JP4996205B2 - Method for water stop treatment of electric wires - Google Patents

Description

  The present invention relates to a technique for applying a water stop treatment to an electric wire.

  In a vehicle or the like, a plurality of electric wires connected to an electric circuit or the like may be wired while being electrically connected to each other. As a method of connecting the electric wires, after removing the covering material at the end of each electric wire and exposing the conductor, a method of connecting the exposed conductors or a covering material in the middle of a specific electric wire There is a method of removing and connecting the conductor of the terminal of another electric wire to the covering material removal portion. However, in any method, it is necessary to remove the covering material to expose the conductor, so that moisture enters the electric wire from the boundary portion between the area where the covering material is removed and the area where the covering material is not removed. There is a fear. And when the said water | moisture content penetrate | invades into the said electric circuit etc. along the inner side of a coating | covering material, there exists a possibility of preventing the normal operation | movement of the said circuit.

  Therefore, in the case where such a plurality of electric wires are electrically connected, a method for performing a water stop treatment on the connected wires has been developed. For example, in Patent Document 1, after welding the conductors of the electric wires and electrically connecting the electric wires, the connection portion is housed in a heat shrinkable tube and a waterstop agent is stored in the heat shrinkable tube. A method is disclosed in which a water-stopping agent is heat-cured and the heat-shrinkable tube is heat-shrinked.

According to this method, since the connection portion of the electric wire is covered with the heat-shrinkable tube, water can be prevented from entering the connection portion, and the connection portion can be protected from external force.
JP 2006-81319 A

  However, in the method in which the connection portion between the conductors is accommodated in the heat shrinkable tube as described above and the waterstop agent is stored in the heat shrinkable tube, the entire region in which the waterstopper is stored is the heat shrinkable tube. Must be covered. Therefore, when water stop treatment is performed over a wide range in order to reliably suppress water intrusion into the electric wire, the water stop region becomes bulky and wiring work becomes difficult.

  In view of such circumstances, an object of the present invention is to reliably perform a water stop treatment of an electric wire with a simple operation without causing the connecting portion of the electric wire to be bulky.

  In order to solve the above-mentioned problems, the present invention is a method for electrically connecting conductors of a plurality of electric wires having a coating material on the outside of a conductor and performing a water stop treatment on at least some of the electric wires. A conductor exposing step of exposing the conductor by removing the covering material of each of the plurality of wires, and after the conductor exposing step, connecting the conductors using a wire terminal to electrically connect the plurality of wires. A wire connecting step for connecting to the water, a water-stopping agent penetration step for penetrating the water-stopping agent into the covering material of at least some of the wires after the wire connecting step, and the water-stopping agent penetration A tape winding step of winding a tape around the electric wire after the step, and in the electric wire connecting step, an electric wire having a conductor barrel portion that is crimped to the conductor in a posture of embedding the conductor from the outside as the electric wire terminal Using the terminal for The bundle of conductors and the conductor barrel portion are pressure-bonded while bundling the exposed plurality of conductors by the conductor barrel portion, and the covering of at least some of the plurality of wires is performed in the waterproofing agent penetration step. An electric wire placing step of placing a boundary portion between a region where the material is removed and a region where the material is not removed on the tape, and a water-stopping agent having fluidity at the boundary portion placed on the tape. A water-stopping agent supply step in which the water-stopping agent closes a gap between the conductor of the electric wire and the covering from the outside, an ambient pressure of a portion where the water-stopping agent is dropped, and the water-stopping agent A differential pressure infiltration step of causing a pressure difference with the pressure inside the coating material of the electric wire on which the water has been dropped, and causing the water-stopping agent to penetrate inside the coating material due to the pressure difference, In the tape winding process, the electric wires placed on the tape Wrapping the tape at least in the boundary portion Chi provide waterproofing method of processing wire according to claim (Claim 1).

