JP2000274359A - Refrigerant compressor and refrigerating cycle system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the accumulation of the sludge mainly composed of oligomer in the high-temperature part of a refrigerant compressor, particularly, around a discharge valve by using, as the plastic material of the refrigerant compressor, low oligomer type polybutylene terephthalate or others. SOLUTION: The refrigerant compressed by a refrigerant compressor 1 is discharged to a condenser 3. A refrigerating machine oil 2 used for the seal of a compression chamber is also discharged with the refrigerant. The discharged refrigerating machine oil 2 is passed through the condenser 3, a capillary tube 4 and an evaporator 5 with the refrigerant, and returned to the refrigerant compressor 1. In this case, the inlet muffler 6 and motor cluster 7 of the coolant compressor 7 are molded of low oligomer type polybutylene terephthalate(PBT), or PPS or PEN. According to this, the quantity of the oligomer dissolved into the refrigerating machine oil is abut halved to solve the accumulation of the sludge mainly composed of oligomer in the high- temperature part of the refrigerant compressor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant compressor using a refrigerant mainly composed of hydrofluorocarbon as a refrigerant.

[0002]

2. Description of the Related Art Conventionally, a refrigerant compressor is disclosed in Japanese Unexamined Patent Publication No. Hei.
The one described in JP-A 61-61 is known.

FIG. 3 shows a conventional refrigeration system diagram, in which 1 is a refrigerant compressor, 2 is refrigeration oil stored in the refrigerant compressor 1, and 3 is a condenser for condensing high-pressure refrigerant gas discharged from the refrigerant compressor 1. The condenser 4 is a capillary tube, and 5 is an evaporator.

In the refrigeration system configured as described above, the refrigerant compressed by the refrigerant compressor 1 is supplied to the condenser 3
Is discharged. Further, in the refrigerant compressor 1, the refrigerating machine oil 2 used for sealing the compression chamber and the like contains the refrigerant together with the refrigerant.
Is discharged from. The discharged refrigerating machine oil 2 returns to the refrigerant compressor 1 through the condenser 3, the capillary tube 4, and the evaporator 5 together with the refrigerant.

[0005]

However, in the above-described conventional configuration, when a refrigerating machine oil that is incompatible with the refrigerant is used, unlike the case where a refrigerating machine oil that is compatible with the refrigerant is used, the conventional refrigerating machine has a disadvantage. Because the fluidity of the refrigerator oil is poor,
In order to improve the oil circulation (oil return), it is necessary to reduce the amount of refrigerating machine oil discharged from the refrigerant compressor, and since the flushing action with the refrigerating machine oil is reduced, the high temperature part of the refrigerant compressor, especially around the discharge valve, is required. There was a problem that sludge mainly composed of oligomers was deposited.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to eliminate the accumulation of sludge mainly composed of oligomers in a high-temperature portion of a refrigerant compressor, particularly around a discharge valve.

[0007]

According to the present invention, a plastic material for a refrigerant compressor is made of low oligomer type polybutylene terephthalate (PB).
T) or polyphenylene sulfide (PPS) or polyethylene naphthalate (PEN).

[0008] Thus, the amount of oligomers of plastics dissolved in the refrigerating machine oil can be reduced, and sludge mainly composed of oligomers can be prevented from accumulating in the high-temperature part of the refrigerant compressor, particularly around the discharge valve. .

[0009] Further, the oil applied to the components of the refrigerant compressor or the oil used at the time of assembling the refrigerant compressor uses oil compatible with the refrigerant.

As a result, oil that is compatible with the refrigerant is mixed into the refrigerating machine oil during operation of the refrigerant compressor, and the oil that is compatible with the refrigerant functions as a carrier that carries sludge, and the high-temperature part of the refrigerant compressor, especially It is possible to eliminate sludge accumulation mainly composed of oligomers that accumulates around the discharge valve. Further, by eliminating the accumulation of sludge mainly composed of oligomers around the high temperature part of the refrigerant compressor, particularly around the discharge valve, a more reliable refrigeration cycle system can be obtained.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The invention described in claim 1 of the present invention is directed to the use of low-oligomer type PBT or PPS or PEN as a plastics material for a refrigerant compressor. The amount of oligomer can be reduced, and it has an effect of eliminating the accumulation of sludge mainly composed of oligomer around a high temperature part of the refrigerant compressor, particularly around the discharge valve.

According to a second aspect of the present invention, an oil that is compatible with a refrigerant is used as oil applied to parts of the refrigerant compressor or oil used at the time of assembling the refrigerant compressor.
Oil that is compatible with the refrigerant is mixed into the refrigerating machine oil during operation of the refrigerant compressor, and the compatible oil acts as a carrier that carries sludge, and oligomers that accumulate around the high temperature part of the refrigerant compressor, especially around the discharge valve It has the effect of eliminating the accumulation of sludge containing as a main component.

