JP2010192164A - Water cut-off treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device certainly performing water cut-off treatment of the terminal of an electric wire by preventing separation of coating of the electric wire in a method of pressurizing one end of the electric wire and press fitting a resin from the pressurized terminal to fill a gap. <P>SOLUTION: A water cut-off treatment device 10 performs the water cut-off treatment of a terminal of each of electric wires 20 by pressurizing the terminal of each of the electric wires 20 in contact with curing resin liquid, and pressing in the curing resin liquid inside each of the electric wires 20 to be cured. The device includes a pressure-resistant container 11 for pressurizing the terminal of each of the electric wires 20. The pressure-resistant container 11 is provided with electric wire holding members 30 for holding by pressure a press fit portion of the curing resin liquid in each of the electric wires 20 from an outer periphery. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is used for water-stop treatment of wire terminals to prevent short-circuiting and corrosion in electric wires installed and wired in places and parts where liquids such as water and organic solvents may be splashed or touched. The present invention relates to a water stop treatment device.

  As a conventional water stopping method for an electric wire, for example, a method of filling a gap by depressurizing one end and injecting resin from a terminal (see, for example, Patent Document 1) has been proposed. This technique is particularly useful for small-diameter wires that have been widely used in recent years. However, when the length of the electric wire is increased, the pressure loss of the reduced pressure occurs, and there is a problem that the resin cannot be sucked. In addition, there is a problem that the work of attaching the electric wire terminal to the suction device becomes complicated. Furthermore, since the pressure difference can be produced only by the atmospheric pressure under reduced pressure, there is a problem that the range of resins that can be selected is narrowed.

  On the other hand, as a technique capable of solving the problems of the method described in Patent Document 1, a method of filling a gap by pressurizing one end of an electric wire and press-fitting resin from the pressurizing terminal (for example, Patent Document 2) Have been proposed). According to this technology, it is possible to easily and reliably form a fixed length water-stopping structure at the end of the wire regardless of the length of the wire, and to increase the pressure difference, so that it is possible to fill a highly viscous curable resin liquid. It is done.

JP 2004-355851 A International Publication No. 2007/052693 Pamphlet

  However, in the method described in Patent Document 2, the compressed gas supplied at the time of pressurization may enter between the wire of the electric wire and the coating, and the coating may expand and peel off from the wire. There was a problem that the water stop treatment of the water may become insufficient.

  The present invention has been made in view of the above circumstances, and in a method of pressurizing one end of an electric wire and press-fitting resin from the pressurizing terminal to fill a gap, the electric wire terminal is prevented from peeling off. It is an object of the present invention to provide a device that can reliably stop water.

To solve the above problem,
The present invention is an apparatus for pressurizing an electric wire terminal in contact with a curable resin liquid, press-fitting and curing the curable resin liquid inside the electric wire, and water-stopping the electric wire terminal, A pressure-resistant container for pressurizing the electric wire terminal is provided, and the pressure-resistant container is provided with electric wire holding means for pressing and holding the press-fitted portion of the curable resin liquid from the outer periphery of the electric wire. Provided is a water stop treatment device.
In the water stop treatment apparatus of the present invention, it is preferable that the electric wire holding means is provided independently with respect to the pressure resistant container.
Moreover, it is preferable that the thick wall part of the said pressure | voltage resistant container is made into the said electric wire holding means in the water stop processing apparatus of this invention.
Moreover, in the water stop treatment apparatus of the present invention, it is preferable that the electric wire holding means can be divided into two members, and the divided surfaces of these members become the crimp holding surfaces of the electric wires at the time of joining.
Moreover, it is preferable that at least one said division surface is coat | covered with the buffer material in the water stop processing apparatus of this invention.

According to the present invention, by providing the electric wire holding means, the electric wire terminal can be reliably water-stopped even by a method of pressurizing one end of the electric wire and press-fitting resin from the pressurizing terminal to fill the gap.
Since the resin is press-fitted by pressurization, a fixed length water-stopping structure can be easily and reliably formed on the wire end regardless of the wire length, and the pressure difference can be increased. It can be filled with curable resin liquid with high viscosity.

It is the schematic which illustrates the water stop processing apparatus which concerns on this invention, (a) is sectional drawing perpendicular | vertical to the depth direction of the pressure resistant container with which the water stop processing apparatus was equipped, (b) is the depth of a pressure resistant container. It is sectional drawing along a vertical direction. It is a perspective view which illustrates the partial structure of the electric wire holding means comprised in the water stop processing apparatus which concerns on this invention comprised so that division | segmentation was possible. It is the schematic which shows the other example of the electric wire holding means provided in the water stop processing apparatus which concerns on this invention, (a) is sectional drawing perpendicular | vertical to the depth direction of a pressure-resistant container, (b) is a front view. is there. It is the schematic which shows the further another example of the electric wire holding means provided in the water stop processing apparatus which concerns on this invention, and is sectional drawing in the plane which passes along the central axis of a longitudinal direction. It is the schematic which shows the further another example of the electric wire holding means provided in the water stop processing apparatus which concerns on this invention, (a) is sectional drawing perpendicular | vertical to the depth direction of a pressure-resistant container, (b) is a front view. It is. It is a principal part perspective view for demonstrating the case where a liquid osmose | permeates between conductor strands by a capillary phenomenon.

