JP2003339114A - Wiring connection sleeve, wiring connecting structure, and wiring connection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability in connecting wirings which are used under severe conditions, such as high temperature conditions. <P>SOLUTION: This sleeve is the wiring connection sleeve 3 for connecting between MI cables 1, 2, includes a sleeve body 4 and a sleeve lid 5 for forming a closed space, and an insertion guide tube 4a mounted on the sleeve 4, in which the connected MI cables 1, 2 are inserted, and permits a connecting section of the MI cables 1, 2 to be stored in the closed space. Thus, even if it is used under severe conditions, such as the high temperature conditions, reliability of connecting the MI cables 1, 2 can be enhanced. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring connecting sleeve and a wiring connecting structure, and more particularly to a wiring connecting sleeve and a wiring connecting structure used under severe conditions such as high temperature.

[0002]

2. Description of the Related Art When arranging electric wiring such as a thermocouple inside a device such as a gas turbine or a steam turbine, a MI cable (Mineral Insulated Cabl) is used to withstand high temperatures.
The wiring called e) is commonly used.

[0003] The MI cable is made by inserting a wire of nickel, copper or the like into a stainless steel (SUS304 etc.) tube and filling the tube with magnesium oxide (MgO). The diameter of the tube is about f0.5 to f4.8. By filling magnesium oxide around the wire, it is configured to withstand high temperatures.

When placing MI cables in a turbine, it is necessary to adapt the length of the cables to the structure in which they are placed. Therefore, the MI cable is appropriately cut and connected at a necessary portion.

FIG. 6 is a schematic cross-sectional view showing a connection structure of a conventional MI cable, showing a connection structure of an MI cable and a normal cable (soft cable) 102.
In the connection structure shown in FIG. 6, the MI cable 101 to be connected is connected.
The wire 101a is pulled out from the cable and connected to the soft cable 102 by a method such as silver brazing. Then, the connecting portion is passed through a sleeve 103 made of stainless steel or the like, and an adhesive 104 having high heat resistance is filled and fixed inside the sleeve 103.

[0006]

However, in the conventional connection structure as shown in FIG. 6, the adhesive 104 in the sleeve 103 comes into contact with the outside air. When the MI cables 101 are connected to each other in the structure shown in FIG. 6 and placed under severe conditions such as a high temperature of about 300 ° C. inside the steam turbine, there is a problem that reliability is deteriorated.

That is, when the connecting portion of the MI cable 101 is placed in a high temperature steam atmosphere, the steam is generated by the adhesive 104.
There has been a problem that the reliability of the electrical connection of the wiring is deteriorated by entering the inside or the gap between the adhesive 104 and the sleeve 103.

When high-temperature steam enters the vicinity of the connecting portion of the wire 101a, the insulation drop of the wire 101a occurs, causing noise in the current flowing through the wire 101a. Therefore, there has been a problem that the S / N ratio of the current is lowered. This causes a problem that the reliability of the electric signal transmitted / received by the MI cable 101 is deteriorated.

FIG. 7 shows an example in which two sleeves 103 are used to cover the connecting portion of the wire 101a in order to prevent the entry of high temperature steam. In this way, by facing the sleeves 103, it is possible to prevent high temperature steam from entering the connection portion.

However, in the example of FIG. 7, the sleeve 10
After facing each other, the adhesive 104 is attached to the sleeve 103.
There is a problem that it cannot be filled inside. Therefore, the wire 1
The connection portion of 01a contacts the inner diameter of the sleeve 103 and causes a short circuit. In particular, when the MI cable 101 is arranged on a moving structure such as rotating or reciprocating, the sleeve 103
There is a high possibility that the inner wire 101a moves and comes into contact with the sleeve 103. As a result, the reliability of the electrical connection of the MI cable 101 may be reduced.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to improve reliability by surely connecting wirings used under severe conditions such as high temperature. And

[0012]

[Means for Solving the Problems] From the above viewpoints,
The present invention is a wiring connection sleeve for connecting wirings to each other, which comprises at least two members constituting the sleeve and forming a sealed space in the sleeve,
A wiring connection sleeve, comprising: an insertion portion that is provided on at least one of the members and into which the wiring to be connected is inserted, and stores the connection portion of the wiring in the sealed space. The connection part of the wiring can be stored in a closed space so that the influence of the environment on the connection part of the wiring can be minimized even in a harsh environment such as high temperature steam.

