JP5465494B2 - Water-stop treatment structure for the connection of water-resistant insulated wires - Google Patents

Description

  The present invention relates to a water stop treatment structure for a connection portion of a water-resistant insulated wire suitable for use in a connection portion between a water-resistant insulated wire and a power cable, or a connection portion between water-resistant insulated wires.

  2. Description of the Related Art Conventionally, a liquid ring type submerged motor is configured by enclosing a sealing liquid in a frame that houses a stator and a rotor. And the power cable inserted from the exterior of a flame | frame is connected in the flame resistant insulation electric wire which comprises a coil wire in the flame | frame.

  FIG. 9 is a schematic cross-sectional view showing a connection portion between a water-resistant insulated electric wire 120 and a power cable 110 housed in the conventional liquid-sealed submerged motor 100 of this type, and FIG. It is an expansion schematic sectional drawing which expands and shows the internal structure of the connection part a of the wire core 110a and the water-resistant insulated wire 120 of this. As shown in FIG. 9, the power cable 110 housed in the frame 111 of the liquid ring type submerged motor 100 is configured by covering three wire cores 110 a with a power cable sheath 113. The tip of the wire core 110a is connected to the water-resistant insulated wire 120 at each connection portion a, and the outer periphery of these three sets of connection portions a is covered with a molding portion 129 for water stop treatment.

  More specifically, the conductor portion protruding from the tip of the wire core 110a of the power cable 110 and the conductor portion protruding from the tip of the plurality of water-resistant insulated wires 120 are fixed with solder 136, and the outer periphery thereof is insulated tape 130. In addition, the water-resistant insulated wire 120 is covered with a heat-shrinkable tube 131 and insulated, and the water-resistant insulated wire 120 has a structure in which polyvinyl chloride 133, which is a material that can be bonded to the outer layer material of the insulation coating, is coated with an adhesive 134 (see FIG. 9 is applied to the surface of the power cable sheath 113, and a rubber paste is applied to the surface of the power cable sheath 113 to form an unvulcanized rubber (molded portion 129) of the same chloroprene rubber as the material of the power cable sheath 113. ) Is wound from the end of the power cable sheath 113 to the portion where the adhesive 134 of the water-resistant insulated wire 120 is applied and heat vulcanized to form a single piece. .

  Here, the water stop at both ends of the molded portion 129 can be bonded with a rubber paste on the power cable 110 side because the same chloroprene rubber as the material of the power cable sheath 113 is used as the molded material 129, while the water resistant insulated wire 120 is used. Since the side can be bonded by applying an adhesive 134 to the surface of the polyvinyl chloride 133 and winding an unvulcanized chloroprene rubber, the water can be reliably stopped at both ends.

  However, the polyvinyl chloride 133 contains lead as a stabilizer.

  On the other hand, when outer layer material for insulation coating of water-resistant insulated wires is selected for the purpose of reducing environmental impact, polyethylene and cross-linked polyethylene can be mentioned, but polyethylene and cross-linked polyethylene are difficult-to-adhere materials, and chloroprene rubber is bonded directly with an adhesive. It is impossible to do. That is, the water stop structure by the adhesive material which winds up the conventional chloroprene rubber and integrally molds does not function.

  In addition, as shown in FIG. 11, a water-resistant insulated wire using polyamide, which is a difficult-to-adhere material, as an outer layer, can be stopped by winding an adhesive tape 130 on the outer layer. However, when water is stopped by the adhesive force of the adhesive tape 130, it is necessary to increase the winding distance of the adhesive tape 130. In addition, in order to fit the connecting portion in the limited space of the cylindrical shape called the frame 111, it is necessary to wind the adhesive tape 130 by curving in advance. However, in this method, care must be taken not to generate wrinkles when the adhesive tape 130 is wound. Therefore, skilled workers are required for the construction work.

  The present invention has been made in view of the above points, and its purpose is to change the outer layer material of the insulation coating of the water-resistant insulated wire to polyethylene or cross-linked polyethylene which is a difficult-to-adhere material. This is the same for polyethylene, which does not have a separate outer layer and has a single insulation coating (a structure that also serves as an outer layer). The connection between this water-resistant insulated wire and a power cable or other water-resistant insulated wire can be easily Another object of the present invention is to provide a water stop treatment structure for a connection portion of a water-resistant insulated wire that can reliably stop water.

