JPH05195974A - Closed type horizontal type rotary compressor - Google Patents

Abstract

PURPOSE:To prevent environmental pollution by using fluorocarbon as refrigerant and alkylbenzene oil of specified viscosity at specific temperature as refrigerator oil in a closed type horizontal rotary compressor for refrigerating and air-conditioning equipment of the specified evaporating temperature or lower, and providing a bearing with an injection hole to inject liquid refrigerant into a cylinder. CONSTITUTION:An injection hole 22 connected to a liquid refrigerant suction pipe 21 is provided at the wall surface of a cylinder chamber 10a. This injection hole 22 is provided in one bearing 6, and a liquid refrigerant passage 22a communicated with the cylinder chamber l0a is branched from around the terminal of a refrigerant passage 22b. Refrigerant gas moving up by the rotation of a rotor 6 is thereby cooled by liquid refrigerant jetted from the injection hole 22. Alkylbenzene oil of 50-65cSt in viscosity at 40 deg.C and 5.5-6.5cSt in viscosity at 100 deg.C is used as refrigerator oil. The lowering of two-phase separating temperature of fluorocarbon (Freon) 22 is thus performed to prevent an oil shortage phenomenon at the evaporating temperature of 10 deg.C or lower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an electric motor and a compressor section connected by a rotary shaft in a substantially horizontal arrangement in a closed container, and in particular, makes it possible to reduce the amount of restricted CFC refrigerant used. The present invention relates to a hermetic horizontal rotary compressor.

[0002]

2. Description of the Related Art Conventionally, compressors for refrigerating and air-conditioning equipment have been vertical and tall. An example thereof will be described with reference to FIG. This compressor is a hermetic reciprocating compressor, and an electric motor 2 and a compressor section 41 are vertically arranged in a hermetic container 1. The upright rotating shaft 5 is supported by bearings 6 and 7, the upper part of the bearing 7 is press-fitted into the rotor of the electric motor 2, and an eccentric portion (not shown) is provided between the bearings 6 and 7. The eccentric portion operates the compressor unit 41. The compressor portion 41 mainly includes a piston 41a and a cylinder chamber 41b, and the piston 41a reciprocates in the horizontal direction by the rotation of the eccentric portion of the rotary shaft 5. A gaseous refrigerant from an evaporator (not shown) is supplied into the cylinder chamber 41b, compressed by the piston 41a to become compressed gas, and discharged to the outside.

At the bottom of the closed container 1, there is a refrigerator oil 4
2 is stored and when the rotary shaft 5 rotates, the refrigerating machine oil 42 rises in the oil supply hole (not shown) formed in the center of the rotary shaft 5, and the bearings 5, 6 and the rotary shaft 5 The refrigerating machine oil 42 is supplied to the sliding surface and the sliding surface between the piston 41a and the cylinder chamber 41b. An escape hole (not shown) is provided in the upper part of the rotary shaft 5, and the refrigerating machine oil in the rotary shaft 5 goes out through the escape hole and falls into the space in the hermetic container 1 to close the seal. Return to the bottom of container 1.

As shown in FIG. 15, a hermetically sealed small refrigerator having an evaporation temperature of 10 ° C. or lower using such a compressor has a substrate 3
Compressor 30 ', condenser 23', power source 3 on 6 '
4, an evaporator 27, a fan 35, etc. are mounted, and these constitute the refrigeration cycle shown in FIG. That is, FIG.
The compressed gas of the high-temperature and high-pressure refrigerant output from the compressor 30 ′ shown in FIG. 4 radiates heat in the condenser 23 ′, is cooled to liquefy, and is supplied to the liquid receiver 25 ′ via the dryer 24. Although the refrigerant supplied to the liquid receiver 25 'is liquefied, a gaseous refrigerant also exists, and in the liquid receiver 25',
The refrigerant is separated into gas and liquid, and only the liquid refrigerant is output. This liquid refrigerant is decompressed by the expansion valve 26 and supplied to the evaporator 27. In the evaporator 27, the liquid refrigerant absorbs heat in the space in which the hermetically-sealed small refrigerator is installed and is vaporized, and becomes a high-temperature refrigerant in the gaseous state through the check valve 28 and the accumulator 29 to the compressor. 30 '. Electric motor 2 of compressor 30 '
When (FIG. 14) rotates, the refrigerant flows through the above refrigeration cycle, and the evaporator 27 absorbs the heat of the space and the condenser 23
The heat is dissipated in ‘and the temperature of the space is lowered.

Such a closed type small refrigerator is used in various places for commercial use. When it is used in a showcase, for example, as shown in FIG. 17, inside a machine room 43 provided at the bottom of the showcase 41. A closed compact refrigerator is installed.

On the other hand, as the refrigerant for the closed type small refrigerator,
Conventionally, Freon 12 has been used. However,
In recent years, chlorine-based CFCs have been subject to use restrictions due to the problem of global environmental pollution, particularly ozone layer depletion. CFCs subject to the regulations are CFCs 11, CFCs 12,
Freon 113, Freon 114, Freon 115, etc., which have been used in the refrigeration cycle of refrigeration equipment such as a refrigerator and freezer, have a high ozone depletion coefficient,
Since it is one of the factors that cause environmental damage, it is subject to usage regulations.

Therefore, a refrigerant that replaces the Freon 12 is required, and recently, the ozone depletion coefficient is low and the Freon 1
Freon 22 having a fracture coefficient of about 0.05 when 2 is set to 1 is likely to be adopted.

