JPH0814162A - Hermetic compressor - Google Patents

Abstract

PURPOSE:To efficiently prevent stains of an assembly work circumstance of an electric motor part and stains of the electric motor part itself and the inside of a closed case containing it and to efficiently prevent lowering of electric insulation failure detection capacity and refrigerating capacity by giving smoothness to the outer surface of an electric insulation covered layer of a motor winding such as a stator winding, etc., without applying lubricating oil such as refrigerator oil, etc. CONSTITUTION:An electric motor part 31 and a compressor part 32 driven by the electric motor part 31 are built in a closed case 30 containing lubricating oil 57 consisting of ester oil. An electric insulation covered upper layer of a motor winding on the electric motor part 31 is formed of resin containing a self-lubricating material consisting of at least one kind of a particulate body of organic polyethylene, teflon and molybdenum disulfide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor suitable for a refrigerating cycle device such as an air conditioner or a refrigerator, and in particular, does not apply lubricating oil (refrigerating machine oil) to the outer surface of a motor winding. The present invention relates to a hermetic compressor having lubricity.

[0002]

2. Description of the Related Art Conventionally, a hermetic compressor of this type has a hermetically sealed case in which an electric motor unit and a compressor unit driven by the electric motor unit are incorporated together with lubricating oil (refrigerating machine oil), and the refrigerant is compressed by the compressor unit. Is first discharged into the closed case and then discharged to the outside of the closed case through the discharge pipe, while lubricating oil is supplied to the electric motor section and the compressor section.

The stator winding, which is the motor winding of the conventional electric motor section, is coated with refrigerating machine oil on its outer surface before the winding is inserted, and is required in the manufacturing process of the stator winding and the electric motor section assembling process. The smoothness of the outer surface of the winding is secured. For example, in the conventional stator winding 1 shown in FIG. 8 (A), the outer peripheral surface of the core wire 2 is sequentially covered by a lower layer coating 3 and an upper layer coating 4 made of an electrical insulator in this order to electrically insulate the core wire 2. With
Refrigerating machine oil is applied to the entire outer peripheral surface of the upper layer coating 4 to form a refrigerating machine oil coating layer 5 to ensure lubricity.

Further, another stator winding 6 shown in FIG.
The outer peripheral surface of the core wire 2 is sequentially covered with the lower layer coating 7, the intermediate layer coating 8, and the upper layer coating (self-bonding layer) 9, and the refrigerating machine oil coating layer 10 is formed on the outer peripheral surface of the upper layer coating 9.

[0005]

However, in these conventional stator windings 1 and 6, refrigerating machine oil is applied to the outer surface (outermost layer) of the linear electric wires before forming the windings. Therefore, when the winding is made from the state of the electric wire, there is a problem that the fryer of the coil winding machine scatters the refrigerating machine oil from the refrigerating machine oil application layers 5 and 10 to pollute the surroundings.

During assembly of the electric motor unit, dust is likely to adhere to the refrigerating machine oil application layers 5 and 10 of the stator windings 1 and 6, so that the electric motor unit itself after assembly is also soiled. Further, damage to the electric insulating coating layers of the stator windings 1 and 6 caused during assembly of the electric motor portion is covered with the refrigerating machine oil of the refrigerating machine oil application layers 5 and 10 in an electrically insulated state. In the pulse test performed by applying a pulsed high voltage after assembling the parts, it becomes difficult for discharge to occur from the damaged surface. For this reason, the detection of defective electrical insulation of the stator windings 1 and 6 is likely to be overlooked.

Moreover, when ester oil is applied as the refrigerating machine oil to the outer surfaces of the stator windings 1 and 6, since the ester oil has high hygroscopicity, the stator windings 1 and 6 are wound. When the electric motor part is built into the sealed case as it is,
Water will be brought into the closed case. For this reason, water circulates in the refrigeration cycle during the operation of the refrigeration cycle to cause deterioration of the electric insulation of the refrigeration cycle parts and deterioration of the insulating material, and also increases the oligomer extracted from the stator windings 1 and 6. , Deposited and accumulated while circulating the refrigerant,
This narrows the refrigerant flow path of the refrigeration cycle and causes a reduction in refrigeration capacity.

