JP2803625B2 - Refrigerant compressor, refrigerator and air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating and air-conditioning apparatus using a refrigerant mainly containing hydrofluorocarbon as a refrigerant.

[0002]

2. Description of the Related Art An example of a conventional refrigeration system is shown in FIG. Conventionally, for example, “Tribologist”, Vol. 35, No. 9 (19
As shown in pp. 621-626 of 1990, when a refrigeration apparatus is configured using a HFC134a refrigerant which is a hydrofluorocarbon, mutual solubility between the refrigerant and the refrigeration oil is one of the important characteristics, and PAG ( Polyether) and ester-based refrigerator oils have been used. Figure 11 shows the HFC
134a shows a refrigeration apparatus using a refrigerant 134a, 1 is a compressor for compressing refrigerant gas, 2 is a condenser for condensing high-pressure refrigerant gas discharged from the compressor 1, 3 is a capillary tube,
Reference numeral 4 denotes an evaporator, reference numeral 5 denotes a header having a refrigerant amount adjusting function, reference numeral 6 denotes a refrigerating machine oil which is stored in the compressor 1 and lubricates a sliding portion of the compressor 1 and seals a compression chamber.
6a or ester-based refrigerating machine oil 6b.

Next, the behavior of oil will be described. Compressor 1
Is discharged to the condenser 2. Here, for example, in a compressor using a high-pressure container, most of the lubricating oil 6a or 6b used for sealing the compression chamber or the like is separated in the compressor, but the weight ratio to the refrigerant is 0%. About 0.5 to 1.0% of the oil 6a or 6b is discharged from the compressor 1 together with the refrigerant. Since the discharged oil 6a or 6b has mutual solubility with the refrigerant, it has good fluidity, the condenser 2, the capillary tube 3, the evaporator 4, and the header 5
And returns to the compressor 1. Therefore, the lubricating oil 6 does not disappear from the compressor 1 and normal lubrication becomes possible.

[0004]

The conventional HFC134a
Is constructed as described above, but the polyether 6a has a volume resistivity of 10 @ 7 to 10 @ 10 .OMEGA.cm, a saturated water content of about 25,000 ppM, and the characteristics of the ester-based refrigerator oil are 10 @ 12 to 10 @ 14 .OMEGA. cm, about 1
Although it has been improved to 500 ppM, the characteristics of the current refrigerating machine oil for CFC12 are 1015 Ω · cm, which is considerably inferior in electric insulation and hygroscopicity as compared with about 500 ppM. In addition, moisture absorption must be kept as low as possible from the viewpoint of handling of assembly parts of the compressor and handling of the completed compressor. There was a problem.

[0005] Also, when assembling a refrigerator, there are many problems in handling during production, such as shortening the time during which the refrigeration cycle is opened, and when a large amount of moisture enters the refrigeration cycle, the generation of sludge is accelerated, and the moisture is reduced. There have been problems such as freezing and blockage of the capillaries causing poor cooling.

Further, in the conventional refrigeration system of HFC134a, if the hygroscopicity is high, it is difficult to prevent rust of the compressor parts, and the inside of the capillary tube of the refrigeration / air-conditioning system or the expansion valve is clogged by freezing, and the ester oil due to moisture is removed. Sludge is generated due to promotion of hydrolysis, and sludge is generated due to promotion of hydrolysis of polyethylene terephthalate used as a motor insulating material. In order to prevent this, it is necessary to carefully remove the moisture of oil and the moisture in the refrigerant circuit in the manufacturing process as compared with the system using the CFC12 refrigerant, and also to improve the moisture trapping ability of the dryer provided in the refrigerant circuit. There was a problem that there was a larger dryer than before in order to increase.

