JPH04317532A - Insulator for motor winding - Google Patents

Abstract

PURPOSE:To provide an insulator for motor winding in which the insulation resistance of compressor does not degrade even if 'Fleon 22(R)' or 'Fleon 134(R)' is employed as the refrigerant of the compressor. CONSTITUTION:Joint 15 of a motor winding and a lead wire is contained in a containing part 13 secured to the coil end thus constituting an insulator. After the joint 15 is inserted into the containing part 13, opening 21 of an insulating sheet 11 is heated and welded so that the containing part 13 of the insulating sheet 11 is sealed hermetically.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating device for motor windings, and more particularly to an insulating device for motor windings that improves the sealing properties of the connections of the motor windings.

0002

2. Description of the Related Art In general, hermetic or semi-hermetic compressors are known in which an electric motor and a compressor are housed in the same hermetic container. In this type of motor, the refrigerant passes around the motor windings, so it is necessary to electrically insulate the refrigerant and the connection portion of the motor windings. For this purpose, conventionally, the connection portion of the motor winding is housed in an insulating sheet storage part, and this insulating sheet is fixed to the coil end of the winding (for example, Japanese Utility Model Application No. 63-29359).

[0003] As shown in FIGS. 8(a) and 8(b), in this type of device, a connection portion 53 between the motor winding and the lead wire is sandwiched between two folded insulating papers 51, and this is connected to the motor. It can be fixed to the coil end (not shown) of the winding, or
As shown in (b), the connection part 53 is stored in a storage part formed by folding an insulating paper 51 into three, and is fixed to the coil end of the winding.

Further, as shown in FIGS. 10(a) and 10(b), one side 55a of a cylindrical insulating paper 55 is welded to form a bag-shaped storage section, and a connecting section 53 is connected to the storage section. It can be stored and fixed to the coil end (not shown) of the winding, or as shown in Figure 11.
As shown in (a) and (b), one side of the heat-shrinkable tube 57 is welded to form a bag-shaped storage part, the connecting part 53 is stored in this storage part, and the tube 57 is heat-shrinked. After
It is constructed by being fixed to the coil end of the winding.

In FIGS. 8 to 11, 61 is a lead wire;
63 is a motor winding.

[0006]

[Problems to be Solved by the Invention] However, in this type of conventional configuration, Freon 12 (R-
12), it is possible to secure an insulation resistance value that can withstand practical use, but when using Freon 22 (R-22) or Freon 134 (R-134) as a substitute for Freon 12 (R-12), In this case, the problem arises that the insulation resistance value decreases.

In order to solve this problem, as shown in FIG. 11, when a heat shrink tube 57 is used, the oligomer is extracted from the tube 57, which dissolves in the refrigerant and circulates inside the compressor. Therefore, there is a problem in that it adheres to compressor parts and causes various troubles.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the problems of the conventional techniques described above, and to reduce the insulation resistance of the compressor even if Freon 22, Freon 134, etc. are used as the refrigerant of the compressor. The object of the present invention is to provide an insulating device for motor windings that does not cause any damage to the motor windings.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention stores the connecting portion between the motor winding and the lead wire in a storage section made of an insulating sheet, and stores the connection section between the motor winding and the lead wire in the storage section. In the insulating device for motor windings fixed to the coil ends of the invention, the opening of the storage section is welded so as to seal the storage section after the connection section is accommodated.

[0010] Another aspect of the present invention is characterized in that it includes a bent portion that narrows the opening width of the entrance of the storage portion after the connecting portion is stored.

Furthermore, another invention is characterized in that varnish or resin is sealed in the housing portion after housing the connecting portion.

0012

[Operation] According to the present invention, the opening of the insulating sheet is welded so as to seal the insulating sheet storage part, and the opening of the insulating sheet is welded to narrow the opening width of the insulating sheet storage part entrance. In order to prevent the refrigerant from coming into contact with the connection part, the connection part between the motor windings and the lead wires is bent, or varnish or resin is sealed in the storage part of the insulating sheet to cover the connection part between the motor windings and the lead wires. Since the sealing performance of the connection between the motor winding and the lead wire is much improved compared to conventional ones, Freon 22 or Freon 134 can be used as a refrigerant in the compressor instead of the commonly used Freon 12. Even when used, the insulation resistance of the compressor is prevented from decreasing.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor winding insulating device according to the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 2, reference numeral 1 designates a stator core of a motor, and three-phase windings, U-phase, V-phase, and W-phase, are wound around this stator core 1. This electric motor is built into, for example, a hermetic compressor (not shown), and the coil ends 3, 5, and 7 of each phase are bound by a binding thread 9.
It is arranged into a predetermined shape. The connection portion of the three-phase winding is housed in a housing portion 13, which will be described later, and is held between coil ends 3 and 5, as shown in FIG. 12 is the leader line (
lead wire).

As shown in FIG. 1(a), the storage section 13 includes:
After the insulating sheet 11 is made into a cylindrical shape, one end portion 11a is thermally welded using ultrasonic waves to form a bag shape, and a storage portion 13 is formed inside the sheet. As shown in FIG. 1(b), a connection portion 15 between the motor winding 17 and the lead wire 19 is inserted into the storage portion 13.

According to this embodiment, the storage section 1
3, the connecting portion 15 is inserted, and then the opening 21 of the insulating sheet 11 is heated (or ultrasonic heating may be used) and welded so that the storage portion 13 is sealed. According to this, as shown in FIG. 3, when the insulating sheet 11 is sandwiched between the coil ends 3 and 5 and bound with the binding string 9, the inside of the storage part 13 is sealed, so that the connection part The sealing performance of No. 15 is improved compared to the conventional one.