Therefore, the present invention has been made in consideration of such circumstances, and an object thereof is to provide lubricity without applying lubricating oil such as refrigerating machine oil to the outer surface of a motor winding such as a stator winding. By giving it, the dirt of the assembly work environment of the electric motor part and the dirt of the electric motor part itself and the enclosed case containing it can be effectively prevented, and the deterioration of the electric insulation failure detection capacity and the refrigeration capacity can be effectively prevented. It is to provide a hermetic compressor capable of

[0009]

The present invention is configured as follows in order to solve the above-mentioned problems.

The invention according to claim 1 of the present application is a hermetic compressor in which a motor case and a compressor section driven by the motor section are housed in a hermetically sealed case containing a lubricating oil made of ester oil. The outer surface of the electrically insulating coating layer of the motor winding in the electric motor section is formed of a resin containing a self-lubricating material.

Further, the invention according to claim 2 of the present application is characterized in that the self-lubricating material comprises fine particles of an electric insulator having a Vickers hardness of 300 or more.

Further, the invention according to claim 3 of the present application is
The self-lubricating material is characterized by comprising at least one kind of fine particles of organic polyethylene, Teflon, and molybdenum disulfide.

Further, the invention according to claim 4 of the present application is characterized in that the refrigerant compressed by the compressor section in the closed case is hydrofluorocarbon.

[0014]

According to the first aspect of the invention, the outer surface of the electrically insulating coating layer of the motor winding such as the stator winding and the armature winding is formed of the resin containing the self-lubricating material. Lubricity can be provided without applying the lubricating oil of the refrigerating machine oil.

Therefore, when a motor winding is formed by this winding machine and incorporated in the slot of the stator of the electric motor section, the flyer of the winding machine effectively prevents the lubricating oil from being scattered and polluting the surroundings. be able to.

Further, since the outer surface of the motor winding is not coated with the lubricating oil that easily attaches dust, it is effective to clean the electric motor portion itself using this motor winding and the inside of the hermetically sealed case in which it is built. Since it can be prevented and the cleaning can be achieved, clogging of the refrigeration cycle due to dust can be effectively prevented.

Further, since it is possible to effectively prevent the damaged portion of the electric insulation coating layer of the motor winding from being electrically insulated by the lubricating oil, the damage can be prevented during the pulse test of the motor section. Easy to detect.

Further, even when ester oil having a high hygroscopic property is used as the lubricating oil in the compressor, the lubricating oil is not applied to the outer surface of the motor winding, so that the electric insulation is deteriorated by moisture, the insulating material is deteriorated or the oligomer is increased. It is possible to effectively prevent a decrease in the refrigerating capacity due to the above.

Since the outer surface of the electrically insulating coating layer of the motor winding has a lubricity necessary for assembling and manufacturing the electric motor unit, the electric motor unit can be smoothly assembled and manufactured, and the electric property of the motor winding can be improved. It is possible to effectively prevent cracks and the like in the insulating coating layer.

In the second aspect of the invention, the self-lubricating material having a Vickers hardness of 300 or more is used, so that the electric insulating coating layer of the motor winding can be prevented from being damaged.

In the third invention, since the self-lubricating material is fine particles of at least one kind of polyethylene, polytetrafluorothien, and molybdenum disulfide, sufficient lubricity and hardness can be obtained.

In the fourth invention, since the HFC (hydrofluorocarbon) refrigerant is used in the compressors of the first to third inventions, a compressor having a higher reliability without damaging the global environment is provided. it can.

[0023]

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

FIG. 4 and FIG. 5 show a refrigerating cycle of an embodiment in which the present invention is applied to a low temperature refrigerating cycle such as a refrigerator which is a refrigerating cycle device. This refrigeration cycle A
Basically, the hermetic compressor 11, the condenser 12, the pressure reducing device 13, and the evaporator 14 are basically arranged in order in the refrigerant pipe 15
To form a closed refrigerant circulation circuit.