Further, in the conventional refrigeration system, when the compressor is stopped, the liquid refrigerant returns to the inside of the compressor container from the suction port, and when the compressor is restarted, the lubricating oil in the compressor is taken out of the compressor together with the liquid refrigerant from the compressor into the refrigeration system. Since the lubricating oil is a HFC134a refrigerant having low compatibility, it is difficult for the lubricating oil to return to the compressor until the flow reaches a certain flow rate (= flow rate) or more.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is intended to reduce the hygroscopicity of oil applied to a motor wire for a compressor, impregnated oil to a sintered part, and oil for assembling a compressor. In addition to improved handling, a refrigeration system with excellent electrical insulation can be configured, ensuring low-temperature fluidity in the evaporator and header, reducing the thickness of the oil film adhering to the inner wall of the evaporator, and improving the heat exchange rate. To obtain a refrigerant compressor and a refrigeration air-conditioning device that prevent the deterioration, and to provide a highly reliable refrigeration air-conditioning device such as a refrigerator that has excellent electrical insulation and moisture absorption properties, and ensures that the refrigerating machine oil returns to the compressor without stagnation. It is intended to be used.

[0009]

According to a first aspect of the present invention, there is provided a refrigerant compressor comprising a condenser , a throttle , and an evaporator connected by piping.
The compressor is connected to a refrigerant circuit
The refrigerant compressor that circulates the refrigerant returned to the compressor
Compress and discharge refrigerant mainly composed of lofluorocarbon
Is stored in a container of the compressor, and slides the compressor.
Lubricate and seal the compression chamber and before the compressor
If the refrigerant flows into the refrigerant circuit, the refrigerant
A lubricating oil that circulates through the circuit.
In the liquid portion of the medium circuit, the hydrofluorocarbon
It has no mutual solubility with the refrigerant mainly composed of
And the lubricating oil flows through the squeezed portion of the refrigerant circuit.
To have a low viscosity with fluidity to return to the compressor.
It is characterized by doing.

[0010] The refrigerant compressor according to the second aspect has a low fluidity and fluidity that returns the lubricating oil to the compressor in a predetermined time when a large amount of lubricating oil flows out of the compressor.

The refrigerant compressor according to claim 3 is mounted as lubricating oil.
Oil viscosity at operating ambient temperature is 200 cSt or less.
It is characterized by using such an oil.

[0012] refrigerating and air-conditioning apparatus according to claim 4, Hydro full
A compressor that circulates a refrigerant mainly composed of orocarbon,
Refrigerant circuit configured by connecting condenser and evaporator with piping
And sealed in the closed vessel of the compressor ,
No mutual solubility and fluidity to return to the compressor
A lubricating oil having a low viscosity, the evaporator and the compression
Flow between the compressor and the evaporator
And a backflow prevention mechanism for preventing
You.

According to a fifth aspect of the present invention, there is provided the refrigeration / air-conditioning apparatus, wherein the refrigerant circuit
Is an accumulator between the backflow prevention mechanism and the evaporator.
Are connected by piping, and the accumulator
Has an upper side connected to the outlet side of the evaporator.
Then, inserted into the accumulator from the lower side to the upper side.
Suction pie connected to the inserted backflow prevention mechanism
And the accumulator of the suction pipe
Pipe opening provided at the top of the pipe
The lubricating fluid formed between the accumulator and the bottom of the accumulator.
Refrigerant sump in which lubricating oil and the refrigerant are stored in a two-layer separated state
And a unit .

The refrigerator according to claim 6 is the refrigerator according to claim 4 or 5.
Use a freezing air conditioner.

In the refrigeration / air-conditioning apparatus of the present invention, an oil having a lubricating oil viscosity of 2000 cSt or less at the evaporating temperature of the apparatus is used as the lubricating oil .

The refrigeration and air-conditioning system according to claim 8, wherein the lubricating oil has a lubricating oil viscosity of 200 cSt at an operating ambient temperature of the device.
Use the following oil.

In the refrigeration / air-conditioning apparatus of the ninth aspect, a high-pressure vessel type compressor is used as the compressor used in the apparatus. Claim 1
0 refrigerant compressor and the refrigeration air conditioner according to claim 11,
The specific gravity of the lubricating oil is lighter than that of the refrigerant.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 11 is a sealed container, 12 is a motor for driving a compressor, 13 is an insulation-coated electric wire used for the electric motor 12, and 6c is applied for improving the slipperiness of the electric wire and improving the winding workability. Hard alkyl benzene oil, which constitutes the compression chamber, the cylinder 16 and the bearing 17
The iso-sintered parts are impregnated with the hard alkylbenzene oil 6c, and the hard alkylbenzene oil 6c is lubricated even when assembling the compressor body sliding parts.