Further, the present invention is a wiring connecting sleeve in which the sealed space is filled with an adhesive. An adhesive was filled so that the connection portion of the wiring could be fixed in the closed space. As the adhesive, various kinds can be used as long as they are fluid and harden.

Further, the present invention is the wiring connecting sleeve, wherein at least one of the members is a bottomed cylinder, and the other member is a lid that closes the cylinder to form the sealed space. The bottomed cylinder and the lid were brought into close contact with each other so that the sealed space could be reliably constructed. The shape of the cylinder is not limited to the cylinder, and various shapes can be used.

The present invention is also a wiring connecting sleeve in which the insertion portion is provided at the bottom of the bottomed cylinder. By providing the insertion portion at the bottom of the cylinder, the wiring inserted from the insertion portion can be arranged in the cylinder in the longitudinal direction, and the space for the connection portion of the wiring can be secured in the sealed space.

Further, the present invention is the wiring connecting sleeve, wherein the insertion portion is a pipe extending from the closed space to the outside. By configuring the insertion part with a tube, the inserted wiring can be reliably held.

The present invention is also a wiring connecting sleeve in which another cylinder is inserted between the bottomed cylinder and the lid. After connecting the wires inserted in the bottomed tube, by attaching another tube to the bottomed tube, it became possible to fill the adhesive without storing the wiring connection part in the bottomed tube .

Further, the present invention is a wiring connecting sleeve in which a gap between the members is sealed. By sealing the gap, the airtightness of the closed space can be improved. As a sealing method, a method of using a sealing material such as packing or a gasket, a method of fixing by pouring silver wax, or the like can be used. Here, according to the brazing, it is possible to seal a fine gap by pouring and to improve heat resistance at high temperature.

Further, the present invention has a structure for connecting wirings to each other and is inserted into at least two members forming a closed space and an insertion portion provided on one of the members toward the closed space. A wiring connection structure including wiring connected in the closed space and an adhesive filled in the closed space. The connection part of the wiring can be stored in a closed space so that the influence of the environment on the connection part of the wiring can be minimized even in a harsh environment such as high temperature steam.

The present invention also provides a wiring connection structure in which the wiring is an MI cable. By using the MI cable, the heat resistance of the wiring itself can be improved.

Further, the present invention is the wiring connection structure in which at least one of the members is a bottomed cylinder, and the other member is a lid that closes the cylinder to form the closed space.
The closed space can be reliably constructed from the bottomed cylinder and lid. The shape of the cylinder is not limited to the cylinder, and various shapes can be used.

Further, the present invention is a wiring connection structure in which the insertion portion is provided at the bottom of the bottomed cylinder. By providing the insertion portion at the bottom of the cylinder, the wiring inserted from the insertion portion can be arranged in the cylinder in the longitudinal direction, and the space for the connection portion of the wiring can be secured in the sealed space.

The present invention is also the wiring connection structure in which the insertion portion is a pipe extending from the closed space to the outside of the closed space. By configuring the insertion part with a tube,
The inserted wiring can be held securely.

The present invention also provides a wiring connection structure in which another cylinder is inserted between the bottomed cylinder and the lid. After connecting the wires inserted in the bottomed tube, by attaching another tube to the bottomed tube, it became possible to fill the adhesive without storing the wiring connection part in the bottomed tube .

Further, the present invention is a wiring connection structure in which a gap between the members is sealed. By sealing the gap, the airtightness of the closed space can be improved. As a sealing method, a method of using a sealing material such as packing or a gasket, a method of fixing by pouring silver wax, or the like can be used.

Further, the present invention is a method for connecting wirings to each other, wherein the wirings to be connected are inserted into the cylinder from the insertion portion of the cylinder bottom, the tip of the wiring is taken out of the cylinder as it is, and the tip of the wiring is The connection is made outside the cylinder, the connection part is returned to the inside of the cylinder and stored, and the cylinder is filled with an adhesive while the connection part inside the cylinder is stored, and the cylinder is covered after the adhesive is filled. Is a wiring connection method in which a cylinder is attached and the inside of the cylinder is sealed. Since the wires are connected at the tips and the connection part is stored inside the cylinder and then the adhesive is filled and the lid is attached, the connection part can be stored in the sealed space and the adhesive material can be surely filled in the sealed space. I did it.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below. Further, the constituent elements of this embodiment include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

(Embodiment 1) FIGS. 1 and 2 are schematic views showing Embodiment 1 of the present invention. Here, FIG. 1 is an external view of a wiring connection structure according to the first embodiment, and FIG. 2 is a cross section. The first embodiment connects two MI cables 1 and 2 via a sleeve 3, and this connection structure is particularly suitable for use under severe conditions such as in high temperature steam. As shown in FIG. 1, the two MI cables 1 and 2 are inserted into the sleeve 3 and electrically connected in the sleeve 3. The sleeve 3 has a cylindrical shape, and
The MI cables 1 and 2 are inserted into the sleeve 3 from one end surface side of the sleeve 3.