More specifically, as shown in FIG. 5, this refrigeration cycle A includes a hermetic compressor 11, an evaporation pipe 16, a sub-condenser 17, an oil cooler 18, a condenser 19 forming a main condenser 12, and a clean pipe. Two
After being sequentially connected to 0, the dryer 21 is connected to the evaporator 14 via the pressure reducing device 13 such as the capillary tube 22. The evaporator 14 is then passed through an accumulator 23 and a muffler 24, and then a suction pipe 25.
Is connected to the suction side of the hermetic compressor 11 to form a closed refrigeration cycle circuit.

The hermetic compressor 11 compresses the refrigerant for the compressor to a high temperature and high pressure and discharges it to the refrigeration cycle A. The ozone depletion coefficient (ODP) that destroys the ozone layer in the refrigerant for the compressor. Is a CFC refrigerant
%, A HFC (hydrofluorocarbon) refrigerant that is easy to decompose in the atmosphere and is friendly to the global environment is used. A typical example of this HFC refrigerant is a chlorine-free HFC134a (R134a) refrigerant.

The hermetic compressor 11 employing the R134a refrigerant is constructed, for example, as shown in FIG. The hermetic compressor 11 is, for example, a horizontal rotary compressor, and a hermetic case 30 accommodates an electric motor section 31 and a rotary compressor section 32 driven by the electric motor section 31. The closed case 30 is constructed by assembling a case body 30a that can be divided into three parts and cover cases 30b and 30c into a closed structure. However, a closed case structure that can be divided into two from the case body and the cover case may be used.

The electric motor section 31 has a stator (stator) 33 which is press-fitted into the hermetically sealed case 30 and a rotor (rotor) 35 having a rotating shaft 34 mounted thereon. For example, as shown in FIG. 7, the stator 33 covers a stator winding 36, which is a motor winding, with a slot insulating film 37, which is an electrically insulating material, and stores it in the slot groove of the stator core 33a. The coil end portions 38 of 36 are bundled with a binding thread 39 in a ring shape, and the connection terminal 40a is connected to the power supply terminal 41 shown in FIG. The power terminal 41 is attached to the sealed case 30. Electric motor part 31
The motor insulating material is composed of an insulating film 37, a binding thread 39, a lead wire 40, and the like.

The stator winding 36, which is the motor winding,
Is a winding having excellent heat resistance and refrigerant resistance, and an electric wire having excellent mechanical winding resistance and low oligomer extraction rate is used. As shown in FIG. 1, the entire outer peripheral surface of the core wire 62 is covered with the lower layer 63 and the upper layer. The outer peripheral surface of the upper layer 64 is not coated with refrigerating machine oil. The stator winding 36 may be an EAI / self-lubricating material winding, a self-adhesive (fusing) insulating winding containing a self-lubricating material, or the like. EAI /
In the self-lubricating material winding, a resin in which a self-lubricating material and polyesteramide imide (EAI) are mixed is used for the upper layer 64, and an insulating winding coated with polyester amide imide (EAI) resin is used for the lower layer 63. The upper layer 64 is made of polyethylene, PT having a Vickers hardness of 300 or more.
FE (polytetrafluoroethylene) or MoS
_At least one self-lubricating material of ₂ (molybdenum disulfide) is made into a varnish state and polyester amide imide (EA
I) It is formed by mixing and applying to a resin and baking.

In the self-adhesive insulated electric wire 36a containing a self-lubricating material shown in FIG. 2, the upper layer 64a is coated with polyamideimide (AI) and the lower layer 63a is coated with polyesterimide (EI) resin. An adhesive layer 65 containing a self-lubricating material is provided. The adhesive layer 65 includes an epoxy resin, a phenoxy resin, a cross-linking agent mixture, a cross-linking density improver,
Alternatively, a solvent such as cyclohexane or cellosolve is used, and further polyethylene, which is a self-lubricating material, or polytetrafluoroethylene (PTFE), or molybdenum disulfide (MoS ₂ ) is mixed and used.