[0008]

By the way, when Freon 22 is used as a refrigerant in the hermetic reciprocating compressor shown in FIG. 14, in the low temperature region where the evaporation temperature is 10 ° C. or less, which is the field of freezing and refrigeration, compression is performed. The temperature of the compressed gas of the freon 22 from the machine 30 'is much higher than that of the freon 12, so that the sliding parts such as the bearings in the compressor 30' are heated and wear causes galling. Accidents such as seizure are likely to occur, and the characteristics of the lubricating oil are deteriorated such that the refrigerating machine oil is carbonized by the high-temperature compressed gas in the compressor 30 ', etc., and the bearing etc. in the compressor 30' is deteriorated. The wear of the sliding parts will further increase.

As one method for solving this problem, there is a method of injecting a liquid refrigerant (liquid refrigerant) into the cylinder chamber 41b. Since the liquid refrigerant has a low temperature, by supplying it to the cylinder chamber 41b, the heat of the high temperature gaseous refrigerant can be absorbed and the temperature of the refrigerant can be lowered. Such cooling of the refrigerant is called liquid injection cooling.

However, the hermetic reciprocating compressor as shown in FIG. 14 has a structure unsuitable for enabling such liquid injection cooling. Also,
Liquid injection cooling is possible in a hermetic rotary compressor, but the mainstream of a hermetic rotary compressor used for air conditioning equipment is a vertical type, and no consideration is given to a horizontal type.

Conventionally, a naphthenic refrigerating machine oil, for example, Suniso 4GSD (trade name) manufactured by Nippon San Oil Co., Ltd., is used as refrigerating machine oil for improving lubrication of bearings in a compressor. .. When such refrigerating machine oil is used together with Freon 22 as a refrigerant, the two-layer separation temperature of these refrigerants is higher than that of Freon 12, so that the refrigerant 23 'in FIG. 27
When it is sent to, the refrigerant and the refrigerating machine oil are separated from each other, and the refrigerating machine oil remains in the evaporator 27 and returns to the compressor 30 ′ in a small amount. For this reason, the refrigerating machine oil cannot be used effectively and must be constantly replenished.

Further, as shown in FIG. 20, a winding wire 47 is wound around the stator 46 of the electric motor 2 in FIG. 14, and between the stator 46 and the winding wire 47, they are electrically connected. An insulating film 48 is provided to insulate the coil 47. However, when the CFC 22 is used as the refrigerant as described above, compared with the case where the CFC 12 is used, the winding 47 and the insulating film 48 are made of an organic substance. The amount of generation of a certain oligomer increases. This oligomer dissolves in the refrigerant or the refrigerating machine oil and circulates in the refrigerating cycle, and tends to accumulate in a crystalline form at a low temperature such as the suction port of the compressor section 41. Therefore, the rotation of the rotary shaft 5 and the reciprocating motion of the piston may be delayed, resulting in a poor compression state.

Further, the evaporating temperature is 1 using CFC 22 as a refrigerant.
When used in a low temperature range of 0 ° C. or lower, the discharge pressure becomes high and the surface pressure applied to the rotary shaft becomes large. In addition, since the temperature of the discharge gas is high as described above, the refrigerating machine oil deteriorates.
As a result, the amount of wear of the sliding portion may be further increased, and an accident such as galling or seizure due to abrasion powder may occur.

A compressor 30 'is used in a closed type compact refrigerator for business use having an evaporation temperature of 10 ° C. or less as shown in FIG.
Conventionally, since the vertical compressor as shown in FIG. 14 has been used, its height is high. Such a vertical compressor has a height of 2 mm as shown in FIG.
When the closed compact refrigerator using the compressor having a size of 70 mm or more is installed in the showcase 41 as shown in FIG. 17, a lower portion of about 30 cm becomes a machine room in which the refrigerator is installed. .. This is a considerable part, and the space 45 in which the food is placed is restricted accordingly.

The liquid receiver 25 'in the refrigerating cycle shown in FIG. 16 has a tank shape with a constant cross-sectional shape, as shown in FIG.
The pipe 37 into which the liquid refrigerant from (FIG. 16) is fed is
Pipe 3 for placing liquid refrigerant in expansion valve 26 (FIG. 16) at the bottom
8 are attached respectively. In the liquid receiver 25 ′, the liquid refrigerant is present in the lower part and the gaseous refrigerant is present in the upper part, and the liquid refrigerant in the lower part is sent out from the pipe 38 by the pressure of the refrigerant itself. In this case, unnecessary substances such as dust collect on the bottom of the liquid receiver 25 ', and in order to avoid this, the tip of the pipe 38 is slightly separated from the bottom surface of the liquid receiver 25'. However, in this case, the refrigerating machine oil also accumulates from the tip to the lower part of the pipe 38, and a considerable amount of refrigerating machine oil does not collect and return to the compressor 30 '.

It is an object of the present invention to solve the problems caused by using Freon 22 as a refrigerant and to provide a highly reliable hermetic horizontal rotary compressor.

[0017]

In order to achieve the above object, a hermetic horizontal rotary compressor according to the present invention has a viscosity of 50.
-65 cst, viscosity at 100 ° C 5.5-6.5 c
The alkylbenzene oil of st is used as the refrigerating machine oil, and the bearing is provided with an injection hole for injecting the liquid refrigerant into the cylinder.

In the hermetic horizontal rotary compressor according to the present invention, the winding wire of the stator of the electric motor is coated with the first polymer material having a glass transition temperature of 190 to 200 ° C.
Further, the film of the first polymer material has a glass transition temperature of 25.
The film is coated with a second polymer material at 0 to 300 ° C., and the insulating film of the electric motor is a polyethylene terephthalate film.

Further, in the hermetic horizontal rotary compressor according to the present invention, the rotary shaft having the eccentric part for eccentricizing the roller in the cylinder chamber of the compressor part is immersed in the surface having a surface roughness of 1.2 μm or less. A coating with a surface roughness of 4.2 μm or less is formed by sulphonitriding, and the clearance with the bearing is 4
˜27 μm, the clearance between the eccentric part and the roller is 8 to 32 μm, and the vane for supplying the refrigerating machine oil to each part has a surface roughness by sulphonitriding treatment on its surface. The coating has a thickness of 4.2 μm or less, and the clearance with the groove of the cylinder is 18 to 28 μm.
m and the roller is made of monichrome alloy cast iron.