Hereinafter, the present invention will be described in detail with reference to the drawings.
1A and 1B are schematic views illustrating a water stop treatment apparatus according to the present invention, in which FIG. 1A is a cross-sectional view perpendicular to the depth direction of a pressure resistant container provided in the water stop treatment apparatus, and FIG. It is sectional drawing along the depth direction of the property container.

In FIG. 1, reference numeral 10 denotes a water stop treatment device, reference numeral 11 denotes a pressure resistant container, reference numeral 12 denotes a main body of the pressure resistant container (hereinafter abbreviated as a main body), and reference numeral 13 denotes a lid body of the pressure resistant container (hereinafter referred to as the lid body). 14 is a sealing packing, 15 is a pressurized gas flow path, 20 is an electric wire, and 21 is a terminal portion.
The electric wire 20 is not particularly limited as long as a plurality of conductor wires are covered with insulation, or a composite wire thereof is covered with a jacket. An electric wire in which a plurality of conductor strands are insulated and coated has a large volume of gaps between conductor strands or between the conductor strands and the sheath, and the coating or jacket is easily peeled off from the strand during pressurization, Even for such an electric wire, the present invention exhibits an excellent water stop treatment effect.

The water-stop treatment device 10 is connected so as to communicate with the pressure-resistant container 11 including the main body 12 and the lid body 13, the sealing packing 14 interposed between the main body 12 and the lid body 13, and the pressure-resistant container 11. And a pressurized gas flow path 15. Moreover, an electric wire holding member 30 for holding the electric wire 20 in a pressure-bonded manner along the longitudinal direction is provided inside the pressure-resistant container 11 (pressurizing chamber).
The main body 12 has a rectangular shape in plan view, and has a shallow container shape whose cross-sectional shape in the depth direction is substantially U-shaped.

The lid 13 is a member that covers the opening of the main body 12, is integrated with the main body 12, and forms a space (pressurizing chamber) that accommodates the terminal portion of the electric wire therein.
The material constituting the main body 12 and the material constituting the lid body 13 are not particularly limited as long as they can withstand the pressure of the compressed gas introduced into the pressure resistant container 11. Further, the main body 12 and the lid body 13 are all or partly made of a light-transmitting material (for example, glass, plastic, etc.) as long as it can withstand the pressure of the compressed gas introduced into the pressure-resistant container 11. May be.

  The sealing packing 14 is a frame-like member (O-ring) that has the same shape as the opening of the main body 12. When the pressure-resistant container 11 is configured by covering the main body 12 with the lid 13, the pressure-resistant container 11. Improves the internal sealing performance. By interposing this sealing packing 14 between the main body 12 and the lid 13, the compressed gas introduced into the pressure-resistant container 11 through the pressurized gas flow path 15 does not leak out of the container. .

The sealing packing 14 is provided with a plurality of holes 14 a that allow the inside and the outside of the pressure-resistant container 11 to communicate with each other in order to insert the electric wire 20. The diameter (inner diameter) of the hole 14a is such that when the electric wire 20 is inserted, the sealing packing 14 and the electric wire 20 are in close contact with each other, and there is no gap between them.
As the sealing packing 14, a rubber packing made of synthetic rubber such as natural rubber, nitrile rubber, silicone rubber, acrylic rubber, styrene butadiene rubber, fluorine rubber, ethylene propylene rubber or the like is used.

The pressurized gas flow path 15 is connected to the main body 12 via a valve (not shown) such as an electromagnetic valve.
The pressurized gas channel 15 is connected to a high pressure gas supplied from a gas supply source (not shown) such as various gas cylinders and factory compressed air piping via a regulator (not shown) for adjusting the pressure to a predetermined pressure. It is connected to the gas supply source.
The pressure-resistant container 11 has a fixing mechanism (not shown) such as a clamp for fixing the lid 13 to the main body 12 and maintaining a sealed state even when compressed gas is introduced into the pressure-resistant container 11. Is provided.

Inside the pressure resistant container 11, an electric wire holding member 30 in which an electric wire housing groove 30 a communicating with the hole 14 a of the sealing packing 14 is formed is disposed.
The electric wire holding member 30 has a columnar shape such as a prism or a cylinder, and is configured to be vertically divided into two holding members 30A and 30B on a plane passing through the central axis in the longitudinal direction.
The electric wire holding member 30 is for holding the inserted electric wire 20 by crimping along its longitudinal direction, and can be fixed by a fixing mechanism (not shown) such as a clamp or a clip in order to maintain the crimped state. .

