JPH11287714A - Protective tube for cable insertion, protective tube structure body, and thermocouple using the protective tube structure body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective tube structure body capable of bending cables in any direction without applying an excessive force to the cables and generating disconnection, in a protective tube in which at least two holes for inserting a plurality of cables are formed. SOLUTION: Holes 3a, 3b for inserting cables (a), (b) are formed at mutually displaced angles in a protective tube 1. Holes 4a, 4b for cable insertion are formed parallel with each other in the longitudinal direction in long protective tubes 2i, 2j. The protective tube 1 is inserted in the part between the long protective tubes 2i and 2j. The cable (a) and (b) are inserted in the holes 3a, 3b and holes 4a, 4b, respectively. Between the long protective tube 2i and the protective tube 1, the cables (a), (b) are arranged in the Y axis direction, so that a protective tube structure body can be easily bent in the X axis direction. Between the protective tube 1 and the long protective tube 2j, the cables (a), (b) are arranged in the X axis direction, so that the protective tube structure body can be easily bent in the Y axis direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective tube and a protective tube structure for inserting a cable such as a wire which can be used for a thermocouple and the like, and a thermocouple using the protective tube structure. .

[0002]

2. Description of the Related Art Various types of thermocouples have been widely used for high temperature measurement. As shown in FIG. 9, this type of thermocouple is formed by welding one end of two thermocouple wires a and b of different materials to form a temperature measuring contact p, and connecting the other end to a voltmeter v. The measured voltage is determined by the temperatures T1 and T2 across the thermocouple wires a and b. Thermocouples are used by inserting wires into an insulating protective tube to prevent measurement errors due to contact between the wires. A protective tube made of a heat-resistant material having a high insulating property is used. These protection tubes are, as shown in FIG.
Inside the protective tube 101, at least two holes 102a, 102b into which the thermocouple wires a, b are respectively inserted are formed in the longitudinal direction in parallel with each other.

[0003] Depending on the object to be measured, the thermocouple may need to be installed by bending the thermocouple.
In such a case, as shown in FIGS. 11 and 12, a plurality of protective tubes 101i, 101j... Are connected in series, and a connecting portion of both protective tubes (for example, 101i and 101j) is bent and used. doing.

[0004]

By the way, in the conventional thermocouple as described above, depending on the direction in which the thermocouple is bent, an excessive force is applied to the strand of the thermocouple inserted into the inside of the protective tube, and the strand is twisted. Could be broken. For example,
As shown in FIG. 12A, two protection tubes 101 are provided.
In a thermocouple in which i and 101bj are connected in series, 2
In the case of bending in the X-axis direction perpendicular to the YZ plane formed by the strands a and b, it can be easily bent, but as shown in FIG. 12B, the YZ formed by the two strands a and b When bending in a plane, that is, when bending in the Y-axis direction parallel to the YZ plane, an excessive force is applied to the wire b, and there is a high risk of breaking the wire b, and it is difficult to bend. In addition, even if the wire is not broken, there is a problem that the internal stress is generated in the wire b, so that the electromotive force changes.

In view of this, in consideration of the plane in which the thermocouple is bent, the position of the plane formed by a plurality of strands is specified and arranged, or the space between the two protection tubes is sufficiently used. . However, when the arrangement of the thermocouple is limited, and when the interval between the two protection tubes is increased, the element wire of the thermocouple is etched by the atmospheric gas to be disconnected or carbon contained in the atmosphere adheres and short-circuits. Could be short-circuited at the bent part.

[0006] The above problems are not limited to thermocouples, but also in protective tubes such as signal lines and power supply wiring without similarly applying excessive force to signal lines and the like without further disconnection. There was a problem that it was not possible to bend freely in any direction.

The present invention has been made in view of the above-mentioned unsolved problems of the prior art, and has at least two or more holes through which a plurality of cables such as thermocouple wires or the like are inserted. In the formed protective tube, a protective tube and a protective tube structure for inserting a cable capable of bending a cable in any direction without applying excessive force to the cable or breaking the cable, and such a protective tube It is an object of the present invention to provide a thermocouple using a structure.

[0008]

In order to achieve the above object, the present invention provides a protective tube for protecting a cable by inserting a cable into a plurality of holes formed therein. Are formed so as to be angularly displaced inside the protection tube.

