JP5441254B2 - 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.

  FIG. 9 is a plan view of a grounding terminal portion in which the grounding wire is water-stopped through the above steps. In FIG. 9, the grounding electric wire 10 has an inner conductor 12 and a covering material 14 disposed around the inner conductor 12, and the covering material 14 is made of an electrical insulating material. By removing the covering material 14 of one end 16 of the grounding wire 10 by a predetermined length, a process for exposing the internal conductor 12 is performed.

  The grounding terminal 20 is crimped and fixed to the processing side terminal 16. The grounding terminal 20 is formed by bending a single metal plate, and includes a ground connection portion 21 connected to a vehicle body ground, a conductor barrel 22 located behind the ground connection portion, and insulation. The barrel 24 is integrally formed. The ground connection portion 21 is provided with a bolt insertion hole 21a through which a bolt can be inserted, and the bolt fastens the ground connection portion 21 to an appropriate ground portion of the vehicle. By this fastening, the inner conductor 12 of the grounding wire 10 is connected to the vehicle ground via the grounding terminal 20.

  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

  In the conventional water stopping method for electric wires described above, 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. After that, it is discharged together with the compressed air from the other end (open end) of the grounding wire 10 facing 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 (2).
(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,
Of 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 the one end side where the core wire is exposed is stored in an airtight chamber in a sealed state. Wire storage step;
An air suction step for sucking air in the airtight chamber from an air suction port provided in the airtight chamber;
After the water-stopping material dropped from the water-stopping material dropping port provided in the airtight chamber after the air is sucked into the water-stopping material pouring member, the insulating coating is applied from the lower end of the water-stopping material pouring member. A water-stopping material dripping step for dripping intensively at a designated site on the core wire exposed at one end of the core,
An air introduction step for introducing air into the airtight chamber from an air inlet provided in the airtight chamber;
Have
When the air is introduced into the airtight chamber 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) An electric wire water stop device for infiltrating a water stop material between a plurality of core wires wrapped in an insulation coating,
An airtight chamber for accommodating in a sealed state at least one insulating coating on one end side where the core wire is exposed 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. ,
An air suction port provided in the hermetic chamber for sucking air in the hermetic chamber;
A water-stop material dropping port provided in the hermetic chamber for dripping the water-stop material intensively onto a designated portion on the core wire exposed at one end of the insulating coating using a water-stop material pouring member;
An air inlet provided in the airtight chamber, for introducing air into the airtight chamber;
With
When the atmosphere is introduced from the atmosphere introduction port into the airtight chamber that has been brought to a vacuum or a state close to a vacuum by the air suction, the water-stopping material dropped on the core wire is between the core wire and the insulation coating, And penetrate between each core wire.

  According to the water stop method of (1) and the water stop device of (2), at least one end of the electric wire sealed at the other end is housed in an airtight chamber, and the air in the airtight chamber is passed through an air suction port. By deaeration, air in the insulating coating is deaerated from one end of the insulating coating of the electric wire facing the hermetic chamber. By this deaeration, the inside of the hermetic chamber 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 water-stopping material is concentratedly dropped onto a predetermined portion on the core wire exposed from the insulating coating at one end of the electric wire. Further, when the air inlet of the airtight chamber is opened after the water-stopping material is dropped, the capacity and speed corresponding to the pressure reduction level are entered into the airtight chamber and the insulating coating in which the atmosphere is in a reduced pressure state through the air inlet. Thus, the liquid flows into the core wire at one end and between the insulation coatings and between the core wires without efficiently diffusing in the vicinity. 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 the gaps, so that air can be prevented from being mixed into the water-stopping material.

  According to the present invention, the inside of the insulation coating is made into a vacuum or a reduced pressure state close to a vacuum and then returned to the atmospheric pressure, so that the pressure change from the reduced pressure to the atmospheric pressure is effectively utilized, and between the core wire and the insulation coating and each core wire. This makes it possible to infiltrate curable water-stopping materials without any waste, so that water can be prevented from entering the wires while effectively using the water-stopping material and preventing air bubbles from entering the water-stopping material. can do.