Furthermore, in the hermetic horizontal rotary compressor according to the present invention, a vane chamber hermetically formed behind the vane is provided, and the bottom of the hermetic container is provided in the vane chamber. Oil passage for communicating refrigerating machine oil to the bearing portion of the compression mechanism, and the oil reservoir communicating with the oil supply hole of the rotary shaft at the outlet of the oil supply passage. Set up a section.

Furthermore, in the hermetic horizontal rotary compressor according to the present invention, the injection hole has a first liquid refrigerant passage having an end portion in the bearing, and a first liquid refrigerant passage of the first liquid refrigerant passage. The second liquid refrigerant passage has a smaller diameter than the first liquid refrigerant passage having one end opened near the end and the other end opened in the cylinder chamber.

[0022]

In the hermetic horizontal rotary compressor according to the present invention, when an alkylbenzene oil having a viscosity of 50 to 65 cst at 40 ° C. and a viscosity of 5.5 to 6.5 cst at 100 ° C. is used as a refrigerating machine oil, it serves as a refrigerant. For Freon 22 of
The bilayer separation temperature becomes low. As a result, the evaporation temperature is 10 ℃
The oil rising phenomenon in the following low temperature range is prevented. Further, when the liquid refrigerant is injected from the injection hole into the cylinder chamber, the liquid refrigerant has a low temperature, so that the heat of the gaseous refrigerant is absorbed and vaporized in the cylinder chamber, whereby the temperature of the compressed gas is lowered. Therefore, it is possible to lower the temperature at each sliding part, suppress these abrasions, suppress the deterioration of the characteristics of the refrigerating machine oil, prevent accidents such as galling and seizure, and improve reliability. To do.

In the hermetic horizontal rotary compressor according to the present invention, the winding wire of the stator of the electric motor has the core wire coated with the first polymer material having a glass transition temperature of 190 to 200 ° C. Glass transition temperature 250-300
Since it is coated with the second polymer material at a temperature of ℃, it is possible to prevent the generation of oligomers from this winding. In this case, the coating film made of the first polymer material mainly secures the insulation between the windings, may be one that generates an oligomer, and an inexpensive one can be used. On the other hand, the film formed of the second polymer material does not generate oligomers. This is generally expensive, but since the insulation between the windings is secured by the coating of the first polymeric material, the amount used should be smaller than that of the coating of the first polymeric material. You can Further, since the polyethylene terephthalate film is used as the insulating film of the electric motor, no oligomer is generated from the insulating film. Therefore, the amount of the oligomer that dissolves in the refrigerant and the refrigerating machine oil from the winding wire and the insulating film is reduced, and the oligomer is accumulated in the suction port of the compressor section, so that the compression operation is not hindered.

Further, in the hermetic horizontal rotary compressor according to the present invention, a film is formed on the surfaces of the rotary shaft and the vane by the sulphidizing and nitriding treatment, and the roller is made of monichrome alloy cast iron. Further, the abrasion resistance of the sliding portion is enhanced, and accidents such as galling and seizure can be prevented, and reliability is enhanced. In addition, the clearance between the rotary shaft and the bearing is 4 to
27 μm, the clearance between the eccentric part of the rotary shaft and the roller is 8 to 32 μm, and the clearance between the vane and the groove of the cylinder is 18 to 28 μm, so that the variation of the clearance can be suppressed and the clearance is reduced. As a result, it is possible to prevent the temperature of the sliding portion from rising and the vibration caused by the increase in the clearance.

Further, in the hermetic horizontal rotary compressor according to the present invention, the vane chamber hermetically formed at the rear of the vane has a communicating hole communicating with the lubricating oil reservoir at the bottom of the hermetic container. Since the oil supply passage for supplying the refrigerating machine oil is provided in the bearing portion of the compression mechanism portion and the oil sump portion communicating with the oil supply hole of the rotation shaft is provided at the outlet of the oil supply passage, the rotary shaft of the compressor portion is provided. The oil is reliably supplied to the sliding portion when the is arranged so as to be substantially horizontal, and the reliability is improved.

Furthermore, in the hermetic horizontal rotary compressor according to the present invention, the injection hole includes a first liquid refrigerant passage having an end portion in the bearing, and the end of the first liquid refrigerant passage. Since the second liquid refrigerant passage has a smaller diameter than the first liquid refrigerant passage having one end opened in the vicinity of the portion and the other end opened in the cylinder chamber, the liquid refrigerant injected from the injection hole into the cylinder chamber is It is sprayed in the form of fine mist, which effectively lowers the temperature of the compressed gas.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the overall construction of an embodiment of a hermetic horizontal rotary compressor according to the present invention, in which 1 is a hermetic container,
2 is an electric motor, 3 is a rotor, 4 is a stator, 5a is an escape hole,
5 is a rotary shaft, 6 and 7 are bearings, 8 is a compressor part, 9 is a roller, 10 is a cylinder, 10a is a cylinder chamber, 11 is a vane, 12 is refrigerating machine oil, 13 is an eccentric part, 14 is a discharge pipe, 15 is a A spring, 16 is an oil supply pipe, and 17 is an oil sump.

In FIG. 1, the closed container 1 has a cylindrical shape with a central axis in the lateral direction, and a rotary shaft 5 is laterally supported therein by bearings 6 and 7. One end of the rotary shaft 5 is press-fitted into the rotor 3 of the electric motor 2, and the eccentric portion 13 is provided near the other end. The electric motor 2 is composed of the rotor 3 and the stator 4, and the stator 4 is outside the rotor 3 and fixed to the inner surface of the closed container 1.