According to a third aspect of the present invention, the refrigerant is H
In a refrigerant compressor using an FC refrigerant and a refrigerant oil incompatible with the refrigerant as the refrigerant oil, a highly reliable refrigeration cycle system is obtained by using the refrigerant compressor according to claim 1 or 2. It has the effect of doing.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same parts as those of the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) FIG. 1 is a diagram showing a refrigeration system according to one embodiment of the present invention, wherein 6 is a suction muffler, 7 is a motor cluster, and in this embodiment, a suction muffler 6 is provided. The motor cluster 7 is made of a low oligomer type PBT (for example, 1201G-1 manufactured by Toray).
5-S) or PPS or PEN.

With the above-described structure, the amount of oligomers of plastics dissolved in the refrigerating machine oil can be reduced to about 1/2 or less as compared with the conventionally used PBT material (VALOX420 manufactured by EPL), and the refrigerant compression is reduced. It is possible to eliminate the accumulation of sludge mainly composed of oligomers around the high temperature part of the machine, especially around the discharge valve.

(Embodiment 2) FIG. 2 is a sectional view of a refrigerant compressor according to one embodiment of the present invention, in which reference numeral 8 denotes an application point of application oil used at the time of assembly, and reference numeral 9 denotes a refrigerant. (Eg, HFC-134a) and an ester oil (eg, ester oil α-22E manufactured by Japan Energy) which is a coating oil compatible with HFC-134a.

With the above configuration, the refrigerant compressor 1
During operation, the ester-based oil 9 is mixed with the refrigerating machine oil 2 (for example, HAB7M, a hard alkylbenzene manufactured by Nippon Oil Co., Ltd.), and the ester-based oil component serves as a carrier for transporting sludge, and the high-temperature portion of the refrigerant compressor 1, particularly, discharge The deposition of sludge mainly composed of oligomers that accumulates around the valve can be eliminated. Specifically, when the ester oil, which is a coating oil compatible with the refrigerant, is not used (for example, when the mineral oil 1GS manufactured by Nippon San Petroleum is used), the temperature of the high temperature portion of the refrigerant compressor 1 is set to 170 ° C. Control to become
Sludge precipitates around the discharge valve in an accelerated life test of about 1000 hours. When an ester oil, which is a coating oil compatible with the refrigerant, is used as an assembly oil in an amount of about 5 cm3, a similar accelerated life test was performed. No sludge generation occurred.

[0019]

As is apparent from the above embodiment, according to the first aspect of the present invention, a refrigerant compressor using an HFC-based refrigerant as a refrigerant and using a refrigeration oil incompatible with the refrigerant as a refrigeration oil. By using low oligomer type PBT or PPS or PEN for the plastics material of the refrigerant compressor, the amount of plastics oligomers that melt into the refrigerating machine oil can be reduced, and the high-temperature part of the refrigerant compressor, especially discharge An advantageous effect of eliminating the accumulation of sludge mainly composed of oligomer around the valve can be obtained.

According to the second aspect of the present invention, by using oil compatible with the refrigerant as the oil applied to the components of the refrigerant compressor or the oil used at the time of assembling the refrigerant compressor, the operation of the refrigerant compressor can be improved. Oil that is compatible with the refrigerant mixes into the refrigerating machine oil, and the oil that is compatible with the refrigerant acts as a carrier that carries the sludge, and mainly consists of oligomers that accumulate in the high-temperature part of the refrigerant compressor, especially around the discharge valve. An advantageous effect of eliminating the accumulation of sludge is obtained.

According to a third aspect of the present invention, there is provided a refrigerant compressor using an HFC refrigerant as a refrigerant and using a refrigeration oil incompatible with the refrigerant as a refrigeration oil. The use of the refrigerant compressor has the effect of increasing the reliability of the refrigeration cycle system.

[Brief description of the drawings]

FIG. 1 is a diagram of a refrigeration system according to an embodiment of the present invention shown in claim 1;

FIG. 2 is a sectional view of a refrigerant compressor according to an embodiment of the present invention shown in FIG.

FIG. 3 is a diagram of a conventional refrigeration system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerant compressor 2 Refrigeration oil 6 Suction muffler 7 Motor cluster 8 Application place 9 Ester oil

Claims (3)

[Claims] 1. A refrigerant compressor using an HFC-based refrigerant as a refrigerant and a refrigerating machine oil having no compatibility with the refrigerant as a refrigerating machine oil, wherein the plastics material of the refrigerant compressor is a low oligomer type polybutylene terephthalate ( PBT) or polyphenylene sulfide (PP
S) or a refrigerant compressor using polyethylene naphthalate (PEN). 2. The refrigerant compressor according to claim 1, wherein oil that is compatible with the refrigerant is used as oil applied to parts of the refrigerant compressor or oil used when assembling the refrigerant compressor. 3. A refrigeration cycle system using a refrigerant compressor according to claim 1 or 2, wherein the refrigerant compressor uses an HFC refrigerant as a refrigerant and uses a refrigeration oil incompatible with the refrigerant as a refrigeration oil. .