As a refrigerant as shown in FIG.
In the refrigerating apparatus using 134a, a hard alkylbenzene oil 6c is used as the refrigerating machine oil 6 of the compressor 1.

In the refrigerant compressor 1 configured as described above, since the hard alkylbenzene oil 6c is used as a coating and impregnating oil for each part and also as an assembling oil, the hygroscopicity can be suppressed to a low level. And handling of compressor parts using the CFC12 refrigerant.

Further, since a hard alkylbenzene oil having a good electrical insulation property (volume resistivity: 1015 to 1016 Ω · cm) is used as the refrigerating machine oil, leakage can be handled in the same manner as an apparatus using a CFC12 refrigerant.

Embodiment 2 FIG. Embodiment 2 of the present invention will be described. HFC1 as a refrigerant as shown in FIG.
In the refrigeration apparatus using the compressor 34a, the lubricating oil 6
Used is a low-viscosity hard alkylbenzene oil 6d.
This low-viscosity hard alkylbenzene oil 6d is made of a conventional C
The hard alkyl benzene oil 6c used as the lubricating oil of the FC12 compressor should have a viscosity lower than that of the hard alkylbenzene oil 6c. Generally, in a refrigerating apparatus such as a refrigerator using a rotary compressor, the oil 6c is about 32 cSt at 40 ° C. as the oil 6c. Although those having a viscosity were used, the viscosity in the evaporator 4 was about 1000 to 5000 cSt in consideration of the dissolution of the refrigerant. Therefore, in order to obtain the same viscosity even with a low-viscosity hard alkylbenzene oil 6d in which HFC134a does not dissolve, the viscosity is about 10 to 22 cSt at 40 ° C. If the viscosity in the evaporator 4 is kept the same, the fluidity and the oil film thickness on the inner wall surface of the evaporator can be made almost the same as when the conventional CFC12 refrigerant is used. FIG. 2 shows the relationship between the viscosity of 40 ° C. of the hard alkyl benzene oil (6c, 6d) and the temperature reached by the evaporator 4 during the continuous operation of the compressor of the refrigerator.
For oil 6d at 40 ° C and 10 cSt, the viscosity is 32 cS at 40 ° C.
The temperature reached is almost the same as that of the ester oil of t, and the cooling performance can be said to be good. The viscosity of the oil 6 at the sliding portion in the compressor 1 also changes depending on whether or not the oil 6 has mutual solubility. Since the penetration ratio of CFC12 is substantially the same, the low-viscosity oil 6d
The use of C can ensure the same level of actual viscosity lubricity as the CFC 12 6c even in the sliding portion.

Further, in the first embodiment, the hard alkylbenzene oil 6c is used as the assembling oil, but the use of the low-viscosity hard alkylbenzene oil 6d does not change the assembling workability.

Embodiment 3 FIG. Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. 3 and 4, 1 is a compressor for compressing the refrigerant gas, 2 is a condenser for condensing the high-pressure refrigerant gas discharged from the compressor 1, 3 is a capillary tube, 4 is an evaporator, and 5 is a refrigerant amount adjustment. 6 is a refrigerant reservoir accumulator having a function.
And a hard alkyl benzene oil 6c having no mutual solubility with HFC134a. Further, the outlet side of the evaporator 4 is connected to the upper side of the accumulator 5, and the suction side of the compressor 1 is connected to the lower side. The suction pipe 7 is inserted into the accumulator 5 and extends upward. An oil return hole 8 is provided. The oil return hole 8 is provided relatively above the suction pipe 7.