The compressor section 8 is a cylinder chamber 1 of a cylinder 10.
This cylinder 9 consists of a roller 9 that rotates in 0a.
The eccentric portion 13 of the rotary shaft 5 is fitted into the shaft 5, and the eccentric portion 13 rotates eccentrically as the eccentric portion 13 rotates. This cylinder chamber 1
Refrigerant gas is sent from an evaporator (not shown) into 0a, and the roller 9 is compressed by eccentric rotation.
The compressed gas is discharged from the cylinder chamber 10a into the closed container 1, and is sent from the discharge pipe 14 to the condenser (not shown) through the closed container 1.

A vane 11 is provided in the compressor section 8 and is pressed against the surface of the roller 9 by a spring 15. The rotation of the roller 9 causes the vane 11 to reciprocate up and down on the paper surface, which causes the refrigerating machine oil 12 to be fed into the oil sump portion 17 via the oil supply pipe 16 and further provided along the central axis of the rotating shaft 5. Oil supply hole (not shown)
Sent to. Bearings 6 and 7 of this rotating shaft 5 and rollers 9
The oil hole 5 that reaches this oil supply hole in the part facing the inner surface of the
a is provided, and the refrigerating machine oil sent through the oil supply hole is pushed out to the inner surfaces of the bearings 6 and 7 and the roller 9. As a result, the bearings 6, 7 and the roller 9 are lubricated. The remaining refrigerating machine oil is discharged into the closed container 1 through an escape hole 5a provided in a portion of the rotating shaft 5 near the electric motor 2.
This will cause the refrigeration oil to return to its original location.

FIG. 2 is a sectional view showing the vicinity of the compressor section 8 in FIG. 1. 5b, 5c, 5d are oil holes, 5e is an oil supply hole, 13a is a groove, 18 is a vane chamber, and 19 is oil suction. mouth,
Reference numeral 20 denotes a partition plate, and parts corresponding to those in FIG.

In the figure, as the roller 6 rotates,
When the vane 11 reciprocates vertically due to the pressing force of the spring 15, the vane chamber 18 becomes wider or narrower. A thin oil inlet 19 is provided between the vane chamber 18 and the reservoir of the refrigerator oil 12, and when the vane chamber 18 expands, the refrigerator oil 12 passes through the oil inlet 19.
Is sucked into the vane chamber 18, and then the vane chamber 18 becomes narrower, the sucked refrigerating machine oil is pushed out to the oil supply pipe 16 and sent to the oil sump 17. Since the refrigerating machine oil is continuously fed to the oil sump 17, the refrigerating machine oil is further sent from the oil sump 17 to the oil supply hole 5e of the rotary shaft 5.

As described above, the oil holes 5c and 5b are provided in the portions of the rotary shaft 5 that face the bearings 6 and 7, respectively, and a part of the refrigerating machine oil sent to the oil supply hole 5e of the rotary shaft 5 is provided. Are extruded from the oil holes 5c and 5b to the inner surfaces of the bearings 6 and 7. Further, a shallow groove 13a is provided in the center of the outer surface of the eccentric portion 13 along the outer surface, and the oil hole 5 is also provided in the groove 13a.
d is provided. A part of the refrigerating machine oil sent through the oil supply hole 5e is also pushed out from the oil hole 5d and is supplied to the inner surface of the roller 9. By providing such a groove 13a in the eccentric portion 13, the entire inner surface of the roller 9 can be lubricated smoothly.

The refrigerant gas compressed in the compressor section 8 is discharged to the space closer to the electric motor 2 than the partition plate 20, and discharged from the discharge pipe 14 to the outside. Refrigerating machine oil is discharged from the clearance hole 5e of the rotary shaft 5 to a space closer to the electric motor 2 than the partition plate 20, and the pressure of the compressed refrigerant gas discharged from the compressor unit 8 causes the refrigerating machine oil to be discharged from the partition plate 20 in the drawing. Pushed to the right. Thereby, the circulation of the refrigerating machine oil is smoothly performed.

FIG. 3 is a sectional view taken along the section line AA 'in FIG. 2. 10b is a discharge port, 21 is a liquid refrigerant suction pipe, and 22 is an injection hole, which correspond to FIGS. The parts are given the same reference numerals.

In the figure, an injection hole 22 connected to a liquid refrigerant suction pipe 21 is provided on the wall surface of the cylinder chamber 10a. Refrigerant gas is supplied to the cylinder chamber 10a from an evaporator (not shown) via a suction port (not shown). At the same time, liquid refrigerant is supplied from the injection hole 22 to the cylinder chamber 10a via the liquid refrigerant suction pipe 21. Injected. The refrigerant gas is compressed by the rotation of the roller 6 to a high temperature, but when the low temperature liquid refrigerant is injected from the injection hole 22, the liquid refrigerant absorbs the heat of the compressed refrigerant gas, whereby the liquid injection is performed. Cooling is performed to prevent the temperature of the refrigerant gas from rising. The refrigerant gas compressed in the cylinder chamber 10a is discharged from the discharge port 10b into the closed container 1 as described above.

The injection hole 22 is provided in one of the bearings 6, as is apparent from FIG. 4 showing a cross section taken along the line BB ′ in FIG. This will be described more specifically. As shown in FIG. 5, the liquid refrigerant passage 22b has a terminating end, and the liquid refrigerant passage 22a is branched from the vicinity of the end of the liquid refrigerant passage 22b and opens into the cylinder chamber 10a. The opening of the liquid refrigerant passage 22b is connected to the liquid refrigerant suction pipe 21, and the liquid refrigerant passage 22a is connected to the liquid refrigerant passage 22b.
The diameter is much smaller than that. In addition, the liquid refrigerant passage 22
The opening of the cylinder a in the cylinder chamber 10a extends like a trumpet.

