JP4338158B2 - Internal connection method for feedthrough terminals such as sealed motors - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal connection method for a through connection terminal such as a hermetic motor, which connects between a power supply terminal and a lead wire of a stator wire ring in the hermetic motor.
[0002]
[Prior art]
A sealed electric motor for driving an ammonia device has a sealed structure in order to prevent ammonia gas leaking from a shaft seal.
For this reason, the lead wire of the stator wire ring inside the motor frame is hermetically penetrated through the frame via a flexible flexible relay wire, and is pulled out to be connected to the power source terminal. There is a problem with sex.
Alternatively, a rod-shaped through connection terminal that penetrates the power supply terminal portion in an airtight manner is provided and connected to the lead wire inside the through connection terminal, but the operation is not easy and difficult to complete. there were.
In any of the above methods, it is necessary to connect the external power supply and the lead wire of the internal stator wire ring through the sealed frame in an airtight manner. However, the latter method is generally used, and the power supply terminal portion is insulated. There is a method in which a member is provided in an airtight manner, and an insulation treatment is performed by directly connecting to a lead wire of the stator wire ring in a space inside the frame to a through connection terminal fixed in an airtight manner through the insulating member. .
[0003]
By the way, it is impossible to design a sufficient space necessary for the welding operation of the connection site and the insulation treatment of the connection site performed when connecting the lead wire and the through connection terminal. Forced.
In addition, in a motor for driving a compressor using ammonia refrigerant, the stator wire ring and the through connection terminal use aluminum members as a corrosion-resistant measure against ammonia gas, and the connection requires welding work. It is difficult to expect reliable work with great difficulty in connecting and insulating in a narrow space.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and in a connection between the lead wire of the stator wire ring of the sealed motor for ammonia-resistant motor whose aluminum wire member is aluminum and the through connection terminal for the power supply terminal, a narrow space is provided. Even in a terminal structure that can maintain airtightness, the aluminum materials must be securely connected to each other in a space where electric welding or gas welding is possible, and through-connection terminals such as highly reliable sealed motors can be used. Provide an internal connection method.
[0005]
[Means for Solving the Problems]
Therefore, the internal connection method of the through connection terminal such as the sealed electric motor of the present invention is as follows.
In the method of connecting the power supply terminal of the ammonia-resistant sealed electric motor with the winding member made of aluminum and the stator wire ring in the frame that seals the stator and the rotor,
A flexible connecting wire having a length that connects between a through connection terminal that forms a power supply terminal through the terminal portion of the frame to be sealed, and a frame inner end portion of the through connection terminal and a stator wire ring lead wire And prepare
A power supply terminal chamber for attaching the through connection terminal in an airtight manner is provided at the upper part of the frame on the open space side of the frame, and the through connection terminal and the flexible relay line are welded so as to be located in the open space inside the frame. connection,
On the other hand, the lead wire of the stator wire ring in the frame is led out to the open space side, and the lead wire and the flexible relay wire are welded and insulated on the open space side, and the through connection terminal and the flexible wire are connected. The relay line is made of an aluminum member or an aluminum plated member, and the through-connection terminal with the relay line is covered with an insulating member made of polyethylene or Teflon resin in an airtight manner .
[0006]
The present invention employs a through-connection terminal in which a power supply terminal structure such as a hermetic motor is airtightly fixed inside and outside of the frame to be sealed in order to maintain the air density in the frame of the motor, and in particular ammonia gas as a refrigerant. When using, there is a problem that it is necessary to employ an aluminum member having a low conductivity and to employ a welding connection which is a more reliable connection method.
[0007]
Therefore, instead of using the conventional connection method that involves unreasonableness in narrow spaces to connect at the shortest distance, the connection position is changed to an open space on the side face of the stator wire ring. By adding a flexible relay line to the site, a reliable connection, a reliable insulation treatment, and a marginal connection are made possible.
[0008]
As described above, a through connection terminal and a flexible relay wire of a predetermined length are separately prepared, and the two are welded and insulated before being attached to the sealing frame, and the through connection with the relay wire is previously made. Form a terminal.
Next, the formed through-connection terminal with a relay line is fixed to the terminal portion of the frame in an airtight manner via an insulating member.
After that, the open end of the flexible relay connection of the fixed through connection terminal is welded and insulated in the open space with a margin between the stator wire ring lead wire and the side end of the stator wire ring. It is what I did.
[0009]
[0010]
Further, the present invention is a hermetically sealed electric motor for driving a compressor using ammonia refrigerant, and completely prevents corrosion without contact with the high-pressure ammonia vapor leaking from the shaft seal device of the compressor. It is something that can be done.
[0011]
[0012]
The present invention is also capable of completely preventing corrosion due to refrigerant leakage with respect to a hermetic motor directly connected to a compressor using ammonia refrigerant.
[0013]
In addition, the connection part of the said penetration connection terminal, a flexible relay line, and a stator wire lead-out line employs reliable connection methods, such as welding, peeling of a connection part by vibration etc., and a connection part by a secular change. The increase in contact resistance and the accompanying heating and fusing are eliminated, and the reliability of the hermetic motor is improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, unless otherwise specified, the shape and other relative arrangements of the components described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention.