Like the conventional accumulator 5, the lower side of the accumulator 5 is connected to the outlet side of the evaporator 4, the upper side is connected to the suction side of the compressor 1, and inserted into the accumulator 5 from the lower side to the upper side. When the refrigerant reservoir is formed by the pipe, the refrigerant and the oil dissolve in the case of the ester oil 6b alone having mutual solubility with the refrigerant HFC134a and return to the compressor 1 without the oil staying in the accumulator 5. , HF
In the case of the hard alkylbenzene oils 6c and 6d having no mutual solubility with C134a, the oil accumulates in the accumulator 5 and reduces the amount of oil in the compressor 1, which hinders lubrication and sealing of the sliding member. The pipe connection is reversed so that the upper side is connected to the outlet side of the evaporator 4, the lower side is connected to the suction side of the compressor 1, and the oil is attached to the side wall of the suction pipe 7 inserted into the accumulator 5 from the lower side to the upper side. By providing the return hole 8, the oil is surely returned to the compressor 1 side and does not accumulate in the accumulator 5 even if it does not dissolve in the refrigerant.

The oil return hole 8 is located relatively above the connection pipe 7 inserted into the accumulator 5, so that the oil 6 having a lower specific gravity than the HFC134a refrigerant can be used.
c and 6d return to the compressor 1 in the same manner as described above. In addition, since the refrigerant accumulates in the accumulator 5 below the oil return hole 8, the function for adjusting the load fluctuation of the refrigerator can be satisfied, and appropriate efficient cooling can be performed.

Since there is no mutual solubility with the HFC134a refrigerant, the compressor 1 is not affected by fluctuations in the ambient temperature of the refrigerator and load conditions.
Since the amount of refrigerant dissolved in the internal oil 6 is small in absolute amount and small in fluctuation amount, not only can the accumulator 5 for adjusting the refrigerant amount be downsized, but also there is no inappropriate cooling due to excess or deficiency of the refrigerant, thereby improving the efficiency. When a high-pressure vessel type rotary compressor is used, the amount of charged refrigerant is 1
The amount can be reduced by an amount corresponding to 0% to 20%.

Embodiment 4 Although HFC134a and hard alkyl benzene oil have been described as examples, other combinations of oils that are not compatible with the refrigerant can exhibit the same effect.

Embodiment 5 Hereinafter, a fifth embodiment of the present invention will be described. Hard alkylbenzene is used as the refrigerating machine oil. 200 oil viscosity at ambient temperature
By using an oil that is incompatible with the refrigerant having a temperature of cSt or less, even if a large amount of oil leaks into the circuit such as blocking the capillary tube of a refrigerator, the oil returns to the compressor. Has been confirmed by FIG.
Is an experimental device for investigating the above phenomenon, and FIG. 6 shows the result of this investigation. The device in FIG. 5 is provided with an oil sump 19 on the high pressure side of a refrigerant circuit of a refrigerator to make the inside of the compressor 1 oil-free,
This is a device for starting up the compressor 1 from a state in which the HFC134a refrigerant 18 is stored in the compressor 1 and examining the behavior of oil. When started, the refrigerant 18 is compressed, and the discharge pressure gradually increases. However, the higher the viscosity of the oil and the lower the ambient temperature, the worse the oil returns to the compressor 1 as shown in FIG.
According to FIG. 7, the oil viscosity at ambient temperature is 200 cS
If it is not less than t, it is understood that the capillary tube 3 is blocked by the oil and the oil does not return for at least 240 minutes or more. However, if it is 200 cSt or less, the oil returns in several tens of minutes, so that the capillary tube is not blocked by the oil. Therefore, by setting the oil viscosity to 200 cSt or less at the ambient operating temperature of the device, it is possible to configure a device that can reliably return oil even in an extreme state.

Embodiment 6 FIG. Further, by using an oil having an oil viscosity of 2000 cSt or less at the evaporating temperature of the device, the cooling performance of the device can be made equal to that when using oil having mutual solubility. FIG. 7 shows the relationship between the cooling performance and the oil viscosity during the continuous operation of the refrigerator. As is clear from FIG. 7, when the temperature is equal to or lower than 2000 cSt at the evaporation temperature, it is possible to attain a temperature almost equal to the case where a soluble ester oil is used.

