JP5441253B2 - Electric wire water stopping method and water stopping device - Google Patents

Description

  The present invention relates to a water stopping method and a water stopping device for an electric wire in which a water stopping material penetrates between a plurality of core wires wrapped in an insulating coating.

  In order to infiltrate the water-stopping material between the plurality of core wires in the insulation coating, for example, there is a water-stopping method as disclosed in Patent Document 1. In this water stopping method, a step of attaching a grounding terminal to one end of the grounding electric wire, and a gap between the internal wire and the covering material of the in-vehicle electric wires are covered from the outside by a water stopping material having fluidity. The water-stopping material setting step, and the air around the water-stopping material covering the gap is made to have a pressure higher than the pressure inside the covering material so that the water-stopping material penetrates inside the covering material. And a pressing step.

  Among these, in the grounding terminal mounting step, as shown in FIG. 9, in order to crimp the grounding terminal 20 to the processing terminal 16, first, the barrels 22 and 24 of the grounding terminal 20 are opened. Then, the terminal on the side where the covering material 14 of the ground wire 10 is removed, that is, the processing-side terminal 16 is set between the barrels 22 and 24. After the setting, a process of deforming the conductor barrel 22 and the insulation barrel 24 in the closing direction is performed, so that the barrels 22 and 24 are fixed to the inner conductor 12 and the covering material 14 by pressure.

  In the water stop material setting step, a water stop material 18 as shown in FIG. 10 is set on the processing side terminal 16 of the ground wire 10 to which the ground terminal 20 is attached. The water blocking material 18 is dropped at a location between the conductor panel 22 of the grounding terminal 20 and the insulation barrel 24 using a dispenser (not shown), and is stored in the location. Thereby, the said water stop material 18 plugs up the clearance gap between the internal conductor 12 and the coating | covering material 14 in the said process side terminal 16 from the outer side.

  In the pressurizing step, the terminal on the side where the grounding terminal 20 is mounted (that is, the processing-side terminal 16 on which the water blocking material 18 is set) of both terminals of the grounding wire 10 is shown in FIG. In a pressurized container 30, the container is sealed, and compressed air is supplied from the compressor 42 through the pipe 40 into the pressurized container 30. Then, the water stop material 18 is dropped, and the air pressure around the water stop material covering the gap between the internal conductor 12 and the cover material 14 is set to a pressure higher than the pressure inside the cover material 14. The water material 18 can be infiltrated into the coating material 14.

International Publication No. 07/052693 Pamphlet

  However, in the conventional water-stopping method, the compressed air supplied into the pressurized container 30 in the pressurizing step passes through the gap between the inner conductor 12 and the covering material from one end of the grounding wire together with the water-stopping material 18. Then, it discharges with compressed air from the other end (open end) of the earthing | grounding electric wire 10 which faces the atmosphere side. Therefore, it is necessary to receive the discharged water stop material at the open end of the grounding wire, and it is necessary to reuse or discard the received water stop material.

  In addition, when a part of the compressed air enters the water-stopping material 18 in the pressurized container, bubbles are generated in the water-stopping material 18 and voids are generated between the core wires of the internal conductors. There were inconveniences such as a drop in water performance.

  The present invention has been made in view of the above-described circumstances, and its purpose is to return the core wire and the insulation by returning the inside of the insulation coating of the electric wire having the core wire to a vacuum or a reduced pressure environment close to vacuum and then returning to the atmospheric pressure. A water stop for electric wires that allows a curable water stop material to penetrate between the sheath and each core wire without waste, thereby effectively using the water stop material and preventing air bubbles from entering the water stop material. It is to provide a method and a water stop device.

In order to achieve the above-described object, the water stopping method and the water stopping device for an electric wire according to the present invention are characterized by the following (1) to (5).
(1) A water stopping method for an electric wire in which a water stopping material is infiltrated into an insulating coating enclosing a plurality of core wires,
Among the electric wires in which the core wire is exposed at one end of the insulating coating and the other end of the insulating coating is sealed, at least the insulating coating on one end side where the core wire is exposed is stored in an airtight box in a sealed state. Wire storage step to perform,
An air suction step for sucking air in the airtight box from an air suction port provided in the airtight box;
A water-stopping material dropping step for dropping a water-stopping material on the core wire exposed at one end of the insulating coating from the water-stopping material dropping port provided in the airtight box after the suction of air;
An air introduction step for introducing air into the airtight box from the air introduction port provided in the airtight box after completion of dropping of the water blocking material;
Have
When the air is introduced into the airtight box from the air inlet, the water-stopping material dropped on the core wire is allowed to permeate between the core wire and the insulation coating and between the core wires.
(2) A method for water-stopping an electric wire having the configuration (1) above,
The dripping of the water blocking material is performed on the core wire exposed at one end of the insulating coating with the ground terminal fixed by caulking.
(3) A method for water-stopping an electric wire having the configuration (1) above,
The core wire exposed from the other end of the insulating coating is housed in a wire terminal sealed box together with a harness connection terminal that is caulked and fixed to the core wire end.
(4) A method for water-stopping an electric wire having the configuration (1) above,
The other end of the insulating coating is covered with a sealing material together with the core wire end exposed from the other end of the insulating coating.
(5) An electric wire water stop device for infiltrating a water stop material into an insulation coating that wraps a plurality of core wires,
An airtight box in which the core wire is exposed at one end of the insulating coating and the other end of the insulating coating is sealed, and at least the insulating coating on one end side where the core wire is exposed can be stored in a sealed state. When,
An air suction port provided in the airtight box, for sucking air in the airtight box;
A water-stopping material dropping port for dropping the water-stopping material on the core wire, which is provided on the airtight box and exposed at one end of the insulating coating;
An air inlet provided in the airtight box, for introducing air into the airtight box;
With
When the air is introduced into the airtight box from the air inlet, the water-stopping material dripped onto the core wire penetrates between the core wire and the insulation coating and between the core wires.

