JPH0676796B2 - Refrigerant compressor - Google Patents

Description

The present invention relates to a refrigerant compressor incorporated in, for example, an air conditioner, a refrigerator, or the like, and particularly to an electrical insulation method that operates at a high temperature. The present invention relates to a "F class" specification heat-resistant refrigerant compressor.

(Prior Art) As shown in FIG. 4, the already proposed refrigerant compressor is provided with a motor 4 composed of a stator 2 and a rotor 3 in a case body 1 which is hermetically sealed. The compression device 5 is provided in the lower part, the accumulator 7 is attached to the supply pipe 6 of the compression device 5, and the discharge pipe 8 is provided in the upper part of the case body 1.

In particular, since the motor insulating film used for the motor 4 uses polyethylene terephthalate (PET), it deteriorates with time in the refrigerant Freon and lubricating oil at a temperature of about 120 ° C or higher. And physical properties such as mechanical strength are extremely deteriorated and become brittle. If fragments or the like generated thereby enter the compression device 5, locking may occur, or cracks may occur, which may reduce the insulation.

As described above, since PET is used for the insulating film used in the motor 4 described above, the heat-resistant usage limit is "E class" (120 ° C) and "B class" according to the provisions of the "electrical insulation method". Limited to (130 ℃).

Therefore, in the above-mentioned refrigerant compressor, for example, a cooling fan or a cooling means by liquid injection is adopted so that the temperature during operation does not exceed the upper limit temperature of the motor insulating film.

However, these cooling means have a drawback that the structure must be complicated because a refrigerant pipe and a new cooling mechanism must be incorporated.

For this reason, speeding up of the refrigerant compressor and high temperature operation (specification)
With the above demand, it is desired to improve the heat resistance of the motor insulating film due to the high temperature.

On the other hand, in assembling the refrigerant compressor, it is necessary to incorporate the motor insulating film with an automatic insertion device.

Insulating film composed of polyphenylene sulfide (PPS) is a heat-resistant material of "F class" (155 ° C), it does not dissolve in refrigerant or lubricating oil, and it may damage mechanical strength and insulation. However, the insulating film of a refrigerant compressor actually operated at a high temperature has obtained good results, but the tear strength and the like are low, and cracks or the like may occur at the ends during automatic insertion.

(Problems to be Solved by the Invention) The present invention has been made in view of the fact that the conventional motor insulating film has a low heat-resistant use limit and a low tear strength, and a good insertion can be achieved by an automatic insertion device. To provide a refrigerant compressor using a motor insulating film which has a tear strength as much as possible and has heat resistance that does not hinder the refrigerant compressor even when it is continuously operated in a high temperature state. With the goal.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a refrigerant compressor in which a compressor and a motor are built in a case body, in which a motor insulating film is made of polyphenylene sulfide. (PP
S) film and a composite film of a thermoplastic or thermosetting resin film having a tear strength higher than that of the PPS film, and particularly, as the composite film, the PPS film and polyethylene terephthalate The present invention includes those characterized by using a composite film in which a (PET) film is compounded, and further includes those characterized by using a PPS film obtained by removing an oligomer with an organic solvent or the like as the PPS film.

(Operation) According to the present invention, a PPS film and a thermoplastic or thermosetting resin film having a tear strength equal to or higher than that of the PPS film are combined as a motor insulating film of a refrigerant compressor by the above-mentioned means, so that "F type" ( It has a heat resistance of 155 ° C), does not dissolve in a refrigerant or lubricating oil, and does not impair mechanical strength and insulation. Therefore, a cooling device such as a cooling fan becomes unnecessary. Further, it has a tear strength and the like that can be properly inserted by an automatic insertion device.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

In addition, in the present embodiment, the same components as those in FIG.

In the present embodiment, a third part of FIG.
As shown in FIG. (C), a PPS film is used for the first insulating layer A1 and the third insulating layer A3, and a PET film is used for the second insulating layer A2. An example will be described.