In the protective tube of the present invention, the direction in which the plurality of holes are arranged is preferably different in each cross section in the longitudinal direction of the protective tube, and a plurality of protective tubes are connected in series. Is preferred.

Further, the protective tube structure according to the present invention connects the protective tube according to claim 1 or 2 with a protective tube in which a plurality of cable insertion holes are formed in the longitudinal direction in parallel with each other. In addition, a cable is inserted into each of a plurality of holes which communicate with each other in these protective tubes.

Furthermore, the thermocouple of the present invention is characterized in that
Alternatively, a thermocouple wire as a cable is inserted into a hole in the protective tube structure using the protective tube structure according to item 5.

[0012]

According to the protective tube and the protective tube structure of the present invention,
A protective tube formed by angularly displacing a hole for inserting a cable such as a thermocouple wire inside is inserted between other protective tubes formed with a cable insertion hole parallel to the longitudinal direction. By inserting the cable and inserting the cable into the cable insertion holes, the cable is connected between the protection tube and another protection tube.
In a portion where the protective tube structure is easily bent in the X-axis direction in a portion where the protective tube structure is arranged in the axial direction, and in a portion where the cables are aligned in the X-axis direction between the protective tube and another protective tube. In addition, the protective tube structure can be easily bent in the Y-axis direction, and can be easily bent in any direction without applying excessive force to a plurality of cables or breaking the cables. Furthermore, by using a plurality of protective tubes formed by displacing a plurality of holes angularly, it is possible to bend more easily in any direction.

By using the above-described protective tube structure for a thermocouple, the thermocouple can be used by appropriately bending the thermocouple. In addition, the breakage of the thermocouple wire and the change in electromotive force can be prevented. , Stable temperature measurement becomes possible,
Further, the length of the wires exposed between the protection tubes is also reduced, so that the wires are not cut by etching by the atmospheric gas or short-circuited due to the adhesion of carbon contained in the atmosphere.

[0014]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a part of a thermocouple to which an embodiment of a protection tube according to the present invention is applied, and FIG. 2 shows the protection tube shown in FIG. 3 (b) and 3 (c) are a left side view, a front view and a right side view of the protection tube, respectively. FIGS. 3 (a) and 3 (b) are thermoelectric tubes to which an embodiment of the protection tube according to the present invention is applied. It is a perspective view showing the state where a pair was bent in the direction of the X-axis and the direction of the Y-axis via a protection tube, respectively. In the following description, a protection tube for a thermocouple wire will be mainly described. However, the present invention is not limited to a protection tube for a thermocouple wire, and various cables such as a signal line and a wiring for power supply may be used. It is needless to say that the present invention can be applied to the protection tube.

In FIG. 1, reference numeral 1 denotes a protective tube according to the present invention, and 2 (2i, 2j) denote a protective tube similar to a conventionally used protective tube (hereinafter, this protective tube is distinguished from the protective tube 1). And a and b are thermocouple wires as cables, respectively. Protection tube 1
Is inserted between the two long protection tubes 2i and 2j, and a hole 3 (3) described later formed in each of the protection tubes 1, 2i and 2j.
a, 3b) and 4 (4a, 4b) are inserted with wires a and b to form a thermocouple. As shown in FIG. 2, the protection tube 1 is formed with two holes 3a and 3b for inserting wires, and the holes 3a and 3b for inserting wires are formed on the left end face of the protection tube 1. 2, as shown in FIGS. 2 (a) and 2 (b), there is a positional relationship vertically arranged in the Y-axis direction, and at the other right end face, as shown in FIGS. 2 (b) and 2 (c). As shown in the figure, the inside of the protection tube 1 is 90
Degrees. That is, the two holes 3a and 3b are displaced such that the arrangement direction of the holes 3a and 3b in each cross section (XY plane) in the longitudinal (Z-axis) direction of the protective tube 1 changes the angle sequentially and rotates. . The long protection tube 2 (2i and 2j) has the same structure as the conventional protection tube 101 as shown in FIG. 10, and two element wire insertion holes 4a and 4b are mutually connected. They are formed in parallel in the longitudinal direction.