  The present invention utilizes the property that polyethylene or crosslinked polyethylene and uncrosslinked EPR (ethylene propylene rubber) or unvulcanized or non-vulcanized EPDM (ethylene propylene diene rubber) are fused when heated. is there. That is, the invention according to claim 1 of the present application connects a water-resistant insulated wire in which a coil wire surface is covered with an insulating coating material and a power cable inserted from the outside of the liquid ring motor in a liquid ring motor. In the water-stop treatment structure of the connection portion of the water-resistant insulated wire that waterproofs the connection portion, the outer layer material of the insulation coating is made of polyethylene or crosslinked polyethylene, and the surface of the outer layer material of the insulation coating is uncrosslinked EPR Alternatively, unvulcanized or non-vulcanized EPDM is directly wound, and further, an adhesive for vulcanization is applied to the outer peripheral surface, and unvulcanized chloroprene rubber is wound on the surface, followed by heat vulcanization, and integrally molded. The outer layer material of the insulation coating of the water-resistant insulated wire and the uncrosslinked EPR or unvulcanized or non-vulcanized EPDM are simultaneously fused, and at the same time, the uncrosslinked EPR or unvulcanized or unvulcanized system EP And allowed to bond the M and chloroprene rubber in water stop processing structure of the connecting portion of the waterproof insulated wire, characterized in that the water stop.

The invention according to claim 2 of the present application is the water-stopping treatment structure for the connection portion of the water-resistant insulated wire according to claim 1, wherein the connection portion is an insulating coating material end of the water-resistant insulated wire and the power source made of chloroprene rubber. located centrally between the cable sheath end, wherein the unvulcanized chloroprene rubber is integrally molded by hot vulcanization wound to the end of the insulating covering material or al the power cable sheath before Symbol water insulated wire , whereby in water stop processing structure of the connecting portion of the waterproof insulated wire, characterized in that bonding between the power cable sheath and the chloroprene rubber.

  The invention according to claim 3 of the present invention is an uncrosslinked EPR or unvulcanized or non-vulcanized EPDM around a portion where water-resistant insulated wires using polyethylene or crosslinked polyethylene as an outer coating material for insulation coating are connected to each other. Insulation treatment is performed by directly wrapping the outer peripheral material of the water-resistant insulated wire and the outer layer material of the insulation coating of the water-resistant insulated wire and the uncrosslinked EPR or unvulcanized or The non-vulcanized EPDM and the non-crosslinked EPR or the unvulcanized or non-vulcanized EPDM and the polyethylene heat-shrinkable tube are fused and water-stopped at the same time. It is in the water stop treatment structure of the connection part of the water resistant insulated wire.

  The invention according to claim 4 of the present invention is an uncrosslinked EPR or unvulcanized or non-vulcanized EPDM around a portion where water-resistant insulated wires using polyethylene or crosslinked polyethylene as an outer coating material for insulation coating are connected to each other. Insulation coating of the above water-resistant insulated wire by applying an insulating treatment by directly winding the wire, applying a vulcanizing adhesive on the outer peripheral surface, wrapping the unvulcanized chloroprene rubber on the surface and heat vulcanizing At the same time, the non-crosslinked EPR or unvulcanized or non-vulcanized EPDM is fused, and the uncrosslinked EPR or unvulcanized or non-vulcanized EPDM and chloroprene rubber are bonded together. The water-stopping structure of the connection portion of the water-resistant insulated wire is characterized in that the water is stopped.

  According to invention of Claim 1, even if the outer-layer material of the insulation coating of the water-resistant insulated wire used for a liquid-sealed motor is made of polyethylene or cross-linked polyethylene, the connection portion between the water-resistant insulated wire and the power cable is provided. Can be easily water-stopped. Moreover, since the final form is comprised by shape | molding chloroprene rubber, it can be easily made into the shape according to the space in a liquid ring motor, and can be easily accommodated in a liquid ring motor. In addition, since the water-stopping treatment that greatly affects the life of the liquid ring motor can be reliably performed by fusion or adhesion, the life can be extended and the effect is economical.

