JP3314895B2 - How to connect wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting wires for driving electric equipment such as an ammonia compressor and a submersible pump in a conductive corrosive atmosphere.

[0002]

2. Description of the Related Art In a driving electric machine such as an ammonia compressor or a submersible pump in a conductive corrosive atmosphere, an insulating layer covering a wire loop has a flammable, toxic, and moisture absorbing property of a conductor. For example, a material which is not affected by an atmosphere such as a polyethylene resin or an ethylene tetrafluoride resin is used. Since the insulating layer of such a wire loop needs to maintain perfect airtightness with respect to the core wire, the core wire is continuously coated in the electric wire manufacturing process. Thereby, a highly insulated and reliable insulated wire (wire loop) is obtained.

Since the above-mentioned wire loop is required to have perfect airtightness and corrosion resistance in addition to electrical insulation, a connecting portion of the wire loop must have a structure satisfying these requirements.

Conventionally, as a connection structure of such a wire loop, a connection portion is wound around with an electric insulating tape or the like coated with an adhesive,
Alternatively, a connection structure in which a connection portion is covered with a heat shrink tube or the like has been provided.

[0005] However, in the case of the above-described connection structure, airtightness and electrical insulation are lost due to a heat cycle and aging, and a problem that the device cannot be used is often observed. As an example, in a case where a submersible pump and a drive motor for driving the submersible pump are housed in an integrated container, periodic inspection, replacement of a wire ring, repair, etc. are performed. To prevent
The fact is that the cycle must be short.

Further, in a hermetic motor in which an ammonia compressor and a motor for driving the ammonia compressor are housed in a single container, the insulation, airtightness,
No effective solution to the deterioration of corrosion resistance etc. has been provided,
Insufficient reliability and the frequency of disassembly and inspection has to be increased.

FIG. 3 shows a wire connection structure for solving the above-mentioned problems. FIG.
Indicates the case of parallel connection.

In FIG. 3, reference numerals 01 and 02 denote core wires of wire loops to be connected, reference numeral 03 denotes an insulating coating made of polyethylene resin which covers the core wires, and reference numeral 4 denotes an insulating tape. When connecting the wire loops, the core wires 01 and 02 are twisted, the twisted portions are joined by soldering, and the outer periphery thereof is wound with an insulating tape 04 coated with an adhesive.

[0009]

However, the conventional connection structure as shown in FIG. 3 covers the connection portion when applied to a wire used in an environment filled with a conductive fluid. There is a problem that gaps and pinholes are generated in the insulating tape 4, which cause insulation failure, cannot withstand long-time use, and loses reliability.

[0010] In view of the above problems, the present invention provides a highly reliable wire without deterioration in the airtightness and electrical insulation of the wire connection even after long-time use in a conductive corrosive atmosphere. The purpose is to obtain a connection method.

[0011]

According to the present invention, core wires to be connected are joined by soldering or the like, and the joined portion is covered with a first layer material made of a low-temperature melting material such as polyethylene resin. A second layer material such as a fluorine-based resin having a higher melting point and heat shrinkability is wound around the outer periphery of the first layer material,
The gist is a connection method in which pressure is applied to the first layer material by heating both layers and the first layer material is fused to the core wire.

A second gist of the present invention is that, when the second layer material is wound around the outer periphery of the first layer material, a narrow gap through which a melt of the first layer material can leak is left at the tip. And

That is, the first aspect of the present invention is a conductive corrosive
There are parallel, series, and wire cores of wire loops placed in the atmosphere
Or when connecting in series and parallel, solder the ends of the core wires
After forming a joint that is electrically joined by attaching
Is made of low-temperature melting material such as polyethylene resin.
Covered with a first layer material, such as by winding, and then a fluororesin
Having a higher melting point and heat shrinkability than the first layer material such as
With the second layer material, the melt of the first layer material can leak to the tip
The outer periphery of the first layer material is left with a gap, leaving a functional gap.
Winding the first layer material and the second layer material into the first layer material.
Heating to a temperature at which the material melts and the second layer material thermally shrinks ,
The first layer material melted from the slit at the winding end of the second layer material
When the leakage was confirmed, the heating was stopped, while the second layer was
When the first layer material is melted between the winding layers of the material,
Since the coating will not be complete,
It is characterized in that the coating of the two-layer material is restored.

