WO2012020472A1 - Device for waterproofing and method of waterproofing - Google Patents

Abstract

Disclosed is a device for waterproofing in which the end of an electric wire which is in contact with a liquid curable resin is pressurized to force the liquid curable resin into the electric wire and the liquid curable resin is cured, thereby waterproofing the electric-wire end, the device being equipped with a pressure vessel for pressurizing the end of the electric wire and an electric-wire-holding part which tightly holds the periphery of the part of the electric wire into which the liquid curable resin is forced.

Description

Water stop treatment apparatus and water stop treatment method

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 apparatus and a water stop treatment method.

As a conventional method for water-stopping an electric wire, for example, one end of the electric wire is decompressed, and a resin is sucked from a terminal at the other end of the electric wire, thereby filling a gap in the electric wire (for example, see Patent Document 1 below) ) Has been proposed. This technique is particularly useful for thin wires that have been widely used in recent years. However, there is a problem in that the resin cannot be sucked because the pressure loss of the reduced pressure occurs when the wire length becomes longer. In addition, there is a problem that the work of attaching the electric wire terminal to the suction device is complicated. Furthermore, the method using reduced pressure has a problem that the selection range of the resin is narrow because only the pressure difference caused by the atmospheric pressure can be used.

On the other hand, as a technique that can solve the problem of the method described in Patent Document 1 below, a method of filling a gap in the wire by pressurizing one end of the wire and press-fitting resin from the pressurized terminal (for example, , See Patent Document 2 below). According to this technology, it is possible to easily and reliably form a water stop structure having a certain length at the end of the electric wire, regardless of the length of the electric wire. Furthermore, since a larger pressure difference can be used in the method using pressurization, a highly viscous curable resin liquid can be filled.

Japanese Unexamined Patent Publication No. 2004-355851 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 from the wire. For this reason, there existed a problem that the water stop process of an electric wire terminal might become inadequate.

The present invention has been made in view of the above circumstances, and prevents the peeling of the coating of the wire when pressurizing one end of the wire and filling the gap in the wire by press-fitting resin from the pressurized end. Thus, an object of the present invention is to provide a water stop treatment device and a water stop treatment method that can reliably perform water stop treatment on an electric wire terminal.

In order to solve the above problems, the present invention employs the following.
That is, the water stop treatment apparatus according to one aspect of the present invention pressurizes an electric wire end in contact with the curable resin liquid, press-fits and cures the curable resin liquid inside the electric wire, and stops the electric wire end. A water-stop treatment apparatus for processing, comprising: a pressure-resistant container that pressurizes the electric wire end; and an electric wire holding portion that holds a portion of the electric wire into which the curable resin liquid is press-fitted from an outer periphery. .
The electric wire holding part may be provided independently of the pressure resistant container.
The pressure-resistant container may have a thick wall portion, and the wall portion may also serve as the electric wire holding portion.
The said electric wire holding part can be divided | segmented into two members, The division | segmentation surface of these two members may be the contact | adherence holding surface of the said electric wire at the time of the joining.
At least one of the divided surfaces of the two members may be covered with a cushioning material.
Moreover, the water stop processing method which concerns on another aspect of this invention is a water stop processing method which performs the water stop process of an electric wire terminal, Comprising: The outer periphery of the part into which the curable resin liquid of the said electric wire is press-fit is closely_contact | adhered. Holding the wire; pressing the wire terminal in contact with the curable resin solution; and press-fitting and hardening the curable resin solution into the wire.

According to the water stop processing device according to one aspect of the present invention, when the wire holding portion is provided, one end of the wire is pressurized and resin is press-fitted from the pressurized terminal to fill the gap in the wire. In addition, it is possible to reliably perform the water stop treatment on the wire terminal.
And since resin is press-fit by pressurization, the water stop structure of a fixed length can be easily and reliably formed in the electric wire terminal regardless of the electric wire length. Further, since the pressure difference can be increased, the curable resin liquid can be filled in a short time, and the curable resin liquid having a high viscosity can be filled.
Moreover, according to the water stop processing method according to another aspect of the present invention, the one end of the electric wire is pressurized by holding the outer periphery of the portion into which the curable resin liquid is press-fitted in the electric wire, Even when resin is press-fitted from the pressurized end to fill the gap in the wire, the wire end can be reliably water-stopped.
And since resin is press-fit by pressurization, the water stop structure of a fixed length can be easily and reliably formed in the electric wire terminal regardless of the electric wire length. Further, since the pressure difference can be increased, the curable resin liquid can be filled in a short time, and the curable resin liquid having a high viscosity can be filled.