The protective tube 1 having the above-described shape is interposed between the two long protective tubes 2i and 2j to constitute a protective tube structure as shown in FIG. That is, the direction in which the two holes 4a and 4b of the lower long protection tube 2i are arranged in parallel is Y.
The holes 3a and 3b on the lower end surface of the protection tube 1 are arranged in the Y-axis direction so as to correspond to the holes 4a and 4b of the long protection tube 2i, respectively.
The holes 3a and 3b on the upper end face of the protective tube 1 are displaced by 90 degrees in the X axis direction, and the holes 4a and 4b of the upper long protective tube 2j are holes on the upper end surface of the protective tube 1. The holes 4a and 4b of the upper long protective tube 2j are arranged so as to be aligned in the X-axis direction. The wires a and b are connected to the respective protection tubes 1,
Holes 3a and 3b and holes 4a and 4 formed in 2i and 2j
b.

When the thermocouple provided with the protective tube structure constructed as described above is bent in the X-axis direction, as shown in FIG. By bending between the lower long protective tube 2i and the protective tube 1 arranged in parallel with each other, the wires a and b can be bent without exerting an excessive force. When bending in the Y-axis direction, FIG.
As shown in FIG. 2B, by bending the wires a and b between the upper long protective tube 2j and the protective tube 1 arranged in parallel in the X-axis direction, the wires a and b are unreasonable. Can be bent without exerting force. Therefore, the thermocouple can be bent without exerting an excessive force on the strands a and b in any direction.

As a result, the wire is not broken or the electromotive force does not change, stable temperature measurement is possible, and the length of the wire exposed between the protection tubes is shortened. As a result, the wire is prevented from being disconnected by the etching and the carbon contained in the atmosphere is adhered, and the element wire is not short-circuited.

Next, a modification of the above-described embodiment is shown in FIG. In FIG. 4, the protective tube 1 is formed so that two element wire insertion holes 3a and 3b are respectively displaced by 90 degrees inside, similarly to the protective tube shown in FIG. 1 are formed obliquely on both sides of each end face, that is, in the left end face of the protective tube 1, as shown in FIGS. 4A and 4B, two holes 3a are formed. Inclined surface 5 having sides parallel to the arrangement direction of 3 and 3b,
4 are formed on both sides, and as shown in FIGS. 4B and 4C, an inclined surface 6 having a side parallel to the direction in which the two holes 3a and 3b are arranged at the right end face. ,
6 are formed on both sides. In addition, the long protective tube 2 (2i,
2j), as shown in FIGS. 4 (d), (e) and (f), two element wire insertion holes 4a and 4b are formed in the longitudinal direction in parallel with each other, Both sides of each end face are formed diagonally, and each end face is formed on each side with inclined faces 7, 7 having sides parallel to the direction in which the two element wire insertion holes 4a and 4b are arranged.

The protective tube 1 and the long protective tube 2 (2i, 2j) having such shapes are arranged in the same manner as in the embodiment shown in FIG. 1, and the holes 3a formed in the respective protective tubes 1, 2i, 2j. And 3b
The wires a and b are similarly inserted through the holes 4a and 4b, respectively. Then, similarly to the embodiment shown in FIG. 3, the thermocouple composed of these protective tube structures is moved in the X-axis direction or in the Y-axis direction.
When bending in the axial direction, the protection tube 1 and the long protection tube 2 (2i,
2j) Each end face in the bending direction is partially removed to form an inclined surface, so that the holes 3a and 3b of the protection tube 1 are formed.
The holes 4a and 4b of the long protective tube 2 are close to each other and can be easily bent as compared with the embodiment shown in FIGS. 1 and 3, and the element exposed between the protective tubes. The length of the line can be further reduced.

Next, a thermocouple to which another embodiment of the protection tube of the present invention is applied will be described with reference to FIGS.

In this embodiment, the outer shape of the protective tube and the long protective tube for inserting the wire as a cable is made elliptical to reduce their mass, and two holes for inserting the wire are formed in the inside thereof. I have. The elliptical long protective tube 12 (1
2i, 12j) correspond to (a), (b) and (c) in FIG.
As shown in the figure, two holes 14a, 14
b are arranged in parallel in the major axis direction of the ellipse and are formed in parallel with each other in the longitudinal direction, and the protective tubes 11 (11i, 11j)
As shown in FIGS. 6 (d), (e) and (f),
It has an elliptical shape of the same size as the long protection tube 12, and has two protection tubes 11i and 11j interposed in series between the long protection tubes 12i and 12j.
1j each have two holes 13 for cable insertion.
a and 13b are formed, and the protection tubes 11i and 11j are formed.
The holes 13a and 13b formed in FIG.
As shown in (e) and (f), on the left end surface, along the elliptical long axis (Y axis) direction (in the vertical direction)
(D) and (e) in FIG. 6, and the other right end face is aligned (horizontally) along the elliptical minor axis (X-axis) direction (see FIG. 6). 6 (e) and (f)), the protection tubes 11i, 11
j are respectively displaced by 90 degrees.