Moreover, the electric wire accommodation groove | channel 30a of the electric wire holding member 30 is formed in the joining surface (division surface) 30b of two holding members 30A and 30B along the centerline of the longitudinal direction of this joining surface 30b. When the two holding members 30 </ b> A and 30 </ b> B are joined at the respective joining surfaces 30 b, the respective wire storage grooves 30 a are aligned with each other, and one through hole that passes through the longitudinal central axis of the wire holding member 30. Is supposed to form. The electric wire storage groove 30a stores the electric wire 20 and holds at least the press-fitted portion of the curable resin liquid from the outer periphery of the electric wire 20 by pressure bonding.
Thus, the joint surface (divided surface) 30b in which the wire housing grooves 30a of the holding members 30A and 30B are formed functions as a pressure-bonding holding surface of the wire 20 at the time of joining.

  Moreover, the shape of the cross section perpendicular to the longitudinal direction of the electric wire storage groove 30a is not particularly limited as long as the electric wire 20 can be stored in the electric wire storage groove 30a and can be crimped and held, but there is the largest gap between the electric wire 20 and the electric wire storage groove 30a. A semicircular shape is preferable because it is difficult to occur.

  Moreover, although the width | variety of the opening part of the electric wire accommodation groove | channel 30a is determined suitably according to the outer diameter of the electric wire 20 accommodated there, when the electric wire 20 is accommodated, between the electric wire 20 and the electric wire accommodation groove | channel 30a. A size that does not cause a gap is preferable. Specifically, it is preferable that the inner diameter of the through hole formed by combining the electric wire housing grooves 30 a is equal to or slightly smaller than the outer diameter of the electric wire 20. And it is preferable that the width | variety of the opening part of the electric wire accommodation groove | channel 30a is a magnitude | size which does not produce a clearance gap between the electric wire 20 and the electric wire accommodation groove | channel 30a along the whole area of a longitudinal direction.

  What is necessary is just to adjust suitably the length L of the longitudinal direction of the electric wire accommodation groove | channel 30a so that the filling (press-fit) length of the curable resin liquid from which sufficient water stop effect is acquired can be obtained. The filling length of the curable resin liquid is usually preferably 30 to 100 mm, more preferably 50 to 80 mm, although it depends on the type of curable resin liquid and the pressurizing conditions.

  The material constituting the electric wire holding member 30 is not particularly limited as long as it does not deform or break due to the pressure when a compressed gas having a predetermined pressure is introduced into the pressure resistant container 11. Examples of these include various metals, ceramics, rubber, plastic, paper, and cotton. Of these, rubber and elastomer are preferred because the airtightness can be enhanced and the electric wire can be held by crimping even if it deforms following the electric wire.

  The wire 20 held by crimping with the wire holding member 30 is prevented from being peeled off from the strand by the pressure when the wire 20 is pressed, and a gap may be formed between the pressed resin. In addition, the water stop treatment can be performed stably regardless of the material of the coating or resin. For example, even a coating made of polyvinyl chloride, halogen-free elastomer, or various plastics containing these, which can be easily peeled off from the strands, can be surely water-stopped.

As shown in FIG. 2, it is preferable that at least one of the holding members 30A and 30B of the holding members 30A and 30B is covered with a cushioning material 30d. More preferably, it is covered with a buffer material 30d. Thus, the electric wires 20 can be pressure-bonded and held with higher airtightness by joining the holding members 30A and 30B via the cushioning material 30d.
In this case, the size of the electric wire storage groove 30a may be set larger in consideration of the thickness of the buffer material 30d.
The cushioning material 30d is preferably made of the same material as the sealing packing 14. Further, the thickness of the buffer material 30d may be adjusted as appropriate within a range in which the degree of crimping of the electric wire 20 is not reduced.

  When the cushioning material 30d is used, a groove corresponding to the wire housing groove 30a may be formed on the joint surface so that the holding member 30A or 30B does not have the wire housing groove 30a ( (Not shown). Which form is adopted may be appropriately selected according to the outer diameter of the electric wire, the thickness of the buffer material 30, and the like.

  The electric wire holding member 30 may be in a state in which, for example, the end face 30c in the longitudinal direction is in contact with the inner wall surface of the pressure-resistant container 11, that is, the inner wall surface 12a of the main body 12 and the inner wall surface 13a of the lid body 13 You may arrange | position away from a wall surface. When in contact with the inner wall surface, it may be fixed to the inner wall surface with an adhesive or the like.