As shown in FIG. 2, the sleeve 3 is composed of a sleeve body 4 and a sleeve lid 5. A female screw is formed on the inner diameter of the sleeve body 4, and a male screw is formed on the outer diameter of the sleeve lid 5. The sleeve body 4 and the sleeve lid 5 are securely fixed by engaging these screws. As shown in FIG. 2, the sleeve body 4
Two insertion guide tubes 4a are provided on the end surface on the side where the MI cables 1 and 2 are inserted. Insertion guide tube 4
The inner diameter of a is almost equal to the outer diameter of MI cables 1 and 2, and M
The I cables 1 and 2 are securely held by the sleeve body 4 by being inserted into the insertion guide tube 4a.

Two wires 1a and 2a are inserted through the MI cables 1 and 2, respectively. The wires 1a and 2a are M
The I-cables 1 and 2 are pulled out in advance by the length required for connection from the tips. The strand 1a and the strand 2a are connected inside the sleeve body 4. The wires 1a and 2a are connected by a method such as silver brazing. An adhesive 6 is filled in the sleeve body 4.
The connecting portion between the wires 1a and 2a has a sleeve body 4
Completely covered with adhesive 6 inside. As the adhesive 6, an adhesive that is fluidized and hardened, polyester-based, polyimide-based, phenol-based, epoxy-based, silica-based, ceramic-based, or the like is desirable. This connection structure is especially intended for use under severe conditions such as high temperature steam,
In order to fill the gap between the sleeve main body 4 and the sleeve lid 5 and to securely fix the sleeve main body 4 and the sleeve lid 5, both are fixed with a silver solder 7. Further, since the gap between the MI cables 1 and 2 and the insertion guide tube 4a is filled and fixed,
After all it is fixed with silver solder 7.

In the wiring connection structure of the first embodiment thus configured, the connecting portion between the wires 1a and 2a can be housed in the closed space inside the sleeve 3. Also, MI
Since the gaps between the cables 1 and 2 and the insertion guide tube 4a and the gap between the sleeve body 3 and the sleeve lid 5 are brazed with silver, the wires 1a and 2a are completely sealed from the outside air. it can. Therefore, even when used in high temperature steam, steam is suppressed from entering the sleeve 3,
It is possible to prevent the occurrence of insulation drop in the vicinity of the connection between the wires 1a and 2a due to the infiltration of steam. As a result, it is possible to suppress the generation of noise in the signals transmitted through the wires 1a and 2a.

Next, with reference to FIG. 3, the procedure of the method for connecting the MI cables 1 and 2 using the above-described wiring connection structure will be described. First, as shown in FIG.
Connect the MI cable 1 to the insertion guide tube 4a of the sleeve body 4,
Insert 2. At this time, the MI cables 1 and 2 are passed through the insertion guide tube 4a until the strands 1a and 2a at the tips of the MI cables 1 and 2 come out from the inside of the sleeve body 4. As a result, the wires 1a and 2 can be easily attached outside the sleeve body 4a.
It is possible to connect with a, and workability can be improved.

Next, as shown in FIG. 3 (b), the strand 1a
And the tip of the wire 2a are connected by a method such as silver brazing. Next, as shown in FIG. 3C, the wires 1 a and 2 a are moved toward the side where the MI cables 1 and 2 are inserted so that the connecting portions of the wires 1 a and 2 a are located inside the sleeve body 4. After that, MI cables 1 and 2 and insertion guide tube 4
A is fixed by using silver solder 7.

Next, as shown in FIG. 3D, the sleeve body 4 is filled with the adhesive 6, and the adhesive is cured. When the adhesive 6 hardens, the connecting portions of the wires 1a and 2a are fixed in the sleeve body 4. Next, as shown in FIG. 3E, the sleeve lid 5 is attached to the sleeve body 4. After that, put the sleeve body 4 and the sleeve lid 5 on the silver solder 7
To fix. As a result, the connection structure of the MI cables 1 and 2 shown in FIG. 1 is completed. As described above, in the method for connecting the MI cables 1 and 2 according to the first embodiment, the MI cables 1 and 2 can be moved after the strands 1a and 2a are connected and the connection portion can be housed in the sleeve body 4. it can. Then, by filling the adhesive and closing the sleeve lid 5, the connecting portions of the wires 1a and 2a can be completely shielded from the outside air.

