JPH0738473B2 - Feedthrough - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a feedthrough for connecting a high voltage electric wire of a laser oscillator.

2. Description of the Related Art The structure of a conventional feed-through used as a connector for a high-voltage electric wire (hereinafter referred to as an HV cable) that supplies high-voltage electricity to a laser head of a laser oscillator that is decompressed from the atmosphere and its assembling procedure are described in As shown in FIG. 2, a copper cap 12 is brazed to an inner end surface of the laser head of a joint 11 fixed to the frame body 1 of the laser head via an O-ring. The HV cable 5 on the power supply side is inserted into the center hole of the joint 12, while the HV cable 6 inside the laser head needs to be grounded to the mesh-like shielded wire 9 that covers the outer periphery for high-voltage discharge. The tip of the cable 6 is inserted into the copper cap 13 and the tip of the shielded wire 9 is soldered to the copper cap 13. Then, the copper spacer 14 is inserted into the copper cap 12 or 13 and the core wires 5a, 6a of the HV cable 5 on the power source side and the HV cable 6 in the laser head are soldered. Then, inject silicon rubber through the gap between the copper cap and the copper spacer and insert the copper cap.
A method of brazing the outer joints of 12, 13 and the copper spacer 14 and filling with silicon rubber has been performed.

Problems to be Solved by the Invention Since the conventional method is to inject silicone rubber and then braze the joint between the copper cap and the copper spacer, the heat of brazing causes the silicone rubber to deform internally and impair the airtightness. Had the problem.

Means for Solving the Problems A joint in which the laser head 1 is airtightly fixed and has a cylindrical portion that encloses the connection portion of the core wires 5a and 6a of the high-voltage electric wires 5 and 6, and the insulating portion 7 is filled in the cylindrical portion. 2 and a cylindrical opening of the joint 2 are provided with lids 8 and 10 in which the outer shield wire 9 of the high-voltage electric wire 6 in the laser head is sandwiched.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. The joint 2 is fixed to the hole 1a formed in the frame 1 of the laser head via the O-ring 4 by the flat nut 3 screwed to the screw portion 2a. The joint 2 is formed with stepped center holes 2b and 2c, and a screw 2d is engraved in the opening of the large diameter hole 2c of the stepped center hole. The HV cable 5 on the power supply side that is connected to the external power supply is inserted in the stepped center hole and inside the laser head in the large diameter hole 2c.
The HV cable 6 and the core wires 5a and 6a are bonded to each other by soldering, and the stepped holes 2c and 2b are filled with an insulating agent 7 such as silicon rubber. And the screw 2d provided in the opening
A mesh-like shield that covers the outer circumference of the HV cable 6 by screwing an inner lid 8 in which the HV cable 6 is inserted into the central hole and an outer lid 10 in which the shield wire 9 is inserted into the central hole to close the opening. The tip 9a of the wire 9 is opened like a brim and is sandwiched and grounded to the frame 1 via the joint 2.

Action The joint 2 is fixed to the frame body 1 by the flat nut 3, and the HV cable 5 on the external power supply side is fitted into the stepped center holes 2b, 2c of the joint 2. On the other hand, inside the laser head covered with the shield wire 9
The outer lid 9 and the inner lid 8 are inserted into the HV cable 6, and in this state, the core wires 5a and 6a of the HV cables 5 and 6 are bonded by soldering. Next, the adhesive portion is placed in the central portion of the large diameter hole 2c, and the insulating agent 7 such as silicon rubber is injected from the opening of the joint 2 with an injection tool (not shown), and the insulating agent 7 is inserted into the stepped holes 2b, 2c. It is filled inside, and the inner lid 8 is screwed into the screw 2d at the opening and sealed. Next, the tip 9a of the shielded wire 9 is spread in a brim shape,
The outer lid 10 is pressed against the inner lid 8 to be grounded.

Effect As described in detail above, the present invention has a screw engraved in the opening of the joint that encloses the connecting portion of the core wire and sandwiches the shielded wire for ground connection, so there is no brazing process and air tightness In addition to having the effect of increasing the reliability, the method of supporting the HV cable becomes more reliable and the damage to the cable is reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a feedthrough of the present invention, and FIG. 2 is a cross-sectional view of a conventional feedthrough. 1 …… Laser head frame 2 …… Joint, 5,6 …… High-voltage electric wire 7 …… Insulating agent, 9 …… Shield wire

Claims (1)

[Claims] 1. A laser oscillator having a cylindrical portion which is airtightly fixed to a laser head and encloses a connecting portion of a core wire of a high-voltage electric wire, the cylindrical portion is filled with an insulating agent, and a cylindrical opening of the joint. A feedthrough in which a lid having the outer shield wire of the high-voltage electric wire in the laser head sandwiched therein is attached to the portion.