  According to the second aspect of the present invention, the water stop treatment can be easily performed on both sides of the connection portion between the water-resistant insulated electric wire and the power cable.

  According to invention of Claim 3, even if the outer-layer material of the insulation coating of a water-resistant insulated wire is a product made from polyethylene or a crosslinked polyethylene, the water stop process of the connection part of these water-resistant insulated wires can be carried out easily.

  According to invention of Claim 4, even if the outer-layer material of the insulation coating of a water-resistant insulated wire is a product made from polyethylene or a crosslinked polyethylene, the water stop process can be easily performed for the connection part of these water-resistant insulated wires.

It is a water stop processing structure figure of connection part A-1 of a power cable and a water-proof insulated wire. It is an expansion schematic sectional drawing of connection part A-1. 1 is an overall schematic cross-sectional view showing an example of a liquid ring motor 200. FIG. It is a water stop processing structure figure of connection part A-2 of a power cable and a water-proof insulated wire. It is a water-stopping process structural diagram of the connection part A-3 of a power cable and a water-resistant insulated wire. It is an expansion schematic sectional drawing of connection part A-3. It is a water-stop treatment structure sectional view of connection part A-4 of water-proof insulated wires. It is a water-stop treatment structure sectional view of connection part A-5 of water-proof insulated wires. It is a water-stop process structure figure of the connection part of the conventional power cable and a water-resistant insulated wire. It is an expansion schematic sectional drawing of the connection part of the conventional power cable and a water-resistant insulated wire. It is a water-stop process structure figure of the connection part of other conventional power cables and water-proof insulated wires.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 3 is an overall schematic sectional view showing an example of a liquid ring motor 200 to which the present invention is applied. As shown in the figure, this liquid ring motor 200 has a stator core 212 mounted in a cylindrical frame 211, and a main shaft 214 having a rotor 213 fixed in the center of the stator core 212 is rotatably inserted. It is configured. In addition, a sealing liquid 218 such as water or oil is sealed inside the motor of this type, and further, the inner and outer pressures are adjusted and the thermal expansion of the sealing liquid 218 during motor operation is absorbed on the anti-load side of the frame 211. A pressure adjusting mechanism including a diaphragm 219 is provided.

  A coil 220 is attached to the stator core 212. 221 and 222 are load-side and anti-load-side frame side plates, 223 and 224 are load-side and anti-load-side brackets, 215 and 216 are radial bearings, 217 is a thrust bearing, 225 is a bearing case, and 226 is The shaft seal device, 227 and 228 are bolts, and 10 is a power cable.

  The water-resistant insulated wire constituting the coil 220 and the power cable 10 inserted into the frame 211 from the outside of the liquid ring motor 200 are electrically connected in the vicinity of the AA cross section shown in FIG. The water stop process which concerns on this invention is given to this connection part.

[First Embodiment]
FIG. 1 is a water-stop treatment structure diagram of a connection portion A-1 between a power cable and a water-resistant insulated wire according to the first embodiment of the present application, and shows a portion taken along the line AA shown in FIG. FIG. 2 is an enlarged schematic cross-sectional view of one connecting portion A-1 in FIG. As shown in these figures, the power cable 10 is configured by covering three wire cores 10a, 10b, and 10c with a power cable sheath 10d. As a material for the power cable sheath 10d, chloroprene rubber is used. Two power cables 10 are introduced into the frame 211, but one of them is shown by a dotted line in FIG. 1 and its detailed description is omitted.

  The water-resistant insulated electric wire 20 connected to each of the wire cores 10a, 10b, and 10c is configured by covering the coil wire surface with an insulating coating material and an outer layer material. In this embodiment, polyethylene or Cross-linked polyethylene is used as an outer layer material for insulation coating.