According to the injection hole 22 having such a configuration, the liquid refrigerant discharged from the liquid refrigerant suction pipe 21 once hits the end of the liquid refrigerant passage 22b, and is stirred here through the liquid refrigerant passage 22a to pass through the liquid refrigerant passage 22a. It is injected into 10a. Due to the stirring and the trumpet-shaped opening of the small-diameter liquid refrigerant passage 22a, the liquid refrigerant is atomized into a fine mist and sufficiently spread to be injected into the cylinder chamber 10a. Therefore, this liquid refrigerant spreads almost throughout the cylinder chamber 10a, and the refrigerant gas is efficiently cooled.

In this embodiment, Freon 22 is used as the refrigerant. As the refrigerating machine oil, it is necessary that the two-layer separation temperature is lower than that of the Freon 22 and that the refrigerating machine oil has an appropriate viscosity at a predetermined temperature. Considering this point,
Z300A (trade name) manufactured by Nippon San Oil Co., Ltd. relating to an alkylbenzene oil having a viscosity of 50 to 65 cst at 40 ° C. and a viscosity of 5.5 to 6.5 cst at 100 ° C. can be used. FIG. 6 shows the relationship between the coefficient of performance (COP = refrigeration capacity (W) / compressor input (W)), the adiabatic coefficient (ηad = coefficient of performance / coefficient), and the minimum film thickness with respect to the refrigerator oil viscosity (cst) on the horizontal axis. It is a thing. If the viscosity is low, CO
Although P and ηad are high, the oil film formation is poor and the minimum film thickness cannot be obtained, and when the viscosity is high, the oil film is easily formed, but COP and ηad are lowered. The above Z300A has a viscosity of 50 to 65 cs at 40 ° C.
Therefore, the minimum oil film thickness of the sliding portion can be secured while maintaining each performance. Therefore, by using Z300A as the refrigerating machine oil, it is possible to prevent the oil from rising in the compressor in the low temperature range of the evaporation temperature of 10 ° C. or less, and it is possible to improve the reliability of the compressor.

Further, as described above, since the liquid refrigerant is injected into the cylinder chamber 10a from the injection hole 22, the temperature of the refrigerant gas of the CFC 22 to be compressed is suppressed from rising, so that it is a refrigerating machine oil Z300A. It is possible to prevent the deterioration of the characteristics of the bearings, to suppress the wear of the sliding parts such as the bearings 6 and 7, which were caused by the deterioration of the characteristics of the high temperature refrigerant gas and the refrigerating machine oil in the past, and to prevent accidents such as galling and baking due to friction powder. it can.

Further, since Z300A, which is a refrigerating machine oil, has a low two-phase separation temperature from the Freon 22, even if the compressed gas of the Freon 22 mixed with the Z300A is radiated by the condenser to lower the temperature, each becomes a gas. The two phases of the liquid are not separated but are supplied to the liquid receiver while being mixed, and are returned to the compressor through the evaporator 11 and the check valve 17 in the mixed state. Therefore, the recovery rate of the refrigerating machine oil to the compressor is high, and the refrigerating machine oil can be used efficiently.

The amount of refrigerating machine oil filled depends on the amount of refrigerant filled (approximately 0.25 to 0.5 times), and in this embodiment, 550 ml or more can be filled.

By the way, generally, a polymer material having a high glass transition temperature is improved in refrigerant resistance (deterioration property, etc.), but is expensive. Therefore, in order to improve reliability at a relatively low cost, a thin film multilayer structure for the interior and exterior is used, and the glass transition temperature of the exterior polymer material is higher than the glass transition temperature of the interior polymer material. Need to be structured. Figure 7
As shown in (a), winding 4a of the stator of a conventional electric motor
, The core wire 4a1 has a glass transition temperature of 190 to
It was covered with a polymeric material film 4a2 at 200 ° C. For example, the polymer material may be ester imide.

On the other hand, in this embodiment, as shown in FIG.
As shown in Fig. 2, the winding 4a (Fig. 2) of the stator is a double-coated enameled wire, the core wire 4a of which is covered with a polymer material coating 4a1 having a glass transition temperature of 190 to 200 ° C. Glass transition 250-300
It is covered with the polymer material coating 4a2 at ℃. The polymer material coating 4a1 is for ensuring electrical insulation, and, for example, an oligomer is produced by the Freon 22, but an inexpensive polymer material such as ester imide is used, and the polymer material coating 4a2 is formed by the Freon 22. A polymer material that does not emit an oligomer, such as amide imide. As a result, the electrical insulation of the winding 4a can be ensured at a low cost, and the generation of oligomers can be suppressed even when the Freon 22 is used as the refrigerant.

The insulating film 4b (FIG. 2) of the stator 4 is composed of a polyethylene terephthalate film which does not emit oligomers due to the flon 22. In this way, the amount of the oligomer that is dissolved in the refrigerant or the refrigerating machine oil and circulates in the refrigeration cycle is reduced, and the crystallites of the oligomer generated in the low temperature portion of the compressor unit 8 are reduced, so that the rotating shaft 5
It is possible to prevent the rotation of the roller and the rotation of the roller 9 in the compressor unit 8 from being delayed, resulting in a poor compression state.

Furthermore, the rotary shaft 5 including the eccentric portion 13
Surface roughness Rz ≦ 1.2 μm on the surface of which a surface roughness Rz ≦ 4.2 μm is formed on the surface by nitriding and nitriding to form a coating with a clearance of 4 to 27 μm from the bearings 6 and 7, and the eccentric portion 13 The clearance between the roller and the roller is 8 to 32 μm. Further, a coating film is formed on the surface of the vane 11 by sulphidizing and nitriding treatment, and the surface roughness of the coating film is set to Rz ≦ 4.2 μm, and the clearance with the cylinder chamber 10a is 18 to 28 μm.
m. Further, the material of the roller 9 is monichrome alloy cast iron. By doing so, the rotating shaft 5
The mechanical strength of the surface of the vane 13 is increased, wear can be suppressed, variation in clearance can be suppressed, and vibration generated due to temperature increase of the sliding portion due to decrease in clearance and increase in clearance can be prevented. ..