According to the water stopping method of the above (1) and the water stopping device of the above (5), at least one end portion of the electric wire sealed at the other end is housed in the airtight box, and the air in the airtight box is sucked into the air By degassing through the mouth, air in the insulating coating is degassed from one end of the insulating coating of the electric wire facing the hermetic box. By this deaeration, the inside of the hermetic box and the inside of the insulating coating is depressurized in a vacuum or a low pressure environment close thereto. In this state, a curable liquid waterproof material is dropped on the core wire exposed from the insulating coating at one end of the electric wire. Further, when the air inlet of the airtight box is opened after the water-stopping material is dropped, the capacity and speed according to the pressure reduction level are introduced into the airtight box and the insulating coating in which the atmosphere is in a reduced pressure state through the air inlet. Now, the air flows so as to penetrate between the core wire and the insulation coating at one end and between the core wires. For this reason, all the dripping predetermined amount of water stop materials can be used for the purpose of water stop, and waste due to disposal or the like can be avoided. In addition, the air acts to push the water-stopping material into each of the gaps, so that air can be prevented from being mixed into the water-stopping material.
Moreover, according to the water stop method of said (2), a water stop material is dripped on the core wire fixed by crimping also to the electric wire by which the terminal for earthing was crimped fixed to the core wire exposed at the end of insulation coating. By doing so, it is possible to allow the water blocking material to penetrate between the insulation coating and the core wires in the vicinity of the terminals and between the core wires. Therefore, after the water stop material is cured, it is possible to reliably avoid the intrusion of water into the electric wire from the ground terminal that is easily exposed to water.
Moreover, according to the water stop method of said (3), the other end of the insulation coating of an electric wire and the core wire exposed from this other end can be made into a sealing state by the electric wire terminal sealing box, Suction of air and penetration of the water stop material can be reliably performed with the harness connection terminal attached.
Furthermore, according to the water stop method of (4) above, the other end of the insulating coating of the electric wire and the core wire exposed from the other end can be sealed with a sealing material, and the air in the insulating coating can be sealed. The suction and the infiltration of the water stop material can be reliably performed with the sealing material attached. This sealing material is removed when an electronic component or the like is connected to the core wire.

  According to the present invention, the inside of the insulation coating is brought into a vacuum or a reduced pressure state close to a vacuum, and then returned to the atmospheric pressure, so that the curable water stop material can be surely penetrated between the core wires and the insulation coating and between the core wires without waste. Therefore, it is possible to effectively use the water-stopping material and prevent air bubbles from being mixed into the water-stopping material.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows notionally 1st Embodiment of the water stop apparatus of the electric wire which concerns on this invention. It is explanatory drawing which shows the water stop procedure by the water stop apparatus shown in FIG. It is sectional drawing which shows the application example of 1st Embodiment shown in FIG. It is explanatory drawing which shows the water stop procedure by the water stop apparatus shown in FIG. It is sectional drawing which shows notionally 2nd Embodiment of the water stop apparatus of the electric wire which concerns on this invention. It is explanatory drawing which shows the water stop procedure by the water stop apparatus shown in FIG. It is sectional drawing which shows the application example of 2nd Embodiment shown in FIG. It is explanatory drawing which shows the water stop procedure by the water stop apparatus shown in FIG. It is a front view which shows the fitting structure of the conventional terminal for earth | ground and an earth electric wire. It is explanatory drawing which shows the water stop material osmosis | permeation method of the ground wire shown in FIG.

  FIG. 1 is a cross-sectional view conceptually showing a first embodiment of a water stopping device for electric wires according to the present invention. FIG. 2 is an explanatory diagram showing a water stop procedure by the water stop device shown in FIG. 1. FIG. 3 is a sectional view showing an application example of the first embodiment shown in FIG. FIG. 4 is an explanatory view showing a water stop procedure by the water stop device shown in FIG. FIG. 5: is sectional drawing which shows notionally 2nd Embodiment of the water stop apparatus of the electric wire which concerns on this invention. FIG. 6 is an explanatory diagram showing a water stop procedure by the water stop device shown in FIG. 5. FIG. 7 is a sectional view showing an application example of the second embodiment shown in FIG. FIG. 8 is an explanatory view showing a water stop procedure by the water stop device shown in FIG.

  The water stop device of the first embodiment communicates with an airtight box 51 that forms a sealed space, an air suction port 52 provided so as to communicate with the inside and outside of the airtight box 51, and the inside and outside of the airtight box 51. The water-stopping material dropping port 53 for dropping the water-stopping material and the air introduction port for introducing the air into the air-tight box, which is also provided so as to communicate with the inside and outside of the air-tight box 51. 54.

  Among these, the said airtight box 51 is comprised, for example as a molded article of a synthetic resin, and becomes the structure which can take in and out the below-mentioned electric wire 57 inside. The hermetic box 51 is configured such that a container part and a lid part covering the container part can be coupled and uncoupled via a sealing material. These container portions and lid portions are formed to have a thickness and strength that do not cause deformation, breakage, or air leakage even when the inside of the hermetic box 51 is depressurized to a vacuum or a pressure close to vacuum.