It is sectional drawing along the direction perpendicular | vertical to the depth direction of the pressure-resistant container with which this water stop processing apparatus was equipped of the water stop processing apparatus which concerns on one Embodiment of this invention. It is sectional drawing along the depth direction of the said pressure-resistant container of the water stop processing apparatus which concerns on the same embodiment. It is a perspective view of the electric wire holding part comprised in the water stop processing apparatus concerning the embodiment comprised so that division | segmentation was possible. It is sectional drawing along the direction perpendicular | vertical to the depth direction of the said pressure | voltage resistant container of the electric wire holding part provided in the water stop processing apparatus which concerns on other embodiment of this invention. It is a front view of the electric wire holding part provided in the water stop processing device concerning the embodiment. It is sectional drawing in the plane which passes along the central axis of a longitudinal direction of the electric wire holding part provided in the water stop processing apparatus which concerns on other embodiment of this invention. It is sectional drawing along the direction perpendicular | vertical to the depth direction of a pressure-resistant container of the electric wire holding part provided in the water stop processing apparatus which concerns on further another embodiment of this invention. It is a front view of the electric wire holding part provided in the water stop processing device concerning the embodiment. It is a principal part perspective view which shows the case where a liquid osmose | permeates between conductor strands by a capillary phenomenon. It is sectional drawing along the direction perpendicular | vertical to the depth direction of the pressure-resistant container with which this water stop processing apparatus was equipped of the water stop processing apparatus which concerns on other embodiment of this invention. It is sectional drawing along the depth direction of the said pressure-resistant container of the water stop processing apparatus which concerns on the same embodiment.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1A is a cross-sectional view along a direction perpendicular to the depth direction of a pressure-resistant container provided in the water stop treatment apparatus of the water stop treatment apparatus according to an embodiment of the present invention. FIG. 1B is a cross-sectional view along the depth direction of the pressure-resistant container of the water stoppage treatment apparatus according to the embodiment.

In FIG. 1A and FIG. 1B, reference numeral 10 denotes a water-stop treatment device, reference numeral 11 denotes a pressure-resistant container, reference numeral 12 denotes a main body (hereinafter abbreviated as a main body) of the pressure-resistant container, and reference numeral 13 denotes a lid body (hereinafter referred to as a main body) , Abbreviated as a lid), reference numeral 14 denotes a sealing packing, reference numeral 15 denotes a pressurized gas flow path, reference numeral 20 denotes an electric wire, and reference numeral 21 denotes 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. Even for such an electric wire, the present invention exhibits an excellent water stop treatment effect.

The water-stop treatment device 10 is connected to communicate with the pressure-resistant container 11 including the main body 12 and the lid 13, the sealing packing 14 interposed between the main body 12 and the lid 13, and the inside of the pressure-resistant container 11. The pressurized gas flow path 15 is provided. Further, an electric wire holding member 30 for closely holding the electric wire 20 along its longitudinal direction is provided in the pressure resistant container 11 (pressurizing chamber). Here, the close contact holding means that the outer periphery of the electric wire 20 and the electric wire holding member 30 are held in close contact with each other.
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 leaks out of the container. I can prevent it.

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 split into two holding members 30A and 30B on a plane passing through the longitudinal central axis.
The electric wire holding member 30 can be fixed by a fixing mechanism (not shown) such as a clamp or a clip in order to hold the inserted electric wire 20 in close contact along the longitudinal direction and maintain the close contact state.

Moreover, the electric wire storage groove 30a of the electric wire holding member 30 is formed in each joining surface (split surface) 30b of two holding members 30A and 30B along the longitudinal center line 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 to form one through hole that passes through the central axis in the longitudinal direction of the wire holding member 30. It comes to form. The electric wire storage groove 30a stores the electric wire 20 and closely holds at least a part of the press-fitted portion of the curable resin liquid in the electric wire 20 from the outer periphery thereof.
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 close contact holding surface of the electric wire 20 at the time of joining.

