| 摘要 |
PURPOSE:To prevent a fine hole to be clogged by dust when refrigerator oil passes through it and reduce a time for machining, by defining counter sunk recesses at opposite sides of the fine hole of a valve plate. CONSTITUTION:When a compressor starts operation, oil from an oil pump stays in an oil sump 7 and a small amount of the oil flows into a pressurized suction chamber 12a through a fine hole 12. Since the fine hole 12 is liable to be clogged with iron powder, dust or the like, the dust is caused to stay on the end plate of a cylinder 6 and in a counter sunk recess 10a defined in a valve plate 10. Since the distance between the fine holes 12 is made shorter by a counter sunk recess 10b defined together with the recess 10a, which permits a machining time by laser beam to be shortened. In addition, a dispersion of the distance between the fine holes 12 is prevented by both side grinding for stabilizing an amount of oil flow.
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