Furthermore, the stator winding 36b shown in FIG.
As described above, the self-lubricating material may be added to all the coating layers of the upper layer 64b and the lower layer 63b, and further, the stator windings 36, 36a, 36b may be applied to the armature winding.

On the other hand, the rotary shaft 34, which is integrally mounted on the rotor 35, is rotatably supported by the main bearing 44 and the sub bearing 45 of the compressor section 32. The main bearing 44 is attached to a support frame 46 fixedly supported by the closed case 30, while the main bearing 4
4, the cylinder block 47 and the sub-bearing 45 form a cylinder chamber 48 inside, and a piston roller 49 is accommodated in the cylinder chamber 48.

The piston roller 49 is fitted onto the crank portion 34a of the rotary shaft 34 and eccentrically rotates in the cylinder chamber 48 as the rotary shaft 34 rotates. This piston roller 49
On the outer peripheral surface of the blade 51 pressed by the spring 50
Slidably press and contact each other, partitioning the inside of the cylinder chamber 48 into a suction side and a discharge side. As the piston roller 49 rotates, the cylinder chamber 48 passes through the suction pipe 25.
The R134a refrigerant sucked inside is compressed, becomes high temperature and high pressure, and is discharged from the discharge side to the discharge chamber 54 through the discharge port 53. The R134a refrigerant discharged into the discharge chamber 54 is subsequently guided into the sealed case 30, and then sent to the condenser 12 side through a discharge pipe 55 which is a refrigerant pipe.

In the closed case 30, the compressor unit 3
Refrigerating machine oil 57 that lubricates the sliding part of No. 2 is stored,
The refrigerating machine oil 57 is supplied by an oil pump 58 to a sliding portion such as a bearing portion of the rotating shaft 34 via an oil supply pipe 59 to lubricate the sliding portion with oil. The oil pump 58 is provided with the refrigerating machine oil 57 accumulated by the forward / backward movement of the blade 51.
Is sucked into the oil supply pipe 59 and supplied to the lubrication portion.

Refrigerating machine oil 5 stored in the closed case 30
7 is cooled by the oil cooler 18 so as to maintain the lubricating performance of the refrigerating machine oil 57. Oil cooler 1
8 is provided with a heat exchange pipe 60 for cooling the refrigerating machine oil by utilizing a dead space in the closed case 30.

By the way, as the refrigerating machine oil 57 for lubricating the compressor sliding portion of the hermetic rotary compressor 11,
By using the ester-based oil, the heat resistance of the lubricating oil can be improved, and the refrigerating machine oil 57 can be effectively prevented from being deteriorated or carbonized with the help of the cooling action of the oil cooler 18, and the refrigerating machine oil 57 can be effectively prevented. It is possible to reliably prevent the deterioration of the lubricating performance. As a result, the bearing surface of the compressor section 32 and the sliding surface between the piston roller 49 and the blade 51 can be efficiently lubricated, and the reliability of the hermetic compressor 11 can be sufficiently maintained.

Next, the operation of the hermetic compressor 11 and the refrigerating cycle will be described.

By energizing the electric motor section 31 of the hermetic compressor 11, the electric motor section 31 is driven and the rotor 35 is driven to rotate. The rotation shaft 34 rotates integrally with the rotation of the rotor 35, and the crank portion 3 of the rotation shaft 34 rotates.
The piston roller 49 attached to the cylinder 4a
The inside can be eccentrically rotated. As a result, the rotary compression machine 32 is driven.

Due to the eccentric rotation of the piston roller 49, the R134a refrigerant guided to the suction side of the cylinder chamber 48 through the suction pipe 25 is compressed in the cylinder chamber 48 to become a high temperature and high pressure, and from the discharge side to the discharge chamber 54. And then discharged into the closed case 30. The R134a refrigerant discharged into the closed case 30 is then sent to the evaporation pipe 16 of the refrigeration cycle 10 via the discharge pipe 55, and the evaporation water stored in the evaporation dish is evaporated by the evaporation pipe 16.