  The power cable 10 is cut with a step in the longitudinal direction so that the ends of the wire cores 10a, 10b, 10c are not adjacent to each other, and the tip of the water-resistant insulated wire 20 is the length of each wire core 10a, 10b, 10c of the power cable 10. In accordance with this, the conductor portions that are cut with a level difference and protrude from the tips of both are fixed with solder (solder portion 36) and electrically connected to constitute a connection portion A-1. An insulating tape 30 is wound around (surrounds) the connection portion A-1, and a heat shrinkable tube 31 is attached around the insulation tape 30, thereby insulating the connection portion A-1. Has been processed. Further, uncrosslinked EPR or unvulcanized or unvulcanized EPDM 32 is wound around almost the entire range of each water-resistant insulated wire 20 molded by the chloroprene rubber 29 described below, and this uncrosslinked EPR or A vulcanizing adhesive 35 (shown by a number of points) is applied to the surface of unvulcanized or non-vulcanized EPDM 32. On the other hand, a rubber paste is applied to the surface of the power cable sheath 10d (the portion molded by the chloroprene rubber 29 described below). And from the surface coated with the vulcanizing adhesive 35 on the uncrosslinked EPR or unvulcanized or non-vulcanized EPDM 32 to the surface coated with the rubber glue at the end of the power cable sheath 10d, in other words, the connection The part A-1 is arranged in the center, the unvulcanized rubber of the chloroprene rubber 29 is wound from the end of the power cable sheath 10d on both sides of the part A-1 to the insulation covering material of the water-resistant insulated wire 20, and molded into a final shape. If set to 1 and heat vulcanized (heat vulcanized), the water stop structure of this embodiment is completed.

  As described above, if the unvulcanized rubber of the chloroprene rubber 29 is heat vulcanized, the outer layer material of the insulation coating of the water-resistant insulated wire 20 and the uncrosslinked EPR or unvulcanized or unvulcanized EPDM 32 are fused simultaneously. The uncrosslinked EPR or unvulcanized or non-vulcanized EPDM 32 and the chloroprene rubber 29 are bonded together by the vulcanizing adhesive 35. On the other hand, since the power cable sheath 10d of the power cable 10 is made of the same material as the chloroprene rubber 29, it can be bonded with the rubber glue. That is, both sides of the connecting portion A-1 are blocked from the liquid intrusion path and reliably stopped.

[Second Embodiment]
FIG. 4 is a water-stop treatment structure diagram of the connection portion A-2 of the power cable and the water-resistant insulated wire according to the second embodiment of the present application, and shows the AA cross-sectional arrow portion shown in FIG. In the figure, the same or corresponding parts as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals (however, each reference numeral is given a subscript “−2”). Items other than those described below are the same as those in the embodiment shown in FIGS.

  The difference from the first embodiment in this water-stopping treatment structure is that uncrosslinked EPR or unvulcanized or non-vulcanized EPDM 32-2 is wound around the water-resistant insulated wire 20-2 and the surface thereof is bonded to vulcanization. The range in which the agent 35 is applied is not the almost entire range in which the chloroprene rubber 29 is molded as in the first embodiment, but only the point in which the chloroprene rubber 29-2 is partly molded.

  Even if comprised in this way, the liquid penetration | invasion path | route will be interrupted | blocked and both sides of the connection part A-2 will stop water reliably.

[Third Embodiment]
FIG. 5 is a water-stop treatment structure diagram of the connection portion A-3 of the power cable and the water-resistant insulated wire according to the third embodiment of the present application, and shows the AA cross-sectional arrow portion shown in FIG. FIG. 6 is an enlarged schematic cross-sectional view of one connection portion A-3 in FIG. In both figures, the same or equivalent parts as those in the first embodiment shown in FIG. 1 and FIG. Items other than those described below are the same as those in the embodiment shown in FIGS.

  In this water stop treatment structure, the difference from the first embodiment is that uncrosslinked EPR or unvulcanized or non-vulcanized EPDM 32 is wound around each water-resistant insulated wire 20 as in the first embodiment. Instead of applying the vulcanizing adhesive 35 to the surface of the crosslinked EPR or unvulcanized or non-vulcanized EPDM 32, the insulating tape wrapped around the connection A-3 is uncrosslinked EPR or unvulcanized or non-vulcanized. Change to Sulfur-based EPDM 32-3, and unwrapped EPR or unvulcanized or non-vulcanized EPDM 32-3 must be wound to the extent that it overlaps with the insulation coating material of each water-resistant insulated wire 20, and a heat shrinkable tube Further, a vulcanizing adhesive 35-3 is applied to the surface of uncrosslinked EPR or unvulcanized or non-vulcanized EPDM 32-3 protruding from both ends of the heat shrinkable tube 33-3, Similarly to the first embodiment, the chloroprene rubber 29-3 is not added from the end of the power cable sheath 10d-3 on both sides of the connecting portion A-3 to the insulating covering material of the water-resistant insulated wire 20-3. Wrapped rubber is formed into a final shape, set in a mold, and heat vulcanized (heat vulcanized).

