JP2006226653A - Reconditioning method for refrigerating cycle device, and refrigerating cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a replacing method for a refrigerating cycle capable of extending a service life after replacement by carrying out replacement with a compressor sealing linear alkylbenzene with little deterioration of viscosity even in a high temperature. <P>SOLUTION: By replacing a rolling piston type compressor 102a storing hard alkylbenzene of the refrigerating cycle with the rolling piston type compressor 102b sealing the linear alkylbenzene 107, the service life after replacement can be extended since the linear alkylbenzene 107 has higher viscosity in high temperature and high pressure than the hard alkylbenzene 101 in the rolling piston type compressors 102a and 102b wherein a container interior becomes a high temperature and a high pressure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for regenerating a refrigeration cycle by replacing a refrigerant compressor.

  As a refrigerating machine oil for a refrigerant compressor constituting a refrigeration cycle, there is one using hard alkylbenzene (branch type) (for example, see Patent Document 1). In such a refrigeration cycle, when air is mixed into the cycle due to leakage, or when the operation of the refrigeration cycle is stopped due to the life of the refrigerant compressor, the refrigeration cycle is regenerated by replacing the refrigerant compressor.

  In the conventional refrigeration cycle, when replacing the refrigerant compressor, it is common to re-enclose the refrigerant and oil with the same components and components as those originally encapsulated (for example, Patent Documents). 2).

  FIG. 2 is a schematic diagram of a conventional refrigeration cycle described in Patent Document 1.

  As shown in FIG. 2, the refrigeration cycle includes a refrigerant compressor 1 for compressing the refrigerant, a condenser 2 for condensing the refrigerant, an expansion mechanism 3 for expanding the refrigerant, and an evaporator for evaporating the refrigerant. The evaporator 4 is comprised, The refrigerant compressor 1, the condenser 2, the expansion mechanism 3, and the evaporator 4 are connected by piping sequentially. In addition, hard alkylbenzene 5 is stored in the refrigerant compressor 1 as oil for sliding lubrication, and R407C, for example, an HFC mixed refrigerant is enclosed as a refrigerant in the refrigeration cycle.

  In the refrigeration cycle configured as described above, a part of the hard alkylbenzene 5 stored in the refrigerant compressor 1 is discharged and circulated to the refrigeration cycle by the refrigerant.

  However, since the oil uses hard alkylbenzene 5 that is insoluble in the HFC mixed refrigerant, the amount of oil discharged and circulated into the refrigeration cycle can be reduced, resulting in a shortage of refrigeration oil in the refrigerant compressor 1. This eliminates the wear caused by the refrigeration and provides a highly reliable refrigeration cycle.

In the refrigeration cycle as described above, when air is mixed into the cycle due to leakage, or when the operation of the refrigeration cycle is stopped due to the life of the refrigerant compressor, the refrigeration cycle can be changed by replacing the refrigerant compressor. Reproduce. When performing this regeneration, in the conventional refrigeration cycle, R407C was re-encapsulated as a refrigerant, and hard alkylbenzene 5 was reencapsulated as oil.
JP 7-208819 A JP-A-6-273006

  However, in the conventional regeneration method, when the refrigerant compressor 1 is replaced, the hard alkylbenzene 5 remaining in the refrigeration cycle may be exposed to air or moisture contained in the air. In addition, if it is attempted to completely remove the hard alkylbenzene 5 deteriorating material remaining in the refrigeration cycle when the refrigerant compressor 1 is replaced, the wear powder of the refrigerant compressor 1, etc., a great deal of time is required for cleaning the refrigeration cycle. Cost.

  In general, the refrigeration cycle is often regenerated at the actual installation location. For example, vending machines are often installed indoors or in public places regardless of the road, so the vending machines are not operating. There is a strong demand for keeping the time as short as possible, and it has been difficult to sufficiently clean the inside of the refrigeration cycle.

  As a result, deteriorated refrigeration oil and compressor wear powder often remain a little, which causes a decrease in the wear resistance of the refrigerant compressor 1 and shortens the life of the refrigeration cycle apparatus. Had problems.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a replacement method that can extend the life of the refrigeration cycle by extending the life of the refrigerant compressor after replacement.