R in which drain water is evaporated by the evaporation pipe 16
The refrigerant discharged from 134a is subsequently guided to the sub-condenser 17 to radiate heat, cooled, and then guided to the oil cooler 18, where the refrigerating machine oil 5 stored in the closed case 30 is stored.
7 is cooled to prevent this deterioration and maintain the lubricating performance.

The R134a refrigerant discharged from the oil cooler 18 is subsequently sent to the main condenser 12 and radiated by the condenser 19 and the clean pipe 20. The clean pipe 20 is connected in series with the condenser 19 and has a condenser function, and prevents dew condensation on the front surface of the main body due to the temperature difference between the inside of the refrigerator and the room temperature.

The R134a refrigerant passing through the clean pipe 20 is dried by the dryer 21, then guided by the capillary tube 22 which is the decompression device 13, decompressed and adiabatically expanded. The pressure reducing device 13 is a capillary tube 22.
Alternatively, an expansion valve may be used.

R1 decompressed by the capillary tube 22
The 34a refrigerant is subsequently guided to the evaporator 14, where the evaporator 14 removes heat from the surroundings and evaporates it. The R134a refrigerant evaporated in the evaporator 14 is
Gas and liquid are separated by the accumulator 23, and the gas component is guided to the suction pipe 25. The liquid component of the R134a refrigerant is stored in this accumulator 23.

R13 guided by the suction pipe 25
The 4a gas refrigerant is silenced by a muffler 24 provided as needed, then sucked into the suction side of the hermetic compressor 11 and compressed again by the next compressor 11, and is prepared for the next refrigeration cycle A.

When the R134a refrigerant was used as the compressed refrigerant and the ester oil was used as the refrigerating machine oil 57 in the hermetic compressor 11 configured as described above, and the amount of oligomer extracted under the predetermined operating conditions was examined, it was fixed. When the self-lubricating windings 36, 36a, 36b are used as the child windings 36,
It was found that it could be significantly reduced to about 1/5 or less when an experiment was performed by incorporating an EI / AI winding line coated with refrigerating machine oil.

Specifically, from the hermetic compressor 11 to R13
When the discharge temperature of the 4a refrigerant is 130 ° C. to 140 ° C. and the oligomer extraction ratio after operating the hermetic compressor 11 under the same operating conditions for 30 hours is examined, the EI coated with refrigerating machine oil as the motor insulating winding of the electric motor 31 is examined. In the hermetic compressor 11 using the / AI winding, the oligomer extraction rate is 0.8 wt%, while in the self-lubricating material windings 36, 36a and 36b, the oligomer extraction rate is 0.8%.
An oligomer extraction rate of 15 wt% is obtained. In other words, when the self-lubricating windings 36, 36a, 36b having an oligomer extraction rate are used, they are about 1 in the case of the EI / AI winding coated with refrigerating machine oil.
It is / 5. To calculate the amount of oligomer extracted, cyclic oligomers of the oligomers to pentamers were measured by high performance liquid chromatography, quantitative values were measured in wt%, and the measured values were used as initial products (motor insulated windings). It is done by comparing.

Thus, the electric motor 3 of the hermetic compressor 11
When the self-lubricating winding is used for the motor insulation winding of No. 1, the amount of oligomer extracted is significantly reduced to about 1/5 as compared with the conventional motor insulation winding coated with refrigerating machine oil. In addition, the amount of oligomers mixed with the R134a refrigerant and discharged can be greatly reduced.

