PLASMA TORCH

摘要

[A problem to be solved];To provide a plasma torch in which a nozzle can be effectively cooled to an ejecting hole of plasm arc and which has a stable electrification properties;[Measures to solve the problem];The plasma torch of the present invention has nozzle A and the torch body B. The nozzle A has the inner nozzle 2 and the inner cap 3 which is fastened to the torch body with the inner nozzle 2. The annular water passage 8 and a plurality of independent water passages 9 are formed between the inner nozzle 2 and the inner cap 3. A fastening force applied when the inner cap 3 is fastened to the nozzle base 14 is transmitted via the partitions 2f. The torch body B has the water supply port 20 and the water drain port 21. At least one of the water supply port 20 and the water drain port 21 is configured as a groove which extends on a plane which crosses the axis and which is connected to the water passage. When the nozzle A is fastened to the torch body B, one of the independent water passages communicates with the water supply port and another one of the independent water passages communicates with the water drain port. Further, the rear end surface 2h of the inner nozzle is in contact with the end surface 14a of the nozzle base 14 thereby obtaining electrical conductivity.

主权项

1. A plasma torch, comprising:
a nozzle in which an ejecting hole disposed in the center of the nozzle for ejecting a plasma arc, an annular water passage for cooling water, and a plurality of independent water passages which communicate with the annular passage are formed; and a torch body in which a plurality of water passages for circulating cooling water for cooling the nozzle, wherein the nozzle includes:
an inner nozzle which ejects a plasma arc; andan inner cap which is fastened to the torch body with the inner nozzle,wherein when the inner nozzle is fitted to the inner cap, the annular water passage is formed between the inner nozzle and the inner cap, the plurality of independent water passages which communicate with the annular water passage are formed by a plurality of partitions, and a fastening force for fastening the inner cap to the torch body is transmitted from the inner nozzle to the torch body via the plurality of partitions, wherein the torch body includes:
a water supply port which is connected to one of the independent water passages for supplying the cooling water to the nozzle; anda water drain port which is connected to one of the plurality of the independent water passages for draining the cooling water which has passed through the nozzle,wherein the water supply port and the water drain port are formed on an end surface of a nozzle base having electrical conductivity, at least one of the water supply port and the water drain port is configured as a groove connected to one of the water passages, the groove extends on a plane which crosses the axes of the water passage, and the interval on a circumference of a circle between the ends of both grooves or the interval on the circumference of the circle between an end of one of the grooves and an end of the water supply port or the water drain port is greater than a pitch on the circumference of the circle of the partitions formed on the nozzle for forming independent water passages, and wherein when the nozzle is fastened to the torch body, one of the independent water passages formed on the nozzle communicates with the water supply port, another one of the independent water passages formed on the nozzle communicates with the water drain port, and an end surface at a partition side of the inner nozzle constituting the nozzle is able to be in contact with an end surface of the nozzle base so as to obtain energization.