  In order to solve the above-described conventional problems, a method for replacing a refrigeration cycle apparatus according to the present invention includes a refrigeration cycle apparatus using hard alkylbenzene as a refrigeration oil, wherein the original refrigerant compressor is a refrigerant compressor in which linear alkylbenzene is enclosed. By exchanging with the refrigerant compressor, it is possible to suppress the wear of the sliding portion of the refrigerant compressor to be small by exchanging it with a refrigerant compressor in which linear alkyl benzene is sealed which has little decrease in viscosity even at high temperatures.

  According to the regeneration method of the present invention, the wear of the sliding portion of the refrigerant compressor can be kept small, so that the life of the refrigeration cycle can be extended by extending the life after replacement of the refrigerant compressor.

  The invention according to claim 1 replaces the original compressor with a refrigerant compressor in which linear alkyl benzene is sealed, based on a refrigeration cycle apparatus using hard alkyl benzene as refrigeration oil. Since the viscosity at a high temperature is higher than that of alkylbenzene and has the effect of reducing the wear of the sliding portion, the life of the refrigeration cycle after regeneration can be extended.

  In addition to the effect of the invention described in claim 1, the invention described in claim 2 further includes hard alkylbenzene remaining in the refrigeration cycle apparatus after replacement with a compressor in which linear alkylbenzene is sealed. Even in a refrigeration cycle apparatus that does not sufficiently clean the refrigeration cycle apparatus, wear of the sliding portion of the refrigerant compressor can be reduced and the life of the refrigeration cycle can be extended, so that the refrigeration cycle apparatus can be easily regenerated.

  In addition to the invention of claim 1 or claim 2, the invention described in claim 3 is a rolling piston type compressor before and after replacement, and linear alkylbenzene has a higher viscosity at a higher pressure than hard alkylbenzene. Therefore, even in a rolling piston type compressor where the inside of the compressor becomes hot during operation, the life can be extended by replacing the compressor with a linear alkylbenzene.

  The invention according to claim 4 is a refrigeration cycle apparatus regenerated by the regeneration method according to any one of claims 1 to 3, and a refrigeration cycle apparatus having a long life after regeneration can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a schematic diagram showing a refrigeration cycle regeneration method according to an embodiment of the present invention.

  In FIG. 1, the original refrigeration cycle apparatus includes a rolling piston compressor 102a in which hard alkylbenzene 101 for compressing a refrigerant is stored, a condenser 103 for heat exchange with the outside air to condense the refrigerant, A dryer 104 for removing moisture in the refrigerant discharged through the condenser 103, a decompressor 105 for decompressing the refrigerant from which moisture has been removed by the dryer 104, and the refrigerant decompressed by the decompressor 105 to the outside air The evaporator 106 for evaporating by exchanging heat with the rolling piston compressor 102a, the condenser 103, the dryer 104, the decompressor 105, and the evaporator 106 are sequentially connected by piping.

  The original refrigeration cycle apparatus is filled with a refrigerant R407C made by mixing a plurality of different refrigerants.

  Next, the regeneration method in the original refrigeration cycle configured as described above will be described.

  First, the refrigerant is extracted from a part of the refrigeration cycle. In recent years, refrigerants are usually recovered to avoid environmental destruction. Next, the rolling piston compressor 102a is removed from the refrigeration cycle by disconnecting the connection pipe (not shown) from the pipe.

  After that, conventionally, the inside of the refrigeration cycle is cleaned with a cleaning agent, and then the cleaning agent is recovered and air blown to remove the deterioration of refrigeration oil remaining in the refrigeration cycle and the wear powder of the compressor. In this embodiment, the process of cleaning the inside of the refrigeration cycle with a cleaning agent is omitted, and only air blowing is performed. As a result, the hard alkylbenzene 101 remains in the refrigeration cycle.

  Then, the rolling piston compressor 102b in which the linear alkyl benzene 107 is sealed is connected to the refrigeration cycle, and after evacuation, the same refrigerant R407C that has been sealed in the original refrigeration cycle is sealed to regenerate the refrigeration cycle. Ends.

  Next, the linear alkyl benzene 107 will be described in detail.

