JP2000040424A - Heat resistant coaxial cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coaxial cable usable at a high temperature by arranging a core wire inside a corrugated heat resistant thin metallic pipe having a longitudinal section worked in wave shape through a heat resistant insulating member composed of aggregation of straight line material or plural circular plate materials. SOLUTION: A heat resistant thin metallic pipe 11 is composed of a stainless steel thin plate pipe, one example of heat resistant metal, and the crest part 15 and the trough part 16 are formed in a spiral shape bendable in the free direction in a radius of curvature of a certain degree. A diameter of the heat resistant thin metallic pipe 11 is set to about 10 to 50 mm, and a thickness is desirably selected in a range of about 0.1 to 1.5 mm. A mica plate 12 is formed by circularly working a thin mica plate raw material having a thickness of about 0.5 to 2 mm, and the diameter is almost the same as an inside diameter of the trough part 16. The mica plate 12 is supported by abutting to two places inside of the trough part 16. An inserting hole is arranged in a central position of the mical plate 12 to insert a conductor 13 composed of sliver or copper. A thin diameter short pipe 14 is installed on the core wire 13 between adjacent mica plates 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant coaxial cable which can be used even in a high-temperature environment (for example, 700 to 1000.degree. C.).

[0002]

2. Description of the Related Art A general heat-resistant coaxial cable uses a resin such as Teflon (trade name) for insulation between a core wire and a shield sheath.

[0003]

However, the working temperature of the heat-resistant coaxial cable according to the conventional example is 300 degrees.
℃ or less, there is a problem that it cannot be used, for example, around a blast furnace, a converter or a line of a steelworks. Here, there is also a method of wiring the above-mentioned heat-resistant coaxial cable in a water-cooled pipe, but there is a problem that piping work including water piping is troublesome, and furthermore, there is a fear of water leakage due to aging. The present invention has been made in view of such circumstances, and has as its object to provide a heat-resistant coaxial cable that can be used at a higher temperature than a conventional heat-resistant coaxial cable using a resin.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The heat-resistant coaxial cable described above has a core wire inside a heat-resistant thin-walled metal tube whose longitudinal section is corrugated and formed into a bellows via a heat-resistant insulating member made of a collection of linear materials or a plurality of circular plate materials. Is provided. The heat-resistant coaxial cable according to claim 2 is the heat-resistant coaxial cable according to claim 1, wherein a peak portion of the heat-resistant thin-walled metal tube and a valley portion adjacent thereto are spirally formed, and The insulating member is made of a plurality of circular plate members having substantially the same diameter as the inner diameter of the valley of the heat-resistant thin metal tube. The heat-resistant coaxial cable according to claim 3 is the heat-resistant coaxial cable according to claim 1, wherein the ridge portion and the valley portion adjacent to the ridge portion of the heat-resistant thin-walled metal tube are each annular, and the circular heat-resistant coaxial cable is circular. The insulating member is larger than the inner diameter of the valley and smaller than the inner diameter of the peak. The heat-resistant coaxial cable according to claim 4 is the heat-resistant coaxial cable according to claim 2 or 3, wherein the core wire wired between the adjacent circular plate members is covered with one or two or more small diameter short tubes. Have been. The heat-resistant coaxial cable according to claim 5 is the heat-resistant coaxial cable according to claim 1, wherein the heat-resistant insulating member is formed of a set of straight members, and is woven continuously or at a predetermined pitch in the core wire. I have.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a front sectional view of a heat-resistant coaxial cable according to a first embodiment of the present invention, FIG. 2 is a sectional side view of the same, and FIG. 3 is a heat-resistant coaxial cable according to a second embodiment of the present invention. FIG. 4 is a front sectional view of the coaxial cable, FIG. 4 is a sectional view of the same side, FIG. 5 is a front sectional view of a heat-resistant coaxial cable according to the third embodiment of the present invention, and FIG.