Therefore, Freon 22 (R-12), which is commonly used as a refrigerant for compressors, can be used instead of Freon 12 (R-12).
R-22) or Freon 134 (R-134) can also prevent the insulation resistance of the compressor from decreasing.

FIG. 4 shows another embodiment.

Here, as shown in FIG. 4(a), the storage portion 33 is formed by forming the insulating sheet 31 into a cylindrical shape, and then inserting the insulating sheet 31 into one end portion 3.
1a is welded to form a bag shape. This storage section 3
3, a connecting portion 15 between the motor winding 19 and the lead wire 17 is inserted, as shown in FIG. 4(b).

According to this embodiment, the connecting portion 15 is inserted into the storage portion 33, and then the opening portion 35 is bent so as to narrow the opening width of the entrance of the storage portion 33. According to this, the insulating sheets 31 overlap four times at the position of the connection part 15, so that the insulating sheets 31 overlap as shown in FIG.
is sandwiched between the coil ends 3 and 5, and tied with the binding thread 9.
When bundling together, the insulation of the connecting portion 15 can be strengthened.

Therefore, as mentioned above, as a substitute for the commonly used Freon 12 (R-12), Freon 22 (R-12) can be used.
-22) or Freon 134 (R-134) or the like is used in the compressor, it is possible to prevent the insulation resistance of the compressor from decreasing. Furthermore, as shown in FIG. 5, when inserting the storage section 33 between the windings 36 and 37 of the electric motor, the bent opening 35 of the storage section 33 tries to restore its original shape. It is possible to reliably prevent the connecting portion 15 from coming out.

FIG. 6 shows another embodiment.

In this example, the insulating sheet 41 is
), it is folded in half and its storage part 4 is
3, as shown in FIG. 6(b), a connecting portion 15 between the motor winding 19 and the lead wire 17 is sandwiched.

According to this embodiment, the storage section 4
3, after sandwiching the connecting portion 15, the connecting portion 15 is molded with varnish or resin 45. According to this, connection part 1
5 is bonded with varnish or resin 45, the sealing performance of the connecting portion 15 is significantly improved compared to conventional ones. Therefore, similarly to the above, Freon 12 (R
-12), even if a refrigerant such as Freon 22 (R-22) or Freon 134 (R-134) is used in the compressor, it is possible to prevent the insulation resistance of the compressor from decreasing.

Although the present invention has been described above based on one embodiment, it is clear that the present invention is not limited to this. For example, in the above configuration, as shown in FIG.
Needless to say, the present invention can be applied to an integrated insulating sheet 47 having a

[0026]

As is clear from the above description, according to the present invention, the opening of the insulating sheet is welded so as to seal the insulating sheet storage part, and the width of the opening of the entrance of the insulating sheet storage part is fixed. The opening of the insulating sheet is bent to narrow the area, and the connection between the motor winding and the lead wire is molded with varnish or resin, which greatly improves the sealing performance of the connection compared to conventional ones. can be done. Therefore, even if a refrigerant such as Freon 22 or Freon 134 is used in the compressor as a substitute for the commonly used Freon 12, it is possible to prevent the insulation resistance of the compressor from decreasing.

[Brief explanation of drawings]

FIG. 1(a) is a perspective view showing an embodiment of an insulating device according to the present invention, and FIG. 1(b) is a plan view thereof.

FIG. 2 is a plan view of a motor stator.

FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2;

FIG. 4(a) is a perspective view showing another embodiment of the insulating device according to the present invention, and FIG. 4(b) is a plan view.

FIG. 5 is a side view showing a state in which an insulating sheet is inserted between the main winding and the auxiliary winding of the motor.

FIG. 6(a) is a perspective view showing another embodiment of the insulating device according to the present invention, and FIG. 6(b) is a plan view.

FIG. 7 is a plan view showing another example of the insulating sheet.

[Fig. 8] (a) is a perspective view showing a conventional insulating device, (b)
is also a plan view.

[Fig. 9] (a) is a perspective view showing a conventional insulating device, (b)
is also a plan view.

FIG. 10 (a) is a perspective view showing a conventional insulating device, (b)
) is also a plan view.

[Fig. 11] (a) is a perspective view showing a conventional insulating device, (b)
) is also a plan view.

[Explanation of symbols]

3 Coil end 5 Coil end 7 Coil end 11 Insulation sheet 13 Storage section 15 Connection part 21 Opening 31 Insulation sheet 33 Storage section 35 Opening 41 Insulation sheet 43 Storage department 45 Varnish or resin

Claims (3)

[Claims] 1. An insulating device for a motor winding, in which a connecting portion between a motor winding and a lead wire is housed in a housing made of an insulating sheet, and the housing is fixed to a coil end of the winding. 1. An insulating device for motor windings, characterized in that an opening of the storage section is welded so as to seal the storage section after the connection section is stored. 2. An insulating device for a motor winding, in which a connecting portion between a motor winding and a lead wire is housed in a housing made of an insulating sheet, and the housing is fixed to a coil end of the winding. 1. An insulating device for motor windings, comprising a bending portion that narrows the opening width of an entrance of a storage portion after storing a connection portion. 3. An insulating device for a motor winding, in which a connecting portion between a motor winding and a lead wire is housed in a housing made of an insulating sheet, and this housing is fixed to a coil end of the winding. 1. An insulating device for motor windings, characterized in that varnish or resin is sealed in the storage portion after housing the connection portion.