As described above, according to the first embodiment, since the connecting portion between the wire 1a and the wire 2a can be housed and sealed in the closed space within the sleeve 3, for example, in severe conditions such as high temperature steam. Even when used under various conditions, steam can be prevented from entering the sleeve 3. As a result, the steam penetrates into the connection parts of the MI cables 1 and 2, and the wires 1
It is possible to prevent the insulation properties of a and 2a from dropping.
Therefore, it is possible to suppress the occurrence of noise in the electric signals transmitted through the wires 1a and 2a and improve the reliability of the connection of the MI cables 1 and 2.

(Second Embodiment) FIG. 4 is a sectional view showing a second embodiment of the present invention. In the second embodiment, the sleeve 3 of the first embodiment is composed of a sleeve body 4, an extension tube 8 and a sleeve lid 5. Extension tube 8
The sleeve body 4 and the sleeve body 4 are fixed by engaging the extension tube 8 and the screw formed on the sleeve body 4 in the same manner as the sleeve body 4 and the sleeve lid 5 in the first embodiment. Then, in the second embodiment, the screw of the sleeve lid 5 is engaged with the screw of the extension tube 8 to fix the extension tube 8 and the sleeve lid 5. The other configurations of the second embodiment are similar to those of the first embodiment, and the sleeve 3 is housed in the closed space formed by the sleeve body 4 and the extension pipe 8 and the connecting portions of the wires 1a and 2a are housed and bonded. The agent 6 is filled.

FIG. 5 is a schematic diagram showing a procedure for connecting MI cables 1 and 2 using the connection structure of the second embodiment. The procedure of the method for connecting the MI cables 1 and 2 using the connection structure according to the second embodiment will be described with reference to FIG. First, as shown in FIG. 5A, the sleeve body 4
Insert the MI cables 1 and 2 into the insertion guide tube 4a.
At this time, the MI cables 1 and 2 are passed through the insertion guide tube 4a until the strands 1a and 2a at the tips of the MI cables 1 and 2 come out from the inside of the sleeve body 4. This allows the wires 1a and 2a to be easily connected to each other outside the sleeve body 4.

Next, as shown in FIG. 5B, the wire 1a
And the tip of the wire 2a are connected by a method such as silver brazing. After that, the MI cables 1 and 2 and the insertion guide tube 4a are fixed by using a silver solder 7. Next, FIG.
As shown in (c), the extension tube 8 is fastened and fixed to the sleeve body 4. As a result, the connecting portion of the wires 1a and 2a is housed in the space formed by the sleeve body 4 and the extension tube 8. Next, as shown in FIG. 5D, the sleeve body 4 and the extension tube 8 are filled with the adhesive 6 and cured. When the adhesive 6 hardens, the connecting portions of the wires 1a and 2a are fixed in the sleeve body 4 and the extension tube 8.

Next, as shown in FIG. 5 (e), the extension pipe 8
Attach the sleeve lid 5 to the. After that, the sleeve body 4 and the extension tube 8 and the extension tube 8 and the sleeve lid 5 are fixed to each other by using a silver solder 7. As a result, M shown in FIG.
The connection structure of the I cables 1 and 2 is completed. Embodiment 2
In the connection method of No. 3, after connecting the wires 1a and 2a by a method such as silver brazing, the connecting portions of the wires 1a and 2a are extended pipes without moving the MI cables 1 and 2 with respect to the sleeve body 4. 8 can be stored inside. Therefore, especially when the wire diameters of the MI cables 1 and 2 are very small, M
The force applied to the I cables 1 and 2 can be suppressed, and MI
The deformation of the cables 1 and 2 is suppressed.

As a result, the connecting portions of the wires 1a and 2a can be arranged near the center of the inner diameters of the sleeve body 4 and the extension tube 8, and the wires 1a and 2a are aligned with the inner diameters of the sleeve body 4 and the extension tube 8. It is possible to prevent contact and short circuit. In each of the above-described embodiments, the silver body 7 was used for sealing after connecting the sleeve body 4, the sleeve lid 5, and the extension pipe 8. However, a gasket was inserted between these members to perform spot welding. Even if fixed by, the sealing can be performed similarly. Moreover, you may seal by methods, such as crimping. Moreover, in each of the above-described embodiments, the sleeve body 4 is provided with the insertion guide tube 4a.
The MI cable 1 or 2 may be supported by the sleeve body 4 by ensuring a predetermined thickness at the bottom of the MI cable 1.