  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 of the electric wire 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 of the electric wire 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 of the electric wire 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 of the electric wire 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.

DESCRIPTION OF EXEMPLARY EMBODIMENTS A preferred embodiment of a water stopping method and a water stopping device according to the present invention will be described below with reference to the drawings. In addition, it demonstrates taking the case of the electric wire which connected the earthing terminal to the end as a water stop object.
Here, FIG. 1 is a cross-sectional view conceptually showing the first embodiment of the 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 diagram showing a water stop procedure by the water stop device shown in FIG. 3. 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 stopping procedure by the electric water stopping device shown in FIG. 7.

  The water stop device for the electric wire according to the first embodiment includes an airtight chamber 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 chamber 51, and the inside and outside of the airtight chamber 51. A water-stopping material dropping port 53 for dropping a water-stopping material provided so as to communicate with the air introduction for introducing air into the air-tight chamber, which is also provided so as to communicate with the inside and outside of the air-tight chamber 51. And a mouth 54.

  Among these, the said airtight chamber 51 is comprised, for example as a molded article of a synthetic resin, and becomes the structure which can insert / extract the below-mentioned electric wire 57 inside. Accordingly, the hermetic chamber 51 is configured such that, for example, 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 thicknesses and strengths that do not cause deformation, breakage, or air leakage even when the inside of the airtight chamber 51 is depressurized to a vacuum or a pressure close to vacuum.

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

  The water stop material dropping port (water stop material dropping nozzle) 53 is configured to penetrate inside and outside of the airtight chamber 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 from the water stop material supply tank to the water stop material dropping port 53 and the water stop material extraction member (funnel) 70 using a pump or the like.

  The water-stopping material injection member 70 has a funnel shape with an upper portion having a large diameter and a lower portion having a small diameter, and is provided so as to be positioned directly below the water-stopping material dropping port 53. The reason why the upper portion has a large diameter is to absorb (allow) a shift in the relative position between the water stop material dropping port 53 and the water stop material pouring member 70. Thereby, the liquid water-stopping material dropped from the water-stopping material dropping port 53 can be reliably received in the water-stopping material dispensing member 70. In addition, by using this water stop material pouring member 70, the liquid water stop material dripped from the water stop material dropping port 53 can be reliably concentrated on the core wire 58 connected to the below-mentioned earth terminal. .

  Further, the lower end portion of the water blocking material extraction member 70 has a small diameter as described above, but the tip (lower end) thereof is disposed above the core wire 58 exposed from between the barrels 61 and 62 as will be described later. For this reason, the electric wire 57 is positioned in the airtight chamber 51 so that the core wire 58 exposed between the barrels 61 and 62 is located immediately below the lower end of the water blocking material extraction member 70. In addition, the water stop material pouring member 70 has a size (diameter) corresponding to the diameter of the core wire 58.

  As the water-stopping material, it is desirable to have fluidity in the initial state immediately after dropping, solidify after dropping but have flexibility and elasticity and good sealing properties. 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 the present embodiment, as will be described later, when the inside of the airtight chamber 51 changes from negative pressure to atmospheric pressure, it is necessary to infiltrate the water-stopping material dripped on the core wire between the core wires. In addition, as described above, the water-stopping material needs to maintain fluidity for a predetermined time.

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

  Next, the water stop method by the water stop apparatus of the electric wire comprised in this way is demonstrated with reference to Fig.2 (a)-FIG.2 (e). Here, the case where this water stopping method is applied to an electric wire 57 in which the ground 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 grounding terminal 55 and the harness connection terminal 56 is accommodated in the airtight chamber 51. In the hermetic chamber 51, a support means (not shown) is used to support the terminals 55 and 56 together with the electric wire 57 so that the terminals 55 and 56 do not 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 insulating coating 59 is removed (peeled) 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 of the vehicle body, a conductor side barrel 61, and an insulation side barrel 62. The conductor side barrel 61 is caulking and fixing the end portion of the core wire 58, and the insulating side barrel 62 is caulking and fixing the end portion of the insulating coating 59. As shown in FIG. 1, the lower end of the water blocking material pouring member 70 is made to face directly above the core wire 58 exposed from the insulating coating 59 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 chamber 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 chamber 51 are stopped. By the suction of the air, the inside of the airtight chamber 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. By this decompression step, the inside of the hermetic chamber 51 and the insulating coating 59 reach a vacuum or a predetermined decompression level close to this vacuum, and at this time, the air suction operation is stopped.