Since the amount of oligomers discharged into the refrigeration cycle A is reduced, the amount of oligomers precipitated during the refrigeration cycle A, particularly in the low temperature region of the cycle, is also greatly reduced. Therefore,
It is less likely that the precipitated oligomer will be accumulated to reduce the passage area of the refrigeration cycle A, the functional deterioration of the refrigeration cycle A can be effectively prevented, and the reliability becomes high. Since the amount of oligomers discharged or deposited in the refrigeration cycle A can be significantly reduced, R134a can be added to the low temperature refrigeration cycle A.
Even if a refrigerant is used, it can be sufficiently applied and can be applied not only to a high temperature refrigeration cycle such as an air conditioner that cools and heats a room but also to a low temperature refrigeration cycle A.

Further, since the amount of oligomers extracted can be greatly reduced, it is possible to effectively prevent the precipitated oligomers from entering the sliding parts of the compressor and the small clearance parts of the compressing machine, and the sliding parts of the compressor can be effectively prevented. Maintain smooth sliding of
It is possible to avoid a start-up failure of the compressor 11. Also,
Since the oligomers that precipitate can be greatly reduced, the compressor unit 3
Damaged the cylinder coating of No. 2 with the oligomer that deposited,
Since it is possible to prevent refrigerant leakage without galling, it is possible to provide a highly reliable hermetic compressor 11 having a large allowance without lowering the discharge pressure.

Then, the stator windings 36, 36 of this embodiment are
Since a and 36b have lubricity without applying refrigerating machine oil to their outer surfaces, they have the following effects. First, when the stator windings 36, 36a, 36b are made, it is possible to prevent the refrigerator oil from being scattered by the flyer of the winding machine and polluting the surroundings. It is possible to effectively prevent the inside of the closed casing 31 itself and the inside of the closed casing 30 containing the same 31 from being contaminated by dust.

Further, unlike the conventional example, it is almost impossible to cover the insulation damage portion of the stator winding 36 with refrigerating machine oil to electrically insulate it. The detection accuracy of the insulation damage point of 36 is improved.

Furthermore, when a polyhydric ester oil having a high hygroscopic property is applied as a refrigerating machine oil, it is possible to effectively prevent the deterioration of the electrical insulation property due to the oxidation of the refrigeration cycle parts due to the moisture, the deterioration of the insulating material and the increase of oligomers. can do.

Since the outer surface of the electrically insulating coating layer of the motor winding has the lubricity necessary for assembling and manufacturing the motor unit, the motor unit can be smoothly assembled and manufactured, and the electric property of the motor winding can be improved. It is possible to effectively prevent cracks and the like in the insulating coating layer.

In the above embodiment of the present invention, the R134a refrigerant is used as the compressor refrigerant used in the hermetic compressor 11 of the refrigeration cycle A.
Instead of the 34a refrigerant, the following HFC (hydrofluorocarbon) refrigerant may be used. For example, the HFC refrigerant is a single refrigerant such as difluoromethane (R32), pentafluoroethane (R125), 1,1,2,2-tetrafluoroethane (R134), 1,1,2-trifluoroethane (R143), 1 , 1,1-trifluoroethane (R143a), 1,1-difluoroethane (R152
a) and monofluoroethane (R161).

Among these, R134, R134a,
R143 and R143a have a boiling point close to that of the conventional CFC12 (R12) and are preferable as an alternative refrigerant for the low temperature refrigeration cycle.

The HFC refrigerant is not limited to a single refrigerant, but may be a mixture of two or more HFC refrigerants. R125 / R1 as HFC mixed refrigerant
43a / R134a mixed refrigerant, R32 / R134a mixed refrigerant, R32 / R125 mixed refrigerant, R32 / R1
A mixed refrigerant of 25 / R134a is considered.

In the description of the embodiment of the present invention, an example in which the hermetic compressor 11 is a horizontally sealed rotary compressor of the hermetically sealed type is shown. It may be a rotary compressor. Further, instead of the rotary compressor, a scroll or reciprocating type compressor may be used, and the rotary compressor or reciprocating compressor may be a multi-stage compressor or a semi-hermetic type compressor.

