Patent ID: 9024228
Filing Date: 2015-05-05
Classification: H05H

Abstract:
1. A plasma cutting device comprising a plasma torch, a coolant liquid supply device for supplying coolant liquid to said plasma torch, a nozzle coolant liquid supply conduit, an electrode coolant liquid supply conduit, a nozzle coolant liquid return conduit, an electrode coolant liquid return conduit, a plasma gas supply conduit, and an assist gas supply conduit, said plasma torch comprising: an electrode; a nozzle; an electrode coolant liquid passage that cools said electrode with said coolant liquid supplied from said liquid supply device; and a nozzle coolant liquid passage that cools said nozzle with said coolant liquid supplied from said liquid supply device; wherein a part of said electrode coolant liquid passage and a part of said nozzle coolant liquid passage extend separately, independently, and substantially parallel within said plasma torch, said part of said electrode coolant liquid passage being at least between an intake of said electrode coolant liquid passage to said plasma torch and a vicinity of an end portion of said electrode, and said part of said nozzle coolant liquid passage being at least between an intake of said nozzle coolant liquid passage to said plasma torch and an outer surface of said nozzle, said nozzle coolant liquid supply conduit, said electrode coolant liquid supply conduit, said nozzle coolant liquid return conduit, and said electrode coolant liquid return conduit are exterior to both said plasma torch and said coolant liquid supply device, said nozzle coolant liquid supply conduit supplies said coolant liquid from said coolant liquid supply device to said nozzle coolant liquid passage, said electrode coolant liquid supply conduit supplies said coolant liquid from said coolant liquid supply device to said electrode coolant liquid passage, said nozzle coolant liquid return conduit returns said coolant liquid to said coolant liquid supply device from said nozzle coolant liquid passage after said coolant liquid has passed said outer surface of said nozzle, said electrode coolant liquid return conduit returns said coolant liquid to said coolant liquid supply device from said electrode coolant liquid passage after said coolant liquid has passed said end portion of said electrode, and when said plasma torch is viewed from its base end, said nozzle coolant liquid supply conduit, said electrode coolant liquid supply conduit, said electrode coolant liquid return conduit, said nozzle coolant liquid return conduit, said plasma gas supply conduit, and said assist gas supply conduit are arranged substantially in a circle around a central axis of said plasma torch.