  When the air suction operation is stopped, as shown in FIG. 2B, the air suction port 52 is closed and then the water stop material dropping port 53 is opened. In this case, as shown in FIG. 2C, the water stop material 64 is dropped from the water stop material supply tank into the water stop material pouring member 70 through the water stop material dropping port 53. The water-stopping material 64 dropped into the water-stopping material pouring member 70 is further from the lower end of the water-stopping material pouring member, particularly in the vicinity of the end of the insulating coating 59 among the core wires 58 exposed from the insulating member 59. (In the figure, it is accurately dropped on the core wire 58 between the barrels 61 and 62). For this reason, on the core wire 58 in the vicinity of the end of the insulating coating 59, the water stop material 64 stays in a temporarily piled state, or a part of the water stop material 64 is in the vicinity of the ground terminal 55 and the core wire 58. It stays in the state which oozed out between the insulation coating 59 and also between each core wire 58.

  After the set amount of water-stopping material 64 has been dropped on the core wire 58, the water-stopping material dropping port 53 is closed as shown in FIG. 2 (d), and further dripping of the water-stopping material 64 is stopped, Subsequently, the air inlet 54 is opened as shown in FIG. As a result, the outside air (atmosphere) enters the airtight chamber 51 from the atmosphere introduction port 54 at once or by a controlled predetermined amount. For this reason, the inside of the airtight chamber 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 (sucked) into the negative pressure side in an instant or gradually at a predetermined speed.

  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, as shown in FIG. 2 (e), when the water stop material 64 reaches a predetermined amount or position, the air inlet 54 is closed so as to stop the intake into the airtight chamber 51, Leave 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 rainwater or the like between the core wire 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 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 the air supply is not forcibly supplied to the water stop material 64, there is no possibility that air bubbles are mixed in 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 disposed outside the hermetic chamber 51. In this example, it is necessary to pass through the one side wall of the hermetic chamber 51 through the electric wire 57 in the portion where the electric wire terminal sealing box 63 is provided. For this reason, the through hole provided in this side wall and the electric wire 57 penetrating through this through hole are provided. 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 chamber 51. Each operation | movement of dripping of the water stop material 64 and air introduction | transduction to the airtight chamber 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 water stop process, the wire terminal sealing box 63 that seals the harness connection terminal 56 is outside the airtight chamber 51, but the insulating 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 hermetic chamber 51. The wire terminal sealed box 63 is taken out of the hermetic chamber 51 as described above. In the airtight chamber 51, the grounding terminal 55 and the electric wire 57 are supported by support means (not shown) so as not to move or rotate substantially straight. 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 of the vehicle body, 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. In FIG. 3, the lower end of the water blocking material pouring member 70 faces just above the core wire 58 exposed from the insulating coating 59 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 disposed outside the airtight chamber 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. Further, in the vicinity of the electric wire terminal sealed box 63, the electric wire is watertightly penetrated and supported by one end of the hermetic chamber 51 through the sealing material 65.

  Next, the air in the airtight chamber 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 chamber 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 chamber 51 are stopped. By the suction of the air, the inside of the hermetic chamber 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 chamber 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. In this case, as shown in FIG.4 (c), it is dripped in the water stop material extraction member 70 through the water stop material dropping port 53 from the water stop material supply tank. The water-stopping material 64 dropped into the water-stopping material pouring member 70 is further from the lower end of the water-stopping material extraction member 70, particularly in the vicinity of the end of the insulating coating 59 among the core wires exposed from the insulating member 59 (see FIG. Then, it is accurately dropped with respect to the barrels 61 and 62). For this reason, on the core wire 58 in the vicinity of the end of the insulating coating 59, the water stop material 64 stays in a temporarily piled state, or a part of the water stop material 64 is in the vicinity of the ground terminal 55 and the core wire 58. It stays in the state which permeated between the insulation coatings 59 or between the core wires 58.