  According to this method, after exposing the conductor of each electric wire in the conductor exposing step, the bundle of conductors and the conductor barrel portion are bundled with the exposed plurality of conductors by the conductor barrel portion of the electric wire terminal in the electric wire connecting step. Can be connected to each other easily and without being bulky. In the water-stopping agent penetration step, a boundary portion between the region where the wire covering material is removed and the region where the wire covering material is not removed in the wire-mounting step is placed on the tape. Since the water-stopping agent is dripped at the boundary portion placed on the tape and the dripping water-stopping agent is received by the tape, it is possible to suppress the water-stopping agent from adhering to a work table or the like other than the tape. it can. Furthermore, the water stop agent can be held in a stable state by this tape, and the gap between the conductor of the electric wire and the covering material can be reliably closed from the outside by the water stop agent. In the differential pressure infiltration step in the water stop agent permeation step, the water stop agent is easily produced by creating a pressure difference between the ambient pressure of the portion where the water stop agent is dropped and the pressure inside the coating material. Can penetrate into the inside of the covering material over a wide range, so that the gap between the conductor and the covering material can be surely filled with a water-stopping agent, and the electric wire can be stopped without increasing its volume. be able to. Moreover, in the tape winding process, since the tape is wound around the boundary portion placed on the tape, the portion covered with the water-stopping agent can be protected by the tape. Furthermore, if the tape to which the water-stopping agent is attached is wound around the boundary portion in the water-stopping agent supplying step, the water-stopping agent does not remain on the work table around the electric wire. It is no longer necessary to wash off the water-stopping agent adhering to the etc. Therefore, it is possible to protect the water stop location while improving the efficiency of the water stop treatment.

  Further, in the electric wire placing step, a standing wall portion is formed by the tape so as to stand up so as to surround at least the boundary portion where the water-stopping agent is dropped from both sides in the width direction of the electric wire, and the boundary portion is defined as the standing wall portion. It is preferable to place it on the part surrounded by (Claim 2).

  In this configuration, in the electric wire placing step, the boundary portion where the water stopping agent is dropped is placed in a portion surrounded by the standing wall portion formed by the tape, and in the water stopping agent supplying step, the standing wall Since the water-stopping agent is dripped at the boundary part surrounded by the part, it is possible to more reliably suppress the water-stopping agent from scattering or leaking around the tape, and more It can supply to the said boundary part efficiently and can improve the efficiency of a water stop process more.

  As described above, according to the present invention, it is possible to perform the water stop treatment of the electric wire efficiently and with a simple operation without increasing the volume of the connecting portion of the electric wire.

  A preferred embodiment of the present invention will be described with reference to the drawings. Here, the case where the terminal 10a of the 1st electric wire 10 and the terminal 50a of the 2nd electric wire 50 are connected and the water stop process is performed to the terminal 10a of the 1st electric wire 10 is demonstrated.

  As the electric wires 10 and 50, the conductors 12 and 52 and the covering materials 14 and 54 arranged around the conductors 12 and 52 are used, and the covering materials 14 and 54 are made of an electric insulating material.

  The water-stopping method for electric wires according to this embodiment includes the following steps.

1) Conductor exposure step In this step, as shown in FIG. 1, the covering materials 14 and 54 of the terminals 10 a and 50 a of the first electric wire 10 and the second electric wire 50 are removed by a predetermined length, and each conductor 12 , 52 are exposed.

2) Electric wire connecting step In this step, as shown in FIG. 2, the electric wire terminal 20 is fixed by crimping to the exposed conductors 12 and 52, and the first electric wire 10 and the second electric wire 50 are connected. This is an electrical connection process.

  The electric wire terminal 20 in the illustrated example is formed by bending a single metal plate, and includes a substrate 21 extending in the length direction of the electric wire, and extending upward from a side portion of the substrate 21. A conductor barrel portion 22 that is crimped to the conductors 12 and 52 while the conductors 12 and 52 of the electric wires 10 and 50 are bundled.