As shown in FIGS. 1 and 2, a heat-resistant coaxial cable 10 according to an embodiment of the present invention has a heat-resistant thin-walled metal tube 11 and a heat-resistant thin metal tube 11 arranged at a predetermined interval inside the metal tube. An example of an insulating member, a mica plate made of a circular plate material (other insulating ceramic plates may be used) 12
And a core wire 13 arranged at the center of the heat-resistant thin metal tube 11, and a small-diameter short tube 14 covering the core wire 13 between the mica plates 12. Hereinafter, these will be described in detail.

The heat-resistant thin-walled metal tube 11 is made of a stainless steel thin-walled tube, which is an example of a heat-resistant metal, and its longitudinal section is corrugated, and the peaks 15 and the valleys 16 are spiraled. It can be bent in a free direction with a radius of curvature. The diameter of the heat-resistant thin-walled metal tube 11 is preferably selected in a range of about 10 to 50 mm, but the present invention is not limited to this numerical value and is selected according to the application. Therefore, it is preferable that the thickness of the heat-resistant thin-walled metal tube 11 is also selected in the range of about 0.1 to 1.5 mm.

The mica plate 12 has a thickness of 0.5 to 2 mm.
A thin mica plate material is processed into a circular shape, and its diameter is substantially the same as the inner diameter of the valley portion 16. Thereby, the mica plate 12 can be easily inserted into the heat-resistant thin-walled metal tube 11 as shown in FIG.
The mica plate 12 is supported in contact at several places. In addition,
In this embodiment, the mica plate 12 is inserted between 2 and 3 pitches with respect to the corrugated shape of the heat-resistant thin-walled metal tube 11, but may be 1 pitch or even 3 pitches or more. The present invention applies.

An insertion hole is provided at a center position of the mica plate 12, and a core wire 13 made of silver or copper is inserted therethrough.
The core wire 13 between the adjacent mica plates 12 has a small diameter short pipe 14.
Is installed. The small diameter short tube 14 is preferably made of an insulator tube made of a porcelain material, and its entire length is shorter than the distance between the adjacent mica plates 12 minus the thickness of the mica plates 12, or a shorter range. Has become. As a result, the mica plate 12 and the small-diameter short tube 14 are alternately inserted through the core wire 13, and then inserted into the heat-resistant thin-walled metal tube 11 that has been subjected to corrugated processing (bellows processing). 12 can be set. The present invention is also applicable to a case where a metal tube is used for the small-diameter short tube 14.

[0010] The heat-resistant coaxial cable 10 constructed as described above comprises an inner core wire 13 and an outer heat-resistant thin-walled metal tube 1.
Since 1 is in an insulated state, it can be used as a coaxial for transmitting a signal or the like. In this case, since the heat-resistant thin-walled metal tube 11 is corrugated, it can be bent freely as long as it has a radius of curvature equal to or more than a certain radius of curvature, whereby the wiring can be liberalized. Further, the heat-resistant coaxial cable 10
Since all materials have heat resistance, they can be used even in a high-temperature atmosphere. Further, in assembling, since the small diameter short tube 14 is provided on the core wire 13, the distance between the respective mica plates 12 can be set.
2 can be easily charged. The peak 15 and the valley 16
The waveform processing may be one or more.

Next, a heat-resistant coaxial cable 20 according to a second embodiment of the present invention will be described with reference to FIGS. The same components as those of the heat-resistant coaxial cable 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted (the same applies hereinafter). As shown in FIGS. 3 and 4, the heat-resistant coaxial cable 20 is an example of a heat-resistant thin-walled metal tube 21 and a heat-resistant insulating member disposed at a predetermined interval inside the metal tube 21, and is a mica plate made of a circular plate material. 22, a core wire 13 arranged at the center of the heat-resistant thin metal tube 11, and a core wire 1 between each mica plate 22.
3 for covering each of them. Hereinafter, these will be described in detail.