  With the above configuration, when the unvulcanized rubber of the chloroprene rubber 29-3 is heat vulcanized, the outer layer material of the insulation coating of the heat-resistant insulated wire 20-3 and the uncrosslinked EPR or unvulcanized or non-vulcanized At the same time as the sulfur-based EPDM 32-3 is fused, the uncrosslinked EPR or unvulcanized or non-vulcanized EPDM 32-3 and the chloroprene rubber 29-3 are bonded together by the vulcanizing adhesive 35-3. On the other hand, the power cable sheath 10d-3 of the power cable 10-3 is bonded to the chloroprene rubber 29-3 with a rubber glue, as in the first embodiment. That is, both sides of the connecting portion A-3 are surely stopped by blocking the liquid ingress path.

  If sufficient insulation characteristics are secured with uncrosslinked EPR or unvulcanized or non-vulcanized EPDM 32-3 and the vulcanizing adhesive 35-3 is applied to the entire surface, the heat shrinkable tube 33-3 May be omitted.

[Fourth Embodiment]
FIG. 7 is a cross-sectional view of the water stop treatment structure of the connection part A-4 between the water-resistant insulated wires according to the fourth embodiment of the present application. As shown in the figure, in this waterproofing treatment structure, the conductor portions protruding from the respective ends of the water-resistant insulated wires 20-4 and 20-4 using polyethylene or cross-linked polyethylene as the outer layer material of the insulation coating are soldered together. It is fixed and electrically connected by (solder part 36-4) to constitute a connection part A-4. An insulation treatment is performed by directly winding uncrosslinked EPR or unvulcanized or non-vulcanized EPDM32-4 around the connection portion A-4 so as to cover (enclose) the connection portion A-4.

  Further, the outer peripheral surface of the water-resistant insulated wires 20-4 and 20-4 is coated with a polyethylene heat-shrinkable tube 33-4 and heated, so that the outer layer material of the water-resistant insulated wires 20-4, 20-4 and the uncrosslinked EPR or unvulcanized Alternatively, at the same time that the non-vulcanized EPDM 32-4 is fused, the uncrosslinked EPR or unvulcanized or non-vulcanized EPDM 32-4 and the polyethylene heat shrinkable tube 33-4 are fused. Insulation treatment can be performed, and as a result, the liquid intrusion path is blocked on both sides of the connection portion A-4, and water is surely stopped.

[Fifth Embodiment]
FIG. 8 is a cross-sectional view of the water stop treatment structure of the connection portion A-5 between the water-resistant insulated wires according to the fifth embodiment of the present application. As shown in the figure, in this water-stopping treatment structure, the conductor portions protruding from the respective ends of the water-resistant insulated wires 20-5 and 20-5 using polyethylene or cross-linked polyethylene as an outer layer material for insulation coating are soldered together. It is fixed and electrically connected by (solder part 36-5) to constitute a connection part A-5. Insulation treatment is performed by directly winding uncrosslinked EPR or unvulcanized or non-vulcanized EPDM32-5 around the connection portion A-5 so as to cover (enclose) the connection portion A-5.

  Further, a vulcanizing adhesive 35-5 is applied to the outer peripheral surface, and an unvulcanized chloroprene rubber 29-5 is wrapped around the surface and heat vulcanized, whereby water-resistant insulated wires 20-5, 20-5. The non-crosslinked EPR or unvulcanized or non-vulcanized EPDM32-5 and the uncrosslinked EPR or unvulcanized or non-vulcanized EPDM32-5 and chloroprene are fused simultaneously The rubber 29-5 is bonded to perform insulation treatment, whereby the liquid intrusion path is blocked on both sides of the connection portion A-5 and water is surely stopped.