FIG. 1 is a diagram showing a schematic configuration of a through-connection terminal with a relay line used in an internal connection method for a through-connection terminal such as a sealed electric motor of the present invention, and FIG. 2 is a through-connection terminal with a relay line shown in FIG. FIG. 3 is a front view showing the situation of the power supply terminal portion of the sealed motor using the lead wire and the lead wire of the stator wire ring, and FIG. 3 shows the through-connection terminal with a relay line in FIG. FIG. 4 is a diagram showing a state of connection with the lead wire of the stator wire ring with the through-connection terminal with a relay line of FIG. 1 attached thereto.
[0015]
The internal connection method of a through-connection terminal such as a hermetic motor according to the present invention includes a first step of forming a through-connection terminal with a relay line and a second step of attaching the formed through-connection terminal with a relay line to a terminal portion. And the third step of connecting the lead wires in the open space on the side surface of the end portion of the stator wire ring.
In FIG. 1, the 1st process of forming the said penetration connection terminal with a relay line is shown.
That is, the through-connection terminal 20 with a relay line is composed of a bar-shaped through-connection terminal 10 made of aluminum or plated with aluminum and a flexible relay line 11, and the end 10a of the inside of the sealed frame of the bar-shaped through-connection terminal 10 The end of the flexible relay wire 11 forms a complete joint portion by welding joining, causes poor connection due to vibration of a compressor or the like operated by the same drive shaft, and heat due to poor connection occurring at the connection site, They try to eliminate any disconnection accidents.
[0016]
As shown in FIG. 2, the through-connection terminal 20 with a relay line is used for a power supply terminal structure that supplies driving power to the stator wire ring 15 of the electric motor in the sealing frame 18.
In addition, a stator iron core 53 of an electric motor is provided in the sealing frame 18, a stator wire ring 15 is provided in the iron core, and a power terminal room 54 is provided with an opening at the top of the sealing frame to form a power terminal part. The through-connection terminal 20 with a relay line is attached to the mounting hole 20a in an airtight manner via an insulating member, and the flexible relay line 11 of the through-connection terminal 20 with the relay line is connected to the lead wire 16 of the stator wire ring 15. Connected.
[0017]
FIG. 3 is a diagram showing a second process, showing a state of attachment of the through-connection terminal 20 with relay line to the power supply terminal chamber 54. In FIG. The connecting terminal 20 is placed through the insulating member 14 so that the flexible relay line is located inside the frame, and the fixed through terminal mounting plate 13 is attached to the power terminal chamber 54 in an airtight manner.
In addition, the insulation protection material in the case of using ammonia refrigerant is almost restricted to polyethylene or Teflon resin.
[0018]
FIG. 4 shows a third step. As described above, the flexible relay wire 11 of the feedthrough terminal 20 with a relay wire provided in an airtight manner in the power terminal chamber 54 is connected to the lead wire of the stator wire 15. The situation of connection with 16 is shown. The connection between the lead wire 16 and the flexible relay line 15 in FIG. 6A is reliably performed in the open space 17 with sufficient welding connection and insulation treatment as shown in FIG. .
[0019]
【The invention's effect】
As described above, the internal connection is made in the order of the through connection terminal → the formation of the through connection terminal with the relay line → the attachment process of the through connection terminal with the relay line → the connection process of the lead wire in the open space. Since a flexible relay wire with a predetermined length that is not too short is provided, connection and insulation work can be performed very easily and reliably in an open space. When ammonia gas is used as a refrigerant, optimum ammonia resistance An internal connection method for a sealed electric motor is provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a through-connection terminal with a relay line used in an internal connection method for a through-connection terminal such as a sealed electric motor according to the present invention.
2 is a front view showing a state of a power supply terminal portion and a lead wire of a stator wire ring of a hermetic motor using the through-connection terminal with a relay line shown in FIG. 1. FIG.
3 is a view showing a situation where the through-connection terminal with a relay line in FIG. 1 is attached to the power supply terminal portion of the sealing frame in an airtight manner through a through-terminal attachment plate.
4 is a diagram showing a connection state with a lead wire of a stator wire ring by mounting the through-connection terminal with relay line of FIG. 1; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Through-connection terminal 11 Flexible relay line 12 Insulation processing part 13 Through-terminal attachment board 14 Through-terminal insulator 15 Stator wire ring 16 Lead wire 17 Open space 18 Sealing frame

Claims (1)

In the method of connecting the power supply terminal of the ammonia-resistant sealed electric motor with the winding member made of aluminum and the stator wire ring in the frame that seals the stator and the rotor,
A flexible connecting wire having a length that connects between a through connection terminal that forms a power supply terminal through the terminal portion of the frame to be sealed, and a frame inner end portion of the through connection terminal and a stator wire ring lead wire And prepare
A power supply terminal chamber for attaching the through connection terminal in an airtight manner is provided at the upper part of the frame on the open space side of the frame, and the through connection terminal and the flexible relay line are welded so as to be located in the open space inside the frame. connection,
On the other hand, the lead wire of the stator wire ring in the frame is led out to the open space side, and the lead wire and the flexible relay wire are welded and insulated on the open space side, and the through connection terminal and the flexible wire are connected. The relay wire uses an aluminum member or an aluminum plated member, and the through-connection terminal with the relay wire is hermetically covered with an insulating member made of polyethylene or Teflon resin. Internal connection method for feedthrough terminals such as electric motors.

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