Embodiment 7 When the high pressure vessel type is used as the compressor, the oil of the present invention has no mutual solubility with the refrigerant, so that the refrigerant shortage caused by the change in the amount of refrigerant dissolved into the oil 6 in the compressor 1 due to a change in the ambient temperature of the device and The phenomenon of too much refrigerant is reduced. Further, the required amount of refrigerant can be reduced by the amount that the refrigerant does not dissolve in the oil 6. Specifically, the amount of refrigerant corresponding to 10 to 20% by weight of the enclosed oil amount can be reduced as compared with the case where compatible oil is used.

Embodiment 8 FIG. The outlet side of the evaporator 4 is connected to the upper side of the header 5 and the suction side of the compressor 1 is connected to the lower side. The suction pipe 7 is inserted into the header 5 and extends upward. The refrigerant flow is from the upper side to the lower side.

The evaporator 4 like the conventional header 5
The lower side of the header 5 is connected to the outlet side, and the compressor 1 is connected to the upper side.
When the refrigerant liquid reservoir is formed by a pipe connected to the suction side and inserted into the header 5 from the lower side to the upper side, the refrigerant HF
Oil that is incompatible with C134a, for example, a hard alkylbenzene oil, stays and the amount of oil in the compressor 1 decreases, which hinders lubrication and sealing of the sliding member, but by reversing the flow of the header 5 up and down. The refrigerating machine oil having a specific gravity lower than that of the refrigerant accumulates relatively high in the header 5 and at the same time as the operation, the refrigerating machine oil reliably returns to the compressor 1 without staying in the header 5.

Embodiment 9 20 is a check valve,
It is installed between the compressor 1 and the evaporator 4. Since the refrigerant and the refrigerating machine oil are separated, the viscosity of the refrigerant alone becomes lower than the viscosity in which the refrigerant and the refrigerating machine oil are dissolved. Therefore, when the compressor 1 is stopped, the viscosity of the refrigerant alone is low, so that the fluidity is improved, and the amount of the refrigerant that tends to flow back to the evaporator 4 through the gap of the sliding portion in the compressor 1 increases, As a result, the temperature of the evaporator 4 increases, and the power consumption of the refrigeration apparatus increases. Therefore, by providing the check valve 20 between the compressor 1 and the evaporator 4, it is possible to suppress the backflow of the refrigerant and suppress the temperature rise of the evaporator 4. Further, instead of the check valve 20, a backflow prevention mechanism having a similar function may be provided.

Embodiment 10 FIG. In the above embodiment, the example of the hard alkylbenzene oil 6c is shown as the refrigerating machine oil 6, but a refrigerating machine oil such as a soft alkylbenzene oil having excellent low-temperature fluidity, polyalphaolefin, paraffinic mineral oil, and naphthenic mineral oil is used alone or as a mixture. The same effect can be expected even if used.

Embodiment 11 FIG. Although the refrigerating machine oil of the embodiment satisfies the performance required as a refrigerating machine oil without using additives, it is a hindered phenol-based, amine-based, sulfur-based or the like as an antioxidant. −
Di-t-butyl-4-methylphenol, 4,4′-methylenebis (2,6-di-t-butylphenol),
2,2'-thiobis (4-methyl-6-t-butylphenol), trimethyldihydroquinone, p, p'-dioctyldiphenylamine, 3,7-dioctylphenothiazine, alkylphenothiazine-1-carboxylate, phenyl-2-naphthylamine , 2,6-di-
0.2 to 5% by weight of t-butyl-2-dimethyl-p-cresol, 5-ethyl-10,10'-diphenylphenazaline, alkyl disulfide, etc .; phosphorus as an extreme pressure agent and an antiwear agent; Acid esters, phosphites,
Alkyl or aryl phosphorothionate, halogenated hydrocarbon, halogenated carboxylic acid, dialkyl or diaryl dithiophosphate metal salt, dialkyl dithiocarbamic acid metal salt, oil-soluble compound containing molybdenum sulfide, etc. 1 to 30% by weight, improved thermal stability As an agent, an epoxy compound is 0.2 to 5% by weight, and as an antifoaming agent, dimethylpolysiloxane and a metal carboxylate are used in an amount of 0.001 to 0.
The performance of the refrigerating machine oil, such as abrasion resistance, load resistance and thermal stability, can be further improved by adding an additive such as 1% by weight alone or in combination.