  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. Stop. Subsequently, the air inlet 54 is opened as shown in FIG. As a result, outside air (atmosphere) enters the airtight chamber 51 from the atmosphere introduction port 54 at once, or a controlled predetermined amount gradually enters. For this reason, the inside of the airtight chamber 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. Be drawn.

  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, the suction to the airtight chamber 51 is stopped, the air introduction port 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 of water leaking from the ground terminal 55 side through the insulating coating 59 to the harness connection terminal 56 side outside the hermetic chamber 51.

  Thereby, corrosion of the harness connection terminal 56 portion, 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 shutoff device for the electric wire according to the second embodiment includes an airtight chamber 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 chamber 51, and the inside and outside of the airtight chamber 51. A water stop material dropping port 53 for dropping the water stop material provided to communicate with the airtight chamber 51 and an atmosphere for introducing the air into the airtight chamber, which is also provided to communicate with the inside and outside of the airtight chamber 51. And an introduction port 54.

  Among these, the said airtight chamber 51 is comprised, for example as a molded article of a synthetic resin, and becomes the structure which can withdraw / insert the below-mentioned electric wire 57 inside. The hermetic chamber 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 thicknesses and strengths that do not cause deformation, breakage, or air leakage even when the inside of the airtight chamber 51 is depressurized to a vacuum or a pressure close to vacuum.

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

  The water stop material dropping port (water stop material dropping nozzle) 53 is configured to penetrate inside and outside of the airtight chamber 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-stopping material is supplied from the water-stopping material supply tank or the like to the water-stopping material dropping port 53 via the water-stopping material pouring member 70 using a pump or the like.

  The water-stopping material pouring member 70 has a funnel shape with an upper portion having a large diameter and a lower portion having a small diameter, and is provided so as to be positioned directly below the water-stopping material dropping port 53. The reason why the upper portion has a large diameter is to absorb a shift in the relative position between the water stop material dropping port 53 and the water stop material pouring member 70. Thereby, the liquid water-stopping material dropped from the water-stopping material dropping port 53 can be reliably received in the water-stopping material dispensing member 70. In addition, by attaching this water-stopping material pouring member 70 to the water-stopping material dropping port 53 side, the liquid water-stopping material dripped from the water-stopping material dropping port 53 is surely put into the water-stopping material pouring member 70. Can receive.

  Further, the lower end portion of the water stop material pouring member 70 has a small diameter as described above, but the tip (lower end) is on the core wire 58 exposed from the insulating coating 59 as described later, and in particular, the insulating coating 59. It is arranged at a position facing the vicinity of the end. For this reason, the electric wire 57 is positioned in the airtight chamber 51 so that the core wire 58 in the vicinity of the insulating coating 59 is located immediately below the lower end of the water blocking material extraction member 70. In addition, the water stop material pouring member 70 has a size (diameter) corresponding to the diameter of the core wire 58.

  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 the present embodiment, as will be described later, when the inside of the airtight chamber 51 changes from negative pressure to atmospheric pressure, it is necessary to infiltrate the water-stopping material dripped 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 hermetic chamber 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 airtight chamber in a reduced pressure state can be changed to atmospheric pressure. In addition, the air supply pump can control the air supply from the negative pressure to the atmospheric pressure direction at a predetermined speed in the pressure-tight airtight chamber 51.

  The electric wire 57 is housed in the hermetic chamber 51 over its entire length, and the end opposite to the side on which the grounding terminal 55 is provided is closed by a sealing material 66 made of a rubber plug cap or adhesive. Yes. Therefore, at the end of the sealed state of the electric wire, the space between the core wire 58 and the insulating coating 59 is not exposed to the outside air, and ventilation is impossible.

  Next, the water stop method by the water stop apparatus of the electric wire 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 accommodated in the airtight chamber 51. In the airtight chamber 51, the ground terminal 55 and the sealing material 66 are supported together with the electric wire 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. In FIG. 5, the lower end of the water stop material pouring member 70 faces directly above the core wire 58 exposed from the insulating coating 59 between the barrels 61 and 62.