200 Liquid-sealed motor 220 Coil A-1 Connection 10 Power cable 10a, 10b, 10c Wire core 10d Power cable sheath 20 Water-resistant insulated wire 29 Chloroprene rubber 30 Insulating tape 31 Heat shrinkable tube 32 Uncrosslinked EPR or unvulcanized or Non-vulcanized EPDM
35 Vulcanizing adhesive A-2 Connection 10-2 Power cable 10a-2, 10b-2, 10c-2 Wire core 10d-2 Power cable sheath 20-2 Water-resistant insulated wire 29-2 Chloroprene rubber 32-2 Not yet Cross-linked EPR or unvulcanized or non-vulcanized EPDM
35-2 Adhesive for Vulcanization A-3 Connection Portion 10-3 Power Cable 10a-3, 10b-3, 10c-3 Wire Core 10d-3 Power Cable Sheath 20-3 Water Resistant Insulated Wire 29-3 Chloroprene Rubber 32- 3 Uncrosslinked EPR or unvulcanized or non-vulcanized EPDM
33-3 Heat Shrink Tubing 35-3 Vulcanizing Adhesive A-4 Connection 20-4 Water Resistant Insulated Wire 32-4 Uncrosslinked EPR or Unvulcanized or Unvulcanized EPDM
33-4 Polyethylene heat shrinkable tube A-5 Connection 20-5 Water resistant insulated wire 29-5 Chloroprene rubber 32-5 Uncrosslinked EPR or unvulcanized or unvulcanized EPDM
35-5 Adhesive for vulcanization

Claims (4)

In a liquid ring motor, water resistant insulation that connects the water resistant insulated wire with the coil wire surface covered with an insulation coating and the power cable inserted from the outside of the liquid ring motor to stop the connection. In the water stop treatment structure of the connection part of the wire
The outer layer material of the insulating coating is made of polyethylene or cross-linked polyethylene, and uncrosslinked EPR or unvulcanized or non-vulcanized EPDM is directly wound around the surface of the outer layer material of the insulating coating and further vulcanized on the outer peripheral surface thereof. The outer layer material of the insulation coating of the water-resistant insulated wire and the uncrosslinked EPR or unvulcanized Or a non-vulcanized EPDM, and at the same time, the uncrosslinked EPR or unvulcanized or non-vulcanized EPDM and chloroprene rubber are bonded together to stop the water. Water stop treatment structure at the connection. In the water stop processing structure of the connection part of the water-resistant insulated wire according to claim 1,
Said connection portion is located centrally between the insulating covering material end of the water insulated wire and chloroprene rubber of the power cable sheath end, wherein the unvulcanized chloroprene rubber insulating coating material before Symbol water insulated wire pressurized et the power is cable wound to the end of the sheath is molded integrally with the heat vulcanization, thereby waterproofing the connection portion of the water insulated wire, characterized in that bonding between the power cable sheath and the chloroprene rubber Processing structure.



  Insulation treatment is performed by directly wrapping uncrosslinked EPR or unvulcanized or non-vulcanized EPDM around the part where water-resistant insulated wires using polyethylene or crosslinked polyethylene as the outer layer material of insulation coating are connected, Further, the outer peripheral surface of the outer sheath material of the water-resistant insulated wire and the uncrosslinked EPR or unvulcanized or non-vulcanized EPDM are fused by coating a polyethylene heat-shrinkable tube on the outer peripheral surface and heating. At the same time, the non-crosslinked EPR or the unvulcanized or non-vulcanized EPDM and the polyethylene heat-shrinkable tube are fused to stop the water, and the water-stopping treatment is performed on the connection portion of the water-resistant insulated wire. Construction.   Insulation treatment is performed by directly wrapping uncrosslinked EPR or unvulcanized or non-vulcanized EPDM around the part where water-resistant insulated wires using polyethylene or crosslinked polyethylene as the outer layer material of insulation coating are connected, Furthermore, by applying an adhesive for vulcanization to the outer peripheral surface and wrapping unvulcanized chloroprene rubber on the surface and heat vulcanizing, the outer layer material of the insulation coating of the water-resistant insulated wire and the uncrosslinked EPR or Water resistance, characterized in that the unvulcanized or non-vulcanized EPDM is fused, and at the same time, the uncrosslinked EPR or unvulcanized or non-vulcanized EPDM and chloroprene rubber are adhered and water-stopped. Water stop treatment structure for the connection part of insulated wires.

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