  FIG. 1 shows an example in which the electric wire holding member 30 is provided in the pressure-resistant container 11 (pressurization chamber). However, in the electric wire holding member, at least the sealing terminal side of the electric wire 20 protrudes into the pressure-resistant container. As such, it may be provided through the wall of the pressure-resistant container. FIG. 3 is a schematic view illustrating a portion of such a pressure resistant container provided with an electric wire holding member, where (a) is a cross-sectional view perpendicular to the depth direction of the pressure resistant container, and (b) is a front view. It is. In FIG. 3, the same components as those of the embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. The same applies to the subsequent drawings.

The pressure-resistant container 11 ′ shown in FIG. 3 includes a main body 12 ′ and a lid body 13 ′. The main body 12 ′ and the lid body 13 ′ are joined via two sealing packings 14 ′. The body 12 'has a recess 12e', the lid 13 'has a recess 13e', and the sealing packing 14 'has a curved portion 14e'. Then, when the main body 12 ′ and the lid body 13 ′ are joined, the curved portions 14e ′ are aligned along the concave portions 12e ′ and 13e ′. Furthermore, the electric wire holding member 30 is disposed in close contact between the two curved portions 14e ′.
Further, as shown in FIG. 2, the electric wire holding member 30 is covered with the buffer material 30 d at the electric wire housing groove and the joint surface, and at the same time the electric wire 20 is pressure-bonded and held with high airtightness. The inside of 'is sealed.

  When penetrating the wire holding member 30 in the wall portion of the pressure-resistant container, the concave portion 12e ′ and the concave portion 13e ′ are not formed, but the thickness of the sealing packing is increased, and the curved portion 14e ′ is formed thereon. (Not shown). Which form is adopted may be appropriately selected according to the outer diameter of the electric wire, the thickness of the sealing packing, and the like.

  The pressure resistant container 11 ′ is the same as the pressure resistant container 11 shown in FIG. 1 except for the above points.

1-3 demonstrated the example which used the electric wire holding member 30 comprised so that division | segmentation into the two holding members 30A and 30B was possible as an electric wire holding member, but an electric wire holding member may not be separable. .
FIG. 4 is a schematic view illustrating such an electric wire holding member 30 ′, and is a cross-sectional view in a plane passing through the central axis in the longitudinal direction.

  The electric wire holding member 30 ′ shown here has a columnar shape as in the case of the electric wire holding member 30, but is integrally formed, and is used for inserting the electric wire 20 along the longitudinal center line. An electric wire storage groove 30a 'is formed. Since the electric wire holding member 30 ′ cannot be divided, the electric wire 20 needs to be inserted into the electric wire receiving groove 30 a ′ before the terminal portion 21 is mounted in order to hold the electric wire 20 by pressure bonding. Therefore, in order to facilitate the insertion of the electric wire 20, the electric wire holding member 30 ′ has the inner diameter X of the electric wire housing groove 30 a ′ enlarged toward the end in the vicinity of one end in the longitudinal direction. It is preferable that the shape is tapered. By doing in this way, the terminal 20a of the electric wire 20 is guided by the wall surface of the electric wire accommodation groove | channel 30a ', and the insertion of the electric wire 20 becomes easy. The inner diameter X may be enlarged in any vicinity of both ends of the electric wire holding member 30 ′ depending on the insertion direction of the electric wire 20.

  In the electric wire housing groove 30a ′, the length Y in the longitudinal direction other than the portion where the inner diameter X is enlarged needs to be set so as to obtain a filling length of the curable resin liquid that provides a sufficient water stop effect. . Specifically, it may be adjusted in the same manner as the length L in the longitudinal direction of the electric wire housing groove 30a.

  The surface of the electric wire storage groove 30a 'may be covered with a cushioning material (not shown). In this case, the inner diameter X may be set larger in consideration of the thickness of the buffer material. The material of the buffer material may be the same as the material of the buffer material 30d in FIG.

The electric wire holding member 30 ′ can be used, for example, in the same manner as the electric wire holding member 30 shown in FIG. 1, and may be provided in the inside of the pressure resistant container (pressurizing chamber), or provided through the wall of the pressure resistant container. May be.
When the electric wire holding member 30 ′ is provided through the wall of the pressure resistant container, the surface of the electric wire housing groove 30a ′ is covered with the buffer as described above in order to maintain the airtightness in the pressure resistant container. There is a need.

1-4, although the example which can provide an electric wire holding member separately from a pressure | voltage resistant container independently was shown, in this invention, a part of electric pressure holding | maintenance part is an electric wire holding | maintenance part. It may be combined.
FIG. 5 is a schematic view illustrating an electric wire holding part of such a pressure resistant container, where (a) is a cross-sectional view perpendicular to the depth direction of the pressure resistant container, and (b) is a front view.

The pressure-resistant container 11 ″ shown here includes a main body 12 ″ and a lid body 13 ″. The main body 12 ″ and the lid body 13 ″ are joined via two cushioning materials 30d ″. .
In the pressure resistant container 11 ″, the wall portion through which the electric wire 20 is inserted is thick, and the joint portion of the main body 12 ″ and the lid body 13 ″ is the electric wire holding portion 30 ″.