In this refrigerant compressor, the water management at the time of assembling the compressor can be made equal to that of the conventional CFC12 refrigerant compressor.

This refrigerator has excellent electrical insulation and hygroscopicity, and has good oil return from the compressor.

This refrigeration and air-conditioning system includes ester oil, PAG
The volume resistivity is improved as compared with oil, the hygroscopicity is reduced, and the water management can be made equivalent to that of a conventional refrigeration and air-conditioning system using a CFC12 refrigerant.

Further, in this refrigeration / air-conditioning apparatus, the water management at the time of assembling the compressor can be made equal to that of the conventional compressor for CFC12 refrigerant.

This refrigeration / air-conditioning apparatus can ensure the low-temperature fluidity of oil in the evaporator and the header, reduce the thickness of the oil film adhering to the inner wall of the evaporator, and prevent the heat exchange rate from decreasing. Apparatus cooling performance equivalent to the case where mutually soluble oil is used can be obtained.

Further, in this refrigeration / air-conditioning apparatus, the amount of refrigerant corresponding to 10 to 20% by weight of the enclosed oil amount can be reduced as compared with the case where mutually soluble oil is used.

Further, the refrigeration / air-conditioning apparatus can surely return the refrigerating machine oil to the compressor without storing a large amount of oil in the header, and at the same time, can store an excess refrigerant according to the load condition of the apparatus.

Further, the refrigerating air conditioner prevents the gas leaking from the high pressure side when the compressor is stopped from reaching the header and the evaporator through the suction pipe and increasing the temperature of the evaporator and the like. Power consumption can be reduced.

Further, this refrigerating air conditioner can prevent the capillary tube from being clogged by oil, and can constitute a highly reliable device.

[0046]

According to the present invention, the refrigerant compressor uses a liquid refrigerant mainly composed of hydrofluorocarbon as the refrigerant, and the lubricating oil of the refrigerant compressor and the liquid refrigerant have no mutual solubility and are separated into two layers. the configuration state and ing, chlorine freon can be used free, and with performance better device is obtained, since no use of oil with a mutual solubility as polyether conventional example, electrical insulation A highly reliable compressor with good hygroscopicity, easy handling, and spilled oil flowing through the squeezed portion and reliably returning can be obtained.

Since the refrigerant compressor according to the present invention uses lubricating oil having fluidity and low viscosity, even if the refrigerant flows out in large quantities, the refrigerant can be returned to the compressor without fail and reliable operation can be performed.

In this refrigerant compressor according to the third aspect, the oil viscosity at the operating ambient temperature of the device is set to 200 cSt or less, so that the piping can be prevented from being clogged by oil, and a highly reliable device can be obtained. be able to.

The refrigeration and air-conditioning system according to claim 4 uses a refrigerant mainly composed of hydrofluorocarbon as the refrigerant, and the lubricating oil has no mutual solubility with the refrigerant and has a viscosity.
Since the low construction improves the volume resistivity, hygroscopicity is reduced, easy to water management, oil return is good picolinimidate location to the compressor can be obtained even oil flows out. Furthermore, an efficient device can be obtained by the backflow prevention mechanism.

[0050] The refrigerating and air-conditioning apparatus according to claim 5, the liquid that is formed between the bottom of the upper opening of the suction pipe is inserted from below into A key <br/> Yumureta upward side accumulator Since the liquid refrigerant and the lubricating oil are stored in the sump and the refrigerant and the lubricating oil are allowed to flow from top to bottom, and a backflow prevention mechanism is provided, the electric insulation and the hygroscopicity are excellent, and the oil to the compressor is excellent. Good reproducibility and high reliability can be obtained. Also, depending on the load status of the device, excess refrigerant is
Reliable and convenient to store
A device is obtained.

[0051] The refrigerator according to claim 6, good assembly stand, handling of parts is easy, and the oil is high efficient and reliable and returning to ensure device is obtained.

