JPH0729524Y2 - Cable with air gap between conductor and jacket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cable capable of cooling a conductor by circulating a cooling medium such as water inside an induction heating furnace, an arc furnace, welding equipment, or the like. .

[Conventional technology and its problems]

Since this type of cable is used in the above induction heating furnace and the like, a large current flows in each case, and it is used in a heating and vibration environment. Further, in the case of welding equipment, bending is repeated. Therefore, this cable needs to have heat resistance, vibration resistance, and bending resistance.

However, conventional cables are those in which the conductors are twisted in a composite aggregate conductor, and the child strands of the composite aggregate conductor that are in contact with each other are twisted in different directions. (See Japanese Laid-Open Patent Publication No. 61-167319), or a braided conductor is generally used.

In this way, conventional cables are simply devised for twisting and gathering conductors.Therefore, when vibration and bending are applied at high temperature, metal fatigue rapidly occurs, and strands of twisted conductors are successively generated. If the wire breaks and the number of wire breaks exceeds a certain number, an arc is generated and all wires are rapidly broken.

[Purpose of device]

In view of the above points, the present invention has an object to provide a cable having a gap between a conductor and a jacket that can be stably used for a long period of time under high temperature and vibration environments and even when repeatedly bent. And

[Means for achieving the purpose of the invention]

In order to achieve the above object, in the cable according to the present invention, Fe is 0.02 to 0.7 wt%, P is 15 to 80 wt% of Fe, Zr and I
n is used individually or in a total amount of 0.01 to 0.5 wt% and the balance is Cu, and the O ₂ content is less than 50 ppm. The structure is made by molding an insulating tube.

Here, originally, Fe is mainly added to improve the mechanical strength of the copper alloy, but when the addition amount exceeds about 0.7 weight (wt)%, the decrease in conductivity becomes large, while 0.02 weight% If it is less than%, the effect of improving the carry-over bending strength, tensile strength and heat resistance becomes small. From this point of view, in the present invention, the Fe content is specified to be 0.02 to 0.7% by weight.

Further, by setting the P content to 15 to 80% by weight of the Fe content in the copper alloy, it is useful for further improving the above-mentioned various characteristics by the addition of Fe. The effect of addition is not exhibited. On the other hand, when the amount exceeds the upper limit, the conductivity of the copper alloy is rather deteriorated. The preferable content of P is about 28% by weight of Fe.

Furthermore, Zr or In has the effect of increasing the heat resistance of the copper alloy,
The effect is further enhanced when both are made to coexist. The content of Zr and In in the copper alloy is 0.01 to 0.5% by weight alone or in the total amount, and if the total content or the individual content thereof is less than 0.01% by weight, the heat resistance improving effect is small, while the content exceeds 0.5% by weight. And it becomes impossible to maintain the conductivity of the copper alloy.

The improvement in heat resistance due to the addition of Zr or In also leads to improvement in bending resistance and tensile strength. In other words, Fe-P-Cu alloys show deterioration of their properties with increasing temperature,
This is because the addition of Zr or In improves the heat resistance and reduces their deterioration.

Further, the O ₂ content of less than 50 ppm, if it is more than that, oxygen is present at the interface of the metal structure and the bond between the metal structures is weakened, and improvement such as improvement of the mechanical strength cannot be expected. Because. It is preferably less than 10 ppm.

The significance and effectiveness of the composition of the above copper alloy wire are described in Japanese Patent Application No.
-58794 (JP-A-62-214148) and the like for details.

[Action]

The cable configured in this manner is used in the same manner as the conventional one, but since the flexible conductor has the above-described configuration, it has high conductivity, heat resistance, vibration resistance, and bending resistance as is apparent from the above application. However, the cable has no deterioration of them.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the cross-sectional shape of the embodiment is the same as that of the conventional one, and its manufacturing is performed by the following steps.

First, the conductor 1 is Fe; 0.2735% by weight, P; 0.0705% by weight, I
n; 0.1010% by weight and the balance O ₂ content of less than 50ppm copper alloy by rolling to make a wire rod of 7.4mmφ, in order to remove the surface defects in the wire rod drawn to 6.0mmφ It is peeled to 5.7 mmφ and this wire is made 2.0 mmφ with a continuous wire drawing machine.

At this point, after annealing at 450 ° C. for 3 hours, the wire is made to have a diameter of 0.8 mmφ by a continuous wire drawing machine, the intermediate annealing is performed again, and a wire of 0.32 mmφ is obtained by the continuous wire drawing machine.