Further, a closed vane chamber 18 having a vane 11 which reciprocates with the rotation of the roller 9 is provided, and the reciprocating motion of the vane 11 causes the refrigerating machine oil to be stored in the vane chamber 18. Since 12 is refueled and this refrigerating machine oil is sent from the vane chamber 18 to the oil sump 17 and forcedly sent to the oil supply hole 5e of the rotary shaft 5, by making it possible to seal 550 ml or more of the oil amount, Even when the rotating shaft 5 is arranged and supported by the pair of bearings 6 and 7 so as to be substantially horizontal, the refrigerating machine oil can be reliably, smoothly and sufficiently supplied to the bearings 6 and 7 and the roller 9.

As described above, in this embodiment, the Freon 22 is used as the refrigerant, and the compressor can be made highly reliable even in the horizontal type.

Next, a specific example of a hermetically-sealed small refrigerator using the hermetically-sealed horizontal rotary compressor described above will be described. FIG. 8 shows the refrigerating cycle, and
Is a solenoid valve, 32 is a strainer, and 33 is a capillary tube. The parts corresponding to those in FIG.

In the figure, the liquid refrigerant from the dryer 24 is supplied to the liquid receiver 25, most of which is supplied to the evaporator 27 through the expansion valve 26, but some of which is reticulated through the solenoid valve 31. Is supplied to the strainer 32 of FIG. 1 and is freed from dust and the like, and then is decompressed by the capillary tube 33 and supplied to the liquid refrigerant suction pipe 21 shown in FIGS. 4 and 5 in the compressor 30 of the above-described embodiment. As a result, the compressor 30
Liquid injection cooling is performed in the compressor section 8 of FIG. The other operations are the same as those of the conventional refrigeration cycle shown in FIG.

By such liquid injection cooling, the temperature of the compressed gas of the flon 22 discharged from the compressor 30 is suppressed from being higher than that of the flon 12, and the carbonization of the refrigerating machine oil and the sliding parts in the compressor 30 are suppressed. Although abrasion is suppressed, as described above, in the compressor 30, the viscosity of the refrigerating machine oil at 40 ° C. is 55 to 65 cst, 1.
Carbonization of the refrigerating machine oil is further improved by using an alkylbenzene oil having a viscosity of 5.5 to 6.5 cst at 00 ° C.

The closed type small refrigerator of the refrigerating cycle shown in FIG. 8 uses such a compressor. Next, the closed type small refrigerator for commercial refrigerators and showcases, which is a problem of the closed type small refrigerator, will be described. The embedded space, especially the reduction of height will be described.

A problem with the height of the hermetically sealed compact refrigerator is not only the height of the compressor but also the external dimensions of the condenser and the fan. In general, heat transfer in an air-cooled condenser is: Q = K × S × Δt where Q: heat exchange amount (kcal / h) in the condenser K: heat transmission coefficient (kcal / m ² h ° C.) S: heat transfer Thermal area (m ² ) Δt: represented by average temperature difference (° C.). The cooling air volume V of fans, V = Q / 0.28 (t 2 -t 1) where, V: amount of cooling air (m ³ / h) Q: heat exchange amount in the condenser (kcal / h) 0.28: Specific heat of air per m ³ (kcal / m ³ ° C t ₁ : Air temperature at the outlet of the condenser (° C) t ₂ : Represented by the air temperature at the inlet of the condenser (° C), When the number of rows of pipes in the condenser is fixed,
In order to prevent the heat transfer area from changing when the height is lowered, the length may be extended in the width (lateral) direction.

The height of the hermetic horizontal rotary compressor according to the present invention is 165 as shown in FIG.
It can be less than or equal to mm. A hermetic small refrigerator using this uses the hermetic horizontal rotary compressor as the compressor 30 of the refrigeration cycle shown in FIG.
FIG. 10 shows the external appearance of a specific example of this closed compact refrigerator. However, 35a and 35b are fans, and the same reference numerals are given to the portions corresponding to the above drawings.

In FIG. 10, the substrate 36 is shown in FIG.
Similar to the conventional hermetically sealed small refrigerator shown in FIG. 1, the hermetically sealed horizontal rotary compressor 30 of the embodiment of the present invention shown in FIG. 1, the condenser 23, the evaporator 27, the power supply 34, etc. are arranged. Figure 15
Since the hermetic horizontal rotary compressor 30 is horizontally long as compared with the substrate 36 'in the conventional hermetically-sealed small refrigerator shown in FIG. 1, the substrate 36 is horizontally long in the direction of the arrow X as shown in the figure. .. Further, as described above, the height of the condenser 23 does not exceed the height of the hermetic horizontal rotary compressor 30 (165 mm or less), and the high temperature and high pressure from the hermetic horizontal rotary compressor 30 is high. In order to make the cooling effect of the compressed gas of at least about the same as that of the conventional closed type small refrigerator, the condenser 23 is horizontally long in the direction of the arrow X (for example, the ratio of height to width is 1 to 2 or more). And, the electric heating area for receiving the cooling air from the fan is at least about the same as that of the conventional closed type small refrigerator.

In this case, as a result of the heat transfer area becoming horizontally long, it is not possible to efficiently send the cooling air to the condenser 23 with one fan as in the conventional closed type small refrigerator, so that as shown in the figure. , With an outer diameter of about the height of the condenser 23
A number of fans 35a, 35b or more fans are used so that cooling air can be sent to the condenser 23 at the same time. As a result, the condenser 23 can cool the compressed gas at least as efficiently as the condenser of the conventional closed type small refrigerator.

