CN1197188A - Refrigerant compressor - Google Patents

Abstract

A refrigerant compressor is composed of compressing mechanism and electric motor, which are held in an enclosed container, and features that inside and outside insulating films with different dielectric constants are inserted into multiple slots formed axially at internal periphery of motor stator, resulting in higher efficiency of motor and high static capacitance to ground, which does not affect the compressor.

Description

Coolant compressor

For example interior coolant compressor such as air-conditioner, refrigerator the present invention relates to pack into.

Traditional coolant compressor is shown in Figure 3 as described later, the motor 4 that is made of stator 2 and rotor 3 is set in closed container 1, compression set 5 is set below this motor 4, on the suction line 6 of this compression set 5, accumulator 7 is set, discharge pipe 8 is set on the top of closed container 1.

Because energy-conservationization requirement for the coolant compressor in such pack into air-conditioner or the refrigerator, does one's utmost to require to improve the efficient of compressor, therefore, when requiring to improve compression mechanical part efficient, motor efficiency is improved recently.

If will improve motor efficiency, major measure be increase stator and the folded thick of rotor or change winding data (increase coil amount) yet, difficulty is if above-mentioned both is increased, and causes leakage current increase in air-conditioner or the refrigerator because of the static capacity over the ground that makes motor increases.Known, reduce compressor static capacity over the ground, the static capacity that just reduces motor can reduce leakage current effectively, yet, reduce folded thick or reduce copper consumption, certainly will sacrifice efficient, and the hope giving up raising the efficiency of having to.

In order to reduce motor static capacity over the ground, as long as what play a major role is will reduce the surface area of embedded coil surface area or groove or make the thickness of slot insulation film thicken or make multiplet etc. to make the insulating properties of groove improve just passable.

Above-mentioned motor 4 employed insulation films, consider from overall characteristics such as insulating properties, durability, mechanical strength and costs, usually use polyethylene terephthalate (to call PET in the following text), in the occasion that reaches high efficiency by change stator winding specification (increasing the coil amount), be to reduce ground capacitance, correspondingly always take to make the slot insulation film thickness to thicken or constitute the measure of dual structure.But, just because of the result who does has like this limited coil amount in can insertion groove, so, also make effect reach the limit because of the reduction static capacity of slot insulation film thickness or multiplet generation along with motor efficiency is improved.

On the other hand, when low poly-naphthalenedicarboxylic acid ethyl ester (to call PEN in the following text) of dielectric constant etc. is used as coolant compressor slot insulation film, these materials are stability in cold-producing medium or lubricating oil, and can obtain good result aspect the minimizing ground capacitance, yet, on mechanical performance, low because of its tearing strength especially, starting coil when slit is embedded in, can produce the crack in slot insulation film end, the coil that embeds is subsequently exposed, thereby make the insulating properties of stator, rotor core impaired.

Therefore, the problem that is difficult to make the ground capacitance minimizing in view of the motor slot insulation film of tradition use, the object of the invention is to provide the coolant compressor with slot insulation membrane structure as described below, and the static capacity that this slot insulation structure can be reached when motor efficiency is improved is not to producing obstruction as coolant compressor.

Be the coolant compressor of the present invention that achieves the above object, system is made up of the compressing mechanism and the motor that are contained in the closed container, its characteristics are, described motor slot insulation film is constituted dual structure, and constitute with the mutually different resin film of dielectric constant, use PET, another side to use PEN in the one side of described slot insulation film.

Owing to adopt said structure can not make motor efficiency, reliability reduce, guarantee coolant compressor is not produced the static capacity over the ground of obstruction again, thereby provide that leakage current is few, working stability and the low coolant compressor of cost.In addition, owing to can make the motor ground capacitance reduce, also can make the coil amount in the insertion groove to increase, has more high efficiency coolant compressor thereby can provide.

Simple declaration to accompanying drawing.

Fig. 1 is the drawing in side sectional elevation of expression one embodiment of the invention,

Fig. 2 is the amplification drawing in side sectional elevation of expression coolant compressor Stator Slots of the present invention,

Fig. 3 is the profilograph of expression conventional refrigerants compressor.

Below, with reference to accompanying drawing one embodiment of the invention is described.In this enforcement, adopt same label to describe with member identical among Fig. 3.

In the present embodiment, to inner side slot insulation film 10A use PEN as shown in Figure 2, outer side slot insulation film 10B uses the example of PET to describe.

In Fig. 1, Fig. 2,1 is closed container.The motor 4 that is made of stator 2 and rotor 3 is arranged on the inside of this closed container 1.Compression set 5 (with reference to Fig. 3) is arranged on the bottom of this motor.In addition, along the inner peripheral of stator 2 and extend to form many grooves 9 vertically.

As shown in Figure 2, slot insulation film 10 laminations that insulation film 10B outside inboard insulation film 10A of the groove that is made of the mutually different material of dielectric constant and the groove is formed insert in each groove 9, coil 11 is arranged in this slot insulation film 10, for example, at 3 phases, 4 pole motors as shown in the figure, occasion with 24 grooves 9 is in 4 groups of grooves 9 of coil 11 configurations.And, in a side of the rotor 3 of coil 11 wedge shape insulation film 12 is set.

In addition, before coil 11 is set, in slot insulation film 10A, 10B insertion groove 9.

Have characteristic as shown in table 1 owing to be used for the PEN of the inboard insulation film 10A of groove, its dielectric constant is compared low with the PET that is used for groove outside insulation film 10B, so the static capacity over the ground that lowers motor is worked.In addition, because the ceiling temperature that allows when using continuously is also than PET height, thereby hear resistance, reliability are improved.

In addition, as shown in Figure 2, owing to the slot insulation film is in the bending insertion groove,, also must has tearing strength for guaranteeing insulating properties, yet, as present embodiment, use dual structure that PEN constitutes as the slot insulation film, when the PEN that tearing strength is low inserts by will simultaneously using PET, another side, even just in case produce when tearing owing to rely on PET can guarantee insulating properties, thereby can guarantee reliability.Table 1

		???PEN25μm	????PET25μm
				Dielectric constant (25 ℃)	????60Hz	????3.0	????3.2
????1KHz	????2.9	????3.1
			????1GHz		????2.9	????3.0
Allow the temperature of use continuously	Machine performance	????160℃					????105℃
			The state of electricity	????180℃	????105℃

Claims (2)

1. coolant compressor, it is made up of the compressing mechanism and the motor that are contained in the closed container, it is characterized in that the dual structure that the slot insulation film system of described motor is made of the mutually different resin film of dielectric constant.

2. compressor according to claim 1 is characterized in that, the one side of described slot insulation film is used polyethylene terephthalate, and its another side uses poly-naphthalenedicarboxylic acid ethyl ester.

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