  The air suction port 52 is constituted by a pipe or the like penetrating the inside or outside of the hermetic box 51, and a vacuum pump or the like (not shown) is connected to the outer end of the pipe or the like via a tube or the like. The vacuum pump also has a control means for controlling to a specified value (set value) based on the detected pressure value in the hermetic box 51.

  The water stop material dropping port (water stop material dropping nozzle) 53 is configured to penetrate inside and outside of the airtight box 51, and the water stop material is supplied to the outer end of the water stop material dropping port 53 through, for example, a tube or the like. The tank is connected. The water stop material is supplied to the water stop material dropping port 53 from a water stop material supply tank or the like using a pump or the like.

  As the water stop material, a material having fluidity in an initial state immediately after dropping, soft and elastic after curing, and having good sealing properties is desirable. For example, a silicon resin having a natural curing property or a light curing property, or a polyfunctional monomer such as an epoxy resin, polyethylene, polyester, or polybutadiene acrylate can be used. In this embodiment, as will be described later, when the inside of the airtight box 51 changes from negative pressure to atmospheric pressure, it is necessary to infiltrate the water-stopping material dropped on the core wire between the core wires. In addition, as described above, the waterstop material needs to have fluidity.

  The air introduction port 54 is configured by a through hole, a pipe, or the like that penetrates the inside or outside of the airtight box 51, and an air supply pump, an air supply plug, or the like is connected to an outer end of the pipe. By opening the air supply tap, the inside of the airtight box in a reduced pressure state can be changed to atmospheric pressure. Further, the air supply pump can control the air supply from the negative pressure to the atmospheric pressure direction at a predetermined speed with respect to the pressure in the decompressed airtight box 51.

  Next, the water stop method by the water stop apparatus comprised in this way is demonstrated with reference to Fig.2 (a)-FIG.2 (e). Here, the case where this water stop method is applied to the electric wire 57 in which the grounding terminal 55 is fixed at one end and the harness connection terminal 56 is fixed at the other end will be described.

  First, the electric wire 57 having the ground terminal 55 and the harness connection terminal 56 is accommodated in an airtight box 51. In the hermetic box 51, the terminals 55 and 56 together with the electric wire 57 are supported so as to be substantially straight and not to move, rotate, or rattle. And in the connection part of the terminal 55 for earth | grounding, the end of the electric wire 57 is located directly under the water stop material dripping port 53. FIG. The electric wire 57 includes a plurality of core wires 58 that are internal conductors, and an insulating coating 59 that is covered so as to wrap around the core wires 58. At one end of the electric wire 57, the insulation coating 59 is removed by a predetermined length, and a part (end portion) of the core wire 58 is exposed.

  The ground terminal 55 is formed by bending a metal plate and integrally includes a ground connection portion 60 connected to the body ground, a conductor side barrel 61, and an insulation side barrel 62. The conductor side barrel 61 is caulking and fixing the core wire 58, and the insulating side barrel 62 is caulking and fixing the end of the insulating coating 59. The water blocking material dropping port 53 faces directly above the core wire 58 exposed between the barrels 61 and 62.

  On the other hand, the harness connection terminal 56 has a form different from that of the ground terminal 55 for connection with other electric wires. The barrel of the harness connection terminal 56 and the caulking and fixing of the core wire 58 and the insulating coating 59 by the barrel are substantially the same as in the case of the ground terminal 55, and thus redundant description thereof is omitted. Further, the harness connection terminal 56 is housed in the electric wire terminal sealed box 63 that is tightly fitted to the other end portion of the insulating coating 59 together with the other end portion of the insulating coating 59. Therefore, the other end of the insulating coating 59 of the electric wire 57 is sealed so as not to allow ventilation.

  Next, the air in the airtight box 51 containing the electric wires 57 having the ground terminals 55 and the harness connection terminals 56 at both ends as described above is sucked from the air suction port 52 by driving the vacuum pump. FIG. 2A shows this air suction operation. At this time, the water stop material dropping port 53 and the air introduction port 54 are closed, and the dripping of the water stop material and the introduction of the air into the airtight box 51 are stopped. By the suction of the air, the inside of the airtight box 51 is depressurized, and further, the inside of the insulating coating 59 of the electric wire 57 is sucked from one end on the ground terminal 55 side and depressurized. By this decompression step, the inside of the airtight box 51 and the insulating coating 59 reach a vacuum or a decompression level close to this vacuum, and at this time, the air suction operation is stopped.

  When the air suction operation is stopped, the air suction port 52 is closed and then the water stop material dropping port 53 is opened as shown in FIG. In this case, as shown in FIG. 2C, the liquid water stop material 64 is dropped from the water stop material supply tank onto the dropping position in the airtight box 51, that is, onto the core wire 58 between the barrels 61 and 62. For this reason, the water-stopping material 64 stays on the core wire 58 in a temporarily piled state, and a small amount of the water-stopping material 64 is initially placed between the core wire 58 and the insulating coating 59 in the vicinity of the ground terminal 55. It penetrates between the core wires 58.