The protective tubes 11i, 11 having such a shape
j, the long protective tubes 12i and 12j, and the wires a and b as two cables are assembled as shown in FIG.
That is, two elliptical protective tubes 11i and 11j are inserted in series between the two elliptical long protective tubes 12i and 12j. In addition, the upper and lower long protective tubes 12i, 12j
When the long axis direction of the ellipse is the Y axis direction, the long protective tube 12
The two holes 14a and 14b i and 12j are arranged in the Y-axis direction. The two protection tubes 11i and 11j are arranged such that end faces (end faces illustrated in FIG. 6F) in which the holes 13a and 13b are arranged in the elliptical short axis (X-axis) direction face each other. . The wires a and b are inserted through the holes 13a and 13b and the holes 14a and 14b formed in the respective protection tubes arranged as described above. As a result, as shown in FIG. 5, the wires a and b inserted into the holes 14a and 14b which are arranged in parallel in the elliptical long axis (Y-axis) direction of the lower long protective tube 12i are connected to the protective tubes. Elliptical long axis (Y
Into the holes 13a, 13b opened in parallel in the (axial) direction, and displaced by 90 degrees inside the protective tube 11i,
At the upper end surface of the protective tube 11i, holes 13a and 13b are opened in parallel in the elliptical short axis (X-axis) direction.
The holes enter the holes 13a, 13b arranged in the direction of the elliptical minor axis (X-axis) on the lower end surface of the protective tube 11j, are displaced 90 degrees inside the protective tube 11j, and have the elliptical long axis (Y
Holes 13a and 13b aligned in the direction of the ellipse, and the holes 1a aligned in the direction of the elliptical long axis (Y axis) in the upper long protective tube 12j.
4a, 14b, and the hole 14 of the upper protective tube 12j
a, 14b.

In the protective tube assembly constructed as described above, when bending in the X-axis (elliptical short axis) direction, the lower wire where the strands a and b are arranged in the Y-axis (elliptical long axis) direction. By bending between the long protection tube 12i and the protection tube 11i, or between the protection tube 11j and the upper long protection tube 12j, the wires a and b can be bent without applying excessive force. . In the case of bending in the Y-axis (elliptical long axis) direction, the two wires a and b are bent between the protective tube 11i and the protective tube 11j arranged in the X-axis (elliptical short axis) direction. The wires a and b can be bent without excessive force. Therefore, as described above, the cables a and b can be easily bent in both the X-axis direction and the Y-axis direction without applying excessive force to the cables a and b.

Further, some other embodiments of the present invention will be described. In the above-described embodiment, the cable insertion holes formed in the protection tube and the long protection tube have been described and illustrated as having a circular cross section, but as shown in FIG. Shaped hole 23a,
23b can also be formed, and although not shown, a plurality of holes having an elliptical cross section can be formed in a protective tube having an elliptical cross section. Further, as shown in FIG. 8, three or more holes 33a, 33b, 33c are formed in the protective tube 31.
Can be formed and used.

In the above-described protective tube,
Although the cable insertion hole is displaced by 90 degrees in the protective tube, this displacement angle may be set to various angles such as 45 degrees other than 90 degrees. In this case, the protection is performed by displacing the hole to a certain angle. By connecting a plurality of tubes so that they can be bent at an appropriate connecting portion, it is possible to bend in various arbitrary directions. Further, the cable insertion hole of the protection tube can be displaced by 360 degrees or more, and the protection tube is cut or folded at an appropriate place depending on the bending direction. At this time, it is convenient to attach a mark in accordance with the displacement angle or a mark in the bending direction on the outside of the protective tube so that the cut or folded portion can be immediately identified according to the bending direction.

The protective tube having such a hole whose angle is displaced inside can be manufactured as follows. First,
After passing a string of pulp or polymer equivalent to the hole diameter into a rod of raw material powder or clay, and twisting the rod of raw material or clay together with the pulp or polymer inside by a desired angle, these By sintering the rod at a high temperature, the pulp and the like inside are ashed, easily removed from the rod, and a protective tube having a hole displaced at a desired angle can be obtained.