  On the other hand, the sealing member 66 is made of the rubber plug cap or the adhesive material, which covers the vicinity of the end of the insulating coating 59 which is the other end of the electric wire 57, and does not easily fall off from the end of the insulating coating 59. The end opening is closed as well as airtightly. The sealing material 66 is housed in the airtight chamber 51 together with the other end of the insulating coating 59.

  Next, the air in the airtight chamber 51 containing the electric wire 57 having the grounding 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 chamber 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 chamber 51 are stopped. By the suction of the air, the inside of the airtight chamber 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. By this decompression step, the inside of the hermetic chamber 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. 6 (c), it is dropped into the water stop material pouring member 70 from the water stop material supply tank through the water stop material dropping port 53. The water-stopping material 64 dropped into the water-stopping material pouring member 70 is further from the lower end of the water-stopping material pouring member 70, particularly in the vicinity of the end of the insulating coating 59 among the core wires exposed from the insulating member 59 ( In FIG. 5, it is accurately dropped with respect to the barrels 61 and 62. For this reason, on the core wire 58 in the vicinity of the end of the insulating coating 59, the water stop material 64 stays in a temporarily piled state, or a part of the water stop material 64 is in the vicinity of the ground terminal 55 and the core wire 58. It stays in the state which permeated between the insulation coatings 59 or between the core wires 58.

  After the water-stopping material 64 is dropped on the core wire 58, the water-stopping material dropping port 53 is closed as shown in FIG. 6D, and further dripping of the water-stopping material 64 is stopped. The air inlet 54 is opened as shown in FIG. As a result, the outside air (atmosphere) enters the airtight chamber 51 from the atmosphere introduction port 54 at once or by a controlled predetermined amount. For this reason, the inside of the airtight chamber 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 18 exposed from the insulation coating 19 on the grounding terminal 15 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 insulation 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, the suction to the airtight chamber 51 is stopped, the air introduction port 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, rainwater or the like does not flow into various electronic components connected to the core wire exposed after the sealing material 66 is removed, and the occurrence of corrosion, insulation deterioration, 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 end portion of the electric wire 57 on the side where the sealing material 66 is attached is disposed outside the hermetic chamber 51. In this example, it is necessary to pass through the one side wall of the hermetic chamber 51 through the electric wire 57 at a portion where the sealing material 66 is provided. For this reason, the sealing material 65 is interposed between the through hole for inserting the electric wire 57 and the electric wire 57 that passes through the through hole. 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 hermetic chamber 51. Intake from the inside of the hermetic chamber 51 and dripping of the water stop material 64 onto the core wire 58. And each operation | movement of air introduction | transduction to the airtight chamber 51 is implemented sequentially similarly to 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 chamber 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 hermetic chamber 51. The other end of the electric wire 57 including the sealing material 66 is taken out of the hermetic chamber 51 as described above. In the airtight chamber 51, the electric wire 57 having the ground 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 of the vehicle body, 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 used for mounting other electronic components and the like, but in the water-stop process, outside the airtight chamber 51 as shown in the figure. 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 chamber 51 containing the electric wire 57 having the ground terminal 55 is sucked from the air suction port 52 by driving the vacuum pump using the air suction port 52. FIG. 8A shows an air suction operation in the hermetic chamber 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 chamber 51 are stopped. By the suction of the air, the inside of the hermetic chamber 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 chamber 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 as shown in FIG. 8B, and then the water stop material dropping port 53 is opened as shown in FIG. 8C. In this case, the water stop material supply tank is dropped into the water stop material pouring member 70 through the water stop material dropping port 53. The water-stopping material 64 dropped into the water-stopping material pouring member 70 is further from the lower end of the water-stopping material pouring member 70, particularly in the vicinity of the end of the insulating coating 59 among the core wires exposed from the insulating member 59 ( In the figure, it is accurately dropped with respect to the barrels 61 and 62). For this reason, on the core wire 58 in the vicinity of the end of the insulating coating 59, the water stop material 64 stays in a temporarily piled state, or a part of the water stop material 64 is in the vicinity of the ground terminal 55 and the core wire 58. It stays in the state which permeated between the insulation coatings 59 or between the core wires 58.