According to a second aspect of the present invention, an electrode penetrating the wall of the container is projected into a container in which a refrigerant such as ammonia is present, and the wall penetrating portion of the electrode is connected to a terminal holder. When connecting the electrode and a core wire of a wire connected to the electrode in the assembled connection terminal held in a fluid-tight state via a wire, the core wire is insulated by a polyethylene resin.
Is coated with covering layers, the through electrode rod and the retainer are insulated retaining structure at full fluororesin-based insulator, wire end of該線wheel
And the electrode end by soldering to form a joint
And the core-side insulating coating layer connected to the joint and the joint
A through electrode rod wound in a first layer material comprising a site between the fluoroplastic insulator from the cold molten material poly <br/> ethylene resin
More coated and then the outer periphery of the first layer material, a fluorine-based
It has a higher melting point and heat shrinkability than the first layer material such as resin.
Wound without residing gaps on the outer periphery in the second layer material for the first layer material and the second layer material, said first layer material is melted and the
It is characterized in that the two-layer material is heated to a temperature at which the two-layer material is thermally shrunk, so that the first layer material and a part of the insulating coating layer of polyethylene resin are melt-integrated and fused to the core wire.

Further, the invention according to claim 3 is characterized in that
A compressor used as a refrigerant and driving the compressor
The motor is housed in a sealed container with the motor
Upon connecting line wheels Mechikku type motor to each other, the
The insulation coating layer of the wire loop is made of a polyethylene resin layer, and the wire is
Join the ends of the core wires of the ring by soldering, etc.
Formed, and connected to the joining portion and the joining portion of the insulating coating layer.
Is made of low-temperature melting material of polyethylene resin.
One layer material is coated by winding and then the outer periphery of the first layer material
Having a higher melting point than the first layer material such as a fluororesin and
No gaps on the outer periphery due to the heat shrinkable second layer material
And winding the first layer material and the second layer material so that the first layer material is
The first layer is melted and heated to a temperature at which the second layer material thermally shrinks.
The core wire is fused by melting a part of the material and the insulating coating layer.
It is characterized by closing .

[0016]

According to this technical means, the core wires to be connected are joined by soldering or the like, and this joint is covered with a first layer material made of a low-temperature melting material such as polyethylene resin. After winding a high-melting and heat-shrinkable second layer material such as a fluororesin around the outer periphery, heating the connecting portion with a heater or the like melts the low-melting first layer material and joins the core wires. While it fuses to the portion, the outer second layer material shrinks due to its heat shrinkability.

As a result, the second layer material exerts an action of applying an external pressure to the joint of the core wires via the first layer material so as to bind the core wire. Fusing, the connection is completely sealed, and complete insulation is obtained.

Further, if the above connection method is applied to connection of a wire in a container such as a housing of a hermetic motor in which a refrigerant such as ammonia gas is present, mechanical vibration, thermal expansion, corrosive atmosphere, etc. The sealing and insulation properties are not impaired over a long period of time, and high reliability can be maintained.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely described. It is only an example.

First, referring to FIG. 1, the structure of a connection portion of a wire loop for an electric device according to the present invention will be described in accordance with a connection procedure.
In FIG. 1, reference numerals 1 and 2 denote core wires connected to each other, and use conductive wires having good electric conductivity. 3 is each core wire 1, 2
A thermoplastic polymer insulating material such as polyethylene or polypropylene is used as an insulating coating layer for covering the surface of the substrate.

The insulating coating layer 3 covers the core wires 1 and 2 in a hermetically sealed state in the manufacturing process of the wire loop. The ends of the core wires 1 and 2 are exposed by removing the coating with the coating layer 3, and after twisting both, soldering is performed.