  In order to perform this electric wire connection step, first, as shown in FIG. 1, both electric wires 10 and 50 are set in the electric wire terminal 20 with the conductor barrel portion 22 of the electric wire terminal 20 being opened. Here, the conductors 12 and 52 exposed in the conductor exposing step are disposed on the conductor barrel portion 22 so as to contact each other. Then, as shown in FIG. 2, the conductor barrel portion 22 is bent and deformed in the closing direction, and the two conductors 12 and 52 are crimped and fixed while being bundled in an attitude of embedding from the outside. Thereby, both the conductors 12 and 52 are connected, and the electric wire 10 and the electric wire 50 are electrically connected to each other.

3) Water-stopping agent penetration step This step is a step of allowing the water-stopping agent 18 to penetrate inside the covering material 14 of the first electric wire 10. This step further includes the following steps.

3-1) Electric Wire Placement Step This step is a step of placing the boundary portion A between the area where the covering material 14 of the first electric wire 10 is removed and the area where the covering material 14 is not removed is placed on the tape 60.

  In this step, as shown in FIG. 3, the tape 60 is placed on the work table 70, and the boundary portion A of the first electric wire 10 is placed on the tape 60. Here, a part from each of the electric wires 10 and 50 connected to each other by the electric wire terminal 20 to a portion covered with the covering materials 14 and 54 is placed on the tape. Here, as shown in FIG. 4, the tape 60 is installed so as to form a standing wall portion 60 a that rises so as to surround the electric wires 10 and 50 placed above from both sides in the width direction. That is, the boundary portion A of the first electric wire 10 is placed on the tape 60 so as to be surrounded by the standing wall portion 60a.

  The tape 60 is a tape having an inner surface coated with an adhesive, and for example, a tape made of vinyl chloride or the like can be used.

3-2) Water-stopping agent supply step This step is a step of supplying the water-stopping agent 18 to the first electric wire 10 placed on the tape 60. Specifically, as shown in FIG. 5, water is stopped using a dispenser (not shown) for a boundary portion A between the area where the covering material 14 is removed and the area where the covering material 14 is not removed in the first electric wire 10. The agent 18 is dropped, so that the water-stopping agent 18 closes the gap between the conductor 12 and the covering material 14.

  Here, as shown in FIG. 6, since the tape 60 is disposed below the boundary portion A, the water-stopping agent 18 accumulates in the boundary portion A in a more stable state. Further, in the water-stopping agent supply step, the water-stopping agent 18 leaks and scatters below and around the boundary portion A when dropped, and the tape 60 is installed below the boundary portion A as described above. Therefore, most of the water-stopping agent 18 leaked or scattered adheres to the tape 60. In particular, the standing wall portion 60a formed on the left and right sides of the boundary portion A effectively suppresses the leakage of the water blocking agent 18 to the outside of the tape 60. Adhesion is suppressed. .

  The dropping of the water-stopping agent 18 may be completed once, but when the differential pressure infiltration process described later is started, the water-stopping agent 18 supplied first penetrates into the inside of the covering material 14. Since the amount of the water-stopping agent 18 collected on the tape 60 gradually decreases, the water-stopping agent 18 is additionally dropped in parallel with the differential pressure infiltration step so as to replenish the amount. Also good. Thereby, it becomes possible to reliably fill the gap between the conductor 12 and the coating material 14 with a sufficient amount of the water-stopping agent 18 evenly.

  As the water-stopping agent 18, one having fluidity in the initial state is used. This fluidity is such that the water-stopping agent 18 can penetrate into the covering material 14 due to the pressure difference between the pressure around the water-stopping agent 18 and the pressure inside the covering material 14 in the differential pressure infiltration step described later. If it is a thing. In general, if the viscosity of the water-stopping agent 18 is about 0.006 to 6 Pa · s in the initial state, the water-stopping agent 18 can be infiltrated into the covering material 14 by a differential pressure infiltration step described later. Has been confirmed.