In FIGS. 1 to 3, reference numeral 1 is a sealed case body, and a stator 2 is provided in the case body 1.
A motor 4 including the rotor 3 and the rotor 3 is provided, and a compression device (see 5 in FIG. 4) is provided below the motor 4. Further, a large number of slots 9 are formed in the inner peripheral edge of the stator 2 in the axial direction, and in each of the slots 9, as shown in FIG. 3 (a),
A slot insulating film 10 composed of the composite insulating film A is inserted. Further, a coil 11 is provided in the slot insulating film 10, and the coil 11 is
As shown in FIG. 3 (b), the composite insulating film A is inserted into the opening 10a of the slot insulating film 10 in which the
A wedge insulating film 12 composed of is provided. The slot insulation film 10 and the wedge insulation film 12 constitute a motor insulation film.

The composite insulating film A used here has the following advantages in particular.

(1) Second insulating layer positioned at the center during automatic insertion
Since the PET film of A2 has a tear strength and the like required for automatic insertion, the low tear strength and the like of the PPS film that serves as an effective insulating layer is buffered and reinforced.

(2) When operating at high temperature, even if the PET film is used at a temperature above the maximum usable temperature, in this example both sides are covered with PPS film, so the mechanical strength and insulation of the PET film The deterioration of the conductivity is caused by the first and third insulating layers A1 and A3
Is supplemented with PPS film located at.

The above advantages may be satisfied not only with a three-layer structure like the composite insulating film A but also with a composite insulating film having a structure of two layers or four or more layers in some cases.

When the composite insulation film A having a PET film as the second insulation layer A2 was used, the heat resistance and the like in the high pressure refrigerant and the lubricating oil were evaluated, and as a result, as shown in Table 1 and FIG. I got the result. The numerical values in Table 1 are 1 for PET film. FIG. 5 shows the change over time in tensile strength at 175 ° C.

When the bonding method is used as a method for compounding the composite insulating film, a polyurethane-based, epoxy-based, amideimide-based, imide-based, or other adhesive can be used. In this case, it is effective to perform a chemical or physical treatment such as roughening the adhesive surface for adhesion in order to improve the adhesive effect.

A heat fusion method (high-frequency wave, ultrasonic wave, etc.) can also be used as a method for compounding the composite insulating film.

[Effects of the Invention] As described above, according to the present invention, by using a PPS film as an effective insulating layer and having a mechanical strength that makes the automatic insertion state good at the time of assembling the refrigerant compressor, Since it is possible to improve the performance and to eliminate the need for a cooling device such as a cooling fan, the refrigerant compressor can be provided at a low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is an exploded cross-sectional view showing an example of a motor of a refrigerant compressor according to the present invention, and FIGS. 3 (a), (b), (c). Is a perspective view of a motor insulating film according to the present invention, FIG. 4 is a cross-sectional view of a refrigerant compressor already proposed, and FIG. 5 compares an example of heat resistance test results of the motor insulating film according to the present invention with a conventional one. FIG. 1 ... Case body, 2 ... Stator, 3 ... Rotor, 4
...... Motor, 5 ...... Compressor, 9 ...... Slot, 10 ......
Slot insulation film, 11 …… Coil, 12 …… Wedge insulation film.

Claims (3)

[Claims] 1. A refrigerant compressor in which a compressor and a motor are built in a case body, wherein a motor insulating film is a polyphenylene sulfide (hereinafter referred to as PPS) film and a thermoplastic or thermal resin having a tear strength equal to or higher than the PPS film. A refrigerant compressor formed of a composite film in which a curable resin film is composited. 2. The refrigerant compressor according to claim 1, wherein a composite film in which a PPS film and a polyethylene terephthalate (hereinafter referred to as PET) film are composite is used as the composite film. 3. The refrigerant compressor according to claim 1, wherein the PPS film is a PPS film from which oligomers have been removed by using an organic solvent or the like.