Further, although the example of the low temperature refrigeration cycle adopted in the refrigerator is shown in the above-mentioned one embodiment, it can also be applied to the refrigeration cycle adopted in other refrigeration machines such as showcases, and the air conditioning. It can also be applied to high temperature refrigeration cycles such as machines.

[0059]

As described above, according to the first invention of the present application, the outer surface of the electrically insulating coating layer of the motor winding such as the stator winding and the armature winding is formed of the resin containing the self-lubricating material. Therefore, lubricity can be provided without applying lubricating oil of refrigerating machine oil to the outer surface of the motor winding.

Therefore, when the motor winding is assembled into the electric motor part, it is possible to effectively prevent the lubricating oil from being scattered by the flyer of the winding machine to pollute the surroundings.

Further, since the outer surface of the motor winding is not coated with the lubricating oil that easily adheres to the dust, the electric motor itself using this motor winding can be effectively prevented from being soiled and cleaned. Therefore, clogging of the refrigeration cycle due to dust can be effectively prevented.

Further, since it is possible to effectively prevent the electrically insulating damaged portion of the motor winding from being electrically insulated by the lubricating oil, it is easy to detect the damage in the pulse test.

Moreover, since the lubricating oil is not applied to the outer surface of the motor winding, the electrical insulating property is deteriorated by the moisture generated when the lubricating oil is ester oil having high hygroscopicity, and the insulating material is deteriorated or the oligomer is increased. It is possible to effectively prevent deterioration of the refrigerating capacity.

Since the outer surface of the electrically insulating coating layer of the motor winding has a lubricity necessary for assembling and manufacturing the electric motor unit, the electric motor unit can be smoothly assembled and manufactured, and the electric property of the motor winding can be improved. It is possible to effectively prevent cracks and the like in the insulating coating layer.

In the second aspect of the invention, the self-lubricating material having a Vickers hardness of 300 or more is used, so that the electric insulating coating layer of the motor winding can be prevented from being damaged.

In the third aspect of the invention, since the self-lubricating material is fine particles of at least one kind of polyethylene, polytetrafluorothien, and molybdenum disulfide, sufficient lubricity and hardness can be obtained.

In the fourth invention, since the HFC (hydrofluorocarbon) refrigerant is used in the compressors of the first to third inventions, the compressor which is further reliable without damaging the global environment is provided. it can.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of a hermetic compressor according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of another embodiment of the hermetic compressor according to the present invention.

FIG. 3 is a longitudinal sectional view of a main part of an embodiment of a hermetic compressor according to the present invention.

FIG. 4 is a refrigeration cycle diagram of any of the embodiments shown in FIGS. 1 to 3.

FIG. 5 is a more detailed refrigeration cycle diagram of any of the embodiments shown in FIGS.

FIG. 6 is a vertical sectional view of an example of the hermetic compressor shown in FIGS. 4 and 5.

7 is a perspective view of a stator of an electric motor section of the hermetic compressor shown in FIG.

8A and 8B are vertical cross-sectional views of a stator winding of a conventional electric motor unit.

[Explanation of symbols]

 11 Hermetic compressor 31 Electric motor part 33 Stator 35 Rotor 36, 36a, 36b Stator winding 62 Core body 63, 63a, 63b Lower layer 64, 64a, 64b Upper layer containing self-lubricating material

Claims (4)

[Claims] 1. A hermetic compressor in which a motor section and a compressor section driven by the motor section are housed in a hermetically sealed case containing a lubricating oil made of ester oil. The outer surface of the electrical insulation coating layer,
A hermetic compressor formed of a resin containing a self-lubricating material. 2. The self-lubricating material has a Vickers hardness of 300.
The hermetic compressor according to claim 1, wherein the hermetic compressor is made of fine particles of the electrical insulator. 3. The self-lubricating material is organic polyethylene,
The hermetic compressor according to claim 1 or 2, comprising at least one kind of fine particles of polytetrafluoroethylene and molybdenum disulfide. 4. The hermetic compressor according to claim 1, wherein the refrigerant compressed in the compressor section in the hermetic case is hydrofluorocarbon.