material, of which the valve plate is made, is locally compressed.
8 . The valve plate according to claim 7 , wherein the indentations or recesses have a depth of a few tenths mm.
9 . The valve plate according to claim 7 , characterized in that wherein the indentations or recesses have the shape of a spherical segment, a truncated pyramid segment or a truncated cone segment.
10 . The valve plate according to claim 7 , wherein a critical part of the relatively uneven surface comprises at least one sealing zone on the valve plate surface.
11 . A method for manufacturing a valve plate according to claim 1 involving the following steps:
a. a preferably powdery sintering material is pressed to form a blank;
b. the blank is sintered;
c. the sintered blank is stamped during one single method step.
12 . The method according to claim 11 , wherein at least one valve seat surface and/or at least one valve body bearing surface is/are calibrated during the only stamping step.
13 . The method according to claim 11 wherein through-holes and/or indentations and/or projections of the valve plate are calibrated in the only stamping step.
14 . The method according to claim 11 , wherein the valve plate surfaces of the sintered and stamped valve plate are sealed.
15 . A device for stamping a valve plate surface according to claim 1 , by a method comprising the steps of pressing a preferably powdery sintering material to form a blank; sintering the blank; and stamping the sintered blank during one single method step; by means of a stamping tool, wherein the stamping tool has a plurality of projections, which serve the purpose of providing indentations in the at least one defined area portion with a relatively uneven surface.
16 . A reciprocating compressor with a cylinder block, in which a compression chamber is formed, delimited on one side by a valve plate according to claim 1 wherein that is clamped between the cylinder block and a cylinder head cover.