The joint surface 12f ″ of the main body 12 ″ and the joint surface 13f ″ of the lid body 13 ″ are respectively provided with a recess 12e ″ and a recess 13e ″ in the width direction (the insertion direction of the electric wire 20). In the buffer material 30d ″, an electric wire housing groove 30a ″ is formed in the width direction (the insertion direction of the electric wire 20). Then, when the main body 12 ″ and the lid body 13 ″ are joined, the electric wire storage grooves 30a ″ are arranged along the recesses 12e ″ and 13e ″. Further, the electric wire storage grooves 30a are aligned. "The two are combined to form one through hole in the width direction of the cushioning material 30d" (the insertion direction of the electric wire 20). Then, the electric wire 20 is accommodated in the electric wire accommodation groove 30a ", At least the press-fitted portion of the curable resin liquid in the electric wire 20 can be pressed and held from the outer periphery with high airtightness.
As described above, the joining surface 12f ″ and the joining surface 13f ″ in which the wire housing groove 30a ″ of the cushioning material 30d ″ is formed function as a crimp holding surface of the wire 20 at the time of joining. The recesses 12e "and 13e" and the two wire housing grooves 30a "constitute the wire holding part 30". The electric wire holding part 30 ″ holds the electric wire 20 in a highly airtight manner, and at the same time, the hermeticity inside the pressure resistant container 11 ″ is secured.

  The length Z of the wire housing groove 30a ″ may be set so as to obtain a filling length of a curable resin liquid that can provide a sufficient water-stopping effect, and is similar to the length L in the longitudinal direction of the wire housing groove 30a. Adjust it.

  As described above, when the electric wire holding portion is provided on the wall portion of the pressure-resistant container, the recesses 12e "and 13e" are not formed, the thickness of the cushioning material 30d "is increased, and the electric wire receiving groove 30a is formed in this. "May be formed (not shown). Which form is adopted may be appropriately selected according to the outer diameter of the electric wire, the thickness of the buffer material, or the like.

  The pressure-resistant container 11 ″ is the same as the pressure-resistant container 11 shown in FIG. 1 except for the above points.

Next, the water stop processing method of the electric wire terminal which uses the water stop processing apparatus of this invention is demonstrated. Here, although the example using the water stop processing apparatus 10 shown in FIG. 1 is demonstrated, also in the case of the water stop processing apparatus of another form, a water stop process can be performed similarly.
First, the electric wire 20 in which the terminal portion 21 is crimped to the terminal portion from which the coating has been removed is prepared.
Next, a plurality of electric wires 20 are arranged side by side in the main body 12 so that the terminal portion 21 enters the pressure-resistant container 11, and the terminal portion 21 is inserted into the hole 14 a of the sealing packing 14 arranged in the opening of the main body 12. The electric wire 20 is inserted from the terminal on the side opposite to the provided terminal portion.

  Accordingly, the portion excluding the terminal portion 21 of the electric wire 20 arranged in the pressure resistant container 11 (in the vicinity of the terminal portion 21 of the electric wire 20) is stored in the electric wire storing groove 30a of the holding member 30A. Thereafter, the electric wire 20 is accommodated in the electric wire accommodation groove 30a of the holding member 30B, and the two holding members 30A and 30B are joined at the respective joining surfaces 30b, and the terminal portion of the electric wire 20 disposed in the pressure resistant container 11 is provided. The portion excluding 21 (the vicinity of the terminal portion 21 of the electric wire 20, that is, the press-fitted portion of the curable resin liquid) is crimped and held by the electric wire holding member 30 from the outer periphery thereof.

  Note that holding the portion of the electric wire 20 excluding the terminal portion 21 with the electric wire holding member 30 from the outer periphery means holding the wire 20 and the covering of the electric wire 20 with a strength that is always maintained. To tell.

Next, an appropriate amount of a curable resin liquid having fluidity (viscosity) suitable for the wire end portion is dropped onto the portion (terminal) of the terminal portion 21 that is crimped to the wire 20.
Next, the lid 13 is fixed to the main body 12 via the sealing packing 14 by the fixing mechanism, and the pressure-resistant container 11 is sealed. Then, the valve provided in the pressurized gas flow path 15 is opened, and the pressure is supplied from the gas supply source. Compressed gas is introduced into the conductive container 11, and the end of the electric wire 20 is isotropically pressurized. The pressurization is not necessarily isotropic pressurization.

At this time, the pressure of the compressed gas from the gas supply source is adjusted to a predetermined pressure by the regulator, and the compressed gas having the predetermined pressure is supplied into the pressure resistant container 11.
Next, after the curable resin liquid is filled (press-fit) into the end of the electric wire by a predetermined length by this isotropic pressurization, the curable resin liquid is cured to obtain an electric wire whose end is water-stopped with the filled resin. .
In addition, the hardening method of curable resin liquid is suitably selected according to the kind of curable resin liquid to be used.