Further, 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 held tightly. This shape is preferably a semicircular shape in which a gap is hardly generated between the electric wire 20 and the electric wire receiving groove 30a.

Further, the width of the opening of the electric wire storage groove 30a is appropriately determined according to the outer diameter of the electric wire 20 stored therein. The width is preferably large enough that no gap is generated between the electric wire 20 and the electric wire storage groove 30a when the electric wire 20 is stored. 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.

The length L in the longitudinal direction of the electric wire housing groove 30a can be adjusted as appropriate so as to obtain a length for filling (press-fit) a curable resin liquid capable of obtaining a sufficient water stop effect. The filling length of the curable resin liquid (the length of filling the end portion of the electric wire with the curable resin liquid) depends on the type of the curable resin liquid and the pressurizing condition, but is usually preferably 10 mm to 100 mm, preferably 20 mm. More preferably, it is ˜80 mm.

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. Specifically, various metals, ceramics, rubber, plastic, paper, cotton and the like are used. In particular, a rubber or an elastomer that can improve airtightness and can keep the electric wire in close contact even when deformed following the electric wire is preferable.

Since the electric wire 20 held tightly by the electric wire holding member 30 is prevented from being peeled off from the strand by the pressure when the electric wire 20 is pressed, a gap is formed between the press-fitted resin. I can prevent that. For this reason, the water stop process can be stably performed regardless of the material of the coating or the resin. For example, even when a coating made of polyvinyl chloride, a halogen-free elastomer, or various plastics containing these, which is a material that is 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 30e. Furthermore, it is more preferable that both the electric wire housing grooves 30a and the joint surface 30b are covered with the buffer material 30e. As described above, by joining the holding members 30A and 30B via the cushioning material 30e, it is possible to secure the air tightness while securing higher airtightness.
In this case, the size of the electric wire storage groove 30a can be set large in consideration of the thickness of the buffer material 30e.
The cushioning material 30e is preferably made of the same material as the sealing packing 14. Moreover, the thickness of the buffer material 30e can be suitably adjusted in the range which does not reduce the adhesion degree of the electric wire 20.

In addition, when using the buffer material 30e, the groove | channel corresponding to the electric wire accommodation groove | channel 30a may be formed in the joining surface, and it may be made not to provide the electric wire accommodation groove | channel 30a in the holding member 30A or 30B. (Not shown). Which form is adopted can be appropriately selected according to the outer diameter of the electric wire, the thickness of the buffer material 30e, and the like.

For example, the wire holding member 30 may have one end face 30c in the longitudinal direction 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 these inner wall surfaces. When in contact with the inner wall surface, it may be fixed to the inner wall surface with an adhesive or the like. Moreover, the electric wire holding member 30 may be spaced apart from the resin droplet lower part, for example so that the curable resin liquid dripped at the electric wire terminal part may not adhere to the other end surface 30d in the longitudinal direction.
FIG. 7: A is sectional drawing along the direction perpendicular | vertical to the depth direction of the pressure-resistant container with which this water stop processing apparatus was provided of the water stop processing apparatus which concerns on other embodiment of this invention. FIG. 7B is a cross-sectional view along the depth direction of the pressure-resistant container of the water stop treatment apparatus according to the embodiment.
As shown in FIGS. 7A and 7B, the electric wire holding member 30 disposed in the pressure-resistant container 11 may be formed not only to hold the electric wire 20 but also to surround the terminal portion 21. Further, the outer peripheral surface (periphery) of the electric wire holding member 30 may be in contact with the inner wall surface of the pressure-resistant container 11, that is, the inner wall surface 12 a of the main body 12 and the inner wall surface 13 a of the lid body 13. In this way, the outer peripheral surface of the wire holding member 30 is in close contact with the inner wall surface of the pressure-resistant container 11 so that the pressure-resistant container 11 is sealed, and the sealing packing 14 is not interposed between the main body 12 and the lid body 13. However, the pressure-resistant container 11 can be sealed.

