Anode of an arc plasma generator and the arc plasma generator
An anode of an arc plasma generator and the arc plasma generator are disclosed. The plasma generator is a multi-stage gas admission type arc plasma generator, and the plasma generator includes a cathode and an anode. The anode comprises at least two portions ( 201, 203 ), wherein any two adjacent portions of the anode are connected electrically with one another.
1. An anode of an arc plasma generator, the plasma generator is a multi-stage gas admission type arc plasma generator, the plasma generator includes a cathode and an anode, the anode comprises at least two portions, wherein any two adjacent anode portions are connected electrically with one another,
wherein there are provided gas guiding holes between any two adjacent anode portions, the gas guiding holes being tangential holes or holes that cause the direction of gas flow speed to possess tangential and axial vectors simultaneously,
wherein end faces of the two adjacent anode portions adjoin and contact one another sufficiently, at the contact position, the diameter of the anode portion farther from the cathode is bigger than that of the other anode portion to form a flow guiding groove, introducing medium gas introduced by the gas guiding holes into the plasma generator in order, and
wherein the flow guiding groove forms a channel along with an intracavity of the anode, in which the gas flow exported by the gas guiding holes goes forward spirally along the wall of the intracavity of the anode and an arc root is conveyed forward into the anode portion farthest from the cathode.
2. The anode of an arc plasma generator as claimed in claim 1 , characterized in that, the anode portion farthest from the cathode includes any one of the following components:
a gradually narrowing-expanding throat component,
a gradually narrowing throat component,
a component consisted of a gradually narrowing throat and a gradually expanding throat, and
a straight section component.
3. The anode of an arc plasma generator as claimed in claim 2 , characterized in that, the anode portion nearest to the cathode portion includes a gradually narrowing-expanding throat component.
4. The anode of an arc plasma generator as claimed in claim 2 , characterized in that, except the anode portion farthest from the cathode, all of the remainder of the anode portions include respectively a gradually narrowing-expanding throat component.
5. The anode of an arc plasma generator as claimed in claim 1 , characterized in that, the gas guiding holes are distributed over the anode or a gas ring uniformly.
6. An arc plasma generator, characterized in that, it comprises an anode as claimed in claim 1 .
7. The arc plasma generator as claimed in claim 6 , characterized in that, there is provided a gas insulating ring between the cathode and the anode portion nearest to the cathode.
8. The arc plasma generator as claimed in claim 6 , characterized in that, the plasma generator is an arc plasma generator of hot cathode type, wherein there are provided gas guiding holes between the cathode and the anode portion nearest to the cathode, the gas guiding holes are tangential holes or holes that cause the direction of gas flow speed to possess tangential and axial vectors simultaneously.
9. The arc plasma generator as claimed in claim 6 , characterized in that, the plasma generator is an arc plasma generator of cold cathode type, wherein there are provided gas guiding holes between the cathode and the anode portion nearest to the cathode, the gas guiding holes are tangential holes.