  Depending on the type of the curable resin liquid, the terminal portion 21 of the electric wire 20 in which the end portion of the electric wire is filled with the curable resin liquid is taken out from the pressure resistant container 11 and then the curable resin liquid is cured, or The curable resin liquid is cured while the terminal portion 21 is disposed in the pressure-resistant container 11.

The viscosity of the curable resin liquid is preferably in the range of 0.6 Pa · s to 60 Pa · s (= 600 mPa · s to 60000 mPa · s), and more preferably 600 mPa · s to 1000 mPa · s.
If the viscosity of the curable resin liquid is less than 0.6 Pa · s, the above-mentioned isotropic pressurization facilitates filling of the end of the electric wire with the curable resin liquid, but the fluidity is too high and the end of the electric wire is It may flow out to the outside without staying, and a desired water stop structure may not be formed at the wire end. On the other hand, when the viscosity of the curable resin liquid exceeds 60 Pa · s, the isotropic pressurization does not sufficiently fill the end of the wire with the curable resin liquid, so that the desired end of the wire terminal is stopped. A water structure may not be formed.

Examples of the curable resin liquid include one-component condensation reaction type silicone rubber, two-component condensation reaction type silicone rubber, thermosetting type silicone rubber, and ultraviolet curable type silicone rubber.
The pressure when the wire terminal is isotropically pressurized is preferably 0.1 to 0.5 MPa, and more preferably 0.3 to 0.5 MPa.
If the pressure when the wire terminal is isotropically pressurized is less than 0.1 MPa, the end of the wire cannot be sufficiently filled with the curable resin liquid, and a desired water stop structure may not be formed on the wire terminal. . On the other hand, even when the pressure at the end of the wire isotropically exceeds 0.5 MPa, the filling property (filling length) of the curable resin liquid to the end of the wire is improved compared to the case of a pressure lower than that. do not do.

  In addition, when compressed gas is introduced into the pressure resistant container 11 from the gas supply source and the end of the electric wire 20 is isotropically pressurized, the pressure container is compressed by the compressed gas introduced into the pressure resistant container 11 from the gas supply source. The pressurization is performed so that the pressure in 11 is uniform. By making the pressure in the pressure-resistant container 11 uniform, the terminal of the electric wire 20 is uniformly pressurized from all directions (isotropic pressure), and the curable resin liquid dropped on the terminal portion 21 of the electric wire 20 is Fills the end of the wire.

The time during which the wire terminal is isotropically pressurized (pressurization time) is appropriately adjusted according to the viscosity of the curable resin liquid, the pressure when the wire terminal is isotropically pressurized, and the like.
Furthermore, the compressed gas introduced into the pressure-resistant container 11 is preferably adjusted as appropriate according to the type of the curable resin liquid, that is, the curing conditions.

For example, when a one-component condensation reaction type silicone rubber is used as the curable resin liquid, the compressed gas may be an inert gas such as nitrogen (N ₂ ) or argon (Ar), air, preferably a humidified gas. It is preferable that the pressure-resistant container 11 has an atmosphere suitable for curing the one-component condensation reaction type silicone rubber.
Further, when a two-component condensation reaction type silicone rubber is used as the curable resin liquid, an inert gas such as nitrogen (N ₂ ) or argon (Ar), air, or the like is used as the compressed gas. The inside is preferably an atmosphere suitable for curing the two-component condensation type silicone rubber.

Further, when thermosetting silicone rubber is used as the curable resin liquid, the inside of the pressure-resistant container 11 is used as a compressed gas by using an inert gas such as nitrogen (N ₂ ) or argon (Ar), air, or the like. It is preferable that the atmosphere is suitable for curing the thermosetting silicone rubber.
In this way, the curable resin liquid can be cured in a short time.
Also, by adjusting the viscosity of the curable resin liquid, the pressure when isotropically pressurizing the wire end, and the time during which the wire end is isotropically pressurized, the length of filling the end portion of the curable resin liquid ( Filling length), that is, the length of the water stop structure can be adjusted.

More specifically, when the length of the water stop structure is increased, (A) the pressure when the wire terminal is isotropically pressurized is increased, (B) the pressurization time is increased, and (C) curing with low viscosity. It is preferable to select one or two or more methods from the three methods of using a conductive resin solution.
On the other hand, when shortening the length of the water stop structure, (a) reducing the pressure when the wire terminal is isotropically pressurized, (b) shortening the pressing time, and (c) a curable resin liquid having a high viscosity. Preferably, one or more methods are selected from the three methods of using

  As shown in FIG. 3, when using a water stop treatment device in which the electric wire holding member is provided through the wall portion of the pressure-resistant container, the electric wire holding member that holds the electric wire by crimping via the sealing packing 14 ′ is used. Except for fixing the lid to the main body and sealing the pressure-resistant container so as to sandwich, the water stop treatment may be performed in the same manner as in the case of using the water stop treatment apparatus shown in FIG.