  After the water-stopping material 64 is dropped on the core wire 58 in a predetermined amount, the water-stopping material dropping port 53 is closed as shown in FIG. Then, the air inlet 54 is opened. As a result, the outside air (atmosphere) enters the airtight box 51 from the atmosphere introduction port 54 at once or a predetermined amount. For this reason, the inside of the airtight box 51 changes from a predetermined negative pressure state to an atmospheric pressure state, and the insulating coating 59 of the electric wire 57 also changes from one end (opening end) side to the atmospheric pressure state. The water stop material 64 on the core wire 58 exposed from the insulating coating 59 on the grounding terminal 55 side by the pressure change from the negative pressure to the atmospheric pressure state receives the pressure change and the other end side (in the insulating coating 59 ( It is drawn (inhaled) for a moment to the negative pressure side).

  During the pull-in operation of the water blocking material 64, the water blocking material 64 flows into the other end side in the insulating coating 59 while oozing between the core wire 58 and the insulating coating 59 and between the core wires 58. As shown in FIG. 2 (e), when the water stop material 64 reaches a predetermined amount or position, the intake into the airtight box 51 is stopped, the air inlet 54 is closed, Leave for hours. Thereby, the water stop material 64 is gradually cured and becomes a soft elastic sealing material. For this reason, the movement of water is restricted between the core wire 58 and the insulation coating 59 and between the core wires 58 at a position where the cured water stop material 64 is present. Therefore, there is no possibility of water leaking from the ground terminal 55 side to the harness terminal 56 side through the insulating coating 59.

  Thereby, corrosion of the harness terminal 56 part, insulation deterioration, electric leakage, etc. can be avoided in advance. In addition, the water stop material 64 soaked between the core wires 58 from one end of the insulating coating 59 does not leak from the other end. For this reason, it is possible to avoid unnecessary waste of the water-stopping material 64 by determining an appropriate value of the dripping amount of the water-stopping material 64 in advance. In addition, since air is not forcibly supplied to the water stop material 64, there is no possibility that air bubbles are mixed into the water stop material 64.

  FIG. 3 shows an example in which the wire end sealed box 63 attached to the other end of the wire 57 is arranged outside the airtight box 51. In this example, it is necessary to pass through the one side wall of the hermetic box 51 through the electric wire 57 where the electric wire end sealed box 63 is provided. For this reason, the through hole 51a provided in the side wall and the electric wire 57 penetrating through the through hole 51a. A sealing material 65 is interposed therebetween. This example is suitable when the total length of the electric wire 57 including the ground terminal 55 and the harness connection terminal 56 is larger than the size (length) of the hermetic box 51. Each operation | movement of dripping of the water stop material 64 and the air | atmosphere introduction in the airtight box 51 is implemented sequentially like the above.

  FIG. 4A to FIG. 4D show the water stop process in this example. The water stop process by the water stop material 64 is substantially the same as the water stop process described with reference to FIGS. 2 (a) to 2 (d). In this case, even if the wire terminal sealing box 63 that seals the harness connection terminal 56 is outside the airtight box 51, the insulation coating 59 is blocked by the wire terminal sealing box 63 at the other end of the wire 57. ing. For this reason, the pressure reduction in the insulating coating 59 in the air suction step and the permeation operation of the water blocking material 64 into the insulating coating 59 in the air introduction step are performed in the same manner as described above.

  First, the electric wire 57 having the ground terminal 55 is accommodated in the airtight box 51. The wire terminal sealed box 63 is taken out of the airtight box 51 as described above. In the hermetic box 51, the grounding terminal 55 and the electric wire 57 are supported so as to be substantially straight and not to move or rotate. Further, one end of the electric wire 57 is positioned immediately below the water stop material dropping port 53 at the connection portion of the ground terminal 55. The electric wire 57 has a plurality of core wires 58 that are internal conductors, and an insulating coating 59 that is covered so as to wrap these core wires 58. At one end of the electric wire 57, the insulation coating 59 is removed by a predetermined length, and a part (end portion) of the core wire 58 is exposed for a predetermined length.

  The ground terminal 55 is formed by bending a metal plate and integrally includes a ground connection portion 60 connected to the body ground, a conductor side barrel 61, and an insulation side barrel 62. The conductor side barrel 61 is caulking and fixing the core wire 58, and the insulating side barrel 62 is caulking and fixing the end of the insulating coating 59. The water blocking material dropping port 53 faces directly above the core wire 58 exposed between the barrels 61 and 62.

  On the other hand, the harness connection terminal 56 has a form different from that of the grounding terminal 55 for connection to other electric wires, but is arranged outside the airtight box 51. The harness connection terminal 56 barrel and the caulking and fixing of the core wire 58 and the insulation coating 59 by the barrel are substantially the same as in the case of the ground terminal 55, and therefore, redundant description thereof is omitted. Further, the harness connection terminal 56 is housed in the electric wire terminal sealed box 63 that is tightly fitted to the other end portion of the insulating coating 59 together with the other end portion of the insulating coating 59. Therefore, the other end of the insulating coating 59 of the electric wire 57 is sealed so as not to allow ventilation.

  Next, the air in the airtight box 51 containing the electric wire 57 having the ground terminal 55 is sucked from the air suction port 52 by driving the vacuum pump. FIG. 4A shows an air suction operation in the hermetic box 51. At this time, the water stop material dropping port 53 and the air introduction port 54 are closed, and the dripping of the water stop material and the introduction of the air into the airtight box 51 are stopped. By the suction of the air, the inside of the airtight box 51 is depressurized, and further, the inside of the insulating coating 59 of the electric wire 57 is sucked from one end on the grounding terminal 55 side and depressurized. When the inside of the airtight box 51 and the inside of the insulating coating 59 reach a vacuum or a predetermined pressure reduction level close to a vacuum by this decompression step, the air suction operation is stopped.