  The hard alkylbenzene 101 has a branched chain structure, whereas the linear alkylbenzene 107 has a linear structure. In general, the linear pressure structure has a higher laminating property and thus has a higher film pressure strength. As a result, the oil film is hardly broken at the sliding portion.

  Further, the linear alkyl benzene 107 has a lower viscosity at a high temperature than the hard alkyl benzene 101, and therefore maintains a higher viscosity than the hard alkyl benzene 101 at a high temperature.

  As described above, the film pressure strength is high and the viscosity is maintained at a high temperature, so that the internal pressure is high and the temperature tends to be high. Even in the rolling piston compressor 102b having a poor lubrication state, the sliding portion wears. Can be kept extremely small.

  Next, the water absorption of the linear alkyl benzene 107 and the hard alkyl benzene 101 will be compared. Table 1 shows the amount of water when each oil is left in the atmosphere at 30 ° C. and 95% Rh.

  As shown in (Table 1), the linear alkyl benzene 107 has a smaller water absorption than the hard alkyl benzene 101.

When water enters the refrigeration cycle, the oil hydrolyzes and deteriorates, but the linear alkylbenzene 107 has a small amount of water absorption, so that it is less likely to deteriorate even when exposed to air for the same time as the hard alkylbenzene 101. Recognize. As a result, the amount of hydrolyzed oil is reduced and the life is extended. Next, when the linear alkylbenzene 107 and the hard alkylbenzene 101 are mixed, precipitates are not generated, and this does not cause clogging of the piping of the refrigeration cycle. I confirmed.

  (Table 2) shows the state change after 14 days in a state in which hard alkylbenzene is mixed in linear alkylbenzene 107.

  From (Table 2), even if hard alkylbenzene 101 is mixed in 500,000 ppm (volume ratio) in linear alkylbenzene 107, no precipitate is observed. Therefore, it was confirmed that there is no problem even if the hard alkylbenzene 101 remains in the refrigeration cycle after replacement with a compressor in which the linear alkylbenzene 107 is sealed.

  As described above, according to the present embodiment, when the refrigeration cycle is regenerated, refrigerant is compressed from the rolling piston compressor 102a in which the hard alkylbenzene 101 is stored to the rolling piston compressor 102b in which the linear alkylbenzene 107 is sealed. By replacing the machine, even in the rolling piston compressor 102b in a poorly lubricated state, the wear of the sliding portion can be kept extremely small, the life after replacement of the refrigerant compressor can be extended, and the oil Since the amount of hydrolysis is reduced and deterioration can be suppressed, the life of the refrigeration cycle can be extended.

  In addition, since there is no problem even if hard alkylbenzene 101 is mixed in linear alkylbenzene 107, the process of cleaning the inside of the refrigeration cycle with the cleaning agent is omitted, and only the air blow is performed, thereby simplifying the regeneration process of the refrigeration cycle. be able to.

  As described above, the refrigeration cycle regeneration method according to the present invention can extend the life of the refrigeration cycle after replacement of the refrigerant compressor, so a vending machine, a refrigerator, an air conditioner, a showcase, a water heater, It can be applied to cycle replacement using a washing dryer compressor.

Schematic of the refrigeration cycle in Embodiment 1 of the present invention Schematic diagram of conventional refrigeration cycle

Explanation of symbols

101 Hard alkylbenzene 102a, 102b Rolling piston compressor 107 Linear alkylbenzene

Claims (4)

A method for regenerating a refrigeration cycle apparatus in which the original refrigerant compressor is replaced with a refrigerant compressor in which linear alkyl benzene is sealed, based on a refrigeration cycle apparatus using hard alkylbenzene as the refrigeration oil. The regeneration method for a refrigeration cycle apparatus according to claim 1, wherein the hard alkylbenzene remains in the refrigeration cycle apparatus after being replaced with a refrigerant compressor enclosing the linear alkylbenzene. The method for regenerating a refrigeration cycle apparatus according to claim 1 or 2, wherein the refrigerant compressor before and after replacement is of a rolling piston type. A refrigeration cycle apparatus regenerated by the refrigeration cycle apparatus regeneration method according to any one of claims 1 to 3.

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