The water stop processing method in the case of using the electric wire holding member 30 ′ that is not separable as shown in FIG. 4 is as follows, for example.
When the wire holding member 30 ′ is used in the form shown in FIG. 1, first, the wire 20 is inserted from the side where the inner diameter X of the wire holding groove 30a ′ of the wire holding member 30 ′ is enlarged. Assume that 20 is crimped by the electric wire holding member 30 ′. Next, the coating is removed at the end of the electric wire 20 protruding from the electric wire holding member 30 ′, and the terminal portion 21 is crimped.
Next, a plurality of electric wires 20 are arranged side by side in the main body 12 so that the terminal portion 21 enters the pressure-resistant container 11, and the terminal portion in which the terminal portion 21 is provided in the hole 14a of the sealing packing 14 The electric wire 20 is inserted from the terminal on the opposite side.
Next, an appropriate amount of a curable resin liquid is dropped onto the wire terminal portion of the terminal portion 21 that is crimped to the wire 20 (terminal).
Hereinafter, the water stop treatment may be performed similarly to the case of using the water stop treatment apparatus shown in FIG.

  When using the wire holding member 30 ′ in the form shown in FIG. 3, after crimping the terminal portion 21 to the end of the wire 20 in the same procedure as described above, the wire is crimped and held via the sealing packing 14 ′. What is necessary is just to fix a pressure | voltage resistant container by fixing a cover body to a main body so that an electric wire holding member may be pinched | interposed.

As shown in FIG. 5, for example, a water stop treatment method in the case of using a pressure resistant container 11 ″ having a wall holding portion 30 ″ provided on a wall is as follows.
First, the electric wire 20 in which the terminal portion 21 is crimped to the terminal portion from which the coating has been removed is prepared, and the plurality of electric wires 20 are arranged in the main body 12 so that the terminal portion 21 enters the pressure-resistant container 11.
Next, an appropriate amount of a curable resin liquid having fluidity (viscosity) suitable for the wire end portion is dropped onto the portion (terminal) of the terminal portion 21 that is crimped to the wire 20. Then, a portion excluding the terminal portion 21 of the electric wire 20 (in the vicinity of the terminal portion 21 of the electric wire 20) is stored in the electric wire storage groove 30a "of one cushioning material 30d" and stored in the other electric wire storage groove 30a ". In this manner, the two cushioning materials 30d ″ are joined together, and the electric wire 20 is sandwiched between the two cushioning materials 30d ″. Then, the wire storage groove 30a ″ is disposed along the recesses 12e ″ and 13e ″. The main body 12 ″ and the lid body 13 ″ are joined to each other at the joining surfaces 12f ″ and 13f ″, and the portion excluding the terminal portion 21 of the electric wire 20 disposed in the pressure resistant container 11 ″ (the electric wire 20 The vicinity of the terminal portion 21) is pressed and held from the outer periphery with two cushioning materials 30d ″. Next, the end of the electric wire 20 is isotropically pressurized.
Hereinafter, the water stop treatment may be performed similarly to the case of using the water stop treatment apparatus shown in FIG.

In the water stop treatment method, in the state where the curable resin liquid is in contact with the wire end, the wire end is isotropically pressurized to press-fit the curable resin liquid into the inside of the wire, and is cured to be stopped at the wire end. Form a water structure.
Infiltration of the curable resin liquid between the conductor wires of the electric wire or the gap between the coating and the wire can be achieved by utilizing the capillary phenomenon as long as time is required. For example, the penetration length when a resin liquid is infiltrated between the conductor wires having dimensions as shown in FIG. 6 by capillary action is expressed by the following formula (1) from the balance between surface tension and gravity.
h = (l · T · cos θ) / (s · ρ · g) (1)
In formula (1), h is the penetration height of the resin liquid by capillary action, l is the peripheral length of the resin liquid in contact with the strand, T is the surface tension of the resin fluid in contact with the strand, and θ is the strand And s are the area between the strands, ρ is the density of the resin, and g is the gravity.

In the above equation (1), when s and l are removed using the wire outer diameter r, the following equation (2) is obtained.
h = 4πT cos θ / {(2√3-π) ρgr} (2)
For example, T (= 0.021 N / m), θ (= 0.262 rad) and ρ (= 980 kg / m ³ ) of dimethyl silicone as the curable resin liquid, and the outer diameter r (= 0.798 mm) of the strand Is substituted into the equation (2), h = about 26 cm. If it is 26 cm from the end of the electric wire, it is sufficient as a water stop structure at the end of the electric wire.