FIG. 11 shows an example of the external dimensions of the hermetically-sealed compact refrigerator having the above-mentioned structure using the hermetically-sealed horizontal rotary compressor of the present invention.
Is shown in the table.

Next, an example of installation of the above-mentioned closed compact refrigerator in a showcase will be described with reference to FIG. The closed type small refrigerator 44 of the above-mentioned specific example is arranged in the machine room 43 below the showcase 41, but the heat exhaust direction of the heat from the condenser 23 of the closed type small refrigerator 44 in the current showcase 41. Is mainly the front and rear surfaces of the product, and naturally, in the installation of the closed type small refrigerator 44 in the showcase 41, the width direction of the condenser 23 and the width direction of the showcase 41 are substantially parallel to each other. Is set. In this case, the service side of the showcase 41 is the front side, the condenser 23 is arranged on the front side, and the panel 42 provided at the lower part of the front side is opened so that the condenser 23 can be cleaned. To

When a conventional closed type small refrigerator is incorporated in a showcase, the height of the closed type small refrigerator is originally high, and the internal volume of the showcase occupies a large amount. Therefore, the volume of the machine room 43 cannot be reduced. The only option was to increase the external dimensions. On the other hand, the hermetically sealed compact refrigerator 44 using the hermetically sealed horizontal rotary compressor according to the present invention has a low height.
When the above is incorporated into the showcase 41, the volume of the machine room 43 can be reduced, and the internal volume of the place 45 of the showcase 41 where food can be placed can be increased. As an example, the effect of installing an 750 W output refrigerator for an open showcase with a built-in refrigerator for fruits and vegetables will be described with specific dimensions. In FIG. 17, the height of a conventional closed compact refrigerator is 300 mm. The width and depth of the open showcase with a built-in refrigerator for fruits and vegetables are 1,309 mm, 900 mm, and 1,850 mm, respectively, and the effective internal volume of this case is 505 liters. On the other hand, the height of the hermetically sealed small refrigerator 44 using the hermetically sealed horizontal rotary compressor according to the present invention is 220 mm, which is the same as that of the showcase in which the conventional hermetically sealed small refrigerator is installed. The height of the machine room can be reduced by incorporating it into the showcase, and the effective internal volume of this case is 665.
Liter, about 17% compared to the conventional one
The effective internal volume can be increased.

As described above, in this specific example, the horizontal width is wider than that of the conventional hermetic horizontal rotary compressor shown in FIG. 15, but since the horizontal width of the showcase is wide, it is not a particular problem.

FIG. 13 is a cross-sectional view showing a specific example of the liquid receiver 25 in the closed compact refrigerator shown in FIG.
5a is a container, 25b is a lid, 25c is a cone, 37, 3
Reference numeral 8 is a refrigeration cycle pipe, 39 is a liquid injection pipe, and 40 is a liquid refrigerant. In the figure, the receiver 25
Has a conical portion 25c in a portion close to the bottom, and has a bottomed cylindrical container 25a having a narrowest cross-sectional area from the portion close to the bottom to the bottom and the upper opening thereof. A lid 25b attached to the container 25a so as to close it, and a refrigeration cycle pipe 37 connected to the dryer 24 of FIG. 8 and a refrigeration cycle pipe connected to the expansion valve 26 of FIG. 8 in the container 25a. 38, and the solenoid valve 31 of FIG.
A liquid injection pipe 39 connected to is attached.

The liquid refrigerant sent from the dryer 24 through the refrigeration cycle pipe 37 enters the liquid receiver 25, and the refrigerant gas sent together with the liquid refrigerant accumulates above the container 25a. It accumulates downward in the liquid refrigerant. In this way, gas-liquid separation is performed. Refrigeration cycle piping 3
8 and the tip opening of the liquid injection pipe 39 are the container 2
Since it is positioned almost at the bottom of 5a, only the liquid refrigerant 40 accumulated below the container 25a enters the refrigeration cycle pipe 38 and the liquid injection pipe 39, and the expansion valve 26 and the solenoid valve 31 of FIG. Sent to.

As described above, since the conical portion 25c is provided near the bottom of the container 25a to reduce the area of the bottom, the size of the receiver and the tip of the pipe are smaller than those of the receiver shown in FIG. When the distance field from the bottom of the opening is equal, the amount of the liquid refrigerant remaining in the liquid receiver 25 decreases. Therefore, the refrigerant efficiently circulates in the refrigeration cycle, and the residual amount of the refrigerating machine oil mixed in the liquid refrigerant in the liquid receiver 25 can be reduced. Moreover, as described above, the freon 22 is used as the refrigerating machine oil.
In combination with the use of Z300A, which has a low two-phase separation temperature, the refrigerating machine oil returns to the hermetic horizontal rotary compressor 30 at a high rate, and the refrigerating machine oil can be effectively used.

[0064]

As described above, according to the hermetic horizontal rotary compressor of the present invention, the temperature of the compressed gas of the refrigerant, which is the Freon 22, can be lowered, so that the sliding portion is worn and the frozen portion is frozen. The characteristic deterioration of the machine oil can be prevented, the refrigerator oil can be used without waste, and the reliability is greatly improved.

Further, it is possible to suppress the generation of oligomers from the windings of the electric motor and the insulating film, and the defective rotation of the rotating shaft and the roller caused by this is eliminated, and the reliability is greatly improved.

Further, since a coating film is formed on the surfaces of the rotary shaft and the vane by the sulphidizing and nitriding treatment, and the material of the roller is monichrome alloy cast iron, the wear resistance of the sliding portion is increased, and there Accidents such as galling and burning can be prevented,
Reliability is increased. Also, variations in the clearance between the rotary shaft and the bearing, the clearance between the eccentric part of the rotary shaft and the roller, and the clearance between the vane and the groove of the cylinder can be suppressed, and the temperature rise and vibration of the sliding part can be prevented. can do.