In the refrigeration / air-conditioning apparatus according to the seventh aspect, the viscosity at the evaporating temperature of the apparatus is set to 2000 cSt or less, so that the low-temperature fluidity of the oil in the evaporator is ensured.
The film thickness of the oil adhering to the inner wall surface of the evaporator can be reduced to prevent a decrease in the heat exchange rate, and the same device cooling performance as in the case of using mutually soluble oil can be obtained.

In the refrigeration / air-conditioning apparatus according to the eighth aspect, the viscosity at the operating ambient temperature of the apparatus is set to 200 cSt or less, so that it is possible to prevent the piping from being clogged by oil, and to constitute a highly reliable apparatus. be able to.

Since the refrigeration and air-conditioning system according to the ninth aspect is of a high-pressure vessel type, a refrigerant corresponding to 10 to 20% by weight of the enclosed oil amount as compared with the case where mutually soluble oil is used. The amount can be reduced and an inexpensive device can be obtained. The refrigerant compressor according to claim 10 and the refrigeration according to claim 11.
In air conditioners, the specific gravity of lubricating oil is lighter than that of refrigerant.
It returns reliably and a highly reliable device is obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a refrigeration apparatus using a refrigerant compressor according to an embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between the oil viscosity of a hard alkylbenzene oil and the temperature reached by an evaporator.

FIG. 3 is a refrigerant circuit diagram of a refrigerator according to another embodiment of the present invention.

FIG. 4 is a partial detailed view of a refrigerant circuit of a refrigerator according to another embodiment of the present invention.

FIG. 5 is a configuration diagram of a refrigeration / air-conditioning apparatus according to another embodiment of the present invention.

FIG. 6 is a diagram showing a relationship between an oil return time and an oil kinematic viscosity at an operating ambient temperature of a refrigeration / air-conditioning apparatus according to another embodiment of the present invention.

FIG. 7 is a diagram showing the relationship between the oil kinematic viscosity at the freezing compartment temperature and the evaporation temperature in the refrigerating air conditioner according to another embodiment of the present invention.

FIG. 8 is a configuration diagram of a refrigeration apparatus using a conventional refrigerant compressor.

[Explanation of symbols]

Reference Signs List 1 compressor, 4 evaporator, 5 accumulator, 6 lubricating oil, 6c hard alkyl benzene oil, 6d low viscosity hard alkyl benzene oil, 7 suction pipe, 8 oil return hole, 11 sealed container, 12 electric motor, 13 insulation coated electric wire, 16 cylinder , 17 Bearing, 18 Refrigerant, 19
No oil.

Continuation of the front page (51) Int.Cl. ⁶ Identification code FI F04C 29/00 F04C 29/00 U 29/02 29/02 Z // C10N 20:02 40:30 (72) Inventor Maruyama etc. Shikaoka City Oka 3-18-1, Mitsubishi Electric Corporation Shizuoka Works (72) Inventor Noboru Masuda 3-18-1, Oka, Shizuoka City Mitsubishi Electric Corporation Shizuoka Works (72) Inventor Shinobu Ogasawara Okabara, Shizuoka City 18-1 Mitsubishi Electric Corporation Shizuoka Works (72) Inventor Yoshihiro Sumida 8-1-1, Tsukaguchi Honmachi, Amagasaki City Mitsubishi Electric Corporation Central Research Laboratory (72) Inventor Satoru Toyama, 8 Tsukaguchi Honmachi Amagasaki City No. 1 Mitsubishi Materials Corporation Materials and Devices Laboratory (56) References JP-A-5-93198 (JP, A) JP-A-59-197759 (JP, A) JP-A-63-180047 (JP, A) JP-A-61-49974 (JP, A) JP-A-1-115998 (JP, A) JP-A-3-3981 (JP, A) JP-A-4-94472 (JP, A) Showa 59-137391 (JP, U) Actually open Showa 57-104264 (JP, U) Actually open Showa 57-139165 (JP, U) Actually open Showa 58-179466 (JP, U) Actually open 1-78869 (JP) , U) Ref. Of the Refrigeration Society of Japan, 1989, “Results of Operation of Small Refrigerator Using HFC134a,” November 16, 2001, Japan Refrigeration Association, pp. 21-24, 1991 Proceedings of the Japan Refrigeration Association Academic Lecture, “Characteristics of refrigeration cycle using HFC23,” November 7, 1991, Japan Refrigeration Association, pp. 49-52, “CFCs: Time of Transaction,” 1989 Published by American Society of Heating, Refrigating, and Air-Conditioning Engineers, Inc. Pages 211-216 Edited by Refrigerant Piping Manual Editing Committee First of "New Refrigerant Piping Manual" 1987 May 1, Industry Research Council issued the first 17 pages Japan Refrigeration and Association Edit "new edition refrigeration and air conditioning Handbook Fourth Edition Fundamentals", 4th edition, 1981 May 30, Japan Refrigeration and Association issued the first 319 pages