Next, after annealing this wire, it is plated with nickel, and 40 pieces of this nickel-plated wire are twisted left (pitch = 80
mm), and then twist 7 of these wires together (pitch =
85 mm) to make a collective twisted conductor 1 having a nominal cross-sectional area of 22 mm ² .

Next, as shown in FIG. 1, around the conductor 1, an insulating tube 2 made of vinyl chloride having an inner diameter of 10 mmφ and an outer diameter of 13 mmφ is formed.
Is extruded to obtain a cable A according to the present invention.

In addition, as shown in FIG. 2, the conductor support 3 may be inserted between the conductor 1 and the insulating tube 2.

[Effect confirmation test]

A sample having a length of 1.5 m is taken from the cable A of the present invention obtained as described above, and this sample A is laid in an S shape on the moving sheave 10 and the fixed sheave 11 having a diameter of 303 mmφ as shown in FIG. , Fix the end on the moving sheave 10 side, hang a 40 kg weight 12 on the end on the fixed sheave 11 side, move the moving sheave 10 up and down at 21.5 times / minute via the chuck 13, and disconnect. After performing a bending resistance test to obtain the number of vibrations until
The results shown in Table 1 were obtained. For disconnection detection, AC220V, 10
The test was also performed under the actual load of A, and as a comparative example, a cable B having the same structure as the cable A was tested in the same manner except that the conductor 1 was an electric soft copper wire.

Then, take a 70 cm conductor sample from the water cooling cable A and chuck only one end of the conductor a as shown in FIG.
It is fixed via 20 and the other end is separated by a length of 50 cm from the fixed end and is held by the vibration chuck 21, and in the heating furnace 23 at 250 ° C., the motor 22 and the eccentric vibrator 23 'are attached to the conductor a. As a result of vibrating the chuck 21 with a vibration of 2 mm at a frequency of 60 times / minute, no abnormalities were observed after 30 days,
From the 8th for the same structure with the conductor b of annealed copper wire for electricity
A disconnection was seen in 10 days.

From this result, it can be understood that the examples are superior in all of heat resistance, vibration resistance, and bending resistance.

Although the embodiment was water cooling, it is needless to say that the present invention can be applied to all the cables for circulating various cooling media such as air in the gap between the conductor 1 and the insulating tube 2 to cool them.

〔effect〕

As described above, the cable according to the present invention is excellent in heat resistance, vibration resistance, and bending resistance, and has a conductivity comparable to that of a conventional product using an electric soft copper wire as a conductor and has a significantly long life.

[Brief description of drawings]

1 and 2 are cross-sectional views of each embodiment of the cable according to the present invention, and FIGS. 3 and 4 are explanatory views of the effect confirmation test. 1 ... Conductor (collective twisted conductor), 2 ... Insulation tube, 3 ... Conductor support, A ... Water cooling cable.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Aoiya Nishiura 2-3-1, Iwata-cho, Higashi-Osaka City, Osaka Prefecture Tatsuta Electric Wire Co., Ltd. (72) Inventor Sajiro Shimizu 2-chome, Iwata-cho, Higashi-Osaka City, Osaka 3-1 In Tatsuta Electric Cable Co., Ltd. (72) Kenzo Ide, 2-3-1, Iwata-cho, Higashi-Osaka City, Osaka Prefecture (72) Inside Tatsuta Electric Cable Co., Ltd. (72) Kihachi Onishi Iwata, Higashi-Osaka City, Osaka Prefecture 2-3-1, Machi, Tatsuta Electric Wire Co., Ltd. (56) References: Actual Development Sho 54-15778 (JP, U) Copper Technology Research Journal, vol. 16. '77, pp. 165-176 Metal Handbook (revised 5th edition) Maruzen 622 pages Metal Data Book (revised 2nd edition) Maruzen 163 pages

Claims (1)

[Scope of utility model registration request] 1. Fe of 0.02 to 0.7 wt% and P of Fe of 15 to 80 wt%.
%, Zr and In individually or in the total amount of 0.01 to 0.5 wt%
A conductor characterized in that the O ₂ content of which the balance is made of Cu is around a flexible conductor obtained by collectively twisting a copper alloy wire having a content of less than 50 ppm, and a water distribution insulating tube that is a jacket with a gap is formed. A cable with a gap between it and the jacket.