Furthermore, when the rotary shaft of the compressor section is arranged so as to be substantially horizontal, oil is reliably supplied to the sliding section, and reliability is improved.

Furthermore, the liquid refrigerant is sprayed in a fine mist form from the injection hole into the cylinder chamber, so that the temperature of the compressed gas is efficiently lowered.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the entire structure of an embodiment of a hermetic horizontal rotary compressor according to the present invention.

FIG. 2 is a cross-sectional view showing the vicinity of a compressor section in FIG.

FIG. 3 is a cross-sectional view taken along the section line AA ′ in FIG.

FIG. 4 is a cross-sectional view taken along the section line BB ′ of FIG.

5 is a cross-sectional view showing a specific configuration of the liquid injection hole in FIG.

FIG. 6 is a diagram showing one characteristic example of the refrigerating machine oil in the embodiment shown in FIG.

7 is a cross-sectional view showing a comparison between the winding structure of the stator of the electric motor and the winding structure of the stator in FIG. 2 in the conventional hermetic rotary compressor.

FIG. 8 is a diagram showing a refrigeration cycle of a specific example of a small hermetic refrigerator using the hermetic horizontal rotary compressor according to the present invention.

9 is an external view of the specific example shown in FIG.

10 is a perspective view showing the configuration of the specific example shown in FIG.

11 is a diagram showing an example of outer diameter dimensions of the specific example shown in FIG.

12 is a cross-sectional view showing a showcase in which the specific example shown in FIG. 10 is installed.

13 is a cross-sectional view showing a specific example of the liquid receiver in the refrigeration cycle shown in FIG.

FIG. 14 is a cross-sectional view showing an example of a conventional hermetic rotary compressor.

FIG. 15 is a perspective view showing a configuration of an example of a conventional closed type small refrigerator.

FIG. 16 is a view showing a refrigeration cycle of a conventional closed type small refrigerator.

FIG. 17 is a cross-sectional view showing an example of a showcase in which a sealed small refrigerator is installed.

FIG. 18 is an external view of an example of a conventional closed type small refrigerator.

FIG. 19 is a cross-sectional view showing an example of a liquid receiver in a conventional closed type small refrigerator.

FIG. 20 is a perspective view showing a part of the structure of the stator of the electric motor in the hermetic rotary compressor.

[Explanation of symbols]

 1 Airtight container 2 Electric motor 3 Rotor 4 Stator 4a Winding 4a1, 4a2 Polymer material coating 4b Insulating film 5 Rotating shaft 5c, 5d Oil hole 5e Oil supply hole 6, 7 Bearing 8 Compressor section 9 Roller 10 Cylinder 10a Cylinder chamber 11 Vane 12 Refrigerating Machine Oil 13 Eccentric Part 14 Discharge Pipe 15 Spring 18 Vane Chamber 22 Injection Hole

Front page continuation (72) Inventor Hiroaki Hatake 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Hitachi Ltd. Tochigi factory

Claims (5)

[Claims] 1. An electric motor, a rotary shaft fitted to a rotor of the electric motor and having an eccentric portion, a bearing for holding the rotary shaft, and the eccentric portion fitted in a closed container for storing refrigerating machine oil. Roller for eccentrically rotating in the cylinder to compress the refrigerant, and a base for transporting the refrigerating machine oil by reciprocating the inside of the groove of the cylinder with its tip abutting against the roller.
A compressor unit having a compressor is housed, and the rotating shaft is supported substantially horizontally by the bearing, so that the electric motor and the compressor unit are arranged substantially horizontally, and the evaporation temperature is 10 ° C. or less. In a hermetic horizontal rotary compressor used for refrigerating and air-conditioning equipment, Freon 22 is used as the refrigerant, the viscosity is 50 to 65 cst, and the viscosity is 5.5 at 100 ° C.
A hermetic horizontal rotary compressor characterized in that an alkylbenzene oil of 6.5 cst is used as the refrigerating machine oil, and an injection hole for injecting a liquid refrigerant into the cylinder is provided in the bearing. 2. The winding of the stator of the electric motor according to claim 1, wherein the core wire has a glass transition temperature of 190 to 200 ° C.
Of the first polymer material, the coating of the first polymer material is further coated with the second polymer material having a glass transition temperature of 250 to 300 ° C., and the insulating film of the electric motor is A sealed horizontal rotary compressor characterized by being a polyethylene terephthalate film. 3. The bearing according to claim 1, wherein the rotary shaft has a surface roughness of 1.2 μm or less and a coating having a surface roughness of 4.2 μm or less formed on the surface by nitrosulfurization treatment. Is 4 to 27 μm, and the clearance between the eccentric part and the roller is 8 μm.
.About.32 .mu.m, and the vane has a surface roughness of 4.2 .mu.m or less formed on the surface thereof by nitrosulfurization treatment, and the clearance between the vane and the groove of the cylinder is 18 to 28 .mu.m.
The hermetically sealed horizontal rotary compressor is characterized in that the roller is made of monichrome alloy cast iron. 4. A vane chamber which is hermetically formed at the rear of the vane according to claim 1, wherein the vane chamber communicates with a lubricating oil sump portion at the bottom of the hermetic container. The communicating hole portion and the oil supply passage for supplying refrigerating machine oil to the bearing portion of the compression mechanism portion are provided, and the oil sump portion communicating with the oil supply hole of the rotary shaft is provided at the outlet of the oil passage. A characteristic hermetic horizontal rotary compressor. 5. The injection hole according to claim 1, wherein the injection hole has a first liquid refrigerant passage having an end portion in the bearing, and one end opening near the end portion of the first liquid refrigerant passage, A hermetic horizontal rotary compressor comprising a second liquid refrigerant passage having a diameter smaller than that of the first liquid refrigerant passage having the other end opened to the cylinder.