1A and 1B show an example in which the electric wire holding member 30 is provided in the pressure resistant container 11 (pressurizing chamber). However, the electric wire holding member is at least a pressure resistant container on the sealing terminal side of the electric wire 20. You may penetrate in the wall part of a pressure-resistant container so that it may protrude inside. FIG. 3A is a cross-sectional view taken along a direction perpendicular to the depth direction of the pressure-resistant container, at a portion where the wire holding member of the pressure-resistant container is provided. FIG. 3B is a front view of the electric wire holding portion provided in the water stop treatment apparatus according to the embodiment. 3A and 3B, the same components as those of the embodiment shown in FIGS. 1A and 1B 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 FIGS. 3A and 3B includes a main body 12 ′ and a lid body 13 ′. The main body 12 ′ and the lid body 13 ′ are joined to each other via two sealing packings 14 ′. The main body 12 ′ has a recess 12e ′. A recess 13e 'is formed in the lid 13'. A curved portion 14e ′ is formed in the sealing packing 14 ′. 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 e at the electric wire housing groove and the joint surface. For this reason, the electric wire 20 is closely held with high airtightness, and the hermeticity inside the pressure resistant container 11 ′ is secured.

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 can 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 FIGS. 1A and 1B except for the above points.

In FIGS. 1A to 3B, the example in which the wire holding member 30 configured to be split into two holding members 30A and 30B is used as the wire holding member has been described, but the wire holding member may not be split. good.
FIG. 4 is a cross-sectional view of such a wire holding member 30 ′ 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, in order to hold the electric wire 20 in close contact, it is necessary to insert the electric wire 20 into the electric wire receiving groove 30 a ′ before attaching the terminal portion 21. 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 end portion that expands the inner diameter X may be any end portion corresponding to the insertion direction of the electric wire 20 out of both end portions of the electric wire holding member 30 ′.

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 can be adjusted in the same manner as the length L in the longitudinal direction of the 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 can be set in size in consideration of the thickness of the buffer material. The material of the buffer material is the same as the material of the buffer material 30e 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 FIGS. 1A and 1B, and may be provided inside the pressure resistant container (pressure chamber), or the wall portion of the pressure resistant container It may be penetrated by.
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.

1A to 4 show an example in which the electric wire holding member can be provided separately from the pressure resistant container, but in the present invention, the pressure resistant container includes a part of the electric wire holding portion. May also serve as.
FIG. 5A is a schematic view illustrating an electric wire holding part of such a pressure resistant container, and is a cross-sectional view perpendicular to the depth direction of the pressure resistant container. FIG. 5B is a front view of the electric wire holding part provided in the water stop treatment apparatus according to the embodiment.

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 30e ″.
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 ″.

On the joint surface 12f ″ of the main body 12 ″ and the joint surface 13f ″ of the lid body 13 ″, a recess 12e ″ and a recess 13e ″ are formed in the width direction (insertion direction of the electric wire 20), respectively. The two cushioning materials 30e ″ are each provided with a wire housing groove 30a ″ in the width direction (the insertion direction of the 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. "They are combined to form one through hole in the width direction of the cushioning material 30e" (the insertion direction of the electric wire 20). And the electric wire 20 is accommodated in the electric wire accommodation groove 30a ", and at least the electric wire 20 The press-fitting portion of the curable resin liquid can be closely adhered and held from the outer periphery with high airtightness.
Thus, the joining surface 12f ″ and the joining surface 13f ″ in which the wire housing groove 30a ″ of the cushioning material 30e ″ is formed function as an adhesion 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". Then, the electric wire holding part 30 ″ holds the electric wire 20 in close contact with high airtightness and ensures the hermeticity inside the pressure resistant container 11 ″.

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

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

The pressure resistant container 11 ″ is the same as the pressure resistant container 11 shown in FIGS. 1A and 1B 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 to FIG. 1A and FIG. 1B is demonstrated, the water stop process can be similarly performed also in the case of the water stop processing apparatus of another form.
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 to each other at the joining surfaces 30b, and the terminal portion of the electric wire 20 disposed in the pressure-resistant container 11 is used. The portion excluding 21 (the vicinity of the terminal portion 21 of the electric wire 20, that is, the press-fitting portion of the curable resin liquid) is closely held by the electric wire holding member 30 from the outer periphery.

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 electric wire 20 with a strength sufficient to always maintain the close contact state between the wire and the coating. 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, compressed gas is introduce | transduced in the pressure-resistant container 11 from a gas supply source, and the terminal 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.
When the viscosity of the curable resin liquid is less than 0.6 Pa · s, the above-mentioned isotropic pressure makes it easy to fill 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.