[0041]

According to the wiring connecting sleeve and the wiring connecting structure of the present invention, since the wiring connecting portion can be housed in the closed space, the wiring connecting portion can be used even in a harsh environment such as high temperature steam. Can be protected.

Further, by filling the adhesive, the connecting portion of the wiring can be fixed in the closed space. For this reason,
It is possible to prevent contact between the connection portion and a member forming the closed space, and it is possible to enhance the insulating property of the connection portion.

Further, the closed space can be surely constructed by the bottomed cylinder and the lid. Therefore, it is possible to suppress the insulation drop of the connection portion and achieve highly reliable connection.

Further, by providing the insertion portion at the bottom of the cylinder, the wiring inserted from the insertion portion can be arranged in the cylinder in the longitudinal direction,
It is possible to secure the space for the connection part of the wiring in the enclosed space.

Further, by forming the insertion portion with a pipe, the inserted wiring can be held securely and the wirings can be easily connected.

Further, since another cylinder is inserted between the bottomed cylinder and the lid, the adhesive can be filled without accommodating the wiring connection portion in the bottomed cylinder, especially when the wiring is fine. , The adhesive can be filled without damaging the wiring.

Further, by sealing the gap between the members,
It is possible to enhance the airtightness of the closed space, and it is possible to prevent the reliability of the connection portion of the wiring from being deteriorated even under severe conditions such as high temperature.

According to the wiring connection method of the present invention,
The connection part can be stored in a closed space, and it is possible to prevent the reliability of the connection part of the wiring from decreasing even under severe conditions such as high temperature. In addition, since the adhesive can be reliably filled, the connection portion of the wiring can be fixed in the closed space, and the occurrence of a short circuit with a member forming the closed space can be suppressed.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a connection structure of an MI cable according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing the MI cable connection structure according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing a procedure of an MI cable connecting method according to the first embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a connection structure of an MI cable according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram showing the procedure of the MI cable connection method according to the first embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view showing a conventional MI cable connection structure.

FIG. 7 is a schematic cross-sectional view showing a conventional MI cable connection structure.

[Explanation of symbols]

1, 2 MI cable 1a, 2a strands 3 sleeves 4 Sleeve body 5 sleeve lid 6 adhesive 7 silver wax 8 extension pipes

Claims (10)

[Claims] 1. A wiring connection sleeve for connecting wirings, the sleeve being provided in at least one of the member and at least two members forming the sleeve and forming a sealed space in the sleeve, A wiring connecting sleeve, comprising: an insertion portion into which the wiring to be connected is inserted, and a connection portion of the wiring is housed in the sealed space. 2. The wiring connecting sleeve according to claim 1, wherein an adhesive is filled in the closed space. 3. The member according to claim 1, wherein at least one of the members is a bottomed cylinder, and the other member is a lid that closes the cylinder to form the closed space. Wiring connection sleeve. 4. The wiring connection sleeve according to claim 3, wherein the insertion portion is provided at a bottom portion of the bottomed cylinder. 5. The insertion portion comprises a tube extending from the closed space to the outside thereof.
The sleeve for wiring connection according to any one of to 4. 6. The wiring connection sleeve according to claim 3, wherein another cylinder is inserted between the bottomed cylinder and the lid. 7. The wiring connecting sleeve according to claim 1, wherein a gap between the members is sealed. 8. A structure for connecting wirings, comprising at least two members forming a closed space, and an insertion portion provided in one of the members, inserted into the closed space, A wiring connection structure comprising: wiring connected inside; and an adhesive filled in the sealed space. 9. The wiring connection structure according to claim 8, wherein the wiring is an MI cable. 10. A method for connecting wirings to each other, wherein the wirings to be connected are inserted into a cylinder from an insertion portion at the bottom of the cylinder, the ends of the wires are taken out of the cylinder as they are, and the tips of the wires are outside the cylinder. With connection, return this connection part into the cylinder and store it,
A wiring connection method, characterized in that an adhesive is filled in the cylinder in a state where the in-cylinder connecting portion is housed, and after the adhesive is filled, a lid is attached to the cylinder to seal the inside of the cylinder.