  Further, the water-stopping agent 18 preferably has a viscosity that increases (that is, cures) to such an extent that at least the form of the water-stopping agent 18 is stably maintained after the permeation. This curing may be natural curing, or curing accelerated by ultraviolet irradiation or heating. However, it is preferable that a certain degree of elasticity (flexibility) is ensured in the water-stopper 18 even after the curing. Thereby, it is avoided that the waterproofing agent 18 is cracked or damaged when an external force is applied in the vicinity of the boundary portion A during wiring.

  Specifically, as the material of the water-stopping agent 18, for example, a silicone resin having natural curing characteristics or photocuring characteristics is suitable. The ultraviolet curable silicone resin generally contains a polyfunctional silicone oligomer as a main component containing a photopolymerization initiator (for example, a benzophenone-based, benzoin-based, acetophenone-based compound, etc.) When irradiated, the photopolymerization initiator is excited to generate radicals for polymerizing the silicone oligomer. In order to give the silicone resin a natural curing property, for example, a curing catalyst that accelerates a curing reaction in the presence of moisture in the air may be further included in the silicone oligomer.

  In addition, examples of the material of the water blocking agent 18 include polyfunctional monomers and oligomers such as epoxy resin, polyurethane, polyester, and polybutadiene acrylate.

3-3) Differential pressure infiltration process This process generates a pressure difference between the ambient pressure of the boundary portion A and the pressure inside the covering material 14 of the first electric wire 10, and is stopped by this pressure difference. This is a step of allowing the liquid medicine 18 to permeate the inside of the covering material 14. Specifically, it is a terminal of the first electric wire 10, and the air inside the covering material 14 of the first electric wire 10 is sucked from the terminal 10 b on the side opposite to the boundary portion A to decompress the inside thereof. Thus, the pressure difference is generated. This step may be after the water-stop agent supply step or may be performed in parallel with the water-stop agent supply step.

  As shown in FIG. 7, in this step, the terminal 10 b of the first electric wire 10 to which the water blocking agent 18 is dropped is connected to the decompression container 30, and the decompression container 30 is connected via the hose 40 and the pressure control panel 42. By connecting to the suction port of the suction pump 44, the air inside the covering material 14 of the first electric wire 10 is sucked.

  The decompression container 30 is provided with a rubber plug mounting hole 32 penetrating in the thickness direction, and the rubber plug 36 is fitted in the rubber plug mounting hole 32. A through hole 36a is provided substantially at the center of the rubber plug 36. By pressing the terminal 10b of the first electric wire 10 into the through hole 36a, the inner peripheral surface of the rubber plug 36 and the first electric wire 10 are provided. The outer peripheral surface is closely attached and sealed. Thereby, the inside of the decompression container 30 becomes a sealed space, and the inside of the sealed space is depressurized by the operation of the suction pump 44 under the control of the pressure control panel 42 until a constant negative pressure is reached. The inner space of the covering material 14 can be decompressed.

  Here, if the boundary portion A of the first electric wire 10 is left under atmospheric pressure, a pressure difference is generated between the boundary portion A and the covering material 14. Penetrates into the inside of the covering material 14. Further, according to this method, the water stop agent 18 can be infiltrated into the inside of the covering material 14 in a stable state while effectively preventing air from being caught in the water stop agent 18. It is possible to reliably fill the gap between the material 14 and the water-stopping agent without unevenness.

4) Tape winding process This process is a process of winding the tape 60 as it is around at least the boundary portion A in the first electric wire 10 to which the water-stopping agent is dropped, as shown in FIG.

  Specifically, the tape 60 disposed below the electric wires 10, 50 is connected to the first electric wire 10, the second electric wire 50, and both electric wires 10, 50 placed on the tape 60. Wind around the wire terminal 20. Since the adhesive material is applied to the inner surface of the tape 60 as described above, the tape 60 is bonded around the electric wires 10 and 50 by being wound. Here, as described above, the water-stopping agent 18 is attached to the tape 60 in the water-stopping agent supply step. By winding the tape 60 around the electric wires 10 and 50 or the like as it is, the water-stopping agent is applied. 18 cleaning operations are not required.

