JPS6344888Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a water-cooled flexible conductor used in a high-frequency induction heating device, etc., which prevents water leakage at the connection portion of the water-cooled conductor.

FIGS. 1 and 2 are a schematic front view and side view of a high-frequency induction heating device. This device includes a high-frequency power source 20 disposed at a predetermined position, such as a high-frequency oscillator, and a high-frequency induction heating device that is movable relative to a workpiece 21. A head section 22 is provided for heating the workpiece 21, and the power supply section 20 and the head section 22 are provided.
It is composed of a connecting conductor 18 and the like that connects the two. Two fixed transmission conductors 23, such as copper pipes, which are capable of transmitting not only a high frequency current but also cooling water from a pure water circulation device (not shown) are horizontally extended in parallel to each other in the high frequency power supply section 20. The head section 22 is composed of a matching transformer 24, an inductor 25, etc., and two movable transmission conductors 26, such as copper pipes similar to the fixed transmission conductor 23, are connected parallel to each other and perpendicular to each other. is attached to. Both conductors 23,
26 are connected by flexible connecting conductors 18, 18. The head portion 22 is supported by a moving mechanism (not shown) so as to be movable in three directions: up and down, left and right, and front and rear directions, and the workpiece 21 is automatically fed by a material feeding device.

Since the connection structure between each of the connection conductors 18 and the transmission conductors 23 and 26 connected to both ends thereof is substantially the same, the connection structure with the mobile transmission conductor 26 will be described below. The connecting conductors 18, 18 are constructed as shown in FIG. That is, 27 is a flexible hose made of synthetic resin such as a soft vinyl hose, and a circular mesh-like braided conductor 28 is inserted into this hose 27.
A helical spring-shaped holder 29 made of heat-resistant and insulating hard synthetic resin is inserted into the inside of the holder 8 . The ends of the connecting conductors 18, 18 configured in this way are connected to a connecting fitting 30 detachably attached to the flange portion 26a of the moving transmission conductor 26. The connecting portion 30a of the connecting fitting 30 is fitted into a flexible hose 27, and the outer periphery of the fitting hose is wrapped and fixed with a synthetic resin wire 32 to maintain the force of release due to water pressure and maintain airtightness. Note that the outer peripheral surface of the connecting portion 30a is
It is formed in the shape of an inclined step in order to improve the retention force of the hose 27 to be fitted and the airtightness.

The flange portion 30b of the connection fitting 30 and the flange portion 26a of the movable transmission conductor 26 are detachably attached using a plurality of fasteners 33 and are attached watertight via a seal member 34. A hole 35 for passing the cooling water and the conductor 28 is formed in the axial center of the connecting fitting 30, and a hole 35 is formed in the flange portion 30b for attaching the end of the conductor 28. A flange portion recess 36 formed with a large diameter is provided. The conductor 28 is connected to the bottom of the flange recess 36 by a fastener 37. 38 is a heat-resistant insulating spacer.

In the connection structure between the hose 27 and the connection part 30a of the connection fitting 30 used in the conventional high-frequency induction heating device configured as described above, there are two problems due to the aging of the hose 27. There is a disadvantage that the elasticity of the hose 27 is lost due to the heat generated when the synthetic resin wire 32 is tightened and hardened, resulting in water leakage from the portion indicated by reference numeral 39 in FIG. 3.

The purpose of this invention is to eliminate the above-mentioned drawbacks and to provide a water-cooled flexible conductor that reliably prevents water leakage at the joints of the water-cooled conductor without being affected by aging or heat during tightening and hardening. shall be.

An embodiment of this invention will be described below with reference to FIG. 4. The same parts as in FIGS. 1 to 3 are designated by the same reference numerals. In FIG. 4, the connecting fitting 30
A sealing flange 40 made of hard synthetic resin is disposed on the outer circumferential side of the housing with a sealing member 41 interposed therebetween. The seal flange 40 is connected to the connecting fitting 3 by the fastener 33.
Fixed to 0. A portion of the seal flange 40 extends along the outer circumferential side of the cylindrical connection portion 30a of the connection fitting 30, and is butted against the end of the hose 27 fitted into the connection portion 30a. The abutted portions are welded using a welding rod made of the same material as the hose and seal flange, for example, made of vinyl chloride. 42 is the welding part. The outer periphery of the welded portion 42 and the synthetic resin wire 32 is coated with a protective insulating tape 43 to prepare the exterior.

In the above description, the connection structure has been described only at one end of the hose 27, but the other ends have the same structure.

As described above, according to this invention, a sealing flange made of hard synthetic resin is welded to the end of a flexible hose to make it integral, and the sealing flange is watertightly fixed. Compared to hoses that are watertight using only elasticity, the hose hardens over time or due to heat effects, and the airtightness due to elasticity is lost, allowing water to enter between the hose and the connecting fittings. Since a sealing member is interposed between the metal fittings, watertightness can be maintained by the sealing member, and water leakage, which is a cause of accidents in the induction heating device, can be reliably prevented.

[Brief explanation of drawings]

Figures 1 and 2 are a schematic front and side view of a high-frequency induction heating device, Figure 3 is a cross-sectional diagram with one end of the connecting conductor partially cut away, and Figure 4 is an embodiment of the invention. FIG. 2 is an explanatory cross-sectional view with one end of a flexible conductor partially cut away. 27... Flexible hose, 28... Braided conductor, 3
0... Connection fitting, 30a... Connection part, 32... Wound synthetic resin wire, 40... Seal flange, 41
... Seal member, 42 ... Welding site, 43 ... Protective insulating layer.

Claims (1)

[Scope of utility model registration request] A connecting fitting having a cylindrical connecting part and a flange formed at an end; and a flexible conductor inserted into the connecting part of the connecting fitting and having an end electrically connected to the flange. , a flexible hose that is inserted halfway up the outer periphery of the connection part of the connection fitting and allows water to flow therein for cooling the flexible conductor, and a hose end attached to the connection part and a flange of the connection fitting. A seal flange made of hard synthetic resin is placed around the outer periphery of the connection between the seal flange and the connection fitting, and it is inserted in the area where the seal flange and the connection fitting come into contact to prevent water from leaking from the contact surface between the seal flange and the connection fitting. Water cooling characterized by comprising: a sealing member, a melting member for melting and joining the abutting portion of the seal flange and the hose, and a synthetic resin wire wound and fixed around the outer circumference of the hose inserted into the connection portion. flexible conductor.