  After the water-stopping material 64 is dropped on the core wire 58, the water-stopping material dropping port 53 is closed as shown in FIG. 8D, and further dripping of the water-stopping material 64 is stopped. 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 chamber 51 at once or a predetermined amount. For this reason, the inside of the airtight chamber 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 chamber 51 is stopped, the air introduction port 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 chamber 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 housed in a sealed state in the airtight chamber 51, the air in the airtight chamber 51 is sucked from an air suction port 52 provided in the airtight chamber 51, and a water stop material dropping port is sucked after the air is sucked. After the water-stopping material dropped from 53 is once received by the water-stopping material pouring member (funnel), it concentrates on the designated part on the core wire 58 exposed at one end of the insulating coating 59 from the lower end of the water-stopping material pouring member. The water-stopping material 64 is dropped drastically, and after completion of the concentrated dripping of the water-stopping material 64, the atmosphere is introduced into the airtight chamber 51 from the air introduction port 54 provided in the airtight chamber 51, and the air introduction port 54 When air is introduced into the airtight chamber 51, it is dropped on the core wire 58. The water stopping material 64 has infiltrated respectively and between the core wire 58 and the insulating coating 59 between the respective core wires 58.

  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. Thus, it is possible to reliably penetrate the water-stopping material 64 without waste, and to effectively use the water-stopping material 64 and prevent bubbles from entering the water-stopping 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, that is, at a position closest to the end of the insulating coating 59, thereby entering the airtight chamber 51. The water blocking material 64 dripped onto one end of the core wire 58 at the time of introduction of the air can be efficiently permeated into the insulating coating of the electric wire 57 without diffusing to other parts.

  Furthermore, when the core wire 58 exposed from the other end of the insulation 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, The end and the core wire 58 exposed from the other end can be sealed by the electric wire end sealing box 63, and the harness connection terminal 56 is attached to suck the air in the insulating coating 59 and enter the water stop material 64. It can be carried out reliably.

  When the other end of the insulating coating 59 is covered with the sealing material 66 together with the end of the core wire 58 exposed from the other end of the insulating coating 59, the other end of the insulating coating 59 of the electric wire 57 and the other end are exposed. The core wire 58 can be completely sealed by the sealing material 66, and the suction of 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. it can.

REFERENCE SIGNS LIST 51 Airtight chamber 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 Water-stopping material 65 Sealing material 66 Sealing material 70 Water-stopping material pouring member (funnel)

Claims (2)

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,
Of 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 the one end side where the core wire is exposed is stored in an airtight chamber in a sealed state. Wire storage step;
An air suction step for sucking air in the airtight chamber from an air suction port provided in the airtight chamber;
After the water-stopping material dropped from the water-stopping material dropping port provided in the airtight chamber after the air is sucked into the water-stopping material pouring member, the insulating coating is applied from the lower end of the water-stopping material pouring member. A water-stopping material dripping step for dripping intensively at a designated site on the core wire exposed at one end of the core,
An air introduction step for introducing air into the airtight chamber from an air inlet provided in the airtight chamber;
Have
When the air is introduced into the airtight chamber 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. Water stop method. A water stop device for an electric wire that allows a water stop material to penetrate between a plurality of core wires wrapped in an insulation coating,
An airtight chamber for accommodating in a sealed state at least one insulating coating on one end side where the core wire is exposed 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. ,
An air suction port provided in the hermetic chamber for sucking air in the hermetic chamber;
A water-stop material dropping port provided in the hermetic chamber for dripping the water-stop material intensively onto a designated portion on the core wire exposed at one end of the insulating coating using a water-stop material pouring member;
An air inlet provided in the airtight chamber, for introducing air into the airtight chamber;
With
When the atmosphere is introduced from the atmosphere introduction port into the airtight chamber that has been brought to a vacuum or a state close to a vacuum by the air suction, the water-stopping material dropped on the core wire is between the core wire and the insulation coating, And a water stopping device for an electric wire, which penetrates between the core wires.

Images