The heat-resistant thin-walled metal tube 21 is made of a stainless steel thin-walled tube, which is an example of a heat-resistant metal, and is subjected to a corrugated process in which annular ridges 23 and valleys 24 are alternately and continuously provided. It can be bent freely in a radius. The diameter of the heat-resistant thin-walled metal tube 11 is preferably selected in a range of about 10 to 50 mm, but the present invention is not limited to this number and is selected according to the application. Therefore, it is preferable that the thickness of the heat-resistant thin-walled metal tube 11 is also selected in the range of about 0.1 to 1.5 mm.

The mica plate 22 has a thickness of 0.5 to 2 mm.
A thin mica plate material processed into a circular shape has a certain degree of flexibility, and its diameter is larger than the inner diameter of the valley 24 and smaller than the inner diameter of the peak 23. Thereby, as shown in FIG. 3, the mica plate 22 can be held at a predetermined position by being inserted inside the crest 23. Here, it is difficult to insert the mica plate 22 when the difference between the inner diameters of the ridges 23 and the valleys 24 is too large. For example, the inner diameter of the valleys 24 is about 5 to 30% of the inner diameter of the ridges 23. It is preferable to set it between. In this embodiment, the mica plate 22 is attached to the large-diameter portion of the heat-resistant thin-walled metal tube 21.
Although it is inserted for each pitch, it may be one pitch, and the present invention is applied to a case of three or more pitches depending on the case.

An insertion hole is provided at the center of the mica plate 22, and a core wire 13 made of silver or copper is inserted therein. A small-diameter short tube 14 is mounted on the core wire 13 between the adjacent mica plates 22. I have. The heat-resistant coaxial cable 20 configured as described above includes the inner core wire 13 and the outer heat-resistant thin metal tube 2.
Since 1 is in an insulated state, it can be used as a coaxial for transmitting a signal or the like. In this case, since the heat-resistant thin-walled metal tube 21 is corrugated, it can be bent freely as long as it has a radius of curvature equal to or more than a predetermined radius of curvature. Further, the heat-resistant coaxial cable 20
Since all materials have heat resistance, they can be used even in a high-temperature atmosphere.

Next, a heat-resistant coaxial cable 30 according to a third embodiment of the present invention will be described with reference to FIGS. And a core wire 32 inserted therein, and a heat-resistant fiber 33 which is an example of a heat-resistant insulating member in which the fibers are radially arranged around the core wire 32 continuously or at a predetermined pitch. I have. As for the heat-resistant thin metal tube 31, the heat-resistant thin metal tube 21 according to the second embodiment is used.
(Or the heat-resistant thin-walled metal tube 11 according to the first embodiment)
Therefore, the detailed description is omitted. The heat-resistant fiber 33 uses a core wire 32 in which a plurality of wires (copper, silver, brass, etc.) are stranded, and sandwiches a thin linear material (for example, alumina fiber, glass fiber, etc.) with a predetermined length between the core wires 32. It is sandwiched in a state, and is radiated radially around the core wire 32 (that is, it is in a scalloped state). In addition,
The radius of the heat-resistant fiber 33 is substantially equal to or shorter than the inner diameter of the peak 23 and is larger than the inner diameter of the valley 24.

Since the heat-resistant coaxial cable 30 has the above-described structure, it is extremely easy to assemble it. The heat-resistant fiber 33 is attached to the core wire 32 and the heat-resistant coaxial cable 30 is inserted into the heat-resistant thin metal tube 31. Since the core wire 32 is insulated from the surrounding heat-resistant thin-walled metal tube 31, it functions as a coaxial cable.

In the above embodiment, stainless steel is used as the material of the heat-resistant thin metal tube, but the present invention is applicable to other heat-resistant metal materials (heat-resistant alloy, titanium, etc.). In the first and second embodiments,
Although the small diameter short tube was used, the small diameter short tube can be omitted by fixing the mica plate at a predetermined position of the core wire. Furthermore, the present invention is also applicable to a case where a ventilation hole is provided in a circular plate made of a mica plate or the like and cooling air is flown in a heat-resistant thin metal tube.