  In this way, the first electric wire 10 and the second electric wire 50 are electrically connected, and the first electric wire 10 is subjected to water stop treatment. In this water-stop treatment method, most of the water-stopping agent 18 that leaks or scatters around the wire when dropped is attached to the tape 60, and the tape 60 to which the water-stopping agent 18 is attached is also attached to the wires 10 and 50. Since it is wound around, the water stop agent 18 does not remain on the work table 70 or the like. Therefore, the next water stop treatment can be started immediately without cleaning the work table 70 and the like.

  According to the water stopping method as described above, first, the covering materials 14 and 54 of the terminals 10a and 50a of the first electric wire 10 and the second electric wire 50 are removed in the conductor exposing step, and exposed in the electric wire connecting step. The electric wires 12 and 52 can be electrically connected by a simple method of connecting the conductors 12 and 52 by the electric wire terminal 20, and an increase in the volume of the electric wire connecting portion can be suppressed. . In the water-stopper penetration step, the boundary portion A between the region where the covering material 14 of the first electric wire 10 is removed and the region where the coating material 14 is not removed is placed on the tape 60 in the wire placement step, Since the water-stopping agent 18 is dripped onto the boundary portion A placed on the tape 60 in the liquid supply step, it is possible to suppress the water-stopping agent 18 from adhering to the work table 70 and the like. The liquid agent 18 can be held in a stable state, and the gap between the conductor 12 of the first electric wire 10 and the covering material 14 can be reliably closed from the outside by the water stop agent 18. Next, in the differential pressure osmosis step, a pressure difference is generated between the ambient pressure of the portion where the water-stopping agent 18 is dropped and the pressure inside the coating material 14, whereby the water-stopping agent 18 is removed from the coating material 14. It can easily penetrate inside. And since this tape 60 is wound around the said boundary part A mounted on the tape 60 in the last tape winding process, while the part covered with the water-stopping agent 18 can be protected with this tape 60, By winding the tape 60 to which the water-stopping agent 18 is attached, the trouble of cleaning the water-stopping agent 18 can be saved, and the efficiency of the water-stopping treatment can be improved.

  Moreover, like the said embodiment, the standing wall part 60a which stands | starts up so that the said boundary part A may be enclosed is formed in the width direction both sides of the 1st electric wire 10 with the tape 60 by an electric wire mounting process, and this standing wall part 60a If the boundary portion A is placed on the surrounded portion, scattering and leakage of the water stopping agent 18 to the work table 70 and the like can be suppressed, and the water stopping agent 18 is efficiently supplied to the boundary portion A. Therefore, the efficiency of the water stop treatment can be further improved.

  And in the water stop structure of the electric wire subjected to the water stop treatment by such a water stop treatment method, the water stop agent 18 penetrates in the length direction of the electric wire from the gap between the conductor 12 and the covering material 14. Since the water stop of one electric wire 10 is performed, an increase in the volume of the water stop portion is suppressed, and an electric wire that has been subjected to water stop treatment over a wide range can be realized. In addition, the tape 60 is wound around the boundary portion A, the bending deformation of this portion can be suppressed, the durability of the electric wire can be improved, and the water stop portion can be damaged due to external influences. It can suppress receiving and can secure a water stop effect.

  Here, in the said embodiment, although shown about the case where each terminal of the two electric wires 10 and 50 was connected, this invention does not limit the number of the electric wires to connect and the electric wire which performs a water stop process, This is also effective when three or more wires are connected and when two or more wires are water-stopped.