  When the air suction operation is stopped, as shown in FIG. 4B, the air suction port 52 is closed and then the water stop material dropping port 53 is opened. At this time, as shown in FIG. 4C, the liquid water stop material 64 is dropped from the water stop material supply tank onto the dripping position in the airtight box 51, that is, onto the core wire 58 between the barrels 61 and 62. For this reason, the water stop material 64 stays on the core wire 58 in a state where it is temporarily piled up, and a small amount of the water stop material 64 is between the core wire 58 near the grounding terminal 55 and the insulation coating 59 and between the core wires. It tries to ooze between 58.

  After the water-stopping material 64 is dropped on the core wire 58 in a predetermined amount, the water-stopping material dropping port 53 is closed as shown in FIG. Stop. Subsequently, the air inlet 54 is opened as shown in FIG. As a result, the outside air (atmosphere) enters the airtight box 51 from the atmosphere introduction port 54 at once or a predetermined amount. For this reason, the inside of the airtight box 51 changes from a predetermined negative pressure state to an atmospheric pressure state, and the insulating coating 59 of the electric wire 57 also changes from one end (opening end) side to the atmospheric pressure state. Due to the pressure change from the negative pressure to the atmospheric pressure state, the water stop material 64 on the core wire 58 exposed from the insulating coating 59 on the grounding terminal 55 side receives the pressure change and moves to the other end side in the insulating coating 59. It is drawn for a moment.

  During the pull-in operation of the water blocking material 64, the water blocking material 64 flows into the other end side in the insulating coating 59 while oozing between the core wire 58 and the insulating coating 59 and between the core wires 58. Then, when the water stop material 64 reaches a predetermined amount or position, air intake into the airtight box 51 is stopped, the air inlet 54 is closed, and left for a predetermined time. Thereby, the water stop material 64 is gradually cured and becomes a soft elastic sealing material. For this reason, the movement of water between the core wires 58 and the insulation coating 59 and between the core wires 58 is restricted at a position where the cured water stop material 64 is present. Therefore, there is no possibility that water leaks from the ground terminal 55 side through the insulating coating 59 to the harness terminal 56 side outside the hermetic box 51.

  Thereby, corrosion of the harness terminal 56 part, insulation deterioration, electric leakage, etc. can be avoided in advance. In addition, the water stop material 64 soaked between the core wires 58 from one end of the insulating coating 59 does not leak from the other end. For this reason, it is possible to avoid unnecessary waste of the water-stopping material 64 by determining an appropriate value of the dripping amount of the water-stopping material 64 in advance. In addition, since air is not forcibly supplied to the water-stopping material, there is no possibility that air bubbles are mixed in the water-stopping material 64.

  5 and 6 show a second embodiment of the water stopping device for electric wires. The water stop device of the second embodiment includes an airtight box 51 that forms a sealed space, an air suction port 52 that is provided so as to communicate with the inside and outside of the airtight box 51, and a communication between the inside and outside of the airtight box 51. An air introduction for introducing the air into the airtight box provided to communicate with the inside and outside of the airtight box 51, and the water stop material dropping port 53 for dropping the waterstop material. And a mouth 54.

  Among these, the said airtight box 51 is comprised, for example as a molded article of a synthetic resin, and becomes the structure which can take in and out the below-mentioned electric wire 57 inside. The hermetic box 51 is configured such that a container part and a lid part covering the container part can be coupled and uncoupled with each other via a sealing material. These container portions and lid portions are formed to have a thickness and strength that do not cause deformation, breakage, or air leakage even when the inside of the hermetic box 51 is depressurized to a vacuum or a pressure close to vacuum.

  The air suction port 52 is constituted by a pipe or the like penetrating the inside or outside of the hermetic box 51, and a vacuum pump or the like (not shown) is connected to the outer end of the pipe or the like via a tube or the like. The vacuum pump also has a control means for controlling to a specified value (set value) based on the detected pressure value in the hermetic box 51.

  The water stop material dropping port (water stop material dropping nozzle) 53 is configured to penetrate inside and outside of the airtight box 51, and the water stop material is supplied to the outer end of the water stop material dropping port 53 through, for example, a tube or the like. The tank is connected. The water stop material is supplied to the water stop material dropping port 53 from a water stop material supply tank or the like using a pump or the like.

  As the water stop material, a material having fluidity in an initial state immediately after dropping, soft and elastic after curing, and having good sealing properties is desirable. For example, a silicon resin having a natural curing property or a photocuring property, or a polyfunctional monomer such as an epoxy resin, polyethylene, polyester, polybutadiene acrylate, or the like can be used. In this embodiment, as will be described later, when the inside of the airtight box 51 changes from negative pressure to atmospheric pressure, it is necessary to infiltrate the water-stopping material dropped on the core wire between the core wires. In addition, as described above, the waterstop material needs to have fluidity.

  The air introduction port 54 is configured by a through hole, a pipe, or the like that penetrates the inside or outside of the airtight box 51, and an air supply pump, an air supply plug, or the like is connected to an outer end of the pipe. By opening the air supply tap, the inside of the airtight box in a reduced pressure state can be changed to atmospheric pressure. Further, the air supply pump can control the air supply from the negative pressure to the atmospheric pressure direction at a predetermined speed with respect to the pressure in the decompressed airtight box 51.

  Next, the water stop method by the water stop apparatus comprised in this way is demonstrated concretely with reference to Fig.6 (a)-FIG.6 (e). Here, a case will be described in which the present invention is applied to an electric wire 57 in which a ground terminal 55 is caulked and fixed at one end and a sealing material 66 such as a sealing plug is attached to the other end.