Claims (11)

(57) [Claims] 1. A condenser, squeezing unit, is connected to the refrigerant circuit configured by connecting an evaporator in the pipe, the refrigerant compressor for circulating refrigerant back to the compressor discharge from the compressor, hydrofluorocarbons Is stored in a container of a compressor that compresses and discharges a refrigerant containing as a main component, lubricates sliding parts of the compressor, seals a compression chamber, and is discharged from the compressor to the refrigerant circuit. And lubricating oil circulating through the refrigerant circuit together with the refrigerant, the lubricating oil is in a two-layer separated state without mutual solubility with the refrigerant containing the hydrofluorocarbon as a main component in the liquid portion of the refrigerant circuit, and The lubricating oil flows through the narrow portion of the refrigerant circuit and returns to the compressor.
A refrigerant compressor having a high viscosity . 2. The refrigerant compressor according to claim 1, wherein when the lubricating oil flows out of the compressor in a large amount, the lubricating oil returns to the compressor in a predetermined time and has low fluidity. 3. put the ambient temperature using the apparatus as Jun Namerayu
2. The refrigerant compressor according to claim 1, wherein an oil having an oil viscosity of 200 cSt or less is used. 4. A composition containing a hydrofluorocarbon as a main component.
Compressor, condenser, and evaporator for circulating refrigerant
A refrigerant circuit configured to be connected thereto, and sealed in a closed vessel of the compressor to be mutually soluble with the refrigerant.
Lack of dissolvability and fluidity to return to the compressor
Lubricating oil having a low viscosity, the evaporator and the compressor
Between the compressor and the backflow of refrigerant from the compressor to the evaporator.
Refrigeration characterized by comprising a backflow prevention mechanism for stopping
Air conditioner. 5. The refrigerant circuit further comprises a backflow prevention mechanism.
An accumulator is connected between the evaporators by piping.
The accumulator has an upper side connected to an outlet side of the evaporator, and is inserted into the accumulator from a lower side to an upper side.
Suction pipe connected to the set backflow prevention mechanism
If, collision inside the accumulator of the suction pipe
Pipe opening provided at the upper position
And the lubricating oil formed between the bottom of the accumulator and
The refrigeration / air-conditioning apparatus according to claim 4, further comprising: a refrigerant reservoir for storing the refrigerant in a two-layer separated state.
Place. 6. A refrigeration and air-conditioning system according to claim 4 or 5.
Refrigerator characterized by the use of Naru. In the evaporation temperature of 7. As Jun Namerayu device,
6. The refrigeration / air-conditioning apparatus according to claim 4, wherein an oil having an oil viscosity of 2000 cSt or less is used. 8. The refrigerating and air-conditioning apparatus according to claim 4, wherein an oil having an oil viscosity of 200 cSt or less at a use ambient temperature of the apparatus is used as the lubricating oil. 9. The refrigeration / air-conditioning apparatus according to claim 4, wherein the compressor is of a high pressure vessel type. 10. The lubricating oil has a specific gravity higher than that of the refrigerant.
The refrigerant compressor according to claim 1, wherein the compressor is light. 11. The lubricating oil has a specific gravity higher than that of the refrigerant.
The refrigeration and air conditioning system according to claim 4 or 5, wherein the refrigeration system is light.
Place.