As the curable resin liquid, for example, a one-component condensation reaction type silicone rubber, a two-component condensation reaction type silicone rubber, a thermosetting type silicone rubber, an ultraviolet curable type silicone rubber, or the like is used.
The pressure when the wire terminal is isotropically pressurized is preferably 0.1 MPa to 0.5 MPa, and more preferably 0.3 MPa 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

3A and 3B, when using a water-stopping device in which the wire holding member penetrates the wall of the pressure-resistant container, the wire that holds the wire in close contact via the sealing packing 14 ' The water stop treatment can be performed in the same manner as in the case of using the water stop treatment apparatus shown in FIGS. 1A and 1B except that the lid is fixed to the main body and the pressure-resistant container is sealed so as to sandwich the holding member.

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 electric wire holding member 30 ′ is used in the form shown in FIGS. 1A and 1B, first, the electric wire 20 is inserted from the side of the electric wire holding groove 30a ′ of the electric wire holding member 30 ′ where the inner diameter X is enlarged. Then, the electric wire 20 is brought into close contact with 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).
Thereafter, the water stop treatment can be performed in the same manner as in the case of using the water stop treatment apparatus shown in FIGS. 1A and 1B.

When the wire holding member 30 ′ is used in the form shown in FIG. 3A and FIG. 3B, after crimping the terminal portion 21 to the end of the wire 20 in the same procedure as described above, the wire is connected via the sealing packing 14 ′. The pressure-resistant container can be sealed by fixing the lid to the main body so as to sandwich the tightly held wire holding member.

As shown in FIG. 5A and FIG. 5B, a water stop treatment method in the case of using a pressure resistant container 11 ″ provided with a wire holding portion 30 ″ on the wall portion is as follows, for example.
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, the 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 30e" and stored in the other electric wire storage groove 30a ". In this manner, the two cushioning materials 30e ″ are joined together, and the electric wire 20 is sandwiched between the two cushioning materials 30e ″. 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 together at the respective joining surfaces 12f ″ and 13f ″. As a result, 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 closely held by the two cushioning materials 30e ″ from the outer periphery. Next, the end of the electric wire 20 is isotropically pressurized.
Thereafter, the water stop treatment can be performed in the same manner as in the case of using the water stop treatment apparatus shown in FIGS. 1A and 1B.

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, 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, so that it is out of the application range of the 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, when the curable resin liquid is permeated into the end portion of the electric wire, pressurization is more advantageous than decompression.

Also, from the above formulas (3) and (4), the speed at which the resin proceeds is inversely proportional to the viscosity of the resin. That is, 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 in close contact with the wire holding part such as the wire holding member or the wire holding part from the outer periphery. 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" Bonding surface of a pressure-resistant container main body 13f "Bonding surface of a pressure-resistant container cover body 20 Electric wire 30, 30' Electric wire holding member 30" Electric wire holding part 30A, 30B Holding member 30b Joint surface (split surface)
30e, 30e "cushioning material

Claims (6)

1. Pressurizing the electric wire terminal in contact with the curable resin liquid, press-fitting and curing the curable resin liquid inside the electric wire, and a water-stop treatment device for water-stopping the electric wire terminal,
   A pressure-resistant container that pressurizes the wire end;
   An electric wire holding portion for closely holding the portion of the electric wire into which the curable resin liquid is press-fitted from the outer periphery;
   A water stop treatment device comprising:
2. The water stop treatment device according to claim 1, wherein the electric wire holding portion is provided independently of the pressure resistant container.
3. The water-stop treatment device according to claim 1, wherein the pressure-resistant container has a thick wall portion, and the wall portion also serves as the electric wire holding portion.
4. The electric wire holding part can be divided into two members,
   The water stop treatment device according to any one of claims 1 to 3, wherein a divided surface of the two members serves as a close contact holding surface of the electric wire at the time of joining.
5. 5. The water stop treatment apparatus according to claim 4, wherein at least one of the divided surfaces of the two members is covered with a buffer material.
6. A water stopping method for water stopping a wire end,
   A step of closely attaching and holding an outer periphery of a portion of the electric wire into which the curable resin liquid is press-fitted;
   Pressurizing the wire end in contact with the curable resin liquid;
   Pressing and curing the curable resin liquid inside the electric wire;
   The water stop processing method characterized by providing.

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