  In the above embodiment, as a method of generating a pressure difference in the differential pressure infiltration step, a case where a method of sucking air inside the covering material 14 and depressurizing the inside is shown, but the boundary portion A May be put in a pressurized container and a pressure difference may be generated by pressurizing the boundary portion A. In this case, if the terminal 10b of the first electric wire 10 is left under atmospheric pressure, the pressure difference can be easily obtained.

  Further, the tape 60 is not limited to the above as long as it can be wound around the electric wires 10 and 50 and can be fixed in the wound state.

  Moreover, in the said embodiment, as shown in FIG.4, 6, etc., the tape 60 of predetermined length is mounted on the work table 70, and all this mounted tape 60 is wound around the electric wires 10, 50, etc. Although shown about the case where it attached, after winding around the electric wires 10 and 50 etc., or just before winding, you may make it cut the tape 60 to predetermined length.

  Moreover, it is not limited to the case where the ends of the electric wires are connected as described above, but may be used when the conductor is exposed by removing the covering material in the middle of the electric wires, and another electric wire is connected to this conductor portion. .

It is a top view which shows the state which set the two electric wires concerning embodiment of this invention to the terminal for electric wires. It is a top view which shows the state which crimped-fixed two electric wires concerning embodiment of this invention. It is a top view which shows the state which mounted the two electric wire and tape concerning embodiment of this invention on the worktable. FIG. 4 is a cross-sectional view of FIG. 3. It is a top view which shows the state by which the water stop agent was dripped at the electric wire concerning embodiment of this invention. It is sectional drawing of FIG. It is a figure which shows the example of the apparatus for decompressing the terminal of the electric wire by which the water stop agent was dripped among the said electric wires. It is a top view which shows the electric wire in which the water stop processing method concerning embodiment of this invention was given.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st electric wire 12 Conductor 14 Coating | covering material 18 Water stop agent 20 Electric wire terminal 21 Board | substrate 22 Conductor barrel part 30 Depressurization container 50 Second electric wire 52 Conductor 54 Coating | covering material 60 Tape 70 Worktable A Boundary part

Claims (2)

A method for electrically connecting conductors of a plurality of electric wires having a coating material on the outside of a conductor, and performing a water stop treatment on at least some of the electric wires,
A conductor exposing step of exposing the conductor by removing the covering materials of the plurality of electric wires, respectively;
After the conductor exposing step, a wire connecting step of connecting the conductors using a wire terminal to electrically connect the plurality of wires,
After the electric wire connecting step, a water stopping agent permeating step for infiltrating the water stopping agent into the inside of the covering material of at least some of the electric wires, and
Including a tape winding step of winding a tape around the electric wire after the water-stopper penetration step,
In the electric wire connection step, the exposed plurality of conductors by the conductor barrel portion using the electric wire terminal having a conductor barrel portion that is crimped to the conductor in a posture of embedding the conductor from the outside as the electric wire terminal. The conductor bundle and the conductor barrel part are crimped while bundling,
In the water blocking agent permeating step, the electric wire placement for placing on the tape a boundary portion between the region where the covering material of at least some of the plurality of electric wires is removed and the region where the covering material is not removed. A water-stopping agent that drops a fluidity-stopping agent onto the boundary portion placed on the tape and the step of sealing the gap between the conductor of the wire and the covering material from the outside A pressure difference is generated between the supply stroke, the ambient pressure of the portion where the water-stopping agent is dropped, and the pressure inside the coating material of the electric wire where the water-stopping agent is dropped. A differential pressure infiltration step for infiltrating a water-stopping agent into the inside of the covering material,
In the tape winding step, the water-stopping method for an electric wire, wherein the tape is wound around at least the boundary portion of the electric wires placed on the tape. In the water stop processing method according to claim 1,
In the electric wire placing step, the tape forms a standing wall portion that rises so as to surround at least the boundary portion where the water blocking agent is dropped from both sides in the width direction of the electric wire, and surrounds the boundary portion with the standing wall portion. The water stop processing method of the electric wire characterized by mounting in the part to be covered.

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