The reason why pressure reduction or pressurization is necessary is to shorten the process time when forming the water stop structure at the end of the electric wire, that is, to increase the penetration rate of the curable resin liquid. In the case of h = 26 cm, the time for infiltration is not considered.
In a viscous liquid such as a curable resin liquid, the speed of traveling through the pipe depends on the pressure difference between the inside and the outside of the space (pressure-resistant container) in which the curable resin liquid is pressed into the wire terminal. That is, the larger the pressure difference is, the more the viscous liquid can penetrate into the pipeline.

This idea can be easily derived from a capillary viscometer assuming a Newtonian fluid. Viscosity measurement with a capillary viscometer is determined by the following equation (3).
η = π · R ⁴ · ΔP / (8L · Q) (3)
In equation (3), η is the apparent viscosity (appears as a measured value), R is the radius of the capillary, ΔP is the space between the inside (pressure-resistant container) in which the curable resin liquid is pressed into the wire terminal (pressure-resistant container) and the outside. The pressure difference, L is the capillary length (the length of the pipe through which the resin has progressed within a certain period of time), and Q is the flux (volume of the resin passing through the unit time = the speed at which the resin advances).

When the equation (3) is transformed, the following equation (4) is obtained, and the speed is proportional to the pressure difference ΔP in the Newtonian fluid.
Q = (π · R ⁴ ) / (8L · η) · ΔP (4)
Actually, since the curable resin liquid is a non-Newtonian fluid, and the shape between the conductor strands of the electric wire is not a cylindrical capillary, it deviates from the above equation (4). However, even in that case, there is a positive correlation between the speed at which the resin travels and the pressure difference between the inside and outside of the space (pressure-resistant container) in which the curable resin liquid is pressed into the wire terminal. Easy to estimate.

  In the case of depressurization, the pressure difference is only atmospheric pressure (approximately 0.1 MPa), whereas in the case of pressurization, the pressure difference can be set higher (0.1 MPa or more). Therefore, it is understood that pressurization is more advantageous than decompression when the curable resin liquid is permeated into the end portion of the electric wire.

  Moreover, from the said Formula (3) and (4), the speed which resin advances is in inverse proportion to the viscosity of resin. That is, it can be seen that the lower the viscosity of the resin liquid, the higher the flow rate with the same pressure difference. In other words, if a low-viscosity resin liquid can be used, the reduced pressure method is sufficient. However, in other words, if there is no curable resin liquid having a low viscosity and suitable for use as a water-stopping agent, the water-stopping treatment cannot be performed by the reduced pressure method. Thus, it can be said that the pressurization method is more advantageous from the viewpoint of increasing the degree of freedom in selecting the water-stopping agent.

According to the present invention, the compressed gas supplied into the pressure-resistant container can be obtained by holding the wire terminal disposed in the pressure-resistant container by crimping from the outer periphery with the wire holding means such as the wire holding member or the wire holding portion. It is possible to effectively prevent the coating from expanding between the wires of the electric wire and the coating and separating from the wires. As a result, it is possible to reliably stop the electric wire terminal.
Moreover, the water stop structure of fixed length can be easily formed in an electric wire terminal irrespective of electric wire length.
Moreover, by pressurizing the electric wire terminal, the curable resin liquid can be filled in a short time, and a highly viscous curable resin liquid can also be filled.
Moreover, when pressurizing an electric wire terminal, since atmosphere can be adjusted to the conditions on which curable resin liquid is easy to harden | cure, curable resin liquid can be hardened in a short time.

  DESCRIPTION OF SYMBOLS 10 ... Water stop processing apparatus, 11, 11 ', 11 "... Pressure-resistant container, 12f" ... Joining surface of a pressure-resistant container main body, 13f "... Joining surface of a pressure-resistant container lid body, 20 ... Electric wire, 30, 30 '... Electric wire holding member, 30 "... Electric wire holding part, 30A, 30B ... Holding member, 30b ... Joining surface (split surface), 30d, 30d" ... Cushioning materials

Claims (5)

A device for pressurizing an electric wire terminal in contact with a curable resin liquid, press-fitting and curing the curable resin liquid inside the electric wire, and water-stopping the electric wire terminal,
A pressure-resistant container for pressurizing the wire end;
The pressure-resistant container is provided with an electric wire holding means for pressing and holding the press-fitted portion of the curable resin liquid from the outer periphery of the electric wire.   The water stop treatment apparatus according to claim 1, wherein the electric wire holding means is provided independently with respect to the pressure resistant container.   The water stop treatment apparatus according to claim 1, wherein a thick wall portion of the pressure-resistant container is used as the electric wire holding means.   The said electric wire holding means can be divided | segmented into two members, The division surface of these members becomes a crimping | compression-bonding holding surface of the said electric wire at the time of the joining, The Claim 1 characterized by the above-mentioned. Water stop treatment equipment.   The water stop treatment device according to claim 4, wherein at least one of the divided surfaces is covered with a cushioning material.

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