  First, the electric wire 57 having the ground terminal 55 and the sealing material 66 is housed in an airtight box 51. In the airtight box 51, the ground terminal 55 and the sealing material 66 are supported together with the electric wires 57 so as to be substantially straight and not to move or rotate. And in the connection part of the terminal 55 for earth | grounding, the end of the electric wire 57 is located directly under the water stop material dripping port 53. FIG. The electric wire 57 has a plurality of core wires 58 that are internal conductors and an insulating coating 59 that surrounds the core wires 58. At one end of the electric wire 57, the insulation coating 59 is removed by a predetermined length, and a part (end portion) of the core wire 58 is exposed.

  The ground terminal 55 is formed by bending a metal plate and integrally includes a ground connection portion 60 connected to the body ground, a conductor side barrel 61, and an insulation side barrel 62. The conductor side barrel 61 is caulking and fixing the core wire 58, and the insulating side barrel 62 is caulking and fixing the end of the insulating coating 59. The water blocking material dropping port 53 faces directly above the core wire 58 exposed between the barrels 61 and 62.

  On the other hand, the sealing member 66 is a rubber plug cap or adhesive that covers the vicinity of the end of the insulating coating 59, which is the other end of the electric wire 57, so that it does not easily fall off from the end of the insulating coating 59 and is airtight. Thus, the end opening is closed. The sealing material 66 is housed in the airtight box 51 together with the other end of the insulating coating 59.

  Next, the air in the airtight box 51 containing the electric wire 57 having the ground terminal 55 and the sealing material 66 at both ends as described above is sucked by driving the vacuum pump with the air suction port 52 opened. To do. FIG. 6A shows the air suction operation in the hermetic box 51. At this time, the water stop material dropping port 53 and the air introduction port 54 are closed, and the dripping of the water stop material and the introduction of the air into the airtight box 51 are stopped. By the suction of the air, the inside of the airtight box 51 is depressurized, and further, the inside of the insulating coating 59 of the electric wire 57 is sucked from one end on the ground terminal 55 side and depressurized. By this decompression step, the inside of the airtight box 51 and the insulating coating 59 reach a vacuum or a decompression level close to this vacuum, and at this time, the air suction operation is stopped.

  When the air suction operation is stopped, the air suction port 52 is closed as shown in FIG. 6B, the water stop material dropping port 53 is opened, and the water stop port is opened as shown in FIG. 6C. A liquid waterproofing material 64 is dropped from the material supply tank onto the dropping position in the airtight box 51, that is, onto the core wire 58 between the barrels 61 and 62. For this reason, the water-stopping material 64 stays on the core wire 58 in a state where it is temporarily piled up. At first, a small amount of the water-stopping material 64 is between the core wire 58 and the insulating coating 59 in the vicinity of the ground terminal 55. Or it will be in the state which can bleed between each core wire 58. FIG.

  After the water-stopping material 64 is dropped on the core wire 58 by a predetermined amount, the water-stopping material dropping port 53 is closed as shown in FIG. 6 (d), and the further water-stopping material 64 is dropped. Then, the air inlet 54 is opened as shown in FIG. As a result, the outside air (atmosphere) enters the airtight box 51 from the atmosphere introduction port 54 at once or a predetermined amount. For this reason, the inside of the airtight box 51 changes from a predetermined negative pressure state to an atmospheric pressure state, and the insulating coating 59 of the electric wire 57 also changes from one end (opening end) side to the atmospheric pressure state. The water stop material 64 on the core wire 58 exposed from the insulating coating 59 on the grounding terminal 55 side by the pressure change from the negative pressure to the atmospheric pressure state receives the pressure change and the other end side (in the insulating coating 59 ( The suction side is pulled in for a moment.

  During the pull-in operation of the water blocking material 64, the water blocking material 64 flows into the other end side in the insulating coating 59 while oozing between the core wire 58 and the insulating coating 59 and between the core wires 58. Then, when the water stop material 64 reaches a predetermined amount or position, air intake into the airtight box 51 is stopped, the air inlet 54 is closed, and left for a predetermined time. Thereby, the water stop material 64 is gradually cured and becomes a soft elastic sealing material. For this reason, the movement of water is restricted between the core wire 58 and the insulation coating 59 and between the core wires 58 at a position where the cured water stop material 64 is present. Therefore, there is no possibility of water leaking from the ground terminal 55 side through the insulating coating 59 to the outside of the sealing material 66.

  Thereby, corrosion of various electronic components connected to the core wire exposed after the sealing material 66 is removed, insulation deterioration, electric leakage, etc. can be avoided in advance. In addition, the water stop material 64 soaked between the core wires 58 from one end of the insulating coating 59 does not leak from the other end. For this reason, it is possible to avoid unnecessary waste of the water-stopping material 64 by determining an appropriate value of the dripping amount of the water-stopping material 64 in advance. In addition, since air supply is not forcibly brought into contact with the water-stopping material 64, there is no possibility that air bubbles are mixed into the water-stopping material 64.

  FIG. 7 shows an example in which the sealing material 66 is arranged outside the airtight box 51. In this example, it is necessary to pass through the one side wall of the hermetic box 51 through the electric wire 57 in a portion where the sealing material 66 is provided. For this reason, the sealing material 65 is interposed between the through-hole 51a of the electric wire 57 and the electric wire 57 penetrated by this through-hole 51a. This example is suitable when the total length of the electric wire 57 including the ground terminal 55 and the sealing material 66 is larger than the size of the airtight box 51, and intake air from the inside of the airtight box 51 and dropping of the water stop material 64 onto the core wire 58. And each operation | movement of the air | atmosphere introduction in the airtight box 51 is implemented sequentially like the above.