[0018]

As described above, the heat-resistant coaxial cable according to any one of claims 1 to 5 has a core wire provided in a heat-resistant thin-walled metal tube via a heat-resistant insulating member. Can be used up to higher temperatures than the coaxial cable used. In addition, since the heat-resistant thin-walled metal tube subjected to the corrugation processing is used, the heat-resistant coaxial cable in a high-temperature atmosphere can be bent to some extent freely. Furthermore, since most of the space between the core wire and the outer heat-resistant coaxial cable is air, the dielectric constant is low and the high-frequency characteristics are excellent. In particular, in the heat-resistant coaxial cable according to the second aspect, since the peaks and the valleys adjacent to the peaks of the heat-resistant thin-walled metal tube are formed in a spiral shape, the molding is easy and the heat-resistant insulation is provided. The members are
Since it is composed of a plurality of circular plate members having substantially the same diameter as the inner diameter portion of the heat-resistant thin-walled metal tube, charging is extremely easy. In the heat-resistant coaxial cable according to the third aspect, the heat-resistant insulating member comprises a plurality of circular plate members, and the circular plate members are fitted into and supported by the inner portions of the annular ridges of the heat-resistant thin-walled metal tube. As a result, a highly reliable heat-resistant coaxial cable can be provided with little movement of the circular plate inside. In the heat-resistant coaxial cable according to the fourth aspect, since one or two or more small-diameter short tubes are provided on the core wire wired between the adjacent circular plate members, the pitch of the circular plate members is accurately determined. This makes the assembly extremely easy. Furthermore, even if the number of circular plates is reduced, there is no danger that the inner core wire will abut on the surrounding heat-resistant thin-walled metal tube. And Claim 5
In the described heat-resistant coaxial cable, the heat-resistant insulating member is made of a set of wires, and is woven continuously or at a predetermined pitch in the core wire, so that the assembling work of inserting the core wire into the heat-resistant thin-walled metal tube is easy. Becomes Also, since there is almost no possibility that the core wire will contact the outer heat-resistant thin metal tube,
Reliability is improved.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a heat-resistant coaxial cable according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the same.

FIG. 3 is a front sectional view of a heat-resistant coaxial cable according to a second embodiment of the present invention.

FIG. 4 is a sectional side view of the same.

FIG. 5 is a front sectional view of a heat-resistant coaxial cable according to a third embodiment of the present invention.

FIG. 6 is a sectional side view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Heat resistant coaxial cable 11 Heat resistant thin metal tube 12 Mica board (heat resistant insulating member) 13 Core wire 14 Small diameter short pipe 15 Crest 16 Valley 20 Heat resistant coaxial cable 21 Heat resistant thin metal tube 22 Mica board 23 Crest 24 Valley 30 Heat-resistant coaxial cable 31 Heat-resistant thin metal tube 32 Core wire 33 Heat-resistant fiber

Claims (5)

[Claims] A core wire is provided inside a heat-resistant thin-walled metal tube having a corrugated longitudinal section formed into a bellows shape via a heat-resistant insulating member made of a collection of straight members or a plurality of circular plate members. A heat-resistant coaxial cable. 2. The heat-resistant thin-walled metal tube has a crest portion and a valley portion adjacent to the crest portion formed in a spiral shape, and the heat-resistant insulating member has an inner diameter substantially equal to the inner diameter of the valley portion of the heat-resistant thin-walled metal tube. The heat-resistant coaxial cable according to claim 1, comprising a plurality of circular plates having the same diameter. 3. The peak of the heat-resistant thin-walled metal tube and the valley adjacent thereto are each formed in an annular shape, and the circular heat-resistant insulating member is larger than the inner diameter of the valley and is larger than the inner diameter of the peak. The heat-resistant coaxial cable according to claim 1, wherein the cable is reduced in size. 4. The heat-resistant coaxial cable according to claim 2, wherein the core wire wired between the adjacent circular plate members is covered with one or two or more small diameter short tubes. 5. The heat-resistant coaxial cable according to claim 1, wherein the heat-resistant insulating member is made of a set of straight members and is woven continuously or at a predetermined pitch into the core wire.