Reference numeral 4 denotes a polyethylene tape which is a first layer material. The tape 4 is wound around the outer circumferences of the core wires 1 and 2 which are twisted as described above. Reference numeral 5 denotes a heat-shrinkable fluororesin tape of a second layer material, which is wound in a cigar shape over the entire outer periphery of the polyethylene tape 4.

After winding the fluororesin tape 5, the first
If the connection part wound by the layer material 4 and the second layer material 5 is heated by a heater or the like, the polyethylene tape 4 of the first layer material is melted, but the fluororesin tape 5 of the second layer material is not melted. It begins to shrink due to its heat shrinkability. As a result, the fluororesin tape 5 binds the twisted joint between the polyethylene 4 and the core wires 1 and 2 of the first layer material, and the polyethylene 4 melts and enters the gap between the twisted joints between the core wires 1 and 2. Then, the gap is sealed.

In this case, as shown in FIG. 1B, when the molten polyethylene leaks from the winding layer of the fluororesin tape 5 wound on the outermost peripheral portion as shown in FIG. Since the coating with the fluororesin tape 5 is not complete, the coating of the fluororesin tape 5 at the leaked portion is repaired.

On the other hand, if a small-diameter hole 51 is formed at the end of winding when the fluororesin tape 5 is wound, the polyethylene melted when heated after the winding of the fluororesin tape 5 can be obtained. 1 (A) As shown by reference numeral 22, the gas leaks from the hole 51. Thereby, it can be confirmed that the first layer material 4 is completely melted, and the heating is stopped at this point.

Such a leak portion 22 appears, and FIG.
If the leakage portion 21 as shown in FIG. 3B does not appear, the fluororesin tape 5 has been completely wound without any gap.

FIG. 2 is a structural view of a terminal penetrating a container (housing) 11 of a hermetic motor filled with a conductive fluid such as ammonia refrigerant to which the connection method of the above embodiment is applied.

In FIG. 2, 11 is a container filled with ammonia, 8 is an electrode rod inserted into the container 11, 1
Reference numeral 0 denotes a terminal retainer screwed into the terminal mounting screw hole 11a of the pressure vessel in a watertight state, and 9 denotes a tightening screw screwed into the mounting screw hole 10a of the retainer 10.

The outer periphery of the electrode rod 8 is previously coated with an insulating coating layer 13 made of a polyethylene resin material.
Reference numeral 7 denotes a bush made of a highly fusible material such as a fluororesin.
It is fitted around the outer periphery of the insulating covering material 13 . The bush 7 allows the electrode rod 8 to be held in the terminal holder 10 in an airtight state by tightening the tightening screw 9 to the holder 10.

Reference numeral 1 denotes a core wire, and reference numeral 12 denotes an insulating coating layer made of a polyethylene resin material. The core wire 1 is coated with the insulating coating layer 12 in advance. Core wire 1 and electrode rod 8
In a state where they are butted against each other (series connection), the polyethylene tape 4 of the first layer material is wound, and the fluororesin 5 of the second layer material is further wound around the outer periphery thereof.

Next, when this connection portion is heated, the polyethylene tape 4 (first layer material) having a low melting point and the insulating coating material 12 of the polyethylene material previously coated are melted similarly to the embodiment of FIG. Further, the core wire 1 and the electrode rod 8 are fused to each other by the securing force of the tape 5 and the bush 7 made of a heat-shrinkable fluororesin material.

[0032] Then, when returned to room temperature and releasing the heat, the polyethylene resin material 12, 4 which has been melted mass is completely secured to the wire 1 and the electrode.

[0033]

As described above, according to the present invention, the first layer material having a low melting point sufficiently penetrates into the joint portion between the core wires by heating and is fused to the core wire, and the second layer having heat shrinkability is provided. Due to the securing action of the material, the connection of the wire loop is made with higher airtightness.