Fig.8 (a)-FIG.8 (d) show the water stop process in this example.
In this case, even if the sealing member 66 that seals the other end of the electric wire 57, that is, the other end of the insulating coating 59, is outside the hermetic box 51, the insulating coating 59 is connected to the sealing member 66 at the other end of the electric wire 57. It is blocked by. For this reason, the pressure reduction in the insulating coating 59 in the air suction step and the permeation operation of the water blocking material 64 into the insulating coating 59 in the air introduction step are performed in the same manner as described above.

  First, the electric wire 57 having the ground terminal 55 is accommodated in the airtight box 51. The other end of the electric wire 57 including the sealing material 66 is taken out of the airtight box 51 as described above. In the hermetic box 51, the electric wire 57 having the grounding terminal 55 is supported so as to be substantially straight and not to move or rotate. Further, the connecting portion between the core wire 58 and the grounding terminal 55 is positioned directly below the water stop material dropping port 53. The electric wire 57 has a plurality of core wires 58 that are internal conductors, and an insulating coating 59 that is covered so as to wrap these core wires 58. At one end of the electric wire 57, the insulating coating 59 is removed by a predetermined length, and the core wire 58 is partially exposed.

  The ground terminal 55 is formed by bending a metal plate and integrally includes a ground connection portion 60 connected to the body ground, a conductor side barrel 61, and an insulation side barrel 62. The conductor side barrel 61 is caulking and fixing the core wire 58, and the insulating side barrel 62 is caulking and fixing the end of the insulating coating 59. The water blocking material dropping port 53 faces directly above the core wire 58 exposed between the barrels 61 and 62.

  On the other hand, the sealing material 66 that seals the other end of the electric wire 57 is separated after the water stop treatment and is used for mounting other electronic components, etc., but in the water stop process, as shown in the figure outside the airtight box 51. Be placed. The other end portion of the insulating coating 59 of the electric wire 57 is made impermeable by the sealing material 66.

  Next, the air in the airtight box 51 containing the electric wire 57 having the ground terminal 55 is sucked from the air suction port 52 by driving the vacuum pump. FIG. 8A shows the air suction operation in the airtight box 51. At this time, the water stop material dropping port 53 and the air introduction port 54 are closed, and the dripping of the water stop material 64 and the introduction of the air into the airtight box 51 are stopped. By the suction of the air, the inside of the airtight box 51 is depressurized, and further, the inside of the insulating coating 59 of the electric wire 57 is sucked from one end on the grounding terminal 55 side and depressurized. When the inside of the airtight box 51 and the inside of the insulating coating 59 reach a vacuum or a predetermined pressure reduction level close to a vacuum by this decompression step, the air suction operation is stopped.

  When the air suction operation is stopped, the air suction port 52 is closed and then the water stop material dropping port 53 is opened as shown in FIG. At this time, as shown in FIG. 8C, the liquid water stop material 64 is dropped from the water stop material supply tank onto the dropping position in the airtight box 51, that is, onto the core wire 58 between the barrels 61 and 62. For this reason, the water blocking material 64 stays on the core wire 58 in a temporarily piled state, and a small amount of the water blocking material 64 is between the core wire 58 near the grounding terminal 55 and the insulation coating 59 and between the core wires 58. It becomes possible to ooze in between.

  After the water-stopping material 64 is dropped on the core wire 58 in a predetermined amount, the water-stopping material dropping port 53 is closed as shown in FIG. Then, the air inlet 54 is opened as shown in FIG. As a result, the outside air (atmosphere) is supplied from the atmosphere introduction port 54 into the airtight box 51 at once or a predetermined amount. For this reason, the inside of the airtight box 51 changes from a predetermined negative pressure state to an atmospheric pressure state, and the insulating coating 59 of the electric wire 57 also changes from one end (opening end) side to the atmospheric pressure state. Due to the pressure change from the negative pressure to the atmospheric pressure state, the water stop material 64 on the core wire 58 exposed from the insulating coating 59 on the grounding terminal 55 side receives the pressure change and moves to the other end side in the insulating coating 59. It is drawn for a moment.

  During the pull-in operation of the water-stopping material 64, the water-stopping material 64 penetrates between the core wire 58 and the insulating coating 59 and between the core wires 58, while moving to the other end side in the insulating coating 59, that is, the sealing material 66 side. Flows in. When the water stop material 64 reaches a predetermined amount or position, the supply of air into the airtight box 51 is stopped, the air inlet 54 is closed, and the air is left for a predetermined time. Thereby, the water stop material 64 is gradually cured and becomes a soft elastic sealing material. For this reason, the movement of water between the core wires 58 and the insulation coating 59 and between the core wires 58 is restricted at a position where the cured water stop material 64 is present. Therefore, there is no possibility that water leaks from the other end of the electric wire 57 outside the hermetic box 51 through the insulating coating 59 from the ground terminal 55 side.