As a cable to be inserted into the protective tube, there are a signal line and a power supply wiring in addition to the strand of the thermocouple, and the same operation and effect can be obtained by using any cable. it can.

[0030]

As described above, according to the protection tube and the protection tube structure of the present invention, a plurality of holes for inserting and protecting cables such as thermocouple wires are angularly displaced. By using the protective tube formed by doing so, it is possible to easily bend in any direction without applying excessive force to a plurality of cables or breaking the cables,
By using a plurality of protective tubes formed by angularly displacing a plurality of cable insertion holes, it is possible to bend in any direction more easily.

Further, by using the protective tube structure as described above for a thermocouple, the thermocouple can be bent and used. In addition, the breakage of the thermocouple wire and the change in electromotive force can be prevented. Temperature, stable temperature measurement is possible, and the length of the wire exposed between the protection tubes is shortened.The wire is short-circuited due to disconnection due to etching by atmospheric gas or carbon contained in the atmosphere adhering. Without having to do it.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a part of a thermocouple to which an embodiment of a protection tube of the present invention is applied.

FIGS. 2A and 2B show the protection tube shown in FIG.
And (c) are a left side view, a front view, and a right side view of the protection tube, respectively.

FIGS. 3A and 3B are perspective views showing a state where the thermocouple shown in FIG. 1 is bent in the X-axis direction and the Y-axis direction via a protection tube.

FIG. 4 shows a modified example of the protection tube and the long protection tube of the present invention, wherein (a), (b) and (c) are left side views of the protection tube;
It is a front view and a right side view, and (d), (e) and (f) are a left side view, a front view, and a right side view of the long protection tube.

FIG. 5 is a perspective view illustrating a part of a thermocouple to which another embodiment of the protection tube of the present invention is applied.

6 shows the protection tube and the long protection tube shown in FIG. 5,
(A), (b) and (c) are a left side view, a front view and a right side view of the long protection tube, and (d), (e) and (f) are a left side view and a front view of the protection tube. And a right side view.

FIG. 7 shows a protection tube according to still another embodiment of the present invention;
(A), (b) and (c) are a left side view, a front view, and a right side view of the protection tube, respectively.

FIG. 8 shows a protection tube according to another embodiment of the present invention, wherein (a),
(B) and (c) are a left side view, a front view, and a right side view of the protection tube, respectively.

FIG. 9 is a schematic diagram of a thermocouple for explaining the principle of the thermocouple.

FIG. 10 shows a protection tube used for a conventional thermocouple, and (a), (b) and (c) are a left side view, a sectional view and a right side view of the protection tube, respectively.

FIG. 11 is a perspective view showing a relationship between a thermocouple element wire and a plurality of protective tubes in a conventional thermocouple.

12A and 12B are perspective views of a thermocouple for explaining a problem that occurs when a conventional thermocouple is bent, where FIG. 12A is a state where the thermocouple is bent in an X-axis direction, and FIG. It is in a bent state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protective tube 2 (i, j) Long protective tube 3 (a, b) Hole 4 (a, b) Hole 5, 6, 7 Inclined surface 11 (i, j) Protective tube 12 (i, j) Long protective tube 13 (a, b) hole 14 (a, b) hole 21 protective tube 23 (a, b) hole 31 protective tube 33 (a, b, c ...) hole a, b thermocouple element (cable)

Claims (6)

[Claims] 1. A protection tube for protecting a cable by inserting the cable into a plurality of holes formed therein.
A protection tube, wherein the plurality of holes are formed so as to be angularly displaced inside the protection tube. 2. The protection tube according to claim 1, wherein the direction in which the plurality of holes are arranged is different in each cross section in the longitudinal direction of the protection tube. 3. A protection tube comprising a plurality of the protection tubes according to claim 1 connected in series. 4. The protective tube according to claim 1, wherein the protective tube is formed by connecting a plurality of cable insertion holes in a longitudinal direction in parallel with each other, and a plurality of holes communicating with each other. A protective tube structure characterized in that a cable is inserted through each of them. 5. The protection tube according to claim 3, which is connected to a protection tube in which a plurality of cable insertion holes are formed in the longitudinal direction in parallel with each other, and a plurality of cables are respectively connected to the plurality of holes which communicate with each other. A protective tube structure characterized by passing through. 6. A thermocouple using the protective tube structure according to claim 4 or 5, wherein a thermocouple wire as a cable is inserted into a hole in the protective tube structure.