If a slit is formed at the end of the winding end of the second layer material as described in claim 1, the first layer material leaks out of the slit at the time of heating. Can be confirmed and the sealing by the second layer material can be confirmed, and more reliable airtightness can be obtained.

As a result, it is possible to obtain a wire ring connection structure in which airtightness and electrical insulation are maintained in a conductive corrosive atmosphere such as ammonia gas.

[Brief description of the drawings]

1A and 1B are cross-sectional views showing a connection structure of a wire loop according to an embodiment of the present invention, wherein FIG. 1A shows a good connection state, and FIG.

FIG. 2 is a sectional view of a terminal portion when the connection structure according to the present invention is applied to a connection structure of a wire loop in a container of a hermetic motor in which ammonia gas or the like exists.

FIG. 3 is a cross-sectional view showing a conventional connection structure of a wire loop.

[Explanation of symbols]

 1, 2 core wire 3 insulating coating layer 4 first layer material 5 second layer material 51 slit 8 electrode 10 terminal holder 11 container

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 4/22-4/72 H01R 43/00

Claims (3)

(57) [Claims] When connecting the core wires of a wire placed in a conductive corrosive atmosphere in parallel, series, or series-parallel, the ends of the core wires are electrically connected by soldering or the like.
After forming the joint, the joint is covered by the winding or the like in the first layer material consisting of low-melting material such as polyethylene resin, followed by than the first layer material, such as a full Tsu Motokei resin A second layer material having a high melting point and heat shrinkability, wherein the first layer
Outside the first layer material, leaving a gap through which the melt of the material can leak.
The circumference is wound without any gap, and the first layer material and the second layer material are melted by the first layer material and
The first layer material is heated to a temperature at which the second layer material thermally shrinks , and the first layer material melted from the slit at the winding end portion of the second layer material.
When the leakage is confirmed, the heating is stopped . On the other hand , when the first layer material is melted from the wound layer of the second layer material,
Since the coating of the second layer material is not complete,
Repairing the coating of the second layer material in the above . 2. An electrode penetrating the wall of the container is protruded into a container in which a refrigerant such as ammonia is present, and the wall penetrating portion of the electrode is held in a fluid-tight state via a terminal holder. In the assembled connection terminal, when connecting the electrode and a core wire of a wire connected to the electrode, the core wire is a polyethylene resin insulating coating layer.
The penetrating electrode rod is covered and insulated and held by the cage with a fluororesin-based insulator, and the core end of the wire and the electrode end are joined by soldering or the like.
To form a joint portion, and penetrate with the joint portion and the core-side insulating coating layer connected to the joint portion.
Passing the electrode rod is coated by <br/> Ri the winding site in the first layer material consisting of polyethylene <br/> Len based resin low temperature molten material fat between the fluoroplastic insulator, then the second The outer periphery of the one-layer material is made of fluororesin
Having a higher melting point and heat shrinkability than the first layer material such as
The second layer material is wound without any gap, and the first layer material and the second layer material are melted and the second layer material is heated.
A method of connecting a wire loop, wherein the wire is heated to a shrinking temperature to melt-integrate a part of the first layer material and the insulating coating layer of polyethylene-based resin and to fuse the core to the core wire. 3. A compression system using ammonia as a refrigerant.
And the electric motor that drives the compressor are sealed in an integrated container
The wires of the hermetic motor, which is stored in
When connecting to, the insulation coating layer of the wire loop and a polyethylene resin layer,
The ends of the core wire of the wire loop are joined by soldering or the like.Join
Form a part,  The joint and theSite of the insulating coating layer connected to the joint
ToFirst layer material composed of low temperature melting material of polyethylene resin
Then, the outer periphery of the first layer material is
Higher melting point and heat shrink than the first layer material such as nitrogen-based resin
Second layer materialWithout leaving a gapWinding, front
The first layer material and the second layer materialThe first layer material is melted and
To the temperature at which the two-layer material shrinksHeat the first layer material and insulation
Melting a part of the covering layer and fusing the core wire.
Characteristic connection method of wire loop.