  As a result, water is transmitted from the grounding terminal side to the electronic component connected to the end of the core wire 58 exposed after the sealing material 66 is removed, and the electronic component is corroded or deteriorated. It is possible to avoid leakage of electricity. In addition, the water stop material 64 soaked between the core wires 58 from one end of the insulating coating 59 does not leak from the other end. For this reason, it is possible to reduce unnecessary waste of the water-stopping material 64 by determining an appropriate value of the dripping amount of the water-stopping material 64 in advance. Further, since compressed air is not forced to act on the water stop material 64, there is no possibility that air bubbles are mixed in the water stop material 64.

  As described above, according to the present embodiment, at least one end of the wire 57 in which the core wire 58 is exposed at one end of the insulating coating 59 and the other end of the insulating coating 59 is sealed. The side insulation coating 59 is stored in a hermetically sealed state in the airtight box 51, air in the airtight box 51 is sucked from an air suction port 52 provided in the airtight box 51, and a water stop material dropping port is sucked after the air is sucked. The water-stopping material 64 is dropped on the core wire 58 exposed at one end of the insulating coating 59 from 53, and air is introduced into the air-tight box 51 from the air inlet 54 provided in the air-tight box 51 after the water-stopping material 64 is dropped. Then, when the atmosphere is introduced into the airtight box 51 from the atmosphere introduction port 54, the water blocking material 64 dropped onto the core wire 58, the core wire 58, the insulation coating 59, and the core wires 58 are permeated. ing.

  Thereby, the inside of the insulation coating 59 of the electric wire 57 having the core wire 58 is brought into a vacuum or a reduced pressure environment close to a vacuum, and then returned to the atmospheric pressure, whereby the curability is set between the core wire 58 and the insulation coating 59 and between each core wire 58. The water stop material 64 can be surely penetrated without waste, so that the water stop material 64 can be effectively used and air bubbles can be prevented from being mixed into the water stop material 64.

  Further, the water-stopping material 64 is dropped on the core wire 58 exposed at one end of the insulating coating 59 to which the grounding terminal 55 is fixed by caulking, so that the air is introduced into the airtight box 51 on one end of the core wire 58. The waterstop material 64 dripped onto the wire 57 can be efficiently infiltrated into the insulating coating of the electric wire 57.

  Furthermore, the core wire 58 exposed from the other end of the insulating coating 59 is housed in the wire terminal sealing box 63 together with the harness connection terminal 56 that is caulked and fixed to the end of the core wire 58. As a result, the other end of the insulating coating 59 of the electric wire 57 and the core wire 58 exposed from the other end can be sealed by the electric wire terminal sealing box 63, and the air in the insulating coating 59 is sucked and water-stopping material. 64 can be reliably carried out with the harness connection terminal 56 attached.

  Further, the other end of the insulating coating 59 is covered with a sealing material 66 together with the end of the core wire 58 exposed from the other end of the insulating coating 59, whereby the other end of the insulating coating 59 of the electric wire 57 and the core wire exposed from the other end. 58 can be sealed by the sealing material 66, and the suction of the air in the insulating coating 59 and the penetration of the water blocking material 64 can be reliably performed with the sealing material 66 attached.

51 Airtight box 52 Air suction port 53 Water-stopping material dropping port 54 Air introduction port 55 Grounding terminal 56 Harness connection terminal 57 Electric wire 58 Core wire 59 Insulation coating 60 Earth connection part 61 Conductor side barrel 62 Insulation side barrel 63 Wire end sealing box 64 Sealing material 65 Sealing material 66 Sealing material

Claims (5)

A method of water stopping a wire in which a water blocking material is infiltrated into an insulating coating enclosing a plurality of core wires,
Among the electric wires in which the core wire is exposed at one end of the insulating coating and the other end of the insulating coating is sealed, at least the insulating coating on one end side where the core wire is exposed is stored in an airtight box in a sealed state. Wire storage step to perform,
An air suction step for sucking air in the airtight box from an air suction port provided in the airtight box;
A water-stopping material dropping step for dropping a water-stopping material on the core wire exposed at one end of the insulating coating from the water-stopping material dropping port provided in the airtight box after the suction of air;
An air introduction step for introducing air into the airtight box from the air introduction port provided in the airtight box after completion of dropping of the water blocking material;
Have
When the air is introduced into the airtight box from the air introduction port, the water stop material dripped onto the core wire is allowed to permeate between the core wire and the insulation coating and between the core wires. Water stop method.   The method for water-stopping an electric wire according to claim 1, wherein the water-stopping material is dropped on the core wire exposed at one end of the insulating coating with a ground terminal fixed by caulking.   The method for water-stopping an electric wire according to claim 1, wherein the core wire exposed from the other end of the insulating coating is housed in a wire terminal sealed box together with a harness connection terminal that is caulked and fixed to the end of the core wire.   The method for water-stopping an electric wire according to claim 1, wherein the other end of the insulating coating is covered with a sealing material together with a core wire end exposed from the other end of the insulating coating. A water-stop device for an electric wire that penetrates a water-stop material into an insulation coating that wraps a plurality of core wires,
An airtight box in which the core wire is exposed at one end of the insulating coating and the other end of the insulating coating is sealed, and at least the insulating coating on one end side where the core wire is exposed can be stored in a sealed state. When,
An air suction port provided in the airtight box, for sucking air in the airtight box;
A water-stopping material dropping port for dropping the water-stopping material on the core wire, which is provided on the airtight box and exposed at one end of the insulating coating;
An air inlet provided in the airtight box, for introducing air into the airtight box;
With
When the atmosphere is introduced into the airtight box from the atmosphere introduction port, the water stop material dripped onto the core wire penetrates between the core wire and the insulation coating, and between each core wire. Water stop device.

Images